Continuous casting tundish water gap quick-changing device and method thereof

Abstract

The invention discloses a continuous casting tundish nozzle quick-changing device and a method thereof, and belongs to the technical field of nozzle quick-changing devices. The mechanism comprises a mechanism body, a pushing device is arranged on one side of the mechanism body, the output end of the pushing device is connected with a pushing arm, a guide plate is arranged at the rear end of the pushing arm, and a pin is arranged at the front end of the pushing arm; a blind plate is arranged on the inlet side of the mechanism body, and a blind plate hook is arranged at the rear end of the blind plate. In the normal casting operation process, the blind plate is always hung on the mechanism body, automatic standby is achieved, the blind plate does not need to be manually taken and placed, when the water gap is quickly replaced, the pushing device drives the pushing arm to push a new water gap to be replaced into a working position and then automatically returns to the initial blind plate standby state, and in the process, the new water gap is automatically replaced. And in case of emergency conditions such as steel running between the plates and out-of-control of the stopper rod, the pushing device can be started again to push the blind plate to cut off the steel flow, so that the safety in the quick change process of the water gap is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of nozzle quick-change devices, and more specifically to a continuous casting tundish nozzle quick-change device and method thereof. Background Art

[0002] At present, the tundish nozzle quick-change technology has been widely used in my country's metallurgical continuous casting system. It has the advantages of greatly increasing the number of single-ladle continuous casting furnaces, improving the molten steel recovery rate and casting machine operation rate, and reducing the comparative cost per ton of steel.

[0003] At present, the technology adopted by the tundish water inlet quick-change device is: the placement and removal of the blind plate is either manually operated. If steel slips out during the water inlet quick-change process, the blind plate cannot be manually placed, which poses a safety hazard; or a separate blind plate driving mechanism is used, which makes the structure of the water inlet quick-change device complicated and the water inlet quick-change operation inconvenient. At the same time, the blind plate drive and the water inlet quick-change are not reliably interlocked, and the two actions will interfere with each other. Summary of the invention

[0004] 1. Technical problem to be solved by the invention

[0005] In view of the defects and shortcomings of the prior art, the present invention provides a continuous casting intermediate tank water inlet quick-change device and method thereof. In the normal casting operation process, the blind plate is always suspended on the mechanism body to realize automatic standby, and there is no need to manually take and place the blind plate. When the water inlet is quickly changed, the pushing device drives the pushing arm to push the new water outlet to be replaced into the working position, and then automatically returns to the initial blind plate standby state. During this process, if there are emergencies such as steel leakage between plates and loss of control of the stopper rod, the pushing device can be started again to push the blind plate in to cut off the steel flow, thereby ensuring safety during the water inlet quick-change process. Therefore, the device can ensure that the steel flow can be cut off under any circumstances, thereby ensuring production safety.

[0006] 2. Technical solution

[0007] In order to achieve the above object, the technical solution provided by the present invention is:

[0008] A continuous casting tundish nozzle quick-change device of the present invention comprises a mechanism body,

[0009] A pushing device is provided on one side of the mechanism body, the output end of the pushing device is connected to a pushing arm, a guide plate is provided at the rear end of the pushing arm, a profile opening slot is provided at the front end of the pushing arm, and a pin is provided in the profile opening slot;

[0010] The guide plate is provided with a straight line guide groove 1, an oblique line guide groove 2 and a straight line guide groove 3;

[0011] The inlet side of the mechanism body is provided with a blind plate, the rear end of the blind plate is provided with a blind plate hook, and the front ends of the blind plate are symmetrically provided with groove 1, an opening groove inclined upward, groove 2 and groove 3 on both sides;

[0012] The inlet side of the mechanism body is also provided with a front pin and a rear pin, and two groups of the front pin and the rear pin are arranged at intervals and are respectively located on both sides of the blind plate.

[0013] Furthermore, a groove is provided in the center of the mechanism body, an upper water inlet is placed in the groove, and a lower water inlet is provided at the lower part of the mechanism body, and the lower water inlet includes an original lower water inlet and a new lower water inlet.

[0014] Furthermore, a cover plate is provided at the upper end of the mechanism body, an inclined groove is provided on the bottom side of the cover plate, an inclined wedge is inserted into the inclined groove on the bottom side of the cover plate to fix the water inlet.

