TWI657872B - Method and computer program product for regulating pressure from wrap rolls to steel belt - Google Patents

Abstract

A method and computer program product for regulating and controlling the pressure of a steel strip roll, which is suitable for a steel strip reel. The steel strip reel includes a mandrel, several rolls, and a controller, and the controller is electrically coupled to the The mandrel and the roll, the method includes the steps of causing a steel strip to be circulated between the mandrel and the roll by the controller, and predicting that one end of the steel strip passes through the plurality of A passing period of each of the rolls; and a pressure mode for controlling the steel strips by the controller to control the plurality of rolls to cause the roll corresponding to the head end to pass outside the passing period A normal pressure state and a reduced pressure state appear during the passing period. In this way, defects caused by the surface of the steel strip are improved.

Description

Method for regulating steel strip roll pressure and computer program product

The invention relates to a method for regulating and controlling a steel strip roll, in particular to a method for regulating and controlling the pressure of a steel strip roll.

In the conventional process of rolling a steel strip, after the steel strip enters the coiler, it may be caused by the end of the steel strip hitting the roll or the transfer of the wedge-shaped piece on the mandrel. Friction chisel marks lead to important flaw indicators of the steel strip.

According to the results of statistical analysis, most of these defects occurred in the inner circle of the steel strip coil and appeared at a fixed distance. It is speculated that the cause was caused by poor control of the roll.

However, the current sensing method is difficult to determine the position of the steel strip head in the coil. Poor control of the gap will cause the steel strip coil to loosen; it is easy to cause collision defects due to pressure when the steel strip head passes the roll; if it cannot be accurately predicted The position of the head end is easy to hit the head of the steel strip during the jump, especially the time of the head end passing the roll is very short. If the roll does not respond quickly enough, it will not be able to jump instantly, resulting in head end collision or loose coils, such as hot rolling mills. The coiler used is a three-roller type. Because three rolls have a shorter jump overlap time than four rolls, the response time of the rolls will be shortened even more.

In view of this, it is necessary to provide a solution different from the past in order to solve the problems existing in conventional technology.

An object of the present invention is to provide a method for regulating the pressure of a steel strip roll, which can timely adjust the pressure of a roll on a steel strip, so as to reduce the failure rate of steel strip coiling.

Another object of the present invention is to provide a computer program product, which can timely adjust the pressure of the roll on the steel strip, so as to reduce the failure rate of the steel strip coil.

In order to achieve the above-mentioned object, the present invention provides a method for regulating the pressure of a steel strip roll, It can be applied to a steel strip reel, the steel strip reel can include a mandrel, several rolls and a controller, the controller is electrically coupled to the mandrel and the roll, the method can include steps : The controller causes a steel strip to be circulated and coiled between the mandrel and the roll, and it is estimated that one end of the steel strip corresponds to a passage through each of the plurality of rolls. Period; and a pressure mode controlled by the controller for the plurality of rolls on the steel strip, so that the roll corresponding to the head end passes a normal pressure state outside the pass period and a time period during the pass period Buck state.

In an embodiment of the present invention, a pressure value of the roll corresponding to the head end in the depressurized state is a product of a pressure value in the normal pressure state and a decompression coefficient, and the decompression The coefficient can be between 0.7 and 0.9.

In one embodiment of the present invention, the controller is electrically coupled to a steel strip detector in front of a nip roll, and it is estimated that the head end of the steel strip corresponds to each of the plurality of rolls. The passing period may include: the controller causing the head end to pass through the plurality of rolls after passing the nip roll front steel strip detector during a coiling stroke, and periodically increasing during the coiling stroke. A distance counting value, and setting the last roll passed by the head end as an end-pass roll according to a load torque variation of the plurality of rolls; and the controller calculating a predetermined rotation of the end-pass roll A time difference between a first time with a moment greater than a torque threshold and a second time when the head end passes through the steel strip detector in front of the nip roller, and is estimated based on the time difference and the distance measurement value A gap between the end-pass roll and the steel strip detector in front of the nip roll, and the head end of the steel strip corresponding to the passing of each of the plurality of rolls according to the gap is estimated Time period.

In one embodiment of the present invention, the controller may periodically obtain the load torque of the last-pass roll; and the predetermined torque may be the steel strip of the last-pass roll just before passing through the nip roll at the head end. An average value of several load torques in a sampling period after the detector.

In one embodiment of the present invention, the torque threshold may be a product of the predetermined torque and a collision coefficient, and the collision coefficient may be between 1.8 and 1.95.

