A multi-furnace series step-by-step continuous heating furnace

Abstract

The application discloses a multi-furnace body series connection step-by-step continuous heating furnace, and relates to the technical field of heating furnaces.The heating furnace comprises a furnace loading base, a preheating base is fixedly installed at the rear bottom end of the furnace loading base through bolts, a heating base is fixedly installed at the rear side of the preheating base through bolts, and a furnace loading structure is arranged.The furnace loading structure comprises two fixed support rails which are fixedly installed at the top end of the furnace loading base through bolts.The application is provided with a plurality of furnace bodies, the preheating furnace body is separated from the heating furnace body, the high-temperature flue gas of the heating furnace body is used as the heat source of the preheating furnace body to preheat the steel billet, the flue gas temperature discharged from the preheating furnace body is the final flue gas temperature of the heating furnace body, a small amount of burners can be arranged in the preheating furnace body as auxiliary heating and adjusting burners, the flue gas temperature of the heating furnace can be accurately controlled, the flue gas temperature can be controlled at the lower limit of the anti-dew-point corrosion temperature, the energy consumption is reduced, and the chimney is not corroded.

Description

Technical Field

[0001] This invention relates to the field of heating furnace technology, specifically to a multi-furnace series walking beam continuous heating furnace. Background Technology

[0002] Walking beam furnaces are a type of continuous heating heat treatment equipment widely used in the industrial heat treatment industry. Chinese patent application number 202120713760.2 discloses "an automated forging robot processing walking beam continuous heating furnace equipment, in which two rotating curved plates cooperate with a circular plate to drive a vertical plate for rectangular pushing conveying, thereby realizing the conveying interval, increasing the heating time, ensuring the heating effect, and improving the work efficiency. This causes the concave plate to move outward on the inner wall of the groove, so that steel plates of different widths can be supported and heated, eliminating the limitations of use and making it easy to use. This allows the second threaded rod to detach from the vertical plate, and then the outer shell can be pulled outward to complete the disassembly. The reverse operation allows the outer shell to be installed, realizing disassembly and maintenance, facilitating operation, extending service life, and making it easy to promote and use."

[0003] The prior art only addressed the issues of unsatisfactory heating effects and short service life. Currently, billet heating furnaces generally have preheating, heating, and soaking sections. To accommodate the diffusion requirements of alloy components in some alloy steels, strict requirements are placed on the furnace dwell time, leading to increasingly longer furnace bodies and longer billet dwell times. This is unsuitable for producing steels prone to decarburization. Furthermore, it's impossible to control the intrusion of relatively hot flue gas from the heating section into the preheating section, making it difficult to accurately control the preheating temperature and heating rate. For hot-crack-sensitive steels with strict requirements on heating rate, hot cracking is very likely to occur, affecting product quality. Therefore, strict control of preheating is essential. The heating section and the temperature of the heating section are such that only by closing some burners in the heating section to ensure the billet heats up slowly can the heating capacity of the furnace be fully utilized. At the same time, when producing steel grades that are prone to decarburization, heat-sensitive steel grades, and steel grades that require long-term diffusion of constituent elements, the switching between steel grades often requires the use of methods such as empty furnace and empty step-by-step charging, which has a great impact on production. In addition, the heating furnace generally extracts flue gas in the preheating section. Since the heating section and the preheating section are not sufficiently separated, the flue gas temperature is affected by the temperature of the preheating section, making it difficult to control the exhaust temperature of the flue gas. The flue gas temperature discharged from the heating furnace fluctuates greatly and is too high, which is not conducive to energy saving and consumption reduction of the heating furnace. Summary of the Invention

[0004] The purpose of this invention is to provide a multi-furnace series walking beam continuous heating furnace to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a multi-furnace series walking beam continuous heating furnace, including a furnace loading base, a preheating base is fixedly installed on the rear bottom end of the furnace loading base by bolts, and a heating base is fixedly installed on the rear side of the preheating base by bolts.

[0006] The furnace loading structure includes two fixed support rails, which are bolted to the top two sides of the furnace loading base.

[0007] The preheating furnace installation structure includes an installation plate, a threaded rod, and a support slide rod. The installation plate is fixedly installed inside the preheating base near the right end at one-third of its length by bolts. A connecting hole is provided in the middle of the installation plate. The threaded rod is movably installed in the connecting hole by bearings. The end of the threaded rod away from the installation plate is movably installed in the middle of the left inner wall of the preheating base by bearings. There are two support slide rods, which are equidistantly distributed on both sides of the threaded rod. The two ends of the two support slide rods are respectively movably installed in the middle of the installation plate and the inner wall of the preheating base by bearings.

[0008] The furnace body conversion transmission structure includes a transmission disc, slots, an output wheel, and locking pins. The transmission disc is fixedly installed on the right side of the threaded rod by bolts. There are several slots arranged in a circular pattern on the side of the transmission disc away from the threaded rod. The output wheel is movably sleeved on the outside of the transmission disc. Several evenly arranged circular grooves are provided inside the output wheel. There are several locking pins inserted and movably installed in the grooves.

[0009] A stepping preheating structure includes a preheating furnace inlet / outlet motor and preheating furnace stepping wheels. There are four preheating furnace stepping wheels, which are divided into two groups. The output shaft of the preheating furnace inlet / outlet motor is fixedly installed with a preheating furnace stepping wheel away from the furnace base by bolts.

[0010] The heating structure includes a heating furnace body and a heating furnace inlet / outlet motor. The heating furnace body is fixedly installed on the top of the heating base by bolts, and the heating furnace inlet / outlet motor is fixedly installed on the rear end of the side wall of the heating furnace body by bolts.

