A method for realizing online adjustment of pressure balance of hydraulic cylinder of fan-shaped segment frame of continuous casting machine

Abstract

The present application relates to a kind of online adjustment method for realizing the pressure balance of continuous casting machine fan segment frame hydraulic cylinder, if the pressure difference between the hydraulic cylinder with the minimum closing pressure of the largest hydraulic cylinder in fan segment is greater than the set value one, or the pressure difference between the outlet closing pressure of certain fan segment and the inlet closing pressure of adjacent fan segment is greater than the set value two, it is considered that the hydraulic cylinder pressure is unbalanced, and the fan segment roll gap needs to be adjusted online.The advantages of the present application are: without stopping, the fan segment roll gap is adjusted online, the modified position sensor deviation HMI correction position is assigned to the actual correction value of current position sensor deviation, the actual roll gap of fan segment will change, the position reference value of four hydraulic cylinders of fan segment is online adjustable, and the problem of unbalanced hydraulic cylinder pressure of fan segment frame caused by inaccurate position reference value of fan segment position sensor or abnormal inlet opening and outlet opening of fan segment is avoided.

Description

Technical Field

[0001] This invention relates to the field of continuous casting in the metallurgical industry, and in particular to a method for online adjustment of the pressure balance of the hydraulic cylinder of the sector section frame of a continuous casting machine. Background Technology

[0002] The sector section of a continuous casting machine is used to limit the thickness of the slab during solidification by extrusion, making the slab less prone to deformation and effectively controlling its thickness. Due to the need for continuous production, continuous casting machines cannot be frequently shut down. During casting, the roll gap of the sector section is measured by a sector section position sensor. If the roll gap measurement is inaccurate, the pressure of the four hydraulic cylinders in the sector section will be uneven, resulting in an imbalance in the closing pressure of the four hydraulic cylinders. This can cause significant damage to the sector section equipment. When the slab is subjected to unbalanced forces, product quality problems such as bulging and center segregation may occur. Summary of the Invention

[0003] The purpose of this invention is to provide a method for online adjustment of the hydraulic cylinder pressure balance of the sector segment frame in a continuous casting machine. The roll gap of the sector segment is adjusted online on the HMI sector segment monitoring window, which improves the reliability of the online sector segment opening degree and ensures product quality.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A method for online adjustment of hydraulic cylinder pressure balance in the sector section frame of a continuous casting machine is based on the HMI sector section monitoring window. If the pressure difference between the hydraulic cylinder with the highest closing pressure and the hydraulic cylinder with the lowest closing pressure within the sector section is greater than a set value one, or if the difference between the outlet closing pressure of a certain sector section and the inlet closing pressure of an adjacent sector section is greater than a set value two, it is considered that the hydraulic cylinder pressure is unbalanced, requiring online adjustment of the sector section roll gap. The method specifically includes the following steps:

[0006] S1. Enter the roll gap adjustment screen, select the sector segment, observe the roll gap of the sector segment, and manually input the position sensor deviation HMI correction offset as the position sensor deviation HMI correction offset for this time.

[0007] S2. Click the activation button one, add the current position sensor deviation HMI correction offset to the current position sensor deviation HMI correction position as the modified position sensor deviation HMI correction position, and then set the current position sensor deviation HMI correction offset to zero, while keeping the fan-shaped section roll gap unchanged.

[0008] S3. Click the second activation button to assign the modified position sensor deviation HMI correction position to the current position sensor deviation actual correction value. The actual roll gap of the sector segment will change.

[0009] S4. If the hydraulic cylinder pressure in the sector segment is unbalanced, repeat steps S1 to S3.

[0010] When the input position sensor deviation HMI correction offset is positive, the sector segment closes at a set distance; when the input position sensor deviation HMI correction offset is negative, the sector segment opens at a set distance.

[0011] The system comprises several sector segments, each including a hydraulic cylinder, a sector segment frame, a position sensor, a servo valve, a proportional valve, an upper chamber pressure sensor, and a lower chamber pressure sensor. The hydraulic cylinders include an inlet hydraulic cylinder and an outlet hydraulic cylinder, each equipped with a position sensor. The position sensors are used to detect the position of the inlet and outlet openings of the sector segment. The upper chamber pressure sensors are used to detect the inlet closing pressure and outlet closing pressure of the sector segment, respectively. The lower chamber pressure sensor is used to detect the lifting pressure of the upper frame. The sector segment frame includes an upper frame and a lower frame. The upper frame is connected to the piston of the hydraulic cylinder, and the lower frame is connected to the base of the hydraulic cylinder.