[0015] Furthermore, a tightening device is provided on the inlet side of the mechanism body, and the tightening device includes a tightening spring and a push rod.

[0016] Furthermore, pressure adjusting devices are provided on both sides of the lower part of the mechanism body, and the pressure adjusting devices include a spring box and a pressure adjusting seat;

[0017] The spring box is provided with a spring inside, a transition block is provided at one end of the spring, and a pressure sensor is provided at one side of the transition block; the transition block transmits the pressure of the spring to the pressure sensor for transmission and reading;

[0018] The other end of the spring is provided with a guide rod, and the front end of the guide rod is provided with an L-shaped push rod;

[0019] The spring box is provided with a shaft, and the L-shaped ejector rod rotates relative to the shaft;

[0020] The front end of the L-shaped push rod is provided with a push block, and the push block supports the lower sliding surface of the drain outlet;

[0021] The pressure of the spring is transmitted to the drain port through the guide rod, the L-shaped ejector rod and the ejector block, so that the upper surface of the drain port is closely fitted with the lower surface of the upper water port.

[0022] Furthermore, a heat insulation board is provided at the bottom of the spring box; a plurality of groups of L-shaped top rods are provided at one end of the spring box near the drain;

[0023] The upper surface of the top block is designed to be straight in the middle and transitional with arc slopes on both sides.

[0024] Furthermore, a pressure adjustment seat is provided on the side of the spring box away from the drain port, a worm wheel is provided inside the pressure adjustment seat, the outer ring of the worm wheel is meshed with the worm, the outer ring of the worm wheel is threadedly matched with the adjusting rod, and an anti-rotation pin is inserted on the rod body of the adjusting rod;

[0025] The rotating worm drives the worm wheel to rotate, and the anti-rotation pin prevents the adjustment rod matched with the worm wheel thread from rotating with the worm wheel, but makes a linear motion toward the center of the mechanism body.

[0026] A method for quickly changing a nozzle of a continuous casting tundish, in an initial state;

[0027] The push arm is located at a guide groove of the straight section of the guide plate. One end of the blind plate is hung on the pin at the front end of the push arm through a blind plate hook, and the other end of the blind plate is hung on the front pin through grooves on both sides. Under the action of the tightening spring, the push rod tightens the blind plate to maintain stability; the original water outlet is in the working position for normal casting operation.

[0028] Furthermore, during the nozzle quick change process:

[0029] The new drain port is placed at the inlet preparation position of the mechanism body, with its upper surface in contact with the bottom of the blind plate;

[0030] The push arm first moves forward in a straight line along the straight section guide groove of the guide plate, and the pin on the push arm pushes the blind plate hook to drive the blind plate to move forward;

[0031] Since the upper surface of the new drain port supports the bottom of the blind plate, the blind plate will move forward linearly until the groove 3 is hung on the rear pin and the groove 1 is hung on the front pin; at this time, the push arm moves downward along the oblique guide groove 2, and the pin is separated from the blind plate hook;

[0032] Then, the push arm moves forward linearly along the straight section guide groove 3, pushing the new drain port located at the preparation position out of the original drain port and into the working position;

[0033] After the water inlet is replaced, the push arm moves backward along the straight section guide groove three, then moves upward along the guide groove two, the blind plate hook is hung on the pin again, and finally the push arm moves backward along the straight section guide groove one, the pin pulls the blind plate hook to drive the blind plate back to the initial state during normal casting operation.

[0034] Furthermore, during normal casting operation, if the device needs to close the water outlet in an emergency, or the process of closing the water outlet with a blind plate at the end of the casting operation is as follows:

[0035] The push arm first moves forward in a straight line along the straight section guide groove 1 of the guide plate, and the pin on the push arm pushes the blind plate hook to drive the blind plate to move forward. When the supporting point of the front pin and the blind plate changes from the groove 1 to the intersection of the obliquely upward opening groove, since there is no support of the water outlet to be replaced at the bottom of the blind plate, under the action of the blind plate's own gravity, the front end of the blind plate slides obliquely downward along the opening groove along the front pin, and finally separates from the front pin and slides into the entrance preparation position of the mechanism body;

[0036] When the push arm moves downward along the oblique guide groove 2, the blind plate hook at the rear end of the blind plate also slides into the entrance preparation position of the mechanism body along with the pin; at this point, the blind plate as a whole slides into the entrance preparation position of the mechanism body, and then the push arm moves forward along the straight guide groove 3 to push the blind plate at the preparation position out of the original outlet and into the working position to close the outlet and cut off the steel flow;

[0037] This position pin is located in the empty space at the lower end of the blind plate hook and is disengaged from the blind plate hook;

[0038] The push arm is retracted backwards, along the straight line guide groove three, the oblique line guide groove two and finally enters the straight line guide groove one to return to the initial position.

