Material position detection device and method for two-roller reversible rolling mill for titanium alloy bars

Abstract

The invention discloses a two-roller reversible mill material position detection device and method for titanium alloy bars. Comprising an absolute value encoder I installed at the end of a driven roller in an inlet pinch roller, an absolute value encoder II installed at the end of an upper roller in a rolling mill main body and an absolute value encoder III installed at the end of a driven roller in an outlet pinch roller, and a Hall current sensor is installed on an inlet wire of a main motor driving the rollers to rotate in the rolling mill main body. The three absolute value encoders and the Hall current sensor are jointly and electrically connected with a position calculation PLC, and the position calculation PLC is electrically connected to the main PLC. When the two-roller reversible rolling mill is used for rolling the titanium alloy bars, the materials can be accurately positioned between the rollers and the tilting gear, the problem that in the prior art, due to the fact that a thermal detection sensor and a laser distance sensor are used, the materials are easily affected by the temperature and specification of the materials is solved, and therefore the rolling stability of equipment is improved, and the automation level is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of nonferrous metal processing, and in particular relates to a material position detection device for a two-roll reversible rolling mill for titanium alloy bars. The present invention also relates to a material position detection method for a two-roll reversible rolling mill for titanium alloy bars. Background Art

[0002] Due to its low density, high strength, good corrosion resistance, and excellent biocompatibility, titanium alloys have been widely used in aerospace, shipbuilding, chemical, and biomedical fields. Currently, two-roller transverse reversing mills are commonly used for the blanking and rolling of titanium alloy bars. Turning mills are installed at the entrance and exit of the reversing mill, and pinch rollers are installed inside the turning mill to clamp and move the material. Therefore, one of the keys to achieving fully automatic control of the equipment is to accurately locate the position of the rolled titanium alloy material when it enters the turning mill, ensuring that the pinch rollers can accurately clamp the rolled titanium alloy material when it exits the rolling rolls and enters the turning mill.

[0003] At present, the existing material position detection control method is to install a heat detection sensor and a single-point laser distance sensor on the steel turning machine, and use the heat detection sensor and laser sensor to detect whether the titanium alloy bar material enters the steel turning machine, thereby controlling the opening and closing of the pinch roller. However, through actual operation on site, it was found that: (1) Due to the variable diameter specifications of rolled materials, ranging from 20 mm to 150 mm, and the high temperature of the materials, which ranges from 800°C to 1200°C, the existing distance sensors using the principle of laser diffuse reflection are prone to failure in high temperature areas, resulting in the inability to reliably detect the materials and requiring frequent manual intervention.

[0004] (2) Since the grade of rolled materials often changes, different grades of materials have different rolling temperatures. The existing thermal detection sensors may have deviations in identifying the materials, which also causes the detection signal to fail.

[0005] The pinch rollers are not opened in time or are opened prematurely, causing the material to hit the steel turning machine, resulting in abnormal rolling process and equipment damage. In other words, the existing material position detection and control methods have problems such as poor control accuracy and low reliability. Summary of the Invention

[0006] The purpose of the present invention is to provide a two-roll reversible rolling mill material position detection device for titanium alloy bars, which solves the problem in the prior art that it is difficult to accurately control the position of materials entering the steel turning machine when rolling materials of different grades and specifications.

[0007] Another object of the present invention is to provide a method for detecting the material position of a two-roll reversible rolling mill for titanium alloy bars.

[0008] The first technical solution adopted by the present invention is: a two-roll reversible rolling mill material position detection device for titanium alloy bars, including an absolute value encoder I installed at the end of the driven roller in the entrance pinch roller, an absolute value encoder II installed at the end of the upper roller in the rolling mill body, and an absolute value encoder III installed at the end of the driven roller in the exit pinch roller. A Hall current sensor is installed on the input line of the main motor that drives the rollers to rotate in the rolling mill body. The absolute value encoder I, absolute value encoder II, absolute value encoder III and the Hall current sensor are electrically connected to a position calculation PLC, and the position calculation PLC is electrically connected to the main PLC.

[0009] The first technical solution of the present invention is also characterized in that: An infrared temperature sensor I is installed on the top of the entrance steel turning machine where the entrance pinch roller is located, close to the main body of the rolling mill. An infrared temperature sensor II is installed on the top of the exit steel turning machine where the exit pinch roller is located, close to the main body of the rolling mill.

