A low-cost control method for reversing combustion

Abstract

The present invention provides a control method for low-cost reversing combustion, which relates to the field of combustion technology of heating furnaces in steel rolling mills. The control device based on low-cost reversing combustion includes a heating furnace, the top of the inner wall of the heating furnace is fixedly connected with a support plate, the top of the support plate is fixedly connected with an electric slide rail, the top of the sliding sleeve is fixedly connected with a support block, one end of the bidirectional screw is fixedly connected with a servo motor, the outer wall of the bidirectional screw is threaded with two screw sleeves, the middle of both sides of the heating furnace is fixedly connected with a uniformly distributed three-way reversing valve, the top of the gas connecting pipe is fixedly connected with a regulating valve, and the top of the regulating valve is fixedly connected with a gas inlet pipe. By setting a combination of a clamping device and a push plate, the main body of the steel billet can be transported in time after heating is completed, and the effect of not wasting gas can be achieved by controlling the three-way reversing valve and the connecting structure during the heating and combustion process.

Description

Technical Field

[0001] The invention relates to the field of combustion technology of heating furnaces in steel rolling mills, and in particular to a low-cost reversing combustion control method. Background Art

[0002] A rolling mill is a place where steel rolling production is carried out. The steel billets in the rolling mill are products obtained by casting the molten steel produced in the steel-making furnace. Steel billets refer to semi-finished products used to produce steel and are generally not directly available for social use. Steel billets need to be heated in a heating furnace before rolling. The purpose of heating is to increase plasticity and improve the internal structure and properties of the metal.

[0003] The regenerative heating furnace is heated on both sides. After the billet is heated and taken out of the furnace, the rolling mill bites into the billet. Due to the slow running speed of the rolling mill, the tail of the billet stays on the roller for a long time, resulting in temperature drop and fluctuation in the performance of the head and tail of the steel. When reversing, the gas in the pipeline from the reversing valve to the burner is discharged with the flue gas, resulting in gas waste. Therefore, a control method for low-cost combustion is studied. Summary of the invention

[0004] In view of the deficiencies of the prior art, the present invention provides a low-cost control method for reversing combustion, which solves the problem of large temperature difference between the head and tail of the steel billet and waste of coal gas.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a low-cost reversing combustion control device, including a heating furnace, support plates are fixedly connected to the top of the inner wall of the heating furnace, electric slide rails are fixedly connected to the top of the support plates, sleeves are slidably connected to the outer wall of the top of the electric slide rails, support blocks are fixedly connected to the top of the sleeves, bidirectional screws are rotatably connected inside the support blocks, a servo motor is fixedly connected to one end of the bidirectional screw, a protective cover is fixedly connected to the outer wall of the servo motor, two screw sleeves are threadedly connected to the outer wall of the bidirectional screw, three-way reversing valves are fixedly connected to the inside of the middle of both sides of the heating furnace, gas connecting pipes are fixedly connected to the top of the three-way reversing valves, regulating valves are fixedly connected to the top of the regulating valves, and gas inlet pipes are fixedly connected to the top of the regulating valves.

[0006] Preferably, a square hole is opened inside one side of the heating furnace, a slider is fixedly connected to the bottom end of the protective cover, the outer wall of the slider is slidably connected to the inside of the heating furnace through a groove, and the protective cover is slidably connected to the inside of the square hole.

[0007] Preferably, the bottom end of the screw sleeve is fixedly connected to a connecting plate, the bottom end of the connecting plate is fixedly connected to an L-shaped clamp, a steel billet body is arranged on one side close to the L-shaped clamp, the bottom end of the steel billet body is arranged on the bottom wall of the heating furnace, the front side of the heating furnace is fixedly connected to a connecting inclined plate, the bottom of the front side of the connecting inclined plate is fixedly connected to a conveying roller, the rear side of the conveying roller is fixedly connected to the front side of the heating furnace, and the top end of the screw sleeve is slidably connected to the top wall of the heating furnace.

