Energy-saving heating furnace

Abstract

The energy-saving heating furnace comprises a furnace body and a heating gun arranged in front of the furnace body, the furnace body comprises an outer box and an inner container arranged in the outer box, a discharging hole and a feeding hole are formed in the front side and the rear side of the outer box respectively, and the position of an opening in the front end of the inner container is matched with the position of the discharging hole; a fire spraying opening of the heating gun is arranged backwards and is aligned to an opening in the front end of the inner container through the discharging hole, and the inner container comprises a heat insulation body and a hearth arranged in the heat insulation body; the heat energy recovery system is arranged between the air inlet of the heating gun and the inner container; the waste heat circulating mechanism is arranged between the outer box and the inner container; according to the invention, the heating time of the heating gun is effectively reduced, and the feeding speed of the metal section material is accelerated, so that the fuel consumption is greatly reduced to achieve the purposes of energy conservation and environmental protection, meanwhile, the production efficiency is effectively ensured, the potential safety hazard is eliminated, and an operator cannot be scalded even if the operator accidentally touches the smoke exhaust pipe or the outer wall of the furnace body.

Description

Technical Field

[0001] The present application relates to the technical field of metal material heating equipment, and in particular, to an energy-saving heating furnace. Background Art

[0002] Hot extrusion is a common method in forging processing. This process mainly involves heating the metal material to the hot forging forming temperature for extrusion to obtain a plastic processing method of the desired cross-sectional shape and size. Hot extrusion is mainly used to manufacture long pieces, profiles, pipes, bars and various machine parts of ordinary equal cross-sections. Compared with cold and warm extrusion, the metal material has a small deformation force and a large deformation amount during hot extrusion, and very complex cross-sections can be extruded.

[0003] Before hot extrusion processing, the metal bars need to be cut into the same length as required to form metal segments, and then the metal segments are sent to the heating furnace to be heated to the specified temperature. At present, the heating methods of heating furnaces are mainly electric heating and fuel combustion heating. The heating speed of electric heating is slow and the power is large. Some factories cannot bear high-power current, and the electricity bill is also expensive, so the production cost is high. Fuel combustion heats up quickly and has a low unit price, so the production cost is relatively low. Therefore, most heating furnaces still prefer fuel combustion heating.

[0004] Solid fuels have poor fluidity, large volume, and are inconvenient to add, so heating furnaces generally use gaseous fuels, such as liquefied petroleum gas (commonly known as coal gas), natural gas, etc.

[0005] The combustion of gas fuel in the heating gun in the heating furnace must be accompanied by air. The existing heating furnace directly introduces room temperature air into the heating gun. Since the base temperature of room temperature air is relatively low (calculated at an average of 20 degrees), and the target temperature of the metal section material is generally above 1400 degrees, in order to make the metal section material reach the target temperature (1400 degrees), the heating time of the heating gun must be extended and the feeding speed of the metal section material must be slowed down. Because the difference between the base temperature and the target temperature is large, more fuel must be consumed, and the production efficiency is also affected. In addition, the high-temperature exhaust gas generated by the furnace of the heating furnace is directly discharged to the outside, the heat is lost in vain and the temperature of the smoke exhaust pipe is very high. The heat radiated outward from the furnace of the heating furnace will also be lost outward through the furnace body and the temperature of the outer wall of the furnace body is also high. If the operator is not careful, he will be scalded by the smoke exhaust pipe or the outer wall of the furnace body, which poses a safety hazard.

[0006] Therefore, it urgently needs to be resolved. Summary of the invention

[0007] In view of the current status of the above-mentioned prior art, the technical problem to be solved by the present invention is to provide an energy-saving heating furnace which fully and reasonably utilizes the heat in the high-temperature exhaust gas that was originally directly discharged to the outside with the help of a heat energy recovery system to greatly reduce the fuel consumption, thereby achieving the purpose of energy saving and environmental protection and effectively ensuring production efficiency, and also effectively utilizes the heat radiated from the furnace to the furnace body with the help of a waste heat circulation mechanism to further save fuel consumption, while eliminating safety hazards.

