Automatic calibration method for coiling block of hot rolling coiling machine

Abstract

The invention relates to the technical field of hot-rolling coiling machine coiling block calibration, and discloses a hot-rolling coiling machine coiling block automatic calibration method which comprises the following steps: preparing a system; contracting the reel to the minimum diameter and keeping the diameter; the stroke value of the expansion and shrinkage oil cylinder at the moment is calibrated as 0 mm, and the diameter of the winding drum at the moment is calibrated as the standard minimum diameter; expanding the winding drum to the maximum diameter and keeping the diameter; rotating the winding drum for one circle at a low speed, recording the stroke of the expansion oil cylinder at the stage, and obtaining the maximum stroke value and the minimum stroke value; determining the precision of the measuring disc; and the stroke precision of the expansion oil cylinder is judged. According to the automatic calibration method for the hot-rolling coiling machine coiling block, the zero position of the coiling block can be calibrated in a full-automatic mode, and meanwhile the stroke precision of a coiling block expansion oil cylinder and the precision of a measuring disc are checked.

Description

Technical Field

[0001] This invention relates to the field of hot rolling coiler calibration technology, and specifically to an automatic calibration method for hot rolling coiler drums. Background Technology

[0002] The hot-rolled underground coiler is installed behind the output roller table of the hot continuous rolling mill. Usually, 2 to 3 units are installed in sequence. The coiler drum is mounted on the coiler fixed seat through two bearings on the drive side and is used to coil the hot-rolled strip steel into coils.

[0003] The drum is composed of a hollow spindle, a wedge-shaped tie rod, a sector plate, an expansion cylinder, a connecting rod, and a plunger. The hollow spindle has a through axial inner hole and a radial hole. The wedge-shaped tie rod is installed in its axial hole, enabling axial movement. The plunger is installed in its radial hole, enabling radial displacement. The right end of the hollow spindle is connected to the expansion cylinder via a connector. The left section of the wedge-shaped tie rod has multiple pyramidal surfaces, which contact the inclined surface of the plunger. The right end of the wedge-shaped tie rod is connected to the piston rod of the expansion cylinder via a coupling. The sector plate is connected to the wedge-shaped tie rod via a connecting rod. The lower surface of the sector plate contacts the plunger. The end shaft is connected to the hollow spindle via bolts.

[0004] Its working principle is as follows: During operation, the drum begins to rotate under the drive of the transmission mechanism. Under the action of the expansion and contraction cylinder, the wedge-shaped tie rod moves to the right within the hollow shaft. The wedge-shaped surface of the left section of the wedge shaft pushes the plunger installed in the radial hole of the hollow main shaft to move outward. The outer end face of the plunger pushes the fan-shaped plate to expand outward (that is, the expansion of the drum). When the diameter of the drum expands to the set value (pre-winding state), the strip steel begins to be wound with the assistance of the coiling roller. After winding several coils of strip, the wedge-shaped tie rod continues to move to the right under the action of the expansion and contraction cylinder, and the drum expands further (completing the secondary expansion to ensure the strip steel is tightly wound). Almost simultaneously or slightly later, the coiling roller opens, and the drum quickly winds up the strip steel and establishes winding tension between itself and the last stand finishing mill. After a roll of tape is wound, the transmission system brakes, the drum stops rotating, the wedge-shaped tie rod moves to the left under the action of the expansion and contraction cylinder, the plunger moves inward, and the wedge shaft pulls the sector plate inward through the tie rod to retract, the drum diameter shrinks to the unwinding state, and unwinding begins.