[0012] The servo valve is used to control the oil intake of the upper chamber of the inlet and outlet hydraulic cylinders. By adjusting the servo valve, the pistons of the inlet and outlet hydraulic cylinders are driven to move. The inlet and outlet openings of the sector section are changed by adjusting the upper frame. The proportional valve is used to control the oil intake of the lower chamber of the inlet and outlet hydraulic cylinders. The upper frame is lifted by adjusting the proportional valve.

[0013] The inlet hydraulic cylinder and the outlet hydraulic cylinder are respectively set on both sides of the sector-shaped frame. There are two inlet hydraulic cylinders and two outlet hydraulic cylinders. The upper chamber pressure sensor, the lower chamber pressure sensor, the servo valve, and the proportional valve are set in the hydraulic station. There are four upper chamber pressure sensors, one lower chamber pressure sensor, four servo valves, and one proportional valve.

[0014] The upper frame, lower frame, upper chamber of the hydraulic cylinder, and lower chamber of the hydraulic cylinder are located on the sector segment.

[0015] The first setting is 30 to 100 tons, and the second setting is 30 to 100 tons.

[0016] The distance setting ranges from -5mm to +5mm.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] The HMI sector segment monitoring window enables online adjustment of the sector segment pressure. If the pressure difference between the hydraulic cylinder with the highest closing pressure and the hydraulic cylinder with the lowest closing pressure within a sector segment exceeds a set value one, or if the difference between the outlet closing pressure of a sector segment and the inlet closing pressure of an adjacent sector segment exceeds a set value two, it is considered a hydraulic cylinder pressure imbalance. Without stopping the machine, the sector segment roll gap is adjusted online. The modified position sensor deviation HMI correction position is assigned to the current position sensor deviation actual correction value, changing the actual roll gap of the sector segment. This allows for online adjustment of the position reference values ​​of the four hydraulic cylinders in the sector segment, avoiding pressure imbalance in the sector segment frame hydraulic cylinders caused by inaccurate position reference values ​​of the sector segment position sensors or abnormal inlet and outlet openings of the sector segment. This improves the reliability of online sector segment opening and ensures product quality. Attached Figure Description

[0019] Figure 1 This is a front view of the sector-shaped structure of a continuous casting machine. Figure 1 .

[0020] Figure 2 This is a front view of the sector-shaped structure of a continuous casting machine. Figure 2 .

[0021] Figure 3 This is a top view of the schematic structure of the sector section of a continuous casting machine.

[0022] Figure 4 This is the HMI monitoring screen for adjusting the roller gap in the fan-shaped section.

[0023] Figure 5 This is the second HMI monitoring screen for adjusting the roller gap in the fan-shaped section.

[0024] Figure 6 This is the third HMI monitoring screen for adjusting the roller gap in the fan-shaped section.

[0025] Figure 7 This is the fourth HMI monitoring screen for adjusting the roller gap in the fan-shaped section.

[0026] Figure 8 This is the fifth HMI monitoring screen for adjusting the roller gap in the fan-shaped section.

[0027] Figure 9 This is the sixth HMI monitoring screen for adjusting the roller gap in the fan-shaped section.

[0028] Figure 10 This is screen seven of the HMI monitoring interface for adjusting the roller gap in the fan-shaped section.

[0029] Figure 11 This is the process of modifying and correcting deviation values ​​in the implementation image. Figure 1 .

[0030] Figure 12 This is the process of modifying and correcting deviation values ​​in the implementation image. Figure 2 .

[0031] Figure 13 This is the process of modifying and correcting deviation values ​​in the implementation image. Figure 3 .

[0032] Figure 14 This is a schematic diagram of the calibration reference position of the sector segment in the embodiment. Figure 1 .

[0033] Figure 15 This is a schematic diagram of the calibration reference position of the sector segment in the embodiment. Figure 2

[0034] Figure 16 This is a schematic diagram of the calibration reference position of the sector segment in the embodiment. Figure 3 .

[0035] Figure 17 This is a schematic diagram of the calibration reference position of the sector segment in the embodiment. Figure 4 .

[0036] Figure 18 This is the HMI monitoring screen for adjusting the roller gap in the sector section of the embodiment.

[0037] Figure 19 This is the second HMI monitoring screen for adjusting the roller gap in the sector section of the embodiment.

