Tundish collector nozzle hydraulic control system

Abstract

The utility model discloses a tundish collector nozzle hydraulic control system. The tundish collector nozzle hydraulic control system comprises a main control oil loop and an accident loop. The main control oil loop comprises a hydraulic cylinder, a high-pressure pipeline, an oil return pipeline and a two-position four-way reversing valve. One end of the high-pressure pipeline is communicated with a rod cavity of the hydraulic cylinder; one end of the oil return pipeline is communicated with a rodless cavity of the hydraulic cylinder; the two-position four-way reversing valve is installed on the high-pressure pipeline and the oil return pipeline. The accident loop comprises a two-position three-way reversing valve, a first pipeline, a second pipeline, a first hydraulic control one-way valve and a second hydraulic control one-way valve. The two-position three-way reversing valve is mounted on the high-pressure pipeline and the oil return pipeline; one end of the first pipeline communicates with the two-position three-way reversing valve, and the other end of the first pipeline communicates with a rodless cavity of the hydraulic cylinder. The second pipeline is communicated with a rod cavity of the hydraulic cylinder and the oil return pipeline; the first hydraulic control one-way valve is installed on the high-pressure pipeline and located between the two-position three-way reversing valve and the two-position four-way reversing valve. The second hydraulic control one-way valve is installed on the second pipeline. Control oil ways of the first hydraulic control one-way valve and the second hydraulic control one-way valve are both connected to the first pipeline.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of hydraulic systems, and particularly relates to a tundish nozzle hydraulic control system. BACKGROUND

[0002] With the continuous development of continuous steel casting technology, the on-line quick replacement of tundish nozzles (also known as submerged entry nozzles, hereinafter referred to as nozzles) has been widely applied to slab continuous casting machines. In the related art, the nozzles are replaced by a hydraulic system. Specifically, the hydraulic cylinder rod of the hydraulic system drives the new nozzle to move along the extension direction of the cylinder rod, so that the new nozzle is ejected from the replaced nozzle and the position of the replaced nozzle, thereby realizing the quick replacement of the nozzle. In addition to being able to drive the nozzle to move when replacing the nozzle, the cylinder rod of the hydraulic cylinder will also drive the plugging piece for plugging the nozzle to move when the continuous casting machine is normally running, so that the plugging piece can be switched between a first state of being in contact with the nozzle to plug the nozzle and a second state of making the plugging plate away from the nozzle to open the nozzle.

[0003] In actual production process, the nozzle quick replacement hydraulic system of the tundish of the continuous casting machine has a high failure rate. Once the tundish nozzle hydraulic control system in the related art fails, the hydraulic cylinder will not be able to move, which will result in the failure to realize the functions of quick replacement of the nozzle and plugging of the nozzle in an emergency, which is likely to cause the overflow of molten steel in the crystallizer, burn the equipment, and cause fire accidents, which will not only cause huge economic losses, but also endanger the safety of the on-site personnel.

[0004] Therefore, in the related art, the tundish nozzle hydraulic control system has the technical problem of low safety performance. CONTENT OF THE INVENTION

[0005] The present application aims to at least solve the technical problem of low safety performance of the tundish nozzle hydraulic control system in the related art. To this end, the present application provides a tundish nozzle hydraulic control system.

[0006] The tundish nozzle hydraulic control system provided by the embodiments of the present application comprises a main control oil circuit and an accident circuit.

[0007] The main control oil circuit comprises:

[0008] a hydraulic cylinder;

[0009] a high-pressure pipeline, one end of which is in communication with the rod cavity of the hydraulic cylinder;

[0010] a return oil pipeline, one end of which is in communication with the rodless cavity of the hydraulic cylinder;

[0011] a two-position four-way directional valve, which is installed on the high-pressure pipeline and the return oil pipeline.

[0012] The accident circuit comprises:

[0013] A two-position three-way directional valve is installed on the high-pressure pipeline and the oil return pipeline.

[0014] A first pipeline is connected to one end of the two-position three-way directional valve and the other end of the rodless chamber of the hydraulic cylinder.

[0015] A second pipeline is connected to the rod chamber of the hydraulic cylinder and the oil return pipeline.

[0016] A first hydraulic control check valve is installed on the high-pressure pipeline and located between the two-position three-way directional valve and the two-position four-way directional valve.