[0005] The expansion and contraction signals of hot-rolled coils are typically acquired using non-contact laser rangefinders. After acquisition, the signals are fed back to a PLC system, which, via a servo system, controls the position of the piston rod of the expansion and contraction cylinder, thereby controlling the outer diameter of the coil. The coiler is equipped with a measuring disc that moves synchronously with the expansion and contraction cylinder, and a laser rangefinder sensor located on the coiler to measure the travel of the measuring disc. When the expansion and contraction cylinder moves, the measuring disc moves back and forth accordingly. The laser rangefinder sensor detects the change in the relative distance between the measuring disc and the laser rangefinder sensor to determine the travel of the expansion and contraction cylinder. For standard coils, the travel of the expansion and contraction cylinder corresponds to the coil diameter; that is, a certain travel corresponds to a certain diameter. This data can be provided by the manufacturer or measured by the hot rolling mill itself, and typically consists of about 20 sets of data.

[0006] However, during the production of hot-rolled strip steel, the mechanical structure of the coil will be subjected to mechanical wear due to the impact and friction of high temperature and high strength steel plate. In order to ensure that the equipment control function of the coiler always maintains high precision, the expansion value of the coil needs to be recalibrated regularly. Similarly, after replacing the coil, the corresponding calibration operation must also be performed.

[0007] Currently, most domestic manufacturers use manual calibration of the drum diameter. This involves personnel entering the winding machine to measure the drum diameter using an outside micrometer, or measuring the circumference with a tape measure and converting it to diameter, then manually writing the data into the PLC system. However, manual measurement has several drawbacks: first, it requires manual entry into the winding machine, posing a safety risk, and the measurement data may not be accurate; second, it is tedious and time-consuming, impacting production; and third, wear or deformation of the drum's mechanical structure, especially deformation of the measuring disc, is difficult to detect manually, requiring the use of a dial indicator for disc inspection. Summary of the Invention

[0008] The purpose of this invention is to address the shortcomings of the above-mentioned technologies by providing an automatic calibration method for hot rolling coiler drums, which can automatically calibrate the drum zero position and simultaneously check the stroke accuracy of the drum expansion and contraction cylinder and the accuracy of the measuring disc.

[0009] To achieve the above objectives, the automatic calibration method for hot-rolled coiler drums designed in this invention includes a measuring disk mounted on the coiler that moves synchronously with the expansion and contraction cylinder, and a laser rangefinder sensor mounted on the coiler to measure the stroke of the measuring disk. The automatic calibration method includes the following steps: A) System preparation; B) Shrink the reel to its minimum diameter and hold; C) The PLC system calibrates the stroke value of the expansion cylinder to 0mm at this time, and calibrates the drum diameter to the standard minimum diameter at this time; D) Expand the drum to its maximum diameter and maintain it at the maximum expansion level; E) The drum rotates at low speed for one revolution. During this process, the PLC system records the stroke of the expansion and contraction cylinder during this stage and obtains the maximum stroke L of the expansion and contraction cylinder under the condition of maximum expansion. max and minimum travel value L min ; F) Determine the accuracy of the measuring disc: The accuracy threshold of the measuring disc is a, when L... max -L min When L ≤ a, the accuracy of the measuring disc is deemed to meet the standard; when L max -L min When the value is greater than a, the accuracy of the measuring disc is determined to be substandard, and an alarm for substandard measuring disc accuracy is output to remind maintenance personnel; G) Determine the stroke accuracy of the expansion cylinder: Assume the stroke of a standard drum expansion cylinder is L. S The stroke accuracy threshold of the expansion and contraction cylinder is b. When |L max -L S |≤b, and |L min -L S When | ≤ b, the stroke accuracy of the expansion and contraction cylinder meets the standard; when | L max -L S |>b, or |L min -L S When | > b, the stroke accuracy of the expansion cylinder is not up to standard, and an alarm for insufficient stroke accuracy of the expansion cylinder is triggered to remind maintenance personnel.

[0010] Preferably, after automatic calibration is completed, the PLC system cancels the output signal to the hydraulic servo system of the drum.

[0011] Preferably, in step A), the system preparation includes the following: the corresponding data of the expansion and contraction cylinder stroke and the drum diameter have been written into the PLC system; the transmission system and hydraulic system of the drum have been prepared; and the hydraulic system of the auxiliary winding roller has been prepared.

[0012] Preferably, in step A), the gap of the winding aid roller is opened to ensure that the winding drum does not touch the winding aid roller after it has fully expanded.

