Crystallizer online thermal width adjustment device and method

Abstract

The present invention provides a device and method for online thermal width adjustment of a crystallizer, wherein the device includes a joint mechanism connected to the crystallizer, an actuator connected to the joint mechanism, and a PLC automatic control system connected to the actuator. The actuator is provided with a displacement sensor assembly, which is used to detect the position of the joint mechanism and output it to the PLC automatic control system; the PLC automatic control system is used to issue instructions to the actuator based on data detected by the displacement sensor assembly; the actuator is used to act on the joint mechanism based on the instructions received from the PLC automatic control system, and drive the crystallizer to move, thereby achieving position adjustment of the crystallizer. The present invention can solve the problem of steel leak accidents caused by mechanical clearance causing the taper to decrease during online thermal width adjustment of the existing crystallizer.

Description

Technical Field

[0001] The present invention relates to the technical field of steelmaking and continuous casting in the metallurgical industry, and more particularly to an on-line thermal width adjustment device and method for a crystallizer. Background Art

[0002] To meet market demand, continuous casting production is increasingly adopting online thermal mold width adjustment technology. Because current mold width adjustment systems are mechatronic, errors caused by mechanical backlash are unavoidable, manifesting in production as changes in the mold width adjustment device's taper.

[0003] To overcome the problem of reduced mold taper during online thermal width adjustment, most current methods employ electronic compensation: Before pouring begins, the taper is measured with a taper meter, and the taper compensation amount is manually increased or decreased on the control screen to meet the required taper accuracy. This method can meet the required taper accuracy before continuous casting begins. However, after pouring begins, as molten steel is injected into the mold, errors caused by mechanical backlash begin to take effect. This effect is particularly pronounced if the width of the resulting ingot changes. Once the taper decreases, the gap between the mold cooling copper plate and the molten steel inside the mold increases, increasing the risk of leaks.

[0004] In order to solve the above problems, it is urgent to provide a crystallizer online thermal width adjustment device and method. Summary of the Invention

[0005] In view of the above problems, the purpose of the present invention is to provide a device and method for online thermal width adjustment of a crystallizer to solve the problem of steel leakage accidents caused by the reduction of taper due to mechanical gap during online thermal width adjustment of the existing crystallizer.

[0006] The crystallizer online thermal width adjustment device provided by the present invention comprises a joint mechanism connected to the crystallizer, an actuator connected to the joint mechanism, and a PLC automatic control system connected to the actuator, wherein:

[0007] A displacement sensor assembly is provided in the actuator, and the displacement sensor assembly is used to detect the position of the joint mechanism and output it to the PLC automatic control system;

[0008] The PLC automatic control system is used to issue instructions to the actuator according to the data detected by the displacement sensor component;

[0009] The actuator is used to act on the joint mechanism according to the instructions received from the PLC automatic control system, and drive the crystallizer to move, thereby achieving position adjustment of the crystallizer.

[0010] In addition, a preferred solution is that the joint mechanism includes an upper joint arranged at the upper end of the crystallizer and a lower joint arranged at the lower end of the crystallizer.

[0011] In addition, a preferred solution is that the actuator includes an upper actuator connected to the upper joint and a lower actuator connected to the lower joint;

[0012] The displacement sensor assembly includes an upper displacement sensor and a lower displacement sensor.

[0013] In addition, a preferred solution is that the upper displacement sensor is provided in the upper actuator to detect the position of the upper joint and send the detected position information to the PLC automatic control system;

[0014] The lower displacement sensor is arranged in the lower actuator, and is used to detect the position of the lower joint and send the detected position information to the PLC automatic control system.

[0015] The present invention also provides a crystallizer online thermal width adjustment method, which uses the above-mentioned crystallizer online thermal width adjustment device to adjust the crystallizer. The method is specifically as follows:

[0016] When the crystallizer is in an initial state, performing an initial calibration on the crystallizer to obtain an initial upper joint position actual value of an upper joint corresponding to an upper end of the crystallizer, and an initial lower joint position actual value of a lower joint corresponding to a lower end of the crystallizer;

[0017] Comparing the initial upper joint position actual value and the initial lower joint position actual value with the upper joint preset position value and the lower joint preset position value respectively;

[0018] According to the comparison result, the upper joint and the lower joint are moved to the upper joint preset position and the lower joint preset position respectively;

