CN111570529B

CN111570529B - Automatic control method of coiling machine in emergency of strip breakage of fully-continuous hot-rolled thin strip line

Info

Publication number: CN111570529B
Application number: CN202010441193.XA
Authority: CN
Inventors: 李旭; 于加学; 谷德昊; 李影; 张殿华
Original assignee: Northeastern University China
Current assignee: Northeastern University China
Priority date: 2020-05-22
Filing date: 2020-05-22
Publication date: 2021-03-16
Anticipated expiration: 2040-05-22
Also published as: CN111570529A

Abstract

The invention provides an automatic control method of a coiler in an emergency situation of strip breakage of a fully-continuous hot-rolled thin strip line, which comprises the following steps of firstly dividing the type of the strip breakage into three situations according to the difference of strip breakage positions: breaking the strip before the first piece of steel enters a No. 2 coiler; the strip steel enters a 2# coiling machine, and needs to enter a 1# coiling machine for coiling after the strip is broken; the strip steel enters a 1# coiling machine, and needs to enter a 2# coiling machine for coiling after the strip is broken; according to the method, a one-key emergency treatment method under different conditions is realized by adopting a specific control method according to specific conditions through related mounted components and parts, unnecessary economic loss caused by the whole-line shutdown due to belt breakage is avoided, the time for treating scrap steel caused by stopping due to belt breakage is reduced, the time waste of restarting and organizing production is avoided, the production efficiency of a production line can be improved, and the production safety problem can be effectively avoided.

Description

Automatic control method of coiling machine in emergency of strip breakage of fully-continuous hot-rolled thin strip line

Technical Field

The invention relates to the technical field of steel rolling automatic control, in particular to an automatic control method of a coiler in an emergency situation of strip breakage of a fully-continuous hot-rolled thin strip line.

Background

In a fully continuous hot rolling thin strip production line, once the strip breakage condition of the front and the back of a rolling mill occurs, the normal automatic control time sequence of a coiling machine is disturbed, the coiling machine can rapidly respond to various emergency conditions and is one of important conditions for avoiding the rolling stop due to the unavailability, so that the orderly automatic action of each device can be ensured to be important under the emergency condition of strip breakage; in a conventional strip breakage emergency, all equipment is prepared by manual operation when a coiler area is switched to a manual mode, strip steel before and after a strip breakage position continues to advance on a roller way, a new strip steel head at the strip breakage position is quickly sent to the front of the coiler, an operator needs to operate the roller way, an upper pinch roll, a lower pinch roll, a winding drum, a wrapper roll, a guide plate and other equipment at the speed and press down actions in the emergency, operation steps are quite complex, and in emergency on-site emergency command is carried out, the operator needs to return all the equipment quickly, and even hands and feet are in disorder, so that the error rate of the operation method is basically more than ninety percent.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides an automatic control method of a coiler in an emergency situation of strip breakage of a fully continuous hot-rolled thin strip line, which divides the strip breakage into three situations according to the different strip breakage positions of strip steel on the fully continuous hot-rolled thin strip production line: firstly, strip steel before a rolling mill passes through the rolling mill and is broken before entering a 2# coiling machine; secondly, the strip steel before the rolling mill is not broken, after the strip steel is rolled by the rolling mill and waste materials are sheared by flying shears, the head of the new strip steel enters a 2# coiling machine for coiling, and after tension is established between a coiling block of the 2# coiling machine and a 2# pinch roll, the strip steel is broken in the process of coiling the strip steel by the 2# coiling machine; thirdly, the strip steel before the rolling mill is not broken and is coiled by a 2# coiling machine, and when the weight of the steel coil in the 2# coiling machine reaches the set coil weight H₂The method comprises the following steps that firstly, flying shears automatically shear, a coiling machine automatically switches, a new head of a sheared strip steel enters a 1# coiling machine to be coiled, and after a coiling drum of the 1# coiling machine and a 1# pinch roll establish tension, the strip steel is broken in the coiling process of the 1# coiling machine, and the 2# coiling machine has flying shear shearing operation relative to the 1# coiling machine besides basic automatic coiling;

the invention respectively provides different control methods aiming at the three belt breakage conditions:

for the first belt breakage condition, the automatic control method comprises the following steps:

step 1.1: after strip breakage, controlling the speed of a sheared roller way on the full-continuous hot-rolling thin strip production line to be increased to 1.5-4 times of the speed of strip steel for preparation, wherein the sheared roller way refers to all roller ways from the position of a flying shear to the position of a waste hopper in the horizontal direction of the full-continuous hot-rolling thin strip production line;

