Hydraulic control system for sliding nozzle of tundish of continuous casting machine

Abstract

The invention discloses a hydraulic control system for a sliding gate of a tundish of a continuous casting machine, which relates to the technical field of hydraulic control systems and comprises an energy accumulator safety system and two oil cylinder control systems which are connected in parallel between an oil inlet main path and an oil return main path, the oil inlet main path is connected with an oil pump through a one-way valve; the energy accumulator safety system comprises an energy accumulator, a normally-open type high-pressure ball valve and an energy accumulator safety valve. The oil cylinder control oil way comprises a two-position four-way electromagnetic directional valve, a stacked type double-one-way throttle valve, a stacked type hydraulic control one-way valve, a first normally-closed type two-position two-way electromagnetic directional valve, a second normally-closed type two-position two-way electromagnetic directional valve and an oil cylinder. The hydraulic cylinder of the sliding nozzle can be stably controlled, and the energy accumulator safety system is arranged, so that the sliding nozzle can still be opened and closed for two to three times when an oil pump pauses in a sudden power failure state, and molten steel is prevented from being cooled and solidified.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic control systems, and in particular to a hydraulic control system for a sliding nozzle of a tundish of a continuous casting machine. Background Art

[0002] Continuous casting machines are indispensable key equipment in modern industry. Continuous casting machines are applicable to many industries and fields such as the steel industry, automobile industry, aerospace, nuclear power plants, and rare metal production. The sliding nozzle is one of the key equipment for continuous casting. The sliding nozzle is a structure installed at the bottom of the tundish. Molten steel enters the crystallizer through the nozzle. The sliding nozzle can be opened and closed at any time to control the steel temperature and regulate the steel flow, thus maintaining the safety of the equipment and operators. At present, the hydraulic control system for the sliding nozzle of the tundish of the continuous casting machine at home and abroad has the following main problems: the sliding nozzle hydraulic cylinder only has an electric operation mode. In the event of a sudden power outage, the sliding nozzle hydraulic cylinder will stop working, causing the molten steel to cool and solidify. Summary of the invention

[0003] The object of the present invention is to provide a hydraulic control system for the sliding water nozzle of the tundish of a continuous casting machine to solve the problems existing in the above-mentioned prior art. It can stably control the sliding water nozzle hydraulic cylinder, and by setting up an accumulator safety system, it can ensure that in the event of a sudden power outage, the sliding water nozzle can still be opened and closed two or three times when the oil pump of the system stops working, thereby preventing the molten steel from cooling and solidifying.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] The present invention provides a hydraulic control system for a sliding water nozzle of a tundish of a continuous casting machine, comprising an accumulator safety system and two oil cylinder control systems connected in parallel between an oil inlet main path and an oil return main path; the oil inlet main path is connected to an oil pump through a one-way valve, and the oil return main path is connected to an oil tank;

[0006] The accumulator safety system comprises an accumulator, a normally open high-pressure ball valve and an accumulator safety valve, one end of the normally open high-pressure ball valve is connected to the oil inlet main line, the other end is connected to the accumulator and the inlet end of the accumulator safety valve, and the outlet end of the accumulator safety valve is connected to the oil return main line;

[0007] The oil cylinder control oil circuit includes a two-position four-way electromagnetic reversing valve, a superimposed double one-way throttle valve, a superimposed hydraulic control one-way valve, a first normally closed two-position two-way electromagnetic reversing valve, a second normally closed two-position two-way electromagnetic reversing valve and an oil cylinder;

[0008] When the two-position four-way electromagnetic reversing valve is in the neutral state, the P port is cut off, and the T port is connected with the A port and the B port; when the b end of the two-position four-way electromagnetic reversing valve is energized, the P port is connected with the A port, and the T port is connected with the B port; when the a end of the two-position four-way electromagnetic reversing valve is energized, the P port is connected with the B port, and the T port is connected with the A port;

[0009] The P port of the two-position four-way electromagnetic reversing valve is connected to the main oil inlet route, the T port is connected to the main oil return route, the A port is connected to one end of the one-way throttle valve at the a-end of the superimposed double one-way throttle valve, and the B port is connected to one end of the one-way throttle valve at the b-end of the superimposed double one-way throttle valve; the other end of the one-way throttle valve at the a-end of the superimposed double one-way throttle valve is connected to one end of the hydraulically controlled one-way valve at the a-end of the superimposed hydraulically controlled one-way valve, and the other end of the one-way throttle valve at the b-end of the superimposed double one-way throttle valve is connected to the superimposed hydraulically controlled one-way valve. One end of the hydraulically controlled one-way valve at the B end of the superimposed hydraulically controlled one-way valve; the other end of the hydraulically controlled one-way valve at the A end of the superimposed hydraulically controlled one-way valve is connected to the rodless chamber of the cylinder, and the other end of the hydraulically controlled one-way valve at the B end of the superimposed hydraulically controlled one-way valve is connected to the rod chamber of the cylinder; one end of the first normally closed two-position two-way solenoid reversing valve is connected to the oil inlet main line, and the other end is connected to the rodless chamber of the cylinder; one end of the second normally closed two-position two-way solenoid reversing valve is connected to the rod chamber of the cylinder, and the other end is connected to the oil return main line.