[0008] The technical solution adopted by the present invention to solve the above technical problems is: an energy-saving heating furnace, including a furnace body and a heating gun arranged in front of the furnace body, the furnace body includes an outer box and an inner tank arranged inside the outer box, the front and rear sides of the outer box are respectively provided with a discharge hole and a feed hole, the position of the front end opening of the inner tank is matched with the position of the discharge hole, the flame nozzle of the heating gun is arranged backward and is aligned with the front end opening of the inner tank through the discharge hole, the inner tank includes an insulator and a furnace arranged inside the insulator, and is characterized in that: It also includes a heat recovery system disposed between the air inlet of the heating gun and the inner tank, the heat recovery system includes a smoke guide pipe vertically plugged into the rear of the top of the inner tank and interconnected with the interior of the inner tank, a heat absorption component vertically disposed on the top of the outer box and located above the smoke guide pipe, and a high-temperature fan fixed on the top of the outer box and located in front of the heat absorption component; The heat absorption assembly comprises a base fixed on the outer box, an outer sleeve fixed vertically on the top of the base, a pipe cover fixed transversely on the end opening of the outer sleeve, and a metal bellows concentrically arranged inside the outer sleeve, the upper end opening of the metal bellows passes through the pipe cover and extends above the pipe cover, the lower end opening of the metal bellows is fixed on the top of the base, an annular convection cavity is formed between the outer wall of the metal bellows and the inner wall of the outer sleeve, the upper end of the smoke guide pipe passes through the top of the heat insulator, the top of the outer box and the base in sequence, and is connected with the lower end opening of the metal bellows; The heat absorption component also includes an air inlet pipe vertically arranged inside the annular convection cavity and located in front of the metal bellows, a first connecting pipe transversely inserted and arranged on the front side of the outer sleeve, and an air outlet pipe transversely plugged into the front side of the outer sleeve and connected with the inside of the annular convection cavity and lower than the first connecting pipe. The upper end of the air inlet pipe is open and close to the pipe cover, the lower end of the air inlet pipe is closed, the rear end opening of the first connecting pipe is sealed and plugged into the front side of the lower end of the air inlet pipe and connected with the inside of the air inlet pipe, the front end opening of the first connecting pipe is connected to the air outlet of the high-temperature fan, the root opening of the air outlet pipe is close to the top of the base, and the end opening of the air outlet pipe is connected to the air inlet of the heating gun.

[0009] Preferably, it also includes a waste heat circulation mechanism arranged between the outer box and the inner tank, the waste heat circulation mechanism includes an inner box fixed to the outside of the insulation body and placed in the outer box, and a second connecting pipe inserted in the top of the outer box, the upper and lower left and right outer walls of the inner box are respectively spaced a certain distance from the upper and lower left and right inner walls of the outer box so that a rectangular annular convection cavity is formed between the upper and lower left and right outer walls of the inner box and the upper and lower left and right inner walls of the outer box, the root opening of the second connecting pipe is interconnected with the interior of the rectangular annular convection cavity, the end opening of the second connecting pipe is connected to the air inlet of the high-temperature fan, and a plurality of air inlet holes are opened on the top of the outer box.

[0010] Preferably, the furnace chamber includes a transversely arranged insulation bottom plate, an arched insulation cover arranged on the top of the insulation bottom plate, a refractory bottom plate transversely fixed on the top of the insulation bottom plate and located inside the arched insulation cover, an arched furnace top transversely arranged on the top of the refractory bottom plate and located inside the arched insulation cover, and a material guide plate transversely arranged on the top of the refractory bottom plate and located inside the arched furnace top, and a heating furnace cavity is formed between the top of the material guide plate and the inner wall of the arched furnace top.

[0011] Preferably, the arched furnace roof includes a plurality of arched heating covers which are arranged end to end in sequence from front to back, and the material guide plate includes a plurality of material guide blocks which are arranged end to end in sequence from front to back; a plurality of material guide grooves which are arranged from left to right are formed on the top of each material guide block, and a heating furnace channel is formed between the material guide grooves on the same horizontal line on each material guide block.

[0012] Preferably, a slope surface inclined downward is formed on the edge of the rear end opening of each material guide trough, and the end edge of the slope surface on each material guide trough is lower than the edge of the front end opening of a material guide trough behind it; the width of the end opening of the slope surface is greater than the width of the rear end opening of the material guide trough.

[0013] Preferably, a slope with a higher front and a lower back is formed between the left edge of the top opening of the leftmost material guide trough and the left edge of the top of the material guide block, and between the right edge of the top opening of the rightmost material guide trough and the right edge of the top of the material guide block.

