Hydraulic control system for stopper rod

Abstract

The utility model discloses a stopper hydraulic control system. The stopper 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 servo 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 servo valves are installed on the high-pressure pipeline and the oil return pipeline. The accident loop comprises a second two-position four-way reversing valve, a first pipeline, a second pipeline, a third one-way valve and a fourth one-way valve. And the second two-position four-way reversing valve is mounted on the high-pressure pipeline and the oil return pipeline. One end of the first pipeline communicates with the second two-position four-way reversing valve, and the other end of the first pipeline communicates with a rod cavity of the hydraulic cylinder. One end of the second pipeline communicates with the second two-position four-way reversing valve, and the other end of the second pipeline communicates with a rodless cavity of the hydraulic cylinder. The third one-way valve is installed on the first pipeline, and the third one-way valve is conducted in the direction from the second two-position four-way reversing valve to the rod cavity. The fourth one-way valve is installed on the second pipeline, and the fourth one-way valve is switched on in the direction from the rodless cavity to the second two-position four-way reversing valve.

Description

Technical Field

[0001] This application belongs to the technical field of hydraulic systems, and particularly relates to a piston rod hydraulic control system. Background Technology

[0002] The tundish is a refractory container used in short-process steelmaking. It first receives molten steel poured from the ladle, and then distributes it to the various crystallizers through the tundish's outlet. Stoppers are refractory rods used to control the opening and closing of the tundish's top nozzle and the flow rate of molten steel.

[0003] Currently, both domestically and internationally, stopper rods are typically controlled using a hydraulic control system. However, in actual production processes, the hydraulic control system for stopper rods has a high failure rate. If the hydraulic control system malfunctions, the hydraulic cylinder will be unable to move, preventing the stopper rod from regulating the molten steel flow. This can lead to uncontrolled molten steel flow and potentially cause accidents such as fires.

[0004] Therefore, in related technologies, the piston rod hydraulic control system has the technical problem of low safety performance. Utility Model Content

[0005] This application aims to at least partially address the technical problem of low safety performance in piston rod hydraulic control systems in related technologies. To this end, this application provides a piston rod hydraulic control system.

[0006] This application provides a piston rod hydraulic control system, including a main control oil circuit and an emergency circuit;

[0007] The main control oil circuit includes:

[0008] Hydraulic cylinder;

[0009] A high-pressure pipeline, one end of which is connected to the rod chamber of the hydraulic cylinder;

[0010] The return oil line has one end connected to the rodless chamber of the hydraulic cylinder;

[0011] A servo valve is installed on the high-pressure pipeline and the return oil pipeline;

[0012] The fault circuit includes:

[0013] The second two-position four-way directional valve is installed in the high-pressure pipeline and the return oil pipeline;

[0014] The first pipeline has one end connected to the second two-position four-way directional valve and the other end connected to the rod chamber of the hydraulic cylinder.

[0015] The second pipeline has one end connected to the second two-position four-way directional valve and the other end connected to the rodless chamber of the hydraulic cylinder.

[0016] A third check valve is installed in the first pipeline, and is open along the direction from the second two-position four-way directional valve to the rod chamber.

[0017] A fourth check valve is installed in the second pipeline, and is open along the direction from the rodless chamber to the second two-position four-way directional valve.

[0018] In some embodiments, the piston rod hydraulic control system further includes a control loop, the control loop comprising:

[0019] A first hydraulically controlled check valve is installed in the high-pressure pipeline, and the first hydraulically controlled check valve is located between the servo valve and the oil inlet P of the high-pressure pipeline;

[0020] The first two-position four-way directional valve is installed in the high-pressure pipeline, and the first two-position four-way directional valve is located between the first hydraulic control check valve and the oil inlet P of the high-pressure pipeline.

[0021] The control oil circuit of the first hydraulically controlled check valve is connected to the first two-position four-way directional valve.

[0022] In some embodiments, the control loop further includes:

[0023] The second hydraulically controlled check valve is installed in the high-pressure pipeline and located between the servo valve and the hydraulic cylinder. The control oil circuit of the second hydraulically controlled check valve is connected to the first two-position four-way directional valve.

[0024] And / or,

[0025] The third hydraulically controlled check valve is installed in the return oil line and is located between the servo valve and the hydraulic cylinder. The control oil line of the third hydraulically controlled check valve is connected to the first two-position four-way directional valve.