[0017] A second hydraulic control check valve is installed on the second pipeline.

[0018] The control oil paths of the first hydraulic control check valve and the second hydraulic control check valve are connected to the first pipeline.

[0019] In some embodiments, one end of the second pipeline connected to the oil return pipeline is located between the two-position four-way directional valve and the oil return port T of the oil return pipeline.

[0020] In some embodiments, the main control oil circuit further comprises a third hydraulic control check valve, which is installed on the oil return pipeline and located between the two-position four-way directional valve and the hydraulic cylinder, and the control oil path of the third hydraulic control check valve is connected to the high-pressure pipeline and located between the two-position four-way directional valve and the hydraulic cylinder.

[0021] In some embodiments, the accident circuit further comprises a fourth check valve, which is installed on the first pipeline, and the control oil paths of the first hydraulic control check valve and the second hydraulic control check valve are connected between the fourth check valve and the two-position three-way directional valve.

[0022] In some embodiments, the main control oil circuit further comprises a two-position two-way cartridge directional valve, which is installed on the high-pressure pipeline to control the on-off of the high-pressure pipeline, and the two-position two-way cartridge directional valve is located between the oil inlet port P of the high-pressure pipeline and the two-position three-way directional valve.

[0023] In some embodiments, the tundish nozzle hydraulic control system further comprises an energy storage circuit, which comprises:

[0024] A third pipeline is connected to the high-pressure pipeline and the oil return pipeline.

[0025] An energy accumulator is installed on the third pipeline.

[0026] An overflow valve is installed in the third pipeline and located between the accumulator and the oil return pipeline.

[0027] In some embodiments, the accumulator circuit further comprises an adjustable flow valve installed in the third pipeline and arranged in parallel with the overflow valve.

[0028] In some embodiments, the accumulator circuit further comprises a pressure relief valve installed in the third pipeline and located between the high-pressure pipeline and the accumulator.

[0029] In some embodiments, the main control oil circuit further comprises a double one-way throttle valve installed in the high-pressure pipeline and the oil return pipeline and located between the two-position four-way directional valve and the hydraulic cylinder.

[0030] In some embodiments, the main control oil circuit further comprises an insertion pressure reducing valve installed in the high-pressure pipeline and the oil return pipeline and located between the two-position four-way directional valve and the hydraulic cylinder.

[0031] The utility model has at least the following beneficial effects:

[0032] When the intermediate ladle downcomer hydraulic control system is in normal operation, the electromagnet b2 of the two-position three-way directional valve cannot be electrified, the hydraulic oil in the hydraulic oil tank enters the high-pressure pipeline under the action of the oil pump and reaches the two-position three-way directional valve and the first hydraulic control one-way valve, because the electromagnet b2 of the two-position three-way directional valve cannot be electrified at this time, the hydraulic oil is cut off at P2, the first hydraulic control one-way valve and the second hydraulic control one-way valve are both in the unopened state (one-way through state), after the hydraulic oil passes through the first hydraulic control one-way valve, it passes through the two-position four-way directional valve, the direction of the subsequent pipeline is changed by changing the position of the valve core of the two-position four-way directional valve, thereby the cylinder rod of the hydraulic cylinder is controlled to extend and retract.

[0033] When it is found that the control two-position four-way directional valve and other components make the cylinder rod extend and retract, but the cylinder rod does not act, that is, when it is found that the cylinder rod cannot act, the electromagnet b2 of the two-position three-way directional valve is electrified, P2 and A2 are communicated, the hydraulic oil will enter the control oil way of the first hydraulic control one-way valve and the second hydraulic control one-way valve respectively, the first hydraulic control one-way valve and the second hydraulic control one-way valve are both in the bidirectional through state, the hydraulic oil will pass through the first pipeline to reach the rodless cavity of the hydraulic cylinder, the hydraulic oil of the rod cavity will return to the oil return pipeline through the second pipeline, the cylinder rod of the hydraulic cylinder will extend, thereby the downcomer replacement or downcomer closing function can be realized.

[0034] This application, through the design of an emergency circuit, enables the cylinder rod to extend when the hydraulic cylinder fails to operate due to a malfunction in the main control circuit. This allows the drain outlet to be replaced or closed, effectively preventing molten steel overflow caused by malfunctions in the two-position three-way directional valve or other components in the main control circuit. This improves the safety performance of the hydraulic control system for the tundish drain outlet. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 A schematic diagram of the hydraulic control system for the tundish drain outlet in one or more embodiments of this application is shown.