[0008] Preferably, the gas inlet pipes are fixedly connected to a gas storage chamber at one end thereof, and the bottom end of the gas storage chamber is fixedly connected to the top end of the heating furnace.

[0009] Preferably, the first electric telescopic rod is fixedly connected to both sides of the rear side of the top wall of the heating furnace, the bottom end of the first electric telescopic rod is fixedly connected to a fixing plate, the front side of the fixing plate is fixedly connected to the second electric telescopic rod, and the front end of the second electric telescopic rod is fixedly connected to a push plate.

[0010] Preferably, the bottom end of the three-way reversing valve is fixedly connected to an air connecting pipe, the end away from the bottom of the air connecting pipe is fixedly connected to a manual butterfly valve, the end away from the manual butterfly valve is fixedly connected to an air inlet, and the end close to the three-way reversing valve is fixedly connected to a burner, and the burner is arranged inside the heating furnace.

[0011] Preferably, a control method for a low-cost reversing combustion control device, the billet body conveying process comprises the following steps:

[0012] a1. The servo motor inside the protective cover is controlled by the remote operation panel. The servo motor drives the bidirectional screw to rotate, and then the two screw sleeves connected to the outer wall of the bidirectional screw run inward in the opposite direction to clamp the main body of the billet;

[0013] a2. At this time, the support blocks on the outer walls of both ends of the bidirectional screw drive the clamped billet body forward to the inside of the heating furnace through the sliding sleeve combined with the electric slide rail. The L-shaped clamping plate releases the billet body and places it on the bottom wall of the heating furnace, and immediately moves backward to the position of the next billet body for easy circulation and transmission. At this time, the billet body can be heated by the burner inside the heating furnace;

[0014] a3. After the heating is completed, the first electric telescopic rod drives the fixed plate downward to a certain height, and then the second electric telescopic rod starts to drive, so that the push plate moves forward, and then the main body of the steel billet is pushed to fall onto the conveyor roller through the connecting inclined plate, and then the conveyor roller conveys the heated main body of the steel billet to other designated positions, reducing the temperature difference between the head and tail of the steel billet.

[0015] Preferably, the billet body heating and combustion method comprises the following steps:

[0016] b1. After the main body of the steel billet enters the heating furnace and is placed, the operation of the three-way reversing valve is controlled according to the computer operation program. The speed and amount of gas entering the gas storage chamber are controlled by adjusting the regulating valve, and the speed and amount of air entering the gas storage chamber are controlled by adjusting the manual butterfly valve. The gas and air connected to the three-way reversing valve enter alternately, and the reversing time of the three-way reversing valve is set within 1s to improve the reversing accuracy and the furnace pressure stability rate;

[0017] b2. Program the switching time of the three-way reversing valve group in the main control computer program from 60s to 65s, and set the reversing mode to same-side combustion, and reversing combustion after reaching the temperature of the heating section;

[0018] b3. Since the output end of the three-way reversing valve is connected to the burner, the burner heats the main body of the steel billet evenly according to the controlled gas and air output and reduces the gas consumption.

[0019] The present invention provides a low-cost control method for reversing combustion, which has the following beneficial effects:

[0020] 1. When the billet body is transported to the rear of the heating furnace by the present invention, the servo motor drives the screw sleeve combined with the outer wall of the connected bidirectional screw to drive the L-shaped clamping plate at the bottom of the connecting plate to clamp the billet body. After clamping, the outer walls of both ends of the bidirectional screw can be transported to the inside of the heating furnace and released for placement by the combination of the sliding sleeve connected by the support block and the electric slide rail. After release, the L-shaped clamping plate moves backward. At this time, after the heating of the billet body is completed, the first electric telescopic rod drives the fixed plate to move downward and the bottom end of the push plate contacts the bottom wall of the heating furnace. The second electric telescopic rod drives the push plate to move forward, and then pushes the billet body to the connecting inclined plate, and finally falls onto the conveying roller. At this time, the conveying roller drives the billet body to be transported to other positions, so that the billet body does not stay for a long time, and the head and tail are transmitted at the same time, so that there will be no big difference between the head and tail of the billet body, thereby achieving the same performance effect of the head and tail of the billet body.

