A hot charging control method for improving the automatic control of the charging rhythm of the steel rolling into the furnace

Abstract

The application discloses a hot charging control method for improving automatic control of charging rhythm of a rolling mill with increased charging temperature, and belongs to the technical field of steel production, and solves the technical problem of excessively large reduction of red steel temperature caused by loose interlocking of a feeding system, and the method is as follows: collecting a billet signal of a hot charging roller way, a lifting chain and a charging weighing roller way; detecting the temperature of the billets at the charging opening of the hot charging roller way and the charging weighing roller way; generating a hot charging roller way starting signal and a hot charging roller way stopping signal by using the billet signal of the hot charging roller way; triggering a billet pushing action of a billet pusher by using a billet-free signal of a lifting chain groove; when the charging weighing roller way is billet-free and the billet pusher is capable of advancing, the lifting chain automatically advances to lift the billet; when the charging weighing roller way detects a billet signal, a weighing device performs a weighing action; a rolling mill PLC sends a rolling specification and a billet signal of a first stand of a rolling mill to a rolling steel heating furnace PLC; and the rolling steel heating furnace PLC sends a billet signal to a steelmaking continuous casting.

Description

Technical Field

[0001] This invention relates to the field of steel production technology, and more specifically, to a hot-feeding control method for automatically controlling the feeding rhythm of steel to improve the furnace temperature. Background Technology

[0002] The steel rolling mill's feeding system comprises four control systems: hot conveyor rollers, pusher, lifting chain, and furnace weighing rollers. The steel billet travels from continuous casting to the hot conveyor rollers in the rolling mill, passing through only one and a half rollers. The hot conveyor rollers, pusher, lifting chain, and furnace weighing rollers complete the hot feeding process to the heating furnace. The short distance between the billet in the continuous casting and furnace feed, coupled with limited storage and turnover space, and the conversion of multiple billet transport to single billet transport between the pusher and lifting chain, results in inconsistent control attributes between the equipment before feeding. This makes it difficult to achieve tight interlocking between the equipment, hindering fully automatic interlocking. The automatic control logic of the furnace-front rollers is designed as sequential logic control. The hot conveyor section 0 also suffers from synchronization issues with the steelmaking speed. Steel loading is divided into several steps, with each subsequent step requiring the previous one, and each step involves complex interlocking. This reliance on the accuracy of sensors at each position in front of the furnace leads to low fault tolerance; manual intervention sometimes results in timing control errors when restoring automatic operation. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to address the above-mentioned shortcomings of the prior art. The purpose of the present invention is to provide a hot delivery control method for automatically controlling the feeding rhythm of steel entering the furnace to improve the temperature of steel rolling.

[0004] The technical solution of this invention is: a hot-feeding control method for improving the automatic control of steel feeding rhythm at the furnace temperature of rolled steel, the method being as follows:

[0005] Step 1. Tracking the steel billet signal in front of the furnace: Collect the billet signal from the hot conveyor rollers, the lifting chain, and the weighing rollers entering the furnace.

[0006] Step 2. Acquisition of billet temperature signals in front of the furnace: Temperature detection is performed on the billets at the inlet of the hot conveying roller conveyor and the weighing roller conveyor.

[0007] Step 3. Automatic control of the hot conveyor roller: using the billet signal of the hot conveyor roller obtained in Step 1, generate the hot conveyor roller start signal and the hot conveyor roller stop signal.

[0008] Step 4. Automatic control of the steel pusher: Using the no-bill signal of the lifting chain groove obtained in Step 1, the steel pusher is triggered to automatically push the billet forward. The steel pusher performs steel pushing operations in a group mode of multiple billets to meet the needs of different production rhythms.

[0009] Step 5. Automatic control of the lifting chain: When there is no steel billet on the weighing roller conveyor and the steel pusher is capable of forward movement, the lifting chain automatically moves forward to lift the steel.

[0010] Step 6. Automatic control of the furnace weighing roller conveyor: When the furnace weighing roller conveyor detects a signal that there is steel, the weighing device automatically rises to perform the weighing action. After rising and holding for a set time, it automatically descends to put the steel billet down onto the roller conveyor. The furnace weighing roller conveyor then automatically runs to load the steel.

[0011] Step 7. Data exchange between the heating furnace and the rolling line: the rolling line PLC sends the rolling specifications and the signal that the first stand of the rolling mill has steel to the heating furnace PLC.

