Heating furnace

Abstract

The utility model relates to the technical field of heating furnaces, in particular to a heating furnace which comprises a furnace wall, a furnace bottom, a furnace top and a furnace door, the furnace wall is located above the furnace bottom, the furnace top is located above the furnace wall, and the furnace door is located on the furnace wall. The furnace wall comprises refractory bricks, first heat preservation cotton, a heat preservation plate, a first aerogel felt and a first profile steel shell which are combined into a whole in the direction from inside to outside of the hearth, and the furnace top comprises second heat preservation cotton, a second aerogel felt and a second profile steel shell which are combined into a whole in the direction from inside to outside of the hearth. The furnace door comprises third heat preservation cotton, third aerogel felt and a steel support which are combined into a whole in the direction of the hearth from inside to outside, the furnace bottom is formed by high-aluminum heavy bricks in a masonry mode, the first profile steel shell is fixedly arranged on the ground, and a plurality of high squats are arranged at the furnace bottom. The side wall face and the top wall face of the heating furnace are both arranged to be of a structure with the high heat preservation effect, so that the heat preservation effect of the heating furnace is improved, the furnace bottom is built by high-aluminum heavy bricks through a high-temperature binder, and the durability of the furnace bottom is enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of heating furnaces, and particularly relates to a heating furnace. Background Art

[0002] Most of the existing heating furnaces have poor heat preservation performance, resulting in high energy consumption. When heating small parts, the whole machine can only be started, and zoning is not possible. Due to the limitations of materials and construction techniques, there are defects in the furnace body, such as not comprehensively considering material matching, the structural design not considering material thermal attenuation, inaccurate temperature control, difficult heat preservation measures, maintenance plans, and safety management. It is impossible to design the whole process of material selection, design, construction, use, and maintenance of the heating furnace from the perspective of materials, resulting in the heating furnace becoming a high-energy-consuming production equipment.

[0003] The existing Chinese patent publication number is CN209197470U, which discloses a bottom refractory brick of a forging heating furnace, including a forging heating furnace. The forging heating furnace includes a furnace bottom, a furnace top, and a cleaning main body. The furnace top is fixedly connected to the upper end of the furnace bottom, and the cleaning main body is supported and installed on the outer side end of the furnace bottom. The furnace bottom includes a nano-microporous heat insulation board, a ceramic fiber board, a heat preservation brick, a heavy brick, a furnace wall, a refractory brick, a threshold, and screws. The inner side end of the nano-microporous heat insulation board is fixedly connected to the outer side end of the ceramic fiber board, the inner side end of the ceramic fiber board is fixedly connected to the outer side end of the heat preservation brick, the inner side end of the heat preservation brick is fixedly connected to the outer side end of the heavy brick, and the outer side end of the heavy brick is fixedly connected to the outer side end of the furnace wall. It solves the problems that the bottom of the existing forging furnace is made of clay bricks, with low strength, easy to damage, long construction time, high construction requirements, and short service life. However, there are still the following problems:

[0004] The furnace top and furnace door still adopt ordinary structures, so there are deficiencies in the heat preservation effect of the heating furnace, and the temperature outside the heating furnace does not decrease significantly. Summary of the Utility Model

[0005] The purpose of the utility model is to solve at least one problem in the background art. The utility model provides a heating furnace.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A heating furnace includes a furnace wall, a furnace bottom, a furnace top and a furnace door. The furnace wall is located above the furnace bottom, the furnace top is located above the furnace wall, and the furnace door is located on the furnace wall. Along the direction from the inside to the outside of the furnace chamber, the furnace wall is composed of refractory bricks, a first layer of thermal insulation cotton, a thermal insulation board, a first aerogel felt and a first section steel shell integrated together. Along the direction from the inside to the outside of the furnace chamber, the furnace top is composed of a second layer of thermal insulation cotton, a second aerogel felt and a second section steel shell integrated together. Along the direction from the inside to the outside of the furnace chamber, the furnace door is composed of a third layer of thermal insulation cotton, a third aerogel felt and a steel support integrated together. The furnace bottom is formed by laying high-aluminum heavy bricks, the first section steel shell is fixedly arranged on the ground, and multiple high pedestals are arranged on the furnace bottom.

