CN117019880A - Strip periodic transmission side-to-side curling control method - Google Patents

Abstract

The invention relates to a strip periodic transmission side-to-side curling control method which comprises a DSS detector, a controller, a position sensor, a servo valve and a hydraulic cylinder, wherein the DSS detector, the servo valve and the hydraulic cylinder are arranged on the transmission side of a coiling machine, the DSS emitter and the position sensor of the DSS detector are connected with the controller through ports, the controller is connected with the servo valve through ports, the servo valve is connected with the hydraulic cylinder, the position sensor is arranged on a base of the coiling machine, and the hydraulic cylinder is used for driving the coiling machine to axially move. The invention has the advantages that: when the deviation correcting value reaches the set deviation value, a set voltage value is added to the control end of the controller, the valve plate opening of the servo valve is controlled by the controller, the hydraulic oil cylinder follows the set voltage value given by the controller to ensure that the axial displacement of the coiling machine is synchronous, so that the coiling machine can continuously follow the position change of the monitored edge of the strip, the coiled edge of the strip steel on the transmission side is tidy, and the occurrence of a steel coil tower is avoided.

Description

A method for controlling side-to-side curling of strips with periodic transmission

Technical field

The invention relates to the field of strip production equipment, and in particular to a method for controlling side-to-side curling of strips through periodic transmission.

Background technique

At present, in the cold-rolled silicon steel production lines of metallurgical enterprises, in order to keep the strip curling edges neat, the coiler correction (EPC) is usually used to track the edge position of the strip, and the coiler is controlled to align one side of the strip to the edge of the strip for curling, keeping the strip. Neat. Due to the plate itself (such as sickle bending) or external reasons (such as guide roller wear), the strip steel will undergo axial displacement during the traveling process. If the deviation is not used at the curling point, the strip steel will not be curled neatly, so the curling will Irregular steel coils cannot be produced in subsequent processes. After the coil reaches a certain weight, the coil core will become loose due to the loosening of the coil core. During the correction process of the coiler, if edges appear on the edge of the strip, Waves or vortex edges will also cause the edge of the strip to be unevenly stressed or slip during the curling process. If the steel coil gradually becomes larger, the tension on the periphery of the steel coil will squeeze out the inner ring of the steel coil core, forming The shape of a pagoda or a rice bowl is commonly known as a tower shape. It requires operators to perform frequent rolling operations to make the unit operate normally, which increases the probability of accidents and production costs.

Contents of the invention

The object of the present invention is to provide a method for controlling the side-to-side curling of strips through periodic transmission, so that the coiler can continuously follow the position changes of the monitored edges of the strips and avoid the appearance of steel coil towers.

In order to achieve the above objects, the present invention is implemented through the following technical solutions:

A strip periodic transmission side-to-side curling control method, including a unit, which is provided with a guide roller and a coiler, and also includes a DSS detector, a controller, a position sensor, a servo valve, a hydraulic cylinder, and a coiler. The transmission side is equipped with a DSS detector, servo valve, and hydraulic cylinder. The DSS detector includes a DSS transmitter and a DSS receiver. The DSS transmitter and position sensor are connected to the controller through the port. The controller is connected to the servo valve through the port. The servo valve Connected to the hydraulic cylinder, the position sensor is set on the base of the coiler to detect the lateral displacement of the coiler. The hydraulic cylinder is used to drive the axial movement of the coiler. The control method specifically includes the following steps:

S1. The controller obtains the correction value. The deviation value when the strip passes through the DSS detector this time is subtracted from the deviation value when the strip passed through the DSS detector before. The resulting value is the correction value. The formula for the deviation value is as follows:

Correction value = reference value – target value ①

In formula ①, the target value is when the receiver receives the optical signal that passes through the transmitter and is partially emitted when it is blocked by the strip steel. The reference value is when the receiver receives the light signal that passes through the transmitter and is not blocked by the strip steel. All the light signals emitted;

S2. When the correction value reaches the set offset value, the set voltage value is added to the control end of the controller, and the valve plate opening of the servo valve is controlled by the controller, so that the hydraulic cylinder follows the set voltage given by the controller. The value ensures that the axial displacement of the coiler is synchronized.

In step S2, the set voltage value is obtained through the number of rotations of the coiler. The specific content is as follows:

The initial position of the coiler is the zeroth revolution. Every time it rotates, the forward voltage setting value is added to the controller;

When the coiler reaches the set number of revolutions, each time it rotates, the forward voltage setting value is reduced for the controller;

When the coiler reaches the set number of revolutions two, the zero voltage setting value is given to the controller. After that, every time it rotates, the negative voltage setting value is reduced to the controller;

When the coiler reaches the set number of turns three, each time it rotates, the negative voltage setting value is added to the controller;

When the coiler reaches the set number of turns four, it is a cycle, and the count is reset at this time.