[0011] Preferably, the furnace loading structure includes a furnace loading platform, rollers, and furnace entry roller conveyors. The furnace loading platform is slidably mounted on the top of a fixed support rail. Wheel grooves are provided on both sides of the bottom end of the furnace loading platform. There are several rollers, which are evenly divided into two groups and are movably mounted in the wheel grooves through bearings. There are several furnace entry roller conveyors, which are evenly divided into two groups and are movably mounted on the top of both sides of the furnace loading platform through bearings.

[0012] Preferably, the preheating furnace installation structure includes a preheating furnace body, a track support plate, movable support rails, and a sliding block. The preheating furnace body is fixedly installed on the top of the sliding block by bolts. The track support plate is fixedly installed on the bottom of the preheating furnace body by bolts. The track support plate is slidably connected to the top of the preheating base. There are two movable support rails, which are fixedly installed on the top of the track support plate by bolts. The distance between the two movable support rails is equal to the distance between the two fixed support rails, and the top of the movable support rails is flush with the top of the fixed support rails. The sliding block has a threaded hole in the middle, and sliding holes are equally spaced on both sides of the threaded hole. The threaded rod is threaded into the threaded hole, and the support sliding rod is inserted and slidably installed in the sliding hole. The sliding block is slidably connected between the preheating base and the mounting plate. The cross-sectional length of the bottom of the track support plate is equal to the cross-sectional length of the top of the sliding block, and each occupies one-third of the internal bottom cross-sectional length of the preheating base.

[0013] Preferably, the furnace body conversion transmission structure includes springs, a furnace body conversion motor, a first transmission belt, a transmission wheel, a first bevel gear, and a second bevel gear. Several springs are bolted to the bottom of the locking post and the bottom of the post groove, respectively. The locking post engages with the locking groove. The furnace body conversion motor is bolted to the bottom of the preheating base. The output shaft of the furnace body conversion motor is bolted to the middle of the output wheel on the side away from the locking groove. A pulley is bolted to the output shaft of the furnace body conversion motor. The first transmission belt is movably sleeved on the pulley. The transmission wheel is movably mounted on the mounting plate on the side away from the threaded rod via a bearing. The other end of the first transmission belt is movably sleeved on the transmission wheel. The first bevel gear is bolted to the middle of the transmission wheel on the side away from the mounting plate. The first bevel gear is movably mounted on the bottom of the preheating base via a bearing. The second bevel gear meshes with the first bevel gear at the bottom of the first bevel gear.

[0014] Preferably, the furnace body conversion transmission structure includes a second transmission belt, a central rotating wheel, a third transmission belt, a first transmission gear, and a sliding groove. The second transmission belt is movably sleeved on the bottom end of the second bevel gear. A mounting bracket is fixedly installed on the side of the preheating base near the furnace loading base by bolts. The central rotating wheel is movably mounted on the mounting bracket via a bearing. The other end of the second transmission belt is movably sleeved on the bottom end of the central rotating wheel. The third transmission belt is movably sleeved on the top end of the central rotating wheel. A gear plate is fixedly installed on the side of the preheating base near the furnace loading base by bolts. The first transmission gear is movably mounted on the top end of the gear plate via a bearing. The other end of the third transmission belt is movably sleeved on the bottom end of the first transmission gear. The sliding groove is fixedly installed between the bottom ends of the furnace loading base and the preheating base by bolts.

[0015] Preferably, the furnace body conversion transmission structure includes a first rack, a second rack, a second transmission gear, a connecting rod, and a third transmission gear. The first rack is inserted and slidably installed in a slide groove. The first rack has internal tooth grooves on the side near the preheating base. The first rack has external tooth grooves on one-third of its side near the furnace loading base and near the right side of the preheating base. The second rack is fixedly installed on the bottom end of the furnace loading platform near the first transmission gear by bolts. The second transmission gear meshes with the second rack. The connecting rod is fixedly installed on the bottom end of the second transmission gear by bolts. A connecting block is fixedly installed on the side of the slide groove near the furnace loading base by bolts. The connecting rod is inserted into the connecting block by a bearing. The third transmission gear is fixedly installed on the bottom end of the connecting rod by bolts. The third transmission gear meshes with the external tooth groove of the first rack.

[0016] Preferably, the walking beam preheating structure includes preheating furnace connecting arms, a preheating furnace top material bed, a preheating furnace roller conveyor, a preheating furnace flue gas inlet pipe, and a preheating furnace flue gas outlet pipe. There are four preheating furnace connecting arms, and their bottom ends are respectively mounted on the side of the preheating furnace walking wheel away from the preheating furnace inlet / outlet motor via bearings, and located away from the center of the preheating furnace walking wheel. The top ends of the preheating furnace connecting arms are fixed to the left and right bottom ends of the preheating furnace top material bed by bolts. There are several preheating furnace roller conveyors, divided into two groups, evenly mounted on the left and right sides of the preheating furnace body via bearings. The top of the preheating furnace rollers is flush with the top of the inlet rollers. The top material bed of the preheating furnace is located between the two sets of preheating furnace rollers. The walking wheel of the preheating furnace is welded with a linkage gear on the side near the inner wall of the preheating furnace body, and a chain is sleeved on the two linkage gears on the same side. The preheating furnace flue gas outlet is opened on the left side of the top of the preheating furnace body, and the preheating furnace flue gas inlet is opened on the right side of the top of the preheating furnace body. The preheating furnace flue gas inlet pipe is installed in the preheating furnace flue gas inlet by bolts, and the preheating furnace flue gas outlet pipe is installed in the preheating furnace flue gas outlet by bolts.

