阅读说明：本技术 一种轧辊磨损自愈装置及其控制方法 (Roller abrasion self-healing device and control method thereof ) 是由 许志强 海杨 杨庭松 陈启发 白宇航 张驰 于 2021-07-20 设计创作，主要内容包括：本发明涉及一种轧辊磨损自愈装置及其控制方法,所述装置包括工作辊、导热硅脂、TEC电子温控片、水冷器、温度传感器导线、直流电源导线和温度传感器；所述温度传感器设置在TEC电子温控片的冷端和热端；TEC电子温控片热端与工作辊之间通过导热硅脂接触；TEC电子温控片冷端通过导热硅脂与水冷器接触固定；水冷器直接水泵和循环水槽；TEC电子温控片连接直流电源。将工作辊进行分区处理,每个区段进行独立调整控制；根据现有辊形磨损预报技术实时对辊形监测,通过信号采集系统,温度控制系统等在线对TEC电子温控片的温度进行调控,进而对磨损辊形进行动态在线补偿。本发明板形调控能力强、灵活多变且易于控制,可用于轧辊磨损辊形的补偿以延长换辊生命周期。(The invention relates to a roller abrasion self-healing device and a control method thereof, wherein the device comprises a working roller, heat-conducting silicone grease, a TEC electronic temperature control sheet, a water cooler, a temperature sensor lead, a direct-current power supply lead and a temperature sensor; the temperature sensors are arranged at the cold end and the hot end of the TEC electronic temperature control sheet; the hot end of the TEC electronic temperature control sheet is contacted with the working roll through heat-conducting silicone grease; the cold end of the TEC electronic temperature control sheet is fixedly contacted with a water cooler through heat-conducting silicone grease; a water cooler is connected with a direct water pump and a circulating water tank; the TEC electronic temperature control chip is connected with a direct current power supply. The working roll is processed in a partition mode, and each section is independently adjusted and controlled; the roll shape is monitored in real time according to the existing roll shape wear prediction technology, and the temperature of the TEC electronic temperature control sheet is regulated and controlled on line through a signal acquisition system, a temperature control system and the like, so that the worn roll shape is dynamically compensated on line. The method has strong plate shape regulation and control capability, is flexible and changeable and easy to control, and can be used for compensating the worn roll shape of the roll so as to prolong the life cycle of roll replacement.)

1. The utility model provides a roll wearing and tearing self-healing device which characterized in that: the device comprises a working roll, heat-conducting silicone grease, a TEC electronic temperature control sheet, a water cooler, a temperature sensor lead and a direct-current power supply lead; the temperature sensors are respectively arranged at the hot end and the cold end of the TEC electronic temperature control sheet and are used for directly measuring the temperatures of the hot end and the cold end; the TEC electronic temperature control plates are arranged in n number at equal intervals along the axial direction of the working roll, are arranged in m rows at equal intervals along the circumferential direction of the working roll and are axially parallel to the working roll; one end face of the TEC electronic temperature control sheet is contacted with the inner wall of the working roller through heat conduction silicone grease; the other end face of the TEC electronic temperature control sheet is in contact with and fixed with a water cooler through heat conduction silicone grease, the water coolers are arranged in m rows at equal intervals along the circumferential direction of the working roller, and each water cooler can bear a plurality of axial TEC electronic temperature control sheets; the TEC electronic temperature control plates are arranged in this way and are loaded through m water coolers; the water cooler is externally connected to the water pump and the circulating water tank; the TEC electronic temperature control chip is externally connected to a direct current power supply through a direct current power supply lead; the temperature sensor is externally connected to the data acquisition system through a temperature sensor wire, and the data acquisition system transmits the collected temperature data to the temperature control system.

2. The self-healing device for roll wear according to claim 1, characterized in that: the TEC electronic temperature control wafer can be used as an internal heat source to locally heat or locally cool the working roller.

3. The self-healing device for roll wear according to claim 2, characterized in that: the TEC electronic temperature control plates are controlled independently, and a plurality of TEC electronic temperature control plates are coordinated and matched.