[0014] Preferably, the heat absorption component also includes an insulation tube concentrically sleeved on the outside of the outer sleeve, the lower opening of the insulation tube is fixed to the top of the base, and the first connecting pipe and the air outlet pipe are both arranged through the insulation tube.

[0015] Preferably, the furnace also includes an arched fireproof plate arranged between the arched heat insulation cover and the arched furnace top.

[0016] Preferably, a plurality of fans distributed sequentially from front to back are embedded in the bottom of the outer box, and the air outlet of each fan is arranged upward and is interconnected with the interior of the rectangular annular convection cavity.

[0017] Preferably, a plurality of support plates are fixed between the bottom outer wall of the inner box and the bottom inner wall of the outer box, which are vertically arranged and arranged in sequence from front to back so that the bottom outer wall of the inner box and the bottom inner wall of the outer box are separated by a certain distance, and the upper and lower edges of each of the support plates are provided with a plurality of ventilation gaps distributed in sequence from left to right.

[0018] Compared with the prior art, the advantages of the present invention are: (1) The present invention absorbs most of the heat in the high-temperature exhaust gas generated by the heating furnace with the help of a heat recovery system, and transfers the above heat to the room temperature air in the heating gun that is about to enter the heating furnace, thereby greatly increasing the basic temperature of the room temperature air, and then the above heated air is sent to the heating gun through a high-temperature fan to participate in the combustion of the fuel, thereby significantly reducing the difference between the basic temperature and the target temperature, thereby effectively reducing the heating time of the heating gun and accelerating the feeding speed of the metal section material, thereby greatly reducing the fuel consumption to achieve the purpose of energy saving and environmental protection, thereby fully and reasonably utilizing the heat in the high-temperature exhaust gas that was originally directly discharged, and effectively ensuring production efficiency.

[0019] (2) The present invention uses a waste heat circulation mechanism to introduce air located inside the rectangular annular convection cavity and having a temperature higher than room temperature into the circular annular convection cavity as the inlet air flow of the high-temperature fan, thereby effectively utilizing the heat radiated from the furnace to the furnace body, thereby further increasing the temperature of the air entering the circular annular convection cavity to further reduce the difference between the base temperature and the target temperature, thereby further saving fuel consumption.

[0020] (3) The present invention not only significantly reduces the temperature of the smoke exhaust pipe by absorbing the heat in the high-temperature exhaust gas, but also effectively reduces the temperature of the outer wall of the furnace body by absorbing the heat radiated from the furnace to the furnace body, thereby eliminating safety hazards. Even if the operator accidentally touches the smoke exhaust pipe or the outer wall of the furnace body, he will not be burned. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and other features, advantages and aspects of the embodiments of the present application will become more apparent with reference to the following specific embodiments in conjunction with the accompanying drawings. Throughout the accompanying drawings, the same or similar reference numerals represent the same or similar elements. It should be understood that the accompanying drawings are schematic, and the originals and elements are not necessarily drawn to scale. In the accompanying drawings: Figure 1 It is a top view of the exploded structure of the present invention from the right front side.

[0022] Figure 2It is a right side cross-sectional structural diagram of the heat energy recovery system of the present invention.

[0023] Figure 3 It is a top view of the metal bellows structure of the present invention.

[0024] Figure 4 It is a right front exploded structural diagram of the inner container of the present invention.

[0025] Figure 5 It is an exploded view of the guide plate of the present invention.

[0026] Figure 6 It is a right front side bottom view structural diagram of the present invention. DETAILED DESCRIPTION

[0027] The embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be construed as being limited to the embodiments described herein. On the contrary, these embodiments are provided for a more thorough and complete understanding of the present application. It should be understood that the drawings and embodiments of the present application are for exemplary purposes only and are not intended to limit the scope of protection of the present application.

[0028] It should be understood that the various steps described in the method implementation of the present application can be performed in different orders and / or in parallel. In addition, the method implementation may include additional steps and / or omit the steps shown, and the scope of the present application is not limited in this respect.

[0029] The term "including" and its variations used herein are open inclusions, i.e., "including but not limited to". The term "based on" means "based at least in part on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; and the relevant definitions of other terms will be given in the following description.