[0038] Figure 20 This is the third HMI monitoring screen for adjusting the roller gap in the sector section of the embodiment.

[0039] Figure 21 This is the fourth HMI monitoring screen for adjusting the roller gap in the sector section of the embodiment.

[0040] Figure 22 This is a schematic diagram of the setting value given by the process for the opening degree of the sector segment. Figure 1 .

[0041] Figure 23 This is a schematic diagram of the setting value given by the process for the opening degree of the sector segment. Figure 2 .

[0042] Figure 24 This is a simplified diagram for calculating the position of the sector segment.

[0043] In the diagram: 1-Left inlet position sensor; 2-Right inlet position sensor; 3-Upper frame; 4-Left inlet hydraulic cylinder upper chamber servo valve; 5-Right inlet hydraulic cylinder upper chamber servo valve; 6-Lower chamber proportional valve; 7-Hydraulic cylinder upper chamber; 8-Hydraulic cylinder lower chamber; 9-Left inlet pressure sensor; 10-Lifting frame pressure sensor; 11-Right inlet pressure sensor; 12-Lower frame. Detailed Implementation

[0044] The present invention will now be described in detail with reference to the accompanying drawings, but it should be noted that the implementation of the present invention is not limited to the following embodiments.

[0045] See Figure 1 ~See Figure 3 The single-strand casting machine has fifteen sector sections, while the twin-strand casting machine has thirteen. Each sector section includes an inlet hydraulic cylinder, an outlet hydraulic cylinder, a sector section frame, a position sensor, a servo valve, a proportional valve, an upper chamber pressure sensor, and a lower chamber pressure sensor. The inlet and outlet hydraulic cylinders are respectively located on both sides of the sector section frame. The sector section frame includes an upper frame and a lower frame. The lower frame is fixedly connected to the base of the inlet and outlet hydraulic cylinders and does not move. The upper frame is connected to the pistons of the inlet and outlet hydraulic cylinders. There are two inlet and two outlet hydraulic cylinders. The servo valve is used to control the oil intake of the upper chamber of the inlet and outlet hydraulic cylinders. By adjusting the servo valve, the pistons of the inlet and outlet hydraulic cylinders move, which in turn moves the upper frame. Adjusting the upper frame changes the inlet opening and outlet opening of the sector section. The system includes four servo valves for detecting the opening degree of the inlet and outlet hydraulic cylinders. Position sensors are installed in both the inlet and outlet hydraulic cylinders to detect the position of the inlet and outlet opening degrees of the sector segment. Four upper chamber pressure sensors are installed on the hydraulic station valve platform to detect the inlet and outlet closing pressures of the sector segment. One proportional valve controls the oil flow into the lower chambers of the inlet and outlet hydraulic cylinders, lifting the upper frame. One lower chamber pressure sensor detects the pressure required to lift the upper frame. The upper chamber pressure sensors, lower chamber pressure sensors, servo valves, and proportional valves are all located within the hydraulic station. The upper frame, lower frame, upper chambers of the hydraulic cylinders, and lower chambers of the inlet and outlet hydraulic cylinders are located on the sector segment.

[0046] See Figure 4 ~See Figure 10 A method for online adjustment of hydraulic cylinder pressure balance in the sector section frame of a continuous casting machine is proposed, based on the HMI sector section pressure monitoring window. If the pressure difference between the hydraulic cylinder with the highest closing pressure and the hydraulic cylinder with the lowest closing pressure within the sector section exceeds 50 tons, see [link to relevant documentation]. Figure 6 Or, the closing pressure of a certain sector segment is unbalanced with that of an adjacent sector segment, see... Figure 8 ,See Figure 9 For example, if the difference between the right outlet closing pressure of sector S8 and the right inlet closing pressure of sector S9 is greater than 50 tons, it is considered that the hydraulic cylinder pressure is unbalanced and the sector roll gap needs to be adjusted online. The specific steps include:

[0047] Step S1: Enter the roll gap adjustment screen, see... Figure 5Click the button S01 POS MODIFY---S15 POS MODIFY to enter the corresponding sector segment, see Figure 6 And observe the position of the roll gap in the fan-shaped section, see Figure 7 Manually input the position sensor deviation HMI correction offset as the position sensor deviation HMI correction offset for this time. Sensor offset HMI wirtePos is used to input the adjustment value of the roll gap of the sector segment. If you want the sector segment to open by 1mm, then Sensor offset HMI wirtePos (position sensor deviation HMI correction offset) = -1. If you want the sector segment to close by 1mm, then Sensor offset HMI wirtePos (position sensor deviation HMI correction offset) = +1.