In one embodiment of the present invention, the controller may set the roll passing first by the head end as a through roll according to the load torque variation of the plurality of rolls. After a waiting time has passed after the first pass of the roll, the time difference between the first time and the second time is calculated.

In one embodiment of the present invention, the waiting time may be 90 to 110 milliseconds.

To achieve the above-mentioned object, the present invention provides a computer program product. After the computer program product is loaded and executed by a computer, the computer can execute the method for regulating the pressure of a steel strip roll as described above.

C11‧‧‧curve

C12‧‧‧ curve

C13‧‧‧curve

C14‧‧‧ curve

C21‧‧‧ curve

C22‧‧‧ curve

C23‧‧‧ curve

C24‧‧‧ curve

C25‧‧‧ curve

D‧‧‧ Detector of front steel belt

M‧‧‧ mandrel

P‧‧‧Pinch roller

T‧‧‧steel belt

W1‧‧‧Roller

W2‧‧‧Roller

W3‧‧‧Roller

S1‧‧‧Measurement steps

S11‧‧‧ Detection steps

S12‧‧‧Estimation steps

S2‧‧‧Pressure control step

r _M ‧‧‧ radius

r _P ‧‧‧ radius

L1‧‧‧Distance

H‧‧‧Pitch

H2‧‧‧distance

α ‧‧‧ angle

δ‧‧‧ angle

γ ‧‧‧ angle

FIG. 1 is a flow block diagram of a method for regulating the pressure of a steel strip roll according to an embodiment of the present invention.

Figures 2a to 21: Schematic diagrams of operation of the steel strip coiling process which are different from the automatic jump control of the present invention.

FIG. 3 is a schematic diagram of a distance calculation method according to an embodiment of the present invention.

Fig. 4: The embodiment of the present invention is applicable to the time curve of the collision time and actual torque between the head end and the roll before and after the coil winding process.

FIG. 5 is a time curve diagram of the roll in the embodiment of the present invention showing a state of pressure relief and recompression (normal pressure).

Figures 6a, 6b, and 6c: Three curves of the steel strip coiler are divided into an experimental group and a control group for online testing, and the time curve diagram of the surge caused by the head-end collision of the steel strip.

In order to make the above and other objects, features, and advantages of the present invention more comprehensible, the following describes the preferred embodiments of the present invention and the accompanying drawings in detail, as follows. Furthermore, the directional terms mentioned in the present invention include, for example, top, bottom, top, bottom, front, back, left, right, inside, outside, side, periphery, center, horizontal, horizontal, vertical, vertical, axial, The radial direction, the uppermost layer, or the lowermost layer, etc., are only directions referring to the attached drawings. Therefore, the directional terms used are for explaining and understanding the present invention, but not for limiting the present invention.

Please refer to FIG. 1, the method for adjusting the pressure of the steel strip roll according to the embodiment of the present invention may include a measurement step S1 and a pressure control step S2. It is first explained that the method embodiment can be applied to a steel strip coiler. The steel strip coiler can include a mandrel, a plurality of wrap rolls, and a controller. The controller may be electrically coupled to the mandrel and the roll, for example, the mandrel and the driving component (such as a motor driver) of the roll may be electrically coupled to the controller, and the controller may obtain related motion parameters (Such as motor torque current, etc.), so that the controller can control the movement pattern of the mandrel and the roll; in addition, the controller can also be electrically coupled to a front steel belt detector (HMD, (Or CMD, such as optical transceiver detector, etc.), the remaining components and operating forms of the steel strip coiler can be understood by those with ordinary knowledge in the technical field to which it belongs, and will not be repeated here.

The operation of the method of the above embodiment of the present invention will be illustrated with reference to Figs. 2a to 2l in the following. As shown in Figs. 2a to 21l, it is a schematic diagram of the operation of the steel strip coiling process different from the automatic jump control of the present invention The schematic diagram of the operation of the automatic jump control is used to assist in explaining the features of the present invention, and is not intended to be a limitation of the present invention. The difference between this automatic jump control and the present invention is at least that in the 2f, 2h, and 2j diagrams, the rolls (such as W1, W2, and W3) of the present invention do not jump off and only release pressure. The present invention can avoid automatic jump The controlled roll cannot jump instantly, causing problems such as head collision or loose coiling. Therefore, in terms of the operation process of the method of the embodiment of the present invention, during a coiling stroke, the rolls (take 3 as an example) W1, W2, W3 will be regulated to press a steel strip T, and the steel The head end of the belt T can also pass through a nip roller front steel belt detector D between the rolls W1, W2, and W3. The head end of the steel belt T will be driven by a nip roller. , PR) P guide passes between the rolls W1, W2, W3 and the mandrel M in a cyclic manner, and the rolls W1, W2, W3 respond to the passing of the head end of the steel strip T. The steel strip T applies different pressures to coil the steel strip T on the mandrel M until the coiling stroke ends, and the rolls W1, W2, and W3 can no longer press the steel strip T, for example, open Roller (as shown in Figure 21) and so on.