[0012] Step 8. Data exchange between steelmaking and rolling: The PLC of the rolling heating furnace sends a steel demand signal to the steelmaking continuous casting, and the steelmaking continuous casting sends the steel billet to the designated steelmaking hot delivery section according to the steel demand signal.

[0013] As a further improvement, step one is divided into three stages. The first stage is when there is a steel billet on the hot conveying roller conveyor. Two hot metal detection sensors in the hot conveying roller conveyor area complete the collection of signals indicating that there is a steel billet in the area. After the conditions for automatic start are met, the hot conveying roller conveyor passes through the front end of section 1 of the hot conveying roller conveyor and the hot detection signal is delayed. It is determined that there is steel in section 1 of the hot conveying roller conveyor, and section 1 of the hot conveying roller conveyor automatically stops.

[0014] The second stage is when there is a steel billet in the groove of the lifting chain. After the conditions for automatic feeding are met, the steel pusher pushes the steel into place and a signal is generated to determine that there is steel in the groove. After the lifting chain moves a certain distance, it resets and determines that there is no steel in the groove.

[0015] The third stage is when there are steel billets on the weighing roller conveyor. The through-beam laser detection sensor in the weighing roller conveyor area collects the signal that there are steel billets in the area. When steel enters the weighing roller conveyor, when the tail of the steel passes through the hot inspection of the weighing roller conveyor, it is determined that there is no steel on the weighing roller conveyor and the weighing roller conveyor stops running automatically after a delay. At the same time, the furnace positioning is completed.

[0016] Furthermore, step two is divided into two stages. The first stage is the detection of billet temperature on the hot conveying roller conveyor. A hot metal detection sensor in the hot conveying roller conveyor area collects the billet signal and temperature signal in this area.

[0017] The second stage involves detecting the billet temperature at the furnace inlet of the weighing roller conveyor. A hot metal detection sensor is used to collect the billet signal and temperature signal in this area.

[0018] Furthermore, in step three, the hot conveying roller conveyor is divided into two sections: hot conveying roller conveyor section 0 and hot conveying roller conveyor section 1. Since the steel billet occupies 3 rollers of hot conveying section 1 on the rolling side after it arrives, these 3 rollers are separated and used as hot conveying section 0.

[0019] When the start signal of the hot conveyor roller changes from 0 to 1, the hot conveyor roller is automatically triggered to rotate forward, transporting the steel billets produced in the continuous casting workshop of the steelmaking plant from the hot conveyor roller to the pusher equipment area;

[0020] When the hot conveyor roller stop signal changes from 0 to 1, it automatically triggers the hot conveyor roller to stop rotating forward. Through the action of two successive control pulses, the hot conveyor roller start signal and the hot conveyor roller stop signal, the roller completes the transfer of steel billets in the area from movement to stop.

[0021] Furthermore, in step four, the steel pusher performs the steel pushing operation in groups of 3-6 steel billets.

[0022] Furthermore, in step five, the lifting chain for steel hoisting has two modes depending on the production rhythm: mid-level waiting and direct steel hoisting;

[0023] When the middle position is waiting, after the hot delivery section 1 stops, the steel pusher automatically pushes the steel. After the first steel billet falls into the groove, the lifting chain automatically lifts the steel billet to the middle position for waiting. When the second billet is lifted up, the first billet is sent to the furnace weighing roller table.

[0024] When direct steel lifting is adopted, after the hot conveying section 1 stops, the steel pusher automatically pushes the steel. After the steel billet falls into the groove, the furnace weighing roller is empty or the furnace weighing roller runs automatically. The lifting chain automatically lifts and sends the steel billet to the furnace weighing roller.

[0025] Furthermore, in step six, the time is set to 6-8 seconds. The automatic control for the forward movement of the steel loading is triggered by the steel loading signal required by the PLC of the steel rolling heating furnace. This signal is interlocked with the walking beam of the steel rolling heating furnace. The automatic steel loading is stopped by the pulse signal at the moment when the billet passes the last roller of the furnace weighing roller.

[0026] Furthermore, the hot conveyor rollers, lifting chains, and furnace weighing rollers are all equipped with both automatic and manual control modes. The automatic mode is selected during normal production, while the manual mode is selected in case of abnormalities. In the manual mode, bypass equipment linkage can be enabled, and equipment in each area can be controlled independently, allowing manual intervention to handle abnormal situations on site.