[0021] 2. After the main body of the steel billet is placed, the present invention uses a computer program to operate the alternating inflow of gas and air in the three-way reversing valve. A regulating valve is installed at the connection between the top gas connecting pipe and the gas inlet pipe, which can control the speed and amount of gas entering. The air connecting pipe at the bottom of the three-way reversing valve is connected to the air inlet port through a manual butterfly valve, which can control the speed and amount of air entering. Then, after the gas and air enter alternately, they are discharged through the burner connected to the three-way reversing valve, so that the steel billet main body is heated and burned. Since burners are arranged on both sides for discharge and combustion, the steel billet main body can be evenly heated and burned, so that the gas in the burner will not be discharged with the smoke when the three-way reversing valve is reversed, thereby achieving the effect of not wasting gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a main perspective view of the present invention;

[0023] Figure 2 is a side perspective view of the present invention;

[0024] Figure 3 is a rear perspective view of the present invention;

[0025] Figure 4 It is a front perspective view of the push plate structure of the present invention;

[0026] Figure 5 It is a front perspective view of the heating and combustion structure of the present invention;

[0027] Figure 6 It is a partial cross-sectional view looking downwards of the present invention;

[0028] Figure 7 It is a front cross-sectional view of the protective cover structure of the present invention.

[0029] Among them, 1. gas inlet pipe; 2. regulating valve; 3. gas connecting pipe; 4. three-way reversing valve; 5. air connecting pipe; 6. manual butterfly valve; 7. air inlet; 8. heating furnace; 9. burner; 10. connecting inclined plate; 11. gas storage chamber; 12. screw sleeve; 13. support block; 14. electric slide rail; 15. sleeve; 16. bidirectional screw; 17. connecting plate; 18. L-shaped clamping plate; 19. conveying roller; 20. square hole; 21. first electric telescopic rod; 22. fixing plate; 23. support plate; 24. second electric telescopic rod; 25. push plate; 26. servo motor; 27. protective cover; 28. slider; 29. ​​groove; 30. billet body. DETAILED DESCRIPTION

[0030] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Example:

[0032] like Figure 1-7As shown, the embodiment of the present invention provides a low-cost reversing combustion control device, including a heating furnace 8, the top of the inner wall of the heating furnace 8 is fixedly connected to a support plate 23, the top of the support plate 23 is fixedly connected to an electric slide rail 14, the outer wall of the top of the electric slide rail 14 is slidably connected to a sliding sleeve 15, the top of the sliding sleeve 15 is fixedly connected to a support block 13, the support block 13 is rotatably connected to a bidirectional screw 16, one end of the bidirectional screw 16 is fixedly connected to a servo motor 26, the outer wall of the servo motor 26 is fixedly connected to a protective cover 27, and the bidirectional screw 16 is fixedly connected to the outer wall of the servo motor 26. 6 has two screw sleeves 12 connected to the outer wall by threads, three-way reversing valves 4 evenly distributed are fixedly connected to the middle parts of both sides of the heating furnace 8, the top of the three-way reversing valve 4 is fixedly connected to the gas connecting pipe 3, the top of the gas connecting pipe 3 is fixedly connected to the regulating valve 2, and the top of the regulating valve 2 is fixedly connected to the gas inlet pipe 1. By setting the three-way reversing valve 4, the reversing accuracy can be improved, the steel billet body 30 can be evenly heated and burned, so that when the three-way reversing valve 4 is reversed, the gas in the burner 9 will not be discharged with the smoke, thereby achieving the effect of not wasting gas.

