An energy-saving heating furnace

Abstract

The present invention relates to an energy-saving heating furnace, which comprises 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 back 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 outlet 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 a heat insulation body and a furnace chamber arranged inside the heat insulation body; It also includes a heat energy recovery system arranged between the air inlet of the heating gun and the inner tank; It also includes a waste heat circulation mechanism arranged between the outer box and the inner tank; The present invention effectively reduces the heating time of the heating gun and speeds up the feeding speed of the metal section material, thereby greatly reducing the fuel consumption to achieve the purpose of energy conservation and environmental protection. At the same time, it effectively ensures the production efficiency and eliminates potential safety hazards. Even if the operator accidentally touches the exhaust pipe or the outer wall of the furnace body, they will not be scalded.

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 situation of the above-mentioned prior art, the technical problem to be solved by the present invention is to provide an energy-saving heating furnace that makes full and reasonable use of the heat in the high-temperature tail gas that was originally directly discharged through a heat energy recovery system, greatly reducing the fuel consumption, thereby achieving the purpose of energy conservation and environmental protection and effectively ensuring the production efficiency. It also effectively utilizes the heat radiated from the furnace chamber to the furnace body through a waste heat circulation mechanism to further save the fuel consumption, and at the same time eliminates potential 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 outlet 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 a heat insulation body and a furnace chamber arranged inside the heat insulation body, and is characterized in that:

[0009] It also includes a heat energy recovery system arranged between the air inlet of the heating gun and the inner tank. The heat energy recovery system includes a smoke guide pipe vertically inserted into the rear of the top of the inner tank and communicating with the inside of the inner tank, a heat absorption component vertically arranged on the top of the outer box and located above the smoke guide pipe, and a high-temperature blower fixed on the top of the outer box and located in front of the heat absorption component;

[0010] The heat absorption component includes a base fixed on the outer box, an outer sleeve pipe vertically fixed on the top of the base, a pipe cover horizontally fixed at the opening of the end of the outer sleeve pipe, and a metal bellows concentrically arranged inside the outer sleeve pipe. 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. A circular convection chamber is formed between the outer wall of the metal bellows and the inner wall of the outer sleeve pipe. The upper end of the smoke guide pipe sequentially passes through the top of the heat insulation body, the top of the outer box and the base and is internally communicated with the lower end opening of the metal bellows;

[0011] The heat absorption component also includes an air inlet pipe vertically arranged inside the circular convection chamber and located in front of the metal bellows, a first connecting pipe horizontally inserted through the front side of the outer sleeve pipe, and an air outlet pipe horizontally inserted through the front side of the outer sleeve pipe and communicating with the inside of the circular convection chamber and lower than the first connecting pipe. The upper end opening of the air inlet pipe is 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 hermetically inserted into the front side of the lower end of the air inlet pipe and is internally communicated 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 blower. 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.

[0012] Preferably, it further includes a waste heat recycling mechanism disposed between the outer box and the inner tank. The waste heat recycling mechanism includes an inner box fixed to the outside of the heat insulation body and placed in the outer box, and a second connecting pipe inserted into the top of the outer box. The upper, lower, left, and right outer walls of the inner box are respectively spaced a certain distance from the upper, lower, left, and right inner walls of the outer box, so as to form a rectangular annular convection cavity between the upper, lower, left, and right outer walls of the inner box and the upper, lower, left, and right inner walls of the outer box. The root opening of the second connecting pipe communicates with the inside of the rectangular annular convection cavity, and the end opening of the second connecting pipe is connected to the air inlet of the high-temperature blower. A plurality of air inlet holes are provided at the top of the outer box.

[0013] Preferably, the furnace includes a horizontally arranged heat preservation bottom plate, an arched heat preservation cover arranged on the top of the heat preservation bottom plate, a refractory bottom plate horizontally fixed on the top of the heat preservation bottom plate and located inside the arched heat preservation cover, an arched furnace top horizontally arranged on the top of the refractory bottom plate and located inside the arched heat preservation cover, and a material guiding plate horizontally arranged on the top of the refractory bottom plate and located inside the arched furnace top. A heating furnace cavity is formed between the top of the material guiding plate and the inner wall of the arched furnace top.