[0008] In some embodiments, a gantry is arranged on one side of the first section steel shell where the furnace door is located. A first opening and closing power device is arranged on the gantry. The furnace door is connected to the first opening and closing power device through a chain assembly, and a locking device is arranged between the furnace door and the section steel shell.

[0009] In some embodiments, the furnace door includes an upper furnace door and a lower furnace door. The connection point of the upper furnace door and the lower furnace door is lower than the top of the high pedestal or at the same horizontal plane as the top of the high pedestal. The upper furnace door is connected to the first opening and closing power device through the chain assembly, and the lower furnace door is connected to a second opening and closing power device on the ground outside the furnace through a retraction assembly.

[0010] In some embodiments, multiple heating units are distributed on the inner wall of the furnace wall and the inner wall of the furnace door. The heating unit includes a resistance band, conductive rods respectively connected to both ends of the resistance band, and hook nails for hanging and fixing the resistance band. The hook nails are T-shaped. The top of the hook nail is embedded in the furnace wall, the bottom of the hook nail extends horizontally, and the free end of the tail bends in a direction away from the resistance band.

[0011] In some embodiments, the thickness ratio of the refractory bricks, thermal insulation cotton, thermal insulation board and aerogel felt is 23:22:1:4.

[0012] In some embodiments, the thickness ratio of the thermal insulation cotton and the aerogel felt is 23:2.

[0013] In some embodiments, the thickness ratio of the thermal insulation cotton and the aerogel felt is 23:2.

[0014] In some embodiments, the high pedestal supports a bottom plate. The bottom plate is a grid structure, and the high pedestal is provided with protrusions for positioning the bottom plate.

[0015] In some embodiments, the three furnace walls include a rear wall and two side walls. The heating areas of the two side walls are divided into a front heating area and a rear heating area. The heating area of one rear wall and the rear heating areas of the two side walls form a rear heating cavity, and the heating area of the furnace door and the front heating areas of the two side walls form a front heating cavity.

[0016] In some embodiments, at one end where the furnace top contacts the furnace wall, there is a first convex portion. A first concave portion is formed by connecting the furnace top body and the first convex portion. The furnace wall is provided with a second convex portion, and a second concave portion is formed by connecting the furnace wall body and the second convex portion. The first convex portion cooperates with the second concave portion, and the second convex portion cooperates with the first concave portion;

[0017] At one end where the furnace wall contacts the furnace door, there is a third convex portion. At one end where the furnace bottom contacts the furnace door, there is a fourth convex portion extending along the direction of the furnace top. On both side ends of the furnace door, there are fourth concave portions that cooperate with the third convex portion. At the bottom end of the furnace door, there is a fourth concave portion that cooperates with the fourth convex portion. The heat insulation cotton and the heat insulation board at the top end of the furnace door extend outside the steel profile shell.

[0018] The utility model has the following beneficial effects:

[0019] 1. In the utility model, the furnace door is used to close the furnace opening. The furnace wall, furnace top, and furnace door cooperate to form a heating furnace. By arranging that the furnace wall includes refractory bricks, first heat insulation cotton, heat insulation boards, first aerogel felt, and a first steel profile shell, the furnace top includes second heat insulation cotton, second aerogel felt, and a second steel profile shell, and the furnace door includes third heat insulation cotton, third aerogel felt, and a steel support, the side wall surface and the top wall surface of the heating furnace are both set to structures with high heat insulation effects, thereby improving the heat insulation effect of the heating furnace. The furnace bottom is made of high-aluminum heavy-duty bricks and is built with a high-temperature binder to enhance the durability of the furnace bottom. Multiple high pedestals cooperate to support the bottom plate.

