Energy-saving steel rolling heating furnace

Abstract

The invention discloses an energy-saving steel rolling heating furnace, and relates to the technical field of steel processing equipment, the energy-saving steel rolling heating furnace comprises a heating furnace body, a furnace door is slidably mounted on the front side of the heating furnace body, a waste heat utilization mechanism is fixedly connected to the top of the heating furnace body, and connecting mechanisms are fixedly connected to the front side and the rear side of the top of the waste heat utilization mechanism; and a fuel gas conveying pipe is fixedly mounted at the top end of the connecting mechanism. When a heating furnace body is closed through a closing baffle, a second motor is started to drive a first screw to rotate, so that a threaded sliding plate can be driven to slide along a guide column, and a sealing clamping ring can be pushed to slide through a push rod, so that the sealing clamping ring can be clamped into a sealing clamping groove; according to the heating furnace, the closing effect on the heating furnace body can be better, so that the heating furnace body is effectively sealed, heat loss is avoided, and the efficient and energy-saving effects of the heating furnace are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of steel processing equipment, and in particular to an energy-saving steel rolling heating furnace. Background Art

[0002] Rebar, also widely known as hot-rolled ribbed steel bars, is a type of steel commonly used in the construction and engineering fields. During the production process, this type of steel must undergo a hot rolling process. Specifically, during the hot rolling process, the rebar needs to be sent into a heating furnace for high-temperature heating before it can achieve the required plastic deformation.

[0003] The existing technology has the following problems:

[0004] When the existing heating furnace for rolling rebar is in use, the heating furnace is closed through the furnace door, but the sealing effect of the furnace door on the heating furnace is poor, which easily causes heat loss when the rebar is heated. At the same time, when the existing heating furnace for rolling rebar is in use, the exhaust gas in the heating process is directly discharged, and the residual heat in the exhaust gas cannot be effectively utilized, resulting in energy waste. At the same time, the existing heating furnace for rolling rebar is connected to the gas transmission pipe, and the connection process is relatively cumbersome, which is not conducive to the use of the heating furnace for rolling rebar. Summary of the invention

[0005] The present invention provides an energy-saving steel rolling heating furnace to solve the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] An energy-saving steel rolling heating furnace comprises a heating furnace body, a furnace door is slidably installed on the front side of the heating furnace body, a waste heat utilization mechanism is fixedly connected to the top of the heating furnace body, connecting mechanisms are fixedly connected to the front and rear sides of the top of the waste heat utilization mechanism, and a gas delivery pipe is fixedly installed on the top of the connecting mechanism.

[0008] The furnace door includes a closing baffle, which is slidably connected to the front side of the heating furnace body, and the closing baffle includes a sliding baffle, a sliding groove 1 is opened inside the sliding baffle, and a second motor is fixedly installed in the middle of the sliding groove 1, and the upper and lower output shafts of the second motor are fixedly connected to the first screw, and the outer surface of the first screw is threadedly connected to the threaded slide, and the left and right sides of the interior of the threaded slide are slidably connected to guide columns penetrating up and down, and the guide column is fixedly connected to the inside of the sliding groove 1, and the left and right sides of the side of the threaded slide away from the second motor are movably connected to push rods, and one end of the four push rods away from the threaded slide is movably connected to a sealing clamp ring, and a sealing clamp groove is opened at the lower front side of the heating furnace body, and the outer surface of the sealing clamp ring is slidably connected to the inner surface of the sliding groove 1 and the rear end penetrates into the interior of the sealing clamp groove.

[0009] The waste heat utilization mechanism includes a connecting box, which is fixedly connected to the top of the heating furnace body, and the two connecting mechanisms are respectively fixedly connected to the front and rear sides of the top of the connecting box, and the middle part of the connecting box is fixedly connected with an exhaust gas exhaust pipe that passes through the front and rear, and the front end of the exhaust gas exhaust pipe is fixedly connected to the front and rear sides of the interior of the connecting box. The connecting pipe is fixedly connected to the bottom of the connecting mechanism and the middle part is fixedly connected with a preheating sleeve, and the outer surface of the preheating sleeve is fixedly connected to the middle part of the exhaust gas exhaust pipe. The preheating sleeve includes a metal heat conducting pipe, which is fixedly connected to the middle part of the conducting pipe, and the outer surface of the metal heat conducting pipe is fixedly connected to a heat insulating pipe, and vortex heating grooves are provided on the upper and lower sides of the interior of the metal heat conducting pipe, and an air inlet groove is provided at the front end of the two vortex heating grooves, and the air inlet groove is communicated with the front side of the exhaust gas exhaust pipe, and an exhaust groove is provided at the rear end of the vortex heating groove, and the exhaust groove is communicated with the rear side of the exhaust gas exhaust pipe.