[0014] Preferably, the arched furnace top includes a plurality of arched heating covers arranged end to end in sequence from front to back, and the material guiding plate includes a plurality of material guiding blocks arranged end to end in sequence from front to back; a plurality of material guiding grooves are formed at the top of each material guiding block and arranged in sequence from left to right. A heating furnace channel is formed between the material guiding grooves located on the same horizontal line on each material guiding block.

[0015] Preferably, a slope inclined downward is formed at the edge of the rear opening of each material guiding groove, and the edge of the end of the slope on each material guiding groove is lower than the edge of the front opening of a material guiding groove behind it; the width of the end opening of the slope is greater than the width of the rear opening of the material guiding groove.

[0016] Preferably, an inclined surface with a higher front and lower rear is also formed between the left edge of the top opening of the leftmost material guiding groove and the left edge of the top of the material guiding block, and between the right edge of the top opening of the rightmost material guiding groove and the right edge of the top of the material guiding block.

[0017] Preferably, the heat absorption component further includes a heat insulation cylinder coaxially sleeved outside the outer sleeve. The lower opening of the heat insulation cylinder is fixed to the top of the base, and the first connecting pipe and the air outlet pipe both pass through the heat insulation cylinder.

[0018] Preferably, the furnace further includes an arched fireproof board disposed between the arched heat preservation cover and the arched furnace top.

[0019] Preferably, a plurality of fans are embedded in the bottom of the outer box and are distributed in sequence from front to back. The air outlet of each fan is arranged upward and is in communication with the inside of the rectangular annular convection chamber.

[0020] Preferably, a plurality of vertically arranged support plates are fixed between the outer wall of the bottom of the inner box and the inner wall of the bottom of the outer box and are arranged in sequence from front to back, so that a certain distance is provided between the outer wall of the bottom of the inner box and the inner wall of the bottom of the outer box. A plurality of ventilation gaps are formed in the upper and lower edges of each support plate and are distributed in sequence from left to right.

[0021] Compared with the prior art, the advantages of the present invention are as follows:

[0022] (1) The present invention absorbs most of the heat in the high-temperature tail gas generated by the heating furnace by means of the 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. Then, the basic temperature of the room-temperature air is significantly increased, and then the heated air is sent into the heating gun by the high-temperature blower to participate in the combustion of the fuel. Thus, the difference between the basic temperature and the target temperature is significantly reduced, and the heating time of the heating gun is effectively reduced and the feeding speed of the metal billet is increased. Therefore, the fuel consumption is greatly reduced to achieve the purpose of energy conservation and environmental protection. Moreover, the heat in the high-temperature tail gas that was originally directly discharged is fully and reasonably utilized, and the production efficiency is effectively ensured.

[0023] (2) The present invention introduces the air that is located inside the rectangular annular convection chamber and has a temperature higher than the room temperature into the circular annular convection chamber by means of the waste heat circulation mechanism as the incoming air flow of the high-temperature blower. Thus, the heat radiated from the furnace chamber to the furnace body is effectively utilized, and the temperature of the air entering the circular annular convection chamber is further increased to further reduce the difference between the basic temperature and the target temperature. Therefore, the fuel consumption is further saved.

[0024] (3) The present invention not only significantly reduces the temperature of the exhaust pipe by absorbing the heat in the high-temperature tail gas, but also effectively reduces the temperature of the outer wall of the furnace body by absorbing the heat radiated from the furnace chamber to the furnace body. Thus, potential safety hazards are eliminated, and even if the operator accidentally touches the exhaust pipe or the outer wall of the furnace body, they will not be scalded. Description of the Drawings

[0025] Combined with the drawings and referring to the following specific embodiments, the above and other features, advantages and aspects of the embodiments of the present application will become more obvious; throughout the drawings, the same or similar reference numerals represent the same or similar elements; it should be understood that the drawings are schematic, and the original components and elements are not necessarily drawn to scale; in the drawings:

[0026] Figure 1 It is a right front top view exploded structure diagram of the present invention.

[0027] Figure 2 It is a right-side sectional view structure diagram of the heat energy recovery system of the present invention.

[0028] Figure 3 It is a top-side structure diagram of the metal bellows of the present invention.

[0029] Figure 4 It is a right-front-side exploded structure diagram of the inner container of the present invention.

[0030] Figure 5 It is an exploded view of the material guiding plate of the present invention.

