阅读说明：本技术 一种带钢抛尾过程中防止入口逃带的方法 (Method for preventing strip entrance from escaping in strip steel tail throwing process ) 是由 谢邦立 曹绪铖 史素红 丁荣浩 陈宗仁 谢向群 于 2018-06-27 设计创作，主要内容包括：本发明涉及一种带钢抛尾过程中防止入口逃带的方法,开卷机开卷时,控制系统实时计算开卷机芯轴上的钢卷卷径D<Sub>实时卷径</Sub>；控制系统对实时计算的钢卷卷径D<Sub>实时卷径</Sub>按照预设周期取值1次,该取值卷径为D<Sub>取值卷径</Sub>,并用该取值D<Sub>取值卷径</Sub>计算剩余带钢长度L<Sub>剩余长度</Sub>；其中,当开卷机上剩余带钢长度L<Sub>剩余长度</Sub>大于或等于200米时,控制系统按照开卷机每转1圈取值1次；当开卷机上剩余带钢长度L<Sub>剩余长度</Sub>小于200米时,控制系统按照开卷机每转3圈取值1次；开卷机根据所述剩余带钢长度L<Sub>剩余长度</Sub>进行降速甩尾过程。本发明能够消除由于带钢内圈打滑而造成的卷径计算值的波动,更好的控制抛尾降速过程。(The invention relates to a method for preventing an inlet from escaping from a strip in the process of strip steel tailing discarding, wherein when an uncoiler uncoils, a control system calculates the coil diameter D of a steel coil on a mandrel of the uncoiler in real time Real-time coil diameter (ii) a Control system calculates the coil diameter D of the steel coil in real time Real-time coil diameter Taking the value for 1 time according to a preset period, wherein the roll diameter is D Diameter of rolling And using the value D Diameter of rolling Calculating the length L of the residual strip steel Residual length (ii) a Wherein, when the length L of the residual strip steel on the uncoiler Residual length When the length is greater than or equal to 200 meters, the control system takes 1 value for 1 time according to 1 turn of the uncoiler; when the length L of the residual strip steel on the uncoiler Residual length When the length is less than 200 m, the control system uncoilsThe value is taken for 1 time after the machine rotates for 3 circles; the uncoiler is used for uncoiling the strip steel according to the length L of the residual strip steel Residual length And carrying out a speed reduction tail flicking process. The invention can eliminate the fluctuation of the calculated value of the coil diameter caused by the slipping of the inner ring of the strip steel and better control the tail throwing and speed reducing process.)

1. A method for preventing an entrance from escaping from a strip in the process of strip steel tailing discarding is characterized in that:

when the uncoiler uncoils, the control system calculates the coil diameter D of the steel coil on the mandrel of the uncoiler in real time_{Real-time coil diameter}；

Control system calculates the coil diameter D of the steel coil in real time_{Real-time coil diameter}Taking value for 1 time according to N turns per turn of the uncoiler, wherein the coil diameter is D_{Diameter of rolling}And using the value D_{Diameter of rolling}Calculating the length L of the residual strip steel_{Residual length}(ii) a Wherein, when the length L of the residual strip steel on the uncoiler_{Residual length}When the length is greater than or equal to 200 meters, the control system takes 1 value for 1 time according to 1 turn of the uncoiler; when the length L of the residual strip steel on the uncoiler_{Residual length}When the length is less than 200 m, the control system takes 1 time according to 3 turns of the uncoiler;

the uncoiler is used for uncoiling the strip steel according to the length L of the residual strip steel_{Residual length}Performing a speed reduction and tail flicking process when the length L of the residual strip steel_{Residual length}And when the length of the steel strip is less than the preset length, stopping the uncoiler, cutting and welding the steel strip at the inlet, and entering the next process flow.

2. The method of claim 1 for preventing entrance strip escape during strip tail-casting, comprising: control system calculates the coil diameter D of the steel coil in real time_{Real-time coil diameter}After value taking, if the current value is the volume diameter D_{Diameter of rolling}If the difference value between the current value and the previous value roll diameter exceeds the preset range, the previous value roll diameter plus 2 x N x h is taken as the current value roll diameter D_{Diameter of rolling}To calculate the length L of the residual strip steel_{Residual length}Wherein h is the thickness of the strip steel.

3. The method of claim 1 for preventing entrance strip escape during strip tail-casting, comprising: a detection grating is installed before the double-cutting shear, and when the detection grating detects that the strip steel is from 'present' to 'absent', a control system triggers a stop signal, and the field equipment stops in time.

Technical Field

The invention relates to a method for preventing strip steel from escaping from an inlet in a tail throwing process, and belongs to the technical field of strip steel rolling.

Background

The uncoiler is the main inlet device on a strip production line, and is widely applied to strip steel production and colored strip production. The uncoiler is used for supporting a steel coil, opening the steel coil and conveying strip steel and comprises a transmission motor, a speed reducer, a mandrel, a collapsible oil cylinder, a fixed base and the like. The core shaft consists of a sector block, a sliding sleeve, a shaft, a movable sleeve rod and the like; the mandrel can reach a necessary expansion and contraction working range through the work of the rotary hydraulic cylinder, so that the effects of fixing a steel coil and stabilizing the tension of the uncoiler are achieved, and the phenomenon that the strip steel slips in the running process is prevented.

When the uncoiler normally operates, the computer control system can calculate the length of the residual strip steel on the mandrel in real time, and the tail flicking process is carried out according to the length of the residual strip steel. The purpose of the tail flicking process is as follows: when the residual length of the steel coil on the mandrel of the uncoiler is less than a set length (about 30 meters), the uncoiler can accurately stop running.

