Energy-saving process method for large-rod continuous rolling unit

Abstract

The invention discloses an energy-saving process method for a large-rod continuous rolling unit. The energy-saving process method comprises the following steps that a hot detection device recognizes a rolled blank; the continuous rolling unit control system converts the detected blank information into an electrical switch signal; transmitting to the PLC; the PLC compiles an automatic logic control program; method for judging whether continuous rolling unit has no torque signal and steel throwing is completed or not If yes, the continuous rolling unit is automatically controlled to stop; if not, the continuous rolling unit continues rolling. By the adoption of the technical scheme, the bar position is accurately tracked through existing detection equipment and rolling mill motor torque, starting and stopping of the continuous rolling unit are regulated and controlled according to the actual blank position, the running time of the continuous rolling unit is shortened, and production efficiency is improved; waste of electric energy in production is reduced, and the effects of energy conservation and emission reduction are achieved; and meanwhile, the service life of equipment is prolonged.

Description

Technical Field

[0001] This invention belongs to the technical field of steel industry production control engineering. More specifically, this invention relates to an energy-saving process method for a continuous bar rolling mill. Background Technology

[0002] The processing of large bars incurs high electricity costs. To reduce these costs, it is necessary to thoroughly investigate energy waste in the production process. Research has found that the slow production pace of continuous rolling mills, leading to excessive idling and waiting times, is the primary cause of energy waste. Continuous rolling mills typically operate at higher speeds than billet mills, requiring them to idle before the billet mill completes its rolling. On average, each steel bar waits approximately 12 minutes, resulting in significant electricity waste. Furthermore, the prolonged ineffective operating time also reduces the equipment's lifespan.

[0003] Using keywords such as "continuous rolling; steel; bar; unit; energy saving," a search was conducted on existing publicly available technical documents, yielding the following results:

[0004] 1. Chinese patent document: "A continuous casting and rolling production line for wire rods", patent (application) number: 201920114294.9; the technical solution described therein is:

[0005] "The wire rod continuous casting and rolling production line includes a continuous casting machine, a roller conveyor system, a temperature compensation system, and a wire rod rolling system. This production line can quickly and concurrently transfer the billets produced by the multi-strand continuous casting machine to the wire rod rolling system. It uses a small-footprint induction heating device to compensate for the online temperature loss and head-to-tail temperature difference of the billets. By combining the concurrent roller conveyor with the temperature compensation system, it can reduce and eliminate the transverse and longitudinal temperature difference of the billets while reducing energy consumption and production costs, thereby improving the performance of wire rod products and increasing the direct rolling rate when producing products of different specifications."

[0006] The technical effects described are:

[0007] "The continuous casting and rolling production line can expand to high-quality carbon structural steel, alloy steel and other special steels. It has high energy efficiency, is energy-saving and environmentally friendly, and the quality of wire rod products is guaranteed."

[0008] 2. Chinese patent document: "High-efficiency and energy-saving synchronous continuous rolling mill", patent (application) number: 200820014372.X; the technical solution described therein is:

[0009] "The high-efficiency and energy-saving synchronous continuous rolling mill multi-running mill is a motor that is connected to multiple sets of combined reducers through multiple pulleys and V-belts on the main shaft. One end of the universal drive shaft is connected to the output shaft of the combined reducer, and the other end of the universal drive shaft is connected to the rolling rolls. It can form a three-running mill with one set of four rolls for one billet, a five-running mill with two sets of four rolls for one billet, a seven-running mill with three sets of four rolls for one billet, and a nine-running mill with four sets of four rolls for one billet, which can realize synchronous and continuous rolling of steel."

[0010] The technical effects described are:

[0011] "It features a simple structure, convenient installation, energy saving, and low investment, which can save more than 50% of power and reduce labor by more than 50%."

[0012] However, the technical solutions recorded in the aforementioned technical documents, as well as the existing publicly available technical solutions, have not been able to solve the problems and defects in the existing technology, such as "low production efficiency", "increased energy consumption" and "reduced equipment lifespan". Summary of the Invention

[0013] This invention provides an energy-saving process method for a continuous bar rolling mill, the purpose of which is to shorten the operating time of the continuous rolling mill.

