CN109940050B - Online adjusting method for vertical loop roller system - Google Patents
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Abstract
The invention relates to an online adjusting method of a vertical loop roller system, which mainly solves the technical problem of black and gray defects on the surface of a tin plate. According to the invention, by utilizing the unit downtime, firstly, strip steel in the loop is extracted, the movable trolley of the loop is fixed along the rolling line direction, clearance between a loop side guide wheel and a track is corrected by a feeler gauge respectively, and the numerical value is controlled within 2 mm. And then, adjusting the mounting precision of the outlet loop fixed roller and the movable roller by a method of guiding the datum line, wherein the precision is controlled within 0.05mm/m, and levelness cross cannot occur between the two rollers. After the loop is threaded and the unit is started to operate, measuring the distances delta x between the strip steel and the two sides of the fixed loop roller respectively by using a ruler, and adjusting the verticality delta y of the roller according to the detection result value; or the planeness Delta z of the loop moving trolley is adjusted according to the detected value, thereby ensuring the accuracy of the loop roller system. The adjusting device is used for adjusting the vertical loop roller system of the specification of the thin material of the tin plate produced by the cold rolling factory.
Description
Technical Field
The invention relates to an on-line adjusting method of a vertical loop roller system, which is used for adjusting the vertical loop roller system with the specification (0.17 mm-0.55 mm) of a tin plate thin material produced by a cold rolling factory.
Background
The tin-plated product produced by a tin plating unit of a cold rolling mill is used for making beverages and food cans, and the black and gray defect on the surface of the tin-plated sheet is one of the main quality defects. The black ash is mainly generated in the production process of the tin plate, is a highly dispersed substance, is in a brownish yellow mist shape in serious cases, is not uniformly distributed, and is black powder when being wiped on the test paper. It not only affects the corrosion resistance and the aesthetic property of the product, but also seriously affects the binding force between the tin layer and the passive film and between the passive film and the paint, and particularly induces the generation of pitting corrosion after being covered by the paint (such as making beverage cans) when the black ash is serious. The defects seriously affect the quality of the strip steel and are a common problem of high-speed tinning wires at home and abroad.
Because the generation mechanism of the black and gray is not completely mastered, a uniformly recognized characterization method for the black and gray degree is not available, and the transverse comparison of various related researches is not facilitated, so that the research progress of the influence factors of the black and gray degree of the tin plate is relatively slow. In general, users can make claims by proposing quality objections according to the distribution uniformity of the black ash. The occurrence of uneven distribution of black and gray is related to equipment, process conditions and operation specifications, and is the result of the comprehensive action of a series of factors. Through long-time research and observation, the main reason for analysis is that the accuracy of an outlet loop roller system is not enough, so that the tinning plate and the loop roller are abnormally abraded, the surface of the tinning plate is uneven in black and dust, and the surface of the loop roller is also stained with irregular black and dust.
The tin-plated product produced by the tin plating unit of the cold rolling mill has the main quality defect that the limit specification tin-plated plate (the thickness of the tin-plated plate is less than or equal to 0.18mm, or the width of the tin-plated plate is more than or equal to 1046 mm) is easy to rib through an outlet loop. The reason for the ribbing of the tin plate is caused by the factors of roller convexity, roller system precision, loop trolley precision or plate type problems and the like, wherein the roller convexity and the plate type can be checked and processed in advance, but the roller system precision and the loop trolley precision are difficult to control, and no effective method is available for ensuring the precision. At present, in domestic Wu-Steel Xinri iron company, a tinning unit adopts a method that an export loop is not used to eliminate the two defects. However, after the outlet loop is cancelled, when the outlet is cut and split, the speed of the process section cannot be buffered, and only the speed can be reduced, so that the yield of the unit is limited. Although the method can solve the problems of black ash and rib, the disadvantages are obvious. Therefore, the unit needs an online adjustment method for the roller system of the vertical loop to solve the above problems.