[0030] It should be noted that the concepts such as "first" and "second" mentioned in this application are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0031] It should be noted that the modifications of "one" and "plurality" mentioned in the present application are illustrative rather than restrictive, and those skilled in the art should understand that unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0032] like Figures 1 to 6As shown, an energy-saving heating furnace comprises a furnace body 1 and a heating gun 2 arranged in front of the furnace body 1, the furnace body 1 comprises an outer box 11 and an inner tank 12 arranged inside the outer box 11, a discharge hole 111 and a feed hole 112 are respectively arranged on the front and rear sides of the outer box 11, the position of the front end opening of the inner tank 12 matches the position of the discharge hole 111, the flame nozzle of the heating gun 2 is arranged backward and is aligned with the front end opening of the inner tank 12 through the discharge hole 111, and the inner tank 12 comprises a heat insulator 121 and a furnace 122 arranged inside the heat insulator 121; It also includes a heat recovery system 3 disposed between the air inlet of the heating gun 2 and the inner tank 12, the heat recovery system 3 includes a smoke guide pipe 31 vertically plugged into the rear of the top of the inner tank 12 and interconnected with the interior of the inner tank 12, a heat absorption component 32 vertically disposed on the top of the outer box 11 and located above the smoke guide pipe 31, and a high-temperature fan 33 fixed on the top of the outer box 11 and located in front of the heat absorption component 32; The heat absorption component 32 includes a base 321 fixed on the outer box 11, an outer sleeve 322 vertically fixed on the top of the base 321, a pipe cover 327 horizontally fixed on the end opening of the outer sleeve 322, and a metal bellows 323 concentrically arranged inside the outer sleeve 322. The upper end opening of the metal bellows 323 passes through the pipe cover 327 and extends above the pipe cover 327. The lower end opening of the metal bellows 323 is fixed to the top of the base 321. An annular convection cavity 329 is formed between the outer wall of the metal bellows 323 and the inner wall of the outer sleeve 322. The upper end of the smoke guide pipe 31 passes through the top of the heat insulator 121, the top of the outer box 11 and the base 321 in sequence and is connected with the lower end opening of the metal bellows 323. The heat absorption component 32 also includes an air inlet pipe 324 vertically arranged inside the annular convection cavity 329 and located in front of the metal bellows 323, a first connecting pipe 325 horizontally inserted and arranged at the front side of the outer sleeve 322, and an air outlet pipe 326 horizontally inserted at the front side of the outer sleeve 322 and connected with the inside of the annular convection cavity 329 and lower than the first connecting pipe 325. The upper end of the air inlet pipe 324 is open and close to the pipe cover 327, the lower end of the air inlet pipe 324 is closed, the rear end opening of the first connecting pipe 325 is sealed and inserted at the front side of the lower end of the air inlet pipe 324 and connected with the inside of the air inlet pipe 324, the front end opening of the first connecting pipe 325 is connected to the air outlet of the high-temperature fan 33, the root opening of the air outlet pipe 326 is close to the top of the base 321, and the end opening of the air outlet pipe 326 is connected to the air inlet of the heating gun 2.

[0033] The heat absorption component 32 also includes an insulation tube 328 concentrically sleeved on the outside of the outer sleeve 322, the lower opening of the insulation tube 328 is fixed to the top of the base 321, and the first connecting pipe 325 and the air outlet pipe 326 are both arranged through the insulation tube 328.

[0034] A groove 3281 is formed at the front edge of the lower opening of the heat insulating tube 328 , and the first connecting pipe 325 and the air outlet pipe 326 are both arranged through the groove 3281 .