[0014] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0015] The energy-saving process method for a continuous bar rolling mill of the present invention includes the following steps:

[0016] Step 1: Rolling on the billet mill is completed;

[0017] Step 2: The thermal inspection device identifies the rolled billet;

[0018] Step 3: The continuous rolling mill control system converts the detected billet information into electrical switching signals;

[0019] Step 4: Transmit to PLC;

[0020] Step 5: Write the automatic logic control program for the PLC;

[0021] Step 6: Determine if the continuous rolling mill has no torque signal and the steel ejection is complete. If yes, proceed to step 8; otherwise, proceed to the next step.

[0022] Step 7: The continuous rolling mill continues rolling, and then returns to the previous step;

[0023] Step 8: Automatically control the continuous rolling mill to stop;

[0024] Step 9: Energy-saving objective achieved;

[0025] Finish.

[0026] The aforementioned hot metal detector is installed in front of the continuous rolling mill. After the billet is rolled by the billet mill, the hot metal detector identifies the rolled billet.

[0027] The hot metal detector detects the position, running speed, temperature, and attitude information of the rolled billet.

[0028] The process method accurately tracks the information of the rolled billet by detecting the equipment and the torque of the rolling mill motor; and adjusts the start and stop of the continuous rolling mill according to the actual position of the rolled billet to shorten the running time of the continuous rolling mill.

[0029] Before the billet is about to enter the continuous rolling mill, the continuous rolling mill accelerates from a stationary state to the rolling speed for rolling.

[0030] In steps 2 to 4, the continuous rolling mill identifies the rolled billet through a thermal detection device and converts the information of the rolled billet into electrical switching signals, which are then transmitted to the PLC. The continuous rolling mill is then automatically started according to a pre-programmed automatic logic control program.

[0031] In step 5, a PLC rolling tracking program is independently developed, utilizing the PLC's powerful logic operation capabilities and mature programming concepts to form a general and mature program module for use in the functional requirements of similar rolling processes.

[0032] In step 6, when the continuous rolling mill has no torque signal and the steel ejection is completed, the control program determines that rolling has ended and automatically controls the continuous rolling mill to stop, thereby achieving the purpose of saving electricity.

[0033] The continuous rolling mill unit generates signals through relevant electrical components, which are then input to a Siemens S7-300 / S7-400 PLC for logic judgment.

[0034] After the continuous rolling mill calculates the position of the billet through a program, it issues DC speed control commands and speed commands, which are then transmitted to the corresponding DC speed control drive cabinet via the PROFIBUS network to drive the equipment.

[0035] The present invention adopts the above-mentioned technical solution, which uses existing detection equipment and rolling mill motor torque to accurately track the position of the bar, and adjusts the start and stop of the continuous rolling mill according to the actual position of the billet, so as to shorten the running time of the continuous rolling mill and improve production efficiency; reduce the waste of electrical energy in production, play a role in energy conservation and emission reduction; and extend the service life of the equipment. Attached Figure Description

[0036] The following is a brief description of the content shown in the attached diagram:

[0037] Figure 1 This is a logical flow diagram of the process method of the present invention. Detailed Implementation

[0038] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, so as to help those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention.

[0039] like Figure 1 The technical solution of the present invention shown is an energy-saving process method for a bar continuous rolling mill; the present invention aims to solve the technical problem of energy-saving retrofitting of a bar continuous rolling mill using existing equipment.

[0040] In order to solve the problems and overcome the defects of the existing technology and achieve the invention objective of shortening the operating time of continuous rolling mills, the technical solution adopted by the present invention is as follows:

[0041] like Figure 1 As shown, the energy-saving process method for the continuous bar rolling mill of the present invention includes the following steps:

[0042] Step 1: Rolling on the billet mill is completed;

[0043] Step 2: The thermal inspection device identifies the rolled billet;

[0044] Step 3: The continuous rolling mill control system converts the detected billet information into electrical switching signals;

[0045] Step 4: Transmit to PLC;

[0046] Step 5: Write the automatic logic control program for the PLC;

[0047] Step 6: Determine if the continuous rolling mill has no torque signal and the steel ejection is complete. If yes, proceed to step 8; otherwise, proceed to the next step.