Through retrieval, the specification of the chinese patent CN201410530853 "vertical loop rapid debugging method" describes a vertical loop rapid debugging method, which is used for shortening the installation and debugging time of a loop moving frame, is not used for actual performance application data of a production line about the operation and quality state of strip steel, and is not used for measuring and adjusting steps and methods related to a vertical loop roll system.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects in the prior art and provide a roller system adjusting method of a vertical loop, and the thought of the invention is as follows: firstly, the machine set is stopped, firstly, the strip steel in the loop is drawn out, the movable trolley of the loop is fixed along the rolling line direction, the clearance between the side guide wheel and the side guide wheel of the loop and the track is respectively corrected by a feeler gauge, and the numerical value is controlled within 2 mm. And then, adjusting the mounting precision of the outlet loop fixed roller and the movable roller by a method of guiding the datum line, wherein the precision is controlled within 0.05mm/m, and levelness cross cannot occur between the two rollers. After the loop is threaded and the unit is started to operate, measuring the distances delta x between the strip steel and the two sides of the fixed loop roller respectively by using a ruler, and adjusting the verticality delta y of the roller according to the detection result value; or the planeness delta z of the loop moving trolley is adjusted according to the detection value, so that the accuracy of a loop roller system is ensured, and the phenomenon of uneven black and gray or rib rising of the tin plate caused by deviation is thoroughly eliminated.
In order to solve the technical problem, the technical scheme of the invention is as follows, the on-line adjusting method of the vertical loop roller system comprises the following steps:
firstly, when the unit is shut down, firstly, strip steel in a loop is drawn out, a loop moving trolley is fixed along the direction of a rolling line by tools such as a chain block and the like, clearance between a loop side guide wheel and a track is measured by a feeler gauge respectively, and data is recorded; and the flatness of the movable sleeve moving trolley is corrected, and the gaps among the side guide wheels, the side guide wheels and the rails are adjusted to be uniform, the numerical values are less than or equal to 2mm, and the gap error is less than 0.5 mm.
And secondly, detecting the levelness of all the fixed loop rollers by using a level meter or a rocker arm beating method, and adjusting the corresponding rollers according to the detection result data, wherein the precision is controlled within 0.05 mm/m.
And thirdly, detecting the levelness of the movable loop rollers of all the loop travelling trolleys through a level gauge, and ensuring that levelness cross cannot occur between the two rollers.
And fourthly, detecting the verticality of the first fixed loop roller by a reference line method, and then detecting and adjusting other fixed loop rollers by an isometric method, wherein the precision is controlled within 0.05 mm/m.
The most advanced tinning wire in China can generally achieve the steps, but under the normal production condition, the problems of uneven black ash distribution and raised rib quality on the surface of the tinning plate in the loop cannot be solved. Therefore, the precision of the loop roller system is required to be adjusted on line according to the actual running state of the strip steel in the loop.
Fifthly, when the unit normally operates, the distance △ x between the two sides of the strip steel and the edge of the fixed loop roller is respectively measured by a ruler1And △ x2See fig. 4, data is recorded.
The fixed loop roller for determining the deviation of the strip steel can have the following three conditions:
first case, if △ x1－△x2Less than or equal to 10mm, and the deviation prevention of the strip steel in the loop can be evaluated;
in the second case, if 10mm < △ ×1－△x2If the deviation of the central line of the strip steel is A, the angle between the central line of the strip steel and the rolling line is α, the width of the strip steel is B, and d is the diameter of the fixed loop roll, the offset △ y of the central line of the loop roll can be expressed as follows:
wherein,
,
②
the Δ y values are:
if Δ y is positive, it indicates that the center of the roll is offset in the direction of the inlet at the side DS; if the Δ y value is negative, it indicates that the center of the roll is shifted in the direction of the exit from the DS side. At this time, the quantity that can obtain the straightness that hangs down of loop roller according to the numerical value needs the adjustment is:
S=△y*Lx*80% ④
wherein L isxThe distance between two bearing stops of the loop roller is 80 percent of the accumulated empirical value of the actual performance.
Namely, under the normal running condition of the unit, the deviation S of the bearing seat of the roller is adjusted, and the deviation of the strip steel can be quickly controlled within the precision range. If S is a positive value, adjusting the DS side bearing seat of the loop roll to the outlet direction (or adjusting the WS side bearing seat of the loop roll to the inlet direction); if S is negative, the DS side bearing of the looper roll is adjusted to the inlet direction (or the WS side bearing of the looper roll is adjusted to the outlet direction).