[0039] 3. Beneficial effects

[0040] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0041] In the normal casting operation process of the present invention, the blind plate is always suspended on the mechanism body to realize automatic standby, and there is no need to manually take and place the blind plate. When the water nozzle is quickly changed, the pushing device drives the pushing arm to push the new water nozzle to be replaced into the working position, and then automatically returns to the initial blind plate standby state. During this process, if an emergency situation such as steel leakage between plates or loss of control of the stopper rod occurs, the pushing device can be started again to push the blind plate in to cut off the steel flow, thereby ensuring the safety during the water nozzle quick change process. Therefore, the device can ensure that the steel flow can be cut off under any circumstances, thereby ensuring production safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a top view of the overall structure of the present invention;

[0043] Figure 2 It is a left side cross-sectional view of the present invention;

[0044] Figure 3 It is a front view of the guide plate of the present invention;

[0045] Figure 4 It is a front view of the blind plate of the present invention;

[0046] Figure 5 This is an initial state diagram of the normal pouring operation of the present invention;

[0047] Figure 6 A state diagram of a new drain port of the present invention being placed in a ready position;

[0048] Figure 7 A state diagram of the new drain port of the present invention being placed in a working position;

[0049] Figure 8 This is a state diagram of the blind plate closing the water outlet of the present invention;

[0050] Fig. 9 It is a partial structural diagram of the L-shaped top rod of the present invention;

[0051] Fig.10 It is a partial assembly diagram of the pushing device of the present invention;

[0052] Fig.11 It is a partial front view of the pushing device of the present invention;

[0053] Fig.12 The blind plate of the present invention is three-dimensional Figure 1 ;

[0054] Fig.13 The blind plate of the present invention is three-dimensional Figure 2 ;

[0055] Fig.14 The blind plate of the present invention is three-dimensional Figure 3 ;

[0056] Fig.15 A top view of a blind plate of the present invention;

[0057] Fig.16 It is a partial assembly diagram of the pushing device of the present invention;

[0058] Fig.17 It is an assembly diagram of the internal structure of the pressure adjustment seat of the present invention.

[0059] In the figure: 1, mechanism body; 2, cover plate; 3, oblique wedge; 4, pushing device; 5, push arm; 501, U-shaped opening groove; 6, guide plate; 601, straight line segment guide groove 1; 602, oblique line segment guide groove 2; 603, straight line segment guide groove 3; 7, pin; 8, blind plate; 801, blind plate hook; 802, groove 1; 803, opening groove; 804, groove 2; 805, groove 3; 9, tightening device; 901, tightening spring; 90 2. Push rod; 1001. Front pin; 1002. Rear pin; 11. Spring box; 12. Pressure adjustment seat; 13. Water outlet; 13a. New water outlet; 13b. Original water outlet; 14. Water inlet; 15. Heat insulation board; 16. Shaft; 17. L-shaped push rod; 171. Push block; 18. Guide rod; 19. Spring; 20. Transition block; 21. Pressure sensor; 22. Worm; 23. Worm wheel; 24. Adjustment; 25. Anti-rotation pin. DETAILED DESCRIPTION

[0060] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0061] Example 1

[0062] from Figure 1-15 It can be seen that a continuous casting tundish nozzle quick-change device of this embodiment includes a mechanism body 1;

[0063] from Figure 1-2 It can be seen that a pushing device 4 is provided on one side of the mechanism body 1, a pushing arm 5 is connected to the output end of the pushing device 4, a guide plate 6 is provided at the rear end of the pushing arm 5, a U-shaped opening groove 501 is provided at the front end of the pushing arm 5, and a pin 7 is provided in the U-shaped opening groove 501;

[0064] from Figure 3 It can be seen that the guide plate 6 is provided with a straight line guide groove 1 601, an oblique line guide groove 2 602 and a straight line guide groove 3 603;

[0065] from Figure 1 , Figure 4 , Figure 12-15 It can be seen that a blind plate 8 is provided on the inlet side of the mechanism body 1, a blind plate hook 801 is provided at the rear end of the blind plate 8, and groove 1 802, an upwardly inclined opening groove 803, groove 2 804 and groove 3 805 are symmetrically provided on both sides of the front end of the blind plate 8.