[0013] Preferably, in step B), the PLC system outputs a fixed value to the servo system, commanding the expansion cylinder to extend and the drum to retract. When the stroke of the expansion cylinder measured by the laser rangefinder no longer changes, it is determined that the drum has retracted to its minimum diameter. The PLC system maintains its output to the servo system to ensure that the expansion cylinder does not move.

[0014] Preferably, in step D), the PLC system outputs a reverse fixed value to the servo system, commanding the expansion cylinder to retract and the drum to expand. When the stroke of the expansion cylinder measured by the laser rangefinder no longer changes, it is determined that the drum has expanded to its maximum diameter. The PLC system maintains its output to the servo system to ensure that the expansion cylinder does not move.

[0015] Preferably, the opening is a fixed value of 10% to 20%.

[0016] Preferably, the feature is that: when the current value of the expansion cylinder stroke measured by the laser rangefinder is... n The difference between the readings two seconds ago is less than c The laser rangefinder sensor determined that the stroke of the hydraulic cylinder no longer changed. n The time threshold for determining the trip duration. c This is the travel accuracy threshold, the value of which depends on the detection accuracy of the laser rangefinder sensor.

[0017] Preferably, in step E), the maximum stroke L of the expansion cylinder under maximum expansion conditions is obtained. max and minimum travel value L min The method is as follows: After the drum starts rotating at low speed, the maximum stroke L of the expansion and contraction cylinder is given. max and minimum value L min Assignment, L max =-m,L min =m, where m is greater than the standard stroke of the expansion and contraction cylinder; If the current stroke L of the expansion cylinder is greater than the maximum stroke of the expansion cylinder at the previous moment, i.e., L>L max Then L max =L; If the current stroke L of the expansion and contraction cylinder is less than the minimum stroke of the expansion and contraction cylinder at the previous moment, i.e., L <L min Then L min =L; After the drum completes one revolution, the current L max and L min The assigned value is the maximum stroke L of the expansion cylinder under the condition of maximum expansion. max and minimum travel value L min .

[0018] Compared with the prior art, the present invention has the following advantages: 1. It can quickly and automatically calibrate the drum zero position with one click; 2. It can simultaneously check the stroke accuracy of the expansion and contraction cylinder and the accuracy of the measuring disc; 3. It reduced labor intensity and improved efficiency. Attached Figure Description

[0019] Figure 1 This is a flowchart of the automatic calibration method for hot rolling coiler drum of the present invention. Detailed Implementation

[0020] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0023] Example 1 An automatic calibration method for a hot-rolled coiler includes a measuring disk mounted on the coiler that moves synchronously with the expansion and contraction cylinder, and a laser rangefinder sensor mounted on the coiler to measure the stroke of the measuring disk. The automatic calibration method includes the following steps: A) System preparation; B) Shrink the reel to its minimum diameter and hold; C) The PLC system calibrates the stroke value of the expansion cylinder to 0mm at this time, and calibrates the drum diameter to the standard minimum diameter at this time; D) Expand the drum to its maximum diameter and maintain it at the maximum expansion level; E) The drum rotates at low speed for one revolution. During this process, the PLC system records the stroke of the expansion and contraction cylinder during this stage and obtains the maximum stroke L of the expansion and contraction cylinder under the condition of maximum expansion. max and minimum travel value L min ; F) Determine the accuracy of the measuring disc: The accuracy threshold of the measuring disc is a, when L... max -L min When L ≤ a, the accuracy of the measuring disc is deemed to meet the standard; when L max -Lmin When the value is greater than a, the accuracy of the measuring disc is determined to be substandard, and an alarm for substandard measuring disc accuracy is output to remind maintenance personnel; G) Determine the stroke accuracy of the expansion cylinder: Assume the stroke of a standard drum expansion cylinder is L. S The stroke accuracy threshold of the expansion and contraction cylinder is b. When |L max -L S |≤b, and |L min -L S When | ≤ b, the stroke accuracy of the expansion and contraction cylinder meets the standard; when | L max -L S |>b, or |L min -L S When | > b, the stroke accuracy of the expansion cylinder is not up to standard, and an alarm for insufficient stroke accuracy of the expansion cylinder is triggered to remind maintenance personnel.