[0010] An analog module is installed on the position calculation PLC, and the analog module is connected to the infrared temperature sensor I, infrared temperature sensor II and Hall current sensor through isolation transmitter I, isolation transmitter II and isolation transmitter III respectively.

[0011] The position calculation PLC is connected to the absolute value encoder I, the absolute value encoder II, and the absolute value encoder III through the CAN bus.

[0012] The main PLC and the position calculation PLC exchange data via the TCP / IP protocol.

[0013] The second technical solution adopted by the present invention is: a detection method for a material position detection device of a two-roll reversible rolling mill for titanium alloy bars, comprising the following steps: Step 1: Before rolling begins, the position calculation PLC obtains the rolling material grade information, total rolling passes, and material elongation of a single pass transmitted by the main PLC, and calls the program according to the pre-set conditions; Step 2: After forward rolling begins, when the rolled material exits the heating furnace and enters the entrance pinch roller along the conveyor roller, and the material head continues to move to the roller, the real-time position of the material head from the time it is bitten by the roller to the time it reaches the exit pinch roller is calculated. Then, the position of the material tail from the time it leaves the roller to the time it stops at the exit pinch roller is calculated. Step 3: After reverse rolling begins, when the tail of the rolled material moves in the reverse direction from the exit pinch roller to the roll, the real-time position of the tail of the rolled material from the moment it is bitten by the roll to the moment it reaches the entry pinch roller is calculated. Then, the position of the material head from the moment it leaves the roll to the moment it stops at the entry pinch roller is calculated. Step 4: Return to step 2 and perform forward rolling again. When repeating to the last pass, calculate the real-time position of the material head from the time it is bitten by the roll to the time it reaches the exit pinch roller.

[0014] The second technical solution of the present invention is also characterized in that: In step 2, after the rolled material comes out of the heating furnace, it enters the entrance steel turning machine along the conveyor roller. At this time, the entrance pinch roller is in the open state. When the infrared temperature sensor I installed on the top of the entrance steel turning machine near the main body of the rolling mill detects that the temperature of the rolled material between the entrance steel turning machine and the rolling roller is greater than the set value, the entrance pinch roller is closed and rotated to feed the rolled material into the rolling roller.

[0015] In step 2, the specific method for calculating the real-time position of the material head from the time it is bitten by the roller to the time it reaches the exit pinch roller is as follows: When the roll bites into the rolled material, the main motor current of the rolling mill detected by the Hall current sensor will increase. When it is greater than the set value, it is defined as time t1 and the calculation program is activated. At this time, the entrance pinch roll switches to a free state without providing power. The position calculation PLC reads and stores the speed v1 of the absolute encoder II at time t1 and reads and stores the speed v2 of the absolute encoder I at time t1. At time t2 after the set cycle, the speed v3 of the absolute encoder II and the speed v4 of the absolute encoder I are read again and stored. The roller material displacement L1 and the entrance material displacement L2 in the set single cycle are calculated: L1=

[0016] L2=

[0017] Then read the material elongation of a single pass δ Calculate the extension L3 of the material in the corresponding pass, then the outlet material displacement s of a single cycle n for: s n =L1+L3 sh-L2 Where, sh is the correction value; Finally, the outlet material displacement s of several single cycles is calculated cumulatively n The total displacement S is obtained total : S total =

[0018] Where n is the number of cycles; when the total displacement S total When the set value is reached, it is determined that the rolling material head has reached the exit pinch roller, and the exit pinch roller closes to clamp the material head, and the calculation stops at this moment.

[0019] In step 2, the specific method for calculating the stopping position of the tail of the material after it leaves the roller and reaches the exit pinch roller is: When the Hall current sensor detects that the current of the main motor of the rolling mill body decreases to the no-load current, it is determined that the tail of the rolled material has left the roller. At this moment t3, the calculation program is activated again. The position calculation PLC reads the speed v5 of the absolute encoder III at time t3 and stores it. At time t4 after the set cycle, the speed v6 of the absolute encoder III is read again and stored. The displacement L4 of the rolled material in the set single cycle is calculated: L4=

[0020] Finally, the displacement L4 of several single cycles is accumulated and calculated. When the total displacement reaches the set value, the outlet pinch roller stops rotating and the calculation stops at this moment.

[0021] In step 3, the specific method for calculating the real-time position of the material tail from the time it is bitten by the roller to the time it reaches the entrance pinch roller is the same as the specific method for calculating the real-time position of the material head from the time it is bitten by the roller to the time it reaches the exit pinch roller in step 2; the specific method for calculating the stopping position of the material head from the time it is separated from the roller to the entrance pinch roller in step 3 is the same as the specific method for calculating the stopping position of the material tail from the time it is separated from the roller to the exit pinch roller in step 2.