[0066] The inlet side of the mechanism body 1 is also provided with a front pin 1001 and a rear pin 1002. Two groups of the front pin 1001 and the rear pin 1002 are arranged at intervals and are respectively located on both sides of the blind plate 8;

[0067] A groove is provided in the center of the mechanism body 1, and an upper water inlet 14 is placed in the groove. A lower water inlet 13 is provided at the lower part of the mechanism body 1, and the lower water inlet 13 includes an original lower water inlet 13b and a new lower water inlet 13a.

[0068] A cover plate 2 is provided at the upper end of the mechanism body 1 , and an inclined groove is provided on the bottom side of the cover plate 2 , in which an inclined wedge 3 is inserted. The inclined wedge 3 is inserted into the inclined groove on the bottom side of the cover plate 2 to fix the water inlet 14 .

[0069] A tightening device 9 is provided on the inlet side of the mechanism body 1 , and the tightening device 9 includes a tightening spring 901 and a push rod 902 .

[0070] Example 2

[0071] from Figure 5-8 It can be seen that a method for quick-changing nozzles of continuous casting intermediate tanks is Figure 5 It can be seen that: in the initial state;

[0072] The push arm 5 is located at the straight section guide groove 1 601 of the guide plate 6, one end of the blind plate 8 is hung on the pin 7 at the front end of the push arm 5 through the blind plate hook 801, and the other end of the blind plate 8 is hung on the front pin 1001 through the grooves 2 804 on both sides. Under the action of the tightening spring 901, the push rod 902 tightens the blind plate 8 to maintain stability; the original water outlet 13b is in the working position for normal casting operation.

[0073] from Figure 6-7It can be seen that during the quick change of the nozzle:

[0074] The new drain port 13a is placed at the inlet preparation position of the mechanism body 1, and its upper surface contacts the bottom of the blind plate 8, as shown in FIG. Figure 6 As shown;

[0075] The push arm 5 first moves forward in a straight line along the straight section guide groove 601 of the guide plate 6, and the pin 7 on the push arm 5 pushes the blind plate hook 801 to drive the blind plate 8 to move forward;

[0076] Since the upper surface of the new drain port 13a holds the bottom of the blind plate 8, the blind plate 8 will continue to move forward in a straight line until the groove 3 805 is hung on the rear pin 1002 and the groove 1 802 is hung on the front pin 1001; at this time, the push arm 5 moves downward along the oblique line guide groove 2 602, and the pin 7 is separated from the blind plate hook 801;

[0077] Subsequently, the push arm 5 moves forward in a straight line along the straight line guide groove 3 603, pushing the new drain port 13a at the preparation position out of the original drain port 13b and into the working position. Figure 7 As shown;

[0078] After the water inlet is replaced, the push arm 5 moves backward in a straight line along the straight section guide groove three 603, and then moves upward in an oblique line along the guide groove two 602, and the blind plate hook 801 is re-hung on the pin 7. Finally, the push arm 5 moves backward in a straight line along the straight section guide groove one 601, and the pin 7 pulls the blind plate hook 801 to drive the blind plate 8 to return to the initial state during normal casting operation.

[0079] from Figure 8 It can be seen that during normal casting operation, if the device needs to close the water outlet in an emergency, or the process of closing the water outlet with the blind plate 8 at the end of the casting operation is as follows:

[0080] The push arm 5 first moves forward in a straight line along the straight section guide groove 1 601 of the guide plate 6, and the pin 7 on the push arm 5 pushes the blind plate hook 801 to drive the blind plate 8 to move forward. When the supporting point of the front pin 1001 and the blind plate 8 changes from the groove 1 802 to the intersection of the obliquely upward opening groove 803, since there is no support of the water outlet to be replaced at the bottom of the blind plate 8, under the action of the blind plate 8's own gravity, the front end of the blind plate 8 slides obliquely downward along the opening groove 803 along the front pin 1001, and finally separates from the front pin 1001 and slides into the entrance preparation position of the mechanism body 1;