[0010] A further improvement of the technical solution of the present invention is that the furnace door includes a first motor, and movable grooves are opened on both sides of the left and right sides of the front top of the heating furnace body. The first motor is fixedly installed inside the movable groove, and the output shaft of the first motor is fixedly connected to a driving wheel, and the outer surface of the driving wheel is meshingly connected to a driven wheel.

[0011] A further improvement of the technical solution of the present invention is that a threaded collar penetrating up and down is fixedly connected to the middle of the driven wheel, a lifting stud penetrating up and down is threadedly connected to the inner surface of the threaded collar, and the bottom end of the lifting stud is fixedly connected to the top end of the closing baffle.

[0012] A further improvement of the technical solution of the present invention is that: a connecting plug is fixedly connected to the bottom end of the gas delivery pipe, a sealing ring is slidably connected above the outer surface of the connecting plug, an annular groove is provided below the outer surface of the connecting plug, the connecting mechanism includes a connecting sleeve, the connecting sleeve is fixedly connected to the top of the waste heat utilization mechanism, and the connecting plug is slidably inserted into the inner surface of the connecting sleeve.

[0013] A further improvement of the technical solution of the present invention is that an annular groove is provided on the outer surface of the connecting sleeve, an inner threaded rotating ring is rotatably connected to the outer side of the annular groove, an outer threaded sliding ring is threadedly connected to the inner surface of the inner threaded rotating ring, the outer threaded sliding ring is slidably connected to the inside of the annular groove, and sliding grooves 2 are provided on both sides of the inner surface of the annular groove, and the sliding grooves 2 penetrate to the inner surface of the connecting sleeve.

[0014] A further improvement of the technical solution of the present invention is that: the left and right sides of the inner surface of the external threaded sliding ring are fixedly connected with limiting slides, the limiting slide is slidably connected to the inside of the sliding groove 2, the middle part of the limiting slide is movably connected with a transmission wheel that passes through the front and rear, the rear side of the transmission wheel is meshedly connected with a transmission rack, and the transmission rack is fixedly connected to the rear surface of the sliding groove 2.

[0015] A further improvement of the technical solution of the present invention is that a second screw is fixedly connected to the side of the transmission wheel away from the external threaded sliding ring, an end of the second screw away from the transmission wheel penetrates to the outside of the transmission wheel and a threaded slider is threadedly connected to the outer surface, a fixed sleeve is slidably connected to the outer surface of the threaded slider, the outer surface of the fixed sleeve is slidably connected to the inner surface of the sliding groove 2 and the end away from the transmission wheel penetrates to the inside of the annular groove.

[0016] A further improvement of the technical solution of the present invention is that two limit slide bars are fixedly connected to the front and rear sides of the threaded slider, two limit slide grooves are provided on the front and rear sides of the inner surface of the fixed sleeve, and the limit slide bars are slidably connected inside the limit slide grooves.

[0017] Due to the adoption of the above technical solution, the present invention has the following technical advances compared with the prior art:

[0018] 1. The present invention provides an energy-saving steel rolling heating furnace. Through the mutual cooperation among the sliding baffle, the second motor, the first screw, the threaded slide plate, the guide column, the pushing rod and the sealing clip ring, when the heating furnace body is closed by the closing baffle, the second motor can be started to drive the first screw rod to rotate, thereby driving the threaded slide plate to slide along the guide column, so that the sealing clip ring can be pushed to slide by the pushing rod, so that the sealing clip ring can be stuck into the inside of the sealing slot, which can make the closing effect of the heating furnace body better, thereby effectively sealing the heating furnace body, avoiding heat loss, and achieving high efficiency and energy-saving effects of the heating furnace.