[0017] Preferably, the heating structure includes a heating furnace roller conveyor, a heating furnace flue gas pipe, a pipe valve, a first flue gas pipe, and a second flue gas pipe. There are several heating furnace roller conveyors, each divided into two groups, movably mounted on the left and right inner walls of the heating furnace body via bearings. The top of the heating furnace roller conveyor is flush with the top of the inlet roller conveyor and the preheating furnace roller conveyor. The output shaft of the heating furnace feed motor is located inside the heating furnace body and is fixedly mounted with heating stepping wheels via bolts. Heating connecting arms are movably mounted on the heating stepping wheels via bearings, and a heating top material bed is fixedly mounted on the top of the heating connecting arms via bolts. There are several groups of heating stepping wheels and heating connecting arms. The top center of the heating furnace body has a heating furnace flue gas outlet. The bottom end of the heating furnace flue gas pipe is installed in the heating furnace flue gas outlet by bolts. The top of the heating furnace flue gas pipe is divided into two flue gas outlets to the left and right sides of the heating furnace body. There are two pipe valves, which are respectively bolted to the outside of the flue gas outlets. The first flue gas pipe is bolted to the middle of the side wall of a pipe valve near the furnace body conversion motor. The second flue gas pipe is bolted to the middle of the side wall of a pipe valve away from the furnace body conversion motor. Several burners are bolted to the top center of both the preheating furnace body and the heating furnace body.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] 1. This invention designs and installs multiple furnace bodies, separating the preheating furnace body from the heating furnace body. The high-temperature flue gas from the heating furnace body serves as the heat source for the preheating furnace body to preheat the steel billet. The flue gas temperature discharged from the preheating furnace body is the final flue gas temperature of the heating furnace body. A small number of burners can be arranged in the preheating furnace body as auxiliary heating and regulating burners, which is beneficial for accurately controlling the flue gas temperature of the heating furnace. The flue gas temperature can be controlled at the lower limit of the dew point corrosion-resistant temperature, thereby reducing energy consumption and preventing corrosion of the chimney.

[0020] 2. This invention separates the preheating furnace body from the heating furnace body. When producing steel grades that are prone to decarburization, rapid heating is required to minimize the time spent in the furnace. The steel can be directly fed into the heating furnace without going through the preheating furnace body, thus reducing heating time and preventing decarburization. When producing steel grades that require slow heating, the temperature can be slowly increased to above AC3 in the preheating furnace body to avoid hot cracking caused by rapid heating. When producing steel grades that require long-term diffusion of alloying elements, diffusion can be carried out in the preheating furnace body instead of stopping the furnace and holding it at a constant temperature in the heating furnace. This allows the billet to slowly heat up or diffuse for a long time in the preheating furnace body without needing to stop the heating furnace body to wait for the temperature to rise. In this case, the heating furnace body can simultaneously produce steel grades that do not require slow heating or long-term diffusion of alloying elements to ensure the continuity of production.

[0021] 3. This invention designs and installs a movable and separable preheating furnace body between the furnace loading platform and the heating furnace body. For old heating furnaces, a preheating furnace body can be added directly to increase the heating capacity. At the same time, it expands the range of steel grades that the heating furnace can produce and increases the heating capacity without the need to dismantle and rebuild the old heating furnace, thereby saving investment. By connecting the independent furnace bodies in series, it also makes it possible to use a continuous heating furnace to heat ultra-large cross-section steel billets that require long-term heating. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure provided for an embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the front section of the side cross-section structure provided in an embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of the rear section of the side cross-section structure provided in an embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of a partial internal structure of the preheating furnace body provided in an embodiment of the present invention;

[0026] Figure 5 Provided for embodiments of the present invention Figure 4 Enlarged structural diagram at point A in the middle;

[0027] Figure 6 This is a partial schematic diagram of the furnace body conversion transmission structure provided in an embodiment of the present invention;

[0028] Figure 7 This is a schematic diagram of the internal structure of the output wheel provided in an embodiment of the present invention.

[0029] In the diagram: 1. Furnace loading base; 2. Preheating base; 3. Heating base; 4. Furnace loading structure; 401. Fixed support rail; 402. Furnace loading platform; 403. Roller; 404. Furnace feed roller conveyor; 5. Preheating furnace installation structure; 501. Mounting plate; 502. Threaded rod; 503. Support slide bar; 504. Preheating furnace body; 505. Track support plate; 506. Movable support rail; 507. Translation slider; 6. Furnace body conversion transmission structure; 601. Transmission disc; 602. Slot; 603. Output wheel; 604. Locking post; 605. Spring; 606. Furnace body conversion motor; 607. First transmission belt; 608. Transmission wheel; 609. First bevel gear; 610. Second bevel gear; 611. Second transmission belt; 612. Transfer 613. Third transmission belt; 614. First transmission gear; 615. Slide groove; 616. First rack; 617. Second rack; 618. Second transmission gear; 619. Connecting rod; 620. Third transmission gear; 7. Stepping preheating structure; 701. Preheating furnace feed motor; 702. Preheating furnace stepping wheel; 703. Preheating furnace connecting arm; 704. Preheating furnace top material bed; 705. Preheating furnace roller conveyor; 706. Preheating furnace flue gas inlet pipe; 707. Preheating furnace flue gas outlet pipe; 8. Heating structure; 801. Heating furnace body; 802. Heating furnace feed motor; 803. Heating furnace roller conveyor; 804. Heating furnace flue gas outlet pipe; 805. Pipe valve; 806. First flue gas outlet pipe; 807. Second flue gas outlet pipe; 9. Burner. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Please see Figure 1-7 The present invention provides a technical solution: a multi-furnace series stepping continuous heating furnace, including a furnace loading base 1, a preheating base 2 is fixedly installed on the rear bottom end of the furnace loading base 1 by bolts, and a heating base 3 is fixedly installed on the rear side of the preheating base 2 by bolts.