[0020] 2. The furnace wall adopts a structure of mullite bricks and cotton, and the inner linings of the furnace door and furnace top both adopt a full-fiber composite structure; the heating elements are arranged in the effective areas of the furnace door - two side walls - rear wall, with uniform heat generation, reliable temperature rise, and a uniform overall heating surface. The heating unit is divided into two front and rear areas and operates separately to save energy and reduce consumption. Starting from the material properties of the selected materials, the utility model combines the properties of each material to formulate the most cost-effective solution, and optimizes the connection structure therein to increase reliability. The factors of thermal expansion and contraction are considered in the initial design to avoid the equipment cracking and leaking earlier, further avoiding energy loss and extending the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a longitudinal sectional structure schematic diagram of a heating furnace proposed by the utility model;

[0022] Figure 2 Schematic cross-sectional structure diagram of the furnace wall of a heating furnace proposed by the present utility model;

[0023] Figure 3 Schematic three-dimensional mechanism diagram of the stud of a heating furnace proposed by the present utility model;

[0024] Figure 4 Schematic structure diagram of the contact between the furnace wall and the furnace top of a heating furnace proposed by the present utility model;

[0025] Figure 5 Schematic structure diagram of the contact between the furnace wall and the furnace bottom of a heating furnace proposed by the present utility model.

[0026] Reference numerals: 1 - First section steel shell; 2 - Furnace door; 3 - Gantry; 4 - Resistance band; 5 - Conductive bar; 6 - Stud; 7 - Furnace wall; 8 - Refractory brick; 9 - First heat-insulating cotton; 10 - Heat-insulating board; 11 - First aerogel felt; 12 - Furnace top; 13 - Second heat-insulating cotton; 14 - Second aerogel felt; 15 - Second section steel shell; 16 - Furnace bottom; 17 - Bottom plate; 18 - High squat; 19 - Third heat-insulating cotton; 20 - Third aerogel felt. Detailed implementation manners

[0027] In order to make the objectives, technical solutions and advantages of the present utility model clearer and more understandable, the present utility model is further described in detail. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model, that is, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments.

[0028] In the present utility model, the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal", etc. is based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present utility model and its embodiments, and are not used to limit that the indicated devices, elements or components must have a specific orientation, or be constructed and operated in a specific orientation.

[0029] Moreover, in addition to being able to represent the orientation or positional relationship, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the present utility model can be understood according to specific circumstances.

[0030] In addition, the terms "installed", "set up", "equipped with", "connected", and "linked" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. For those of ordinary skill in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0031] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, components, or parts (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, components, or parts. Unless otherwise specified, the meaning of "a plurality" is two or more.

[0032] Specifically, this embodiment provides a heating furnace, as shown in the appendix Figures 1-3 and may include:

[0033] It includes a furnace wall 7, a furnace bottom 16, a furnace top 12, and a furnace door 2. The furnace wall 7 is located above the furnace bottom 16, the furnace top 12 is located above the furnace wall 7, and the furnace door 2 is located on the furnace wall 7; along the direction from the inside to the outside of the furnace chamber, the furnace wall 7 is composed of a refractory brick 8, a first thermal insulation cotton 9, a heat insulation board 10, a first aerogel felt 11, and a first section steel shell 1 integrated together. Along the direction from the inside to the outside of the furnace chamber, the furnace top 12 is composed of a second thermal insulation cotton 13, a second aerogel felt 14, and a second section steel shell 15 integrated together. Along the direction from the inside to the outside of the furnace chamber, the furnace door 2 is composed of a third thermal insulation cotton 19, a third aerogel felt 20, and a steel bracket integrated together. The furnace bottom 16 is formed by laying high-aluminum heavy-duty bricks, the first section steel shell is fixedly arranged on the ground, and the furnace bottom 16 is provided with a plurality of high pedestals 18.