[0037] Reference numerals: 101, First check valve; 102, Second check valve; 103, Third check valve; 104, Fourth check valve; 201, First pressure measuring point; 202, Second pressure measuring point; 203, Third pressure measuring point; 204, Fourth pressure measuring point; 205, Fifth pressure measuring point; 206, Sixth pressure measuring point; 207, Seventh pressure measuring point; 208, Eighth pressure measuring point; 301, Pressure relief valve; 401, Accumulator; 501, Adjustable flow valve; 601, Overflow valve; 701, Pressure relay; 8 01. Two-position two-way cartridge directional valve; 901. First hydraulically controlled check valve; 902. Second hydraulically controlled check valve; 903. Third hydraulically controlled check valve; 1001. Two-position three-way directional valve; 1101. Two-position four-way directional valve; 1201. Cartridge pressure reducing valve; 1301. Double one-way throttle valve; 1401. First high-pressure hose; 1402. Second high-pressure hose; 1501. Hydraulic cylinder; 10. High-pressure pipeline; 20. Return oil pipeline; 30. First pipeline; 40. Second pipeline; 50. Third pipeline. Detailed Implementation

[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0039] It should be noted that all directional indications in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0040] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0041] Furthermore, in this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0042] In related technologies, the hydraulic control system for the tundish drain outlet suffers from low safety performance. This application provides a hydraulic control system for the tundish drain outlet, which at least partially addresses the problem of low safety performance in such systems.

[0043] This application is described below with reference to the accompanying drawings and specific embodiments:

[0044] like Figure 1 As shown, the hydraulic control system for the tundish drain outlet includes a main control oil circuit and an emergency circuit.

[0045] The main control oil circuit includes a hydraulic cylinder 1501, a high-pressure line 10, a return line 20, and a two-position four-way directional valve 1101. One end of the high-pressure line 10 is connected to the rod chamber of the hydraulic cylinder 1501; one end of the return line 20 is connected to the rodless chamber of the hydraulic cylinder 1501; the two-position four-way directional valve 1101 is installed on the high-pressure line 10 and the return line 20.

[0046] It is readily understood that, in using this application, a hydraulic pump (not shown in the figure) is installed at the other end of the high-pressure pipeline 10, and both the other end of the high-pressure pipeline 10 and the other end of the return oil pipeline 20 are connected to a hydraulic oil tank (not shown in the figure) for storing hydraulic oil. The connection relationships between the various ports of the two-position four-way directional valve 1101 and the high-pressure pipeline 10 and the return oil pipeline 20 can be found by referring to... Figure 1 As shown. Figure 1 As shown, ports A3 and P3 of the two-position four-way directional valve 1101 are connected to the high-pressure pipeline 10, and ports B3 and T3 are connected to the return oil pipeline 20. After the two-position four-way directional valve 1101 is installed, the extension or retraction of the cylinder rod of the hydraulic cylinder 1501 can be controlled by adjusting the working position of the two-position four-way directional valve 1101.

[0047] The emergency circuit includes a two-position three-way directional valve 1001, a first pipeline 30, a second pipeline 40, a first pilot-operated check valve 901, and a second pilot-operated check valve 902. The two-position three-way directional valve 1001 is installed on the high-pressure pipeline 10 and the return pipeline 20; one end of the first pipeline 30 is connected to the two-position three-way directional valve 1001, and the other end is connected to the rodless chamber of the hydraulic cylinder 1501; the second pipeline 40 is connected to the rod chamber of the hydraulic cylinder 1501 and the return pipeline 20; the first pilot-operated check valve 901 is installed on the high-pressure pipeline 10 and is located between the two-position three-way directional valve 1001 and the two-position four-way directional valve 1101; the second pilot-operated check valve 902 is installed on the second pipeline 40. The control oil circuits of the first pilot-operated check valve 901 and the second pilot-operated check valve 902 (…) Figure 1 The dashed line in the middle represents the control oil circuit, which is connected to the first pipeline 30.

[0048] The function of the emergency circuit is to enable the cylinder rod of the hydraulic cylinder 1501 to extend when components such as the two-position four-way directional valve 1101 are damaged, so that the cylinder rod can drive the sealing component to seal the drain outlet and complete the drain outlet closure, or drive a new drain outlet to complete the drain outlet replacement.