[0022] The beneficial effects of the present invention are as follows: the material position detection device and method of the two-roll reversible rolling mill for titanium alloy bars of the present invention can realize the accurate positioning of the material between the rolling rollers and the steel turning machine when the two-roll reversible rolling mill rolls titanium alloy bars, avoiding the problem of being easily affected by the material temperature and specifications caused by the use of thermal detection sensors and laser distance sensors in the prior art, thereby improving the rolling stability of the equipment and enhancing the level of automation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of a material position detection device for a two-roll reversible rolling mill for titanium alloy bars according to the present invention; Figure 2 It is a side view structural schematic diagram of a rolling mill main body in a material position detection device for a two-roller reversible rolling mill for titanium alloy bars according to the present invention; Figure 3 The diagram is a structural diagram of a control system in a material position detection device of a two-roller reversible rolling mill for titanium alloy bars according to the present invention.

[0024] In the figure, 1. Entrance steel turning machine, 2. Infrared temperature sensor I, 3. Entrance pinch roller, 4. Absolute encoder I, 5. Absolute encoder II, 6. Rolling roller, 7. Infrared temperature sensor II, 8. Exit steel turning machine, 9. Exit pinch roller, 10. Absolute encoder III, 11. Hall current sensor, 12. Main motor, 13. Rolling mill body, 14. Rolled material, 15. Main PLC, 16. Position calculation PLC, 17. Analog module, 18. Isolation transmitter I, 19. Isolation transmitter II, 20. Isolation transmitter III. DETAILED DESCRIPTION

[0025] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] The present invention provides a material position detection device and method for a two-roll reversible rolling mill for titanium alloy bars, which consists of a hardware detection unit and a position calculation program. The hardware detection unit includes a Hall current sensor installed on the three phases of the motor, which is used to collect the real-time current value of the rolling main motor. The absolute encoder installed on the rolling roller, the entrance pinch roller, and the exit pinch roller is used to detect the actual rotational speed value of the above components. The infrared temperature sensor installed on the entrance and the top of the steel turning machine can detect the real-time temperature of the rolled material passing through the rolling roller. The above-mentioned measured data enters the position calculation PLC program through the communication and analog interface of the position calculation PLC and is encapsulated into a program block for calculation. The actual position of the output material is calculated through a composite calculation based on parameters such as the calculation start / end, the rolling roller speed, the exit and entrance steel turning machine pinch roller speed, the rolling motor current, the total rolling passes, the current rolling pass, the single pass material elongation, etc. The material position detection device and method of the present invention realizes a method for detecting the rolling position of the rolled titanium alloy bar material by using the rolling speed without relying on a single-point laser distance sensor and a thermal detection sensor. The advantages are as follows: compared with the existing method using a single-point laser distance and thermal detection sensor, the material position judgment is inaccurate due to the influence of the temperature, specification and brand of the titanium alloy material, and the problem of affecting the opening timing of the pinch roller causes the material to hit the steel turning machine, resulting in abnormal rolling process and equipment damage. The technology of calculating the rolling material position by using the rolling roller speed, the pinch roller speed and the material elongation can accurately calculate the exact position of the head and tail of the rolled titanium alloy bar material in the rolling process, and is not affected by the specifications and temperature of the titanium alloy bar material, thereby reducing the risk of equipment abnormality and improving the level of automation.

[0027] Example 1 The present invention provides a material position detection device for a two-roll reversible rolling mill for titanium alloy bars, such as Figures 1 to 3 Shown, including: The hardware detection unit includes a Hall current sensor 11 installed on the three phases of the main motor 12. The Hall current sensor 11 collects the real-time current value of the rolling main motor 12. The absolute encoder II5 installed at the end of the roll 6 can obtain the actual speed value of the roll 6. The driven rolls of the pinch rolls of the entry rewinding machine 1 and the exit rewinding machine 8 are equipped with an absolute encoder I4 and an absolute encoder III10 through a coupling to detect the real-time speed of the entry pinch roll 3 and the exit pinch roll 9. The infrared temperature sensor I2 and the infrared temperature sensor II7 installed at the entrance and the top of the rewinding machine can detect the real-time temperature of the rolled material passing through the roll 6. The detection area is the area between the rewinding machine and the roll 6.