[0024] Example 2 like Figure 1 As shown, an automatic calibration method for a hot-rolled coiler includes a measuring disk mounted on the coiler that moves synchronously with the expansion and contraction cylinder, and a laser rangefinder sensor mounted on the coiler to measure the stroke of the measuring disk. The automatic calibration method includes the following steps: A) System preparation, which includes the following: the corresponding data of the expansion cylinder stroke and the drum diameter has been written into the PLC system; the transmission system and hydraulic system of the drum have been prepared; the hydraulic system of the auxiliary winding roller has been prepared; the roller gap of the auxiliary winding roller has been opened to ensure that the drum does not touch the auxiliary winding roller after it is fully expanded. B) The drum is retracted to its minimum diameter and held. Specifically, the PLC system outputs a fixed value to the servo system, which is 10% to 20% of the opening, commanding the expansion cylinder to extend and the drum to retract. When the stroke of the expansion cylinder measured by the laser rangefinder no longer changes, it is determined that the drum has retracted to its minimum diameter, that is, when the current value of the expansion cylinder stroke measured by the laser rangefinder is equal to... n The difference between the readings two seconds ago is less than c The laser rangefinder sensor determined that the stroke of the hydraulic cylinder no longer changed. n The time threshold for determining the trip duration. c The stroke determination accuracy threshold is determined by the detection accuracy of the laser rangefinder. The PLC system maintains its output to the servo system to ensure that the expansion and contraction cylinder does not move. C) The PLC system calibrates the stroke value of the expansion cylinder to 0mm at this time, and calibrates the drum diameter to the standard minimum diameter at this time; D) Expand the drum to its maximum diameter and maintain it at maximum expansion. Specifically, the PLC system outputs a fixed reverse value to the servo system, with the fixed value being 10% to 20% of the opening, commanding the expansion cylinder to retract and the drum to expand. When the stroke of the expansion cylinder measured by the laser rangefinder no longer changes, it is determined that the drum has expanded to its maximum diameter, that is, when the current value of the expansion cylinder stroke measured by the laser rangefinder is equal to... n The difference between the readings two seconds ago is less than c The laser rangefinder sensor determined that the stroke of the hydraulic cylinder no longer changed. n The time threshold for determining the trip duration. c The stroke determination accuracy threshold is determined by the detection accuracy of the laser rangefinder. The PLC system maintains its output to the servo system to ensure that the expansion and contraction cylinder does not move. E) The drum rotates at low speed for one revolution. During this process, the PLC system records the stroke of the expansion and contraction cylinder during this stage and obtains the maximum stroke L of the expansion and contraction cylinder under the condition of maximum expansion. max and minimum travel value L min To obtain the maximum stroke L of the expansion cylinder under the condition of maximum expansion. max and minimum travel value L min The method is as follows: After the drum starts rotating at low speed, the maximum stroke L of the expansion and contraction cylinder is given. max and minimum value L min Assignment, L max =-m,L min =m, where m is greater than the standard stroke of the expansion and contraction cylinder; If the current stroke L of the expansion cylinder is greater than the maximum stroke of the expansion cylinder at the previous moment, i.e., L>L max Then L max =L; If the current stroke L of the expansion and contraction cylinder is less than the minimum stroke of the expansion and contraction cylinder at the previous moment, i.e., L <L min Then L min =L; After the drum completes one revolution, the current L max and L min The assigned value is the maximum stroke L of the expansion cylinder under the condition of maximum expansion. max and minimum travel value L min ; F) Determine the accuracy of the measuring disc: The accuracy threshold of the measuring disc is a, when L... max -L min When L ≤ a, the accuracy of the measuring disc is deemed to meet the standard; when L max -L min When the value is greater than a, the accuracy of the measuring disc is determined to be substandard, and an alarm for substandard measuring disc accuracy is output to remind maintenance personnel; G) Determine the stroke accuracy of the expansion cylinder: Assume the stroke of a standard drum expansion cylinder is L. S The stroke accuracy threshold of the expansion and contraction cylinder is b. When |L max -L S |≤b, and |L min -L S When | ≤ b, the stroke accuracy of the expansion and contraction cylinder meets the standard; when | L max -L S |>b, or |L min -L S When | > b, the stroke accuracy of the expansion cylinder is not up to standard, and an alarm for insufficient stroke accuracy of the expansion cylinder is triggered to remind maintenance personnel.