step 1.2: switching the flying shear in the automatic operation state into a manual operation state;

step 1.3: judging whether the length of the waste material is smaller than that of a waste material hopper, if so, manually controlling a flying shear to shear the waste material when the normal head of a first piece of steel runs to the flying shear position, and running the head of the sheared first piece of steel strip to a 2# coiling machine for automatic steel coiling under the driving of a roller way after shearing, wherein the first piece of steel strip is the first strip steel which comes out from the coiling machine and is not coiled before the coiling is finished;

if the length of the waste is larger than or equal to that of the waste hopper, the flying shears are manually controlled to perform a breaking operation to cut the waste short, the breaking operation is cancelled when the normal head of the first piece of steel moves to the position of the flying shears, and the head of the cut first piece of steel strip moves to a 2# coiling machine under the driving of a roller way after shearing to automatically coil the steel;

the waste material is an abnormal head of the first steel after the belt is broken, and whether the head of the first steel is normal or not is judged according to the quality inspection requirement in the production process;

step 1.4: the flying shear in the manual operation state is changed into an automatic operation state, the emergency treatment in the strip breakage state is completed, and the automatic coiling of the full-continuous hot rolling thin strip production line enters a normal automatic operation state;

for the second belt breakage condition, the automatic control method comprises the following steps:

step 2.1: the automatic control operation of flying shears is cancelled after the belt is broken;

step 2.2: controlling a No. 1 guide plate to be opened to an initial opening degree, and simultaneously controlling the No. 1 lower pinch roll to act to a rolling position, wherein the rolling position is the position of the lower pinch roll which can guide a new strip steel head into a No. 1 coiler;

step 2.3: when the No. 1 lower pinch roll is positioned at a rolling position, controlling the No. 1 upper pinch roll to be positioned to a steel feeding roll gap, wherein the steel feeding roll gap is 0.92-0.95 times of the thickness of the strip steel;

step 2.4: when the No. 1 hot metal detector does not detect the signal, controlling the No. 2 coiling machine to automatically increase the speed to 1.5 times of the current speed;

step 2.5: when the No. 2 hot metal detector does not detect the signal, establishing a tracking starting signal of the tail part of the strip steel positioned in the No. 2 coiling machine, and when the tracking distance of the tail part of the strip steel positioned in the No. 2 coiling machine is detected to be more than or equal to the distance from the No. 2 hot metal detector to the No. 2 wrapper roll, controlling the No. 2 coiling machine to stop;

step 2.6: the head of the new strip steel after strip breakage needs to enter a 1# coiling machine for coiling, a flying shear shearing signal is cancelled, after a 1# hot metal detector detects the signal again, a tracking starting signal of the head position of the new strip steel is established, emergency treatment under strip breakage is completed, and a 1# upper pinch roll, a 1# lower pinch roll, a 1# guide plate and a 1# coiling machine on a full-continuous hot rolling thin strip production line enter a normal automatic operation state;

for the third kind of belt breakage, the automatic control method comprises the following steps:

step 3.1: the automatic control operation of flying shears is cancelled after the belt is broken;

step 3.2: when the No. 1 hot metal detector does not detect the signal, controlling the No. 1 guide plate to be opened to the initial opening degree;

step 3.3: when the No. 1 hot metal detector does not detect the signal, establishing a tracking starting signal of the tail part of the strip steel positioned in the No. 1 coiling machine, and when the distance between the tracking starting signal and the tail part of the strip steel positioned in the No. 1 coiling machine is greater than or equal to the distance between the No. 1 hot metal detector and the No. 1 wrapper roll, controlling the No. 1 coiling machine to stop;

step 3.4: after the tail of the strip steel in the 1# coiler passes through the 1# pinch roll, controlling the 1# lower pinch roll to be switched to a switching position, and controlling the 1# upper pinch roll to be positioned to a roll gap of the switching position, wherein the roll gap of the switching position is 2-4 times of the thickness of the strip steel;

step 3.5: and (3) a new strip steel head after strip breakage needs to enter a 2# coiling machine for coiling, a flying shear shearing signal is cancelled, after the 2# hot metal detector detects the signal again, a tracking starting signal of the new strip steel head position is established, emergency treatment under strip breakage is completed, and the 2# upper pinch roll, the 2# lower pinch roll, the 2# guide plate and the 2# coiling machine on the full-continuous hot rolling thin strip production line enter a normal automatic operation state.

The fully continuous hot rolling thin strip production line is in the prior art.

