A control method for controlling the weight of a billet based on non-length calculation of a bar

Abstract

The present application relates to the technical field of continuous casting and rolling production shear control, and specifically discloses a control method for controlling the weight of a billet based on non-fixed-length calculation of a bar, comprising the following steps: 1) billet tracking during hot charging and straight rolling, ① virtual position triggering, ② flow number transmission, and ③ consistent with cold billet signal tracking technology after the billet enters the rolling line; 2) a calculation method based on non-fixed-length of the bar; 3) the length remaining after the last fixed-length of the rolling line is cut by the fixed-length shear control system, and the billet flow number is uploaded to the industrial internet platform through the PLC control system, and the industrial internet platform issues the adjusted length of the billet; 4) data conversion between the continuous casting primary control system and the industrial internet platform; and 5) length adjustment control of the continuous casting billet. The present application realizes automatic adjustment of the length of the billet, thereby improving the weight accuracy of the billet, reducing or eliminating short-length materials during rolling, and improving the rolling yield.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of continuous casting and rolling production shear control, and particularly relates to a control method for calculating the fixed weight of a billet based on non-fixed length of a bar. BACKGROUND

[0002] The traditional length of a billet is controlled according to the weight of the billet after continuous casting, and the billet is segmented and cut according to the fixed length of the billet, and then is rolled after cutting. The cold billet is identified according to the image of the loading rack of the heating furnace, and the material identification process of the cold billet is realized through a billet material information input system, a bar continuous rolling area steel material information tracking system and a finishing cold bed area material information tracking system.

[0003] During the movement forming process of the continuous casting billet, the unit weight changes over time due to the change of the pulling speed, the change of the molten steel temperature, the change of the cooling condition and the change of the mold wear, especially the pulling speed has a greater impact on the density of the billet, so that under the condition of a certain length, the weight deviation fluctuates by more than 10 kg. After the billet is rolled by the steel rolling, the length of the steel changes greatly, and the tail cannot meet the fixed length requirement and is cut off or counted as non-fixed length material, causing great waste and loss of economic benefits, so the current billet segmentation cutting system with fixed length has the defect of large weight error.

[0004] The cold billet rolling consumes a large amount of energy, and with the improvement of process technology, the hot charging of the billet and the direct rolling process of the billet are generated. However, due to the inaccuracy of the billet flow number, the change of the heating furnace oxidation loss, the change of the material type control of the rolling line, and the change of the shearing standard of each flying shear, the total length of the bar changes greatly, the double-length length of the rolled piece cannot be accurately tracked, and the rolling line PLC cannot accurately feedback to the continuous casting, so the continuous casting cannot accurately respond in time. Due to the different lengths of the rolled steel production, the weight requirement of the billet is higher than the standard, and only relying on the single control of the continuous casting billet weight is easy to cause the production of the rolling line full-length material, which reduces the profit. Therefore, it is urgent to design a control method for calculating the fixed weight of the billet based on the non-fixed length of the bar to solve the problems of inaccurate billet flow number tracking and poor billet double-length shear length control precision, which causes the waste of the billet. SUMMARY

[0005] In view of the problems in the prior art, the purpose of the present application is to provide a control method for calculating the fixed weight of a billet based on the non-fixed length of a bar.

[0006] The technical scheme adopted by the present application to solve its technical problems is: a control method for calculating the fixed weight of a billet based on the non-fixed length of a bar, comprising the following steps:

[0007] 1) Billet tracking in the process of hot charging and direct rolling

[0008] ①Virtual position trigger: In hot delivery or straight rolling state, a virtual billet position and trigger condition are set in the heating furnace billet flow number tracking system to determine the equipment action signal of each virtual billet position,

[0009] ②Flow number transmission: When the continuous production billet is cut, the predetermined billet delivery is carried out according to the FIFO principle,

[0010] ③After the billet enters the rolling line, the cold billet signal tracking technology is consistent;

[0011] 2) Calculation method based on non-regular length of bar: the tail length is calculated, and the remaining length value after the tail is cut to the regular length is transmitted to the continuous casting weighing control system through the industrial internet platform. The continuous casting weighing control system converts the remaining length value into the billet length that needs to be adjusted;

[0012] 3) The remaining length and billet flow number after the last regular length of the rolling line multiple shear control system is cut are uploaded to the industrial internet platform through the PLC control system. The industrial internet platform issues the billet adjustment length;