[0028] Material position calculation is implemented using a PLC16 program encapsulated as a block within the program. Input parameters include calculation start / end, roll speed, exit and entry roll feeder speeds, rolling motor current, total roll passes, current roll pass, and material elongation per roll. This composite calculation outputs the actual material position. Infrared temperature sensors are primarily used to re-evaluate the material's exit thresholds at the head and tail of the rolls, ensuring system safety.

[0029] Considering the need for the system's main PLC (PLC) 15 to perform the logic and closed-loop control of the entire two-roll reversing mill rolling system, and given that existing position calculation programs consume significant resources, performing position calculations in the main PLC (PLC) 15 would increase system load and slow the overall system speed. Therefore, a dedicated position calculation PLC (PLC) 16 is set up to calculate material position, and the calculated data is transmitted to the main PLC (PLC) 15 via communication. The operating current of the main motor (12) is detected by a high-speed, high-precision Hall effect current sensor (11). To ensure data stability, the current signal and isolation transmitter modules (Isolation Transmitter I 18, Isolation Transmitter II 19, and Isolation Transmitter III 20) are fed into the analog module (17) of the position calculation PLC (PLC) 16. The absolute encoders for the rolls and pinch rolls are transmitted to the position calculation PLC (PLC) 16 via a real-time bus, and data from the infrared temperature sensor is transmitted to the position calculation PLC (PLC) 16 via analog signals.

[0030] The material position calculation unit can automatically select the corresponding calculation parameters according to the different grades of materials being rolled, the number of rolling passes, the rolling deformation, and the rolling speed, thereby accurately calculating the material position without affecting the PLC load.

[0031] Example 2 The present invention provides a method for detecting the material position of a two-roll reversible rolling mill for titanium alloy bars, comprising the following steps: P1. Parameter setting stage: Before rolling starts, the position calculation PLC16 obtains the relevant data information transmitted by the main PLC15 and calls the program according to the pre-set conditions.

[0032] P2. Forward rolling calculation: It is mainly used to calculate the position of the rolled material 14 after it comes out of the heating furnace and enters the entrance steel turning machine 1 along the conveyor roller. It includes the position of the material head from the entrance steel turning machine 1 to the roller 6 and then to the exit steel turning machine 8, and the position of the material tail after it comes out of the roller 6 to the exit steel turning machine 8. After the speed of the clamping rollers of the exit steel turning machine 8 clamping the material drops to 0, one rolling pass is completed.

[0033] P3. Reverse rolling calculation: After the mill hole is adjusted, the outlet pinch roller 9 clamps the material and rotates in the reverse direction, and the mill roller 6 rotates in the reverse direction. At this time, the definition of the material head and the material tail is flipped. After the roller 6 bites into the material, the material head is calculated from the position of the roller 6 to the entrance steel turning machine 1, and the material tail is calculated from the roller 6 to the entrance steel turning machine 1. After the speed of the pinch rollers of the entrance steel turning machine 1 clamping the material drops to 0, one rolling pass is completed, the mill is adjusted to the next pass, and the forward rolling calculation is executed again until the last rolling pass.

[0034] P4. Calculation of the end of rolling: When the rolling pass is the last pass, it is forward rolling. In this stage, only the position of the material head exiting the rolling roller 6 and arriving at the exit steel turning machine 8 is calculated.

[0035] Example 3 The present invention provides a material position detection device for a two-roll reversible rolling mill for titanium alloy bars, such as Figures 1 to 3 Shown, including: The entrance pinch roller 3 and the driven roller are equipped with an absolute encoder Ⅰ4 at their ends for detecting the rotation speed of the pinch roller 3. The entrance turning machine 1 is equipped with an infrared temperature sensor Ⅰ2 on the upper side close to the rolling roller 6. Its main function is to detect the temperature of the material when it passes between the entrance turning machine 1 and the rolling roller 6, which is used for safety judgment of the rolled material 14.

[0036] The rolling mill body 13 is equipped with a roller 6, and the upper roller is equipped with an absolute encoder II5 for detecting the speed of the roller 6. The main motor 12 is equipped with a Hall current sensor 11, which can detect the operating current of the main motor 12 and thus reflect the rolling load changes.

[0037] The exit pinch roller 9 is also a driven roller, and an absolute encoder III 10 is installed at its end to detect the rotation speed of the exit pinch roller 9. The exit steel turning machine 8 is equipped with an infrared temperature sensor II 7 on the upper part close to the roller side. Its main function is to detect the temperature of the material when it passes between the exit steel turning machine 8 and the roller 6, which is used for safety judgment of the rolled material 14.