4. A control method for the self-healing device for the wear of the roller according to claim 3, comprising the following steps:

step S1: connecting the devices according to the sequence, and testing whether the cooling circulation system works normally; testing whether the data acquisition system and the temperature control system work normally and carrying out balance zero clearing; carrying out short circuit test on the direct current power supply; carrying out short-time power-on test on the TEC electronic temperature control sheet, and detecting whether each temperature sensor is abnormal or not;

step S2: after each temperature sensor is abnormal, the TEC electronic temperature control chip starts to be electrified, and meanwhile, the data acquisition system is used for acquiring and recording the data of each sensor;

step S3: obtaining a variation curve of the radial variation of the working roll along with the heating time;

step S4: the working roller is processed in a partitioning mode and divided into N sections, and each section is l/N mm long; the radial variation epsilon of the working roll can be obtained according to the steps S2 and S3 and the existing wear roll shape forecasting system_yAs a function of the current magnitude I, the current-carrying time T and the temperature T_yF (I, T); determining a reasonable wear threshold epsilon from the functional relationship_y0；

Step S5: the radial variation ε of any segment can be obtained according to step S2_kAnd temperature T_kFunction epsilon over time t_k＝f(t)、T_k(t), wherein t is the heating time;

step S6: (1) forecasting the roll shape of the working roll according to the existing wear forecasting system, and starting a kth interval control system to electrify the TEC electronic temperature control plate when local wear occurs in the kth interval;

(2) when the amount of wear reaches a critical value of wear epsilon_y0In the process, according to the wear data given by the roll shape forecasting system and the temperature data acquired by the data acquisition system, and by combining the functional relation of the step S5, the working power required by thermal compensation or cooling retraction can be obtained; the control means is to control the current of the TEC electronic temperature control chip so as to control the output power;

(3) if the abrasion area appears between the two sections, namely the abrasion area appears at the boundary of the k-th interval and the k + 1-th interval, the current of the TEC electronic temperature control sheet at the abrasion offset side is increased according to the abrasion degree and the offset, so that the convexity of the compensated roller deviates to the abrasion offset interval;

(4) when the working roll reaches a certain rolling kilometer number and has large-area abrasion, such as typical cat-ear-shaped abrasion, the k section where a few high points are located or the boundary between the k section and the k +1 section can be determined according to an abrasion roll shape forecasting system; enabling a few high points in the roll shape of the working roll to retract by utilizing the refrigeration function of the TEC electronic temperature control sheet according to the step (3), so that the roll shape of the working roll returns to normal;

step S7: the temperature sensor monitors the temperature of each TEC electronic temperature control chip in real time, converts a temperature signal into an electric signal and transmits the electric signal to the temperature control system along the output lead; and the temperature control system adjusts the output current of the power supply according to the signal transmitted by the temperature sensor and the functional relation obtained in the step S5 so as to ensure the stability of the regulated roll shape curve.

Technical Field

The invention relates to the technical field of roll shape curve regulation and control of a roll, in particular to a self-healing device for roll abrasion and a control method thereof.

Background

The roller is the main executive component of the rolling process and takes on the main task of metal plastic working forming. In the metal rolling process, the roller can resist the deformation of a rolled piece by self deformation, and then the forming of the rolled piece is realized. However, in this process, the roll is subjected to rolling pressure, roll bending force, transverse friction force, non-uniform contact pressure between the rolls and the like, and further material reduction of the roll itself, that is, abrasion, is generated. When the wear reaches a certain level, the roll gap of the rolling mill is difficult to control due to the influence of the roll shape change of the roll, and the plate thickness problem is finally induced. In order to ensure stable production scheduling of the rolling mill, the rolling mill needs to be removed from the mill for trimming after rolling for a certain kilometer, the original roll shape of the rolling mill is recovered in a thinning roll mode, and then the rolling mill is put on line. Therefore, the roller needs to go through the processes of 'threading-grinding-threading again-grinding again' for a plurality of times until the diameter of the roller is reduced to be difficult to thread. Meanwhile, the abrasion is a nonlinear process, and after the roller is subjected to primary abrasion, the roller is further accelerated to be abraded in the rolling process on the basis of the primary abrasion, so that the roller shape is worse along with the production process. In order to solve the problem, the existing solution mainly comprises the design of a wear-resistant roller, the design of a wear-resistant roller material and the design of an online coping device. Patent CN112095053A proposes 'a high-wear-resistance cold-rolling roller and a preparation method thereof', the invention enables the roller to have higher roughness retention capacity by increasing the content of elements such as Mo, V, Ti and the like, thereby improving the wear resistance of the roller. Patent CN03230784.5 proposes an "on-line grinding device for work rolls", which is to use a grinding device on a rolling mill to grind the surface of a work roll without unloading the roll, so as to reduce the times of replacing the roll on the premise of ensuring the product quality.