[0032] The furnace loading structure 4 includes two fixed support rails 401, which are fixedly installed on both sides of the top of the furnace loading base 1 by bolts.

[0033] The preheating furnace installation structure 5 includes an installation plate 501, a threaded rod 502, and a support slide rod 503. The installation plate 501 is fixedly installed inside the preheating base 2 near the right end at one-third of the way. A connecting hole is opened in the middle of the installation plate 501. The threaded rod 502 is movably installed in the connecting hole through a bearing. The end of the threaded rod 502 away from the installation plate 501 is movably installed in the middle of the left inner wall of the preheating base 2 through a bearing. There are two support slide rods 503, which are equidistantly distributed on both sides of the threaded rod 502. The two ends of the two support slide rods 503 are respectively movably installed in the middle of the installation plate 501 and the inner wall of the preheating base 2 through bearings.

[0034] The furnace body conversion transmission structure 6 includes a transmission disc 601, a slot 602, an output wheel 603, and a locking post 604. The transmission disc 601 is fixedly installed on the right side of the threaded rod 502 by bolts. There are several slots 602, which are evenly arranged in a circle on the side of the transmission disc 601 away from the threaded rod 502. The output wheel 603 is movably sleeved on the outside of the transmission disc 601. There are several evenly arranged circular grooves in the output wheel 603. There are several locking posts 604, which are inserted and movably installed in the grooves.

[0035] The stepping preheating structure 7 includes a preheating furnace feeding and discharging motor 701 and a preheating furnace stepping wheel 702. There are four preheating furnace stepping wheels 702, which are divided into two groups. The output shaft of the preheating furnace feeding and discharging motor 701 is fixedly installed with a preheating furnace stepping wheel 702 that is far away from the furnace base 1 by bolts.

[0036] Heating structure 8 includes heating furnace body 801 and heating furnace feed motor 802. Heating furnace body 801 is fixedly installed on the top of heating base 3 by bolts, and heating furnace feed motor 802 is fixedly installed on the rear end of the side wall of heating furnace body 801 by bolts.

[0037] The furnace loading structure 4 includes a furnace loading platform 402, rollers 403, and furnace entry roller conveyor 404. The furnace loading platform 402 is slidably mounted on the top of the fixed support rail 401. Wheel grooves are provided on both sides of the bottom end of the furnace loading platform 402. There are several rollers 403, which are evenly divided into two groups and are movably mounted in the wheel grooves through bearings. There are several furnace entry roller conveyors 404, which are evenly divided into two groups and are movably mounted on the top of both sides of the furnace loading platform 402 through bearings. The rollers 403 enable the furnace loading platform 402 to move easily along the fixed support rail 401.

[0038] The preheating furnace installation structure 5 includes a preheating furnace body 504, a track support plate 505, movable support rails 506, and a sliding block 507. The preheating furnace body 504 is bolted to the top of the sliding block 507. The track support plate 505 is bolted to the bottom of the preheating furnace body 504 and is slidably connected to the top of the preheating base 2. There are two movable support rails 506, which are bolted to the top of the track support plate 505. The distance between the two movable support rails 506 is equal to the distance between the two fixed support rails 401. The top of the support rail 506 is flush with the top of the fixed support rail 401. The translation slider 507 has a threaded hole in the middle and sliding holes are equally spaced on both sides of the threaded hole. The threaded rod 502 is threaded into the threaded hole, and the support slider 503 is inserted and slidably installed in the sliding hole. The translation slider 507 is slidably connected between the preheating base 2 and the mounting plate 501. The cross-sectional length of the bottom end of the track support plate 505 is equal to the cross-sectional length of the top end of the translation slider 507, and each occupies one-third of the cross-sectional length of the bottom end of the preheating base 2. The steel billet is preheated through the preheating furnace body 504.

[0039] The furnace body conversion transmission structure 6 includes springs 605, a furnace body conversion motor 606, a first transmission belt 607, a transmission pulley 608, a first bevel gear 609, and a second bevel gear 610. Several springs 605 are bolted to the bottom of the locking post 604 and the bottom of the slot inside the post. The locking post 604 engages with the slot 602. The furnace body conversion motor 606 is bolted to the bottom of the preheating base 2. The output shaft of the furnace body conversion motor 606 is bolted to the middle of the output pulley 603 on the side away from the slot 602. A pulley is bolted to the output shaft of the furnace body conversion motor 606. The first transmission belt 607 is movably sleeved on the outside of the pulley. The transmission wheel 608 is movably mounted on the side of the mounting plate 501 away from the threaded rod 502 via a bearing. The other end of the first transmission belt 607 is movably sleeved on the outside of the transmission wheel 608. The first bevel gear 609 is fixedly mounted on the middle of the side of the transmission wheel 608 away from the mounting plate 501 by bolts. The first bevel gear 609 is movably mounted on the bottom inside of the preheating base 2 via a bearing. The second bevel gear 610 meshes with the first bevel gear 609 at the bottom end. The furnace body conversion motor 606 provides power for the movement of the preheating furnace body 504 and the furnace mounting frame 402.