[0031] Figure 6 It is a right-front-side bottom view structure diagram of the present invention. Specific Embodiments

[0032] Hereinafter, embodiments of the present application will be described in more detail with reference to the accompanying drawings. Although some embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. On the contrary, these embodiments are provided to more thoroughly and completely understand the present application. It should be understood that the drawings and embodiments of the present application are only for exemplary purposes and are not used to limit the protection scope of the present application.

[0033] It should be understood that the various steps recited in the method embodiments of the present application can be executed in different orders and / or in parallel. In addition, the method embodiments may include additional steps and / or omit the steps shown. The scope of the present application is not limited in this regard.

[0034] The term "including" and its variants used herein are open-ended, that is, "including but not limited to". The term "based on" means "at least partially based 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"; the relevant definitions of other terms will be given in the following description.

[0035] It should be noted that the concepts such as "first" and "second" mentioned in the present application are only used to distinguish different devices, modules or units, and are not used to limit the order or mutual dependency relationship of the functions executed by these devices, modules or units.

[0036] It should be noted that the modifications of "one" and "multiple" mentioned in the present application are illustrative rather than restrictive. Those skilled in the art should understand that unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0037] As Figures 1 to 6As shown in the figure, an energy-saving heating furnace includes a furnace body 1 and a heating gun 2 arranged in front of the furnace body 1. The furnace body 1 includes an outer box 11 and an inner tank 12 arranged inside the outer box 11. The front and rear sides of the outer box 11 are respectively provided with a discharge hole 111 and a feed hole 112. The position of the front end opening of the inner tank 12 is matched with the position of the discharge hole 111. The flame outlet 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. The inner tank 12 includes a heat insulation body 121 and a furnace chamber 122 arranged inside the heat insulation body 121;

[0038] It further includes a heat energy recovery system 3 arranged between the air inlet of the heating gun 2 and the inner tank 12. The heat energy recovery system 3 includes a smoke guide pipe 31 vertically inserted into the rear of the top of the inner tank 12 and communicating with the inside of the inner tank 12, a heat absorption component 32 vertically arranged on the top of the outer box 11 and located above the smoke guide pipe 31, and a high-temperature blower 33 fixed on the top of the outer box 11 and located in front of the heat absorption component 32;

[0039] The heat absorption component 32 includes a base 321 fixed on the outer box 11, an outer sleeve pipe 322 vertically fixed on the top of the base 321, a pipe cover 327 horizontally fixed at the opening of the end of the outer sleeve pipe 322, and a metal bellows 323 concentrically arranged inside the outer sleeve pipe 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 on the top of the base 321. A circular convection chamber 329 is formed between the outer wall of the metal bellows 323 and the inner wall of the outer sleeve pipe 322. The upper end of the smoke guide pipe 31 sequentially passes through the top of the heat insulation body 121, the top of the outer box 11, and the base 321 and is internally communicated with the lower end opening of the metal bellows 323;

[0040] The heat absorption component 32 further includes an air inlet pipe 324 vertically arranged inside the circular convection chamber 329 and located in front of the metal bellows 323, a first connecting pipe 325 horizontally inserted through the front side of the outer sleeve pipe 322, and an air outlet pipe 326 horizontally inserted into the front side of the outer sleeve pipe 322 and internally communicated with the inside of the circular convection chamber 329 and lower than the first connecting pipe 325. The upper end opening of the air inlet pipe 324 is 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 hermetically inserted into the front side of the lower end of the air inlet pipe 324 and is internally communicated 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 blower 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.

[0041] The heat absorption component 32 further includes a heat insulation cylinder 328 coaxially sleeved outside the outer sleeve 322. The lower end opening of the heat insulation cylinder 328 is fixed to the top of the base 321, and both the first connecting pipe 325 and the air outlet pipe 326 pass through the heat insulation cylinder 328.

[0042] A groove 3281 is formed at the front side edge of the lower end opening of the heat insulation cylinder 328, and both the first connecting pipe 325 and the air outlet pipe 326 pass through the groove 3281.