Note that the amount of offset △ S that can be adjusted is limited due to the small amount of clearance in the screw holes that fix the looper roll bearings, if the roll single bearing offset △ S is adjusted1< S, it is necessary to readjust the other bearing seat to be deviated △ S in the opposite direction2Ensuring △ S1＋△S2= S ⑤
△ x in the third case1－△x2Not less than 30mm, the planeness of the moving trolley needs to be adjusted.
It is noted that in high-speed tinning units at home and abroad, the deviation correcting rollers are generally arranged behind the vertical loop, whether the deviation of the strip steel is too large is judged, and the deviation correcting value display value of the CPC is directly seen. If the deviation correction amount is more than or equal to 15mm, the production requires stopping to adjust the roller system. Actually, the actually measured deviation A of the central line of the strip steel
) The correction amount is more accurate than the correction amount, and the following adjustment data is based on the measured value A.
Assuming that the deviation of the central line of the strip steel is A, the angle between the central line of the strip steel and the rolling line is alpha, the width of the strip steel is B, and d is the roll diameter of the fixed loop roll, the planeness offset delta z of the loop moving trolley is as follows:
wherein,
,
the values of Δ z are:
if the △ z-value is positive, it indicates that the loop mobile carriage is out of flatness in the DS side direction, and if the △ z-value is negative, it indicates that the loop mobile carriage is flatThe face is offset downward on the DS side. At this time, the quantity S of the movable trolley needing to be adjusted can be obtained according to the numerical valuezComprises the following steps:
Sz=△z*Lz*80% ⑧
wherein L iszThe distance between two counterweight steel wire rope studs of the loop moving trolley is 80 percent of the experience value accumulated by using actual results.
Next, the angle W by which the steel wire rope M90 × P6 stud needs to rotate is obtained as:
W=Sz／6×360°= △z*Lz／6×80% ×360° ⑨
namely, under the normal operation condition of the unit, the stud is fixed and the nut is loosened by utilizing the non-sleeve-punching and sleeve-releasing time period of the loop moving trolley, and the nut is rotated by an angle W. If the delta x is a positive value, adjusting the stud nut to rotate in the anticlockwise direction; and if the delta x is a negative value, adjusting the stud nut to rotate clockwise.
The invention has the beneficial effects that: the invention provides a vertical loop roller system adjusting method aiming at the specification (0.17 mm-0.55 mm) of thin materials for producing cold-rolled tin plates, which is to adjust the precision of a loop roller system by a conventional mechanical method, then adjust the precision of the loop roller system on line by the mechanical method after measurement and calculation according to the running deviation state of strip steel under the normal production condition, and avoid the defects of uneven black ash on the surfaces of the tin plates and the quality of raised ribs. By applying the on-line adjustment method of the vertical loop roller system, the vertical loop roller system can be controlled within a functional precision range, and the defects of uneven black ash and raised rib quality on the surface of the tin plate in the loop are thoroughly eliminated.
Drawings
FIG. 1 is a schematic view of a vertical looping roller system.
Fig. 2 is a front view of the vertical loop mobile cart.
Fig. 3 is a schematic diagram of a vertical loop travelling car and a counterweight wire rope.
FIG. 4 is a schematic diagram of a method of adjusting a looper roll.
In the figure: 1-a motor; 2-reduction box, 3-winch; 4-a drive device; 5-hoisting the steel wire rope; 6-counterweight steel wire rope; 7-counterweight; 8-looping moving trolley; 9-looping fixed trolley; 10-a vertical loop steel structure; 11-side guide wheels; 12-a side guide wheel; 13-vertical rails; 14-a fastening assembly; 15-movable loop roller, 16-fixed loop roller.
Detailed Description
As shown in fig. 1 to 4, the present embodiment relates to a vertical loop roll system, which includes: a fixed loop roller 16 arranged at the bottom, a loop moving trolley 8, a loop fixed trolley 9, a movable loop roller 15 (diameter d, roller body length L, distance L between two bearing baffles) arranged on the moving trolleyx) The driving device 4 (comprising a motor 1, a speed reducer 2, a winch 3 and a winch steel wire rope 5) for providing strip steel tension and a steel structure 10 for supporting a top mechanical device are arranged on the ground, the winch steel wire rope 5 is used for pulling the loop moving trolley 8 to ascend and descend along a vertical rail 13, the weight of the loop moving trolley 8 is compensated and balanced by the counterweight 7, one end of the counterweight steel wire rope 6 is connected to the middle of the edge of the loop moving trolley 8 through a fastening component 14 (a stud, a nut and a nut of M90 × P6), the other end of the counterweight steel wire rope is connected with the counterweight 7, and the distance L between two studs of the counterweight steel wire ropes 6z. In the direction perpendicular to the unit datum line, two sides of the loop moving trolley 8 respectively clamp a vertical rail 13 by 4 side guide wheels 12 and 2 side guide wheels 11.