[0034] In this embodiment, the furnace door 2 is used to close the furnace opening. The furnace wall 7, the furnace top 12, and the furnace door 2 cooperate to form a heating furnace. Through the settings that the furnace wall 7 includes a refractory brick 8, a first thermal insulation cotton 9, a heat insulation board 10, a first aerogel felt 11, and a first section steel shell 1, the furnace top 12 includes a second thermal insulation cotton 13, a second aerogel felt 14, and a second section steel shell 15, and the furnace door 2 includes a third thermal insulation cotton 19, a third aerogel felt 20, and a steel bracket, the side wall surface and the top wall surface of the heating furnace are both set to structures with high heat insulation effects, thereby improving the heat insulation effect of the heating furnace. The furnace bottom 16 is laid by high-aluminum heavy-duty bricks with a high-temperature binder, enhancing the durability of the furnace bottom 16, and a plurality of high pedestals 18 cooperate to support the bottom plate 17.

[0035] Preferably, the furnace top 12 and the furnace wall 7 are movably connected.

[0036] Preferably, the heating furnace is a cuboid.

[0037] Preferably, the heating furnace includes three furnace walls 7, one furnace bottom 16, one furnace top 12, and one furnace door 2. Excluding the furnace door 2 and the ground, two sides are formed by four sides, and the adjacent sides of the profiled steel shells of the three furnace walls 7 are welded discontinuously.

[0038] Preferably, a plurality of high pedestals 18 are arranged in a matrix.

[0039] Preferably, the first heat insulation cotton 9, the heat insulation board 10, the first aerogel felt 11, and the first profiled steel shell 1 can be fixed into one body by fixing members, the second heat insulation cotton 13, the second aerogel felt 14, and the second profiled steel shell 15 can be fixed into one body by fixing members, and the third heat insulation cotton 19, the third aerogel felt 20, and the steel bracket can be fixed into one body by fixing members. The fixing members include but are not limited to bolts.

[0040] In some embodiments, a gantry 3 is provided on one side of the first profiled steel shell where the furnace door 2 is located. The gantry 3 is provided with a first opening and closing power device. The furnace door 2 is connected to the opening and closing power device through a chain assembly, and a locking device is provided between the furnace door 2 and the profiled steel shell.

[0041] In this embodiment, the arrangement of the chain assembly and the opening and closing power device facilitates the rising (opening) and falling (closing) of the furnace door 2.

[0042] In some embodiments, the furnace door 2 includes an upper furnace door and a lower furnace door. The connection point of the upper furnace door and the lower furnace door is lower than the top of the high pedestal 18 or is at the same horizontal plane as the top of the high pedestal 18. The upper furnace door is connected to the first opening and closing power device through the chain assembly, and the lower furnace door is connected to a second opening and closing power device on the ground outside the furnace through a contraction assembly.

[0043] In this embodiment, through the arrangement of the upper furnace door and the lower furnace door, when taking out the heated parts in the furnace, only the upper furnace door needs to be opened, avoiding the simultaneous opening of the upper furnace door and the lower furnace door, which may cause the furnace opening to be too large and result in excessive loss of the furnace temperature, causing a large drop in the furnace temperature. The second opening and closing power device is arranged on the ground to lift and lower the lower furnace door. When the furnace opening needs to be fully opened, the second opening and closing power device drives the lower furnace door to descend. When the lower furnace door closes the heating furnace, there is a space for the lower furnace door to descend between the lower furnace door and the ground, and the top end of the lower furnace door after descending is lower than the furnace bottom 16 or is at the same plane as the furnace bottom 16.

[0044] In some embodiments, a fifth convex portion is provided at one end of the upper furnace door in contact with the lower furnace door. A fifth concave portion is formed by connecting the upper furnace door body and the fifth convex portion. The lower furnace door is provided with a sixth convex portion, and a sixth concave portion is formed by connecting the lower furnace door body and the sixth convex portion. The fifth convex portion cooperates with the sixth concave portion, and the sixth convex portion cooperates with the fifth concave portion, so that after the upper furnace door and the lower furnace door are connected, they are prevented from being connected to form a flat surface, thereby preventing heat in the furnace from escaping through the connection site between the upper furnace door and the lower furnace door.