[0043] The working principle of the heat energy recovery system 3 is as follows:

[0044] After the heating gun 2 is ignited, it will generate a high-temperature flame. The high-temperature flame is sprayed into the inner tank 12 through the material outlet hole 111 and the front end opening of the inner tank 12. The metal section material is pushed into the furnace chamber 122 through the material inlet hole 112 and moves forward. The high-temperature flame heats the metal section material located in the furnace chamber 122. The high-temperature exhaust gas generated during the heating process enters the metal bellows 323 through the smoke guide pipe 31 and is discharged out through the upper end opening of the metal bellows 323. However, during the process of passing through the metal bellows 323, the heat of the high-temperature exhaust gas will be transferred to the metal bellows 323; at the same time, after starting the high-temperature fan 33 to work, 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 be blown towards 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 chamber 329, and finally enters the air inlet of the heating gun 2 through the air outlet pipe 326 to participate in the fuel combustion inside the heating gun 2. During the process of the air circulating from top to bottom inside the annular convection chamber 329, the heat on the metal bellows 323 will be transferred to the air through the principle of heat convection, thereby effectively increasing the temperature of the air entering the heating gun 2 to participate in 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 it can increase the contact area between the metal bellows 323 and the high-temperature exhaust gas by using the curved and undulating outer peripheral surface of the metal bellows 323 to improve the heat absorption efficiency, and at the same time, it can also increase the contact area between the metal bellows 323 and the air located inside the annular convection chamber 329 by using the curved and undulating inner peripheral surface of the metal bellows 323 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, they will be scalded. Therefore, the present invention is provided with a heat insulation cylinder 328 to prevent the operator from directly contacting the outer sleeve 322, thereby preventing the occurrence of scalding.

[0045] An energy-saving heating furnace further includes a waste heat recycling mechanism disposed between the outer box 11 and the inner tank 12. The waste heat recycling mechanism includes an inner box 4 fixed to the outside of the heat insulation body 121 and placed in the outer box 11, and a second connecting pipe 5 inserted into the top of the outer box 11. The upper, lower, left, and right outer walls of the inner box 4 are respectively spaced a certain distance from the upper, lower, left, and right inner walls of the outer box 11, so that a rectangular annular convection chamber 6 is formed between the upper, lower, left, and right outer walls of the inner box 4 and the upper, lower, left, and right inner walls of the outer box 11. The root opening of the second connecting pipe 5 communicates with the inside of the rectangular annular convection chamber 6, and the end opening of the second connecting pipe 5 is connected to the air inlet of the high-temperature fan 33. A plurality of air inlet holes 113 are opened at the top of the outer box 11.

[0046] The furnace chamber 122 includes a horizontally arranged heat preservation bottom plate 1221, an arched heat preservation cover 1222 arranged on the top of the heat preservation bottom plate 1221, a refractory bottom plate 1223 horizontally fixed on the top of the heat preservation bottom plate 1221 and located inside the arched heat preservation cover 1222, an arched furnace top horizontally arranged on the top of the refractory bottom plate 1223 and located inside the arched heat preservation cover 1222, and a material guiding plate horizontally arranged on the top of the refractory bottom plate 1223 and located inside the arched furnace top. A heating furnace chamber 1227 is formed between the top of the material guiding plate and the inner wall of the arched furnace top.

[0047] The working principle of the waste heat recycling mechanism is as follows:

[0048] Although a heat insulation body 121 is provided outside the furnace chamber 122 to reduce heat loss, there is still a certain amount of heat radiated outward. During the radiation process, the air inside the rectangular annular convection chamber 6 will be heated up, which will further cause the temperature of the outer box 11 to rise. Once the operator touches the outer wall of the outer box 11, there is a risk of scalding. When the high-temperature fan 33 works, the air inlet of the high-temperature fan 33 will draw the air inside the rectangular annular convection chamber 6 through the second connecting pipe 5 and send it into the circular annular convection chamber 329, and the external normal-temperature air will enter the inside of the rectangular annular convection chamber 6 through the plurality of air inlet holes 113. In this way, an air circulation is also formed. The continuously entering normal-temperature air inside the rectangular annular convection chamber 6 will continuously take away the heat radiated from the furnace chamber 122, thereby effectively reducing the temperature of the outer box 11 and eliminating 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 has been preliminarily heated inside the rectangular annular convection chamber 6, thereby further increasing the basic temperature of the air entering the circular annular convection chamber 329, and finally further increasing the temperature of the air sent into the heating gun 2, thus further saving the consumption of fuel.