However, the above solutions all have the corresponding problems: no matter the wear-resistant roller or the wear-resistant roller material is designed, the roller is always worn due to a series of factors such as rolling force, contact force, friction force, a large amount of heat generated in the rolling process, chemical action of cooling liquid and the like, and finally the roller is off-line. On the other hand, the designed roll shape is usually only suitable for the specific rolling mill characteristics and the specific working conditions, and the payment is not in direct proportion to the income. The online grinding device can increase the complexity of the structure of the rolling mill system and increase the failure rate of equipment. In addition, the on-line grinding avoids the grinding process of the grinding machine, but the production rhythm is disturbed, so that the production is discontinuous. Patent CN03230784.5 proposes an "on-line grinding device for work rolls", but due to structural limitation, the grinding flexibility and grinding depth are poor, and the roll changing period of the roll can only be prolonged to a certain extent. In summary, the prior art has certain defects and shortcomings, and whether the prior art can produce ideal effects in practical application is still to be further discussed.

Disclosure of Invention

In view of the above problems, an object of the present invention is to provide a roller wear self-healing device and a control method thereof, which perform roll profile compensation in time at the initial stage of wear of a work roller, so as to form a dynamic compensation effect following grinding and compensation, thereby prolonging the life cycle of the work roller. On the other hand, the technical problems of insufficient flexibility of the convexity of the adjusting roller, complex control structure, overlong online grinding time, poor continuity and the like in the prior art are solved.

The technical scheme adopted by the invention is as follows:

the invention provides a roller abrasion self-healing device and a control method thereof, wherein the device comprises a working roller, heat-conducting silicone grease, a TEC electronic temperature control sheet, a water cooler, a temperature sensor lead and a direct-current power supply lead; the temperature sensors are respectively arranged at the hot end and the cold end of the TEC electronic temperature control sheet and are used for directly measuring the temperatures of the hot end and the cold end; the TEC electronic temperature control plates are arranged in n number at equal intervals along the axial direction of the working roll, are arranged in m rows at equal intervals along the circumferential direction of the working roll and are axially parallel to the working roll; one end face of the TEC electronic temperature control sheet is contacted with the inner wall of the working roller through heat conduction silicone grease; the other end face of the TEC electronic temperature control sheet is in contact with and fixed with a water cooler through heat conduction silicone grease, the water coolers are arranged in m rows at equal intervals along the circumferential direction of the working roller, and each water cooler can bear a plurality of axial TEC electronic temperature control sheets; the TEC electronic temperature control plates are arranged in this way and are loaded through m water coolers; the water cooler is externally connected to the water pump and the circulating water tank; the TEC electronic temperature control chip is externally connected to a direct current power supply through a direct current power supply lead; the temperature sensor is externally connected to the data acquisition system through a temperature sensor wire, and the data acquisition system transmits the collected temperature data to the temperature control system.

Further, the TEC electronic temperature control wafer can be used as an internal heat source to locally heat or locally cool the working roller.

Furthermore, the TEC electronic temperature control plates are controlled independently, and a plurality of TEC electronic temperature control plates are coordinated and matched.

A method for controlling self-healing of wear of a roll, the method comprising the steps of:

step S1: connecting the devices according to the sequence, and testing whether the cooling circulation system works normally; testing whether the data acquisition system and the temperature control system work normally and carrying out balance zero clearing; carrying out short circuit test on the direct current power supply; carrying out short-time power-on test on the TEC electronic temperature control sheet, and detecting whether each temperature sensor is abnormal or not;

step S2: after each temperature sensor is abnormal, the TEC electronic temperature control chip starts to be electrified, and meanwhile, the data acquisition system is used for acquiring and recording the data of each sensor;

step S3: obtaining a variation curve of the radial variation of the working roll along with the heating time;

step S4: the working roller is processed in a partitioning mode and divided into N sections, and each section is l/N mm long; the radial variation epsilon of the working roll can be obtained according to the steps S2 and S3 and the existing wear roll shape forecasting system_yAs a function of the current magnitude I, the current-carrying time T and the temperature T_yF (I, T); determining a reasonable wear threshold epsilon from the functional relationship_y0；

Step S5: the radial variation ε of any segment can be obtained according to step S2_kAnd temperature T_kFunction epsilon over time t_k＝f(t)、T_k(t), wherein t is the heating time;

step S6: (1) forecasting the roll shape of the working roll according to the existing wear forecasting system, and starting a kth interval control system to electrify the TEC electronic temperature control plate when local wear occurs in the kth interval;

(2) when the amount of wear reaches a critical value of wear epsilon_y0In the process, according to the wear data given by the roll shape forecasting system and the temperature data acquired by the data acquisition system, and by combining the functional relation of the step S5, the working power required by thermal compensation or cooling retraction can be obtained; the control means is to control the current of the TEC electronic temperature control chip so as to control the output power;

(3) if the abrasion area appears between the two sections, namely the abrasion area appears at the boundary of the k-th interval and the k + 1-th interval, the current of the TEC electronic temperature control sheet at the abrasion offset side is increased according to the abrasion degree and the offset, so that the convexity of the compensated roller deviates to the abrasion offset interval;