[0081] During the downward oblique movement of the push arm 5 along the oblique guide groove 602, the blind plate hook 801 at the rear end of the blind plate 8 also slides into the entrance preparation position of the mechanism body 1 along with the pin 7; at this point, the blind plate 8 as a whole slides into the entrance preparation position of the mechanism body 1, and then the push arm 5 moves forward in a straight line along the straight guide groove 603, pushing the blind plate 8 at the preparation position out of the original water outlet 13b into the working position to close the water outlet and cut off the steel flow. Figure 8 As shown;

[0082] This position pin 7 is located in the gap at the lower end of the blind plate hook 801 and is disengaged from the blind plate hook 801;

[0083] The push arm 5 is retracted backwards, along the straight segment guide groove 3 603, the oblique segment guide groove 2 602 and finally enters the straight segment guide groove 1 601 to return to the initial position.

[0084] To sum up, during the normal casting operation, the device always hangs the blind plate 8 on the mechanism body 1 to achieve automatic standby, without the need for manual placement of the blind plate 8. When the water inlet is quickly changed, the pushing device 4 drives the pushing arm 5 to push the new water outlet 13a to be replaced into the working position, and then automatically returns to the initial standby state of the blind plate 8. During this process, if there are emergencies such as steel running between plates and the stopper rod losing control, the pushing device 4 can be started again to push the blind plate 8 in to cut off the steel flow, thereby ensuring safety during the water inlet quick change process. Therefore, the device can ensure that the steel flow can be cut off under any circumstances to ensure production safety.

[0085] Example 3

[0086] from Figure 2 , Figure 16-17 It can be seen that a continuous casting tundish nozzle quick-change device of this embodiment includes a mechanism body 1;

[0087] Both sides of the lower part of the mechanism body 1 are provided with a pressure tightening device, which includes a spring box 11 and a pressure adjusting seat 12;

[0088] A spring 19 is arranged inside the spring box 11, a transition block 20 is arranged at one end of the spring 19, and a pressure sensor 21 is arranged at one side of the transition block 20; the transition block 20 transmits the pressure of the spring 19 to the pressure sensor 21 for transmission and reading;

[0089] The other end of the spring 19 is provided with a guide rod 18, and the front end of the guide rod 18 is provided with an L-shaped push rod 17;

[0090] A shaft 16 is disposed in the spring box 11, and an L-shaped ejector rod 17 rotates relative to the shaft 16;

[0091] from Fig. 9It can be seen that a top block 171 is provided at the front end of the L-shaped top rod 17, and the top block 171 supports the lower sliding surface of the drain port 13;

[0092] The pressure of the spring 19 is transmitted to the lower water port 13 through the guide rod 18 , the L-shaped push rod 17 , and the push block 171 , so that the upper surface of the lower water port 13 and the lower surface of the upper water port 14 are kept in close contact.

[0093] A heat insulation board 15 is provided at the bottom of the spring box 11; a plurality of groups of L-shaped push rods 17 are provided at one end of the spring box 11 near the drain 13;

[0094] from Fig. 9 It can be seen that the upper surface of the top block 171 is designed with a straight middle portion and arc-shaped inclined transitions on both sides, so that the water outlet 13 can slide smoothly and reliably from the working position of the mechanism body 1 into the working position of normal casting, or be ejected from the working position of normal casting.

[0095] A pressure adjustment seat 12 is provided on one side of the spring box 11 away from the drain port 13. A worm gear 23 is provided inside the pressure adjustment seat 12. The outer ring of the worm gear 23 meshes with the worm 22. The outer ring of the worm gear 23 is threadedly matched with the adjustment rod 24. An anti-rotation pin 25 is inserted on the rod body of the adjustment rod 24.

[0096] The adjustment method is as follows: the worm 22 is rotated to drive the worm wheel 23 to rotate, and the anti-rotation pin 25 makes the adjustment rod 24 which is threadedly matched with the worm wheel 23 not rotate with the worm wheel 23, but makes a linear motion toward the center direction of the mechanism body 1;

[0097] The tightening force of the adjusting rod 24 is transmitted to the spring 19 through the pressure sensor 21 and the transition block 20, so that the compression amount of the spring 19 gradually increases, and the pressure also gradually increases. When the pressure value transmitted by the pressure sensor 21 reaches the designed working pressure of the spring 19, the adjustment is stopped;

[0098] The worm gear drive adjustment method is adopted to make the compression amount of the spring 19 change slightly and controllable, and the pressure adjustment accuracy is higher.