[0027] Beneficial effects

[0028] Compared with the prior art, the advantages of this invention are as follows:

[0029] This invention optimizes the furnace-front hot conveying equipment and connects the continuous casting and rolling mill lines under different production specifications using optimal logic control methods. With the core objective of improving furnace entry temperature and reducing energy consumption, the invention re-optimizes the complex interlocking control logic from the hot conveying roller conveyor to the furnace-entry weighing roller conveyor. This addresses the issues of the small spatial span of the billet from continuous casting to the furnace, the multiple steel conveyors involved in the transfer between the pusher and the lifting chain, and the rhythm of steel feeding. By adopting a fixed-point pusher and steel demand mode, the interlocking control between equipment is strengthened, resulting in a high temperature of the billet entering the furnace and a close connection with the rolling mill line, thus achieving the goal of energy conservation and consumption reduction. Attached Figure Description

[0030] Figure 1 This is a flowchart of the present invention. Detailed Implementation

[0031] The present invention will be further described below with reference to specific embodiments shown in the accompanying drawings.

[0032] See Figure 1 A hot-feeding control method for improving the automatic control of steel feeding rhythm at the furnace entry temperature of rolled steel, characterized in that the method is as follows:

[0033] Step 1. Tracking the steel billet signal in front of the furnace: Collect the billet signal from the hot conveyor rollers, the lifting chain, and the weighing rollers entering the furnace.

[0034] Step 2. Acquisition of billet temperature signals in front of the furnace: Temperature detection is performed on the billets at the inlet of the hot conveying roller conveyor and the weighing roller conveyor.

[0035] Step 3. Automatic control of the hot conveyor roller: using the billet signal of the hot conveyor roller obtained in Step 1, generate the hot conveyor roller start signal and the hot conveyor roller stop signal.

[0036] Step 4. Automatic control of the steel pusher: Using the no-bill signal of the lifting chain groove obtained in Step 1, the steel pusher is triggered to automatically push the billet forward. The steel pusher performs steel pushing operations in a group mode of multiple billets to meet the needs of different production rhythms.

[0037] Step 5. Automatic control of the lifting chain: When there is no steel billet on the weighing roller conveyor and the steel pusher is capable of forward movement, the lifting chain automatically moves forward to lift the steel.

[0038] Step 6. Automatic control of the furnace weighing roller conveyor: When the furnace weighing roller conveyor detects a signal that there is steel, the weighing device automatically rises to perform the weighing action. After rising and holding for a set time, it automatically descends to put the steel billet down onto the roller conveyor. The furnace weighing roller conveyor then automatically runs to load the steel.

[0039] Step 7. Data exchange between the heating furnace and the rolling line: the rolling line PLC sends the rolling specifications and the signal that the first stand of the rolling mill has steel to the heating furnace PLC.

[0040] Step 8. Data exchange between steelmaking and rolling: The PLC of the rolling heating furnace sends a steel demand signal to the steelmaking continuous casting, and the steelmaking continuous casting sends the steel billet to the designated steelmaking hot delivery section according to the steel demand signal.

[0041] Step 1 is divided into three stages. The first stage is when there is a steel billet on the hot conveyor roller. Two hot metal detection sensors in the hot conveyor roller area collect the signal of the presence of steel billet in the area. After the conditions for automatic start are met, the hot conveyor roller passes through the front end of the hot conveyor roller section 1 and the hot detection signal is delayed. It is determined that there is steel in the hot conveyor roller section 1, and the hot conveyor section 1 stops automatically.

[0042] The second stage is when there is a steel billet in the groove of the lifting chain. After the conditions for automatic feeding are met, the steel pusher pushes the steel into place and a signal is generated to determine that there is steel in the groove. After the lifting chain moves a certain distance, it resets and determines that there is no steel in the groove.

[0043] The third stage is when there are steel billets on the weighing roller conveyor. The through-beam laser detection sensor in the weighing roller conveyor area collects the signal that there are steel billets in the area. When steel enters the weighing roller conveyor, when the tail of the steel passes through the hot inspection of the weighing roller conveyor, it is determined that there is no steel on the weighing roller conveyor and the weighing roller conveyor stops running automatically after a delay. At the same time, the furnace positioning is completed.

[0044] Step 2 is divided into two stages. The first stage is the detection of billet temperature on the hot conveyor roller. A hot metal detection sensor in the hot conveyor roller area collects the billet signal and temperature signal in this area.