[0049] For the connection relationships between the various ports of the two-position three-way directional valve 1001 and the high-pressure pipeline 10, the return oil pipeline 20, and the first pipeline 30, please refer to the appendix. Figure 1 As shown. Figure 1 As shown, the two-position three-way directional valve has port P2 connected to high-pressure line 10, port T2 connected to return line 20, and port A2 connected to one end of the first line 30. One end of the second line 40 is connected to the rod chamber of hydraulic cylinder 1501, and the other end is connected to return line 20. It should be noted that, as... Figure 1As shown, when the control oil circuit of the first hydraulic check valve 901 is not connected to hydraulic oil, the first hydraulic check valve 901 is in the passage along the oil inlet direction of the high pressure pipeline 10, that is, along the oil inlet P of the high pressure pipeline 10 to the two-position four-way directional valve 1101; when the control oil circuit of the second hydraulic check valve 902 is not connected to hydraulic oil, the second hydraulic check valve 902 is in the passage along the return oil pipeline 20 to the hydraulic cylinder 1501, that is, along the end of the second pipeline 40 connected to the return oil pipeline 20 to the end connected to the rod chamber.

[0050] After designing as described above:

[0051] When the hydraulic control system of the intermediate tundish drain outlet is operating normally, the solenoid b2 of the two-position three-way directional valve 1001 is not energized. The hydraulic oil in the hydraulic oil tank enters the high-pressure pipeline 10 under the action of the oil pump and reaches the two-position three-way directional valve 1001 and the first hydraulic control check valve 901. Since the solenoid b2 of the two-position three-way directional valve 1001 is not energized at this time, the hydraulic oil is cut off at P2. The first hydraulic control check valve 901 and the second hydraulic control check valve 902 are both in the closed state (one-way state). After the hydraulic oil passes through the first hydraulic control check valve 901, it passes through the two-position four-way directional valve 1101. By changing the position of the valve core of the two-position four-way directional valve 1101, the direction of the subsequent pipeline is changed, thereby controlling the extension and retraction of the cylinder rod of the hydraulic cylinder 1501.

[0052] When it is found that the control components such as the two-position four-way directional valve 1101 cause the cylinder rod to extend and retract, but the cylinder rod does not move, that is, when it is found that the cylinder rod cannot move, the electromagnet b2 of the two-position three-way directional valve 1001 is energized, P2 and A2 are connected, and the hydraulic oil will enter the control oil circuit of the first hydraulic control check valve 901 and the second hydraulic control check valve 902 respectively. The first hydraulic control check valve 901 and the second hydraulic control check valve 902 are both in a bidirectional state. The hydraulic oil will reach the rodless chamber of the hydraulic cylinder 1501 through the first pipeline 30, and the hydraulic oil in the rod chamber will return to the return oil pipeline 20 through the second pipeline 40. The cylinder rod of the hydraulic cylinder 1501 will extend, thereby realizing the function of changing or closing the drain outlet.

[0053] In summary, this application, through the design of the emergency circuit, enables the cylinder rod to extend when the main control circuit fails and the hydraulic cylinder 1501 cannot operate. This allows the drain outlet to be replaced or closed, effectively preventing molten steel overflow caused by malfunctions in the main control circuit, such as the two-position three-way directional valve 1001, and improving the safety performance of the hydraulic control system for the tundish drain outlet.

[0054] In some embodiments, one end of the second pipeline 40 connected to the return oil pipeline 20 is located between the two-position four-way directional valve 1101 and the return oil port T of the return oil pipeline 20. This design ensures that when oil returns through the second pipeline 40, the oil does not pass through the two-position four-way directional valve 1101 and flows directly back to the hydraulic oil tank. This prevents the hydraulic oil in the second pipeline 40 from failing to return to the hydraulic oil tank in case of malfunctions such as jamming of the two-position four-way directional valve 1101, which could lead to cylinder rod extension failure. This further improves the safety performance of the hydraulic control system at the tundish drain port.

[0055] In some embodiments, the main control oil circuit further includes a third hydraulic control check valve 903, which is installed in the return oil line 20 and located between the two-position four-way directional valve 1101 and the hydraulic cylinder 1501; the control oil circuit of the third hydraulic control check valve 903 is connected to the high-pressure line 10 and is connected between the two-position four-way directional valve 1101 and the hydraulic cylinder 1501.