[0019] 2. The present invention provides an energy-saving steel rolling heating furnace. Through the mutual cooperation among a connecting box, an exhaust gas discharge pipe, a conducting pipe, a metal heat conducting pipe, an insulating pipe, a vortex heating tank, an air intake tank, and an exhaust tank, when the exhaust gas in the heating furnace is discharged through the exhaust gas discharge pipe, the high-temperature exhaust gas will enter the vortex heating tank through the air intake tank, thereby heating the metal heat conducting pipe and preheating the fuel gas passing through the conducting pipe and the metal heat conducting pipe, so that the fuel gas can reach a higher temperature before entering the heating furnace. This preheating process significantly improves the thermal efficiency of the heating furnace, because the preheated fuel gas can reach the required combustion temperature more quickly during combustion, thereby shortening the heating time and reducing energy consumption.

[0020] 3. The present invention provides an energy-saving steel rolling heating furnace. Through the mutual cooperation among the connecting sleeve, the internal thread rotating ring, the external thread sliding ring, the limiting slide plate, the transmission wheel, the transmission rack, the second screw, the threaded slider, the fixed sleeve plate and the limiting slide bar, when the heating furnace is connected to the gas pipeline, the connecting pipe will be inserted into the interior of the connecting sleeve. By rotating the internal thread rotating ring, the external thread sliding ring can drive the limiting slide plate to slide, so that the second screw can be rotated under the meshing transmission of the transmission rack of the transmission wheel, so that the fixed sleeve plate can be pushed into the interior of the annular groove through the threaded slider, thereby realizing the connection between the heating furnace and the gas pipeline, improving the connection effect, and making the use of the threaded steel rolling heating furnace more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the present invention;

[0022] Figure 2 It is a structural schematic diagram of the furnace door of the present invention;

[0023] Figure 3 It is a schematic diagram of the cross-sectional structure of the closed baffle of the present invention;

[0024] Figure 4 It is a schematic cross-sectional structure diagram of the waste heat utilization mechanism of the present invention;

[0025] Figure 5 It is a schematic diagram of the cross-sectional structure of the preheating sleeve of the present invention;

[0026] Figure 6 It is a schematic cross-sectional structure diagram of the connection mechanism of the present invention;

[0027] Figure 7 It is an enlarged structural schematic diagram of the fixed sleeve plate of the present invention.

[0028] In the figure: 1. Heating furnace body; 11. Sealing card slot; 2. Furnace door; 21. First motor; 22. Driving wheel; 23. Driven wheel; 24. Threaded collar; 25. Lifting stud; 26. Closing baffle; 261. Sliding baffle; 262. Second motor; 263. First screw; 264. Threaded slide plate; 265. Guide column; 266. Push rod; 267. Sealing card ring; 3. Waste heat utilization mechanism; 31. Connecting box; 32. Waste gas discharge pipe; 33. Conducting pipe; 34. Preheating sleeve; 341. Metal heat conduction pipe; 342. Insulating pipe; 343. Vortex heating groove; 344. Intake groove; 345. Exhaust groove; 4. Connecting mechanism; 41. Connecting sleeve; 42. Internal thread rotating ring; 43. External thread sliding ring; 44. Limiting slide plate; 45. Transmission wheel;

[0029] 46. ​​Transmission rack; 47. Second screw rod; 48. Threaded slider; 49. Fixed sleeve;

[0030] 410, limit slide bar; 411, limit slide groove; 5, gas delivery pipe; 51, connecting plug; 52, sealing ring; 53, annular groove. DETAILED DESCRIPTION

[0031] The present invention is further described in detail below in conjunction with embodiments:

[0032] Example 1

[0033] like Figure 1-3As shown, the present invention provides an energy-saving steel rolling heating furnace, including a heating furnace body 1, a furnace door 2 is slidably installed on the front side of the heating furnace body 1, a waste heat utilization mechanism 3 is fixedly connected to the top of the heating furnace body 1, and a connecting mechanism 4 is fixedly connected to the front and rear sides of the top of the waste heat utilization mechanism 3, and a gas delivery pipe 5 is fixedly installed on the top of the connecting mechanism 4. For the two gas delivery pipes 5, one is used to deliver gas and the other is used to deliver combustion-supporting gas. The furnace door 2 includes a closing baffle 26, which is slidably connected to the front side of the heating furnace body 1, and the closing baffle 26 includes a sliding baffle 261. A sliding groove 1 is opened inside the sliding baffle 261, and a second motor 262 is fixedly installed in the middle of the sliding groove 1. The output shafts of the second motor 262 at both upper and lower ends are fixedly connected with a first screw 263, and the outer surface of the first screw 263 is threadedly connected with a threaded slide 264, and the left and right sides of the inside of the threaded slide 264 are slidably connected with guide columns 265 that penetrate up and down, and the guide The column 265 is fixedly connected to the inside of the sliding groove 1, and the left and right sides of the side of the threaded slide 264 away from the second motor 262 are movably connected with push rods 266. One end of the four push rods 266 away from the threaded slide 264 is movably connected with a sealing clamp ring 267. A sealing clamp groove 11 is opened at the lower front side of the heating furnace body 1. The outer surface of the sealing clamp ring 267 is slidably connected to the inner surface of the sliding groove 1 and the rear end passes through the inside of the sealing clamp groove 11. The furnace door 2 includes a first motor 21. The left and right sides of the front top of the heating furnace body 1 are opened. The first motor 21 is fixedly installed in the inside of the movable groove 1. The output shaft of the first motor 21 is fixedly connected with a driving wheel 22. The outer surface of the driving wheel 22 is meshedly connected with a driven wheel 23. The middle part of the driven wheel 23 is fixedly connected with a threaded collar 24 that penetrates up and down. The inner surface of the threaded collar 24 is threadedly connected with a lifting stud 25 that penetrates up and down. The bottom end of the lifting stud 25 is fixedly connected to the top of the closing baffle 26.

[0034] In this embodiment, when the heating furnace is in use, by starting the first motor 21, the driving wheel 22 can be driven to rotate, and the threaded collar 24 can be driven to rotate through the driven wheel 23, so that the lifting stud 25 can be driven to move up and down by cooperating with the thread of the lifting stud 25, and the closing baffle 26 can be driven to block the front side of the heating furnace body 1 to close the heating furnace body 1, and then the second motor 262 can be started to drive the first screw 263 to rotate, so that the threaded slide plate 264 can be driven to slide along the guide column 265, so that the sealing clamp 267 can be pushed to slide through the push rod 266, so that the sealing clamp 267 can be stuck in the inside of the sealing clamp groove 11, which can make the closing effect of the heating furnace body 1 better, thereby effectively sealing the heating furnace body 1, avoiding heat loss, and achieving high efficiency and energy saving effects of the heating furnace.

[0035] Example 2

[0036] like Figure 4-5 As shown, on the basis of Example 1, the present invention provides a technical solution: preferably, the waste heat utilization mechanism 3 includes a connection box 31, the connection box 31 is fixedly connected to the top of the heating furnace body 1, and the two connection mechanisms 4 are respectively fixedly connected to the front and rear sides of the top of the connection box 31, and the middle of the connection box 31 is fixedly connected with a waste gas exhaust pipe 32 that runs through the front and rear, and the front end of the waste gas exhaust pipe 32 is fixedly connected to the top front side of the heating furnace body 1, and the front and rear sides of the connection box 31 are fixedly connected with a conducting pipe 33, and the conducting pipe 33 is fixedly connected to the bottom of the connecting mechanism 4 and the middle is fixedly connected with a preheating sleeve 34, and the preheating sleeve 34 is fixedly connected to the preheating sleeve 34. The outer surface of the heat sleeve 34 is fixedly connected to the middle part of the exhaust gas exhaust pipe 32. The preheating sleeve 34 includes a metal heat conducting pipe 341. The metal heat conducting pipe 341 is fixedly connected to the middle part of the conducting pipe 33. The outer surface of the metal heat conducting pipe 341 is fixedly connected to the insulation pipe 342. Vortex heating grooves 343 are provided on the upper and lower sides of the interior of the metal heat conducting pipe 341. An air intake groove 344 is provided at the front end of the two vortex heating grooves 343. The air intake groove 344 is connected to the front side of the exhaust gas exhaust pipe 32. An exhaust groove 345 is provided at the rear end of the vortex heating groove 343. The exhaust groove 345 is connected to the rear side of the exhaust gas exhaust pipe 32.