[0049] The arch-shaped furnace roof comprises a plurality of arch-shaped heating covers 1224 arranged end to end in sequence from front to back, and the material guide plate comprises a plurality of material guide blocks 1225 arranged end to end in sequence from front to back; the advantages of such a design are as follows: since the temperature in the heating furnace cavity 1227 can reach over 1400 degrees, and the heat conductivity of the high-temperature resistant materials used for making the material guide blocks 1225 and the arch-shaped heating covers 1224 is poor, resulting in a slow heat transfer rate. If the length of the high-temperature resistant material is long, the high-temperature resistant material will crack due to the large temperature difference between hot and cold. Therefore, both the arch-shaped furnace roof and the material guide plate adopt a design of dividing the whole into parts. The shorter arch-shaped heating covers 1224 and material guide blocks 1225 will not crack when heated, thus extending the service life; at the same time, the total lengths of the arch-shaped furnace roof and the material guide plate can be changed by increasing or decreasing the number of arch-shaped heating covers 1224 and material guide blocks 1225 as needed, making it more flexible in use without the need to customize arch-shaped furnace roofs and material guide plates of various length specifications for easy production; in addition, it is also convenient for processing and transportation. If an individual arch-shaped heating cover 1224 or material guide block 1225 is damaged, only the damaged arch-shaped heating cover 1224 or material guide block 1225 needs to be replaced separately.

[0050] A plurality of material guide grooves 12251 are formed at the top of each material guide block 1225 and arranged in sequence from left to right. A heating furnace channel 1228 is formed between the material guide grooves 12251 on the same horizontal straight line of each material guide block 1225. The metal section material entering the inner tank 12 from the feed hole 112 will fall into the heating furnace channel 1228 and move forward along the heating furnace channel 1228, thus playing a role in positioning and guiding.

[0051] At the edge of the rear opening of each material guiding groove 12251, a slope 12252 that is inclined downward is formed downward. The end edge of the slope 12252 on each material guiding groove 12251 is lower than the edge of the front opening of a material guiding groove 12251 behind it. The advantage of this design is that due to the limited dimensional accuracy and assembly accuracy of the material guiding block 1225, it is impossible to make the adjacent two material guiding blocks 1225 completely flush. As a result, when the material guiding grooves 12251 on the two adjacent material guiding blocks 1225 that are on the same horizontal line are joined together, the edge of the rear opening of the front material guiding groove 12251 may be higher than the edge of the front opening of the rear material guiding groove 12251. Therefore, when the metal section moves horizontally from back to front, the front end of the metal section is blocked by the edge of the rear opening of the material guiding groove 12251 on a material guiding block 1225 in front of it and cannot continue to move. However, due to the design of the slope 12252, the end edge of the slope 12252 on each material guiding groove 12251 is lower than the edge of the front opening of a material guiding groove 12251 behind it. So when the metal section moves horizontally from back to front, the metal section can always smoothly move into the corresponding material guiding groove 12251 in front, thus completely avoiding the occurrence of material blockage.

[0052] The width of the end opening of the slope 12252 is greater than the width of the rear opening of the material guiding groove 12251. Between the left edge of the top opening of the leftmost material guiding groove 12251 and the left edge of the top of the material guiding block 1225, and between the right edge of the top opening of the rightmost material guiding groove 12251 and the right edge of the top of the material guiding block 1225, an inclined surface 12253 that is higher at the front and lower at the rear is formed. The advantage of this design is that between the adjacent side edges of the top openings of any two adjacent slopes 12252, an inner corner will be formed with the top of the material guiding block 1225. And between the left edge of the top opening of the leftmost material guiding groove 12251 and the left edge of the top of the material guiding block 1225, and between the right edge of the top opening of the rightmost material guiding groove 12251 and the right edge of the top of the material guiding block 1225, an outer corner will be formed. If the outer diameter of the metal section is relatively large, the left and right side edges of the bottom of the front end of the metal section will be blocked by the above-mentioned inner and outer corners, thus causing material blockage. However, since the width of the end opening of the slope 12252 is greater than the width of the rear opening of the material guiding groove 12251, the position of each inner corner can be shifted outward and distributed obliquely in this way. The setting of the two inclined surfaces 12253 can eliminate the two outer corners, so that the left and right side edges of the bottom of the front end of the metal section with a relatively large outer diameter can also always move forward smoothly, thus completely avoiding the occurrence of material blockage.