[0019] When the upper joint and the lower joint are moved to the upper joint preset position and the lower joint position respectively, the upper joint and the lower joint continue to move respectively by the distance of the upper joint gap value and the distance of the lower joint gap value;

[0020] After the upper joint moves the distance of the upper joint gap value and the lower joint moves the distance of the lower joint gap value, the crystallizer is calibrated for the second time to obtain the current upper joint position actual value of the upper joint corresponding to the upper end of the crystallizer and the current lower joint position actual value of the lower joint corresponding to the lower end of the crystallizer;

[0021] According to the current upper joint position value and the current joint position value, the upper joint and the lower joint are moved to the target position to realize the online thermal regulation of the crystallizer.

[0022] In addition, a preferred solution is that the formula for the actual value of the initial upper joint position is:

[0023] ActPosTop1=PosTop1

[0024] Among them, ActPosTop1 represents the initial upper joint position value, and PosTop1 represents the initial reading joint position value of the upper joint;

[0025] The formula for the actual value of the initial lower joint position is:

[0026] ActPosBtm1=PosBtm1

[0027] Among them, ActPosBtm1 represents the actual value of the initial lower joint position, and PosBtm1 represents the initial reading joint position value of the lower joint.

[0028] In addition, the preferred solution is that the formula for initial calibration of the taper value is:

[0029] Tap1=f1(ActPosTop1, ActPosBtm1)

[0030] Among them, Tap1 represents the initial calibration taper value; f1 represents the functional relationship between ActPosTop1 and ActPosBtm1.

[0031] In addition, a preferred solution is that the joint gap value includes the upper joint gap value and the lower joint gap value, and when the joint moves from static to moving, the joint gap value slowly transitions from zero to a maximum value, and when the joint moves from moving to static, the joint gap value slowly transitions from the maximum value to zero.

[0032] Furthermore, a preferred solution is to obtain the upper joint gap value and the lower joint gap value through initial calibration;

[0033] The formula for the actual value of the current upper joint position is:

[0034] ActPosTop2=PosTop2+GapTop

[0035] Among them, ActPosTop2 represents the actual value of the current upper joint position, PosTop2 represents the current reading joint position value of the upper joint, and GapTop represents the upper joint gap;

[0036] The formula for the actual value of the current lower joint position is:

[0037] ActPosBtm2=PosBtm2-GapBtm

[0038] Among them, ActPosBtm2 represents the actual value of the current lower joint position, PosBtm2 represents the current reading joint position value of the lower joint, and GapBtm represents the lower joint gap.

[0039] In addition, the preferred solution is that the formula for the secondary calibration taper value is:

[0040] Tap2=f1(ActPosTop2, ActPosBtm2)

[0041] Among them, Tap2 represents the secondary calibration taper value; f1 represents the functional relationship between ActPosTop2 and ActPosBtm2.

[0042] From the above technical solutions, it can be seen that the crystallizer online thermal width adjustment device and method provided by the present invention can achieve the following beneficial effects compared with the prior art:

[0043] 1) Each time the mold moves from motion to rest, it forms a spatial posture of up-inside-down-outside, and the taper value is the minimum, thus overcoming the increase in taper value caused by mechanical clearance;

[0044] 2) The taper value corresponding to the spatial posture of the upper inner, lower outer of the crystallizer eliminates the mechanical gap, that is, Tap = f1 (ActPosTop, ActPosBtm), which improves the repeatability of the taper;

[0045] 3) During the initial calibration, the mold may be in any position in the joint gap. The accuracy error caused by this was resolved through secondary calibration.

[0046] 4) Since the joint clearance value changes slowly, it will not cause control system oscillation; the change in the joint clearance value is different from the compensation value. The compensation value mostly modifies the set value. If it is not processed in the protection program, it is easy to trigger the protection action; the change in the joint clearance value is actually a change in the actual value, and the protection program does not need to do any processing.

[0047] 5) The joint clearance value only works in dynamic conditions, affecting the dynamic accuracy of the equipment but not the static accuracy. The working index of the dynamic accuracy of the equipment is inherently larger than the static accuracy index value, so the change in the actual position value fully meets the use requirements of the equipment accuracy.