The number of rotations of the coiler is obtained by an encoder located on the transmission side of the coiler.

The DSS detector is used to detect the edge position of the strip on the guide roller. The DSS detector is a non-contact photoelectric sensor. The DSS transmitter is set on the base of the guide roller, located at the front end of the guide roller and parallel to the guide roller. The DSS receiver The receiver is set on a bracket, which is connected to the base of the guide roller, and the DSS receiver is located directly above the DSS transmitter.

A groove is provided on the surface of the unit, and the DSS transmitter is fixed in the groove.

Compared with the prior art, the beneficial effects of the present invention are:

When the correction value reaches the set offset value, the set voltage value is added to the control end of the controller, and the valve plate opening of the servo valve is controlled by the controller. The hydraulic cylinder follows the set voltage value given by the controller to ensure that the volume The axial displacement of the unwinding machine is synchronized, so that the coiling machine can continuously follow the position change of the monitored edge of the strip, so that the strip can be curled neatly on the transmission side, avoiding the appearance of a steel coil tower shape. The modification structure is simple, low cost, and easy to accomplish.

Description of the drawings

Figure 1 is a schematic diagram of the side-to-side curling structure of the strip's periodic transmission.

Figure 2 is a schematic diagram of the strip curl edge shape.

Figure 3 is a schematic diagram of the external wiring of the controller.

In the picture: 1-coiler 2-guide roller 3-controller 4-detector 5-servo valve 6-hydraulic cylinder 7-position sensor.

Detailed ways

The present invention will be described in detail below with reference to the accompanying drawings, but it should be noted that the implementation of the present invention is not limited to the following embodiments.

The following examples are implemented on the premise of the technical solution of the present invention and provide detailed implementation modes and specific operating processes. However, the protection scope of the present invention is not limited to the following examples. The methods used in the following examples are conventional methods unless otherwise specified.

[Example 1]

The coiler correction (EPC) is usually used for strip curl correction in cold-rolled silicon steel production lines, that is, the drive side is curled edge-to-edge. Due to the plate itself (such as sickle bending) or external reasons (such as guide roller wear) or the edge of the strip appears When there are waves or vortices, and the DSS detector detects a deviation in the strip detection position, the EPC will control the coiler to move in proportion to the direction of the strip deviation. If there are waves or vortices on the edge of the strip, it will As a result, the edge of the steel coil is unevenly stressed or slips during the curling process. When the diameter of the steel coil gradually increases, the tension on the periphery of the steel coil will squeeze out the inner ring of the steel coil core. After the transformation, the original equipment will On the basis of this, the position sensor 7, the servo valve 5, and the hydraulic cylinder 6 are added to break the neat correction method of the steel coil on the transmission side and realize the neat curling edge of the strip on the transmission side. A strip periodic drive side-to-side curling control method, as shown in Figure 1, including a unit, DSS digital detector 4, correction controller 3-H6600, position sensor 7, servo valve 5, hydraulic cylinder 6, set on the unit There is a guide roller 2 and a coiler 1. The transmission side of the coiler 1 is equipped with a DSS digital detector 4, a servo valve 5, and a hydraulic cylinder 6. The deviation correction controller 3-H6600 is connected to the servo valve 5 through the port. The servo valve 5 is connected to the hydraulic cylinder 6, the position sensor 7 is set on the base of the coiler 1, the hydraulic cylinder 6 is used to drive the coiler 1 to move axially, and the DSS digital detector 4 is used to detect the transmission side edge of the strip. By detecting the position on the guide roller 2, the strip can move within the detection range of the DSS digital detector 4; the DSS digital detector 4 consists of a transmitter, a wide-angle receiver, and a signal conversion control panel. It uses a DSS digital Detector 4 detects the position change of the strip edge, and converts the position of the strip edge detected by the DSS digital detector 4 into a proportional voltage signal through the signal conversion control panel and outputs it to the correction controller 3-H6600 ; DSS digital detector 4 is a non-contact photoelectric sensor, and the DSS transmitter is set on the base of guide roller 2, located at the front end of guide roller 2, parallel to guide roller 2, and set on the transmission side of the strip steel roller table There is a bracket, the wide-angle receiver is set on the bracket, and the bracket is connected to the base of the guide roller 2. The wide-angle receiver is located directly above the DSS transmitter; the position sensor 7 is used to detect the lateral displacement of the coiler and adjust the coiler The lateral displacement signal is converted into a voltage signal proportional to it and output to the control amplifier H6600; a groove is set on the surface of the unit, and the DSS transmitter is fixed in the groove.