[0048] Step S2: Click the MODI START button. Add the current position sensor deviation HMI correction offset to the current position sensor deviation HMI correction position to obtain the modified position sensor deviation HMI correction position, as shown in Formula ① below:

[0049] Senor offset HMI calcul pos.=

[0050] Senor offset HMI calcul pos.+Sensor offset HMI wirte Pos.①

[0051] In formula ①, Senor offset HMI calcul pos. represents the position of the HMI correction due to the position sensor offset, and Sensor offset HMI wirte Pos. represents the offset amount of the HMI correction due to the position sensor offset.

[0052] Then, the offset of the position sensor deviation HMI correction is set to zero, as shown in Formula ②, as follows:

[0053] Sensor offset HMI wirte Pos.=0; ②

[0054] In Formula ②, Sensor offset HMI wirte Pos. represents the offset amount of the position sensor deviation HMI correction;

[0055] The position of the roll gap in the sector remains unchanged;

[0056] Step S3: Click the CONF START button to assign the modified position sensor deviation HMI correction position to the current actual position sensor offset, as shown in formula ③ below:

[0057] Sensor offset actual reading.=Senor offset HMI calcul pos.; ③

[0058] In formula ③, "Sensor offset actual reading" represents the actual correction value of the position sensor offset, and "Senor offset HMI calcul pos" represents the position sensor offset HMI correction position.

[0059] The actual roll gap in the sector segment will change;

[0060] Step S4: If the hydraulic cylinder pressure in the sector segment is unbalanced, repeat steps S1 to S3.

[0061] The work process is described as follows:

[0062] See Figure 4 ~See Figure 10 In the figure, POS MODIFY represents the sector segment, Position represents the roll gap of the sector segment, Sensoroffset HMI wirte Pos represents the offset of the position sensor offset HMI correction, Senor offset HMI calculpos represents the position of the position sensor offset HMI correction, Sensor offset actual reading represents the actual correction value of the position sensor offset, and Last sensor offset calibration represents the actual offset of the position sensor when the sector segment is finally calibrated.

[0063] The adjustment principles for the sector segments are as follows: the closing pressure of sector segments S01 to S06 should not be less than 40 tons; the closing force of sector segments S11 to S15 should not exceed 30 tons; the closing force of sector segments S07 to S08 should not be less than 50 tons and should not exceed 90 tons; the offset of each position sensor deviation HMI correction should be between -1 and +1.

[0064] The position reference value is the actual offset of the position sensor when the sector segment is finally calibrated. After the new sector segment is online, the upper frame of the sector segment needs to be pressed down with the maximum closing force. The value of the sector segment position sensor is then the position reference value.

[0065] If the servo valve opening increases, oil enters the upper chambers of the inlet and outlet hydraulic cylinders, the upper frame depresses, and the inlet and outlet openings of the sector segment decrease. The pressure sensor in the upper chamber detects the closing pressure, at which point the sector segment is closed. If the servo valve opening decreases, the proportional valve opening increases, oil enters the lower chambers of the inlet and outlet hydraulic cylinders, the upper frame rises, and the inlet and outlet openings increase. The pressure sensor in the lower chamber detects the lifting pressure, at which point the sector segment opens. The sector segment opening setting value (i.e., the target opening value of the sector segment) is given according to the production process, see [link to relevant documentation]. Figure 22 ,See Figure 23 During continuous casting machine production, operators may notice an imbalance in the closing pressure of a hydraulic cylinder at a certain position within a sector section through the monitoring window. Timely online adjustments should be made to ensure that the pressure difference between adjacent hydraulic cylinders does not exceed 50 tons, thus preventing pressure imbalance.

[0066] The following embodiments are implemented based on the technical solution of the present invention, providing detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments. Unless otherwise specified, the methods used in the following embodiments are conventional methods.