[0026] In some embodiments, the main control oil circuit further includes:

[0027] A first relief valve is installed in the high-pressure pipeline and the return oil pipeline, and is located between the servo valve and the hydraulic cylinder. The first relief valve is used to overflow the hydraulic oil in the high-pressure pipeline to the return oil pipeline.

[0028] The second relief valve is installed between the high-pressure pipeline and the return oil pipeline, and is located between the servo valve and the hydraulic cylinder. The second relief valve is used to overflow the hydraulic oil in the return oil pipeline to the high-pressure pipeline.

[0029] In some embodiments, the main control oil circuit further includes a plate ball valve, which is installed in the high-pressure pipeline and the return oil pipeline, and is located between the servo valve and the hydraulic cylinder.

[0030] In some embodiments, the piston rod hydraulic control system further includes an energy storage circuit, the energy storage circuit comprising:

[0031] The third pipeline is connected to the high-pressure pipeline and the return oil pipeline;

[0032] An energy accumulator is installed in the third pipeline;

[0033] A pressure relief valve is installed on the third pipeline and located between the accumulator and the return oil pipeline.

[0034] In some embodiments, the energy storage circuit further includes a second ball valve, which is installed in the third pipeline and located between the energy storage device and the high-pressure pipeline.

[0035] In some embodiments, the main control oil circuit further includes a filter, which is installed in the high-pressure pipeline and located between the first hydraulic check valve and the oil inlet P of the high-pressure pipeline.

[0036] In some embodiments, the main control oil circuit further includes a differential pressure switch, which is installed in the high-pressure pipeline and connected in parallel with the filter.

[0037] In some embodiments, the main control oil circuit further includes a pressure reducing valve, which is installed on the high-pressure pipeline and the return oil pipeline, and is located between the first hydraulic check valve and the oil inlet P of the high-pressure pipeline.

[0038] This utility model has at least the following beneficial effects:

[0039] When the piston rod hydraulic control system is operating normally, the solenoid a3 of the second two-position four-way directional valve is energized. The hydraulic oil in the hydraulic oil tank enters the high-pressure pipeline under the action of the oil pump and reaches the servo valve and the second two-position four-way directional valve. Since the solenoid a3 of the second two-position four-way directional valve is energized at this time, P3 and B3 are connected, and the hydraulic oil is cut off when it reaches the second check valve. By changing the position of the servo valve core, the direction of the subsequent pipeline is changed, thereby controlling the extension and retraction of the cylinder rod of the hydraulic cylinder.

[0040] When the liquid level in the crystallizer is found to be too high or too low, or when the cylinder rod is found to be unable to move despite the control of components such as the servo valve to extend and retract, i.e. when the cylinder rod is found to be unable to move, the solenoid a3 of the second two-position four-way directional valve is de-energized, P3 and A3 are connected, and the hydraulic oil reaches the rod chamber of the hydraulic cylinder through the third check valve. The hydraulic oil in the rodless chamber flows back through the second check valve, the cylinder rod retracts, thereby driving the stopper rod to block the water inlet.

[0041] In summary, this application, through the design of the emergency circuit, enables the cylinder rod to retract when the main control oil circuit fails and the hydraulic cylinder cannot operate. This allows the sprue to be blocked by the stopper rod, preventing further injection of molten steel into the tundish. This effectively avoids situations such as uncontrolled molten steel flow and molten steel overflow caused by servo valve failures in the main control oil circuit, thereby improving the safety performance of the stopper rod hydraulic control system. Attached Figure Description

[0042] 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.

[0043] Figure 1 A schematic diagram of the hydraulic control system for the stopper rod in one or more embodiments of this application is shown.