[0010] Preferably, the accumulator safety system further comprises a normally closed high-pressure ball valve, one end of which is connected to the accumulator, and the other end of which is connected to the main oil return line.

[0011] Compared with the prior art, the present invention has achieved the following technical effects:

[0012] The hydraulic control system for the sliding water nozzle of the continuous casting machine tundish provided by the present invention can achieve the purpose of stable control of the sliding water nozzle hydraulic cylinder (cylinder) by connecting two cylinder control systems in parallel between the main oil inlet path and the main oil return path, and by setting up an accumulator safety system, it can ensure that in the event of a sudden power outage, when the system's oil pump stops, the accumulator can continue to provide power to the sliding water nozzle hydraulic cylinder, so that the sliding water nozzle can still be opened and closed two or three times, thereby preventing the molten steel from cooling and solidifying. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0014] Figure 1It is a schematic diagram of the hydraulic control system of the sliding nozzle of the tundish of the continuous casting machine in an embodiment of the present invention.

[0015] In the figure: 1-two-position four-way solenoid reversing valve, 2-superimposed double one-way throttle valve, 3-superimposed hydraulically controlled one-way valve, 4-first normally closed two-position two-way solenoid reversing valve, 5-second normally closed two-position two-way solenoid reversing valve, 6-one-way valve, 7-normally open high-pressure ball valve, 8-normally closed high-pressure ball valve, 9-accumulator safety valve, 10-accumulator, 11-oil cylinder, 12-main oil inlet, 13-main oil return, 14-oil tank. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] The purpose of the present invention is to provide a hydraulic control system for the sliding water nozzle of the tundish of a continuous casting machine to solve the problems existing in the prior art. It can stably control the sliding water nozzle hydraulic cylinder, and by setting up an accumulator safety system, it can ensure that in the event of a sudden power outage, the sliding water nozzle can still be opened and closed two or three times when the oil pump of the system stops working, thereby preventing the molten steel from cooling and solidifying.

[0018] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] like Figure 1 As shown, this embodiment provides a hydraulic control system for a sliding water nozzle of a tundish of a continuous casting machine, including an accumulator safety system and two oil cylinder control systems connected in parallel between an oil inlet main path 12 and an oil return main path 13; the oil inlet main path 12 is connected to an oil pump through a one-way valve 6, and the oil return main path 13 is connected to an oil tank 14;

[0020] The accumulator safety system includes an accumulator 10, a normally open high-pressure ball valve 7 and an accumulator safety valve 9. One end of the normally open high-pressure ball valve 7 is connected to the main oil inlet path 12, and the other end is connected to the accumulator 10 and the inlet end of the accumulator safety valve 9. The outlet end of the accumulator safety valve 9 is connected to the main oil return path 13. The accumulator safety system also includes a normally closed high-pressure ball valve 8. One end of the normally closed high-pressure ball valve 8 is connected to the accumulator 10, and the other end is connected to the main oil return path 13.

[0021] The oil cylinder control oil circuit includes a two-position four-way solenoid reversing valve 1, a superimposed double one-way throttle valve 2, a superimposed hydraulic one-way valve 3, a first normally closed two-position two-way solenoid reversing valve 4, a second normally closed two-position two-way solenoid reversing valve 5 and an oil cylinder 11; wherein the first normally closed two-position two-way solenoid reversing valve 4 and the second normally closed two-position two-way solenoid reversing valve 5 are normally closed two-position two-way seat valve type solenoid reversing valves;

[0022] When the two-position four-way solenoid reversing valve 1 is in the middle position, the P port is cut off, and the T port is connected with the A port and the B port; when the b end of the two-position four-way solenoid reversing valve 1 is energized, the P port is connected with the A port, and the T port is connected with the B port; when the a end of the two-position four-way solenoid reversing valve 1 is energized, the P port is connected with the B port, and the T port is connected with the A port;

