CN214919229U

CN214919229U - Roller thermal crown control system

Info

Publication number: CN214919229U
Application number: CN202121321238.6U
Authority: CN
Inventors: 曹骅; 陈鹏
Original assignee: Granges AB
Current assignee: Granges AB
Priority date: 2021-06-15
Filing date: 2021-06-15
Publication date: 2021-11-30
Anticipated expiration: 2031-06-15

Abstract

The utility model provides a hot convexity control system of roll, spray the roof beam including temperature measurement unit, PLC the control unit, cooling regulating element and roll cooling, the temperature measurement unit include a plurality of axial direction interval arrangements along the roll and with the outer surface contact of roll or the temperature thermocouple of separation, roll cooling sprays the roof beam be provided with each a plurality of injection posts that the temperature thermocouple position corresponds, the PLC the control unit is used for receiving the multichannel temperature signal of temperature measurement unit to send control command extremely the cooling regulating element, the cooling regulating element controls each respectively spray the jet volume of post. The utility model discloses a hot convexity control system of roll has that measurement response is fast, the stable advantage of temperature output, need not measuring personnel manual operation, and the measuring position is stable to can self-define the measurement opportunity, provide required data in real time for aspects such as production, technology and maintenance.

Description

Roller thermal crown control system

Technical Field

The utility model relates to a rolling field of metal, more specifically relates to a hot convexity control system of roll.

Background

In the production process of rolling the strip rolled piece, the temperature of the high-temperature strip rolled piece, plastic deformation heat generated by the strip rolled piece in a deformation area, friction heat generated by relative sliding of the strip rolled piece and a roller and the like form heat input relative to the roller, so that the temperature of the roller is increased; meanwhile, the cooling of the cooling liquid to the roller, the heat dissipation of the roller to the environment and the like continuously take away heat from the roller, and heat output relative to the roller is formed. The combined effect of the heat input and the heat output is to cause the roller to thermally expand, thereby forming a hot roll shape of the roller, which is the contour shape of the roller body surface of the roller after the roller is thermally expanded. The magnitude of the hot roll profile is usually expressed in terms of thermal crown, which is defined as the difference in thermal expansion between representative points at the middle and end of the roll.

The transverse thickness difference of the end face of the strip rolled piece (namely, the convexity of the strip rolled piece) is influenced by the rolling pressure, the hot convexity of the roller, the distribution of the contact pressure between the rollers and the like, the actually rolled end face sometimes takes irregular shapes such as bulging, wedge, concave and the like, and the irregular shapes are mainly generated by uneven roller gaps, so that the control on the hot convexity of the roller and further the roller gaps becomes necessary.

However, due to the high temperature environment within the mill, it is difficult to measure the profile/thermal expansion of the rolls (i.e., the roll crown) during rolling. Therefore, the prior design uses numerical calculation methods (including finite difference method and finite element method) to simulate the temperature field and the thermal crown of the roll, so as to adjust the cooling to improve the thermal crown of the roll. Although these numerical calculation methods do not require direct measurement, the accuracy of the results is often disturbed by other factors (e.g., heat content of the strip before rolling, heat generated by deformation work and friction at the contact arc, heat conducted to the roll through the contact arc, heat loss at the roll surface due to cooling, etc.) and cannot truly reflect the temperature field and thermal crown of the roll, which ultimately leads to control errors and rejection of the strip rolled piece.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a solve the problem that exists among the above-mentioned prior art just, provide a hot convexity control system of roll, this control system is used for accurate control roll temperature, and then the hot convexity of control roll is in order to improve the convexity of slab band rolled piece.

In order to realize the above object, the utility model provides a hot convexity control system of roll, spray the roof beam including temperature measurement unit, PLC the control unit, cooling regulating element and roll cooling, the temperature measurement unit include a plurality of axial direction interval arrangements along the roll and with the outer surface contact of roll or the temperature thermocouple of separation, roll cooling sprays the roof beam and is provided with each a plurality of injection posts that the temperature thermocouple position corresponds, the PLC the control unit is used for receiving the multichannel temperature signal of temperature measurement unit to send control command extremely the cooling regulating element, the cooling regulating element controls each respectively spray the jet volume of post.