[0037] In this embodiment, when the heating furnace is in use, the exhaust gas in the heating furnace body 1 can be discharged through the exhaust gas exhaust pipe 32, and the high-temperature exhaust gas flowing in the exhaust gas exhaust pipe 32 will enter the vortex heating groove 343 through the air inlet groove 344, so that the metal heat conduction pipe 341 can be heated, and the heat loss can be avoided through the insulation pipe 342, so that the fuel gas passing through the conductive pipe 33 and the metal heat conduction pipe 341 can be preheated, and the fuel gas can reach a higher temperature before entering the heating furnace body 1, thereby effectively improving the thermal efficiency of the heating furnace and reducing energy consumption.

[0038] Example 3

[0039] like Figure 6-7As shown, on the basis of Example 1, the present invention provides a technical solution: preferably, a connecting plug 51 is fixedly connected to the bottom end of the gas delivery pipe 5, a sealing ring 52 is slidably connected to the upper surface of the outer surface of the connecting plug 51, an annular groove 53 is provided below the outer surface of the connecting plug 51, the connecting mechanism 4 comprises a connecting sleeve 41, the connecting sleeve 41 is fixedly connected to the top of the waste heat utilization mechanism 3, the connecting plug 51 is slidably plugged into the inner surface of the connecting sleeve 41, an annular groove is provided on the outer surface of the connecting sleeve 41, an internal thread rotating ring 42 is rotatably connected to the outer side of the annular groove, an external thread sliding ring 43 is threadedly connected to the inner surface of the internal thread rotating ring 42, the external thread sliding ring 43 is slidably connected to the inside of the annular groove, sliding grooves 2 are provided on both sides of the inner surface of the annular groove, the sliding grooves 2 penetrate to the inner surface of the connecting sleeve 41, and the inner surface of the external thread sliding ring 43 is fixedly connected to the limiting slide plate 4 on both sides. 4. The limiting slide plate 44 is slidably connected to the inside of the sliding groove 2. The middle part of the limiting slide plate 44 is movably connected with a transmission wheel 45 that penetrates from front to back. The rear side of the transmission wheel 45 is meshedly connected with a transmission rack 46. The transmission rack 46 is fixedly connected to the rear surface of the sliding groove 2. The side of the transmission wheel 45 away from the external threaded sliding ring 43 is fixedly connected with a second screw 47. The end of the second screw 47 away from the transmission wheel 45 penetrates to the outside of the transmission wheel 45 and is threadedly connected to a threaded slider 48 on the outer surface. The outer surface of the threaded slider 48 is slidably connected with a fixed sleeve plate 49. The outer surface of the fixed sleeve plate 49 is slidably connected to the inner surface of the sliding groove 2 and the end away from the transmission wheel 45 penetrates to the inside of the annular groove 53. The front and rear sides of the threaded slider 48 are fixedly connected with two limiting slide bars 410. The front and rear sides of the inner surface of the fixed sleeve plate 49 are provided with two limiting slide grooves 411. The limiting slide bar 410 is slidably connected to the inside of the limiting slide groove 411.

[0040] In this embodiment, when the heating furnace is connected to the gas delivery pipe 5, the connecting pipe 51 will be inserted into the interior of the connecting sleeve 41, and the gas delivery pipe 5 can be sealed by squeezing the sealing ring 52. Then, the internal thread rotating ring 42 is rotated, and the external thread sliding ring 43 can slide inside the annular groove under the restriction of the limiting slide plate 44, and the limiting slide plate 44 can drive the transmission wheel 45 to penetrate the front side of the transmission rack 46, so that the second screw 47 can be rotated under the meshing transmission of the transmission wheel 45 and the transmission rack 46, so that the threaded slider 48 can be driven to slide, and the limiting slide bar 410 can slide inside the limiting slide groove 411, so that the fixed sleeve 49 can be pushed into the inside of the annular groove 53, so as to realize the connection between the heating furnace and the gas delivery pipe 5, improve the connection effect, and make the use of the threaded steel rolling heating furnace more convenient.

[0041] The following is a detailed description of the working principle of this energy-saving steel rolling heating furnace.