[0033] A square hole 20 is provided inside one side of the heating furnace 8, a slider 28 is fixedly connected to the bottom end of the protective cover 27, the outer wall of the slider 28 is slidably connected to the inside of the heating furnace 8 through a groove 29, and the protective cover 27 is slidably connected to the inside of the square hole 20. The servo motor 26 is arranged inside the protective cover 27 so that its performance will not be affected by the increase in temperature of the heating furnace 8, and the protective cover 27 has heat insulation properties. In addition, the protective cover 27 is combined with the slider 28 and the groove 29 in the square hole 20 to improve stability, so that the servo motor 26 can continuously drive the structure connected by the bidirectional screw 16 to operate stably.

[0034] The bottom end of the screw sleeve 12 is fixedly connected to a connecting plate 17, the bottom end of the connecting plate 17 is fixedly connected to an L-shaped clamping plate 18, a steel billet body 30 is arranged on the side close to the L-shaped clamping plate 18, the bottom end of the steel billet body 30 is arranged on the bottom wall of the heating furnace 8, the front side of the heating furnace 8 is fixedly connected to a connecting inclined plate 10, the bottom of the front side of the connecting inclined plate 10 is fixedly connected to a conveying roller 19, the rear side of the conveying roller 19 is fixedly connected to the front side of the heating furnace 8, and the top end of the screw sleeve 12 is slidably connected to the top wall of the heating furnace 8.

[0035] The gas inlet pipe 1 is fixedly connected to a gas storage chamber 11 at one end thereof, and the bottom end of the gas storage chamber 11 is fixedly connected to the top of the heating furnace 8, so as to facilitate the transmission of the gas.

[0036] A first electric telescopic rod 21 is fixedly connected to both sides of the rear side of the inner top wall of the heating furnace 8, a fixed plate 22 is fixedly connected to the bottom end of the first electric telescopic rod 21, a second electric telescopic rod 24 is fixedly connected to both sides of the front side of the fixed plate 22, and a push plate 25 is fixedly connected to the front end of the second electric telescopic rod 24, which can stably push the steel billet body 30 to be transported to the next device, and reversely run and fold it up after pushing it down, thereby not hindering the entry of the next steel billet body 30.

[0037] The bottom end of the three-way reversing valve 4 is fixedly connected to an air connecting pipe 5, the end away from the bottom of the air connecting pipe 5 is fixedly connected to a manual butterfly valve 6, the end away from the manual butterfly valve 6 is fixedly connected to an air inlet 7, and the end close to the three-way reversing valve 4 is fixedly connected to a burner 9, and the burner 9 is arranged inside the heating furnace 8. By arranging the manual butterfly valve 6 and the three-way reversing valve 4, the entry of gas and air can be more effectively controlled.

[0038] A control method for a low-cost reversing combustion control device, wherein the billet body 30 conveying process comprises the following steps:

[0039] a1. The servo motor 26 is driven by the remote control panel inside the protective cover 27, and the servo motor 26 drives the bidirectional screw 16 to rotate, and then the two screw sleeves 12 connected to the outer wall of the bidirectional screw 16 run inward in the opposite direction to clamp the billet body 30;

[0040] a2. At this time, the support blocks 13 on the outer walls of both ends of the bidirectional screw 16 are driven by the sliding sleeve 15 combined with the electric slide rail 14 to make the clamped billet body 30 move forward to the inside of the heating furnace 8, and then the L-shaped clamping plate 18 releases the billet body 30 to place it on the bottom wall of the heating furnace 8, and immediately moves backward to the position of the next billet body 30 for easy circulation and transmission. At this time, the billet body 30 can be heated by the burner 9 inside the heating furnace 8;

