A high efficiency heating furnace

Abstract

The present invention belongs to the technical field of heating furnace sealing, and particularly relates to a high-efficiency heating furnace, comprising a heating furnace body with a closed door, a propulsion device is arranged on the outer side of the closed door, a sealing plate connected to the propulsion device is arranged on the inner side of the closed door, the propulsion device can drive the sealing plate to move toward the heating furnace body, a fiber graphite gasket 1 is installed on the sealing plate, a fiber graphite gasket 2 is installed on the heating furnace, a ceramic closed gasket is sandwiched between the fiber graphite gasket 1 and the fiber graphite gasket 2, the fiber graphite gasket 1, the fiber graphite gasket 2 and the ceramic closed gasket are all arranged around the furnace mouth of the heating furnace body, the ceramic closed gasket is slidably connected to the heating furnace body, the present invention can effectively seal under high temperature, and is helpful to keep the contact pressure of the sealing surface stable, and at the same time, the fiber graphite gasket 1 and the fiber graphite gasket 2 are both flexible structures, and when they are fitted with the ceramic closed gasket, the force on their surface is more uniform, thereby avoiding damage to the sealing structure and achieving a higher fit.

Description

Technical Field

[0001] The invention belongs to the technical field of heating furnace sealing, and in particular relates to a high-efficiency heating furnace. Background Art

[0002] Industrial furnaces are usually large structures wrapped in a heavy metal shell, with a carefully designed high-temperature working area inside. They vary in size and shape, some are like huge boxes, and some are cylindrical. Inside the industrial furnace, extremely high temperatures can be generated by burning fuel, converting electricity or other energy supply methods. These high-temperature environments provide the necessary conditions for various industrial production processes, such as smelting, forging, heat treatment of metals, firing of ceramics, melting of glass, etc.

[0003] In some heat treatment furnaces, nitrogen or inert gas may be introduced to prevent metal oxidation at high temperatures. In some chemical vapor deposition furnaces, the reactive gases introduced, such as methane and hydrogen, are precisely controlled to deposit a specific film on the workpiece surface.

[0004] For example, an industrial furnace locking ring protection structure and an industrial furnace disclosed in the invention patent with the authorization patent announcement number CN112378253B are adopted, including: a base, a locking mechanism, and a protection mechanism. A furnace body is arranged at the top of the base, an electric push rod is arranged at one end of the outer wall of the base below the furnace body, a heating bin is arranged inside the furnace body, slide grooves are arranged on both sides of the inner wall of the heating bin, a movable plate is arranged inside the heating bin, and limited sliders are arranged on both sides of the movable plate. The present invention can protect the notch on the locking ring by arranging a locking ring, a notch, a locking card slot, a telescopic slot, a rotating slide groove, a protection block, a telescopic block, a compression block, and a telescopic spring. The notch can be filled by the protection block to prevent it from being exposed to the outside. The protection block can perform telescopic movement through the telescopic block, the compression block, and the telescopic spring, that is, while completing the protection of the notch, it will not affect the locking and separation operations between the furnace cover and the furnace body.

[0005] However, when it is necessary to introduce atmospheric gas to heat the product, it is generally necessary to ensure good sealing between the furnace cover and the furnace body. It is necessary to install a sealing device between the furnace cover and the furnace body to prevent leakage of atmospheric gas. At the same time, in processes such as heat treatment, the installation of a sealing device can improve the heating efficiency inside the industrial furnace and maintain a stable heating environment, avoid heat leakage and external influences, and thus improve product quality. The method generally adopted in the prior art is to set a seal between the hatch and the furnace body, and to achieve a sealing effect by closing the hatch and squeezing the seal. However, when the rotatably connected hatch is closed in the above-mentioned patent, it is easy to cause the seal to be unevenly pressurized. At the same time, due to the high temperature inside the industrial furnace, general seals are easily damaged by heat. Although some ceramic high-temperature resistant seals can maintain a good sealing effect at a higher temperature, the different thermal expansion coefficients of the mechanism for installing and fixing the seals can easily cause damage to such seals. Generally, a structure or device is required to prevent the seals from overheating, which results in a complex structure of the sealing system device. Therefore, a high-efficiency heating furnace with a simple structure, not easy to damage, and capable of improving the sealing effect of the heating furnace is needed. Summary of the invention

[0006] In view of the above problems, the present invention proposes a high-efficiency heating furnace, which effectively solves the problem in the prior art that the sealing device is easily subjected to uneven pressure, resulting in poor sealing effect, and the sealing structure is easily damaged by heat under high temperature conditions.