[0044] Reference numerals: 101, First ball valve; 102, Second ball valve; 201, First check valve; 202, Second check valve; 203, Third check valve; 204, Fourth check valve; 301, First pressure measuring point; 302, Second pressure measuring point; 303, Third pressure measuring point; 304, Fourth pressure measuring point; 305, Fifth pressure measuring point; 306, Sixth pressure measuring point; 307, Seventh pressure measuring point; 308, Eighth pressure measuring point; 401, Pressure reducing valve; 501, Filter; 601, Differential pressure switch; 701, Pressure relief valve; 801, Accumulator; 901, First two-position four-way directional valve; 902, Second two-position four-way directional valve. Check valve; 1001, First hydraulically controlled check valve; 1002, Second hydraulically controlled check valve; 1003, Third hydraulically controlled check valve; 1101, Servo valve; 1201, First relief valve; 1202, Second relief valve; 1301, First quick connector; 1302, Second quick connector; 1401, First pressure relay; 1402, Second pressure relay; 1501, Plate ball valve; 1601, First hose; 1602, Second hose; 1701, Hydraulic cylinder; 1702, Cylinder sensor; 10, High-pressure pipeline; 20, Return oil pipeline; 30, First pipeline; 40, Second pipeline; 50, Third pipeline. Detailed Implementation

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] In related technologies, stopper rod hydraulic control systems suffer from low safety performance. This application provides a stopper rod hydraulic control system that can at least partially address the low safety performance problem of stopper rod hydraulic control systems in related technologies.

[0050] This application is described below with reference to the accompanying drawings and specific embodiments:

[0051] like Figure 1 As shown, the piston rod hydraulic control system includes a main control oil circuit and an emergency circuit.

[0052] The main control oil circuit includes a hydraulic cylinder 1701, a high-pressure line 10, a return line 20, and a servo valve 1101. One end of the high-pressure line 10 is connected to the rod chamber of the hydraulic cylinder 1701; one end of the return line 20 is connected to the rodless chamber of the hydraulic cylinder 1701; and the servo valve 1101 is installed on both the high-pressure line 10 and the return line 20.

[0053] It is readily understood that, in using this application, a hydraulic pump 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 storing hydraulic oil. The connection relationships between the various ports of the servo valve 1101 and the high-pressure pipeline 10 and the return oil pipeline 20 can be found by referring to... Figure 1 As shown. After setting the servo valve 1101, the extension or retraction of the cylinder rod of the hydraulic cylinder 1701 can be controlled by adjusting the working position of the servo valve 1101.

[0054] The emergency circuit includes a second two-position four-way directional valve 902, a first pipeline 30, a second pipeline 40, a third check valve 203, and a fourth check valve 204. The second two-position four-way directional valve 902 is installed on the high-pressure pipeline 10 and the return pipeline 20. One end of the first pipeline 30 is connected to the second two-position four-way directional valve 902, and the other end is connected to the rod chamber of the hydraulic cylinder 1701. One end of the second pipeline 40 is connected to the second two-position four-way directional valve 902, and the other end is connected to the rodless chamber of the hydraulic cylinder 1701. The third check valve 203 is installed on the first pipeline 30 and is open along the direction from the second two-position four-way directional valve 902 to the rod chamber. The fourth check valve 204 is installed on the second pipeline 40 and is open along the direction from the rodless chamber to the second two-position four-way directional valve 902.

[0055] The function of the emergency circuit is to retract the cylinder rod of the hydraulic cylinder 1701 when components such as the servo valve 1101 are damaged, so that the cylinder rod can drive the stopper rod to gradually approach the water inlet and block the water inlet.

[0056] The connection relationships between the various ports of the second two-position four-way directional valve 902 and the high-pressure line 10, return line 20, first line 30, and second line 40 can be found in the following reference. Figure 1 As shown. Figure 1 As shown, the P3 port of the second two-position four-way directional valve 902 is connected to the high-pressure pipeline 10, the T3 port is connected to the return oil pipeline 20, the A3 port is connected to one end of the first pipeline 30, and the B3 port is connected to one end of the second pipeline 40. Along the direction from the second two-position four-way directional valve 902 to the rod chamber, the third check valve 203 is open. This means that after hydraulic oil flows out of the second two-position four-way directional valve 902, the third check valve 203 does not block the flow, and the hydraulic oil can enter the rod chamber along the first pipeline 30. Along the direction from the rodless chamber to the second two-position four-way directional valve 902, the fourth check valve 204 is open. This means that after hydraulic oil flows out of the second two-position four-way directional valve 902, under the blocking action of the fourth check valve 204, the hydraulic oil cannot enter the rodless chamber along the second pipeline 40.