[0038] The detection device's control system includes a position calculation PLC 16, which exchanges data with the existing main PLC 15 via the TCP / IP protocol. Position calculation PLC 16 is connected to absolute encoders I 4, II 5, and III 10 via the CAN bus. The CAN bus offers excellent real-time performance, ensuring high-speed data transmission. Position calculation PLC 16 is equipped with an analog module 17, which is connected to infrared temperature sensors I 2, II 7, and Hall effect current sensor 11 in separate channels. To prevent interference and maintain data stability, analog module 17 is connected to infrared temperature sensors I 2, II 7, and Hall effect current sensor 11 via isolation transmitters I 18, II 19, and III 20, respectively. Therefore, the actual position of the output material is calculated by compositely calculating the rotational speed of the absolute encoder Ⅱ5 installed on the rolling roller 6, the absolute encoder Ⅲ10 installed on the outlet pinch roller 9 and the absolute encoder Ⅰ4 installed on the inlet pinch roller 3, the rolling motor current detected by the Hall current sensor 11 installed on the main motor 12 and the total rolling passes, current rolling pass and single-pass material elongation from the main PLC15.

[0039] Example 4 The present invention provides a material position detection method for a two-roll reversible rolling mill for titanium alloy bars, comprising the following steps: P1. Parameter setting stage: Before rolling starts, the position calculation PLC16 obtains the relevant data information transmitted by the main PLC15, calls the program according to the pre-set conditions, and obtains data in the form of TCP / IP.

[0040] P2. Forward rolling calculation: It is mainly used to calculate the position of the rolled material 14 after it comes out of the heating furnace and enters the entrance steel turning machine 1 along the conveyor roller. It includes the position of the head of the rolled material 14 from the entrance steel turning machine 1 to the roller 6 and then to the exit steel turning machine 8. The position of the tail of the rolled material 14 after it comes out of the roller 6 and reaches the exit steel turning machine 8. After the speed of the outlet pinch roller 9 inside the exit steel turning machine 8 clamping the material drops to 0, one rolling pass is completed.

[0041] P3. Reverse rolling calculation: After the hole type of the rolling mill body 13 is adjusted, the outlet pinch roller 9 clamps the rolled material 14 and rotates in the opposite direction, and the roller 6 rotates in the opposite direction. At this time, the material head and the material tail are defined to be flipped. After the roller 6 bites into the material, the position of the rolled material 14 head from the roller to the entrance steel turning machine 1 is calculated, and the position of the rolled material 14 tail from the roller to the entrance steel turning machine 1 is calculated. After the speed of the material clamped by the entrance pinch roller 3 drops to 0, one rolling pass is completed, the rolling mill is adjusted to the next pass, and the forward rolling calculation is executed again until the last rolling pass.

[0042] P4. Calculation of the end of rolling: When the rolling pass is the last pass, it is forward rolling. In this stage, only the position of the head of the rolled material 14 leaving the rolling roller 6 and arriving at the exit steel turning machine 8 is calculated.

[0043] In the above process, the position is calculated by using the rolling speed of the material and calculating the accumulated displacement within the set time. The corresponding set time can be automatically adjusted according to different specifications of materials and rolling passes.

[0044] Example 5 The present invention provides a material position detection device for a two-roll reversible rolling mill for titanium alloy bars, such as Figures 1 to 3 As shown, it includes an entrance turning machine 1, which is mainly used for clamping and turning the rolled materials. An entrance pinch roller 3 is installed inside the entrance turning machine 1. The entrance pinch roller 3 consists of a pair of rollers, one of which is actively driven by a hydraulic motor, and the other is driven. An absolute encoder Ⅰ4 is installed at its end to detect the rotation speed of the entrance pinch roller 3. An infrared temperature sensor Ⅰ2 is installed on the upper part of the entrance turning machine 1 near the rolling roller 6. Its main function is to detect the temperature of the material when passing between the entrance turning machine 1 and the rolling roller 6, which is used for safety judgment whether the rolled material 14 passes normally.

[0045] The rolling mill body 13 is equipped with two rollers, one upper and one lower. A main motor 12 drives the rollers 6 via a reducer and coupling. The reducer ensures that both rollers rotate at the same speed. An absolute encoder II5 is installed on the upper roller of the roller 6 to detect the roller's speed. A Hall effect current sensor 11 is installed on the main motor 12 input line to detect the motor's operating current, thereby reflecting changes in the rolling load.