[0040] The furnace body conversion transmission structure 6 includes a second transmission belt 611, a central rotating pulley 612, a third transmission belt 613, a first transmission gear 614, and a sliding groove 615. The second transmission belt 611 is movably sleeved on the bottom end of the second bevel gear 610. A mounting bracket is fixedly installed on the side of the preheating base 2 near the furnace loading base 1 by bolts. The central rotating pulley 612 is movably mounted on the mounting bracket by bearings. The other end of the second transmission belt 611 is movably sleeved on the bottom end of the central rotating pulley 612. The third transmission belt 613 is movably sleeved on the top end of the central rotating pulley 612. A gear plate is fixedly installed on the side of the preheating base 2 near the furnace loading base 1 by bolts. The first transmission gear 614 is movably mounted on the top end of the gear plate by bearings. The other end of the third transmission belt 613 is movably sleeved on the bottom end of the first transmission gear 614. The sliding groove 615 is fixedly installed between the bottom ends of the furnace loading base 1 and the preheating base 2 by bolts. The power of the furnace body conversion motor 606 is transmitted to the first transmission gear 614 through the central rotating pulley 612.

[0041] The furnace body conversion transmission structure 6 includes a first rack 616, a second rack 617, a second transmission gear 618, a connecting rod 619, and a third transmission gear 620. The first rack 616 is inserted and slidably installed in the slide groove 615. The first rack 616 has internal toothed grooves on the side near the preheating base 2, and external toothed grooves on the side of the first rack 616 near the furnace loading base 1 and one-third of the way from the right side of the preheating base 2. The second rack 617 is fixedly installed on the bottom end of the furnace loading platform 402 near the first transmission gear 614 by bolts. The drive gear 618 meshes with the second rack 617. The connecting rod 619 is fixedly installed at the bottom end of the second drive gear 618 by bolts. A connecting block is fixedly installed on the side of the slide groove 615 near the furnace base 1 by bolts. The connecting rod 619 is inserted into the connecting block by bearings. The third drive gear 620 is fixedly installed at the bottom end of the connecting rod 619 by bolts. The third drive gear 620 meshes with the outer tooth groove of the first rack 616. After the preheating furnace body 504 stops moving due to the first rack 616, the furnace platform 402 moves again.

[0042] The stepping preheating structure 7 includes four preheating furnace connecting arms 703, a preheating furnace top material bed 704, a preheating furnace roller conveyor 705, a preheating furnace flue gas inlet pipe 706, and a preheating furnace flue gas outlet pipe 707. The bottom ends of the four connecting arms 703 are movably mounted on the side of the preheating furnace stepping wheel 702 away from the preheating furnace feed motor 701 via bearings, and are located away from the center of the preheating furnace stepping wheel 702. The top ends of the connecting arms 703 are fixed to the left and right bottom ends of the preheating furnace top material bed 704 by bolts. Several preheating furnace roller conveyors 705 are divided into two groups and evenly mounted on the left and right inner walls of the preheating furnace body 504 via bearings. The top of each of the 05 is flush with the top of the feed roller 404. The top material bed 704 of the preheating furnace is located between the two sets of preheating furnace rollers 705. The preheating furnace walking wheel 702 is welded with a linkage gear on the side near the inner wall of the preheating furnace body 504, and a chain is sleeved on the two linkage gears on the same side. The preheating furnace flue gas outlet is opened on the left side of the top of the preheating furnace body 504, and the preheating furnace flue gas inlet is opened on the right side of the top of the preheating furnace body 504. The preheating furnace flue gas inlet pipe 706 is installed in the preheating furnace flue gas inlet by bolts, and the preheating furnace flue gas outlet pipe 707 is installed in the preheating furnace flue gas outlet by bolts. The preheating furnace walking wheel 702 drives the preheating furnace connecting arm 703 to maintain a vertical state and perform circular motion.

[0043] The heating structure 8 includes a heating furnace roller conveyor 803, a heating furnace flue gas pipe 804, a pipe valve 805, a first flue gas pipe 806, and a second flue gas pipe 807. There are several heating furnace roller conveyors 803, evenly divided into two groups, which are movably mounted on the left and right inner walls of the heating furnace body 801 via bearings. The top of the heating furnace roller conveyor 803 is flush with the top of the inlet roller conveyor 404 and the preheating furnace roller conveyor 705. The output shaft of the heating furnace feed motor 802 is located inside the heating furnace body 801 and is fixedly mounted with heating stepping wheels via bolts. Heating connecting arms are movably mounted on the heating stepping wheels via bearings, and a heating top material bed is fixedly mounted on the top of the heating connecting arms via bolts. There are several groups of heating stepping wheels and heating connecting arms. A heating furnace flue gas outlet is opened in the middle of the top of the heating furnace body 801. The bottom end of the flue gas outlet pipe 804 is bolted into the flue gas outlet of the heating furnace. The top end of the flue gas outlet pipe 804 is divided into two flue gas outlets on the left and right sides of the heating furnace body 801. There are two pipe valves 805, which are bolted to the outside of the flue gas outlets. The first flue gas outlet pipe 806 is bolted into the middle of the side wall of the pipe valve 805 near the furnace body conversion motor 606. The second flue gas outlet pipe 807 is bolted into the middle of the side wall of the pipe valve 805 away from the furnace body conversion motor 606. Several burners 9 are bolted into the middle of the top of both the preheating furnace body 504 and the heating furnace body 801. The heating furnace feed motor 802 causes the steel billet to move step by step inside the heating furnace body 801, and the pipe valves 805 control the direction of the high-temperature flue gas.