[0057] After designing as described above:

[0058] When the piston rod hydraulic control system is operating normally, the solenoid a3 of the second two-position four-way directional valve 902 is 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 servo valve 1101 and the second two-position four-way directional valve 902. Since the solenoid a3 of the second two-position four-way directional valve 902 is energized at this time, P3 and B3 are connected, and the hydraulic oil is cut off when it reaches the second check valve 202. By changing the position of the valve core of the servo valve 1101, the direction of the subsequent pipeline is changed, thereby controlling the extension and retraction of the cylinder rod of the hydraulic cylinder 1701.

[0059] When the crystallizer liquid level is found to be too high or too low, or when the cylinder rod is found to be unable to move despite the control of components such as servo valve 1101 to extend and retract, i.e. when the cylinder rod cannot move, the electromagnet a3 of the second two-position four-way directional valve 902 is de-energized, P3 and A3 are connected, and the hydraulic oil reaches the rod chamber of the hydraulic cylinder 1701 through the third check valve 203. The hydraulic oil in the rodless chamber flows back through the second check valve 202, the cylinder rod retracts, thereby driving the stopper rod to block the water inlet.

[0060] In summary, this application, through the design of the emergency circuit, enables the cylinder rod to retract when the main control oil circuit fails and the hydraulic cylinder 1701 cannot operate. This allows the sprue to be blocked by the stopper rod, preventing further injection of molten steel into the tundish. This effectively avoids situations such as uncontrolled molten steel flow and molten steel overflow caused by malfunctions of the servo valve 1101 in the main control oil circuit, thereby improving the safety performance of the stopper rod hydraulic control system.

[0061] like Figure 1 As shown, in some embodiments, the stopcock hydraulic control system further includes a control circuit comprising a first pilot-operated check valve 1001 and a first two-position four-way directional valve 901. The first pilot-operated check valve 1001 is installed on the high-pressure line 10 and is located between the servo valve 1101 and the oil inlet P of the high-pressure line 10. The first two-position four-way directional valve 901 is installed on the high-pressure line 10 and is located between the first pilot-operated check valve 1001 and the oil inlet P of the high-pressure line 10. The control oil circuit of the first pilot-operated check valve 1001 is connected to the first two-position four-way directional valve 901.

[0062] It should be noted that, as Figure 1 As shown, when the control circuit of the first hydraulic check valve 1001 is not connected to the hydraulic oil, the first hydraulic check valve 1001 is disconnected along the direction from the oil inlet P of the high-pressure pipeline 10 to the servo valve 1101. With this design, when the hydraulic oil reaches the first two-position four-way directional valve 901, and the solenoid a1 of the first two-position four-way directional valve 901 is not energized, the P1 port and A1 port of the first two-position four-way directional valve 901 are connected, and the hydraulic oil circuit of the first hydraulic check valve 1001 (…) Figure 1 (The dashed line represents the control oil circuit.) When hydraulic oil is not flowing, the first hydraulically controlled check valve 1001 is open in one direction, and hydraulic oil cannot enter the servo valve 1101. When the solenoid a1 of the first two-position four-way directional valve 901 is energized, the P1 port and B1 of the first two-position four-way directional valve 901 are connected, and the hydraulic oil circuit of the first hydraulically controlled check valve 1001 is connected to hydraulic oil. The first hydraulically controlled check valve 1001 is open in both directions, and the hydraulic oil will pass through the first hydraulically controlled check valve 1001 and enter the servo valve 1101. By controlling the energization of the solenoids a2 and b2 of the servo valve 1101, the direction of the subsequent oil circuit of the servo valve 1101 is changed, thereby controlling the extension and retraction of the cylinder rod of the hydraulic cylinder 1701.

[0063] After designing the control circuit, the first two-position four-way directional valve 901 of the control circuit and the servo valve 1101 of the main control oil circuit combine to control the on / off state of the high-pressure pipeline 10, improving the stability and safety of the piston rod hydraulic control system. In some embodiments, the control circuit further includes a second pilot-operated check valve 1002 and / or a third pilot-operated check valve 1003. The second pilot-operated check valve 1002 is installed in the high-pressure pipeline 10 and is located between the servo valve 1101 and the hydraulic cylinder 1701. The control oil circuit of the second pilot-operated check valve 1002 is connected to the first two-position four-way directional valve 901. The third pilot-operated check valve 1003 is installed in the return oil pipeline 20 and is located between the servo valve 1101 and the hydraulic cylinder 1701. The control oil circuit of the third pilot-operated check valve 1003 is connected to the first two-position four-way directional valve 901.