[0053] The furnace chamber 122 further includes an arched fireproof board 1226 disposed between the arched heat-insulating cover 1222 and the arched furnace top, aiming to prevent the flame from shooting upward through the gap between two adjacent arched heating covers 1224 and directly contacting the arched heat-insulating cover 1222, because the temperature resistance of the arched heat-insulating cover 1222 is relatively low and it will be burned out if directly contacting the flame.

[0054] The heat-insulating body 121 includes two vertically arranged heat-insulating side plates 1212 that are symmetrically and parallelly distributed on the left and right respectively, and two heat-insulating cover plates 1211 that are horizontally disposed between the two heat-insulating side plates 1212 and are symmetrically and parallelly distributed on the top and bottom respectively. A heat-insulating channel 1213 is formed between the two heat-insulating side plates 1212 and the two heat-insulating cover plates 1211. The furnace chamber 122 is disposed inside the heat-insulating channel 1213, and the heat-insulating bottom plate 1221 in the furnace chamber 122 is horizontally fixed on the top of a lower heat-insulating cover plate 1211.

[0055] The smoke guide pipe 31 is vertically inserted between an upper heat-insulating cover plate 1211, the arched heat-insulating cover 1222, the arched fireproof board 1226, and the last arched heating cover 1224 at the rear.

[0056] A plurality of fans 8 are sequentially distributed from front to back and embedded at the bottom of the outer box 11. The air outlet of each fan 8 is arranged upward and is in communication with the inside of the rectangular annular convection chamber 6; when it is necessary to increase the air flow rate entering the inside of the rectangular annular convection chamber 6, one or more of the fans 8 can be turned on to enable the external normal-temperature air to quickly enter the inside of the rectangular annular convection chamber 6.

[0057] A plurality of vertically arranged and sequentially arranged support plates 7 are also fixed between the bottom outer wall of the inner box 4 and the bottom inner wall of the outer box 11 to keep a certain distance between the bottom outer wall of the inner box 4 and the bottom inner wall of the outer box 11. A plurality of ventilation notches 71 are arranged in sequence from left to right on the upper and lower edges of each support plate 7.

[0058] The inner box 4 includes a top plate 41 horizontally fixed on the top of the heat-insulating body 121 and two enclosing plates 42 fixed on the left and right sides of the top plate 41 and symmetrically disposed on the left and right sides of the heat-insulating body 121 respectively. A horizontally arranged supporting plate 421 is formed at the lower side edges of the two enclosing plates 42 and extends towards the bottom of the heat-insulating body 121. The tops of the two supporting plates 421 are fixed to the bottom of the heat-insulating body 121, and the opposite side edges of the two supporting plates 421 are fixed to each other. The upper side edge of each support plate 7 is fixed between the bottom outer walls of the two supporting plates 421.

[0059] A plurality of first heat dissipation holes 411 are formed in the top plate 41, and a plurality of second heat dissipation holes 422 are formed in the supporting plate 421, so as to orderly guide the heat flowing out from the inner container 12 to the rectangular annular convection chamber 6.