It should be understood that, for the sake of clarity, the relative positions of the objects in the drawings are not intended to limit the present invention, and parts of the drawings (such as the distance between the mandrel M and the rolls W1 to W3) will be exaggerated. The method is drawn so as not to make the relative relationship between some components unclear, but the implementation should still be based on the overall content disclosed in the description in conjunction with the drawings.

It can be understood that, in order to avoid the content of the drawings being too cluttered, the steel strip detector D in front of the nip roller is only shown in FIG. 2b, and the remaining drawings in FIGS. 2a to 2l are not shown but still exist; In addition, as shown in FIG. 2b, the nip roller front steel strip detector D is behind the nip roller P in the direction of travel, but not limited to this, the nip roller front steel strip detector may also be provided. It is ahead of the nip roller P in the traveling direction.

Please refer to FIG. 1 again. In the measurement step S1, the controller may cause a steel strip T to be driven to circulate in a circular motion between the mandrel M and the rolls W1 to W3 (as in FIGS. 2a to 2f). (Shown in the figure), and one end of the steel strip T (that is, the two ends of T in Figs. 2a to 2l) is estimated. One end of the unbroken line) corresponds to a passage period of passing each of the plurality of rolls W1 to W3, for example, passing through the time sections of the rolls W1, W2, and W3, respectively.

It should be understood that during the coiling process of the steel strip, the distance between the rolls of the first turn of the steel strip coil will be a funnel-shaped opening (from large to small) to adapt to the degree of bending of the steel strip; however, in the present invention In the embodiment, starting from the first turn of the steel strip coil, the opening of the roll W3 must be the thickness of the steel strip (as shown in Figures 2a to 2e) to ensure the normal operation of the head-end detection function. It is specifically stated that many rolls of the embodiments of the present invention do not jump off when passing through the head end of the steel strip and only release pressure. Therefore, during the coiling process of the steel strips, many of the rolls of the embodiments of the present invention will not be instantaneous. The displacement can be regarded as a relatively constant distance between the roll and the mandrel.

In an embodiment, the step of predicting that the head end of the steel strip T corresponds to the passing period of each of the plurality of rolls W1 to W3 (such as W1 or W2 or W3) may include a Detection step S11 and an estimation step S12.

As shown in Figs. 2b to 21, the detection step S11 may be caused by the controller to cause the head end to pass the nip roll front steel strip detector D in a coiling stroke and then pass the roll rolls W1 to W3. ; The controller can also periodically increase a distance value during the coiling stroke (for example, the value of a counter is incremented in the form of discrete time) as a basis for estimating the distance; the controller can also be based on the number A change in load torque of each of the winding rollers W1 to W3 sets the winding roller W3 that the head end passes through last as a last-pass winding roller.

The following illustrates a distance calculation method, but not limited to this. As shown in Figure 2b, assuming that the distance between the steel strip detector D in front of the nip roll and the nip roll P (let it be DP) is known (can be measured on site after the steel strip coiler is installed), And, the geometric distance (or mechanical distance) between the steel strip detector D in front of the nip roll and the plurality of rolls W1, W2, and W3 (let's call them DW1, DW2, DW3). In FIG. 3, H is the distance between the axis of the mandrel M and the axis of the nip roll P; r _{M is} the radius of the mandrel M; and r _{P is} the radius of the nip roll P. Assume that θ ₀₁ , θ ₁₂ , and θ ₂₃ are the angles between the vertical line of the mandrel M and the different rolls W1, W2, and W3 (as shown in Figure 2b); α is the axis of the nip roll P and the mandrel M The angle of the horizontal included angle between the core line and the steel belt (not shown in FIG. 3), δ is the angle of the horizontal included angle of the steel belt (not shown in FIG. 3), and γ is the angle between the nip roller P and the mandrel M The angle of the vertical included angle of the axis line, L1 is the tangent distance between the steel belt (not shown in Figure 3) passing through the nip roller P and the spindle M, and H2 is the horizontal distance between the nip roller P and the spindle M). therefore:

L 1 = H cos α

γ = sin ^-1 H 2 / H

δ = 90- α - γ

Among them, the geometric distance from the steel strip detector D in front of the nip roll to the rolls W1, W2, W3 can also be added to the compensation ratio ε due to the thickness of the head end (the end of the steel strip after coiling and the surface of the steel strip The angle between them can be obtained through a limited number of experiments), in order to estimate the length and distance of the travel of each turn of the steel strip during coiling.