[0035] The working principle of the heat recovery system 3 is as follows: After the heating gun 2 is ignited, a high-temperature flame is generated, and the high-temperature flame is sprayed into the inner container 12 through the discharge hole 111 and the front end opening of the inner container 12, pushing the metal segment material into the furnace 122 through the feed hole 112 and moving forward, and the high-temperature flame heats the metal segment material in the furnace 122. The high-temperature exhaust gas generated during the heating process enters the metal bellows 323 through the smoke guide pipe 31, and then is discharged outward through the upper end opening of the metal bellows 323, but after passing through the metal bellows 32 During the heating process, the heat of the high-temperature exhaust gas will be transferred to the metal bellows 323; at the same time, after the high-temperature fan 33 is started, the air will enter the air inlet pipe 324 through the first connecting pipe 325 under the action of the high-temperature fan 33, and then blow to the pipe cover 327 through the upper end opening of the air inlet pipe 324. After being blocked by the pipe cover 327, the air flows downward and gradually fills the annular convection cavity 329, and finally enters the air inlet of the heating gun 2 through the air outlet pipe 326 to participate in the combustion of the fuel inside the heating gun 2. During the circulation of air from top to bottom in the annular convection cavity 329, the heat on the metal bellows 323 is transferred to the air through the heat convection principle, thereby effectively increasing the temperature of the air entering the heating gun 2 to participate in the fuel combustion, so that the heating gun 2 can quickly heat the flame to a higher temperature with the same amount of fuel, thereby saving fuel consumption; and the advantage of using the metal bellows 323 is that the curved and undulating outer circumference of the metal bellows 323 can be used to increase the contact area between the metal bellows 323 and the high-temperature exhaust gas to improve the heat absorption efficiency, and the curved and undulating inner circumference of the metal bellows 323 can also be used to increase the contact area between the metal bellows 323 and the air located inside the annular convection cavity 329 to improve the heating efficiency; since the temperature of the outer sleeve 322 is relatively high, if the operator accidentally touches the outer sleeve 322, he will be scalded, so the present invention is provided with an insulation tube 328 to prevent the operator from directly contacting the outer sleeve 322, thereby preventing the occurrence of scalding.

[0036] An energy-saving heating furnace also includes a waste heat circulation mechanism arranged between an outer box 11 and an inner tank 12, the waste heat circulation mechanism includes an inner box 4 fixed to the outside of the insulation 121 and placed in the outer box 11, and a second connecting pipe 5 inserted at the top of the outer box 11, the upper and lower left and right outer walls of the inner box 4 are respectively spaced a certain distance from the upper and lower left and right inner walls of the outer box 11 so that a rectangular annular convection cavity 6 is formed between the upper and lower left and right outer walls of the inner box 4 and the upper and lower left and right inner walls of the outer box 11, the root opening of the second connecting pipe 5 is interconnected with the interior of the rectangular annular convection cavity 6, the end opening of the second connecting pipe 5 is connected to the air inlet of the high-temperature fan 33, and a plurality of air inlet holes 113 are opened on the top of the outer box 11.

[0037] The furnace chamber 122 includes a transversely arranged insulation bottom plate 1221, an arched insulation cover 1222 arranged on the top of the insulation bottom plate 1221, a refractory bottom plate 1223 transversely fixed on the top of the insulation bottom plate 1221 and located inside the arched insulation cover 1222, an arched furnace top transversely arranged on the top of the refractory bottom plate 1223 and located inside the arched insulation cover 1222, and a material guide plate transversely arranged on the top of the refractory bottom plate 1223 and located inside the arched furnace top, and a heating furnace chamber 1227 is formed between the top of the material guide plate and the inner wall of the arched furnace top.

[0038] The working principle of the waste heat circulation mechanism is as follows: Although a heat insulator 121 is provided outside the furnace 122 to reduce heat loss, a certain amount of heat is still radiated outward. During the radiation process, the air inside the rectangular annular convection cavity 6 will be heated up, thereby causing the temperature of the outer box 11 to also rise. Once the operator touches the outer wall of the outer box 11, there is a risk of burns; and when the high-temperature fan 33 is working, the air inlet of the high-temperature fan 33 will extract the air inside the rectangular annular convection cavity 6 with the help of the second connecting pipe 5 and send it into the annular convection cavity 329, and the external normal temperature air will enter the rectangular annular convection cavity 6 through the multiple air inlet holes 113. The interior of the rectangular annular convection cavity 6 forms an air circulation, and the normal temperature air continuously entering the interior of the rectangular annular convection cavity 6 will continuously take away the heat radiated by the furnace 122, thereby effectively reducing the temperature of the outer box 11 to eliminate the risk of accidental scalding of the operator. At the same time, the high temperature fan 33 does not need to absorb normal temperature air, but absorbs the air that is located in the rectangular annular convection cavity 6 and preliminarily heated, thereby further increasing the basic temperature of the air entering the circular annular convection cavity 329, and finally further increasing the temperature of the air sent to the heating gun 2, thereby further saving fuel consumption.