[0044] Working Principle: When using this invention, for steel grades that require slow heating and are prone to cracking when heated too quickly, the steel billet is first transported from the loading platform 402 into the preheating furnace body 504 via the furnace feed roller conveyor 404. After the steel billet enters the preheating furnace body 504, the preheating furnace feed motor 701 is started. The preheating furnace feed motor 701 drives the preheating furnace walking wheel 702 to rotate. The linkage gear follows the preheating furnace walking wheel 702 for transmission, and the chain drives the preheating furnace feed motor 702. The preheating furnace walking wheel 702 on one side of machine 701 rotates simultaneously. When the preheating furnace walking wheel 702 rotates, the preheating furnace connecting arm 703 remains vertical and performs circular motion. The preheating furnace connecting arm 703 drives the preheating furnace top material bed 704 to perform circular motion. After the preheating furnace top material bed 704 lifts the billet, it moves downward in a circular motion towards the heating furnace body 801. When the billet moves to the preheating furnace roller conveyor 705, it is blocked by the preheating furnace roller conveyor 705, and then it continues to move towards the heating furnace body 801 repeatedly. This allows the steel billet to move in a step-by-step manner inside the preheating furnace body 504. Simultaneously, as the billet moves within the preheating furnace body 504, a pipe valve 805 near the furnace body conversion motor 606 is opened. This allows the high-temperature flue gas inside the heating furnace body 801 to enter the first flue gas outlet pipe 806 through the heating furnace flue gas outlet pipe 804, and then enter the preheating furnace body 504 through the preheating furnace flue gas inlet pipe 706. This fully utilizes the high-temperature flue gas from the heating furnace body 801 to preheat the steel billet, further enhanced by a small number of burners 9. The steel billet inside the furnace body 504 is slowly heated to a temperature above the AC3 line, so that the steel billet can slowly heat up in the preheating furnace body 504 according to the predetermined heating curve, thereby ensuring the heating quality. Then, the steel billet is sent out of the preheating furnace body 504 through the preheating furnace top material bed 704, so that the preheated steel billet enters the heating furnace body 801. The steel billet is heated by the burners 9 in the heating furnace body 801 until it reaches the required rolling temperature. Then, it is output to the subsequent rolling stage through the heating furnace roller table 803.

[0045] When producing products prone to decarburization, rapid heating with minimal heating time is required. In this case, preheating the steel billet in the preheating furnace body 504 can be omitted, and the steel billet on the loading rack 402 will no longer enter the preheating furnace body 504. To achieve this, the furnace body conversion motor 606 needs to be started first. The furnace body conversion motor 606 drives the output wheel 603 to rotate. Since the locking pin 604 and the locking slot 602 are engaged, the output wheel 603 drives the transmission disc 601 to rotate through the locking pin 604. When the transmission disc 601 rotates, it drives the threaded rod 502 to rotate. Since the threaded rod 502 is threadedly connected to the translation slider 507, under the limiting action of the support slider 503, the translation slider 507 drives the preheating furnace body 504, the track support plate 505, and the movable support. The movable support rail 506 moves together towards the end of the preheating base 2 away from the furnace body conversion motor 606. When the movable support rail 506 is aligned with the fixed support rail 401, the translation slider 507 drives the preheating furnace body 504 to move to the end of the preheating base 2 away from the furnace body conversion motor 606. When the furnace body conversion motor 606 starts to rotate, it drives the transmission wheel 608 to rotate through the first transmission belt 607. When the transmission wheel 608 rotates, it drives the first bevel gear 609 to rotate, which in turn drives the second bevel gear 610 to rotate. When the second bevel gear 610 rotates, it drives the intermediate rotating wheel 612 to rotate through the second transmission belt 611, and then drives the first transmission gear 614 to rotate through the third transmission belt 613. When the first transmission gear 61... 4. When rotating, it drives the first rack 616 to move in the slide groove 615 towards the end of the preheating base 2 away from the furnace body conversion motor 606. When the preheating furnace body 504 stops moving, the furnace body conversion motor 606 provides power, causing the locking pin 604 to move outward in the locking groove 602. At this time, the locking pin 604 is squeezed into the output wheel 603, and the spring 605 is compressed. This allows the furnace body conversion motor 606 to continue driving the pulley to rotate when the threaded rod 502 and the transmission disc 601 stop rotating simultaneously, so that the first transmission gear 614 continues to rotate. When the preheating furnace body 504 stops moving, the first rack 616 has moved exactly two-thirds of the way. At this time, the outer tooth groove of the first rack 616 moves to the position of the third transmission gear 620. As rack 616 continues to move under the drive of first transmission gear 614, its outer tooth groove drives third transmission gear 620 to rotate. When third transmission gear 620 rotates, it drives second transmission gear 618 to rotate via connecting rod 619. When second transmission gear 618 rotates, it drives second rack 617 to move towards heating furnace body 801. Second rack 617 drives furnace loading platform 402 to move towards heating furnace body 801. Rollers 403 move along fixed support rail 401 and movable support rail 506, causing furnace loading platform 402 to move to the top center of preheating base 2. At this time, furnace loading platform 402 is in the original position of preheating furnace body 504, so that steel billets are transported from furnace entry roller 404 onto heating furnace roller 803 on heating furnace body 801.This allows the steel billets to be heated directly without prior heat treatment, significantly reducing heating time and effectively preventing decarburization. During this time, the preheating furnace 504 can continue to store steel billets requiring extended furnace time. When the preheating furnace 504 moves away from the heating furnace 801, the preheating furnace inlet pipe 706 moves from the first outlet pipe 806 to the second outlet pipe 807. After the second outlet pipe 807 is closed, the high-temperature flue gas from the heating furnace 801 enters the preheating furnace 504 through the heating furnace outlet pipe 804, the second outlet pipe 807, and the preheating furnace inlet pipe 706. After the burners 9 in the preheating furnace 504 are closed, the steel billets are preheated solely by the high-temperature flue gas to save energy.