[0042] like Figure 1-7 As shown, when the threaded steel rolling heating furnace is used, the connecting plug 51 is inserted into the inside of the connecting sleeve 41, and the internal thread rotating ring 42 is rotated to enable the external thread sliding ring 43 to drive the limiting slide plate 44 to slide, and under the meshing transmission of the transmission wheel 45 and the transmission rack 46, the second screw 47 can drive the threaded slider 48 to slide, so that the fixed sleeve 49 can be pushed into the inside of the annular groove 53 to achieve the connection between the heating furnace and the gas delivery pipe 5, and then the threaded steel is placed inside the heating furnace body, and by starting the first motor 21, the driving wheel 22 can drive the driven wheel 23 to rotate, and the lifting stud 25 can be driven to move up and down through the threaded sleeve 24, so that the closing baffle 26 blocks the front side of the heating furnace body 1 to move the heating furnace body 1. The gas delivery pipe 5 and the conducting pipe 33 are then conveyed to the heating furnace body 1 by the natural gas and the combustion-supporting gas. The natural gas can be ignited by the ignition device inside the heating furnace body 1, thereby heating the rebar. At the same time, the exhaust gas generated during the heating process will be discharged through the exhaust gas discharge pipe 32, and the high-temperature exhaust gas flowing in the exhaust gas discharge pipe 32 will enter the vortex heating groove 343 through the air inlet groove 344, and can heat the metal heat pipe 341, thereby preheating the gas passing through the conducting pipe 33 and the metal heat pipe 341, so that the gas can reach a higher temperature before entering the heating furnace body 1, thereby effectively improving the thermal efficiency of the heating furnace, reducing energy consumption, and making the use of the heating furnace for rolling rebar more convenient. The above generally describes the present invention in detail, but on the basis of the present invention, some modifications or improvements can be made to it, which is obvious to a general technician in the technical field. Therefore, modifications or improvements that do not deviate from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. An energy-saving steel rolling heating furnace, characterized in that: It comprises a heating furnace body (1), a furnace door (2) is slidably mounted on the front side of the heating furnace body (1), a waste heat utilization mechanism (3) is fixedly connected to the top of the heating furnace body (1), connecting mechanisms (4) are fixedly connected to the front and rear sides of the top of the waste heat utilization mechanism (3), and a gas delivery pipe (5) is fixedly mounted on the top of the connecting mechanism (4); The furnace door (2) comprises a closing baffle (26), the closing baffle (26) being slidably connected to the front side of the heating furnace body (1), the closing baffle (26) comprising a sliding baffle (261), a sliding groove 1 being provided inside the sliding baffle (261), a second motor (262) being fixedly installed in the middle of the sliding groove 1, the upper and lower output shafts of the second motor (262) being fixedly connected to a first screw rod (263), the outer surface of the first screw rod (263) being threadedly connected to a threaded slide plate (264), the left and right sides of the inside of the threaded slide plate (264) being slidable A guide column (265) is connected to the upper and lower parts, and the guide column (265) is fixedly connected to the inside of the sliding groove (264). The left and right sides of the threaded slide plate (264) away from the second motor (262) are movably connected with push rods (266). One end of the four push rods (266) away from the threaded slide plate (264) is movably connected with a sealing clamp ring (267). A sealing clamp groove (11) is opened at the lower front side of the heating furnace body (1). The outer surface of the sealing clamp ring (267) is slidably connected to the inner surface of the sliding groove (1) and the rear end thereof passes through the inside of the sealing clamp groove (11). The waste heat utilization mechanism (3) comprises a connection box (31), the connection box (31) is fixedly connected to the top of the heating furnace body (1), the two connection mechanisms (4) are respectively fixedly connected to the front and rear sides of the top of the connection box (31), the middle of the connection box (31) is fixedly connected with a waste gas discharge pipe (32) that runs through the front and rear, the front end of the waste gas discharge pipe (32) is fixedly connected to the front side of the top of the heating furnace body (1), the front and rear sides of the connection box (31) are fixedly connected with a conduction pipe (33), the conduction pipe (33) is fixedly connected to the bottom of the connection mechanism (4) and the middle is fixedly connected with a preheating sleeve (34), the outer surface of the preheating sleeve (34) is in contact with the waste gas discharge pipe The preheating sleeve (34) is fixedly connected to the middle part of the conduction pipe (32), the preheating sleeve (34) comprises a metal heat-conducting pipe (341), the metal heat-conducting pipe (341) is fixedly connected to the middle part of the conduction pipe (33), the outer surface of the metal heat-conducting pipe (341) is fixedly connected to a heat-insulating pipe (342), the metal heat-conducting pipe (341) is provided with vortex heating grooves (343) on both the upper and lower sides of the interior, the front ends of the two vortex heating grooves (343) are provided with an air intake groove (344), the air intake groove (344) is communicated with the front side of the exhaust gas discharge pipe (32), the rear ends of the vortex heating grooves (343) are provided with an exhaust groove (345), the exhaust groove (345) is communicated with the rear side of the exhaust gas discharge pipe (32).