[0007] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is as follows: a high-efficiency heating furnace, comprising a heating furnace body with a closed door, a propulsion device is arranged on the outer side of the closed door, and a sealing plate connected to the propulsion device is arranged on the inner side of the closed door, and the propulsion device can drive the sealing plate to move toward the heating furnace body, a fiber graphite gasket 1 is installed on the sealing plate, a fiber graphite gasket 2 is installed on the heating furnace body, a ceramic closing gasket is sandwiched between the fiber graphite gasket 1 and the fiber graphite gasket 2, the fiber graphite gasket 1, the fiber graphite gasket 2 and the ceramic closing gasket are all arranged around the furnace mouth of the heating furnace body, and the ceramic closing gasket is slidably connected to the heating furnace body.

[0008] Furthermore, the fiber graphite gasket 1 and the fiber graphite gasket 2 both include an outer refractory fiber layer, an inner refractory fiber layer and a graphite layer, the inner refractory fiber layer and the graphite layer are arranged at intervals, the outer refractory fiber layer covers the inner refractory fiber layer and the graphite layer, and the fiber graphite gasket 1 is provided with a fixed countersunk hole on the side opposite to the fiber graphite gasket 2, and a connecting piece 1 fixedly connected to the sealing plate is penetrated in the fixed countersunk hole.

[0009] Furthermore, the inner refractory fiber layer and graphite layer in the outer refractory fiber layer include two arrangement modes: the inner refractory fiber layer and graphite layer at a portion where the connector is passed through are arranged longitudinally, and the inner refractory fiber layer and graphite layer at other portions are arranged transversely.

[0010] Furthermore, a plurality of sliding components are arranged around the outer side of the ceramic sealing gasket, and the sliding components include a second connector, a guide component, a third connector and an elastic component. The third connector is fixedly mounted on the heating furnace body, and a guide hole is opened on the third connector. The guide component is passed through the guide hole, and the two ends of the elastic component respectively abut against the third connector and the guide component. The outer side of the ceramic sealing gasket is fixedly connected to one end of the second connector, and the other end of the second connector is fixedly connected to the guide component.

[0011] Furthermore, a plurality of mounting holes are provided around the furnace mouth of the heating furnace body, the third connecting member is fixed in the mounting holes, the third connecting member is provided with a spring groove, the elastic member is a spring installed in the spring groove, the guide hole is provided at the bottom of the spring groove and is coaxial with the spring groove, one end of the guide member is slidably connected in the guide hole, the other end of the guide member extends out of the spring groove and is fixedly connected to the second connecting member, the guide member includes a guide rod and an abutment plate fixedly installed on the guide rod, the elastic member is sleeved on the guide rod and the two ends respectively abut the bottom of the spring groove and the abutment plate, and the notch of the spring groove is fixedly installed with a baffle.

[0012] Furthermore, the heating furnace body includes a frame layer located on the outer layer and a heat insulation layer located on the inner side of the frame layer, the third connecting member is fixedly connected to the frame layer, and the second fiber graphite gasket is connected to the heat insulation layer.

[0013] Furthermore, a connection groove is provided on the outer side of the ceramic sealing gasket, a pressure equalizing plate is provided in the connection groove, and the pressure equalizing plate is fixedly connected to the second connecting member.

[0014] Furthermore, a trough 1 is provided on the inner side of the closed door, a trough 2 is provided on the furnace mouth of the heating furnace body, the sealing plate and fiber graphite gasket 1 are arranged in the trough 1, the ceramic sealing gasket and fiber graphite gasket 2 are both arranged in the trough 2, the outer side of the sealing plate is slidably connected to the inner wall of the trough 1, a lifting device connected to the closed door is provided on the upper part of the heating furnace body, and the closed door is slidably connected to the heating furnace body.

[0015] Furthermore, the lifting device includes a bracket, on which is mounted a ball screw module perpendicular to the heating furnace body, the upper end of the closed door extends out of the heating furnace body and is fixedly connected to the slide of the ball screw module, and a lifting drive device is mounted on the heating furnace body, and the output end of the lifting drive device is connected to the screw of the ball screw module through gear meshing.

[0016] Furthermore, the propulsion device includes a propulsion drive device, a transmission shaft and a sleeve integrally connected to the left side of the sealing plate, the sealing plate is provided with a sleeve, the sleeve is slidably connected to the closed door in a horizontal direction, the propulsion drive device is fixedly installed on the outside of the closed door, one end of the transmission shaft is inserted into the sleeve and threadedly connected to the inner wall of the sleeve, and the propulsion drive device can drive the transmission shaft to rotate.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention uses a propulsion device to propel the sealing plate so that the fiber graphite gasket one and the fiber graphite gasket two clamp the ceramic sealing gasket. Both the fiber graphite gasket one and the fiber graphite gasket two are flexible structures. When they are fitted with the ceramic sealing gasket, the surface force is more uniform, which avoids damage to the ceramic sealing gasket and has a higher fit and better sealing. At the same time, the ceramic sealing gasket is slidably connected to the heating furnace body. The sliding connection helps to keep the contact pressure between the sealing surfaces relatively stable and can adapt to the thermal expansion of the sealing material itself during the heating process of the industrial furnace, so that a good sealing effect can be maintained under different working conditions.