(4) when the working roll reaches a certain rolling kilometer number and has large-area abrasion, such as typical cat-ear-shaped abrasion, the k section where a few high points are located or the boundary between the k section and the k +1 section can be determined according to an abrasion roll shape forecasting system; enabling a few high points in the roll shape of the working roll to retract by utilizing the refrigeration function of the TEC electronic temperature control sheet according to the step (3), so that the roll shape of the working roll returns to normal;

step S7: the temperature sensor monitors the temperature of each TEC electronic temperature control chip in real time, converts a temperature signal into an electric signal and transmits the electric signal to the temperature control system along the output lead; and the temperature control system adjusts the output current of the power supply according to the signal transmitted by the temperature sensor and the functional relation obtained in the step S5 so as to ensure the stability of the regulated roll shape curve.

Compared with the prior art, the invention has the following beneficial effects:

1. the invention adopts a plurality of pieces of control, each TEC electronic temperature control piece can be used as an independent unit for control, and can adapt to a complex roll shape curve, especially a complex roll shape caused by abrasion due to multiple factors;

2. the TEC electronic temperature control sheet adopted by the invention can not only carry out heating compensation on the roll shape curve of the working roll, but also realize cooling retraction, thereby greatly improving the flexibility of regulating and controlling the roll shape curve and better coping with complex wear roll shape;

3. the TEC electronic temperature control chip adopted by the invention is a current transduction type chip, high-precision temperature control can be realized by controlling input current, and remote control and computer control are easily realized by adding a temperature detection and control means, so that an automatic control system is convenient to form;

4. the TEC electronic temperature control plate adopted by the invention has very small thermal inertia, the heating time is fast, and the temperature control plate can reach the maximum temperature difference under the condition of good cooling effect and less than one minute of electrification;

5. compared with a VC roller and a DSR roller, the invention has more flexible and changeable regulation and control effect, carries out dynamic compensation at the initial stage of wear and prolongs the roller changing period;

6. the TEC electronic temperature control chip adopted by the invention has a simple structure and low preparation price, and can effectively reduce the manufacturing cost.

Drawings

FIG. 1 is a schematic front sectional view of the present invention;

FIG. 2 is a schematic, diagrammatic left-side view in cross-section of the present invention;

FIG. 3 is a schematic view of a portion of the enlarged structure of FIG. 1;

fig. 4 is a schematic workflow diagram of the present invention.

Wherein, the reference numbers: 1-a working roll; 2-heat-conducting silicone grease; 3-TEC electronic temperature control chip; 4-a water cooler; 5-temperature sensor wire; 6-direct current power supply lead; 7-temperature sensor.

Detailed Description

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

It should be noted that in the description of the present invention, the terms "upper", "lower", "top", "bottom", "one side", "the other side", "left", "right", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not mean that a device or an element must have a specific orientation, be configured and operated in a specific orientation.

Referring to fig. 1 to 3, a specific structure of an embodiment of a self-healing device for roll wear according to the present invention is shown. The device comprises a working roll 1, heat-conducting silicone grease 2, a TEC electronic temperature control sheet 3, a water cooler 4, a temperature sensor lead 5, a direct-current power supply lead 6 and a temperature sensor 7; the temperature sensors 7 are respectively arranged at the hot end and the cold end of the TEC electronic temperature control sheet 3 and are used for directly measuring the temperatures of the hot end and the cold end; the TEC electronic temperature control sheets 3 are used as an internal heat source and can locally heat or locally cool the working roller 1, n TEC electronic temperature control sheets 3 are arranged at equal intervals along the axial direction of the working roller 1, m rows are arranged at equal intervals along the circumferential direction of the working roller 1 and are parallel to the axial direction of the working roller 1, the TEC electronic temperature control sheets 3 are independently controlled, and a plurality of TEC electronic temperature control sheets are in coordination; the hot end face of the TEC electronic temperature control sheet 3 is contacted with the inner wall of the working roller 1 through the heat conduction silicone grease 2, so that the heat exchange coefficient can be obviously improved; the cold end face of the TEC electronic temperature control chip 3 is in contact with and fixed to the water cooler 4 through the heat conduction silicone grease 2; the water coolers 4 are arranged in m rows at equal intervals in the working roll 1 along the circumferential direction of the working roll 1 and respectively correspond to the TEC electronic temperature control plates 3 in the m rows, the size of each water cooler 4 can be adjusted as required, and each water cooler 4 can bear a plurality of TEC electronic temperature control plates 3 which are axially arranged; the TEC electronic temperature control plates 3 are all arranged in this way and are loaded through m water coolers 4; the water cooler 4 is externally connected to a water pump and a circulating water tank; the TEC electronic temperature control chip 3 is externally connected to a direct current power supply through a direct current power supply lead 6; the temperature sensor 7 is externally connected to a data acquisition system through a temperature sensor wire 5, and the data acquisition system transmits the collected temperature data to the temperature control system.