[0056] It should be noted that, as Figure 1 As shown, when the control oil circuit of the third hydraulically controlled check valve 903 is not connected to hydraulic oil, the third hydraulically controlled check valve 903 is in the passage along the direction from the two-position four-way directional valve 1101 to the hydraulic cylinder 1501. With this design, when oil enters the rod chamber, hydraulic oil simultaneously enters the third hydraulically controlled check valve 903. The third hydraulically controlled check valve 903 is bidirectional, allowing the hydraulic oil in the rodless chamber to flow smoothly into the return oil line 20. The installation of the third hydraulically controlled check valve 903 improves the stability of the hydraulic control system at the tundish drain outlet.

[0057] In some embodiments, the emergency circuit further includes a fourth check valve 104, which is installed in the first pipeline 30. The control oil circuits of the first hydraulic check valve 901 and the second hydraulic check valve 902 are both connected between the fourth check valve 104 and the two-position three-way directional valve 1001.

[0058] It should be noted that the fourth check valve 104 is connected along the oil inlet direction of the rodless chamber, that is: from the end of the first pipeline 30 connected to the two-position three-way directional valve 1001 to the end connected to the rodless chamber, the fourth check valve 104 is connected. The fourth check valve 104 ensures that the hydraulic oil in the first pipeline 30 flows unidirectionally towards the rodless chamber of the hydraulic cylinder 1501, preventing reverse flow and ensuring smooth oil inlet to the rodless chamber in case of an accident.

[0059] In some embodiments, the main control oil circuit further includes a two-position two-way cartridge directional valve 801, which is installed on the high-pressure pipeline 10 and used to control the on / off state of the high-pressure pipeline 10. The two-position two-way cartridge directional valve 801 is located between the oil inlet P of the high-pressure pipeline 10 and the two-position three-way directional valve 1001.

[0060] likeFigure 1 As shown, the Z1, X1, B0, and A0 ports of the two-position two-way cartridge directional valve 801 are all connected to the high-pressure pipeline 10, and the Y1 port is connected to the return oil pipeline 20. With the two-position two-way cartridge directional valve 801 installed, when the solenoid a1 in the valve is energized, B0 and A0 are disconnected, and the high-pressure pipeline 10 is disconnected. When the solenoid a1 is de-energized, P1-A1 and B0-A0 are connected, allowing the hydraulic oil in the high-pressure pipeline 10 to reach the two-position three-way directional valve 1001 and the first hydraulically controlled check valve 901. With this design, when the hydraulic cylinder 1501 requires operation, the high-pressure pipeline 10 is opened; otherwise, it remains disconnected, preventing oil leakage caused by long-term pressure in the pipeline. This effectively reduces the risk of oil leaks and fires, and also facilitates the daily replacement and maintenance of related hydraulic components.

[0061] In some embodiments, the hydraulic control system for the tundish drain outlet further includes an energy storage circuit, which includes a third pipeline 50, an accumulator 401, and a relief valve 601. The third pipeline 50 is connected to the high-pressure pipeline 10 and the return oil pipeline 20; the accumulator 401 is installed in the third pipeline 50; and the relief valve 601 is installed in the third pipeline 50 and is located between the accumulator 401 and the return oil pipeline 20.

[0062] In a hydraulic control system, sudden changes in fluid flow within the pipeline can occur due to factors such as the sudden switching of the 2-position 3-way directional valve 1001, the sudden stop of the hydraulic pump, or the sudden cessation of the hydraulic cylinder 1501, resulting in impact pressure (oil slugging). This impact pressure can damage various components and sealing devices in the system or cause pipeline rupture. The accumulator 401 can absorb and mitigate this impact pressure, protecting other parts of the system from damage to a certain extent. With the relief valve 601 installed, when the pressure in the accumulator 401 exceeds the set value of the relief valve 601, the relief valve 601 overflows, and the hydraulic oil overflows into the return oil line 20, then reaches the hydraulic oil tank. The pressure in the third line 50 drops to the set value, thereby protecting the accumulator 401.