[0019] At the same time, the fiber graphite gasket 1, the fiber graphite gasket 2 and the ceramic sealing gasket in the present invention can maintain a good sealing effect at a high temperature below 1200 degrees. At the same time, the connector 1 for fixing the fiber graphite gasket 1 and the fiber graphite gasket 2 is located inside the fiber graphite gasket 1 and the fiber graphite gasket 2. Because the refractory fiber layer and the graphite layer are arranged at intervals, the contact surface of the graphite itself and the surface of the graphite and the refractory fiber layer are not in perfect contact, which further improves the thermal resistance to achieve the effect of slowing down the transfer of heat and avoids the transfer of heat to the fixedly installed structural parts. Therefore, no additional protective structure is required and it can be applied to most industrial furnaces of heat treatment processes;

[0020] Furthermore, the present invention has a simple structure, and the sealing cooperation mode of the fiber graphite gasket 1, the fiber graphite gasket 2 and the ceramic sealing gasket is not only applicable to the closed door that is opened by rotation connection, but also applicable to the closed door that is opened by sliding, and has a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the cross-sectional structure of the present invention;

[0022] Figure 2 for Figure 1 A schematic diagram of the enlarged structure of the middle part A;

[0023] Figure 3 for Figure 1 A magnified schematic diagram of the structure of the middle B section;

[0024] Figure 4 for Figure 2 Enlarged schematic diagram of the structure of section C in the middle.

[0025] In the figure: 1, closed door; 2, heating furnace body; 21, frame layer; 22, heat insulation layer; 3, propulsion device; 31, propulsion drive device; 32, transmission shaft; 33, sleeve; 4, sealing plate; 41, sealing plate slider; 42, sealing plate slide; 5, fiber graphite gasket 1; 51, outer refractory fiber layer; 52, inner refractory fiber layer; 53, graphite layer; 6, fiber graphite gasket 2; 7, ceramic sealing gasket; 8, fixed countersunk hole; 9, connecting Connector one; 10, sliding assembly; 101, connector two; 102, guide member; 1021, guide rod; 1022, abutment plate; 103, connector three; 104, elastic member; 105, guide hole; 106, spring groove; 107, baffle; 11, mounting hole; 12, equalizing plate; 13, sink trough one; 14, lifting device; 141, bracket; 142, ball screw module; 143, lifting drive device; 15, sink trough two. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] like Figure 1-Figure 4 As shown, a high-efficiency heating furnace comprises a heating furnace body 2 with a closed door 1, a propulsion device 3 is arranged on the outer side of the closed door 1, a sealing plate 4 connected to the propulsion device 3 is arranged on the inner side of the closed door 1, the propulsion device 3 can drive the sealing plate 4 to move toward the heating furnace body 2, a fiber graphite gasket 1 5 is installed on the sealing plate 4, a fiber graphite gasket 2 6 is installed on the heating furnace body 2, a ceramic closed gasket 7 is sandwiched between the fiber graphite gasket 1 5 and the fiber graphite gasket 2 6, the fiber graphite gasket 1 5, the fiber graphite gasket 2 6 and the ceramic closed gasket 7 are all arranged around the furnace mouth of the heating furnace body 2, and the ceramic closed gasket 7 is slidably connected to the heating furnace body 2.

[0028] In the present embodiment, the fiber graphite gasket 1 5 and the fiber graphite gasket 2 6 both include an outer refractory fiber layer 51, an inner refractory fiber layer 52 and a graphite layer 53. The inner refractory fiber layer 52 and the graphite layer 53 are arranged at intervals. The outer refractory fiber layer 51 covers the inner refractory fiber layer 52 and the graphite layer 53. The fiber graphite gasket 1 5 and the fiber graphite gasket 2 6 are both provided with a fixed countersunk hole 8 on the side opposite to each other. The outer refractory fiber layer 51 and the inner refractory fiber layer 52 are woven by ceramic fibers. The ceramic fibers may be alumina ceramic fibers, aluminum silicate ceramic fibers or zirconium-containing ceramic fibers. A connector 9 fixedly connected to the sealing plate 4 is penetrated in the fixed countersunk hole 8. The connector 9 may be a fastener such as a screw. The sealing plate 4 may be made of a heat-resistant material, or a heat-insulating material may be sandwiched between the fiber graphite gasket 1 5 and the sealing plate 4 to prevent the heat in the heating furnace body 2 from being transferred to the closed door 1.