[0023] The P port of the two-position four-way solenoid reversing valve 1 is connected to the main oil inlet line 12, the T port is connected to the main oil return line 13, the A port is connected to one end of the a-end one-way throttle valve of the superimposed double one-way throttle valve 2, and the B port is connected to one end of the b-end one-way throttle valve of the superimposed double one-way throttle valve 2; the other end of the a-end one-way throttle valve of the superimposed double one-way throttle valve 2 is connected to one end of the a-end hydraulically controlled one-way valve of the superimposed hydraulically controlled one-way valve 3, and the other end of the b-end one-way throttle valve of the superimposed hydraulically controlled one-way valve 2 is connected to the superimposed hydraulically controlled one-way valve 3. One end of the hydraulically controlled one-way valve at the b-end of the superimposed hydraulically controlled one-way valve 3; the other end of the hydraulically controlled one-way valve at the a-end of the superimposed hydraulically controlled one-way valve 3 is connected to the rodless chamber of the oil cylinder 11, and the other end of the hydraulically controlled one-way valve at the b-end of the superimposed hydraulically controlled one-way valve 3 is connected to the rod chamber of the oil cylinder 11; one end of the first normally closed two-position two-way solenoid reversing valve 4 is connected to the oil inlet main circuit 12, and the other end is connected to the rodless chamber of the oil cylinder 11; one end of the second normally closed two-position two-way solenoid reversing valve 5 is connected to the rod chamber of the oil cylinder 11, and the other end is connected to the oil return main circuit 13.

[0024] The nozzle replacement system consists of two nozzles, an upper nozzle and an lower nozzle. In the working state, the center lines of the inner holes coincide to ensure the fluidity of the molten steel. The nozzle in the casting state and the spare nozzle are both positioned in the slide. When replacing, press the start button and the hydraulic cylinder drive system will work to push the spare nozzle from the spare position to the working position. After replacing the nozzle, the center line deviation of the upper and lower nozzles is small, and the molten steel is injected into the crystallizer through the new nozzle to complete the continuous casting process.

[0025] Specific working process:

[0026] The oil cylinder 11 moves quickly: the oil cylinder 11 quickly pushes out the spare water inlet and moves it along the slide to the casting position. At the same time, the original water inlet is pushed out of the casting position, and the new water inlet starts to work. At this time, the pulling speed should be adjusted appropriately, and then the return stroke is used to retract the oil cylinder 11 and remove the original water inlet.

[0027] The oil pump outputs oil into the hydraulic system from the oil inlet, and the oil enters the main oil inlet line 12 through the one-way valve 6. The first normally closed two-position two-way solenoid reversing valve 4 is energized, the valve core opens, and the oil enters the rodless chamber of the cylinder 11, the pressure increases, and the second normally closed two-position two-way solenoid reversing valve 5 is energized, the valve core opens, and the oil in the rod chamber of the cylinder 11 is connected to the oil tank, realizing the rapid ejection action of the cylinder piston rod.

[0028] The oil cylinder 11 moves slowly: the tundish water inlet adjusts the opening of the sliding water inlet according to the production process requirements to control the steel flow rate. The oil cylinder 11 is controlled to stay at any position, and will not move due to external force after staying.

[0029] The oil pump outputs oil into the hydraulic system from the oil inlet, and the oil enters the main oil inlet 12 through the one-way valve 6. The two-position four-way electromagnetic reversing valve 1 is in the neutral state under normal conditions, the P port is cut off, the A port and the B port are connected to the T port, the pressure is zero, and the control valve does not operate. The electromagnet b end of the two-position four-way electromagnetic reversing valve 1 is energized, the P port is connected to the A port, and the oil enters the rodless chamber of the oil cylinder 11 through the a-end one-way throttle valve of the superimposed double one-way throttle valve 2 and the a-end hydraulic control one-way valve of the superimposed hydraulic control one-way valve 3. The B port is connected to the T port, and the oil in the rod chamber of the oil cylinder 11 flows through the b-end hydraulic control one-way valve of the superimposed hydraulic control one-way valve 3 and the b-end one-way throttle valve of the superimposed double one-way throttle valve 2, and flows back to the oil tank 14 through the BT port of the two-position four-way electromagnetic reversing valve 1, and the oil cylinder 11 realizes a slow push-out action. The electromagnet a end of the two-position four-way solenoid reversing valve 1 is energized, the P port is connected to the B port, and the oil enters the rod chamber of the oil cylinder 11 through the b end one-way throttle valve of the superimposed double one-way throttle valve 2 and the b end hydraulic control one-way valve of the superimposed hydraulic control one-way valve 3. The A port is connected to the T port, and the oil in the rodless chamber of the oil cylinder 11 flows through the a end hydraulic control one-way valve of the superimposed hydraulic control one-way valve 3 and the a end one-way throttle valve of the superimposed double one-way throttle valve 2, and flows back to the oil tank 14 through the AT port of the two-position four-way solenoid reversing valve 1, and the oil cylinder 11 realizes a slow retraction action.