The method for calculating the length of the remaining steel coil generally comprises the following steps: and calculating the coil diameter of the steel coil on the uncoiler according to the speed of the front tension roller of the uncoiler and the rotation speed difference of the uncoiler, thereby calculating the residual length of the strip steel on the mandrel of the uncoiler. However, in the actual production process on site, errors in calculating the residual length often occur, so that the strip steel on the mandrel has no residual length, and the strip escaping production shutdown accident of the inlet uncoiler occurs. This is because the general calculation technique for the remaining length of the strip steel of the uncoiler is based on the ideal situation, but does not satisfy some abnormal situations, such as: the incoming steel coil may have a coring phenomenon, that is: because the incoming steel coil head has quality defects, the head part with poor inner center needs to be manually cut off on site, so that the inner diameter of the incoming steel coil is larger than 420 mm; and the default internal diameter of the expanded mandrel is 420mm, so that the phenomenon of strip steel slipping can occur in the uncoiling process, and then the phenomena of loss of inlet section tension, incapability of meeting the requirement of tail throwing precision and strip tail escaping can occur.

Disclosure of Invention

The invention aims to solve the technical problems that: the control method for preventing the entrance from escaping from the strip in the steel tail throwing process so as to ensure that the strip steel meets the tail throwing precision requirement is provided.

In order to solve the technical problems, the technical scheme provided by the invention is as follows: a method for preventing an entrance from escaping from a strip in a strip steel tailing discarding process comprises the following specific steps: when the uncoiler uncoils, the control system calculates the coil diameter D of the steel coil on the mandrel of the uncoiler in real time_{Real-time coil diameter}；

Control system calculates the coil diameter D of the steel coil in real time_{Real-time coil diameter}Taking value for 1 time according to N turns per turn of the uncoiler, wherein the coil diameter is D_{Diameter of rolling}And using the value D_{Diameter of rolling}Calculating the length L of the residual strip steel_{Residual length}(ii) a Wherein, when the length L of the residual strip steel on the uncoiler_{Residual length}When the length is greater than or equal to 200 meters, the control system takes 1 value for 1 time according to 1 turn of the uncoiler; when the length L of the residual strip steel on the uncoiler_{Residual length}When the length is less than 200 m, the control system takes 1 time according to 3 turns of the uncoiler;

the uncoiler is used for uncoiling the strip steel according to the length L of the residual strip steel_{Residual length}Performing a speed reduction and tail flicking process when the length L of the residual strip steel_{Residual length}And when the length of the steel strip is less than the preset length, stopping the uncoiler, cutting and welding the steel strip at the inlet, and entering the next process flow.

The method for calculating the residual length by the uncoiler of the computer control system generally adopts the actual rotating speed measured by a motor encoder of the uncoiler, the linear speed of a front measuring roller (tension roller) and the thickness of strip steel to calculate, belongs to the conventional and public technology, and is not described any more. However, the conventional calculation method is based on an ideal situation, and the deviation of the calculated length due to slipping or tension fluctuation in practical application is caused, so that the belt escape occurs. The accuracy of calculating the coil diameter of the steel coil by the uncoiler determines the accuracy of the residual length of the strip steel on the mandrel of the uncoiler, the invention adds different value frequencies to the coil diameter of the real-time steel coil of the uncoiler according to the difference of the residual length of the strip steel in a control system, which is equivalent to filtering out most of calculation errors caused by uninterrupted real-time sampling in the prior art, and aims to avoid strip escaping caused by inaccurate calculated value of the residual length of the strip steel due to the slippage of the strip steel in the speed reduction and tail flicking processes of the uncoiler, reduce the influence of secondary control defects caused by the slippage of the strip steel, better control the tail throwing and speed reduction processes of the uncoiler, effectively avoid the occurrence of the strip escaping phenomenon at an inlet, and ensure the stable and effective operation of a unit.

As mentioned above, although most of calculation errors have been avoided by the control system to sample the real-time steel coil of the uncoiler at intervals, it still cannot be excluded that the sampling point value is located exactly at the calculation error, and therefore, the above technical solution is further: control system calculates the coil diameter D of the steel coil in real time_{Real-time coil diameter}After value taking, if the current value is the volume diameter D_{Diameter of rolling}If the difference value between the current value and the previous value roll diameter exceeds the preset range, the previous value roll diameter plus 2 x N x h is taken as the current value roll diameter D_{Diameter of rolling}To calculate the length L of the residual strip steel_{Residual length}Wherein h is the thickness of the strip steel. Generally speaking, the difference between the previous roll diameter and the current roll diameter is less than 3mm, so if the difference between the previous roll diameter and the current roll diameter is greater than 10mm, we can consider that the current sampling point is located at the calculated error value.

In order to completely prevent the strip steel from escaping, the invention further comprises the following steps: through at the newly-increased detection grating of double shear entry as preventing to flee the detection device of taking control program, apply it to taking the tail to detect control system, better control decoiler process of throwing the tail, promptly: when the detection grating detects that the strip steel is from 'present' to 'absent', the control system triggers a shutdown signal, and the field equipment is stopped in time.

Drawings

The invention will be further explained with reference to the drawings.

Fig. 1 is a schematic diagram of the principle in an embodiment of the present invention.

Reference numerals: the device comprises an uncoiler 1, a tension roller 2, a double-shear 3, a detection grating 4 and strip steel 6.

Detailed Description