[0048] Step 7: The continuous rolling mill continues rolling, and then returns to the previous step;

[0049] Step 8: Automatically control the continuous rolling mill to stop;

[0050] Step 9: Energy-saving objective achieved;

[0051] Finish.

[0052] Before the billet enters the continuous rolling mill, the continuous rolling mill accelerates from a stationary state to the rolling speed for rolling. The signals generated by the relevant electrical components are input to the PLC for logic judgment. After the program calculates the position of the billet, it issues DC speed control commands and speed commands, which are transmitted to the corresponding DC speed control drive cabinet through the PROFIBUS network to drive the equipment.

[0053] This invention identifies the rolled billet through thermal detection and converts it into electrical switching signals, which are then transmitted to a PLC. An automatic logic control program is written to control the automatic start-up of the continuous rolling mill. By independently developing a PLC rolling tracking program, leveraging the PLC's powerful logic processing capabilities and mature programming concepts, a general and mature program module is formed for use in similar functional requirements.

[0054] Compared with the prior art, the present invention has the following obvious advantages:

[0055] 1. It reduces the waste of electricity in production, thus playing a role in energy conservation and emission reduction;

[0056] 2. Utilize existing equipment functions and integrate them through PLC logic programs to achieve zero-cost retrofitting;

[0057] 3. Significantly reduces the ineffective operating time of the equipment and extends the service life of the equipment, including the continuous rolling DC motor and reducer.

[0058] The aforementioned hot metal detector is installed in front of the continuous rolling mill. After the billet is rolled by the billet mill, the hot metal detector identifies the rolled billet.

[0059] The hot metal detector detects the position, running speed, temperature, and attitude information of the rolled billet.

[0060] A hot metal detector is installed in front of the continuous rolling mill. After the billet is rolled, the hot metal detector identifies the rolled billet and converts it into an electrical switching signal, which is then transmitted to the PLC. An automatic logic control program is written to control the automatic start of the continuous rolling mill. When there is no torque signal from the continuous rolling mill and the steel ejection is completed, the program determines that rolling has ended and automatically controls the continuous rolling mill to stop, thus achieving energy saving.

[0061] The process method accurately tracks the information of the rolled billet by detecting the equipment and the torque of the rolling mill motor; and adjusts the start and stop of the continuous rolling mill according to the actual position of the rolled billet to shorten the running time of the continuous rolling mill.

[0062] Before the billet is about to enter the continuous rolling mill, the continuous rolling mill accelerates from a stationary state to the rolling speed for rolling.

[0063] In steps 2 to 4, the continuous rolling mill identifies the rolled billet through a thermal detection device and converts the information of the rolled billet into electrical switching signals, which are then transmitted to the PLC. The continuous rolling mill is then automatically started according to a pre-programmed automatic logic control program.

[0064] In step 5, a PLC rolling tracking program is independently developed, utilizing the PLC's powerful logic operation capabilities and mature programming concepts to form a general and mature program module for use in the functional requirements of similar rolling processes.

[0065] In step 6, when the continuous rolling mill has no torque signal and the steel ejection is completed, the control program determines that rolling has ended and automatically controls the continuous rolling mill to stop, thereby achieving the purpose of saving electricity.

[0066] The continuous rolling mill unit generates signals through relevant electrical components, which are then input to a Siemens S7-300 / S7-400 PLC for logic judgment.

[0067] After the continuous rolling mill calculates the position of the billet through a program, it issues DC speed control commands and speed commands, which are then transmitted to the corresponding DC speed control drive cabinet via the PROFIBUS network to drive the equipment.