[0099] During normal casting operation, the device can set a pressure alarm safety value. When the pressure sensor 21 detects that the pressure value of the spring 19 drops below the pressure alarm safety value, an alarm indication is provided to remind the operator to take corresponding measures in time to prevent air absorption and oxidation steel penetration between plates during casting operations under low spring pressure.

[0100] The present invention and its embodiments are described schematically above, and the description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by it and designs a structural method and an embodiment similar to the technical solution without creativity without departing from the purpose of the invention, they shall all fall within the protection scope of the present invention.

Claims

1. A continuous casting tundish nozzle quick-change device, comprising a mechanism body (1), characterized in that: A pushing device (4) is provided on one side of the mechanism body (1); the output end of the pushing device (4) is connected to a pushing arm (5); a guide plate (6) is provided at the rear end of the pushing arm (5); a U-shaped opening groove (501) is provided at the front end of the pushing arm (5); and a pin (7) is provided in the U-shaped opening groove (501); The guide plate (6) is provided with a straight line guide groove 1 (601), an oblique line guide groove 2 (602) and a straight line guide groove 3 (603); A blind plate (8) is provided at the inlet side of the mechanism body (1), a blind plate hook (801) is provided at the rear end of the blind plate (8), and groove 1 (802), an opening groove (803) inclined upward, groove 2 (804) and groove 3 (805) are symmetrically provided on both sides of the front end of the blind plate (8); The inlet side of the mechanism body (1) is also provided with a front pin (1001) and a rear pin (1002), and two groups of the front pin (1001) and the rear pin (1002) are arranged at intervals and are respectively located on both sides of the blind plate (8).

2. The continuous casting tundish nozzle quick-change device according to claim 1, characterized in that: A groove is provided in the center of the mechanism body (1), an upper water inlet (14) is placed in the groove, a lower water inlet (13) is provided at the bottom of the mechanism body (1), and the lower water inlet (13) includes an original lower water inlet (13b) and a new lower water inlet (13a).

3. The continuous casting tundish nozzle quick-change device according to claim 2, characterized in that: The upper end of the mechanism body (1) is provided with a cover plate (2), the bottom side of the cover plate (2) is provided with an inclined groove, an inclined wedge (3) is inserted into the inclined groove, and the inclined wedge (3) is inserted into the inclined groove on the bottom side of the cover plate (2) to fix the water inlet (14).

4. The continuous casting tundish nozzle quick-change device according to claim 3, characterized in that: A tightening device (9) is provided on the inlet side of the mechanism body (1), and the tightening device (9) comprises a tightening spring (901) and a push rod (902).

5. The continuous casting tundish nozzle quick-change device according to claim 1, characterized in that: Both sides of the lower part of the mechanism body (1) are provided with pressure adjustment devices, which include a spring box (11) and a pressure adjustment seat (12); The spring box (11) is provided with a spring (19) inside, a transition block (20) is provided at one end of the spring (19), and a pressure sensor (21) is provided at one side of the transition block (20); the transition block (20) transmits the pressure of the spring (19) to the pressure sensor (21) for transmission and reading; The other end of the spring (19) is provided with a guide rod (18), and the front end of the guide rod (18) is provided with an L-shaped push rod (17); The spring box (11) is provided with a shaft (16), and the L-shaped push rod (17) rotates relative to the shaft (16); The front end of the L-shaped push rod (17) is provided with a push block (171), and the push block (171) supports the lower sliding surface of the water outlet (13); The pressure of the spring (19) is transmitted to the lower water port (13) through the guide rod (18), the L-shaped push rod (17) and the push block (171), so that the upper surface of the lower water port (13) and the lower surface of the upper water port (14) are kept in close contact.

6. A continuous casting tundish nozzle quick-change device according to claim 5, characterized in that: The bottom of the spring box (11) is provided with a heat insulation board (15); one end of the spring box (11) adjacent to the drain (13) is provided with a plurality of groups of L-shaped push rods (17); The upper surface of the top block (171) is designed to be straight in the middle and transitional with arc slopes on both sides.