[0063] In some embodiments, the energy storage circuit further includes an adjustable flow valve 501, which is installed in the third pipeline 50 and connected in parallel with the overflow valve 601. The adjustable flow valve 501 is normally closed, and the branch pipeline it is in is blocked. When it is necessary to test the pressure of the accumulator 401 or replace the accumulator 401, the adjustable flow valve 501 opens, releasing the oil pressure inside the accumulator 401, thus facilitating pressure testing and replacement of the accumulator 401.

[0064] In some embodiments, the energy storage circuit further includes a pressure relief valve 301, which is installed in the third pipeline 50 and located between the high-pressure pipeline 10 and the accumulator 401. The pressure relief valve 301 is a normally open ball valve. If it is necessary to test the pressure of the accumulator 401 or replace the accumulator 401, the pressure relief valve 301 can be closed to prevent hydraulic oil in the high-pressure pipeline 10 from entering the third pipeline 50.

[0065] In some embodiments, the main control oil circuit further includes a dual one-way throttle valve 1301, which is installed on the high-pressure line 10 and the return oil line 20, and is located between the two-position four-way directional valve 1101 and the hydraulic cylinder 1501.

[0066] It is easy to understand that the dual one-way throttle valve 1301 includes two one-way throttle valves, one of which is installed on the high-pressure line 10 and the other is installed on the return line 20.

[0067] A one-way throttle valve controls the pressure in a hydraulic system. By adjusting the opening of the one-way throttle valve, the pressure of the fluid passing through the throttle orifice can be controlled. When the opening of the throttle valve increases, the pressure of the fluid passing through the throttle orifice decreases; conversely, when the opening of the one-way throttle valve decreases, the pressure of the fluid passing through the throttle orifice increases. In a hydraulic system, due to sudden switching of the 2-position 3-way directional valve 1001, sudden stopping of the hydraulic pump, or sudden stopping of the hydraulic cylinder 1501, the fluid flow in the pipeline will change drastically, generating shock pressure (oil slugging), which can easily damage the components in the system. The one-way throttle valve can reduce this shock by limiting the fluid flow and pressure, protecting the components in the system. At the same time, it can also reduce vibration caused by changes in flow and pressure, improving the stability of the system.

[0068] In some embodiments, the main control oil circuit further includes a cartridge pressure reducing valve 1201, which is installed on the high pressure line 10 and the return oil line 20, and is located between the two-position four-way directional valve 1101 and the hydraulic cylinder 1501.

[0069] In the embodiment with dual one-way throttle valves 1301, cartridge pressure reducing valve 1201 is located between two-position four-way directional valve 1101 and dual one-way throttle valve 1301. By installing cartridge pressure reducing valve 1201 in the high-pressure line 10, the pressure in the high-pressure line 10 is limited to control the overall hydraulic system, ensuring that the system pressure does not exceed a predetermined safety value. This avoids system damage or malfunction due to excessive pressure to a certain extent, and improves the safety performance of the hydraulic control system at the tundish drain port.

[0070] In some embodiments, the main control oil circuit further includes a pressure relay 701, which is installed on the high-pressure pipeline 10. The pressure relay 701 is used for pressure display of the high-pressure pipeline 10 and can transmit pressure signals to the control module, etc.

[0071] In some embodiments, the hydraulic control system for the tundish drain outlet is equipped with multiple pressure measurement points to facilitate pressure monitoring at various locations. For example... Figure 1 As shown, in some embodiments, a first pressure measuring point 201, a second pressure measuring point 202, a third pressure measuring point 203, a fourth pressure measuring point 204, a fifth pressure measuring point 205, a sixth pressure measuring point 206, a seventh pressure measuring point 207, and an eighth pressure measuring point 208 are provided.

[0072] In some embodiments, the main control oil circuit of the tundish drain hydraulic control system further includes a first check valve 101, a second check valve 102, and a third check valve 103. The first check valve 101 is installed on the high-pressure pipeline 10 and located between the third pipeline 50 and the oil inlet P. The first check valve 101 is in a pass direction from the oil inlet P to the third pipeline 50. The second check valve 102 is installed on the return oil pipeline 20 and located between the return oil pipeline 20 and the two-position two-way cartridge directional valve 801. The second check valve 102 is in a pass direction from the two-position two-way cartridge directional valve 801 to the return oil pipeline 20. The third check valve 103 is installed on the return oil pipeline 20 and located between the second check valve 102 and the two-position three-way directional valve 1001. The third check valve 103 is in a pass direction from the return oil port T to the two-position three-way directional valve 1001.