[0048] In order to achieve the above and related purposes, one or more aspects of the present invention include the features that will be described in detail later. The following description and the accompanying drawings describe some exemplary aspects of the present invention in detail. However, these aspects indicate only some of the various ways in which the principles of the present invention can be used. In addition, the present invention is intended to include all of these aspects and their equivalents. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] By referring to the following description in conjunction with the accompanying drawings, and with a more complete understanding of the present invention, other objects and results of the present invention will become more clear and easy to understand. In the accompanying drawings:

[0050] Figure 1 Schematic diagram of the structure of an online thermal width adjustment device for a crystallizer according to an embodiment of the present invention;

[0051] Figure 2 Schematic diagram of the process of the on-line thermal width adjustment method of the crystallizer according to an embodiment of the present invention;

[0052] Figure 3 Schematic diagram of the spatial posture of the crystallizer according to an embodiment of the present invention.

[0053] The accompanying drawings include: 1. upper joint, 2. lower joint, 3. crystallizer, 4. actuator, 5. PLC automatic control system, 6. upper joint gap.

[0054] The same reference numerals throughout the drawings indicate similar or corresponding features or functions. DETAILED DESCRIPTION

[0055] In the following description, for illustrative purposes, numerous specific details are set forth to provide a comprehensive understanding of one or more embodiments. However, it will be apparent that the embodiments may be practiced without these specific details. In other instances, well-known structures and devices are shown in block diagram form to facilitate description of one or more embodiments.

[0056] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0057] In response to the aforementioned problem that during online thermal width adjustment of the existing crystallizer, the taper becomes smaller due to mechanical clearance, resulting in steel leakage accidents, the present invention provides an online thermal width adjustment device and method for the crystallizer.

[0058] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0059] In order to illustrate the structure of the crystallizer online thermal width adjustment device provided by the present invention, Figure 1An on-line thermal width adjustment device for a crystallizer according to an embodiment of the present invention is shown.

[0060] like Figure 1 As shown, the crystallizer online thermal width adjustment device provided by the present invention includes a joint mechanism connected to the crystallizer 3, an actuator connected to the joint mechanism, and a PLC automatic control system 5 connected to the actuator, wherein a displacement sensor component is provided in the actuator, and the displacement sensor component is used to detect the position of the joint mechanism and output it to the PLC automatic control system; the PLC automatic control system 5 is used to issue instructions to the actuator according to the data detected by the received displacement sensor component; the actuator 4 is used to act on the joint mechanism according to the instructions received from the PLC automatic control system 5, and drive the crystallizer 3 to move, so as to realize the position adjustment of the crystallizer 3.

[0061] The joint mechanism includes an upper joint 1 provided at the upper end of the crystallizer 3 and a lower joint 2 provided at the lower end of the crystallizer 3 .

[0062] The actuator 4 includes an upper actuator connected to the upper joint 1 and a lower actuator connected to the lower joint 2. The displacement sensor assembly includes an upper displacement sensor and a lower displacement sensor. The upper displacement sensor is disposed in the upper actuator and is used to detect the position of the upper joint and transmit the detected position information to the PLC automatic control system. The lower displacement sensor is disposed in the lower actuator and is used to detect the position of the lower joint and transmit the detected position information to the PLC automatic control system.

[0063] Corresponding to the above device, the present invention also provides a method for online thermal width adjustment of a crystallizer. Figure 2 The flow chart of the on-line thermal width adjustment method of the crystallizer according to an embodiment of the present invention is shown.

[0064] like Figure 2 As shown, the crystallizer online thermal width adjustment method provided by the present invention uses the above-mentioned crystallizer online thermal width adjustment device to adjust the crystallizer, and the method is specifically as follows:

[0065] S210: When the crystallizer is in an initial state, performing an initial calibration on the crystallizer to obtain an initial upper joint position actual value of an upper joint corresponding to an upper end of the crystallizer, and an initial lower joint position actual value of a lower joint corresponding to a lower end of the crystallizer;

[0066] S220: Comparing the initial upper joint position actual value and the initial lower joint position actual value with the upper joint preset position value and the lower joint preset position value respectively;

[0067] S230: According to the comparison result, the upper joint and the lower joint are moved to a preset upper joint position and a preset lower joint position respectively;

[0068] S240: After the upper joint and the lower joint move to the upper joint preset position and the lower joint position respectively, the upper joint and the lower joint continue to move respectively by the distance of the upper joint gap value and the distance of the lower joint gap value;

[0069] S250: After the upper joint moves the distance of the upper joint gap value and the lower joint moves the distance of the lower joint gap value, the crystallizer is calibrated for the second time to obtain the current upper joint position actual value of the upper joint corresponding to the upper end of the crystallizer and the current lower joint position actual value of the lower joint corresponding to the lower end of the crystallizer;

[0070] S260: According to the current upper joint position value and the current joint position value, the upper joint and the lower joint are moved to the target position to achieve online thermal regulation of the crystallizer.