[0045] In some embodiments, a plurality of heating units are distributed on the inner wall of the furnace wall 7 and the inner wall of the furnace door 2. The heating unit includes a resistance band 4, conductive rods 5 respectively connected to both ends of the resistance band 4, and hook nails 6 for hanging and fixing the resistance band 4. The hook nails 6 are T-shaped. The top of the hook nails 6 is embedded in the furnace wall 7, and the bottom of the hook nails 6 extends horizontally and the free end of the tail bends in a direction away from the resistance band 4.

[0046] In this embodiment, through the arrangement of the resistance band 4, the conductive rods 5 and the hook nails 6, the reliability of the position where the heating unit is fixed is higher and it is not easy to fall off.

[0047] Preferably, the heating units are distributed in an array, specifically arranged in multiple rows.

[0048] Preferably, the thickness ratio of the refractory brick 8, the first heat-insulating cotton 9, the heat-insulating board 10 and the first aerogel felt 11 is 23:22:1:4.

[0049] Preferably, the thickness of the furnace wall 7 is 500 mm.

[0050] Preferably, the thickness ratio of the second heat-insulating cotton 13 and the second aerogel felt 14 is 23:2.

[0051] Preferably, the thickness of the furnace top 12 is 500 mm.

[0052] Preferably, the thickness ratio of the third heat-insulating cotton 19 and the third aerogel felt 20 is 23:2.

[0053] Preferably, the thickness of the furnace door 2 is 500 mm.

[0054] Preferably, the thickness of the furnace bottom 16 is 650 mm.

[0055] In this embodiment, through the structural arrangement in the furnace wall 7, the furnace top 12, the furnace bottom 16 and the furnace door 2, the leakage of the sealing temperature is further avoided, the heat-insulating effect is improved, thereby having the effect of energy saving, and the temperature on the furnace surface can be controlled within 55 °C, preferably controlled within 40 - 50 °C.

[0056] In some embodiments, the high squat 18 supports a bottom plate 17, the bottom plate 17 is a grid structure, and the high squat 18 is provided with a protrusion for positioning the bottom plate 17.

[0057] In this embodiment, the setting of the bottom plate 17 as a grid facilitates the placement of the parts to be heated on the grid of the bottom plate 17. Through the setting of the protrusion on the high squat 18, the protrusion can be used to position the bottom plate 17.

[0058] In some embodiments, three sides of the furnace wall 7 include a rear wall and two side walls. The heating areas of the two side walls are divided into a front heating area and a rear heating area. The heating area of the rear wall and the rear heating areas of the two side walls form a post-heating cavity, and the heating area of the furnace door 2 and the front heating areas of the two side walls form a pre-heating cavity.

[0059] In this embodiment, the setting of the heating area is to provide sufficient and uniform heat.

[0060] Preferably, the heating power of the post-heating cavity is equal to that of the pre-heating cavity, and the heating power of both is 90 kw.

[0061] In some instances, as Figure 4 shown, one end of the furnace top 12 in contact with the furnace wall 7 is provided with a first protrusion portion. A first concave portion is formed by connecting the main body of the furnace top 12 with the first protrusion portion. The furnace wall 7 is provided with a second protrusion portion. A second concave portion is formed by connecting the main body of the furnace wall 7 with the second protrusion portion. The first protrusion portion cooperates with the second concave portion, and the second protrusion portion cooperates with the first concave portion.

[0062] In this embodiment, through the structural setting of the contact part between the furnace top 12 and the furnace wall 7, the contact gap between the furnace top 12 and the furnace wall 7 is not a linear contact, thereby improving the sealing effect of the heating furnace and avoiding heat leakage.

[0063] Preferably, when the furnace top 12 is in contact with the furnace wall 7, the first protrusion and the second protrusion can abut against each other, and the abutting surface between the first protrusion and the second protrusion is set as a wedge surface to further ensure the sealing effect.

[0064] Preferably, the first protrusion portion and the second protrusion portion are partial protrusions of the section steel shell structure.