[0013] 4) Data conversion between the continuous casting primary control system and the industrial internet platform. The continuous casting primary control system transmits the billet length to the industrial internet platform. The industrial internet platform converts the billet length into the billet weight G0 that needs to be adjusted by continuous casting through an algorithm. The industrial internet platform issues G0 to the continuous casting weighing control system;

[0014] 5) Continuous casting billet length adjustment control. The continuous casting weighing control system obtains the original flow number billet weight G. When the industrial internet platform issues the flow number billet adjustment amount G0, the continuous casting weighing control system issues the original flow number billet weight G-G0 to the current executed billet weight calculation system to execute a new round of weight design basis.

[0015] Specifically, the virtual position trigger process in step ①: the predetermined positions of the billet on the steelmaking conveying roller are position 1 and position 2, that is, the billet is cut by the fire cutting machine when the billet is at position 0, the billet is conveyed backward after cutting, and the billet waits when it reaches the 1# baffle. When the waiting billet is rejected due to long waiting time, as long as the flow is not predetermined and the 1# baffle is lowered, the flow is turned up.

[0016] Specifically, the trigger condition in step ① is that the position 0 in the heating furnace billet flow number tracking system: fire cutting machine clamping trigger; position 1: cutting end limit trigger; position 2: laser limit trigger at lifting baffle 1; position 3: billet tail leaves baffle 1 laser limit after 3s delay trigger; position 4: billet turning up limit trigger when there is billet at position 3; position 5: straight rolling mode, trigger after 18s counting when there is billet at position 3; position 6: trigger after 10s counting when there is billet at position 5.

[0017] Specifically, in the flow number transmission mode in step ②, when the continuously produced billets are cut, the cutting end position of the fire cutting machine is used as a trigger stack storage signal, the billet cut first is stored in the stack first, the billet first stored in the stack is taken as a first-out signal and is waited for a predetermined time through PLC programming, and in the single production line and double production line billet feeding mode, the billets are fed according to the FIFO principle, so that the optimal hot feeding and direct rolling rate is ensured.

[0018] Specifically, the calculation formula based on the non-fixed length of the bar in step 2) is L1 / L2=N.......L3.

[0019] L1: the last multiple length, unit: mm;

[0020] L2: the set finished product fixed length, unit: mm;

[0021] N: the number of fixed length sections that can be cut for the last multiple, unit: section;

[0022] L3: the remaining length after cutting the fixed length of the last multiple, unit: mm;

[0023] The calculation formula of the billet length that needs to be adjusted in continuous casting is as follows:

[0024] L4=L3*πr² / l 2

[0025] L4: the billet length that needs to be adjusted in continuous casting, unit: mm;

[0026] L3: the remaining length after cutting the fixed length of the last multiple, unit: mm;

[0027] r: the radius of the finished product, unit: mm;

[0028] l: the side length of the square billet, unit: mm.

[0029] Specifically, in step 3), the industrial internet platform adjusts the billet length to the continuous casting weighing control system, the continuous casting weighing control system compares the billet length adjustment with historical data, calculates the next billet parameter control model, and transmits the model to the continuous casting primary control system, and the billet length is automatically adjusted.

[0030] Specifically, in step 4), the calculation formula of the billet weight G0 that needs to be adjusted in continuous casting is G0=L4*l 2 * the billet density p.

[0031] Specifically, the continuous casting billet length adjustment control process in the step 5) is: the continuous casting billet weight intelligent control cutting overall system comprises a withdrawal straightener speed detection system, a flame cutting system, a billet weight weighing system and a billet weight calculation system, the withdrawal straightener speed detection system is in communication connection with the billet weight calculation system, the instantaneous rotating speed v of the withdrawal straightener is sent to the billet weight calculation system, the billet weight G = billet running average speed V * crystallizer bottom area (length * width) * time * billet density p, when the required weight is reached, the flame cutting system is triggered to follow the cutting of the billet, and the billet weight weighing system weighs the cut billet and sends the feedback result to the billet weight calculation system.

[0032] The present application has the following beneficial effects:

[0033] The control method for calculating the fixed weight of the billet based on the non-fixed size of the bar adopts the multi-point positioning signal flow billet tracking and the multiple-length cutting overall system of the weighing conversion into the cutting length, realizes the automatic adjustment of the billet length, and thus improves the accuracy of the billet fixed weight, reduces or eliminates the short-length material, and improves the rolling yield. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 It is a flow chart of billet tracking.