[0067]

Example 1

[0068] A method for achieving online pressure balance adjustment of the hydraulic cylinders in the sector section frame of a continuous casting machine includes the following steps:

[0069] Step S1: Close the sector segment by 1mm. Enter 1 in the Sensor offset HMI wire Pos. box. See [link / reference]. Figure 18 , Sensor offset HMI wirte Pos.=1;

[0070] Step S2: Click the MODI START button, and pass the modified value Senor offset HMI calcul pos. + Senor offset HMI wirte Pos. to Senor offset HMI calcul pos. See Figure 19 , Senoroffset HMI calcul pos.=Senor offset HMI calcul pos.+Sensor offset HMI wirtePos.=434.0+1=435.0;

[0071] Step S3: Click the CONF START button to assign the Senor offset HMI calcul pos. to the Sensor offset actual reading. Simultaneously, the program determines the actual position. (See...) Figure 18 231.6 is the actual position, which is the actual opening of the sector segment. The target position is the position set according to the process requirements, which is the target opening of the sector segment. The target position is 231.6. If the actual position of the sector segment is 232.6, it needs to be closed.

[0072] The work process is described as follows:

[0073] See Figure 21 When the sector segment is in a shutdown maintenance state, the calibrated reference position of the sector segment is 387.2mm, see... Figure 14 In the casting state, the target position of the sector segment is 242.5mm, and the actual opening position is 242.5mm. (See...) Figure 15 During casting, the pressure of the hydraulic cylinder is too low, requiring a reduction in the position of the hydraulic cylinder in the sector segment. Since the target position is not differentiated by left or right and is determined by the production process, modification is not feasible. Therefore, the position of a single hydraulic cylinder needs to be changed. This requires online modification of the sector segment calibration reference value. For example, if a 1mm reduction is needed, the original reference value of 387.2mm needs to be increased by 1mm, becoming 388.2mm. See [link / details]. Figure 16 The actual value changed from 242.5mm to 243.5mm, but the target value remained 242.5mm. The hydraulic cylinder position needs to be closed from 243.5mm to 242.5mm, and the pressure of the hydraulic cylinder will increase accordingly, thus achieving the purpose of adjusting the hydraulic cylinder pressure. See [link / details]. Figure 17 .

[0074]

Example 2

[0075] In this embodiment, a method for online adjustment of hydraulic cylinder pressure balance of sector segment frame of continuous casting machine is the same as in embodiment 1, but with the addition of a process of modifying the position of sector segment by modifying the reference value of sector segment position.

[0076] See Figure 11 ~See Figure 13 The position of the sector segment's inlet and outlet (i.e., the sector segment's opening degree) can be modified by changing the correction deviation value at the sector segment's inlet or outlet. See [link / reference]. Figure 24 The formula is shown below:

[0077] A=(X1+X2)*P1 / X2-X1*P2 / X2; ④

[0078] B=(X2+X3)*P2 / X2-X3*P1 / X2; ⑤

[0079] In formulas ④ and ⑤, A: right-side inlet position of the sector segment; B: right-side outlet position of the sector segment; C: right-side inlet position sensor reading of the sector segment; D: right-side outlet position sensor reading of the sector segment; E: right-side inlet position correction deviation value of the sector segment; F: right-side outlet position correction deviation value of the sector segment; X1: distance from the right-side inlet of the sector segment to the right-side inlet hydraulic cylinder of the sector segment; X2: distance from the right-side inlet hydraulic cylinder of the sector segment to the right-side outlet hydraulic cylinder of the sector segment; X3: distance from the right-side outlet hydraulic cylinder of the sector segment to the right-side outlet of the sector segment; P1: process variable 1; P2: process variable 2; P1 = C + E; P2 = D + F.

[0080] This invention is based on the HMI sector segment monitoring window. Without stopping the machine, the sector segment roll gap can be adjusted online. The modified position sensor deviation HMI correction position is assigned to the current position sensor deviation actual correction value, and the actual roll gap of the sector segment will change. This enables the position reference value of the four hydraulic cylinders of the sector segment to be adjusted online. It avoids the problem of unbalanced hydraulic cylinder pressure in the sector segment frame caused by inaccurate position reference value of the sector segment position sensor or abnormal inlet and outlet opening of the sector segment. This improves the reliability of the online sector segment opening and ensures product quality.