Please refer to FIG. 1 again. In the estimation step S12, the controller can calculate a first time when the predetermined torque of the last-pass roll (such as W3 in FIGS. 2a to 2l) is greater than a torque threshold. And a time difference between the head end and a second time before passing through the steel strip detector of the nip roll, and the end-pass roll is estimated based on the time difference and the distance measurement value (as shown in FIG. 2b). W3) and a steel strip detector (such as H in Fig. 2b) before the nip roll, and based on the gap, it is estimated that the head end of the steel strip corresponds to passing through the rolls. This passage period of each roll.

In an embodiment, as shown in FIG. 2b, the controller may periodically obtain the load torque of the end-pass roll; and the predetermined torque may be that the end-pass roll just passed the clamp at the head end. An average value of several load torques during a sampling period (for example, 30 to 80 milliseconds) after the steel strip detector D in front of the roller. Thereby, a better load torque sampling effect can be obtained.

In an embodiment, the torque threshold may be a product of the predetermined torque and a collision coefficient, and the collision coefficient is between 1.8 and 1.95. Thereby, a better pressure regulating effect of the steel strip roll can be obtained.

In an embodiment, the controller may set the roll W1 that the head end passes first as a through roll according to the load torque variation of the rolls W1 to W3, and pass the roll at the head end. After the first pass roll (such as W1 in Figures 2a to 2l), a waiting time (such as 90 to 110 milliseconds) elapses Then calculate the time difference between the first time and the second time. Thereby, a better pressure regulating effect of the steel strip roll can be obtained.

Please refer to FIGS. 1 and 2a to 2l again. In the pressure control step S2, the controller can control the pressure modes of the steel rolls T by the rolls W1 to W3, so that the head end corresponds to the rolls that pass through. The roller (W1 or W2 or W3) exhibits a normal pressure status outside the passing period and exhibits a reducing pressure status during the passing period.

For example, as shown in FIG. 2b, when the head end of the steel strip T passes the steel strip detector D in front of the nip roll, the controller may control the rolls W1 to W3 to generate a normal pressure pressure. The value can be, for example, 60KN; the controller can control the individual coils at a position of 100 millimeters (mm) or the corresponding position before the head end of the steel strip T is estimated to pass through the individual coil rolls (taking W1 as an example). The pressure is released by the roller (taking W1 as an example) to show the decompression state. It is estimated that at the position of 100 mm or the corresponding position after the head end of the steel strip T leaves the respective roll (using W1 as an example), the control The device can control the individual rolls (take W1 as an example) to perform re-pressing to show the normal pressure state.

In an embodiment, a pressure value of the roller passing through the head end in the depressurized state is a product of a pressure value in the normal pressure state and a depressurization coefficient. Between 0.7 and 0.9. Thereby, a better pressure regulating effect of the steel strip roll can be obtained.

Please refer to FIG. 4. The time at which the end of the conventional steel strip that has not been modified and operated according to the above method embodiment hits the roll (such as W3) is the circle of curve C11. After the operation method is modified by the above method embodiment, The time when the end of the steel strip hits the roll (such as W3) is the circle of curve C14. Observe the curves C13 (C14) and C11 to see that there is a time difference before and after the modification, and then compare the load of the roll (such as W3) with curve C12. It can be known that after the correction operation of the foregoing method embodiment, the time that the head end of the steel strip touches the roll (such as W3) is closer to the timing of the actual torque increase.

Please refer to FIG. 5. The start time of the above method embodiment is shown as the left circle of curve C24, and the end time of the above method embodiment is shown as the right circle of curve C24; right of curve C23 The circle shows the end of a single steel coil reel operation (such as the end of the head end or the opening of the roll, etc.); the trigger times for switching between Release and Restore (recovering normal pressure) are respectively as shown in the upper and lower curves of C25. As shown in the circle below, the definition of time point of curve C25 is related to curves C21 and C22. In this way, it can be ascertained that during the test of the method embodiment, the pressure relief and recompression of the roll The (normal pressure) state alternates.