[0025] After automatic calibration is completed, the PLC system cancels the output signal to the hydraulic servo system of the drum.

[0026] Taking the calibration process of a coiler drum in a hot rolling mill as an example, the standard stroke of the drum expansion and contraction cylinder is 53.9mm, the diameter is 727mm in the fully contracted state, 745mm in the pre-expanded state, and 762mm in the fully expanded state. A laser rangefinder sensor is installed at the measuring plate, which can detect the distance from the measuring plate to the laser rangefinder sensor.

[0027] The calibration and inspection process is as follows: A) The operator puts the auxiliary winding roller and drum servo system into operation and sets it to enter calibration mode. After the personnel leave the site, they press the "Automatic Calibration Drum" button to start the calibration process. The PLC system automatically opens the auxiliary winding roller gap to the maximum gap. B) When the drum retracts to its minimum diameter, the PLC system outputs a fixed value (10% opening) to the servo system, commanding the expansion cylinder to extend and the drum to retract. The method to determine that the drum has retracted to its minimum diameter is that the stroke of the expansion cylinder measured by the laser rangefinder no longer changes. Specifically, the difference between the stroke of the expansion cylinder measured by the laser rangefinder and the reading a few seconds ago is less than 0.1mm. After the drum retracts to its minimum diameter, the PLC system maintains its output to the servo system to ensure that the expansion cylinder does not move. C) The PLC system calibrates the stroke value of the expansion and contraction cylinder to 0mm and the drum diameter to the standard minimum diameter of 727mm. D) When the drum expands to its maximum position, the PLC system outputs a reverse fixed value (10% opening) to the servo system, commanding the drum expansion cylinder to retract. The drum expands. The method to determine that the drum has expanded to its maximum diameter is that the stroke of the expansion cylinder measured by the laser rangefinder no longer changes. Specifically, the difference between the stroke of the expansion cylinder measured by the laser rangefinder and the reading a few seconds ago is less than 0.1mm. After the drum expands to its maximum diameter, the PLC system continues to maintain the output to the servo system to ensure that the expansion cylinder does not move. E) Rotate the drum at low speed for one revolution, and during this process, the PLC records the stroke reading L of the calibrated expansion and contraction cylinder, and determines the maximum stroke value L under the condition of maximum expansion. max and minimum value L min Record the maximum stroke L at the fully expanded position of the expansion cylinder. max and minimum value L min The method is as follows: After the drum starts rotating at low speed, the maximum stroke L of the expansion and contraction cylinder is given. max and minimum value L min Assignment, L max =-100, L min =100; If the current stroke L of the expansion cylinder is greater than the maximum stroke of the expansion cylinder at the previous moment, i.e., L>L max Then L max =L; If the current stroke L of the expansion and contraction cylinder is less than the minimum stroke of the expansion and contraction cylinder at the previous moment, i.e., L <L min Then L min =L; After the drum completes one revolution, it stops rotating. The current L... max and L min The assigned value is the maximum stroke L of the expansion cylinder under the condition of maximum expansion. max and minimum travel value L min ; F) Determine the accuracy of the measuring disc: The accuracy threshold of the measuring disc is 0.3mm. When L max -L min When the thickness is ≤0.3mm, the accuracy of the measuring disc is considered to be up to standard; when L... max -L min If the accuracy is greater than 0.3mm, the measuring disc is deemed to be substandard, and an alarm for substandard measuring disc accuracy is output to remind maintenance personnel. G) Determine the stroke accuracy of the expansion and contraction cylinder: Assume the stroke accuracy threshold of the expansion and contraction cylinder is 0.5mm, when |L max -53.9mm︱≤0.5mm, and |L min When -53.9mm︱≤0.5mm, the stroke accuracy of the expansion and contraction cylinder meets the standard; when |L max -53.9mm | > 0.5mm, or |L min When -53.9mm︱>0.5mm, the stroke accuracy of the expansion cylinder is not up to standard, and an alarm for insufficient stroke accuracy of the expansion cylinder is triggered to remind maintenance personnel.