[0071] In an embodiment of the present invention,

[0072] In step S210, the formula for the actual value of the initial upper joint position is:

[0073] ActPosTop1=PosTop1

[0074] Among them, ActPosTop1 represents the initial upper joint position value, and PosTop1 represents the initial reading joint position value of the upper joint;

[0075] The formula for the actual value of the initial lower joint position is:

[0076] ActPosBtm1=PosBtm1

[0077] Among them, ActPosBtm1 represents the actual value of the initial lower joint position, and PosBtm1 represents the initial reading joint position value of the lower joint.

[0078] The formula for initial calibration of taper value is:

[0079] Tap1=f1(ActPosTop1, ActPosBtm1)

[0080] Among them, Tap1 represents the initial calibration taper value; f1 represents the functional relationship between ActPosTop1 and ActPosBtm1.

[0081] In steps S220 to S240, after the initial calibration, the process of eliminating joint clearance is carried out. The initial actual value of the upper joint position and the initial actual value of the lower joint position are obtained through the initial calibration, and are compared with the preset upper joint position value and the preset lower joint position value. The preset upper and lower joint position values ​​are set based on the mold without steel leakage and the minimum taper.

[0082] According to the comparison results, the upper joint and the lower joint are moved to the upper joint preset position and the lower joint preset position respectively; due to the existence of the joint gap, there is a possibility of steel leakage when the upper and lower joints are moved to the preset positions. In order to solve the possibility of steel leakage, the present invention continues to move the distance of the upper joint gap and the distance of the lower joint gap respectively after the upper joint and the lower joint are moved to the upper joint preset position and the lower joint position respectively, and the existence of the gap is eliminated at this time.

[0083] In step S250, the formula for the actual value of the current upper joint position is:

[0084] ActPosTop2=PosTop2+GapTop

[0085] Among them, ActPosTop2 represents the actual value of the current upper joint position, PosTop2 represents the current reading joint position value of the upper joint, and GapTop represents the upper joint gap;

[0086] The formula for the actual value of the current lower joint position is:

[0087] ActPosBtm2=PosBtm2-GapBtm

[0088] Among them, ActPosBtm2 represents the actual value of the current lower joint position, PosBtm2 represents the current reading joint position value of the lower joint, and GapBtm represents the lower joint gap.

[0089] The formula for the secondary calibration taper value is:

[0090] Tap2=f1(ActPosTop2, ActPosBtm2)

[0091] Among them, Tap2 represents the secondary calibration taper value; f1 represents the functional relationship between ActPosTop2 and ActPosBtm2.

[0092] exist Figure 3The illustrated embodiment is a simplified schematic diagram of the mold's spatial posture. Moving the mold closer to the centerline of the casting machine narrows it; moving it farther away widens it. The lines connecting the upper and lower parts represent the mold's spatial posture. "Upper inner" and "upper outer" represent the mold's position within the upper and lower joint gaps, respectively. For the upper joint gap 6, the side of the mold's upper end closer to the centerline of the casting machine is "upper inner," and farther away is "upper outer."

[0093] Due to mechanical clearance in the joints, if no special control is performed, the mold will stop at any position within the upper and lower clearances after the mold taper is adjusted. Before pouring, the line connecting the upper and lower outer portions represents a spatial state of the mold, meaning that the mold taper meets production process requirements. After pouring, the mold fills with molten steel, creating various stresses. If the line connects the upper inner portion and the lower outer portion, the mold taper will be smaller than the initial upper and lower outer portions. As the mold ages, the mechanical clearance gradually increases, the mold taper shrinks more, and the rate of breakout increases.

[0094] from Figure 3 It can be concluded that if the spatial posture of the upper inner and lower outer lines is adopted after each crystallizer adjustment, then no matter how the structural stress of the crystallizer changes, the mechanical clearance will only cause the taper to become larger, and will not cause the taper to become smaller. At the same time, it is also irrelevant to the service life of the crystallizer equipment, thus overcoming the steel leakage accident caused by the reduction of the crystallizer taper.