When the unit is stopped, firstly, the strip steel in the loop is drawn out, a movable trolley of the loop is fixed along the rolling line direction by tools such as a chain block and the like, clearance between a loop side guide wheel and a track is measured by a clearance gauge respectively, and data is recorded.
Firstly, correcting the flatness of the loop moving trolley. The adjustment makes the gaps among the side guide wheel, the side guide wheel and the track uniform, the numerical values are all less than or equal to 2mm, and the gap error is less than 0.5 mm.
And secondly, detecting the levelness of all the fixed loop rollers by using a level meter or a rocker arm beating method, and adjusting the corresponding rollers according to the detection result data, wherein the precision is controlled within 0.05 mm/m.
And thirdly, detecting the levelness of the movable loop rollers of all the loop travelling trolleys through a level gauge, and ensuring that levelness cross cannot occur between the two rollers.
And fourthly, detecting the verticality of the first fixed loop roller by a reference line method, and then detecting and adjusting other fixed loop rollers by an isometric method, wherein the precision is controlled within 0.05 mm/m.
When the unit is in normal operation, the distance △ x between two edges of the strip steel and the edge of the fixed loop roller is measured by a ruler1And △ x2See fig. 1, data is recorded.
Firstly, determining a fixed loop roller with which the strip steel begins to deviate, wherein the following three conditions may exist:
first case, if △ x1－△x2Less than or equal to 10mm, and the deviation prevention of the strip steel in the loop can be evaluated;
in the second case, if 10mm < △ ×1－△x2If the deviation of the central line of the strip steel is A, the angle between the central line of the strip steel and the rolling line is α, the width of the strip steel is B, and d is the diameter of the fixed loop roll, the offset △ y of the central line of the fixed loop roll can be expressed as follows:
wherein,
,
②
the delta y values can be estimated as:
if Δ y is positive, it indicates that the center of the roll is offset in the direction of the inlet at the side DS; if the Δ y value is negative, it indicates that the center of the roll is shifted in the direction of the exit from the DS side. At this time, the number of the loop roller verticality required to be adjusted can be obtained according to the numerical value:
S=△y*Lx*80% ④
wherein L isxIs a fixed activityThe distance between the two bearing stops of the sleeve roller is 80 percent of the experience value accumulated by actual performance.
Namely, under the normal running condition of the unit, the deviation S of the bearing seat of the roller is adjusted, and the deviation of the strip steel can be quickly controlled within the precision range. If S is a positive value, adjusting the bearing seat on the DS side of the fixed looper roll to the outlet direction (or the bearing seat on the WS side of the fixed looper roll to the inlet direction); if S is a negative value, the DS side bearing of the fixed looper roll is adjusted in the inlet direction (or the WS side bearing of the fixed looper roll is adjusted in the outlet direction).
Note that the amount of offset △ S that can be adjusted is limited due to the small amount of clearance in the screw holes that fix the looper roll bearings, if the roll single bearing offset △ S is adjusted1< S, it is necessary to readjust the other bearing seat to be deviated △ S in the opposite direction2Ensuring △ S1＋△S2= S ⑤
△ x in the third case1－△x2The flatness of the loop moving trolley needs to be adjusted when the diameter is more than or equal to 30 mm.
It is noted that in high-speed tinning units at home and abroad, the deviation correcting rollers are generally arranged behind the vertical loop, whether the deviation of the strip steel is too large is judged, and the deviation correcting value display value of the CPC is directly seen. If the deviation correction amount is more than or equal to 15mm, the production requires stopping to adjust the roller system. Actually, the actually measured deviation A of the central line of the strip steel
) The correction amount is more accurate than the correction amount, and the following adjustment data is based on the measured value A.