[0041] a3. After the heating is completed, the first electric telescopic rod 21 drives the fixed plate 22 to move downward to a certain height, and then the second electric telescopic rod 24 starts to drive, so that the push plate 25 moves forward, and then the billet body 30 is pushed to fall onto the conveying roller 19 through the connecting inclined plate 10, and then the conveying roller 19 conveys the heated billet body 30 to other designated positions, reducing the temperature difference between the head and tail of the billet, and the temperature difference between the head and tail of the billet body 30 is measured by a temperature measuring gun, and through the designed heating process, the second addition is set to 840±10℃, the first addition is set to 1040±10℃, and the uniform heating is set to 1150±10℃ to burn the billet body 30, wherein the billet body 30 modifies the deviation time of each section according to the temperature difference, and the deviation increases the value by 10℃, so that the temperature difference between the head and tail of the billet is controlled within 15℃, ensuring smooth rolling and improving the performance of the steel rod, and finally the billet body 30 is re-measured by a temperature measuring gun after a period of time, and this time period is set to ten minutes, which can also be adjusted according to actual conditions.

[0042] The heating and burning method of the steel billet body 30 includes the following steps:

[0043] b1. After the billet body 30 enters the heating furnace 8 and is placed, the operation of the three-way reversing valve 4 is controlled according to the computer operating program, and the speed and amount of gas entering the gas storage chamber 11 are controlled by adjusting the regulating valve 2, and the speed and amount of air entering the gas storage chamber 11 are controlled by adjusting the manual butterfly valve 6. The gas and air connected to the three-way reversing valve 4 enter alternately, and the reversing time of the three-way reversing valve 4 is set within 1s to improve the reversing accuracy and the furnace pressure stability. The post worker modifies the reversing time ratio on both sides according to the temperature difference of the billet body 30 to extend the combustion time;

[0044] b2. Program the switching time of the 4 groups of three-way reversing valves in the main control computer program from 60s to 65s, which can reduce the switching times by 110 times per day, and set the switching mode to same-side combustion, and the combustion will be switched after the temperature of the heating section is reached, thereby reducing gas consumption and saving costs;

[0045] b3. Since the output end of the three-way reversing valve 4 is connected to the burner 9, the burner 9 heats the steel billet body 30 evenly according to the controlled gas and air output and reduces the gas consumption. Since the burner 9 is provided on both sides, the steel billet body 30 is set to be started by the burner 9 on one side for combustion. After reaching the temperature of the heating section, the burner 9 on the other side is started to burn the other side of the steel billet body 30.

[0046] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A low-cost reversing combustion control device, comprising a heating furnace (8), Features: The top of both sides of the inner wall of the heating furnace (8) are fixedly connected to support plates (23), the top of the support plates (23) are fixedly connected to electric slide rails (14), the outer wall of the top of the electric slide rail (14) is slidably connected to a sleeve (15), the top of the sleeve (15) is fixedly connected to a support block (13), the inside of the support block (13) is rotatably connected to a bidirectional screw (16), one end of the bidirectional screw (16) is fixedly connected to a servo motor (26), the outer wall of the servo motor (26) is fixedly connected to a protective cover (27), the outer wall of the bidirectional screw (16) is threadedly connected to two screw sleeves (12), the middle of both sides of the heating furnace (8) are fixedly connected to three-way reversing valves (4) evenly distributed, the top of the three-way reversing valve (4) is fixedly connected to a gas connecting pipe (3), the top of the gas connecting pipe (3) is fixedly connected to a regulating valve (2), and the top of the regulating valve (2) is fixedly connected to a gas inlet pipe (1); The bottom end of the screw sleeve (12) is fixedly connected to a connecting plate (17), the bottom end of the connecting plate (17) is fixedly connected to an L-shaped clamping plate (18), a steel billet body (30) is arranged on one side close to the L-shaped clamping plate (18), the bottom end of the steel billet body (30) is arranged on the bottom wall of the heating furnace (8), the front side of the heating furnace (8) is fixedly connected to a connecting inclined plate (10), the bottom of the front side of the connecting inclined plate (10) is fixedly connected to a conveying roller (19), the rear side of the conveying roller (19) is fixedly connected to the front side of the heating furnace (8), and the top end of the screw sleeve (12) is slidably connected to the top wall of the heating furnace (8); The first electric telescopic rod (21) is fixedly connected to both sides of the rear side of the inner top wall of the heating furnace (8), the bottom end of the first electric telescopic rod (21) is fixedly connected to a fixing plate (22), the front side of the fixing plate (22) is fixedly connected to the second electric telescopic rod (24), and the front end of the second electric telescopic rod (24) is fixedly connected to a push plate (25).