The control method is: specifically including the following steps:

S1. The correction controller 3-H6600 obtains the correction value. The deviation value when the strip passes through the DSS digital detector 4 this time is subtracted from the deviation value when the strip passed through the DSS digital detector 4 last time. The resulting value is Correction value, the formula of the deviation value is as follows:

Correction value = reference value – target value ①

In formula ①, the target value is when the receiver receives the optical signal that passes through the transmitter and is partially emitted when it is blocked by the strip steel. The reference value is when the receiver receives the light signal that passes through the transmitter and is not blocked by the strip steel. All the light signals emitted;

S2. When the correction value reaches the set offset value, increase the set voltage value to the control end of the correction controller 3-H6600. The correction controller 3-H6600 controls the valve plate opening of the servo valve 5 so that the hydraulic cylinder 6 follows The set voltage value given by the correction controller 3-H6600 ensures the synchronization of the axial displacement of the coiler 1;

The set voltage value is obtained through the number of rotations of the coiler 1. The number of rotations of the coiler 1 is obtained by the encoder installed on the transmission side of the coiler 1. The specific content is as follows:

The initial position of coiler 1 is the zeroth revolution. Every time it rotates, the forward voltage setting value is added to the correction controller 3-H6600;

When the coiler 1 reaches the set number of revolutions, each time it rotates, the forward voltage setting value of the correction controller 3-H6600 is reduced;

When the coiler 1 reaches the set number of turns two, it will give the zero voltage setting value to the correction controller 3-H6600. After that, every time it rotates, it will reduce the negative voltage setting value to the correction controller 3-H6600;

When the coiler 1 reaches the set number of turns three, each time it rotates, the negative voltage setting value is added to the correction controller 3-H6600;

When the coiler 1 reaches the set number of turns four, it is a cycle, and the count is reset at this time.

work process:

DSS digital detector 4 detects that the strip is offset by 5mm toward the transmission side at guide roller 2, then the output voltage increases by 0.5V from the zero point (the strip is at guide roller 2, and the position during calibration is zero). Since each roll When the strip is inserted into the coiler, there is no guarantee that the edge position of the strip will be exactly the same. Then, when the strip enters the coil and the coiler runs, a certain tension will be established before coiling. When the tension is successfully established, the production system will give the coiler The EPC's correction controller 3-H6600 sends a signal. At this time, the correction controller 3-H6600 will define the position of the current strip on the DSS detector as the zero point position of the current steel coil, and set the position sensor 7 at the coiler 1 The output voltage signal is 0V, then the deviation correction controller 3-H6600 calculates through 0.5V and 0V, and it is concluded that the strip is offset 5mm to the transmission side, and the strip moves 1mm to the transmission side, corresponding to the signal voltage increasing by 0.1V, then the deviation control The controller 3-H6600 outputs the corresponding electrical signal to the servo valve 5. Push the hydraulic cylinder 6 of the base of the coiler 1 to move 5mm toward the transmission side. According to this reciprocating action, PID closed-loop control is performed, so that the coiler can continuously follow the position changes of the monitored edge of the strip, thereby obtaining a curled steel coil. The steel is neatly edged on the drive side.

[Example 2]

In this embodiment, a strip periodic drive side-to-edge curling control method is the same as Embodiment 1. On the basis of it, a PLC analog output module is added, and the analog voltage is loaded to the correction controller 3-H6600 through the analog output module. signal, so that the operating length of the hydraulic cylinder 6 is linear and proportional.

See Figure 3. The analog output module 6ES7322-5HF00-0AB0 is added to the ET200 station of Siemens PLC. The output DC voltage range is: +10V to ~10V, which is given to the bias signal control terminal of the EPC correction system correction controller 3-H6600. D8 and D11, observe the logical AND of the EPC correction system correction controller 3-H6600 to drive the action of hydraulic cylinder 6 after receiving the ±10V signal and the stroke of the hydraulic cylinder; through the accumulation of the initial diameter of the strip curling 508mm and the strip thickness, the strip roll The diameter of the strip increases by 2 times the thickness of the strip every time the machine rotates. The number of strip turns can be calculated by the diameter of the rolled strip. The details are as follows:

Current diameter of steel coil = (initial coil diameter 508mm + strip thickness * 2) Formula ②

Number of crimping turns = (current diameter of steel coil - initial crimping diameter 508mm)/2, formula ③

The number of rotations of the curling machine is measured through the encoder to define the corresponding DC voltage signal output. The first circle outputs 0V and the second circle outputs 1V.