[0035] Figure 2 It is a structural schematic diagram of a billet flow number transmission mode.

[0036] Figure 3 It is a structural block diagram of a continuous casting billet weight intelligent control cutting overall system. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be further and clearly and completely explained in combination with the drawings. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0038] A control method for calculating the fixed weight of the billet based on the non-fixed size of the bar, taking a square billet with a square side length of 165 mm as an example, specifically comprising the following steps:

[0039] I. Billet tracking technology in the process of hot charging and straight rolling

[0040] 1. Virtual position trigger process: Set virtual billet position and trigger condition in the billet flow tracking system of the heating furnace, so as to determine the equipment action signal of each virtual billet position. In the hot charging or straight rolling state, the billet can be predetermined at positions 1 and 2 on the steelmaking conveying roller. When the billet is at position 0, the fire cutting machine is cutting. After the billet is cut, it is conveyed backward and waits when the billet reaches the front of the 1# baffle. When the waiting billet is rejected due to long waiting time, as long as the flow is not predetermined and the 1# baffle is lowered, the flow is offline and the turnover can be completely avoided. The simultaneous predetermination of two similar billets causes the condition of double billets in parallel on the rolling side. The trigger condition corresponding to the virtual billet position is shown in the following table:

[0041] Virtual billet position Trigger condition Position 0 Fire shear clamping trigger Position 1 Cutting end limit trigger Position 2 Laser limit trigger at lift baffle 1 Position 3 Billet tail leaves baffle 1 laser limit, 3s delay trigger Position 4 Tilting shear up limit trigger when there is billet at position 3 Position 5 Straight rolling mode, trigger after 18s when there is billet at position 3 Position 6 Trigger after 10s when there is billet at position 5

[0042] As shown in Figure 2 , when position 0 is triggered, the equipment signal is the fire cutting machine clamping, and the fire cutting machine is cutting; when position 1 is triggered, the equipment signal is the cutting end limit trigger, and the post-cutting roller is conveying; when position 2 is triggered, the equipment signal is the laser at the 1# baffle, and the billet is waiting at the 1# baffle; when position 3 is triggered, the equipment signal is the laser limit trigger at the 2# lifting baffle, and the billet enters the large roller; when position 4 is triggered, the equipment signal is the limit of the billet at position 3 when the turnover machine is turned up, and the turnover machine is turned up to the slide rail; when position 5 is triggered, the equipment signal is the hot charging and straight rolling mode; the flow is predetermined, the 2# baffle is lowered, and the billet is being conveyed above the 2# baffle.

[0043] 2. Flow number transmission mode: When the billet is cut in continuous production, the fire cutting machine cutting end point is used as the trigger stack storage signal, and the first cut-off billet is stored in the stack first. Through PLC programming, the first-in stack billet is used as the first-out signal to wait for predetermination. In single production line and double production line billet feeding mode, the billet is predetermined according to the FIFO (First In First Out) principle, which provides guarantee for the optimal hot charging and straight rolling rate.

[0044] As shown in Figures 1-2 , the method of billet flow number transmission mode:

[0045] 1) After the predetermined billet reaches the laser limit at the end of the large roller, the position 3 signal is triggered and connected.

[0046] 2) The 2# baffle is not in the upper limit, that is, the 2# baffle is lowered, which meets the billet feeding condition.

[0047] 3) After the first two conditions are met, the trigger is connected with a delay of 1s, that is, the conveying signal starts after 1s.

[0048] 4) After the first three conditions are met, the billet number and flow number are transmitted to the address of the rolling 1st stage.

[0049] 5) When the delivered billet is transmitted to the first hot check of the rolling mill roller, the rolling feedback hot check signal is transmitted, and the cached billet number and flow number are reset to empty and 0, preventing repeated transmission of the same information. Thus, the delivery of one billet is completed, and the subsequent billet repeats the procedure.

[0050] II. Calculation method based on non-fixed length of bar

[0051] By calculating the tail length and transmitting the remaining length value after cutting the fixed length to the continuous casting through the industrial internet platform, the continuous casting system converts the remaining length value into the length of the billet that needs to be adjusted, thereby improving the accuracy of the billet weight, reducing or eliminating short rolled materials, and improving the rolling yield.