[0039] The arched furnace top includes a plurality of arched heating covers 1224 which are connected end to end in sequence from front to back, and the guide plate includes a plurality of guide blocks 1225 which are connected end to end in sequence from front to back. The advantage of such a design is that since the temperature in the heating furnace chamber 1227 can reach above 1400 degrees, the heat conductivity of the high temperature resistant material used to make the guide blocks 1225 and the arched heating cover 1224 is poor, resulting in a slow heat transfer speed. If the high temperature resistant material is long, the high temperature resistant material will crack due to the large difference between cold and hot. Therefore, the arched furnace top and the guide plate are designed to be broken down into parts. The shorter arched heating hood 1224 and material guide block 1225 will not crack when heated, thereby extending their service life. At the same time, the total length of the arched furnace top and the material guide plate can be changed by increasing or decreasing the number of the arched heating hood 1224 and the material guide block 1225 as needed, which makes it more flexible to use and does not require customized arched furnace tops and material guide plates of various lengths as needed for easy production. In addition, it is also convenient for processing and transportation. If individual arched heating hoods 1224 or material guide blocks 1225 are damaged, it is only necessary to replace the damaged arched heating hoods 1224 or material guide blocks 1225 separately.

[0040] A plurality of guide grooves 12251 arranged in sequence from left to right are formed on the top of each guide block 1225, and a heating furnace track 1228 is formed between the guide grooves 12251 on the same horizontal line on each guide block 1225. The metal segments entering the inner tank 12 from the feed hole 112 will fall into the heating furnace track 1228 and move forward along the heating furnace track 1228, thereby playing a role in positioning and guiding.

[0041] The edge of the rear end opening of each guide trough 12251 is formed with a slope 12252 inclined downward, and the end edge of the slope 12252 on each guide trough 12251 is lower than the edge of the front end opening of the guide trough 12251 behind it; the advantage of this design is that due to the limited dimensional accuracy and assembly accuracy of the guide blocks 1225, it is impossible for two adjacent guide blocks 1225 to be completely flush, so that when the guide troughs 12251 on the same horizontal line on two adjacent guide blocks 1225 are assembled, the edge of the rear end opening of the front guide trough 12251 may be higher than the edge of the rear end opening of the guide trough 12251 The edge of the front opening of a material guide trough 12251, so when the metal segment moves horizontally from the back to the front, the front end of the metal segment is blocked by the edge of the rear opening of the material guide trough 12251 on a material guide block 1225 located in front of it and cannot continue to move; but due to the design of the slope 12252, the end edge of the slope 12252 on each material guide trough 12251 is lower than the edge of the front opening of the material guide trough 12251 behind it, so when the metal segment moves horizontally from the back to the front, the metal segment can always move smoothly to the corresponding material guide trough 12251 in front, thereby completely avoiding the occurrence of material blockage.

[0042] The width of the end opening of the slope 12252 is greater than the width of the rear end opening of the guide trough 12251; a slope 12253 with a higher front and a lower back is formed between the left edge of the top opening of the leftmost guide trough 12251 and the top left edge of the guide block 1225, and between the right edge of the top opening of the rightmost guide trough 12251 and the top right edge of the guide block 1225; the advantage of this design is that the adjacent side edges of the top openings of any two adjacent slopes 12252 will form an inner corner with the top of the guide block 1225, and the left edge of the top opening of the leftmost guide trough 12251 and the left edge of the top of the guide block 1225 An outer corner is formed between the edges and between the right edge of the top opening of the rightmost material guide trough 12251 and the top right edge of the material guide block 1225. If the outer diameter of the metal section is large, the left and right edges of the front bottom of the metal section will be blocked by the above-mentioned inner corner and outer corner, thereby causing material blockage. Since the width of the end opening of the slope 12252 is greater than the width of the rear end opening of the material guide trough 12251, the position of each inner corner can be pushed outward and distributed obliquely. The setting of the two inclined surfaces 12253 can eliminate the two outer corners, so that the left and right edges of the front bottom of the metal section with a larger outer diameter can always move forward smoothly to completely avoid the occurrence of material blockage.