Through experiments, it is determined that 40 turns of curling is a conversion cycle. At the 0th turn, the analog output module outputs a positive incremental voltage of 1V for each rotation to the bias signal control terminal of the correction controller 3-H6600; at the 10th turn The analog output module outputs a forward voltage that decreases by 1V for each rotation to the bias signal control terminal of the correction controller 3-H6600. When reaching 20 revolutions, the analog output module supplies the bias signal control terminal of the correction controller 3-H6600. The output voltage is 0, and every time the coiler rotates, the bias signal control terminal of the correction controller 3-H6600 starts to output a negative voltage, which decreases by 1V for every rotation, and starts to increase by 1V for every rotation when it reaches 30 rotations; When 40 circles are reached, it is a cycle and the counter is reset. Table 1 is a comparison table between the experimentally measured external loading voltage and the displacement of the hydraulic cylinder 6.

Table 1:

See Figure 2. The peak voltage is set for curling every 10 turns. By repeating this periodically, the rolled steel coil is periodic and controllable with staggered edge curling.

In the present invention, when the correction value reaches the set offset value, the set voltage value is added to the control end of the controller, the valve plate opening of the servo valve is controlled by the controller, and the hydraulic cylinder follows the settings given by the controller The voltage value ensures that the axial displacement of the coiler is synchronized, so that the coiler can continuously follow the position change of the monitored edge of the strip, achieving neat curling edges of the strip on the transmission side, avoiding the appearance of a steel coil tower shape, and the modification structure is simple. Low cost and easy to implement.

Claims (5)

1. A strip periodic transmission side-to-side curling control method, including a unit equipped with a guide roller and a coiler, which is characterized in that it also includes a DSS detector, a controller, a position sensor, a servo valve, a hydraulic pressure Oil cylinder, the drive side of the coiler is equipped with a DSS detector, servo valve, and hydraulic cylinder. The DSS detector includes a DSS transmitter and a DSS receiver. The DSS transmitter and position sensor are connected to the controller through the port. The controller is connected to the controller through the port. The servo valve is connected, the servo valve is connected to the hydraulic cylinder, the position sensor is set on the base of the coiler and is used to detect the lateral displacement of the coiler, and the hydraulic cylinder is used to drive the axial movement of the coiler. The described control method Specifically, it includes the following steps: S1. The controller obtains the correction value. The deviation value when the strip passes through the DSS detector this time is subtracted from the deviation value when the strip passed through the DSS detector before. The resulting value is the correction value. The formula for the deviation value is as follows: Correction value = reference value – target value ① In formula ①, the target value is when the receiver receives the optical signal that passes through the transmitter and is partially emitted when it is blocked by the strip steel. The reference value is when the receiver receives the light signal that passes through the transmitter and is not blocked by the strip steel. All the light signals emitted; S2. When the correction value reaches the set offset value, the set voltage value is added to the control end of the controller, and the valve plate opening of the servo valve is controlled by the controller, so that the hydraulic cylinder follows the set voltage given by the controller. The value ensures that the axial displacement of the coiler is synchronized. 2. A strip periodic transmission side-to-side curling control method according to claim 1, characterized in that, in step S2, the set voltage value is obtained by the number of rotations of the coiler, and the specific content is as follows: The initial position of the coiler is the zeroth revolution. Every time it rotates, the forward voltage setting value is added to the controller; When the coiler reaches the set number of revolutions, each time it rotates, the forward voltage setting value is reduced for the controller; When the coiler reaches the set number of revolutions two, the zero voltage setting value is given to the controller. After that, every time it rotates, the negative voltage setting value is reduced to the controller; When the coiler reaches the set number of turns three, each time it rotates, the negative voltage setting value is added to the controller; When the coiler reaches the set number of turns four, it is a cycle, and the count is reset at this time. 3. A method for controlling side-to-side curling of strips with periodic transmission according to claim 2, characterized in that the number of rotations of the coiler is obtained by an encoder provided on the transmission side of the coiler. 4. A method for controlling side-to-side curling of strips in periodic transmission according to claim 1, characterized in that the DSS detector is used to detect the edge position of the strip at the guide roller, and the DSS detector is non-contact. Type photoelectric sensor, the DSS transmitter is set on the base of the guide roller, located at the front end of the guide roller and parallel to the guide roller, the DSS receiver is set on the bracket, the bracket is connected to the base of the guide roller, the DSS receiver is located on the DSS directly above the transmitter. 5. A method for controlling side-to-side curling of periodic drive strips according to claim 4, characterized in that a groove is provided on the surface of the unit, and the DSS transmitter is fixed in the groove.