Assuming that the deviation of the central line of the strip steel is A, the angle between the central line of the strip steel and the rolling line is alpha, the width of the strip steel is B, and d is the roll diameter of the fixed loop roll, the planeness offset delta z of the loop moving trolley is as follows:
wherein,
,
the values Δ z can be estimated as:
if the △ z value is positive, the flatness of the loop mobile car is deviated upwards on the DS side, and if the △ z value is negative, the flatness of the loop mobile car is deviated downwards on the DS sidezComprises the following steps:
Sz=△z*Lz*80% ⑧
wherein L iszThe distance between two counterweight steel wire rope studs of the loop moving trolley is 80 percent of the experience value accumulated by using actual results.
Next, the angle W of the stud nut needing to be rotated by the steel wire rope M90 × P6 is:
W=Sz／6×360°= △z*Lz／6×80% ×360° ⑨
namely, under the normal running condition of the unit, the stud is fixed and the nut is loosened by utilizing the non-sleeve punching and sleeve releasing time period of the loop moving trolley, and the stud nut is rotated by an angle W. If the delta x is a positive value, adjusting the stud nut to rotate in the anticlockwise direction; and if the delta x is a negative value, adjusting the stud nut to rotate clockwise.
By applying the on-line adjustment method of the vertical loop roller system, the vertical loop roller system can be controlled within a functional precision range, and the defects of uneven black ash and raised rib quality on the surface of the tin plate in the loop are thoroughly eliminated.
Taking actual data as an example, the unit normally produces 0.18mm 835mm tin-plated plates, and the distances △ x between the two sides of the strip steel and the edges of the fixed loop rollers are respectively measured by using a ruler1And △ x2See fig. 4, data is recorded.
Suppose measured Max (△ x)1＝280mm，△x2285mm) due to △ x1－△x2< 10mm, so it can be evaluatedThe strip steel does not deviate in the loop.
Suppose measured Max (△ x)1＝290mm，△x2275mm) since 10mm < △ x1－△x2If the angle is less than 30mm, the perpendicularity of the fixed looper roll needs to be adjusted on line, and then the offset △ y of the central line of the fixed looper roll can be obtained according to a formula ①②③ as follows:
since Deltay > 0, this indicates that the center of the roller is shifted 30mm toward the inlet in the direction of the DS side. The quantity of the loop roller required to be adjusted can be calculated according to a formula IV:
S=△y*Lx*80% =30mm*1.6*80%= 38.4mm
wherein L isxIs the distance between two bearing blocks of the looper roller, LxAt 1.6m, 80% are empirical values accumulated using actual performance.
That is, under normal operating conditions of the unit, the adjustment looper DS-side bearing set is offset S in the outlet direction (or the looper WS-side bearing set is offset S in the inlet direction) to ensure a total adjustment S =38.4 mm. Therefore, the band steel can not deviate in the loop quickly.
Suppose measured Max (△ x)1＝235mm，△x2330mm), then the loop mobile cart flatness offset △ z can be derived from equation ⑥⑦ as:
wherein L iszThe distance between two counterweight steel wire ropes and studs of the looping travelling car, Lz＝2.8m。
Since △ z is less than 0, it indicates that the flatness of the loop moving trolley deviates downwards at DS side, and the quantity S of loop moving trolley needing to be adjusted can be calculated according to formula ⑧zComprises the following steps:
Sz=△z*Lz*80%=851.2mm
next, the angle W by which the stud of the wire rope M90 × P6 needs to be rotated can be calculated as:
W=Sz/6 × 360 ° = 851.2/6 × 360 ° =141 circles + 309 degrees
Under the normal operation condition of the unit, the movable sleeve moving trolley is utilized to fix the stud and loosen the cap in the non-sleeve-punching and sleeve-releasing period, and the stud nut is adjusted to rotate 141 circles + 309 degrees clockwise. Therefore, the band steel can not deviate in the loop quickly.