[0095] Joint gap value (gap), upper and lower joint gaps are represented by GapTop and GapBtm respectively. The control of joint gap value is one of the patents of this invention. When the joint moves from static to moving, its value slowly transitions from zero to gap; when the joint moves from moving to static, its value slowly transitions from gap to zero;

[0096] The actual value of the upper joint position (ActPosTop) is measured by the displacement sensor in the oil cylinder connected to it (PosTop). After the joint gap value is introduced in the present invention, its expression is: ActPosTop=PosTop+GapTop;

[0097] The lower joint position value (ActPosBtm) is measured by the displacement sensor connected to the actuator (PosBtm). After the joint clearance value is introduced in the present invention, its expression is:

[0098] ActPosBtm=PosBtm-GapBtm; the taper value (Tap) is a function of ActPosTop and ActPosBtm, that is, Tap=f1(ActPosTop, ActPosBtm).

[0099] During the initial calibration, the actual joint values ​​obtained cannot overcome the effect of mechanical clearance, as the mold may stop at any position within the mechanical clearance. By changing the set values ​​of the upper and lower joints and beginning to move the joints according to the joint clearance control method of the present invention, the mold will be in the upper-inside and lower-outside spatial postures after it stops again. A second calibration can be performed, and the actual joint position values ​​will be the actual values ​​after the mechanical clearance is eliminated.

[0100] In an embodiment of the present invention, an initial calibration is performed first. After the initial calibration, the set value of the joint is modified. For example, if the set value becomes larger, the joint begins to move in the width adjustment direction. At the same time, GapTop and GapBtm slowly transition from zero to gap. When the actual value moves to the set value, GapTop and GapBtm slowly transition from gap to zero. During the transition process, the ActPosTop value gradually decreases, while the set value remains unchanged. The PLC control system drives the upper joint to move slowly in the width adjustment direction until GapTop becomes zero, that is, the upper joint will slowly move the length of GapTop away from the center axis of the casting machine. At this time, it can be seen that the upper end of the crystallizer is in the upper inner position; similarly, during the transition process, the ActPosBtm value gradually increases, while the set value remains unchanged. The PLC control system drives the lower joint to move slowly in the narrowing direction until GapBtm becomes zero, that is, the lower joint will slowly move the length of GapBtm toward the center axis of the casting machine. At this time, it can be seen that the lower end of the crystallizer is in the lower outer position; after the crystallizer stops, the secondary calibration value is obtained, and the secondary calibration is completed. The purpose of the secondary calibration is to ensure that the mold is in an up-inside-down-outside spatial posture during calibration.

[0101] That is: in the embodiment of the present invention, on the basis of secondary calibration, in conjunction with the joint clearance control, it can be ensured that no matter how the joint moves, the crystallizer can be kept in the spatial posture of top inside and bottom outside after it stops, thereby solving the problem of the crystallizer's online thermal width taper becoming smaller.

[0102] It can be seen from the above embodiments that the crystallizer online thermal width adjustment device and method provided by the present invention can eliminate the manually measured mechanical gap obtained during the initial calibration through one movement, and the second calibration is to ensure the accuracy of the target position after eliminating the gap; the present invention solves the problem of steel leakage accidents caused by the mechanical gap causing the taper to become smaller during the existing crystallizer online thermal width adjustment through two calibrations.