Please refer to Figures 6a, 6b, and 6c. The three rolls (such as W1, W2, and W3) of the steel strip coiler are subjected to the surge caused by the head-end collision of the steel strip during the online test. It can be seen from the figure that the amplitude of the surge of the experimental group (the thicker curve, which represents the roll to which the above method embodiment is applied) is mostly lower than the amplitude of the surge of the control group (the thinner curve, which represents the conventional roll). It is shown that the embodiment of the method described above can indeed reduce the force of the head end of the steel strip colliding with the roll.

In addition, according to the above embodiments of the present invention, the above method embodiments can be implemented as a computer program product, which can be written using a programming language (such as C or Java, etc.), and the computer program product can be stored in a computer readable Storage devices, such as optical discs, when a computer (such as a controller with program execution capability) is loaded into a computer program product in the storage device, the method embodiment can be executed according to the computer program product.

When the above embodiments of the present invention are applied to a steel strip reel, the conventional method such as jumping or holding pressure is replaced by a pressure reduction method when the roller passes at the head end of the steel belt, so that the head end of the steel belt passes through each roller The smaller the pressure, the smaller the surge generated by the collision, and the less likely it is to leave gouge marks; moreover, the rolls will restore the pressure on the steel strip after the head ends leave, and there will be no loose coils; and, The response time of the pressure reduction of each roll is shorter than the response time of the jump, which can avoid the situation caused by the insufficient response speed of the jump. If the method of the above embodiment of the present invention is introduced into an existing steel coil reel, the shortcomings of the conventional coil control method can be improved to reduce the defective rate of steel coil reel, improve the quality of the steel coil product, and reduce the steel Scrap coil scrap rate and product cost.

Although the present invention has been disclosed in a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. The scope of protection shall be determined by the scope of the attached patent application.

Claims (7)

A method for regulating the pressure of a steel strip coil is applicable to a steel strip coiler. The steel strip coiler includes a mandrel, a plurality of rolls, and a controller, and the controller is electrically coupled to the mandrel and the The method includes the steps of: causing a steel strip to be circulated between the mandrel and the roll by the controller, and predicting that one end of the steel strip passes through the plurality of rolls correspondingly. A passing period of each of the rolls; and a pressure mode of the steel roll controlled by the controller to the steel strip, so that the roll corresponding to the head end passes a normal pressure state outside the passing period and During the passing period, a reduced pressure state is presented; wherein the controller is electrically coupled to a steel strip detector in front of a nip roll, and it is estimated that the head end of the steel strip passes through each of the plurality of rolls correspondingly. The step of the passing period of the non-reeling roller includes: the controller causes the head end to pass through the plurality of reeling rollers in a reeling stroke after passing through the front steel strip detector of the nip roller, during the reeling stroke Periodically increment a gauge value and set the head based on a load torque change of the rolls The last roll passed is a last-pass roll; and the controller calculates a first time that a predetermined torque of the last-pass roll is greater than a torque threshold and a time before the head end passes through the nip roll A time difference between a second time of the detector, and a gap between the end-pass roll and the steel strip detector in front of the pinch roll is estimated based on the time difference and the distance measurement value, and the basis The gap is used to predict the passing period of the head end of the steel strip corresponding to each of the plurality of rolls. The method for regulating the pressure of a steel strip roll as described in item 1 of the scope of the patent application, wherein a pressure value of the roll corresponding to the head end passing in the depressurized state is a pressure value under the normal pressure state and A product of a step-down coefficient, which is between 0.7 and 0.9. The method for regulating the pressure of a steel strip roll as described in item 1 of the scope of patent application, wherein the controller periodically obtains the load torque of the end-pass roll; and the predetermined torque is the end-pass roll at the head. An average value of several load torques within a sampling period immediately after the end passes through the steel strip detector in front of the nip roll. The method for regulating the pressure of a steel strip roll as described in item 1 of the scope of the patent application, wherein the torque threshold is a product of the predetermined torque and a collision coefficient, and the collision coefficient is between 1.8 and 1.95. The method for regulating the pressure of a steel strip roll as described in item 1 of the scope of the patent application, wherein the controller sets the roll passed first by the head end as a first pass according to the load torque variation of the plurality of rolls. The roll, after a waiting time has passed after the head end passes the first pass roll, the time difference between the first time and the second time is calculated. The method for regulating the pressure of a steel strip roll as described in item 5 of the scope of patent application, wherein the waiting time is 90 to 110 milliseconds. A computer program product. After the computer program product is loaded and executed by a computer, the computer can execute the method for regulating the pressure of a steel strip roll as described in item 1 of the scope of patent application.