[0046] The function of the export steel turning machine 8 is the same as that of the import steel turning machine 1. It is equipped with export pinch rollers 9 inside, which are also composed of a pair of rollers, one of which is actively driven by a hydraulic motor and the other is driven. An absolute encoder Ⅲ10 is installed at the end to detect the rotation speed of the export pinch roller 9. The export steel turning machine 8 is equipped with an infrared temperature sensor Ⅱ7 on the upper part near the rolling roller side. Its main function is to detect the temperature of the material when it passes between the export steel turning machine 8 and the rolling roller 6, which is used to judge the safety of the rolled material 14.

[0047] The control system includes a position calculation PLC 16, which exchanges data with the existing main PLC 15 via the TCP / IP protocol. Position calculation PLC 16 is connected to absolute encoders I 4, II 5, and III 10 via the CAN bus. The CAN bus offers excellent real-time performance, ensuring high-speed data transmission. Position calculation PLC 16 is equipped with an analog module 17, which is connected to infrared temperature sensors I 2, II 7, and Hall effect current sensor 11 in separate channels. To prevent interference and maintain data stability, analog module 17 is connected to infrared temperature sensors I 2, II 7, and Hall effect current sensor 11 via isolation transmitters I 18, II 19, and III 30, respectively.

[0048] Example 6 The present invention provides a method for detecting the material position of a two-roll reversible rolling mill for titanium alloy bars, comprising the following steps: P1. Parameter setting stage: Before rolling starts, the position calculation PLC16 obtains the relevant information transmitted by the main PLC15, including the brand information of the rolled material 14, the total rolling passes, and the material elongation of a single pass. According to the pre-set conditions, different rolling passes are corresponding to different interruption cycles and the program is activated.

[0049] P2. Forward rolling calculation: After the material is discharged from the heating furnace, it enters the entrance steel turning machine 1 along the conveyor roller. At this time, the entrance pinch roller 3 of the entrance steel turning machine 1 is in the open state. When the infrared temperature sensor Ⅰ2 of the entrance steel turning machine 1 detects that the temperature is greater than the set value, the entrance pinch roller 3 is closed, and the entrance pinch roller 3 rotates to feed the rolled material 14 into the roller 6. When the roller 6 bites into the rolled material 14, the current of the rolling main motor 12 detected by the Hall current sensor 11 will increase. When it is greater than the set value, it is defined as the time when the calculation program is activated at t1. At this time, the entrance pinch roller 3 becomes a free state without providing power. The absolute value encoder Ⅱ5 speed v1 of the roller at t1 is read and stored. The absolute value encoder Ⅰ4 speed v2 of the entrance pinch roller 3 at t1 is read and stored. The absolute value encoder Ⅱ5 speed v3 and the absolute value encoder Ⅰ4 speed v4 of the entrance pinch roller 3 are read again at t2 of the next cycle. At this time, the roller displacement l1= at t1 and t2 is calculated. , inlet material displacement l2= According to the reading of single-pass deformation rate δ1 Calculate the extension of the material in this pass l3, the displacement of the outlet material s1=l1+l3 sh-l2, where sh is the correction value, which is related to the material grade and rolling pass. The correction value sh data has been built into the position calculation PLC16 program. Since the time period from t1 to t2 is mostly at the level of 100ms, the total displacement S can be calculated by accumulating multiple s. total = , when t2-t1 is smaller, s under fixed displacement n The greater the number, the more accurate the calculation result will be, but the load on the system will also increase. total When the set value is reached, it is considered that the head of the rolled material 14 has reached the exit steel turning machine 8, and the exit pinch roller 9 of the exit steel turning machine 8 closes to clamp the material. At this moment, the calculation stops and the above time, speed and displacement parameters are reset to zero. When the Hall current sensor 11 detects that the main motor current is reduced to the no-load current, it is considered that the tail of the rolled material 14 has left the roller 6. At this moment, the calculation program is activated again at t3, and the speed of the absolute encoder III10 of the outlet pinch roller 9 is valid. At this moment, the speed v5 of the absolute encoder III10 of the outlet pinch roller 9 at this moment is read and stored. The speed v6 of the absolute encoder III10 of the outlet pinch roller 9 is read again at the next interruption cycle t4. At this time, the displacement l4 of the rolled material 14 during this period is calculated to be Since the rolled material 14 has already separated from the roller 6 at this point, the exit pinch roller 9 stops rotating when it reaches the set displacement, and the calculation stops. The data for t3, t4, v5, and v6 are reset to zero. During this stage, the exit pinch roller 9 is decelerating, and the speed changes rapidly. For accurate calculation, a short interval t4-t3 is selected, typically 10ms. At this point, the first pass is considered complete.