The invention has the beneficial effects that:

the invention has proposed the automatic control method of the coiling machine under the emergency situation of the broken strip of a full continuous hot rolling thin strip line, according to the broken strip situation of different, have given different control schemes specifically, combine the concrete component, under the emergency situation of the broken strip, can intervene and realize the orderly coiling smoothly through a key, make every apparatus according to the different order rule control of the broken strip situation of each apparatus of the broken strip situation to the coiling area, the said control method has avoided the numerous operations of the handling emergency situation of operating personnel caused after the broken strip, greatly reduced the error of the probability that the operating personnel operate the complexity and cause, also avoided the manual handling to need the problem of stopping at the same time, not only can raise the production efficiency of the production line, can also avoid the production safety problem effectively;

the control method is applied to a certain full-continuous hot rolling thin strip production line, the obtained effect is very good, unnecessary economic loss caused by strip breakage and casting stop of strip steel is avoided, the time for treating scrap steel caused by strip breakage and casting stop is reduced, and meanwhile, huge loss caused by strip breakage and casting stop is reduced.

Drawings

FIG. 1 is a schematic view of a portion of a fully continuous hot strip rolling line of the present invention.

Fig. 2 is a programming flow chart of a first control method for a belt breakage condition in the invention.

FIG. 3 is a programming flow chart of a second control method for a belt breakage condition in the present invention.

Fig. 4 is a programming flow chart of a third control method for a belt breakage condition in the invention.

Detailed Description

The invention is further described with reference to the following figures and specific examples.

As shown in fig. 1, the sequence of some apparatuses in the fully continuous hot strip rolling line according to the present invention is: the rolling mill comprises a rolling mill front roller way, a rolling mill and rolling mill rear roller way, a 1# guide plate, flying shears, a 1# hot metal equipment detector (short for thermal detection), a 1# underground coiler set, a 2# guide plate, a 2# hot metal equipment detector, a 2# underground coiler set, a scrap roller way and a scrap hopper, wherein 1# to 4# marked in figure 1 represent 4 auxiliary winding rollers of the coiler.

The winding drum and each wrapper roller are respectively driven by a hydraulic cylinder, and the equipment is controlled by 1 displacement sensor and 2 pressure sensors which are arranged in the equipment; the upper pinch roll and the lower pinch roll are respectively driven by 2 hydraulic cylinders, and the detection element consists of 2 displacement sensors, 2 rod cavity pressure sensors and 2 rodless cavity pressure sensors; the side guide plate is divided into a transmission side and an operation side, each hydraulic cylinder drives the side guide plate, and the side guide plate comprises 1 displacement sensor, 1 rod cavity pressure sensor and 1 rodless cavity pressure sensor; the position loop control and the pressure loop control are carried out on the servo valve by the displacement sensor and the pressure sensor.

Master speed ready state: the speed of the equipment on the coiling machine comprises a shearing rear roller way, and the speeds of a 1# pinch roll and a 2# pinch roll are respectively 1.5-4 times ahead of the speed of the strip steel, and the speed of the shearing front roller way is set to be consistent with the speed of the conventional coiling machine front roller way according to the maximum rotating speed of a motor; the sheared roller ways are all roller ways sheared to the horizontal direction of the waste hopper by flying shears; the speed of the auxiliary winding roll and the winding drum in the 1# recoiling machine is set to be consistent according to the advancing speed of the conventional lower recoiling machine, and the roller ways before shearing are all roller ways in the direction from flying shears to the rolling mill;

servo control system prepared state: the 1# guide plate and the 2# guide plate are respectively at an initial position, namely a position where the guide plates are completely opened; the lower pinch roll of the No. 1 is in a switching position, the lower pinch roll of the No. 2 is in a switching position, the upper pinch roll of the No. 1 and the upper pinch roll of the No. 2 are in an opening position, the opening position is that a roll gap is opened to more than 2 times of the thickness of strip steel, and the setting of the steel-coiling state positions of the two recoiling devices is consistent with that of the steel-coiling state positions of the conventional underground recoiling devices.