In accordance with the above-described concepts, the present invention may further include any one or more of the following alternatives.

In some alternatives, each of the temperature thermocouples is a double-pin type K-type thermocouple and is adapted to be driven by a cylinder to contact or separate from the outer surface of the roll.

In some optional forms, a temperature control instrument and an analog input module are connected between the temperature measuring unit and the PLC control unit, the temperature control instrument is adapted to convert a plurality of paths of temperature signals into analog signals and output the analog signals to the analog input module, and the PLC control unit receives a plurality of paths of digital signals output by the analog input module.

In some optional forms, a digital quantity output module is connected between the cooling regulation unit and the roller cooling spray beam, and the digital quantity output module generates a plurality of paths of discrete signals to respectively control the spray quantity of each spray column on the roller cooling spray beam.

In some alternatives, the PLC control unit is connected to a data acquisition unit to record the temperature signal.

In some alternatives, each said spray post is provided with a nozzle.

The utility model discloses a hot convexity control system of roll directly measures hot rolling roll surface temperature and inputs temperature signal into PLC the control unit through the temperature measurement unit, has the advantage that measurement response is fast, temperature output is stable, PLC the control unit is according to the injection volume of the injection post that each injection point position of temperature signal control roll cooling injection roof beam that records to accurate control roll temperature; the temperature measuring unit is driven by the air cylinder, and manual operation of a measuring person is not needed, so that the operating person can be far away from a dangerous working environment, and the measuring position is stable; the measurement time can be customized, and required data can be provided for the aspects of production, process, maintenance and the like in real time.

Drawings

The disclosure of the present invention is explained with reference to the drawings. It is to be understood that the drawings are designed solely for the purposes of illustration and not as a definition of the limits of the invention. In the drawings, like reference characters designate like or similar parts throughout the several views unless otherwise specified, and wherein:

FIG. 1 shows a partial schematic view of a roll thermal crown control system inside a rolling mill according to an embodiment of the present invention;

FIG. 2 is a top view of the temperature measuring units arranged at intervals along the axial direction of the roll;

FIG. 3 shows a schematic front view of a roll cooling spray beam;

fig. 4 shows a block diagram of a roll thermal crown control system according to an embodiment of the present invention.

Skilled artisans will appreciate that elements in the figures are illustrated for simplicity and clarity and have not necessarily been drawn to scale. For example, the dimensions of some of the elements in the figures may be exaggerated relative to other elements to help improve understanding of embodiments of the present disclosure.

Detailed Description

The practice and use of the embodiments are discussed in detail below. It should be understood, however, that the specific embodiments discussed are merely illustrative of specific ways to make and use the invention, and do not limit the scope of the invention. The terms of orientation of up, down, left, right, front, rear, top, bottom, and the like referred to or as may be referred to in this specification are defined relative to the configuration shown in the drawings, and are relative terms, and thus may be changed according to the position and the use state thereof. Therefore, these and other directional terms should not be construed as limiting terms.

In an exemplary embodiment, as shown in fig. 1, the roll thermal crown control system includes a temperature measuring unit 1 and a roll cooling spray beam 2 inside the rolling mill for controlling the thermal crown of the roll 3. Only one of the rolls 3 of the rolling mill is shown in the drawing, and in practice, the rolling mill is divided into two rolls, four rolls, six rolls, eight rolls, twelve rolls, eighteen rolls, etc. according to the number of rolls, and therefore, the temperature measuring unit 1 and the roll cooling spray beam 2 corresponding to the number of rolls can be selected.