[0065] In some instances, as Figure 5 shown, one end of the furnace wall 7 in contact with the furnace door 2 is provided with a third protrusion portion. One end of the furnace bottom 16 in contact with the furnace door 2 is provided with a fourth protrusion portion extending along the direction of the furnace top 12. The two side ends of the furnace door 2 are provided with fourth concave portions cooperating with the third protrusion portion. The bottom end of the furnace door 2 is provided with a fourth concave portion cooperating with the fourth protrusion portion. The third heat insulation cotton 19 at the top end of the furnace door 2 extends outside the section steel shell.

[0066] In this embodiment, the cooperation between the convex part and the concave part makes the contact gaps between the furnace door 2 and the furnace wall 7 and the furnace bottom 16 not in linear contact, thereby improving the sealing effect of the heating furnace. Further, as shown in Figure 5 shown, by arranging the fourth convex part to extend along the direction of the furnace top 12, it is convenient for the fourth concave part of the furnace door 2 to cooperate with the fourth convex part of the furnace bottom 16 when the furnace door 2 descends (closes). The third heat-insulating cotton 19 in the top end of the furnace door 2 extends outside the profiled steel shell to facilitate pressing the furnace door 2 against the furnace top 12, further improving the sealing effect of the heating furnace.

[0067] Preferably, the third convex part and the fourth convex part are protrusions of the profiled steel shell structure part, and the third concave part and the fourth concave part are depressions of the heat-insulating cotton structure part.

[0068] Preferably, the mating surface between the fourth convex part and the fourth concave part is set as a wedge surface to facilitate pressing the furnace door 2 against the furnace wall 7 and the furnace bottom 16.

[0069] In some embodiments, the refractory brick 8 is a mullite brick, the heat-insulating cotton is a heat-insulating cotton folding block - 512 zirconium-containing type, and the heat-insulating board 10 is a nano high-temperature board. The resistance belt 4 is a Kanthal A1 type 20x1.5 resistance belt 4, a 0Cr27Al7Mo2 high-temperature resistance belt 4.

[0070] Specifically, building a heating furnace at 1200 °C includes the following steps. Technical details such as the common practices and relatively simple and commonly used conduction, locking, etc. in the industry that are not within the scope of this solution creation will not be elaborated here. The omitted details that are not exhaustive do not prevent those skilled in the art from implementing this solution.

[0071] The furnace body steel structure is composed of profiled steel and steel plates welded together. The furnace wall steel plates are naturally divided according to the profiled steel frame, and are spliced in a separated manner and intermittently welded to the profiled steel frame to avoid overall deformation of the steel plates after being heated; the side wall profiled steel columns are all calculated according to the strength under the heated condition, and the selected type is appropriate and reliable; the lower part of the column is welded to the embedded steel plate at the construction site, and the upper part is connected to the ring beam of the furnace top 12. In this way, the entire furnace body steel structure forms an integral frame structure, improving the strength and ensuring balanced stress.

[0072] On the furnace mouth panel, a reserved port for TUS temperature measurement is respectively provided on the left and right for furnace temperature calibration.

[0073] A steel structure safety climbing ladder is installed on the side or back of the furnace body, and a safety walkway is provided on the furnace top 12 for easy maintenance. Safety protection fences are provided for both the platform and the ladder.

[0074] On both sides and the rear wall of the furnace wall, mullite prefabricated parts are used, and at the top, a refractory insulation cotton folding insulation blanket is used. The bottom of the furnace chamber is made of a special heavy-duty high-alumina insulation material. A layer of aerogel felt is laid on all six sides of the furnace body. The bottom of the furnace 16 is made of a high-temperature binder; it can bear a load of more than 2 tons; the heating elements are arranged in the effective area of the furnace door 2 - both side walls - rear wall, with uniform heat generation, reliable temperature rise, and a uniform overall heating surface. The temperature control is accurate, reaching ±8°C. And it can be zone-controlled. For example, the heating temperature of the heating elements in the middle position is 1100°C, and the heating temperature of the heating elements near the cold point is 1110°C, so that the temperature in the furnace is kept constant at 1100°C

[0075] At the furnace door 2 opening, prefabricated parts are used in combination with the structure of the furnace door 2, and the furnace door 2 opening adopts a flat-top structure. After being dried by the process, it has high structural strength at high temperatures, is resistant to collision and friction, and has extremely low damage during long-term use. And a notch for leading out the load couple is reserved.