[0064] The control circuit can be equipped with only the second hydraulic check valve 1002, only the third hydraulic check valve 1003, or both the second hydraulic check valve 1002 and the third hydraulic check valve 1003. It should be noted that, for example... Figure 1 As shown, when the control oil circuit of the second hydraulic check valve 1002 is not connected to hydraulic oil, the second hydraulic check valve 1002 is in passage along the direction from the servo valve 1101 to the hydraulic cylinder 1701; when the control oil circuit of the third hydraulic check valve 1003 is not connected to hydraulic oil, the third hydraulic check valve 1003 is in passage along the direction from the servo valve 1101 to the hydraulic cylinder 1701. The servo valve 1101 is relatively expensive, and its valve core is prone to wear after long-term adjustment, resulting in poor pressure holding performance in the neutral position. The second hydraulic check valve 1002 and / or the third hydraulic check valve 1003 can increase the stability of the stopcock hydraulic control system and help extend the service life of the servo valve 1101.

[0065] In some embodiments, the main control oil circuit further includes a first relief valve 1201 and a second relief valve 1202. Both the first relief valve 1201 and the second relief valve 1202 are installed in the high-pressure line 10 and the return line 20, and are both located between the servo valve 1101 and the hydraulic cylinder 1701. The first relief valve 1201 is used to overflow hydraulic oil in the high-pressure line 10 to the return line 20, and the second relief valve 1202 is used to overflow hydraulic oil in the return line 20 to the high-pressure line 10.

[0066] With this design, when the pressure in the return oil line 20 exceeds the set value, the second relief valve 1202 will open, allowing excess hydraulic oil to flow to the high-pressure line 10, thereby maintaining the stability of the pressure in the return oil line 20; when the pressure in the high-pressure line 10 exceeds the set value, the first relief valve 1201 will open, allowing excess hydraulic oil to flow to the return oil line 20, thereby maintaining the stability of the pressure in the high-pressure line 10. The first relief valve 1201 and the second relief valve 1202 provide overpressure protection for the cylinder.

[0067] In some embodiments, the main control oil circuit further includes a plate ball valve 1501, which is installed between the high-pressure pipeline 10 and the return oil pipeline 20, and is located between the servo valve 1101 and the hydraulic cylinder 1701. With the plate ball valve 1501 installed, when the plate ball valve 1501 is open, the rod chamber and rodless chamber of the hydraulic cylinder 1701 are connected, allowing the position of the cylinder rod to be manually adjusted, facilitating the operator's disassembly and assembly of the stopper rod mechanism, etc.

[0068] In some embodiments, the stopper rod hydraulic control system further includes an energy storage circuit, which includes a third pipeline 50, an accumulator 801, and a pressure relief valve 701. The third pipeline 50 is connected to the high-pressure pipeline 10 and the return oil pipeline 20; the accumulator 801 is installed in the third pipeline 50; and the pressure relief valve 701 is installed in the third pipeline 50 and is located between the accumulator 801 and the return oil pipeline 20.

[0069] In a hydraulic control system, sudden changes in fluid flow within the pipeline can occur due to sudden reversals of servo valve 1101, second two-position four-way directional valve 902, sudden shutdown of the hydraulic pump, or sudden stop of hydraulic cylinder 1701, resulting in impact pressure (oil slugging). This impact pressure can damage various components and sealing devices in the system or cause pipeline rupture. Accumulator 801 can absorb and mitigate this impact pressure, protecting other parts of the system from damage to a certain extent. With pressure relief valve 701 installed, when the pressure in accumulator 801 exceeds its set value, pressure relief valve 701 automatically opens, releasing excess hydraulic fluid into the return oil line 20 to protect accumulator 801 and prevent damage due to excessive pressure.

[0070] In some embodiments, the energy storage circuit further includes a second ball valve 102, which is installed in the third pipeline 50 and located between the accumulator 801 and the high-pressure pipeline 10. With this design, if it is necessary to replace the accumulator 801, deactivate the accumulator 801, or measure the nitrogen pressure inside the accumulator 801, the second ball valve 102 can be closed, thereby disconnecting the third pipeline 50 and the high-pressure pipeline 10.