Specifically, as shown in fig. 2, the temperature measuring unit 1 includes a plurality of temperature measuring thermocouples 11 arranged at intervals in the axial direction of the roll 3 and contacting or separating from the outer surface of the roll 3, wherein optionally, the temperature measuring unit 1 includes 16 temperature measuring thermocouples 11 arranged at intervals and uniformly in the axial direction of the roll 3, each temperature measuring thermocouple 11 preferably employs a double-needle type K-type thermocouple, and only when both probes of the double-needle type K-type thermocouple contact the outer surface of the roll 3, the temperature measuring thermocouples 11 form a closed loop due to the conduction function of the roll 3, thereby generating a temperature signal. Referring to fig. 1, the temperature measuring unit 1 is disposed inside the rolling mill and driven by the cylinder 12 to automatically control the temperature measuring unit 1 to contact with or separate from the outer surface of the roll 3, so that the operator can be away from a dangerous working environment without manual operation. If an operator holds the thermocouple to enter the rolling mill for internal measurement, the risk of slipping is caused due to more oil stains on site, and the measurement position (including the angle) and the force of the hand-held thermocouple are uncertain, so that a larger measurement error is caused. In addition, arranging several (for example, 16) temperature thermocouples 11 on a telescopic frame driven by the same cylinder enables the temperatures of 16 points of the roll 3 to be measured simultaneously, more accurately reflecting the temperature distribution of the roll 3 in the axial direction. In other embodiments, the temperature measuring unit 1 may be driven by a motor to contact or separate from the roll.

As shown in fig. 3, the roll cooling spray beam 2 is provided with a plurality of spray posts 21 corresponding to the positions of the respective temperature thermocouples 11, and for example, the roll cooling spray beam 2 is provided with 16 spray posts 21. The plurality of spray columns 21 are also uniformly and alternately arranged along the axial direction of the roller 3 to adjust the spray amount of the spray column 21 at the corresponding position according to the temperature signal of each temperature measuring position, wherein the spray columns 21 spray cooling liquid or cooling gas optionally.

Referring to fig. 4, the roll thermal crown control system further includes a PLC control unit 5 and a cooling regulation unit 6, wherein the PLC control unit 5 is configured to receive multiple temperature signals from the temperature measurement unit 1 and send control commands to the cooling regulation unit 6, and the cooling regulation unit 6 controls the injection amount of each injection column 21 on the roll cooling injection beam 2.

In an alternative embodiment, as shown in fig. 3, each spray column 21 is provided with a nozzle 211, for example each spray column 21 is provided with two nozzles 211 arranged one above the other. Alternatively, the spray pattern and spray angle of the nozzles can be changed or adjusted on the same spray column to achieve a close arrangement of the spray ranges of the respective nozzles without interfering with each other.

Preferably, the PLC control unit 5 combines software and hardware such as control programming, communication, data management, human-computer interface, parameter configuration, etc. into a system, and obtains a real-time temperature curve through the obtained temperature signals of the roll at a plurality of positions and combining with an algorithm inside the program to simulate, in an optional embodiment, a continuous temperature curve of the roll in the axial direction by measuring temperature values at 16 positions of the roll in the axial direction. The PLC control unit 5 can store a preset temperature curve, the preset temperature curve corresponds to the target thermal crown of the roller, and when the measured and simulated temperature curve has deviation from the preset temperature curve, the PLC control unit controls the injection amount of the injection column corresponding to the corresponding deviation position so as to adjust the thermal crown of the roller to achieve the preset target. In an alternative embodiment, the PLC control unit 5 is an AC800PEC controller that contains a powerful CPU and a large field programmable gate array, and therefore has a high operating and sampling speed.

In order to ensure the stability of data input and output, as shown in fig. 4, a temperature control instrument 7 and an analog input module 8 are connected between the temperature measuring unit 1 and the PLC control unit 5. Under the condition that the temperature measuring thermocouples 11 adopted by the temperature measuring unit 1 are numerous, the temperature control instrument 7 is suitable for converting the multiple paths of temperature signals measured by the temperature measuring unit 1 into analog signals and outputting the analog signals to the analog input module 8, and the analog input module 8 outputs multiple paths of digital signals to the PLC control unit 5. In particular, the temperature control instrument 7 may employ an SR93 temperature control instrument, which has an excellent control effect, and can improve the conditioning quality and output a stable analog transmission measurement value. The analog input module 8 collects analog signals of a remote site to the PLC control unit 5, and a plurality of analog input modules 8 can be combined to transmit more paths of analog signals, such as 16 paths of analog signals of the temperature measuring unit 1 shown in FIG. 2.