[0043] The furnace chamber 122 also includes an arched fireproof plate 1226 arranged between the arched heat-insulating cover 1222 and the arched furnace top, the purpose of which is to prevent the flame from escaping upward from the gap between two adjacent arched heating covers 1224 and directly contacting the arched heat-insulating cover 1222. Because the arched heat-insulating cover 1222 has a low temperature resistance, if the arched heat-insulating cover 1222 directly contacts the flame, it will burn.

[0044] The insulation body 121 includes two insulation side panels 1212 that are vertically arranged and symmetrically distributed in parallel on the left and right, and two insulation cover plates 1211 that are horizontally arranged between the two insulation side panels 1212 and symmetrically distributed in parallel on the top and bottom. An insulation channel 1213 is formed between the two insulation side panels 1212 and the two insulation cover plates 1211. The furnace 122 is arranged inside the insulation channel 1213, and the insulation bottom plate 1221 in the furnace 122 is horizontally fixed on the top of a insulation cover plate 1211 below.

[0045] The smoke guide pipe 31 is vertically inserted between an upper heat-insulating cover plate 1211, an arched heat-insulating cover 1222, an arched fireproof plate 1226, and a rear arched heating cover 1224.

[0046] The bottom of the outer box 11 is also embedded with a plurality of fans 8 distributed in sequence from front to back, and the air outlet of each fan 8 is set upward and is interconnected with the interior of the rectangular annular convection cavity 6; if the air flow entering the rectangular annular convection cavity 6 is to be increased, one or more of the fans 8 can be turned on to allow the external normal temperature air to quickly enter the rectangular annular convection cavity 6.

[0047] A plurality of support plates 7 are fixed between the bottom outer wall of the inner box 4 and the bottom inner wall of the outer box 11. The support plates 7 are arranged vertically and in sequence from front to back so that the bottom outer wall of the inner box 4 and the bottom inner wall of the outer box 11 are spaced a certain distance apart. The upper and lower edges of each support plate 7 are provided with a plurality of ventilation gaps 71 distributed in sequence from left to right.

[0048] The inner box 4 includes a top plate 41 fixed laterally on the top of the insulator 121 and two enclosures 42 fixed on the left and right sides of the top plate 41 and symmetrically arranged on the left and right sides of the insulator 121, respectively. The lower edges of the two enclosures 42 are formed with a laterally arranged support plate 421 facing the bottom of the insulator 121, the tops of the two support plates 421 are fixed to the bottom of the insulator 121, the opposite side edges of the two support plates 421 are fixed to each other, and the upper edge of each support plate 7 is fixed between the bottom outer walls of the two support plates 421.

[0049] A plurality of first heat dissipation holes 411 are provided in the top plate 41 , and a plurality of second heat dissipation holes 422 are provided in the support plate 421 , so that the heat lost from the inner tank 12 to the outside can be guided to the rectangular annular convection cavity 6 in an orderly manner.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An energy-saving heating furnace, comprising a furnace body and a heating gun arranged in front of the furnace body, the furnace body comprising an outer box and an inner liner arranged inside the outer box, the front and rear sides of the outer box are respectively provided with a discharge hole and a feed hole, the position of the front end opening of the inner liner is matched with the position of the discharge hole, the flame nozzle of the heating gun is arranged backward and is aligned with the front end opening of the inner liner through the discharge hole, the inner liner comprises an insulator and a furnace arranged inside the insulator, characterized in that: It also includes a heat recovery system disposed between the air inlet of the heating gun and the inner tank, the heat recovery system includes a smoke guide pipe vertically plugged into the rear of the top of the inner tank and interconnected with the interior of the inner tank, a heat absorption component vertically disposed on the top of the outer box and located above the smoke guide pipe, and a high-temperature fan fixed on the top of the outer box and located in front of the heat absorption component; The heat absorption assembly comprises a base fixed on the outer box, an outer sleeve fixed vertically on the top of the base, a pipe cover fixed transversely on the end opening of the outer sleeve, and a metal bellows concentrically arranged inside the outer sleeve, the upper end opening of the metal bellows passes through the pipe cover and extends above the pipe cover, the lower end opening of the metal bellows is fixed on the top of the base, an annular convection cavity is formed between the outer wall of the metal bellows and the inner wall of the outer sleeve, the upper end of the smoke guide pipe passes through the top of the heat insulator, the top of the outer box and the base in sequence, and is connected with the lower end opening of the metal bellows; The heat absorption component also includes an air inlet pipe vertically arranged inside the annular convection cavity and located in front of the metal bellows, a first connecting pipe transversely inserted and arranged on the front side of the outer sleeve, and an air outlet pipe transversely plugged into the front side of the outer sleeve and connected with the inside of the annular convection cavity and lower than the first connecting pipe. The upper end of the air inlet pipe is open and close to the pipe cover, the lower end of the air inlet pipe is closed, the rear end opening of the first connecting pipe is sealed and plugged into the front side of the lower end of the air inlet pipe and connected with the inside of the air inlet pipe, the front end opening of the first connecting pipe is connected to the air outlet of the high-temperature fan, the root opening of the air outlet pipe is close to the top of the base, and the end opening of the air outlet pipe is connected to the air inlet of the heating gun.