[0076] The furnace bottom 16 adopts a high squat 18 structure with a bottom plate 17, which can meet the use of a 1.5T load impact. A fixed material tray bottom plate 17 is provided above the furnace squat. A hot gas diversion hole is reserved in the middle of the high squat 18. The high pier design takes into account strength, speed, and versatility.

[0077] The opening and closing of the furnace door 2 are driven by a reduction gearbox through an electric motor to drive the furnace door 2 to move slowly up and down. The chain drive is stable and reliable; the transmission speed is about 6m / min. The up and down of the furnace door 2 are controlled by limit switches. The furnace door 2 is sealed with four sets of cylinder automatic locking devices, which improves the sealing performance of the furnace door 2 and thus reduces the heat loss of the equipment.

[0078] The steel structure of the furnace door 2: The steel skeleton is welded by steel plates and sections. The lower end of the furnace door 2 uses a heat-resistant plate and is assembled with bolts and sections. At the same time, the factors of expansion and deformation after heating are fully considered in the design, so that the furnace door 2 is resistant to high temperatures and is not easily deformed during long-term use.

[0079] The furnace door 2 frame is composed of columns and crossbeams. The furnace door 2 is a welded steel plate structure, and refractory fiber is installed inside the door frame as a refractory insulation body. The outer shell of the furnace door 2 is welded into a frame structure with profiled plates. The four-sided frame is made of high-temperature heat-resistant steel. The overall frame ensures no deformation under hot conditions, is strong and durable, and guarantees its long service life. The transmission of the furnace door 2 adopts the structural form of a cycloidal reducer + roller chain + counterweight. The cycloidal reducer of the driving mechanism of the furnace door 2 is installed on the crossbeam of the furnace door 2 to ensure stable and accurate lifting. The sealing method of the furnace door 2 adopts the cylinder sealing method. When the furnace door 2 descends to the position, the cylinder is used to stretch the lower section of the track towards the furnace body to automatically press the furnace door 2 tightly on the furnace mouth casting. The furnace door 2 adopts the cylinder pressing type sealing form. A high-temperature resistant fiber packing with soft-hard contact is used between the furnace mouth perimeter and the furnace door 2, which is wear-resistant, contains metal, stable and reliable. The furnace body (furnace wall and furnace top) is composed of profiled steel and steel plates welded together. The furnace wall steel plates are naturally divided according to the profiled steel frame, and are spliced in a separated manner and intermittently welded to the profiled steel frame to avoid overall deformation of the steel plates after being heated.

[0080] The heating elements need to ensure the temperature uniformity and heating capacity inside the furnace, and are mainly composed of heating elements, fixing parts and connecting parts. After analysis and calculation, Kanthal A1 type 20x1.5 resistance belts 4 are selected, and are controlled in two front and rear zones, with a maximum power of 90KW for each zone.

[0081] Temperature measurement uses thermocouples. The furnace is divided into 2 zones for temperature control. Each temperature zone uses one N-type double-core thermocouple (for temperature control and recording) and one single-core S-type thermocouple (for alarm). All thermocouples meet the requirements of industrial grade I measurement accuracy in the national standard. The temperature controller uses a Eurotherm 3504 intelligent temperature control instrument with a 485 communication interface to achieve PID regulation. The power control unit uses an Inge power regulator integrated three-phase power regulator to achieve. The electric heating elements are equipped with automatic air switches and fast fuses for secondary protection.

[0082] Other temperature recording, alarm devices, interlock protection functions, power control systems, etc. are usually set in this industry.