Claims

1. A method for online adjustment of hydraulic cylinder pressure balance in the sector section frame of a continuous casting machine, based on the HMI sector section monitoring window, characterized in that... If the pressure difference between the hydraulic cylinder with the highest closing pressure and the hydraulic cylinder with the lowest closing pressure within a sector segment is greater than a set value one, or if the pressure difference between the outlet closing pressure of a certain sector segment and the inlet closing pressure of an adjacent sector segment is greater than a set value two, it is considered that the hydraulic cylinder pressure is unbalanced and the sector segment roll gap needs to be adjusted online. The specific steps include: S1. Enter the roll gap adjustment screen, select the sector segment, observe the roll gap of the sector segment, and manually input the position sensor deviation HMI correction offset as the position sensor deviation HMI correction offset for this time. S2. Click the activation button one, add the current position sensor deviation HMI correction offset to the current position sensor deviation HMI correction position as the modified position sensor deviation HMI correction position, and then set the current position sensor deviation HMI correction offset to zero, while keeping the fan-shaped section roll gap unchanged. S3. Click the second activation button to assign the modified position sensor deviation HMI correction position to the current position sensor deviation actual correction value. The actual roll gap of the sector segment will change. S4. If the hydraulic cylinder pressure of the sector segment is unbalanced, repeat steps S1 to S3. The positions of the sector segment's inlet and outlet can be modified by altering the correction deviation values ​​at the inlet or outlet, as shown in the following formula: A = (X1 + X2) * P1 / X2 - X1 * P2 / X2; B = (X2 + X3) * P2 / X2 - X3 * P1 / X2; Wherein, A: Right inlet position of the sector segment; B: Right outlet position of the sector segment; C: Right inlet position sensor reading of the sector segment; D: Right outlet position sensor reading of the sector segment; E: Right inlet position correction deviation value of the sector segment; F: Right outlet position correction deviation value of the sector segment; X1: Distance from the right inlet of the sector segment to the right inlet hydraulic cylinder of the sector segment; X2: Distance from the right inlet hydraulic cylinder of the sector segment to the right outlet hydraulic cylinder of the sector segment; X3: Distance from the right outlet hydraulic cylinder of the sector segment to the right outlet of the sector segment. P1: Process variable 1; P2: Process variable 2; P1 = C + E; P2 = D + F; The first setpoint is 30~100 t, and the second setpoint is 30~100 t.

2. The method for online adjustment of hydraulic cylinder pressure balance in a sector-shaped frame of a continuous casting machine according to claim 1, characterized in that, When the input position sensor deviation HMI correction offset is positive, the sector segment closes at a set distance; when the input position sensor deviation HMI correction offset is negative, the sector segment opens at a set distance.

3. The method for online adjustment of hydraulic cylinder pressure balance in a sector-shaped frame of a continuous casting machine according to claim 1, characterized in that, The number of sector segments is several, and each sector segment includes a hydraulic cylinder, a sector segment frame, a position sensor, a servo valve, a proportional valve, an upper chamber pressure sensor, and a lower chamber pressure sensor. The hydraulic cylinder includes an inlet hydraulic cylinder and an outlet hydraulic cylinder. Each hydraulic cylinder is equipped with a position sensor, which is used to detect the position of the inlet opening and the outlet opening of the sector segment. The upper chamber pressure sensor is used to detect the inlet closing pressure and the outlet closing pressure of the sector segment, respectively. The lower chamber pressure sensor is used to detect the lifting pressure of the upper frame. The sector segment frame includes an upper frame and a lower frame. The upper frame is connected to the piston of the hydraulic cylinder, and the lower frame is connected to the base of the hydraulic cylinder. The servo valve is used to control the oil intake of the upper chamber of the inlet and outlet hydraulic cylinders. By adjusting the servo valve, the pistons of the inlet and outlet hydraulic cylinders are driven to move. The inlet and outlet openings of the sector section are changed by adjusting the upper frame. The proportional valve is used to control the oil intake of the lower chamber of the inlet and outlet hydraulic cylinders. The upper frame is lifted by adjusting the proportional valve.

4. The method for online adjustment of hydraulic cylinder pressure balance in a sector-shaped frame of a continuous casting machine according to claim 3, characterized in that, The inlet hydraulic cylinder and outlet hydraulic cylinder are respectively set on both sides of the sector-shaped frame, with two inlet hydraulic cylinders and two outlet hydraulic cylinders. The upper chamber pressure sensor, lower chamber pressure sensor, servo valve, and proportional valve are set in the hydraulic station, with four upper chamber pressure sensors, one lower chamber pressure sensor, four servo valves, and one proportional valve.

5. The method for online adjustment of hydraulic cylinder pressure balance in a sector-shaped frame of a continuous casting machine according to claim 3, characterized in that, The upper frame, lower frame, upper cavity of the hydraulic cylinder, and lower cavity of the hydraulic cylinder are arranged on the sector segment.

6. The method for online adjustment of hydraulic cylinder pressure balance in a sector-shaped frame of a continuous casting machine according to claim 2, characterized in that, The specified distance is -5mm to +5mm.

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