[0030] Accumulator replenishment working system: After the oil pump outputs the oil through the one-way valve 6, part of the oil enters the accumulator 10 through the normally open high-pressure ball valve 7 until the set pressure value is reached and the accumulator 10 is full. When there is a sudden power outage and the oil pump stops working, causing the system pipeline pressure to drop, the accumulator 10 will press the oil back to the main oil inlet 12 to provide a certain pressure of pressure oil to ensure the normal operation of the hydraulic system. The accumulator safety valve 9 mainly protects the hydraulic system from overload. When the pressure exceeds the preset value, the accumulator safety valve 9 can automatically open to release the excess pressure to avoid dangerous accidents. When repairing or replacing the accumulator 10, the normally open high-pressure ball valve 7 is closed and the normally closed high-pressure ball valve 8 is opened to release the oil inside the accumulator 10.

[0031] The hydraulic control system for the sliding water inlet of the continuous casting machine tundish provided by the present invention provides power for the opening and closing of the sliding water inlet, can realize fast and slow opening and closing, and can realize position control. The system is equipped with an accumulator safety system to ensure that in the event of a sudden power outage, the sliding water inlet can still be opened and closed two or three times when the oil pump of the system stops working, thereby preventing the molten steel from cooling and solidifying. The hydraulic control system uses a high-pressure oil cylinder to generate pressure to lock and release the water inlet, thereby reducing costs and improving efficiency. The system has a simple structure, clear actions, clear principles, high reliability, a wide range of applications, and obvious effects.

[0032] The hydraulic control system for the sliding nozzle of the tundish of the continuous casting machine provided by the present invention can meet the control requirements under different working conditions, has a small size, and is easy to install and maintain.

[0033] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A hydraulic control system for a sliding nozzle of a tundish of a continuous casting machine, characterized in that: It comprises an accumulator safety system and two oil cylinder control systems connected in parallel between an oil inlet main path (12) and an oil return main path (13); the oil inlet main path (12) is connected to an oil pump via a one-way valve (6), and the oil return main path (13) is connected to an oil tank (14); The accumulator safety system comprises an accumulator (10), a normally open high-pressure ball valve (7) and an accumulator safety valve (9); one end of the normally open high-pressure ball valve (7) is connected to the main oil inlet path (12), and the other end is connected to the accumulator (10) and the inlet end of the accumulator safety valve (9); the outlet end of the accumulator safety valve (9) is connected to the main oil return path (13); The oil cylinder control oil circuit comprises a two-position four-way electromagnetic reversing valve (1), a superimposed double one-way throttle valve (2), a superimposed hydraulic control one-way valve (3), a first normally closed two-position two-way electromagnetic reversing valve (4), a second normally closed two-position two-way electromagnetic reversing valve (5) and an oil cylinder (11); When the two-position four-way electromagnetic reversing valve (1) is in a neutral state, port P is blocked, and port T is connected to ports A and B; when end b of the two-position four-way electromagnetic reversing valve (1) is energized, port P is connected to port A, and port T is connected to port B; when end a of the two-position four-way electromagnetic reversing valve (1) is energized, port P is connected to port B, and port T is connected to port A; The P port of the two-position four-way electromagnetic reversing valve (1) is connected to the main oil inlet path (12), the T port is connected to the main oil return path (13), the A port is connected to one end of the one-way throttle valve at the a-end of the stacked double one-way throttle valve (2), and the B port is connected to one end of the one-way throttle valve at the b-end of the stacked double one-way throttle valve (2); the other end of the one-way throttle valve at the a-end of the stacked double one-way throttle valve (2) is connected to one end of the hydraulically controlled one-way valve at the a-end of the stacked hydraulically controlled one-way valve (3), and the other end of the one-way throttle valve at the b-end of the stacked hydraulically controlled one-way valve (3) is connected to the ); the other end of the hydraulically controlled one-way valve at the a-end of the stacked hydraulically controlled one-way valve (3) is connected to the rodless chamber of the oil cylinder (11), and the other end of the hydraulically controlled one-way valve at the b-end of the stacked hydraulically controlled one-way valve (3) is connected to the rod-carrying chamber of the oil cylinder (11); one end of the first normally closed two-position two-way electromagnetic reversing valve (4) is connected to the oil inlet main path (12), and the other end is connected to the rodless chamber of the oil cylinder (11); one end of the second normally closed two-position two-way electromagnetic reversing valve (5) is connected to the rod-carrying chamber of the oil cylinder (11), and the other end is connected to the oil return main path (13).

2. The hydraulic control system for sliding nozzle of continuous casting machine tundish according to claim 1, characterized in that: The accumulator safety system further comprises a normally closed high-pressure ball valve (8), one end of the normally closed high-pressure ball valve (8) being connected to the accumulator (10) and the other end being connected to the main oil return path (13).

Images