The cooling adjustment unit 6 receives a control instruction of the PLC control unit 5, wherein the cooling adjustment unit 6 is composed of an independent PLC controller, an input/output module, and the like, and can operate a complex model algorithm, thereby realizing a faster response and a stable output, and reducing an operation load of the PLC control unit 5. For a plurality of injection positions, optionally, a digital output module 9 is connected between the cooling adjustment unit 6 and the roll cooling injection beam 2, and the digital output module 9 has a plurality of output interfaces capable of generating a plurality of discrete signals corresponding to the number of injection columns 21 to control the injection amount of each injection column 21 on the roll cooling injection beam 2 respectively.

In an alternative embodiment, the PLC control unit 5 is connected to a data acquisition unit 10 to record the temperature signal of each measurement, which is convenient for the technician to analyze and improve the roll thermal crown control system.

The timing of the measurements can be adjusted at any time while operating the roll thermal crown control system, for example, by measuring the roll temperature before a different rolling pass to service adjusting the temperature profile for the next rolling pass. The end surface shape and the wedge degree of the strip rolled piece are controlled by controlling the thermal convexity of the roller.

Although some embodiments have been described herein by way of example, various modifications may be made to these embodiments without departing from the spirit of the invention, and all such modifications are intended to be included within the scope of the invention as defined in the following claims.

The particular embodiments disclosed herein are illustrative only, as the invention may be modified in nature and equivalents thereof, apparent to those skilled in the art from the teachings herein, and, thus, the specific embodiments of the invention disclosed above are illustrative only, and are not to be considered in a limiting sense as to the details of construction or design herein disclosed unless otherwise specified in the claims. Accordingly, the particular illustrative embodiments disclosed above are susceptible to various substitutions, combinations or modifications, all of which are within the scope of the disclosure. The techniques illustratively disclosed herein suitably may be practiced in the absence of any element that is not specifically disclosed herein or in the absence of any optional component disclosed herein.

Claims

1. The roll thermal crown control system is characterized by comprising a temperature measurement unit, a PLC (programmable logic controller) control unit, a cooling regulation unit and a roll cooling injection beam, wherein the temperature measurement unit comprises a plurality of temperature measurement thermocouples which are arranged at intervals along the axial direction of a roll and are in contact with or separated from the outer surface of the roll, the roll cooling injection beam is provided with a plurality of injection columns corresponding to the positions of the temperature measurement thermocouples, the PLC control unit is used for receiving a plurality of paths of temperature signals of the temperature measurement unit and sending a control command to the cooling regulation unit, and the cooling regulation unit controls the injection amount of each injection column respectively.

2. The roll thermal crown control system according to claim 1, characterized in that each of the temperature thermocouples is a double-pin type K-type thermocouple and is adapted to be driven by a cylinder to contact or separate from the outer surface of the roll.

3. The roll thermal crown control system according to claim 1, wherein a temperature control instrument and an analog input module are connected between the temperature measurement unit and the PLC control unit, the temperature control instrument is adapted to convert a plurality of paths of the temperature signals into analog signals and output the analog signals to the analog input module, and the PLC control unit receives a plurality of paths of digital signals output by the analog input module.

4. The roll thermal crown control system according to claim 1, characterized in that a digital output module is connected between the cooling adjustment unit and the roll cooling spray beam, and the digital output module generates a plurality of discrete signals to control the spray amount of each spray post on the roll cooling spray beam respectively.

5. The roll thermal crown control system according to any one of claims 1 to 4, characterized in that the PLC control unit is connected with a data acquisition unit to record the temperature signal.

6. A roll thermal crown control system according to any one of claims 1 to 4, characterized in that each of the spray columns is provided with a nozzle.