[0050] P3, reverse rolling calculation: After the rolling mill body 13 completes the pass adjustment, the outlet pinch roll 9 clamps the rolled material 14 and rotates in the opposite direction, and the roll 6 rotates in the opposite direction. At this time, the head and tail of the rolled material 14 are defined as flipped. After the roll 6 bites into the rolled material 14, the Hall current sensor 11 detects the increase in current and starts displacement calculation. At this time, the speed of the absolute encoder II5 installed on the rolling mill roll 6 and the absolute encoder III10 installed on the outlet pinch roll 9 are used as the speed calculation source. Combined with the deformation correction value of this pass, the method is the same as P2. When the calculated displacement reaches the set value, the inlet pinch roll 3 closes and clamps the material, the calculation stops, and the relevant data is cleared. When the Hall current sensor 11 detects that the rolling current drops to the no-load current, the calculation is started. At this time, the speed source is the speed of the absolute encoder Ⅰ4 on the entrance pinch roller 3. The position of the rolled material 14 can be calculated by integrating the speed of the absolute encoder Ⅰ4 on the entrance pinch roller 3 according to time. When the set position is reached, the rotation of the entrance pinch roller 3 is stopped, and the forward rolling calculation is executed again until the last rolling pass.

[0051] P4. Calculation of the end of rolling: When the rolling pass is the last pass, it is forward rolling. After the outlet pinch roller 9 clamps the rolled material 14, the outlet pinch roller 9 rotates forward. At this time, the displacement is no longer calculated until the rolled material 14 leaves the outlet steel turning machine 8.

Claims

1. A material position detection device for a two-roll reversible rolling mill for titanium alloy bars, characterized in that: The present invention comprises an absolute value encoder I (4) installed at the end of the driven roller in the entrance pinch roller (3), an absolute value encoder II (5) installed at the end of the upper roller (6) in the rolling mill body (13), and an absolute value encoder III (10) installed at the end of the driven roller in the exit pinch roller (9). A Hall current sensor (11) is installed on the input line of the main motor (12) driving the roller (6) in the rolling mill body (13). The absolute value encoder I (4), the absolute value encoder II (5), the absolute value encoder III (10) and the Hall current sensor (11) are electrically connected to a position calculation PLC (16), and the position calculation PLC (16) is further electrically connected to the main PLC (15).

2. The material position detection device for a two-roll reversible rolling mill for titanium alloy bars according to claim 1, characterized in that: An infrared temperature sensor I (2) is installed on the top of the entrance steel turning machine (1) where the entrance pinch roller (3) is located, close to the rolling mill body (13), and an infrared temperature sensor II (7) is installed on the top of the exit steel turning machine (8) where the exit pinch roller (9) is located, close to the rolling mill body (13).

3. The material position detection device for a two-roll reversible rolling mill for titanium alloy bars according to claim 1, characterized in that: The position calculation PLC (16) is equipped with an analog module (17), and the analog module (17) is connected to the infrared temperature sensor I (2), the infrared temperature sensor II (7), and the Hall current sensor (11) through the isolation transmitter I (18), the isolation transmitter II (19), and the isolation transmitter III (20).

4. The material position detection device for a two-roll reversible rolling mill for titanium alloy bars according to claim 1, characterized in that: The position calculation PLC (16) is connected to the absolute value encoder I (4), the absolute value encoder II (5), and the absolute value encoder III (10) via a CAN bus.

5. The material position detection device for a two-roll reversible rolling mill for titanium alloy bars according to claim 1, characterized in that: The main PLC (15) and the position calculation PLC (16) exchange data via the TCP / IP protocol.

6. The detection method of the material position detection device of the two-roll reversible rolling mill for titanium alloy bars according to claim 1, characterized in that: The following steps are involved: Step 1: Before rolling begins, the position calculation PLC obtains the material condition parameters transmitted by the main PLC; Step 2: Forward rolling: calculate the real-time position of the material head from the time it is bitten by the roll to the time it reaches the exit pinch roll, and then calculate the position of the material tail from the time it leaves the roll to the time it stops at the exit pinch roll; Step 3: Rolling in reverse direction, calculate the real-time position of the tail of the material from the time it is bitten by the roller to the time it reaches the entrance pinch roller, and then calculate the position of the head of the material from the time it leaves the roller to the time it stops at the entrance pinch roller; Step 4: Return to step 2 and perform forward rolling again. When repeating to the last pass, calculate the real-time position of the material head from the time it is bitten by the roll to the time it reaches the exit pinch roller.