7. A continuous casting tundish nozzle quick-change device according to claim 6, characterized in that: A pressure adjustment seat (12) is arranged on the side of the spring box (11) away from the water outlet (13), a worm wheel (23) is arranged inside the pressure adjustment seat (12), the outer ring of the worm wheel (23) is meshed with the worm (22), the outer ring of the worm wheel (23) is threadedly matched with the adjustment rod (24), and an anti-rotation pin (25) is inserted on the rod body of the adjustment rod (24); The rotating worm (22) drives the worm wheel (23) to rotate, and the anti-rotation pin (25) prevents the adjustment rod (24) threadedly matched with the worm wheel (23) from rotating with the worm wheel (23), but makes a linear motion toward the center of the mechanism body (1).

8. The method for quick-changing nozzle of continuous casting tundish according to claim 4, characterized in that: In the initial state; The push arm (5) is located at the straight section guide groove 1 (601) of the guide plate (6); one end of the blind plate (8) is hung on the pin (7) at the front end of the push arm (5) through the blind plate hook (801); the other end of the blind plate (8) is hung on the front pin (1001) through the grooves 2 (804) on both sides; under the action of the tightening spring (901), the push rod (902) tightens the blind plate (8) to maintain stability; the original water outlet (13b) is in the working position for normal casting operation.

9. The method for quick-changing nozzle of continuous casting tundish according to claim 8, characterized in that: During the quick change of nozzle: The new water outlet (13a) is placed at the inlet preparation position of the mechanism body (1), and its upper surface contacts the bottom of the blind plate (8); The push arm (5) first moves forward in a straight line along the straight section guide groove (601) of the guide plate (6), and the pin (7) on the push arm (5) pushes the blind plate hook (801) to drive the blind plate (8) to move forward; Since the upper surface of the new drain port (13a) supports the bottom of the blind plate (8), the blind plate (8) will continue to move forward in a straight line until the groove three (805) is hung on the rear pin (1002) and the groove one (802) is hung on the front pin (1001); at this time, the push arm (5) moves downward along the oblique line guide groove two (602), and the pin (7) is separated from the blind plate hook (801); Subsequently, the push arm (5) moves forward in a straight line along the straight section guide groove 3 (603), pushing the new water outlet (13a) located at the preparation position out of the original water outlet (13b) and into the working position; After the nozzle is replaced, the push arm (5) moves backward along the straight section guide groove three (603), then moves upward along the guide groove two (602), and the blind plate hook (801) is hung on the pin (7) again. Finally, the push arm (5) moves backward along the straight section guide groove one (601), and the pin (7) pulls the blind plate hook (801) to drive the blind plate (8) back to the initial state during normal casting operation.

10. The method for quick-changing nozzle of continuous casting tundish according to claim 9, characterized in that: When the device is in normal casting operation, if an emergency situation requires closing the water outlet, or when the casting operation is completed, the process of closing the water outlet with a blind plate (8) is as follows: The push arm (5) first moves forward in a straight line along the straight section guide groove 1 (601) of the guide plate (6), and the pin (7) on the push arm (5) pushes the blind plate hook (801) to drive the blind plate (8) to move forward. When the supporting point of the front pin (1001) and the blind plate (8) changes from the groove 1 (802) to the intersection of the obliquely upward opening groove (803), since there is no support of the water outlet to be replaced at the bottom of the blind plate (8), under the action of the blind plate (8)'s own gravity, the front end of the blind plate (8) slides obliquely downward along the opening groove (803) along the front pin (1001), and finally separates from the front pin (1001) and slides into the entrance preparation position of the mechanism body (1); When the push arm (5) moves downward along the oblique guide groove (602), the blind plate hook (801) at the rear end of the blind plate (8) also slides into the entrance preparation position of the mechanism body (1) along with the pin (7); at this point, the blind plate (8) as a whole slides into the entrance preparation position of the mechanism body (1), and then the push arm (5) moves forward along the straight guide groove (603) to push the blind plate (8) at the preparation position out of the original water outlet (13b) and into the working position to close the water outlet, thereby cutting off the steel flow; The position pin (7) is located at the gap at the lower end of the blind plate hook (801) and is disengaged from the blind plate hook (801); The push arm (5) is retracted backwards, along the straight line guide groove three (603), the oblique line guide groove two (602) and finally enters the straight line guide groove one (601) to return to the initial position.

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