[0071] In some embodiments, the main control oil circuit further includes a filter 501, which is installed in the high-pressure pipeline 10 and located between the first hydraulic check valve 1001 and the oil inlet P of the high-pressure pipeline 10. The filter 501 can efficiently filter impurities and particulate matter in the hydraulic oil, preventing these impurities from entering components such as the first hydraulic check valve 1001 and causing wear or blockage to the components.

[0072] In some embodiments, the main control oil circuit further includes a differential pressure switch 601, which is installed in the high-pressure pipeline 10 and connected in parallel with the filter 501. The differential pressure switch 601 determines the clogging status of the filter 501 by monitoring the pressure difference of the oil in the high-pressure pipeline 10. When the filter 501 gradually becomes clogged due to the capture of impurities, the pressure difference before and after it increases. Once this pressure difference exceeds the set value of the differential pressure switch 601, the switch will send a signal indicating that the filter 501 needs to be cleaned or replaced, for user convenience.

[0073] In some embodiments, the main control oil circuit further includes a pressure reducing valve 401, which is installed on the high pressure line 10 and the return oil line 20, and is located between the first hydraulic check valve 1001 and the oil inlet P of the high pressure line 10.

[0074] like Figure 1 As shown, ports A and P of pressure reducing valve 401 are connected to high-pressure line 10, and ports Y and T are connected to return oil line 20. Pressure reducing valve 401 can precisely regulate and stabilize the oil pressure in the line, ensuring that the oil remains within the set pressure range as it flows through servo valve 1101 and other downstream components. This helps protect servo valve 1101 and other sensitive components from damage caused by excessive pressure, improving the stability and reliability of the system.

[0075] In some embodiments, the main control oil circuit also includes a cylinder sensor 1702 mounted on the hydraulic cylinder 1701. The cylinder sensor 1702 detects the position of the cylinder rod.

[0076] In some embodiments, the main control oil circuit further includes a first quick connector 1301, a second quick connector 1302, a first hose 1601, and a second hose 1602. The second quick connector 1302 is installed at the connection port of the rodless chamber, and the first hose 1601 is connected to the second quick connector 1302 and the return oil line 20. The first quick connector 1301 is installed at the connection port of the rod chamber, and the second hose 1602 is connected to the first quick connector 1301 and the high-pressure line 10.

[0077] In some embodiments, the main control oil circuit further includes a first pressure relay 1401 and a second pressure relay 1402. The first pressure relay 1401 is installed on the high-pressure line 10 and located between the hydraulic cylinder 1701 and the second hydraulically controlled check valve 1002. The second pressure relay 1402 is installed on the return oil line 20 and located between the hydraulic cylinder 1701 and the third hydraulically controlled check valve 1003. The pressure relays are used to detect pressure and can transmit pressure signals to control modules, etc.

[0078] In some embodiments, the stopper rod hydraulic control system is provided with multiple pressure measuring points to facilitate pressure detection at various locations. For example... Figure 1 As shown, in some embodiments, a first pressure measuring point 301, a second pressure measuring point 302, a third pressure measuring point 303, a fourth pressure measuring point 304, a fifth pressure measuring point 305, a sixth pressure measuring point 306, a seventh pressure measuring point 307, and an eighth pressure measuring point 308 are provided.

[0079] In some embodiments, the main control oil circuit further includes a first ball valve 101 and a first check valve 201. The first ball valve 101 is installed on the high-pressure line 10 and is located between the pressure reducing valve 401 and the oil inlet P of the high-pressure line 10. When the piston rod hydraulic control system needs to stop the oil supply, the first ball valve 101 can be closed. The first check valve 201 is installed on the return line 20 and is located at one end of the return port T of the return line 20. The first check valve 201 is open along the direction from the servo valve 1101 to the return port T.

[0080] 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.

[0081] 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.

[0082] 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 stopper rod hydraulic control system, characterized by, Comprising: including a main control oil circuit and an emergency circuit; The main control oil circuit comprises: a hydraulic cylinder (1701); a high-pressure pipeline (10) having one end in communication with a rod cavity of the hydraulic cylinder (1701); a return oil pipeline (20) having one end in communication with a rodless cavity of the hydraulic cylinder (1701); a servo valve (1101) installed on the high-pressure pipeline (10) and the return oil pipeline (20); The emergency circuit comprises: a second two-position four-way directional valve (902) installed on the high-pressure pipeline (10) and the return oil pipeline (20); a first pipeline (30) having one end in communication with the second two-position four-way directional valve (902) and the other end in communication with the rod cavity of the hydraulic cylinder (1701); a second pipeline (40) having one end in communication with the second two-position four-way directional valve (902) and the other end in communication with the rodless cavity of the hydraulic cylinder (1701); a third check valve (203) installed on the first pipeline (30) and in a direction from the second two-position four-way directional valve (902) to the rod cavity, the third check valve (203) being conductive; a fourth check valve (204) installed on the second pipeline (40) and in a direction from the rodless cavity to the second two-position four-way directional valve (902), the fourth check valve (204) being conductive.