[0045] The second stage involves billet temperature detection at the furnace inlet of the weighing roller conveyor. A hot metal detection sensor collects billet and temperature signals in this area. The purpose is to track the time the billet remains exposed to external heat during transport. Excessive exposure time can cause the red-hot steel temperature to drop by about 120°C, and the heat loss will require a large amount of gas for secondary heating.

[0046] In step three, the hot conveyor roller table is divided into two sections: hot conveyor roller table section 0 and hot conveyor roller table section 1. Since the steel billets from the steelmaking process occupy three rollers in the hot conveyor section 1 on the rolling side, these three rollers are separated and designated as hot conveyor section 0.

[0047] When the start signal of the hot conveyor roller changes from 0 to 1, the hot conveyor roller is automatically triggered to rotate forward, transporting the steel billets produced in the continuous casting workshop of the steelmaking plant from the hot conveyor roller to the pusher equipment area;

[0048] When the hot conveyor roller stop signal changes from 0 to 1, it automatically triggers the hot conveyor roller to stop rotating forward. Through the action of two successive control pulses, the hot conveyor roller start signal and the hot conveyor roller stop signal, the roller completes the transfer of steel billets in the area from movement to stop.

[0049] In step four, the pusher operates by pushing steel billets in groups of 3-6. Preferably, the steelmaking and rolling mill delivers steel billets in groups of 4 or 3 hot billets. The pusher is a hydraulic cylinder pusher structure. Its extension and retraction stroke is measured by a hydraulic cylinder displacement sensor, which has an absolute value attribute. The distance it moves forward or backward, as well as its relative distance to the lifting chain groove, are fixed values. During the pushing process, the movement position of the pusher corresponds one-to-one with the position of the pushed steel billet. Normally, if there is no steel billet signal in the lifting chain groove obtained in step one, the pusher is triggered to automatically push the steel billet forward. The position of the pusher is collected by the position sensor built into the hydraulic cylinder, which corresponds to the movement position of the steel billet. This position is then aligned with the position of the lifting chain groove. When the pushed steel billet reaches the lifting chain groove, the pusher is stopped. By selecting different steel billet grouping modes (3-6 billets per group), the pusher's retraction is automatically controlled to meet different production rhythm requirements. Through the automatic start and stop of the pusher, the steel billet is advanced from the hot conveyor roller to the lifting chain area.

[0050] In step five, the absence of billets on the furnace weighing roller conveyor is a process trigger signal. To improve the smooth connection of billet feeding when there are no billets on the furnace weighing roller conveyor, the lifting chain, as an intermediate device between the furnace weighing roller conveyor and the hot conveying roller conveyor, needs to transfer billets from the previous area to the next area. The forward movement of the pusher is a permissible condition. The forward movement of the lifting chain will lift the billets in its grooves to the feeding roller conveyor. The presence of billets in the reset grooves indirectly triggers the forward movement of the pusher; therefore, it is designed to meet the conditions for the pusher's forward movement. The lifting chain's forward movement is triggered by a delay in the signal from the through-beam grating at the bottom of the lifting chain.

[0051] There are two modes for steel lifting via the lifting chain, depending on the different production rhythms: intermediate waiting and direct steel lifting.

[0052] When the intermediate waiting position is adopted, after the hot conveying section 1 stops, the steel pusher automatically pushes the steel. After the first steel billet falls into the groove, the lifting chain automatically lifts the steel billet to the intermediate waiting position (the initial position of the lifting chain). When the second billet is lifted up, the first billet is sent to the furnace weighing roller conveyor. When the hot detector of the furnace weighing roller conveyor detects the presence of steel, the weighing device automatically rises to perform the weighing action. After rising and holding for 7 seconds, it automatically descends. After the steel billet is placed on the roller conveyor, the furnace weighing roller conveyor automatically runs to load steel. When there is steel on the furnace weighing roller conveyor, the lifting chain remains in a waiting position and does not perform the lifting action. After the steel on the furnace weighing roller conveyor enters the furnace, the furnace weighing roller conveyor shows no steel, and the lifting chain automatically performs the lifting action.