[0060] 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 them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various 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 includes an outer box and an inner tank arranged inside the outer box. Feeding holes and discharging holes are respectively arranged on the front and rear sides of the outer box. The position of the front-end opening of the inner tank is matched with the position of the discharging hole. The flame outlet of the heating gun is arranged backward and is aligned with the front-end opening of the inner tank through the discharging hole. The inner tank includes a heat-insulating body and a furnace chamber arranged inside the heat-insulating body. It is characterized in that: It further includes a heat energy recovery system arranged between the air inlet of the heating gun and the inner tank. The heat energy recovery system includes a smoke guide pipe vertically inserted behind the top of the inner tank and communicating with the inside of the inner tank, a heat absorption component vertically arranged on the top of the outer box and located above the smoke guide pipe, and a high-temperature blower fixed on the top of the outer box and located in front of the heat absorption component; The heat absorption component includes a base fixed on the outer box, an outer sleeve pipe vertically fixed on the top of the base, a pipe cover horizontally fixed at the opening of the end of the outer sleeve pipe, and a metal bellows concentrically arranged inside the outer sleeve pipe. The upper opening of the metal bellows passes through the pipe cover and extends above the pipe cover. The lower opening of the metal bellows is fixed on the top of the base. An annular convection chamber is formed between the outer wall of the metal bellows and the inner wall of the outer sleeve pipe. The upper end of the smoke guide pipe sequentially passes through the top of the heat-insulating body, the top of the outer box and the base and is internally communicated with the lower opening of the metal bellows; The heat absorption component further includes an air inlet pipe vertically arranged inside the annular convection chamber and located in front of the metal bellows, a first connecting pipe horizontally inserted on the front side of the outer sleeve pipe, and an air outlet pipe horizontally inserted on the front side of the outer sleeve pipe and communicating with the inside of the annular convection chamber and lower than the first connecting pipe. The upper opening 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 opening of the first connecting pipe is hermetically inserted on the front side of the lower end of the air inlet pipe and is internally communicated with the inside of the air inlet pipe. The front opening of the first connecting pipe is connected to the air outlet of the high-temperature blower. The root opening of the air outlet pipe is close to the top of the base. The end opening of the air outlet pipe is connected to the air inlet of the heating gun; It further 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 outside the heat-insulating body and placed in the outer box and a second connecting pipe inserted on the top of the outer box. The upper, lower, left and right outer walls of the inner box are respectively spaced a certain distance from the upper, lower, left and right inner walls of the outer box so that a rectangular annular convection chamber is formed between the upper, lower, left and right outer walls of the inner box and the upper, lower, left and right inner walls of the outer box. The root opening of the second connecting pipe is internally communicated with the inside of the rectangular annular convection chamber. The end opening of the second connecting pipe is connected to the air inlet of the high-temperature blower. A plurality of air inlet holes are opened on the top of the outer box.

2. The energy-saving heating furnace according to claim 1, wherein, The furnace includes a horizontally arranged heat-insulating bottom plate, an arched heat-insulating cover arranged on the top of the heat-insulating bottom plate, a refractory bottom plate horizontally fixed on the top of the heat-insulating bottom plate and located inside the arched heat-insulating cover, an arched furnace top horizontally arranged on the top of the refractory bottom plate and located inside the arched heat-insulating cover, and a material guiding plate horizontally arranged on the top of the refractory bottom plate and located inside the arched furnace top. A heating furnace cavity is formed between the top of the material guiding plate and the inner wall of the arched furnace top.

3. The energy-saving heating furnace according to claim 2, characterized in that, The arched furnace top includes a plurality of arched heating covers arranged in sequence from front to back with their heads and tails connected. The material guiding plate includes a plurality of material guiding blocks arranged in sequence from front to back with their heads and tails connected. A plurality of material guiding grooves are formed on the top of each material guiding block and arranged in sequence from left to right. A heating furnace channel is formed between the material guiding grooves located on the same horizontal straight line on each material guiding block.

4. An energy-saving heating furnace according to claim 3, characterized in that, At the edge of the rear opening of each material guiding groove, a slope inclined downward is formed. The edge of the end of the slope on each material guiding groove is lower than the edge of the front opening of a material guiding groove behind it. The width of the end opening of the slope is greater than the width of the rear opening of the material guiding groove.

5. An energy-saving heating furnace according to claim 4, characterized in that, An inclined surface with a front-high and rear-low setting is also formed between the left edge of the top opening of the leftmost material guiding groove and the left edge of the top of the material guiding block, and between the right edge of the top opening of the rightmost material guiding groove and the right edge of the top of the material guiding block.

6. An energy-saving heating furnace according to claim 1, characterized in that, The heat absorption component further includes a heat-insulating cylinder coaxially sleeved outside the outer casing. The lower end opening of the heat-insulating cylinder is fixed on the top of the base. The first connecting pipe and the air outlet pipe both pass through the heat-insulating cylinder.

7. An energy-saving heating furnace according to claim 2, characterized in that, The furnace further includes an arched fireproof board arranged between the arched heat-insulating cover and the arched furnace top.

8. An energy-saving heating furnace according to claim 1, characterized in that, A plurality of fans are embedded in sequence from front to back at the bottom of the outer box. The air outlet of each fan faces upward and is communicated with the inside of the rectangular annular convection cavity.

9. An energy-saving heating furnace according to claim 1, characterized in that, A plurality of vertically arranged and sequentially distributed support plates are fixed between the outer wall of the bottom of the inner box and the inner wall of the bottom of the outer box to keep a certain distance between the outer wall of the bottom of the inner box and the inner wall of the bottom of the outer box. A plurality of ventilation notches are formed in sequence from left to right on both the upper and lower edges of each support plate.

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