[0046] When producing steel billets that can be hot-charged, the above process is also used so that the steel billets do not need to use the preheating furnace body 504 to shorten the heating time and reduce burn-off. When the preheating furnace body 504 is used again for the preheating process, the preheating furnace body 504 and the loading platform 402 can be reset by controlling the furnace body conversion motor 606 to reverse. For production lines with heating capacity far lower than rolling capacity, the following methods can be used: adding a loading structure 4, a preheating furnace installation structure 5, a furnace body conversion transmission structure 6, and a stepping preheating structure 7. The temperature of the steel billets entering the heating furnace body 801 can be increased by preheating the preheating furnace body 504, thereby significantly increasing the heating capacity of the heating furnace body 801 with a relatively small investment to meet the rolling capacity of the rolling line.

[0047] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0048] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multi-furnace series walking beam continuous heating furnace, comprising a furnace loading base (1), wherein a preheating base (2) is fixedly installed at the rear bottom end of the furnace loading base (1), and a heating base (3) is fixedly installed at the rear side of the preheating base (2), characterized in that: The furnace loading structure (4) includes a fixed support rail (401), which consists of two rails and is fixedly installed on both sides of the top of the furnace loading base (1). The preheating furnace installation structure (5) includes an installation plate (501), a threaded rod (502), and a support slide rod (503). The installation plate (501) is fixedly installed inside the preheating base (2) at one-third of the right end. A connection hole is provided in the middle of the installation plate (501). The threaded rod (502) is movably installed in the connection hole. One end of the threaded rod (502) away from the installation plate (501) is movably installed in the middle of the left inner wall of the preheating base (2). There are two support slide rods (503) and they are equidistantly distributed on both sides of the threaded rod (502). The two ends of the two support slide rods (503) are movably installed in the middle of the inner wall of the installation plate (501) and the preheating base (2), respectively. The furnace body conversion transmission structure (6) includes a transmission disc (601), a slot (602), an output wheel (603), and a locking post (604). The transmission disc (601) is fixedly installed on the right side of the threaded rod (502). There are several slots (602) arranged in a circular pattern on the side of the transmission disc (601) away from the threaded rod (502). The output wheel (603) is movably sleeved on the outside of the transmission disc (601). There are several uniformly arranged circular grooves in the output wheel (603). There are several locking posts (604) movably installed in the grooves. The stepping preheating structure (7) includes a preheating furnace feeding and discharging motor (701) and a preheating furnace stepping wheel (702). There are four preheating furnace stepping wheels (702) in total, which are divided into two groups. The output shaft of the preheating furnace feeding and discharging motor (701) is fixedly connected to one preheating furnace stepping wheel (702) that is away from the furnace base (1). Heating structure (8), the heating structure (8) includes a heating furnace body (801) and a heating furnace feed motor (802). The heating furnace body (801) is fixedly installed on the top of the heating base (3), and the heating furnace feed motor (802) is fixedly installed on the rear end of the side wall of the heating furnace body (801).

2. The multi-furnace series walking beam continuous heating furnace according to claim 1, characterized in that: The furnace loading structure (4) includes a furnace loading platform (402), rollers (403) and furnace entry roller conveyor (404). The furnace loading platform (402) is engaged and slidably mounted on the top of a fixed support rail (401). Wheel grooves are provided on both sides of the bottom end of the furnace loading platform (402). There are several rollers (403) and they are evenly divided into two groups and are movably mounted in the wheel grooves through bearings. There are several furnace entry roller conveyors (404) and they are evenly divided into two groups and are movably mounted on the top of both sides of the two furnace loading platforms (402) through bearings.

3. A multi-furnace series walking beam continuous heating furnace according to claim 2, characterized in that: The preheating furnace installation structure (5) includes a preheating furnace body (504), a track support plate (505), movable support rails (506), and a translation slider (507). The preheating furnace body (504) is fixedly installed on the top of the translation slider (507) by bolts. The track support plate (505) is fixedly installed on the bottom of the preheating furnace body (504) by bolts. The track support plate (505) is slidably connected to the top of the preheating base (2). There are two movable support rails (506) fixedly installed on the top of the track support plate (505) by bolts. The distance between the two movable support rails (506) is the same as that between the two fixed support rails (507). The spacing of the 401) is equal, and the top of the movable support rail (506) is flush with the top of the fixed support rail (401). The translation slider (507) has a threaded hole in the middle, and sliding holes are equally spaced on both sides of the threaded hole. The threaded rod (502) is threaded in the threaded hole, and the support slide rod (503) is inserted and slidably installed in the sliding hole. The translation slider (507) is slidably connected between the preheating base (2) and the mounting plate (501). The cross-sectional length of the bottom end of the track support plate (505) is equal to the cross-sectional length of the top end of the translation slider (507), and each occupies one-third of the cross-sectional length of the bottom end of the preheating base (2).

4. A multi-furnace series walking beam continuous heating furnace according to claim 3, characterized in that: The furnace body conversion transmission structure (6) includes springs (605), a furnace body conversion motor (606), a first transmission belt (607), a transmission wheel (608), a first bevel gear (609), and a second bevel gear (610). Several springs (605) are fixedly installed at the bottom of the locking post (604) and the bottom of the groove. The locking post (604) engages with the groove (602). The furnace body conversion motor (606) is fixedly installed at the bottom of the preheating base (2) by bolts. The output shaft of the furnace body conversion motor (606) is fixedly installed by bolts on the middle of the output wheel (603) on the side away from the groove (602). A pulley is fixedly mounted on the output shaft of the first transmission belt (607) by bolts. The first transmission belt (607) is movably sleeved on the outside of the pulley. The transmission wheel (608) is movably mounted on the side of the mounting plate (501) away from the threaded rod (502) by bearings. The other end of the first transmission belt (607) is movably sleeved on the outside of the transmission wheel (608). The first bevel gear (609) is fixedly mounted on the middle of the side of the transmission wheel (608) away from the mounting plate (501) by bolts. The first bevel gear (609) is movably mounted on the bottom inside of the preheating base (2) by bearings. The second bevel gear (610) meshes with the first bevel gear (609) at the bottom end of the first bevel gear (609).