[0053] When direct steel lifting is adopted (directly from the trough to the furnace weighing roller conveyor), after the hot conveying section 1 stops, the steel pusher automatically pushes the steel. After the steel billet falls into the trough, if there is no steel on the furnace weighing roller conveyor or the furnace weighing roller conveyor runs automatically, the lifting chain automatically lifts the steel billet and sends it to the furnace weighing roller conveyor. When the lifting chain automatically lifts the steel to 3.5 meters, the steel pusher automatically pushes the steel billet into the trough. At 7.5 meters, if the signal that there is steel on the furnace weighing roller conveyor has not disappeared, the lifting chain will automatically stop until there is no steel on the furnace weighing roller conveyor. Then the lifting chain will run again and lift the steel billet to the furnace weighing roller conveyor.

[0054] In step six, the function of the furnace-feeding weighing roller conveyor is to transport the steel billet to the heating furnace, which is the last station of the feeding system. The set time is 6-8 seconds, preferably 7 seconds. The automatic operation of the steel loading forward movement is triggered by a steel loading signal from the heating furnace PLC, which is interlocked with the walking beam of the heating furnace; the automatic operation of the steel loading stopping movement is triggered by a pulse signal at the moment when the steel billet passes the last roller of the furnace-feeding weighing roller conveyor. The weighing device is a roller scale, which is existing technology.

[0055] In step seven, the rolling line PLC system is used to send the rolling specifications. According to the billet rhythm required for different rolling specifications, an automatic control program can be written to send the rolling line steel demand signal to the steelmaking continuous casting. After receiving the steel demand signal, the continuous casting automatically assembles the billets and sends them to the rolling mill.

[0056] In step eight, without affecting the steel loading rhythm, when there is steel in the hot conveying section 1 of the rolling mill, the steel sorting machine moves forward. The hot conveying section 2 of the steelmaking process needs to prepare a set of steel billets. Specifically, the rolling mill heating furnace PLC sends a steel request signal, and the steelmaking process sends steel billets to the hot conveying section 2 of the steelmaking process to wait according to the steel request signal. The steel sorting machine of the rolling mill moves back to its position, the hot conveying section 1 of the rolling mill moves forward, and sends a forward signal to the steelmaking process, which then sends steel over. Since the steel billets from the steelmaking process occupy three rollers in the hot conveying section 1 of the rolling mill, these three rollers are separated and designated as the hot conveying section 0. The forward movement and speed of the hot conveying section 0 follow the forward movement and speed of the hot conveying section 2 of the steelmaking process; when the hot conveying section 2 of the steelmaking process moves forward, the hot conveying section 0 moves forward; when the hot conveying section 2 of the steelmaking process stops, the hot conveying section 0 stops.

[0057] The feeding system comprises four equipment areas: the hot conveyor roller conveyor, the lifting chain, and the furnace weighing roller conveyor. Through the aforementioned eight steps, and utilizing billet signal tracking and traction at each stage, the equipment in different areas is linked together in a chain-like, interconnected control system. To address equipment malfunctions or other anomalies during production, the hot conveyor roller conveyor, lifting chain, and furnace weighing roller conveyor are all equipped with both automatic and manual control modes. Automatic mode is selected for normal production, while manual mode is used for abnormal situations. In manual mode, bypass equipment linkage can be implemented, allowing for independent control of each area's equipment and manual intervention to handle on-site anomalies.

[0058] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention, and these will not affect the effectiveness of the implementation of the present invention or the practicality of the patent.