2. A low-cost reversing combustion control device according to claim 1, Features: A square hole (20) is provided inside one side of the heating furnace (8), a slider (28) is fixedly connected to the bottom end of the protective cover (27), an outer wall of the slider (28) is slidably connected to the inside of the heating furnace (8) via a groove (29), and the protective cover (27) is slidably connected to the inside of the square hole (20).

3. A low-cost reversing combustion control device according to claim 1, Features: The gas inlet pipes (1) are fixedly connected to one end thereof and are connected to a gas storage chamber (11). The bottom end of the gas storage chamber (11) is fixedly connected to the top end of the heating furnace (8).

4. A low-cost reversing combustion control device according to claim 3, Features: The bottom end of the three-way reversing valve (4) is fixedly connected to an air connecting pipe (5), the end of the air connecting pipe (5) away from the bottom is fixedly connected to a manual butterfly valve (6), the end of the manual butterfly valve (6) away from the bottom is fixedly connected to an air inlet (7), and the end of the three-way reversing valve (4) close to the bottom is fixedly connected to a burner (9), and the burner (9) is arranged inside the heating furnace (8).

5. The control method of the low-cost reversing combustion control device according to claim 4, Features: The steel billet body (30) conveying process comprises the following steps: a1. The servo motor (26) inside the protective cover (27) is driven by the remote operation panel. The servo motor (26) drives the bidirectional screw (16) to rotate, and then the two screw sleeves (12) connected to the outer wall of the bidirectional screw (16) run inward in the opposite direction to clamp the billet body (30); a2. At this time, the support blocks (13) on the outer walls of both ends of the bidirectional screw (16) are driven by the sliding sleeve (15) combined with the electric slide rail (14) to make the clamped billet body (30) move forward to the inside of the heating furnace (8). The L-shaped clamping plate (18) releases the billet body (30) to place it on the bottom wall of the heating furnace (8), and immediately moves backward to the position of the next billet body (30) to facilitate cyclic transmission. At this time, the billet body (30) can be heated by the burner (9) inside the heating furnace (8); a3. After the heating is completed, the first electric telescopic rod (21) drives the fixed plate (22) to move downward to a certain height, and then the second electric telescopic rod (24) starts to drive, so that the push plate (25) moves forward, thereby pushing the steel billet body (30) to fall onto the conveying roller (19) through the connecting inclined plate (10), and then the conveying roller (19) conveys the heated steel billet body (30) to other designated positions, thereby reducing the temperature difference between the head and tail of the steel billet.

6. The control method of the low-cost reversing combustion control device according to claim 4, Features: The method for heating and burning the steel billet body (30) comprises the following steps: b1. After the steel billet body (30) enters the heating furnace (8) and is placed in place, the operation of the three-way reversing valve (4) is controlled according to the computer operating program, and the speed and amount of gas entering the gas storage chamber (11) are controlled by adjusting the regulating valve (2), and the speed and amount of air entering the gas storage chamber (11) are controlled by adjusting the manual butterfly valve (6), and the gas and air connected to the three-way reversing valve (4) enter alternately, and the reversing time of the three-way reversing valve (4) is set within 1 second to improve the reversing accuracy and improve the furnace pressure stability rate; b2. Program the switching time of the three-way reversing valve (4) group in the main control computer program from 60s to 65s, and set the switching mode to same-side combustion, and then reversing combustion after reaching the heating section temperature; b3. Since the output end of the three-way reversing valve (4) is connected to the burner (9), the burner (9) heats the steel billet body (30) evenly according to the controlled gas and air output, and reduces gas consumption.

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