7. The material position detection method of the material position detection device of the two-roll reversible rolling mill for titanium alloy bars according to claim 6, characterized in that: In the step 2, after the rolled material (14) is discharged from the heating furnace, it enters the entrance turning mill (1) along the conveyor roller. At this time, the entrance pinch roller (3) is in an open state. When the infrared temperature sensor I (2) installed on the top of the entrance turning mill (1) close to the rolling mill body (13) detects that the temperature of the rolled material (14) between the entrance turning mill (1) and the roller (6) is greater than the set value, the entrance pinch roller (3) is closed and rotated to feed the rolled material (14) into the roller (6).

8. The material position detection method of the material position detection device of the two-roll reversible rolling mill for titanium alloy bars according to claim 6, characterized in that: In step 2, the specific method for calculating the real-time position of the material head from the time when the material head is bitten by the roller (6) to the time when the material head reaches the outlet pinch roller (9) is as follows: When the roller (6) bites into the rolled material (14), the current of the main motor (12) of the rolling mill body (13) detected by the Hall current sensor (11) increases. When the current is greater than the set value, it is defined as time t1 and the calculation program starts to be activated. At this time, the entrance pinch roller (3) switches to a free state without providing power. The position calculation PLC (16) reads the speed v1 of the absolute value encoder II (5) at time t1 and stores it, and reads the speed v2 of the absolute value encoder I (4) at time t1 and stores it; at time t2 after the set cycle, the speed v3 of the absolute value encoder II (5) and the speed v4 of the absolute value encoder I (4) are read again and stored, and the roller material displacement L1 and the entrance material displacement L2 in the set single cycle are calculated: L1= L2= Then read the material elongation of a single pass δ Calculate the extension L3 of the material in the corresponding pass, then the outlet material displacement s of a single cycle n for: <h2 style=";text-align:left;direction:ltr">s<h2 style=";text-align:left;direction:ltr"> n <h2 style=";text-align:left;direction:ltr"> =L1+L3<h2 style=";text-align:left;direction:ltr"> <h2 style=";text-align:left;direction:ltr"> sh-L2 Where, sh is the correction value; Finally, the outlet material displacement s of several single cycles is calculated cumulatively n The total displacement S is obtained total : S total = Where n is the number of cycles; when the total displacement S total When the set value is reached, it is determined that the head of the rolled material (14) has reached the outlet pinch roller (9), and the outlet pinch roller (9) is closed to clamp the head of the rolled material, and the calculation is stopped at this moment.

9. The material position detection method of the material position detection device of the two-roll reversible rolling mill for titanium alloy bars according to claim 6, characterized in that: In step 2, the specific method for calculating the stopping position of the tail of the material after it leaves the roller (6) and reaches the exit pinch roller (9) is as follows: When the Hall current sensor (11) detects that the current of the main motor (12) of the rolling mill body (13) decreases to the no-load current, it is determined that the tail of the rolled material (14) has left the roller (6). At this moment t3, the calculation program is activated again. The position calculation PLC (16) reads the speed v5 of the absolute value encoder III (10) at moment t3 and stores it. At moment t4 after the set cycle, the speed v6 of the absolute value encoder III (10) is read again and stored. The displacement L4 of the rolled material (14) in the set single cycle is calculated: L4= Finally, the displacement L4 of several single cycles is accumulated and calculated, and when the total displacement reaches the set value, the outlet pinch roller (9) stops rotating and the calculation stops at this moment.

10. The material position detection method of the material position detection device of the two-roll reversible rolling mill for titanium alloy bars according to claim 6, characterized in that: In step 3, the specific method for calculating the real-time position of the material tail after being bitten by the roller (6) and moving to the entrance pinch roller (3) is the same as the specific method for calculating the real-time position of the material head after being bitten by the roller (6) and moving to the exit pinch roller (9) in step 2; the specific method for calculating the stop position of the material head after being separated from the roller (6) and moving to the entrance pinch roller (3) in step 3 is the same as the specific method for calculating the stop position of the material tail after being separated from the roller (6) and moving to the exit pinch roller (9) in step 2.

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