2. The energy-saving steel rolling heating furnace according to claim 1 is characterized in that: The furnace door (2) comprises a first motor (21), and movable grooves (21) are provided on both left and right sides of the front top of the heating furnace body (1). The first motor (21) is fixedly installed inside the movable groove (2), and the output shaft of the first motor (21) is fixedly connected to a driving wheel (22), and the outer surface of the driving wheel (22) is meshingly connected to a driven wheel (23).

3. The energy-saving steel rolling heating furnace according to claim 2 is characterized in that: A threaded collar (24) passing through the driven wheel (23) is fixedly connected in the middle thereof, and a lifting stud (25) passing through the driven wheel (23) is threadedly connected on the inner surface of the threaded collar (24), and the bottom end of the lifting stud (25) is fixedly connected to the top end of the closing baffle (26).

4. The energy-saving steel rolling heating furnace according to claim 1 is characterized in that: The bottom end of the gas delivery pipe (5) is fixedly connected to a connecting plug (51), a sealing ring (52) is slidably connected above the outer surface of the connecting plug (51), an annular groove (53) is provided below the outer surface of the connecting plug (51), and the connecting mechanism (4) comprises a connecting sleeve (41), the connecting sleeve (41) is fixedly connected to the top of the waste heat utilization mechanism (3), and the connecting plug (51) is slidably plugged into the inner surface of the connecting sleeve (41).

5. The energy-saving steel rolling heating furnace according to claim 4 is characterized in that: The outer surface of the connecting sleeve (41) is provided with an annular groove, the outer side of the annular groove is rotatably connected with an internal thread rotating ring (42), the inner surface of the internal thread rotating ring (42) is threadedly connected with an external thread sliding ring (43), the external thread sliding ring (43) is slidably connected inside the annular groove, and the inner surface of the annular groove is provided with sliding grooves 2 on both sides, and the sliding grooves 2 penetrate to the inner surface of the connecting sleeve (41).

6. The energy-saving steel rolling heating furnace according to claim 5, characterized in that: The inner surface of the external threaded sliding ring (43) is fixedly connected to a limiting slide plate (44) on both sides. The limiting slide plate (44) is slidably connected to the inside of the second sliding groove. The middle part of the limiting slide plate (44) is movably connected to a transmission wheel (45) that passes through the front and rear. The rear side of the transmission wheel (45) is meshedly connected to a transmission rack (46). The transmission rack (46) is fixedly connected to the rear surface of the second sliding groove.

7. The energy-saving steel rolling heating furnace according to claim 6 is characterized in that: A second screw rod (47) is fixedly connected to a side of the transmission wheel (45) away from the external threaded sliding ring (43); one end of the second screw rod (47) away from the transmission wheel (45) penetrates to the outside of the transmission wheel (45) and a threaded slider (48) is threadedly connected to the outer surface of the threaded slider (48); a fixed sleeve (49) is slidably connected to the outer surface of the fixed sleeve (49) and the end away from the transmission wheel (45) penetrates to the inside of the annular groove (53).

8. The energy-saving steel rolling heating furnace according to claim 7 is characterized in that: Two limiting slide bars (410) are fixedly connected to the front and rear sides of the threaded slider (48), and two limiting slide grooves (411) are provided on the front and rear sides of the inner surface of the fixed sleeve (49), and the limiting slide bars (410) are slidably connected inside the limiting slide grooves (411).

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