[0028] After automatic calibration is completed, the PLC system cancels the output signal to the hydraulic servo system of the drum. The drum calibration and accuracy check are completed. The PLC system sets the drum movement to a diameter of 745mm, ready for production use.

[0029] The present invention provides an automatic calibration method for hot rolling coiler drums, which can quickly and automatically calibrate the drum zero position with one click; it can simultaneously check the stroke accuracy of the expansion and contraction cylinder and the accuracy of the measuring disc; it reduces labor intensity and improves efficiency.

[0030] It should be noted that the above description of the technical solutions is exemplary, and this specification may be embodied in different forms and should not be construed as limiting it to the technical solutions set forth herein. Rather, providing these descriptions will ensure that the disclosure of this invention is thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. Furthermore, the technical solutions of this invention are defined only by the scope of the claims.

[0031] The aspects disclosed in this specification and claims are merely examples, and therefore, this specification and claims are not limited to the details shown. In the foregoing description, detailed descriptions of relevant known functions or configurations have been omitted where it would unnecessarily obscure the focus of this specification and claims.

[0032] When using the terms “comprising,” “having,” and “including” as described in this specification, there may be another part or other part unless used, and the terms used are generally singular but may also be plural.

[0033] Finally, it should be noted that the above description is a further detailed explanation of the invention in conjunction with specific embodiments. It should not be considered that the specific implementation of the invention is limited to these descriptions. For those skilled in the art, any simple substitutions made without departing from the concept of the invention should be considered within the scope of protection of this invention. The above embodiments are merely representative examples of the invention. Obviously, the invention is not limited to the above embodiments and many variations are possible. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the invention should be considered within the scope of protection of this invention.

[0034] It should be noted that the above description of the technical solutions is exemplary, and this specification may be embodied in different forms and should not be construed as limiting it to the technical solutions set forth herein. Rather, providing these descriptions will ensure that the disclosure of this invention is thorough and complete, and will fully convey the scope of this specification to those skilled in the art. Furthermore, the technical solutions of this invention are defined only by the scope of the claims. Features of various embodiments of this invention may be combined or spliced ​​together in part or in whole, and may be implemented in various different configurations as will be fully understood by those skilled in the art. Embodiments of this invention may be implemented independently of each other or may be implemented together in an interdependent relationship.

[0035] For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of the present invention, and the above structures should all be considered to fall within the protection scope of the present invention.

Claims

1. An automatic calibration method for hot-rolled coiler drums, characterized in that: The automatic calibration method includes a measuring disk mounted on the winding machine that moves synchronously with the expansion and contraction cylinder, and a laser rangefinder mounted on the winding machine to measure the stroke of the measuring disk. The method comprises the following steps: A) System preparation; B) Shrink the reel to its minimum diameter and hold; C) The PLC system calibrates the stroke value of the expansion cylinder to 0mm at this time, and calibrates the drum diameter to the standard minimum diameter at this time; D) Expand the drum to its maximum diameter and maintain it at the maximum expansion level; E) The drum rotates at low speed for one revolution. During this process, the PLC system records the stroke of the expansion and contraction cylinder during this stage and obtains the maximum stroke L of the expansion and contraction cylinder under the condition of maximum expansion. max and minimum travel value L min ; F) Determine the accuracy of the measuring disc: The accuracy threshold of the measuring disc is a, when L... max -L min When L ≤ a, the accuracy of the measuring disc is deemed to meet the standard; when L max -L min When the value is greater than a, the accuracy of the measuring disc is determined to be substandard, and an alarm for substandard measuring disc accuracy is output to remind maintenance personnel; G) Determine the stroke accuracy of the expansion cylinder: Assume the stroke of a standard drum expansion cylinder is L. S The stroke accuracy threshold of the expansion and contraction cylinder is b. When |L max -L S |≤b, and |L min -L S When | ≤ b, the stroke accuracy of the expansion and contraction cylinder meets the standard; when | L max -L S |>b, or |L min -L S When | > b, the stroke accuracy of the expansion cylinder is not up to standard, and an alarm for insufficient stroke accuracy of the expansion cylinder is triggered to remind maintenance personnel.