A control method of a self-healing device for wear of a roller, as shown in fig. 4, the method comprises the following steps:

step S1: connecting the devices according to the sequence, and testing whether the cooling circulation system works normally; testing whether the signal acquisition system and the temperature control system work normally and carrying out balance zero clearing; carrying out short circuit test on the direct current power supply; carrying out short-time power-on test on the TEC electronic temperature control sheet 3, and detecting whether each temperature sensor 7 is abnormal or not;

step S2: after each temperature sensor 7 is abnormal, the TEC electronic temperature control plate 3 is electrified, and meanwhile, the data of each temperature sensor 7 is collected and recorded by using a data collection system;

step S3: acquiring a variation curve of the radial variation of the working roll 1 along with the heating time;

step S4: the working roll 1 is processed in a partitioning way and divided into N sections, and each section is l/N mm long; the radial variation epsilon of the working roll 1 can be obtained according to the steps S2 and S3 and the existing worn roll shape forecasting system_yAs a function of the current magnitude I, the current-carrying time T and the temperature T_yF (I, T); determining a reasonable wear threshold epsilon from the functional relationship_y0；

Step S5: the radial variation ε of any segment can be obtained according to step S2_kAnd temperature T_kFunction epsilon over time t_k＝f(t)、T_k(t), wherein t is the heating time;

step S6: (1) forecasting the roll shape of the working roll according to the existing wear forecasting system, and starting a kth interval control system to electrify the TEC electronic temperature control plate 3 when local wear occurs in the kth interval;

(2) when the amount of wear reaches a critical value of wear epsilon_y0In the process, according to the wear data given by the roll shape forecasting system and the temperature data acquired by the data acquisition system, and by combining the functional relation of the step S5, the working power required by thermal compensation or cooling retraction can be obtained; the control means is to control the current of the TEC electronic temperature control plate 3 so as to control the output power;

(3) if the abrasion area appears between the two sections, namely the boundary of the k-th interval and the k + 1-th interval, the current of the TEC electronic temperature control sheet 3 at the abrasion offset side is increased according to the abrasion degree and the offset, so that the convexity of the compensated roller deviates to the abrasion offset interval;

(4) when the working roll 1 reaches a certain rolling kilometer number and has large-area abrasion, such as typical cat-ear-shaped abrasion, the section k where a few high points are located or the boundary between the section k and the section k +1 can be determined according to an abrasion roll shape forecasting system; enabling a few high points in the roll shape of the working roll 1 to retract by utilizing the refrigeration function of the TEC electronic temperature control sheet 3 according to the step (3), and enabling the roll shape of the working roll 1 to return to normal;

step S7: the temperature sensor 7 monitors the temperature of each TEC electronic temperature control plate 3 in real time, converts a temperature signal into an electric signal and transmits the electric signal to the temperature control system along the temperature sensor lead 5; the temperature control system adjusts the output current of the power supply according to the signal transmitted by the temperature sensor 7 and the functional relationship obtained in step S5 to ensure the stability of the regulated roll shape curve.

The working principle of the invention is as follows: the roll shape compensation is carried out in time at the initial stage of the abrasion of the working roll 1 to form a dynamic compensation effect which is compensated along with the abrasion, so that the life cycle of the working roll 1 is prolonged; when the abrasion situation exceeds the dynamic compensation capacity, the roll shape of the working roll 1 is adjusted by cooling and retracting the abrasion high point. After the power supply is switched on, the TEC electronic temperature control sheets 3 start to work, heat at the hot ends of the TEC electronic temperature control sheets 3 is transferred to the working roller 1 through the heat-conducting silicone grease 2, the local part of the working roller 1 is heated or cooled, and then the corresponding adjustment of the roller shape curve according to the roller shape requirement is realized through the cooperative matching of the plurality of TEC electronic temperature control sheets 3. The existing wear roller shape forecasting system can monitor the wear condition of the working roller 1 in time; the temperature sensor 7 can monitor the temperature of each TEC electronic temperature control sheet 3 in real time, convert a temperature signal into an electric signal and transmit the electric signal to the temperature control system along an output lead; the temperature control system adjusts the voltage and current of the power supply according to the signal transmitted by the temperature sensor 7.

The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.