[0103] The above description of the device and method for online thermal width adjustment of a crystallizer according to the present invention is described by way of example with reference to the accompanying drawings. However, those skilled in the art will appreciate that various modifications may be made to the device and method for online thermal width adjustment of a crystallizer without departing from the scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A crystallizer online thermal width adjustment method, using a crystallizer online thermal width adjustment device to adjust the crystallizer, wherein: The crystallizer online thermal width adjustment device includes a joint mechanism connected to the crystallizer, the joint mechanism includes an upper joint arranged at the upper end of the crystallizer and a lower joint arranged at the lower end of the crystallizer, and the method is specifically as follows: When the crystallizer is in an initial state, performing an initial calibration on the crystallizer to obtain an initial upper joint position actual value of an upper joint corresponding to an upper end of the crystallizer, and an initial lower joint position actual value of a lower joint corresponding to a lower end of the crystallizer; Comparing the initial upper joint position actual value and the initial lower joint position actual value with the upper joint preset position value and the lower joint preset position value respectively; According to the comparison result, the upper joint and the lower joint are moved to the upper joint preset position and the lower joint preset position respectively; When the upper joint and the lower joint are moved to the upper joint preset position and the lower joint position respectively, the upper joint and the lower joint continue to move respectively by the distance of the upper joint gap value and the distance of the lower joint gap value; After the upper joint moves the distance of the upper joint gap value and the lower joint moves the distance of the lower joint gap value, the crystallizer is calibrated for the second time to obtain the current upper joint position actual value of the upper joint corresponding to the upper end of the crystallizer and the current lower joint position actual value of the lower joint corresponding to the lower end of the crystallizer; According to the current upper joint position value and the current lower joint position value, the upper joint and the lower joint are moved to the target position to realize the online thermal regulation of the crystallizer.

2. The method for online thermal width adjustment of a crystallizer according to claim 1, wherein: The formula for the actual value of the initial upper joint position is: ActPosTop1=PosTop1 Among them, ActPosTop1 represents the actual value of the initial upper joint position, and PosTop1 represents the initial reading joint position value of the upper joint; The formula for the actual value of the initial lower joint position is: ActPosBtm1=PosBtm1 Among them, ActPosBtm1 represents the actual value of the initial lower joint position, and PosBtm1 represents the initial reading joint position value of the lower joint.

3. The method for online thermal width adjustment of a crystallizer according to claim 2, wherein: The formula for initial calibration of taper value is: Tap1 =f1(ActPosTop1, ActPosBtm1) Among them, Tap1 represents the initial calibration taper value; f1 represents the functional relationship between ActPosTop1 and ActPosBtm1.

4. The method for online thermal width adjustment of a crystallizer according to claim 3, wherein: The joint gap value includes the upper joint gap value and the lower joint gap value. When the joint moves from static to moving, the joint gap value slowly transitions from zero to a maximum value. When the joint moves from moving to static, the joint gap value slowly transitions from the maximum value to zero.

5. The method for online thermal width adjustment of a crystallizer according to claim 4, wherein: Obtaining the upper joint gap value and the lower joint gap value through initial calibration; The formula for the actual value of the current upper joint position is: ActPosTop2=PosTop2+GapTop Among them, ActPosTop2 represents the actual value of the current upper joint position, PosTop2 represents the current reading joint position value of the upper joint, and GapTop represents the upper joint gap; The formula for the actual value of the current lower joint position is: ActPosBtm2=PosBtm2-GapBtm Among them, ActPosBtm2 represents the actual value of the current lower joint position, PosBtm2 represents the current reading joint position value of the lower joint, and GapBtm represents the lower joint gap.

6. The method for online thermal width adjustment of a crystallizer according to claim 5, wherein: The formula for the secondary calibration taper value is: Tap2 =f1(ActPosTop2, ActPosBtm2) Among them, Tap2 represents the secondary calibration taper value; f1 represents the functional relationship between ActPosTop2 and ActPosBtm2.

7. The method for online thermal width adjustment of a crystallizer according to claim 6, wherein: The crystallizer online thermal width adjustment device further includes an actuator connected to the joint mechanism, and a PLC automatic control system connected to the actuator, wherein: A displacement sensor assembly is provided in the actuator, and the displacement sensor assembly is used to detect the position of the joint mechanism and output it to the PLC automatic control system; The PLC automatic control system is used to issue instructions to the actuator according to the data detected by the displacement sensor component; The actuator is used to act on the joint mechanism according to the instructions received from the PLC automatic control system, and drive the crystallizer to move, thereby achieving position adjustment of the crystallizer.

8. The method for online thermal width adjustment of a crystallizer according to claim 7, wherein: The actuator comprises an upper actuator connected to the upper joint and a lower actuator connected to the lower joint; The displacement sensor assembly includes an upper displacement sensor and a lower displacement sensor.

9. The method for online thermal width adjustment of a crystallizer according to claim 8, wherein: The upper displacement sensor is arranged in the upper actuator, and is used to detect the position of the upper joint and send the detected position information to the PLC automatic control system; The lower displacement sensor is arranged in the lower actuator, and is used to detect the position of the lower joint and send the detected position information to the PLC automatic control system.

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