2. The automatic calibration method for hot-rolled coiler drums according to claim 1, characterized in that: After automatic calibration is completed, the PLC system cancels the output signal to the hydraulic servo system of the drum.

3. The automatic calibration method for hot-rolled coiler drums according to claim 1, characterized in that: In step A), the system preparation includes the following: the corresponding data of the expansion and contraction cylinder stroke and the drum diameter have been written into the PLC system; the transmission system and hydraulic system of the drum have been prepared; and the hydraulic system of the auxiliary winding roller has been prepared.

4. The automatic calibration method for hot-rolled coiler drums according to claim 1, characterized in that: In step A), the gap between the rollers of the winding aid roller is opened to ensure that the roller does not touch the winding aid roller after it has fully expanded.

5. The automatic calibration method for hot-rolled coiler drums according to claim 1, characterized in that: In step B), the PLC system outputs a fixed value to the servo system, commanding the expansion cylinder to extend and the drum to retract. When the stroke of the expansion cylinder measured by the laser rangefinder no longer changes, it is determined that the drum has retracted to its minimum diameter. The PLC system continues to output to the servo system to ensure that the expansion cylinder does not move.

6. The automatic calibration method for hot-rolled coiler drums according to claim 1, characterized in that: In step D), the PLC system outputs a reverse fixed value to the servo system, commanding the expansion cylinder to retract and the drum to expand. When the stroke of the expansion cylinder measured by the laser rangefinder no longer changes, it is determined that the drum has expanded to its maximum diameter. The PLC system maintains its output to the servo system to ensure that the expansion cylinder does not move.

7. The automatic calibration method for hot-rolled coiler drums according to any one of claims 5 or 6, characterized in that: The fixed value is 10% to 20% opening.

8. The automatic calibration method for hot-rolled coiler drums according to any one of claims 5 or 6, characterized in that: When the current value of the expansion and contraction cylinder stroke measured by the laser rangefinder is equal to... n The difference between the readings two seconds ago is less than c The laser rangefinder sensor determined that the stroke of the hydraulic cylinder no longer changed. n The time threshold for determining the trip duration. c This is the travel accuracy threshold, the value of which depends on the detection accuracy of the laser rangefinder sensor.

9. The automatic calibration method for hot-rolled coiler drums according to claim 1, characterized in that: In step E), the maximum stroke L of the expansion cylinder under the condition of maximum expansion is obtained. max and minimum travel value L min The method is as follows: After the drum starts rotating at low speed, the maximum stroke L of the expansion and contraction cylinder is given. max and minimum value L min Assignment, L max =-m,L min =m, where m is greater than the standard stroke of the expansion and contraction cylinder; If the current stroke L of the expansion cylinder is greater than the maximum stroke of the expansion cylinder at the previous moment, i.e., L > L max Then L max =L; If the current stroke L of the expansion and contraction cylinder is less than the minimum stroke of the expansion and contraction cylinder at the previous moment, i.e., L < L min Then L min =L; After the drum completes one revolution, the current L max and L min The assigned value is the maximum stroke L of the expansion cylinder under the condition of maximum expansion. max and minimum travel value L min .

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