[0073] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0074] Furthermore, the technical solutions of the various embodiments can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0075] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A tundish nozzle hydraulic control system, characterized by, The hydraulic control system comprises a main control oil circuit and an emergency circuit; The main control oil circuit comprises: a hydraulic cylinder (1501); a high-pressure pipeline (10) having one end in communication with a rod cavity of the hydraulic cylinder (1501); a return oil pipeline (20) having one end in communication with a rodless cavity of the hydraulic cylinder (1501); a two-position four-way directional valve (1101) installed on the high-pressure pipeline (10) and the return oil pipeline (20); The emergency circuit comprises: a two-position three-way directional valve (1001) installed on the high-pressure pipeline (10) and the return oil pipeline (20); a first pipeline (30) having one end in communication with the two-position three-way directional valve (1001) and the other end in communication with the rodless cavity of the hydraulic cylinder (1501); a second pipeline (40) in communication with the rod cavity of the hydraulic cylinder (1501) and the return oil pipeline (20); a first hydraulic control check valve (901) installed on the high-pressure pipeline (10) and located between the two-position three-way directional valve (1001) and the two-position four-way directional valve (1101); a second hydraulic control check valve (902) installed on the second pipeline (40); The control oil paths of the first hydraulic control check valve (901) and the second hydraulic control check valve (902) are connected to the first pipeline (30).

2. The tundish nozzle hydraulic control system of claim 1, wherein The second pipeline (40) is connected to the return oil pipeline (20) at a position between the two-position four-way directional valve (1101) and a return oil port T of the return oil pipeline (20).

3. The tundish nozzle hydraulic control system of claim 1, wherein The main control oil circuit further comprises a third hydraulic control check valve (903) installed on the return oil pipeline (20) and located between the two-position four-way directional valve (1101) and the hydraulic cylinder (1501), and the control oil path of the third hydraulic control check valve (903) is connected to the high-pressure pipeline (10) and located between the two-position four-way directional valve (1101) and the hydraulic cylinder (1501).

4. The tundish nozzle hydraulic control system of claim 1, wherein The emergency circuit further comprises a fourth check valve (104) installed on the first pipeline (30), and the control oil paths of the first hydraulic control check valve (901) and the second hydraulic control check valve (902) are connected between the fourth check valve (104) and the two-position three-way directional valve (1001).

5. The tundish nozzle hydraulic control system according to any one of claims 1-4, wherein, The main control oil circuit further comprises a two-position two-way cartridge directional valve (801) installed on the high-pressure pipeline (10) for controlling the on-off of the high-pressure pipeline (10), and the two-position two-way cartridge directional valve (801) is located between an oil inlet port P of the high-pressure pipeline (10) and the two-position three-way directional valve (1001).

6. The tundish nozzle hydraulic control system according to any one of claims 1-4, wherein, The intermediate ladle nozzle hydraulic control system further comprises an energy storage circuit, and the energy storage circuit comprises: a third pipeline (50) connected to the high-pressure pipeline (10) and the return oil pipeline (20); an energy accumulator (401) installed on the third pipeline (50); An overflow valve (601) is installed in the third pipeline (50) and located between the accumulator (401) and the oil return pipeline (20).

7. The tundish nozzle hydraulic control system of claim 6, wherein, The accumulator circuit further comprises an adjustable flow valve (501) installed in the third pipeline (50) and arranged in parallel with the overflow valve (601).

8. The tundish nozzle hydraulic control system of claim 6, wherein, The accumulator circuit further comprises a pressure relief valve (301) installed in the third pipeline (50) and located between the high-pressure pipeline (10) and the accumulator (401).

9. The tundish nozzle hydraulic control system according to any one of claims 1-4, wherein, The main control oil circuit further comprises a double one-way throttle valve (1301) installed in the high-pressure pipeline (10) and the oil return pipeline (20) and located between the two-position four-way directional valve (1101) and the hydraulic cylinder (1501).

10. The tundish nozzle hydraulic control system according to any one of claims 1-4, wherein, The main control oil circuit further comprises a plug-in pressure reducing valve (1201) installed in the high-pressure pipeline (10) and the oil return pipeline (20) and located between the two-position four-way directional valve (1101) and the hydraulic cylinder (1501).

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