The invention provides an automatic control method of a coiler under the emergency situation of strip breakage of a fully continuous hot-rolling thin strip line, which is combined with a steel coiling process route of the fully continuous hot-rolling thin strip line, and a specific detection or monitoring component is installed at a corresponding position on the fully continuous hot-rolling thin strip line, wherein related electrical components and specific functional functions are shown in a table 1, and the one-key online automatic treatment of the strip breakage situation of the fully continuous hot-rolling thin strip line is realized by controlling the corresponding components, and the specific control method comprises the following steps of:

the fully continuous hot-rolling thin strip production line comprises 2 stationsA coiling machine: a1 # coiling machine and a 2# coiling machine define that the 2# coiling machine has a flying shear shearing operation relative to the 1# coiling machine besides a basic automatic coiling, according to a production sequence, a first strip steel which is not coiled before the coiling is finished and is discharged from any coiling machine is defined to be a first piece of steel, the strip steel which passes through a rolling machine can enter the 1# coiling machine for automatic coiling, and can also enter the 2# coiling machine for automatic coiling, according to a process requirement, after the strip steel head passes through the rolling machine, due to the fact that the thickness of the strip steel head is not uniform, a flying shear head must be selected, waste materials after the head cutting are conveyed into a waste hopper, a new strip steel head which is not fed into the coiling machine is the first piece of steel strip steel head, because the flying shear is short in distance from the 1# coiling machine and is much shorter than the flying shear distance from the 2# coiling machine, the switching time of a 1# lower roll cannot meet the time for pulling a certain distance between the conveyed waste materials and the first piece of strip, namely, the first steel cannot successfully enter the No. 1 coiler, so the first steel must first enter the No. 2 coiler to be coiled; when the 2# coiling machine is coiling steel, and the calculated steel coil weight exceeds the set coil weight H₂When the steel coil weight reaches the set coil weight H, the flying shear automatic shearing function is started, the head of the sheared new strip steel enters a 1# coiling machine for coiling, and when the steel coil weight in the 1# coiling machine reaches the set coil weight H₁When the strip steel is cut, the head of the cut new strip steel enters a 2# coiling machine for coiling, and so on, the two coiling machines switch the coiled steel, and the strip breakage is divided into three conditions according to the different strip steel breakage positions on the full-continuous hot-rolling thin strip production line:

strip breakage before the rolling mill passes through the rolling mill and does not enter a 2# coiler yet, the strip breakage in the condition is defined as a first strip breakage condition, and the condition is characterized in that: 1) when the waste material after flying shear shearing is shorter waste material hopper can adorn down: the flying shear is switched from automatic shearing to manual shearing, and after an operator carries out manual shearing operation according to the length of the waste, the rest of the operation is automatically controlled; 2) when the waste material is long and the waste material hopper cannot be loaded, the flying shear breaking function is selected, and after the head of the strip steel is normal, the flying shear breaking function is cancelled, and the rest of the control is automatic;

the strip steel before the rolling mill is not broken, after the strip steel is rolled by the rolling mill and waste materials are sheared by flying shears, a new strip steel head enters a 2# coiling machine for coiling, and after tension is established between a coiling block of the 2# coiling machine and a 2# pinch roll, the strip steel is broken in the steel coiling process of the 2# coiling machine, the broken strip under the condition is defined as a second condition, and the strip steel breakage under the condition is characterized in that: the strip steel enters a 2# coiling machine and is broken after being tensioned, after the tail of the strip steel in the 2# coiling machine passes through a 1# hot metal detector, the flying shear tracking selection function is cancelled, and the rest is automatically controlled; positioning the tail position of the strip steel in the 2# coiling machine, performing tracking calculation according to a 2# hot metal detector detection signal, and finally stopping the machine;

the strip steel before the rolling mill is not broken and is coiled by a 2# coiling machine, and when the weight of the steel coil in the 2# coiling machine reaches the set coil weight H₂When the steel strip is cut by the flying shear, the recoiling machine is automatically switched, the head of the cut new strip steel enters the 1# recoiling machine to be recoiled, and after the tension is established between the 1# recoiling machine winding drum and the 1# pinch roll, the strip steel is broken in the 1# recoiling machine coiling process, the broken strip under the condition is defined as a third broken strip condition, and the steel strip cutting device has the characteristics that: only the flying shear tracking selection function is cancelled, and the rest is automatically controlled.

Example 1: for the first belt breakage, the programming flow chart of the automatic control method is shown in fig. 2, and the automatic control method comprises the following steps:

step 1.1: after strip breakage, controlling the speed of a roller way after shearing to be increased to be 1.5-4 times of that of strip steel for preparation, wherein the roller way after shearing refers to all roller ways from the flying shear position to the waste hopper position in the horizontal direction of a full-continuous hot-rolling thin strip production line;

step 1.3: judging whether the length of the waste material is smaller than that of the waste material hopper, if so, manually controlling a flying shear to shear the waste material when the normal head of the first piece of steel moves to the flying shear position, and driving the head of the sheared first piece of steel strip to move to a 2# coiling machine for automatic coiling;

if the length of the waste is larger than or equal to that of the waste hopper, the flying shears are manually controlled to perform a breaking operation to cut the waste short, the breaking operation is cancelled when the normal head of the first piece of steel moves to the position of the flying shears, and the head of the first piece of steel after being cut moves to a 2# coiling machine under the driving of a roller way after being cut to automatically coil the steel;

step 1.4: the flying shear in the manual operation state is changed into the automatic operation state, the emergency treatment in the strip breakage state is completed, and the automatic coiling of the full-continuous hot rolling strip production line enters the normal automatic operation state.