Claims

1. A hot-feeding control method for improving the automatic control of steel feeding rhythm at the furnace temperature of rolled steel, characterized in that, The method is as follows: Step 1. Tracking the steel billet signal in front of the furnace: Collect the billet signal from the hot conveyor rollers, the lifting chain, and the weighing rollers entering the furnace. Step 2. Acquisition of billet temperature signals in front of the furnace: Temperature detection is performed on the billets at the inlet of the hot conveying roller conveyor and the weighing roller conveyor. Step 3. Automatic control of the hot conveyor roller: using the billet signal of the hot conveyor roller obtained in Step 1, generate the hot conveyor roller start signal and the hot conveyor roller stop signal. Step 4. Automatic control of the steel pusher: Using the no-bill signal of the lifting chain groove obtained in Step 1, the steel pusher is triggered to automatically push the billet forward. The steel pusher performs steel pushing operations in a group mode of multiple billets to meet the needs of different production rhythms. Step 5. Automatic control of the lifting chain: When there is no steel billet on the weighing roller conveyor and the steel pusher is capable of forward movement, the lifting chain automatically moves forward to lift the steel. Step 6. Automatic control of the furnace weighing roller conveyor: When the furnace weighing roller conveyor detects a signal that there is steel, the weighing device automatically rises to perform the weighing action. After rising and holding for a set time, it automatically descends to put the steel billet down onto the roller conveyor. The furnace weighing roller conveyor then automatically runs to load the steel. Step 7. Data exchange between the heating furnace and the rolling line: the rolling line PLC sends the rolling specifications and the signal that the first stand of the rolling mill has steel to the heating furnace PLC. Step 8. Data exchange between steelmaking and rolling: The PLC of the rolling heating furnace sends a steel demand signal to the steelmaking continuous casting, and the steelmaking continuous casting sends the billet to the designated steelmaking hot delivery section according to the steel demand signal. Step 1 is divided into three stages. The first stage is when there is a steel billet on the hot conveyor roller. Two hot metal detection sensors in the hot conveyor roller area collect the signal that there is a steel billet in the area. After the conditions for automatic start are met, the hot conveyor roller passes through the front end of the hot conveyor roller section 1 and the hot detection signal is delayed. It is determined that there is steel in the hot conveyor roller section 1, and the hot conveyor section 1 stops automatically. The second stage is when there is a steel billet in the groove of the lifting chain. After the conditions for automatic feeding are met, the steel pusher pushes the steel into place and a signal is generated to determine that there is steel in the groove. After the lifting chain moves a certain distance, it resets and determines that there is no steel in the groove. The third stage is when there are steel billets on the weighing roller conveyor. The through-beam laser detection sensor in the weighing roller conveyor area collects the signal that there are steel billets in the area. When steel enters the weighing roller conveyor, when the tail of the steel passes through the hot detection of the weighing roller conveyor, it is determined that there is no steel on the weighing roller conveyor and the weighing roller conveyor stops running automatically after a delay. At the same time, the furnace positioning is completed. Step 2 is divided into two stages. The first stage is the detection of billet temperature on the hot conveyor roller. A hot metal detection sensor in the hot conveyor roller area collects the billet signal and temperature signal in this area. The second stage involves billet temperature detection at the furnace inlet of the weighing roller conveyor. A hot metal detection sensor is used to collect billet and temperature signals in this area. In step three, the hot conveyor roller table is divided into two sections: hot conveyor roller table section 0 and hot conveyor roller table section 1. Since the steel billets from the steelmaking process occupy three rollers in the hot conveyor section 1 on the rolling side, these three rollers are separated and designated as hot conveyor section 0. When the start signal of the hot conveyor roller changes from 0 to 1, the hot conveyor roller is automatically triggered to rotate forward, transporting the steel billets produced in the continuous casting workshop of the steelmaking plant from the hot conveyor roller to the pusher equipment area; When the hot conveyor roller stop signal changes from 0 to 1, the hot conveyor roller is automatically triggered to stop rotating forward. Through the action of two successive control pulses, the hot conveyor roller start signal and the hot conveyor roller stop signal, the roller completes the transfer of steel billets in the area from movement to stop. In step four, the steel pusher pushes steel billets in groups of 3-6. In step five, the steel lifting chain operates in two modes depending on the production rhythm: mid-level waiting and direct steel lifting; When the middle position is waiting, after the hot delivery section 1 stops, the steel pusher automatically pushes the steel. After the first steel billet falls into the groove, the lifting chain automatically lifts the steel billet to the middle position for waiting. When the second billet is lifted up, the first billet is sent to the furnace weighing roller table. When direct steel lifting is adopted, after the hot conveying section 1 stops, the steel pusher automatically pushes the steel. After the steel billet falls into the groove, the furnace weighing roller is empty or the furnace weighing roller runs automatically. The lifting chain automatically lifts and sends the steel billet to the furnace weighing roller. In step six, the time is set to 6-8 seconds. The automatic operation of the steel loading forward movement is triggered by the steel loading signal required by the PLC of the steel rolling heating furnace. This signal is interlocked with the walking beam of the steel rolling heating furnace. The automatic operation of the steel loading stopping movement is triggered by the pulse signal at the moment when the billet passes the last roller of the furnace weighing roller.

2. The hot-feeding control method for automatically controlling the feeding rhythm to improve the furnace temperature of rolled steel as described in claim 1, characterized in that, The hot conveyor rollers, lifting chains, and furnace weighing rollers are all equipped with both automatic and manual control modes. The automatic mode is selected during normal production, and the manual mode is selected in case of abnormality. In the manual mode, bypass equipment linkage can be used to control the equipment in each area independently and handle abnormal situations on site through manual intervention.

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