[0068] In summary, the technical effects and innovations of this invention are as follows:

[0069] 1. The high-efficiency and energy-saving process method for continuous rolling mills of steel bars of the present invention utilizes existing detection equipment and rolling mill motor torque to accurately track the position of the bars, and adjusts the start and stop of the continuous rolling mill based on the actual position of the billet, thereby shortening the running time of the continuous rolling mill. This method significantly achieves energy saving and emission reduction effects;

[0070] 2. Utilize existing equipment to accurately detect and track the position of the billet; before the billet is about to enter the continuous rolling mill, the continuous rolling mill accelerates from a stationary state to the rolling speed for rolling;

[0071] 3. The signals generated by the relevant electrical components are input to the Siemens S7-300 / S7-400 PLC for logic judgment; after the program calculates the position of the blank, it issues DC speed control commands and speed commands, and transmits them to the corresponding DC speed control drive cabinet through the PROFIBUS network to drive the equipment.

[0072] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, are all within the protection scope of the present invention.

Claims

1. An energy-saving process method for a continuous bar rolling mill, characterized in that: The process includes the following steps: Step 1: Rolling on the billet mill is completed; Step 2: The thermal inspection device identifies the rolled billet; Step 3: The continuous rolling mill control system converts the detected billet information into electrical switching signals; Step 4: Transmit to PLC; Step 5: Write the automatic logic control program for the PLC; Step 6: Determine if the continuous rolling mill has no torque signal and the steel ejection is complete. If yes, proceed to step 8; otherwise, proceed to the next step. Step 7: The continuous rolling mill continues rolling, and then returns to the previous step; Step 8: Automatically control the continuous rolling mill to stop; Step 9: Energy-saving objective achieved; Finish.

2. The energy-saving process method for a continuous bar rolling mill according to claim 1, characterized in that: The aforementioned hot metal detector is installed in front of the continuous rolling mill. After the billet is rolled by the billet mill, the hot metal detector identifies the rolled billet.

3. The energy-saving process method for a continuous bar rolling mill according to claim 2, characterized in that: The hot metal detector detects the position, running speed, temperature, and attitude information of the rolled billet.

4. The energy-saving process method for a continuous bar rolling mill according to claim 1, characterized in that: The process method accurately tracks the information of the rolled billet by detecting the equipment and the torque of the rolling mill motor; and adjusts the start and stop of the continuous rolling mill according to the actual position of the rolled billet to shorten the running time of the continuous rolling mill.

5. The energy-saving process method for a continuous bar rolling mill according to claim 1, characterized in that: Before the billet is about to enter the continuous rolling mill, the continuous rolling mill accelerates from a stationary state to the rolling speed for rolling.

6. The energy-saving process method for a continuous bar rolling mill according to claim 1, characterized in that: In steps 2 to 4, the continuous rolling mill identifies the rolled billet through a thermal detection device and converts the information of the rolled billet into electrical switching signals, which are then transmitted to the PLC. The continuous rolling mill is then automatically started according to a pre-programmed automatic logic control program.

7. The energy-saving process method for a continuous bar rolling mill according to claim 1, characterized in that: In step 5, a PLC rolling tracking program is independently developed, utilizing the PLC's powerful logic operation capabilities and mature programming concepts to form a general and mature program module for use in the functional requirements of similar rolling processes.

8. The energy-saving process method for a continuous bar rolling mill according to claim 1, characterized in that: In step 6, when the continuous rolling mill has no torque signal and the steel ejection is completed, the control program determines that rolling has ended and automatically controls the continuous rolling mill to stop, thereby achieving the purpose of saving electricity.

9. The energy-saving process method for a continuous bar rolling mill according to claim 1, characterized in that: The continuous rolling mill unit generates signals through relevant electrical components, which are then input to a Siemens S7-300 / S7-400 PLC for logic judgment.

10. The energy-saving process method for a continuous bar rolling mill according to claim 1, characterized in that: After the continuous rolling mill calculates the position of the billet through a program, it issues DC speed control commands and speed commands, which are then transmitted to the corresponding DC speed control drive cabinet via the PROFIBUS network to drive the equipment.

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