Example 2: for the second belt breakage, the programming flow chart of the automatic control method is shown in fig. 3, and the automatic control method comprises the following steps:

step 2.5: firstly, when the No. 2 hot metal detector does not detect a signal, starting the position tracking of the tail of the strip steel which is being coiled in the No. 2 coiling machine, and secondly, controlling the No. 2 coiling machine to stop when the tracking distance of the tail of the strip steel which is being coiled in the No. 2 coiling machine is more than or equal to the distance from the No. 2 hot metal detector to the No. 2 wrapper roll;

step 2.6: and (3) a new strip steel head after strip breakage needs to enter a 1# coiling machine for coiling, a flying shear shearing signal is cancelled, after the 1# hot metal detector detects the signal again, a tracking starting signal of the new strip steel head position is established, emergency treatment under strip breakage is completed, and the 1# upper pinch roll, the 1# lower pinch roll, the 1# guide plate and the 1# coiling machine on the full-continuous hot rolling thin strip production line enter a normal automatic operation state.

Example 3: for the third belt breakage condition, the programming flow chart of the automatic control method is shown in fig. 4, and the automatic control method comprises the following steps:

step 3.3: when the No. 1 hot metal detector does not detect the signal, establishing a tracking starting signal of the tail part of the strip steel positioned in the No. 1 coiling machine, and when the distance from the tracking to the tail part of the strip steel positioned in the No. 1 coiling machine is greater than the distance from the No. 1 hot metal detector to the No. 1 wrapper roll, controlling the No. 1 coiling machine to stop;

step 3.4: after the tail of the strip steel in the 1# coiler passes through the 1# pinch roll, controlling the 1# lower pinch roll to be switched to a switching position, and controlling the 1# upper pinch roll to be positioned to a roll gap at the switching position, wherein the roll gap at the switching position is 2-4 times of the thickness of the strip steel;

In the above embodiments 1 to 3, the control system selects the siemens high-precision TDC and the siemens PLC-414CPU controller, the TDC is used to perform the press-down control on the devices driven by the hydraulic system, such as the winding drum, the side guide plate, the pinch roll, the wrapper roll, and the like, the PLC-414CPU is used to perform the master control, for the devices requiring the communication speed, the speed of the winding drum and the speed of the pinch roll are required in the TDC to calculate the tension and the like, the data communication adopts the DP network communication between the TDC and the PLC-414CPU, and meanwhile, the ethernet communication is also established, and the controller is mainly used for variables requiring low communication speed, such as the screen display state and the like.

TABLE 1 list of electrical components

Claims

1. An automatic control method of a coiling machine in an emergency situation of strip breakage of a fully continuous hot rolling thin strip line is characterized in that the strip breakage is divided into three situations according to the different strip breakage positions of strip steel on the fully continuous hot rolling thin strip production line: firstly, strip steel before a rolling mill passes through the rolling mill and is broken before entering a 2# coiling machine; secondly, the strip steel before the rolling mill is not broken, after the strip steel is rolled by the rolling mill and waste materials are sheared by flying shears, the head of the new strip steel enters a 2# coiling machine for coiling, and after tension is established between a coiling block of the 2# coiling machine and a 2# pinch roll, the strip steel is broken in the process of coiling the strip steel by the 2# coiling machine; thirdly, the strip steel before the rolling mill is not broken and is coiled by a 2# coiling machine, and when the weight of the steel coil in the 2# coiling machine reaches the set coil weight H₂The method comprises the following steps that firstly, flying shears automatically shear, a coiling machine automatically switches, a new head of a sheared strip steel enters a 1# coiling machine to be coiled, and after a coiling drum of the 1# coiling machine and a 1# pinch roll establish tension, the strip steel is broken in the coiling process of the 1# coiling machine, and the 2# coiling machine has flying shear shearing operation relative to the 1# coiling machine besides basic automatic coiling;

step 1.4: the flying shear in the manual operation state is changed into the automatic operation state, the emergency treatment in the strip breakage state is completed, and the steel coiling operation of the full-continuous hot rolling thin strip production line enters the normal automatic operation state;