Claims (2)
1. An on-line adjusting method of a vertical loop roller system is characterized in that: the method comprises the following steps:
firstly, when the unit is shut down, firstly, strip steel in a loop is drawn out, a loop moving trolley is fixed by a chain block along the direction of a rolling line, clearance between a loop side guide wheel and a track is measured by a clearance gauge, and data is recorded; correcting the flatness of the movable sleeve moving trolley, and adjusting to ensure that gaps among the side guide wheels, the side guide wheels and the track are uniform, the numerical values are less than or equal to 2mm, and the gap error is less than 0.5 mm;
secondly, detecting the levelness of all the fixed loop rollers by a level meter or a rocker arm beating method, and adjusting the corresponding rollers according to the detection result data, wherein the precision is controlled within 0.05 mm/m;
thirdly, detecting the levelness of all loop travelling trolleys and all loop rollers through a level gauge to ensure that levelness cross cannot occur between the two rollers;
fourthly, detecting the verticality of the first fixed loop roller by a reference line method, and then detecting and adjusting other fixed loop rollers by an isometric method, wherein the precision is controlled within 0.05 mm/m;
fifthly, when the unit normally operates, the distance △ x between the two sides of the strip steel and the edge of the fixed loop roller is respectively measured by a ruler1And △ x2Recording data;
(1) if △ x1－△x2Less than or equal to 10mm, and the deviation prevention of the strip steel in the loop can be evaluated;
(2) if 10mm < △ x1－△x2If the deviation of the central line of the strip steel is A, the angle between the central line of the strip steel and the rolling line is α, the width of the strip steel is B,d is the fixed looper roll diameter and L is the roll body length, then the looper center line offset △ y is expressed as:
wherein,
,
the Δ y values are:
if Δ y is positive, it indicates that the center of the roll is offset in the direction of the inlet at the side DS; if the value of Deltay is negative, it indicates that the center of the roll is shifted in the direction of the exit from the side DS; at this time, the quantity that needs to be adjusted to obtain the perpendicularity of the fixed looper roller according to the numerical value is:
S=△y*Lx*80%
wherein L isxThe distance between two bearing blocks of the fixed loop roller is set, and 80 percent of the distance is an experience value actually accumulated in use;
namely, under the normal running condition of the unit, the deviation S of the bearing seat of the roller is adjusted, the deviation of the strip steel can be controlled within the precision range, and if the S is a positive value, the DS side bearing seat of the fixed looper roller is adjusted towards the outlet direction; if S is a negative value, adjusting the DS side bearing seat of the fixed looper roller to the inlet direction;
if the roller unilateral bearing offset △ S is adjusted1< S, it is necessary to readjust the other bearing seat to be deviated △ S in the opposite direction2Ensuring △ S1＋△S2= S
（3）△x1－△x2The flatness of the loop moving trolley needs to be adjusted when the diameter is more than or equal to 30 mm.
2. A stand according to claim 1The online adjustment method of the loop roller system is characterized in that if the diameter of 10mm is less than △ x1－△x2If the deviation of the central line of the strip steel is A, the angle between the central line of the strip steel and the rolling line is α, the width of the strip steel is B, and d is the diameter of the fixed loop roller, the planeness offset △ z of the loop moving trolley is as follows:
wherein,
,
the values of Δ z are:
if the △ z value is positive, the flatness of the loop mobile car is deviated in the DS side, if the △ z value is negative, the flatness of the loop mobile car is deviated in the DS side, and at the moment, the quantity S of the mobile car to be adjusted can be obtained according to the valueszComprises the following steps:
Sz=△z*Lz*80%
wherein L iszThe distance between two counterweight steel wire rope studs of the loop moving trolley is 80 percent of the actually accumulated experience value;
next, the angle W of rotation of the steel wire rope M90 × P6 stud nut is obtained as follows:
W=Sz／6×360°= △z*Lz／6×80% ×360°
under the normal running condition of the unit, utilizing the loop moving trolley to break and release the loop in the non-loop period, loosening the stud nut and the nut, and rotating the stud nut by an angle W; if the delta x is a positive value, adjusting the stud nut to rotate in the anticlockwise direction; and if the delta x is a negative value, adjusting the stud nut to rotate clockwise.
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| CN201910249529.XA CN109940050B (en) | 2019-03-29 | 2019-03-29 | Online adjusting method for vertical loop roller system |
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| CN110904483B (en) * | 2019-11-29 | 2021-03-16 | 武汉钢铁有限公司 | Adjusting tool and adjusting method for electrogalvanizing anode box by vertical gravity method |
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