[0083] Finally, it should be noted that the above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A heating furnace, characterized in that, It includes a furnace wall, a furnace bottom, a furnace top and a furnace door. The furnace wall is located above the furnace bottom, the furnace top is located above the furnace wall, and the furnace door is located on the furnace wall. Along the direction from the inside to the outside of the furnace chamber, the furnace wall is composed of refractory bricks, first insulating cotton, insulating boards, first aerogel felts and a first profiled steel shell integrated together. Along the direction from the inside to the outside of the furnace chamber, the furnace top is composed of second insulating cotton, second aerogel felts and a second profiled steel shell integrated together. Along the direction from the inside to the outside of the furnace chamber, the furnace door is composed of third insulating cotton, third aerogel felts and a steel bracket integrated together. The furnace bottom is formed by laying high-aluminum heavy bricks, the first profiled steel shell is fixedly arranged on the ground, and multiple high pedestals are arranged on the furnace bottom.

2. The heating furnace according to claim 1, characterized in that, A gantry is arranged on one side of the first profiled steel shell where the furnace door is located. A first opening and closing power device is arranged on the gantry. The furnace door is connected to the first opening and closing power device through a chain assembly, and a locking device is arranged between the furnace door and the profiled steel shell.

3. A heating furnace according to claim 2, characterized in that, The furnace door includes an upper furnace door and a lower furnace door. The connection point of the upper furnace door and the lower furnace door is lower than the top of the high pedestal or at the same horizontal plane as the top of the high pedestal. The upper furnace door is connected to the first opening and closing power device through the chain assembly, and the lower furnace door is connected to a second opening and closing power device on the ground outside the furnace through a retraction assembly.

4. A heating furnace according to claim 1, characterized in that, Multiple heating units are distributed on the inner wall of the furnace wall and the inner wall of the furnace door. The heating unit includes a resistance band, conductive rods respectively connected to both ends of the resistance band, and hook nails for hanging and fixing the resistance band. The hook nails are T-shaped. The top of the hook nails is embedded in the furnace wall, the bottom of the hook nails horizontally extends, and the free end of the tail bends along the direction away from the resistance band.

5. A heating furnace according to claim 1, characterized in that, The thickness ratio of the refractory bricks, insulating cotton, insulating boards and aerogel felts is 23:22:1:

4.

6. A heating furnace according to claim 1, characterized in that, The thickness ratio of the insulating cotton and the aerogel felt is 23:

2.

7. A heating furnace according to claim 1, characterized in that, The thickness ratio of the insulating cotton and the aerogel felt is 23:

2.

8. A heating furnace according to claim 1, characterized in that, The high pedestal supports a bottom plate. The bottom plate is a grid structure, and the high pedestal is provided with protrusions for positioning the bottom plate.

9. A heating furnace according to claim 1, characterized in that, Three sides of the furnace wall include a rear wall and two side walls. The heating areas of the two side walls are divided into a front heating area and a rear heating area. The heating area of one rear wall and the rear heating areas of the two side walls form a post-heating cavity, and the heating area of the furnace door and the front heating areas of the two side walls form a pre-heating cavity.

10. A heating furnace according to claim 1, characterized in that, One end of the furnace top in contact with the furnace wall is provided with a first protrusion. A first depression is formed by connecting the furnace top main body and the first protrusion. The furnace wall is provided with a second protrusion. A second depression is formed by connecting the furnace wall main body and the second protrusion. The first protrusion cooperates with the second depression, and the second protrusion cooperates with the first depression; One end of the furnace wall in contact with the furnace door is provided with a third protruding portion. One end of the furnace bottom in contact with the furnace door is provided with a fourth protruding portion extending along the direction of the furnace top. Both side ends of the furnace door are provided with fourth recessed portions cooperating with the third protruding portion. The bottom end of the furnace door is provided with a fourth recessed portion cooperating with the fourth protruding portion. The heat insulation cotton and the heat insulation board at the top end of the furnace door extend outside the section steel housing.

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