5. A multi-furnace series walking beam continuous heating furnace according to claim 4, characterized in that: The furnace body conversion transmission structure (6) includes a second transmission belt (611), a central rotating wheel (612), a third transmission belt (613), a first transmission gear (614), and a slide (615). The second transmission belt (611) is movably sleeved on the bottom end of the second bevel gear (610). The preheating base (2) is fixedly mounted with a mounting bracket by bolts on the side near the furnace loading base (1). The central rotating wheel (612) is movably mounted on the mounting bracket by bearings. The other end of the second transmission belt (611) is movably sleeved on the slide (615). At the bottom end of the intermediate rotating wheel (612), the third transmission belt (613) is movably sleeved on the top end of the intermediate rotating wheel (612). The preheating base (2) is fixedly mounted on the side of the furnace loading base (1) by bolts. The first transmission gear (614) is movably mounted on the top end of the gear plate by bearings. The other end of the third transmission belt (613) is movably sleeved on the bottom end of the first transmission gear (614). The slide groove (615) is fixedly mounted between the bottom ends of the furnace loading base (1) and the preheating base (2) by bolts.

6. A multi-furnace series walking beam continuous heating furnace according to claim 5, characterized in that: The furnace body conversion transmission structure (6) includes a first rack (616), a second rack (617), a second transmission gear (618), a connecting rod (619), and a third transmission gear (620). The first rack (616) is inserted and slidably installed in the slide groove (615). The first rack (616) has internal tooth grooves on the side near the preheating base (2). The first rack (616) has external tooth grooves on the side near the furnace loading base (1) and one-third of the way from the right side of the preheating base (2). The second rack (617) is fixedly installed on the furnace loading platform (402) by bolts. Near the bottom end of the first transmission gear (614), the second transmission gear (618) meshes with the second rack (617). The connecting rod (619) is fixedly installed at the bottom end of the second transmission gear (618) by bolts. A connecting block is fixedly installed on the side of the slide groove (615) near the furnace base (1) by bolts. The connecting rod (619) is inserted into the connecting block by bearings. The third transmission gear (620) is fixedly installed at the bottom end of the connecting rod (619) by bolts. The third transmission gear (620) meshes with the outer tooth groove of the first rack (616).

7. A multi-furnace series walking beam continuous heating furnace according to claim 6, characterized in that: The step-type preheating structure (7) includes a preheating furnace connecting arm (703), a preheating furnace top material bed (704), a preheating furnace roller conveyor (705), a preheating furnace flue gas inlet pipe (706), and a preheating furnace flue gas outlet pipe (707). There are four preheating furnace connecting arms (703), and the bottom ends of each arm are movably mounted on the side of the preheating furnace stepping wheel (702) away from the preheating furnace feed motor (701) via bearings, and are located away from the center of the preheating furnace stepping wheel (702). The top ends of the preheating furnace connecting arms (703) are fixedly mounted on the left and right bottom ends of the preheating furnace top material bed (704) by bolts. There are several preheating furnace roller conveyors (705), which are evenly mounted on the preheating furnace top material bed (704) via bearings in two groups. The top of the left and right inner walls of the furnace body (504) and the top of the preheating furnace roller conveyor (705) are flush with the top of the furnace inlet roller conveyor (404). The preheating furnace top material bed (704) is located between the two sets of preheating furnace roller conveyors (705). The preheating furnace walking wheel (702) is welded with a linkage gear on the side near the inner wall of the preheating furnace body (504), and a chain is sleeved on the two linkage gears on the same side. The preheating furnace flue gas outlet is opened on the left side of the top of the preheating furnace body (504), and the preheating furnace flue gas inlet is opened on the right side of the top of the preheating furnace body (504). The preheating furnace flue gas inlet pipe (706) is installed in the preheating furnace flue gas inlet by bolts, and the preheating furnace flue gas outlet pipe (707) is installed in the preheating furnace flue gas outlet by bolts.

8. A multi-furnace series walking beam continuous heating furnace according to claim 7, characterized in that: The heating structure (8) includes a heating furnace roller conveyor (803), a heating furnace flue gas pipe (804), a pipe valve (805), a first flue gas pipe (806), and a second flue gas pipe (807). The heating furnace roller conveyor (803) consists of several units, divided into two groups, and is movably mounted on the left and right inner walls of the heating furnace body (801) via bearings. The top of the heating furnace roller conveyor (803) is flush with the top of the inlet roller conveyor (404) and the preheating furnace roller conveyor (705). The output shaft of the heating furnace feed motor (802) is located inside the heating furnace body (801) and is fixedly mounted with a heating stepping wheel via bolts. A heating connecting arm is movably mounted on the heating stepping wheel via bearings, and a heating top material bed is fixedly mounted on the top of the heating connecting arm via bolts. There are several groups of heating stepping wheels and heating connecting arms. A heating furnace flue gas outlet is provided at the top center of the body (801). The bottom end of the heating furnace flue gas pipe (804) is installed in the heating furnace flue gas outlet by bolts. The top of the heating furnace flue gas pipe (804) is divided into two flue gas outlets to the left and right sides of the heating furnace body (801). There are two pipe valves (805), which are respectively bolted to the outside of the flue gas outlets. The first flue gas pipe (806) is bolted to the middle of the side wall of a pipe valve (805) near the furnace body conversion motor (606). The second flue gas pipe (807) is bolted to the middle of the side wall of a pipe valve (805) away from the furnace body conversion motor (606). Several burners (9) are bolted to the middle of the top center of both the preheating furnace body (504) and the heating furnace body (801).

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