2. A hydraulic control system for a stopper rod according to claim 1, wherein The plug hydraulic control system further comprises a control circuit, and the control circuit comprises: a first hydraulic control check valve (1001) installed on the high-pressure pipeline (10) and located between the servo valve (1101) and an oil inlet P of the high-pressure pipeline (10); a first two-position four-way directional valve (901) installed on the high-pressure pipeline (10) and located between the first hydraulic control check valve (1001) and the oil inlet P of the high-pressure pipeline (10); The control oil circuit of the first hydraulic control check valve (1001) is connected to the first two-position four-way directional valve (901).

3. A hydraulic control system for a stopper rod according to claim 2, wherein The control circuit further comprises: a second hydraulic control check valve (1002) installed on the high-pressure pipeline (10) and located between the servo valve (1101) and the hydraulic cylinder (1701), the control oil circuit of the second hydraulic control check valve (1002) being connected to the first two-position four-way directional valve (901); and / or, a third hydraulic control check valve (1003) installed on the return oil pipeline (20) and located between the servo valve (1101) and the hydraulic cylinder (1701), the control oil circuit of the third hydraulic control check valve (1003) being connected to the first two-position four-way directional valve (901).

4. A hydraulic control system for a stopper rod according to any one of claims 1-3, characterized in that, The main control oil circuit further comprises: a first overflow valve (1201) installed on the high-pressure pipeline (10) and the return oil pipeline (20) and located between the servo valve (1101) and the hydraulic cylinder (1701), the first overflow valve (1201) being used for overflowing hydraulic oil in the high-pressure pipeline (10) to the return oil pipeline (20); A second overflow valve (1202) is installed on the high-pressure pipeline (10) and the oil return pipeline (20) and is located between the servo valve (1101) and the hydraulic cylinder (1701), and is used to overflow the hydraulic oil in the oil return pipeline (20) to the high-pressure pipeline (10).

5. A hydraulic control system for a stopper rod according to any one of claims 1-3, characterized in that, The main control oil circuit further comprises a plate ball valve (1501) installed on the high-pressure pipeline (10) and the oil return pipeline (20) and located between the servo valve (1101) and the hydraulic cylinder (1701).

6. A hydraulic control system for a stopper rod according to any one of claims 1-3, characterized in that, The plug hydraulic control system further comprises an energy storage circuit, and the energy storage circuit comprises: A third pipeline (50) is connected to the high-pressure pipeline (10) and the oil return pipeline (20); An energy accumulator (801) is installed on the third pipeline (50); A pressure relief valve (701) is installed on the third pipeline (50) and located between the energy accumulator (801) and the oil return pipeline (20).

7. A hydraulic control system for a stopper rod according to claim 6, wherein The energy storage circuit further comprises a second ball valve (102) installed on the third pipeline (50) and located between the energy accumulator (801) and the high-pressure pipeline (10).

8. A hydraulic control system for a stopper rod according to any one of claims 1-3, characterized in that, The main control oil circuit further comprises a filter (501) installed on the high-pressure pipeline (10), and the filter (501) is located between the first hydraulic control check valve (1001) and the oil inlet P of the high-pressure pipeline (10).

9. A hydraulic control system for a stopper rod according to claim 8, wherein The main control oil circuit further comprises a differential pressure switch (601) installed on the high-pressure pipeline (10) and arranged in parallel with the filter (501).

10. A hydraulic control system for a stopper rod according to any one of claims 1-3, characterized in that, The main control oil circuit further comprises a pressure reducing valve (401) installed on the high-pressure pipeline (10) and the oil return pipeline (20), and the pressure reducing valve (401) is located between the first hydraulic control check valve (1001) and the oil inlet P of the high-pressure pipeline (10).

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