[0052] The calculation formula based on the non-fixed length of the bar is: L1 / L2=N.......L3

[0053] Wherein, L1: the length of the last double-length, unit: mm;

[0054] L2: the set fixed length of the finished product, unit: mm;

[0055] N: the number of fixed length sections that can be cut for the last double-length, unit: section;

[0056] L3: the remaining length after cutting the last double-length to the fixed length, unit: mm;

[0057] The calculation formula of the billet length that needs to be adjusted by continuous casting is as follows:

[0058] L4=L3*πr² / 165 2

[0059] Wherein, L4: the billet length that needs to be adjusted by continuous casting, unit: mm;

[0060] L3: the remaining length after cutting the last double-length to the fixed length, unit: mm;

[0061] r: the radius of the finished rolling piece, unit: mm;

[0062] The square billet side length is 165mm.

[0063] III. The last double-length remaining length after cutting the last double-length to the fixed length and the billet flow number are uploaded to the industrial internet platform through the PLC control system of the rolling line double-length cutting control system, the industrial internet platform adjusts the billet length to the continuous casting weighing control system, the continuous casting weighing control system compares the billet length adjustment length with the historical data, calculates the next billet parameter control model to the continuous casting first-level control system, and the billet length is automatically adjusted.

[0064] Four, the data conversion of the continuous casting first control system and the industrial internet platform, the continuous casting first control system transmits the billet length to the industrial internet platform, and the industrial internet platform converts the billet length into the billet weight G0 that needs to be adjusted by the continuous casting through an algorithm, G0=L4*l 2 The billet density ρ, the industrial internet platform sends G0 to the continuous casting weighing control system, and in the automatic state of the steelmaking first PLC, the system can control the billet length according to the adjustment amount G0 sent by the internet platform.

[0065] Five, the continuous casting billet length adjustment control process

[0066] The continuous casting billet weight intelligent control cutting overall system includes a speed detection system of a straightening and correcting machine, a flame cutting system, a billet weight weighing system and a billet weight calculation system, the speed detection system of the straightening and correcting machine is in communication connection with the billet weight calculation system, the instantaneous rotating speed v of the straightening and correcting machine is sent to the billet weight calculation system, the billet weight G is equal to the average running speed V of the billet * the bottom area (length * width) of the crystallizer * time * the billet density ρ, when the required weight is reached, the flame cutting system is triggered to follow the cutting of the billet, and the billet weight weighing system weighs the cut billet and sends the feedback result to the billet weight calculation system.

[0067] When the industrial internet platform sends the billet adjustment amount G0 of the flow number, the continuous casting weighing control system sends the original billet weight G-G0 of the flow number to the billet weight calculation system currently executed, and executes a new round of weight design basis.

[0068] The present application reduces or eliminates the rolling short material, improves the rolling yield, and improves the yield by 0.1%, reduces the short material by 0.5kg, according to the daily output of 4800 tons, the tonnage of single consumption is 2600 yuan, the billet cost is saved about 205.92 million yuan per year (330 days) per line, and the present application has been popularized in other production lines.

[0069] The present application is not limited to the above-mentioned embodiments, and any person should know that the structural changes made under the inspiration of the present application fall within the protection scope of the present application.

[0070] The technical, shape and structure parts not described in detail in the present application are all known technologies.