2. The energy-saving heating furnace according to claim 1, characterized in that: It also includes a waste heat circulation mechanism arranged between the outer box and the inner tank, the waste heat circulation mechanism includes an inner box fixed to the outside of the insulation body and placed in the outer box, and a second connecting pipe inserted into the top of the outer box, the upper and lower left and right outer walls of the inner box are respectively spaced a certain distance from the upper and lower left and right inner walls of the outer box so that a rectangular annular convection cavity is formed between the upper and lower left and right outer walls of the inner box and the upper and lower left and right inner walls of the outer box, the root opening of the second connecting pipe is interconnected with the interior of the rectangular annular convection cavity, the end opening of the second connecting pipe is connected to the air inlet of the high-temperature fan, and a plurality of air inlet holes are opened on the top of the outer box.

3. The energy-saving heating furnace according to claim 1, characterized in that: The furnace chamber includes a transversely arranged insulating bottom plate, an arched insulating cover arranged on the top of the insulating bottom plate, a refractory bottom plate transversely fixed on the top of the insulating bottom plate and located inside the arched insulating cover, an arched furnace top transversely arranged on the top of the refractory bottom plate and located inside the arched insulating cover, and a material guide plate transversely arranged on the top of the refractory bottom plate and located inside the arched furnace top, and a heating furnace cavity is formed between the top of the material guide plate and the inner wall of the arched furnace top.

4. The energy-saving heating furnace according to claim 3, characterized in that: The arched furnace top includes a plurality of arched heating covers which are connected end to end in sequence from front to back, and the material guide plate includes a plurality of material guide blocks which are connected end to end in sequence from front to back; a plurality of material guide grooves which are arranged from left to right are formed on the top of each material guide block, and a heating furnace channel is formed between the material guide grooves on the same horizontal line on each material guide block.

5. The energy-saving heating furnace according to claim 4, characterized in that: The edge of the rear end opening of each material guide trough is formed with a slope that is inclined downward, and the end edge of the slope on each material guide trough is lower than the edge of the front end opening of a material guide trough behind it; the width of the end opening of the slope is greater than the width of the rear end opening of the material guide trough.

6. The energy-saving heating furnace according to claim 5, characterized in that: A slope with a higher front and a lower back is formed between the left edge of the top opening of the leftmost material guide trough and the left edge of the top of the material guide block, and between the right edge of the top opening of the rightmost material guide trough and the right edge of the top of the material guide block.

7. The energy-saving heating furnace according to claim 1, characterized in that: The heat absorption component also includes an insulation tube concentrically sleeved on the outside of the outer sleeve, the lower opening of the insulation tube is fixed to the top of the base, and the first connecting pipe and the air outlet pipe are both arranged through the insulation tube.

8. The energy-saving heating furnace according to claim 3, characterized in that: The furnace also includes an arched fireproof plate arranged between the arched heat-insulating cover and the arched furnace top.

9. The energy-saving heating furnace according to claim 2, characterized in that: A plurality of fans are embedded in the bottom of the outer box and are distributed sequentially from the front to the back. The air outlet of each fan is arranged upward and is communicated with the interior of the rectangular annular convection cavity.

10. The energy-saving heating furnace according to claim 2, characterized in that: A plurality of vertically arranged support plates arranged in sequence from front to back are fixed between the bottom outer wall of the inner box and the bottom inner wall of the outer box so that the bottom outer wall of the inner box and the bottom inner wall of the outer box are spaced a certain distance apart, and the upper and lower edges of each of the support plates are provided with a plurality of ventilation gaps distributed in sequence from left to right.

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