Claims

1. A method for controlling the weight of steel billets based on non-standard length calculation of bar stock, characterized in that, Includes the following steps: 1) Billet tracking during hot charging and direct rolling processes ① Virtual position triggering: Under hot conveying or direct rolling conditions, the billet flow tracking system of the heating furnace sets virtual billet positions and triggering conditions to determine the equipment action signals for each virtual billet position; Virtual position triggering process: The billet can be pre-defined at positions 1 and 2 on the steelmaking conveyor rollers, that is, the billet is cut by the fire cutter at position 0, and after the billet is cut, it is conveyed backward and waits before the #1 baffle. When the waiting billet is rejected due to long waiting time, as long as this flow has not been pre-defined and 1 #When the baffle descends, the current flow will flip up; the trigger conditions are: Position 0 in the heating furnace billet flow tracking system: clamping of the fire-cutting machine; Position 1: cutting end limit trigger; Position 2: laser limit at lifting baffle 1; Position 3: 3s delay after the billet tail leaves the laser limit at baffle 1; Position 4: flipping limit at position 3 when there is a billet; Position 5: in direct rolling mode, 18s count after the start of counting at position 3 when there is a billet; Position 6: 10s count after the start of timing at position 5 when there is a billet. ② Flow number transmission: When cutting steel billets in continuous production, the billet is pre-fed according to the FIFO principle; ③ After the steel billet enters the rolling line, the signal tracking technology is consistent with that of the cold billet; 2) Calculation method based on non-fixed length of bar stock: The length of the tail section is calculated, and the remaining length value after the tail section is cut to a fixed length is transmitted to the continuous casting weighing control system through the industrial Internet platform. The continuous casting weighing control system converts the remaining length value into the billet length that needs to be adjusted. The formula for calculating the non-standard length of bar stock is: L1 / L2 = N.......L3 Where L1: the length of the last multiple ruler, in mm; L2: The set length of the finished product, in mm; N: The number of standard length segments that can be cut from the last double-length gauge, in segments; L3: The remaining length after the last double-length ruler is cut to the specified length, in mm; The formula for calculating the billet length that needs to be adjusted in continuous casting is as follows: L4=L3*πr² / l 2 Wherein, L4: the billet length that needs to be adjusted in continuous casting, in mm; L3: The remaining length after the last double-length ruler is cut to the specified length, in mm; r: Radius of the finished rolled part, in mm; l: Side length of the billet, unit: mm; 3) The rolling mill multiple length shearing control system uploads the remaining length and billet serial number after the last multiple length is cut to the specified length to the industrial internet platform via the PLC control system. The industrial internet platform then issues a billet length adjustment order. 4) Data conversion between the continuous casting primary control system and the industrial internet platform: The continuous casting primary control system transmits the billet length to the industrial internet platform. The industrial internet platform uses algorithms to convert the billet length into the billet weight G0 that needs to be adjusted in continuous casting. The industrial internet platform then sends G0 to the continuous casting weighing control system. 5) Continuous casting billet length adjustment control: The continuous casting weighing control system obtains the original billet weight G. When the industrial internet platform issues the adjustment amount G0 for the billet of the original billet weight, the continuous casting weighing control system will issue the original billet weight G-G0 to the currently executing billet weight calculation system to implement a new round of weight design basis.

2. The control method for calculating the fixed weight of steel billets based on non-standard length calculation of bar stock according to claim 1, characterized in that, In step ②, the flow number transmission method is to use the end point of the cutting machine as the trigger stack entry signal when the steel billet is cut during continuous production. The steel billet that is cut first is stored in the stack. The first steel billet in the stack is used as the first exit signal by PLC programming to wait for the scheduled delivery. In the single production line and dual production line billet delivery mode, the scheduled delivery of billets is carried out according to the FIFO principle to ensure the optimal hot delivery direct rolling rate.

3. The control method for calculating the fixed weight of steel billets based on non-standard length calculation of bar stock according to claim 1, characterized in that, In step 3), the industrial internet platform adjusts the billet length to the continuous casting weighing control system. The continuous casting weighing control system compares the adjusted billet length with historical data, calculates the parameter control model for the next billet, and sends it to the first-level control system of continuous casting, so that the billet length is automatically adjusted.

4. The method for controlling the weight of steel billets based on non-standard length calculation of bar stock according to claim 1, characterized in that, The formula for calculating the billet weight G0 that needs to be adjusted in continuous casting in step 4) is G0 = L4 * l 2 *Steel billet density ρ.

5. The method for controlling the weight of steel billets based on non-standard length calculation of bar stock according to claim 1, characterized in that, The continuous casting billet length adjustment control process in step 5) is as follows: The intelligent control and cutting system for continuous casting billet weight includes a straightening machine speed detection system, a flame cutting system, a billet weight weighing system, and a billet weight calculation system. The straightening machine speed detection system establishes a communication connection with the billet weight calculation system, sending the instantaneous rotation speed v of the straightening machine to the billet weight calculation system. The billet weight G = average running speed of the billet V * bottom area of ​​the crystallizer * time * billet density ρ. When the required weight is reached, the flame cutting system is triggered to follow and cut the billet. The billet weight weighing system weighs the cut billet and sends the feedback result to the billet weight calculation system.

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