[0029] In this embodiment, the inner refractory fiber layer 52 and the graphite layer 53 in the outer refractory fiber layer 51 include two arrangement modes: the inner refractory fiber layer 52 and the graphite layer 53 at the position where the connecting piece 9 is passed through are arranged longitudinally, and the inner refractory fiber layer 52 and the graphite layer 53 at the remaining positions are arranged transversely.

[0030] In this embodiment, a plurality of sliding components 10 are arranged around the outer side of the ceramic sealing gasket 7, and the sliding component 10 includes a second connecting member 101, a guide member 102, a third connecting member 103 and an elastic member 104. The third connecting member 103 is fixedly mounted on the heating furnace body 2, and a guide hole 105 is opened on the third connecting member 103. The guide member 102 is passed through the guide hole 105. The two ends of the elastic member 104 respectively abut the third connecting member 103 and the guide member 102. The outer side of the ceramic sealing gasket 7 is fixedly connected to one end of the second connecting member 101, and the other end of the second connecting member 101 is fixedly connected to the guide member 102.

[0031] In this embodiment, a plurality of mounting holes 11 are provided around the furnace opening of the heating furnace body 2, and the connecting member 3 103 is arranged in the mounting hole 11. A plurality of screw holes connected to the mounting hole 11 are provided on the side of the heating furnace body 2, and fixing screws are passed through the screw holes. The fixing screws are threadedly connected to the connecting member 3 103 to fix the connecting member 3 103 in the mounting hole 11. The connecting member 3 103 is provided with a spring groove 106, and the elastic member 104 is a spring installed in the spring groove 106. The guide hole 105 is provided at the bottom of the spring groove 106 and is coaxial with the spring groove 106. One end of the guide member 102 is slidably connected to the guide hole 105, and a ventilating groove connected to the spring groove 106 is opened on the side of the guide hole 105. The other end of the guide member 102 extends out of the spring groove 106 and is fixedly connected to the connecting member 101. The guide member 102 includes a guide rod 1021 and an abutment plate 1022 integrally connected to the guide rod 1021. The elastic member 104 is sleeved on the guide rod 1021 and the two ends abut the bottom of the spring groove 106 and the abutment plate 1022 respectively. The notch of the spring groove 106 is fixed with a baffle 107 by screws.

[0032] In this embodiment, the heating furnace body 2 includes a frame layer 21 located on the outer layer and an insulation layer 22 located on the inner side of the frame layer 21. The mounting hole 11 is horizontally opened on the frame layer 21 at the furnace mouth position. The connecting piece 3 103 is installed in the mounting hole 11 and fixedly connected to the frame layer 21. The fiber graphite gasket 2 6 is directly fixedly connected to the insulation layer 22 by screws.

[0033] In this embodiment, a connecting groove is opened on the outer side of the ceramic sealing gasket 7, and the connecting groove is opened around the ceramic sealing gasket 7. A pressure equalizing plate 12 is arranged in the connecting groove. The pressure equalizing plate 12 is composed of multiple splicing plates. The shape of the splicing plates after assembly matches the shape of the connecting groove. The pressure equalizing plate 12 is fixed in the connecting groove by screws that pass through the ceramic sealing gasket 7 and the pressure equalizing plate 12 horizontally. Ceramic countersunk holes are opened on both sides of the ceramic sealing gasket 7 where the screws pass through. The screws and the matching nuts are both located in the ceramic countersunk holes. The pressure equalizing plate 12 is fixedly connected to the connecting piece 101 by welding.

[0034] In this embodiment, a sink groove 13 is provided on the inner side of the closed door 1, a sink groove 2 15 is provided on the furnace mouth of the heating furnace body 2, the sealing plate 4 and the fiber graphite gasket 15 are arranged in the sink groove 13, the ceramic sealing gasket 7 and the fiber graphite gasket 2 6 are located in the sink groove 15, the edge of the sealing plate 4 is provided with a sealing plate slider 41 protruding outward, the inner wall of the sink groove 13 is provided with a sealing plate slide groove 42, the sealing plate slider 41 is slidably connected in the sealing plate slide groove 42, so that the sealing plate 4 can slide horizontally in accordance with the inner wall of the sink groove 13, a lifting device 14 connected to the closed door 1 is provided on the upper part of the heating furnace body 2, vertical lifting slide grooves are provided on both sides of the furnace mouth of the heating furnace body 2, lifting sliders slidably connected in the lifting slide grooves are fixedly installed on both sides of the inner side of the closed door 1 by screws, and the closed door 1 and the heating furnace body 2 are slidably connected through the cooperation of the lifting sliders and the lifting slide grooves.

[0035] In this embodiment, the lifting device 14 includes a bracket 141, on which a ball screw module 142 perpendicular to the heating furnace body 2 is fixedly installed by screws. The upper end of the closed door 1 extends out of the upper side surface of the heating furnace body 2 and is fixedly connected to the slide of the ball screw module 142 by screws. The bottom key of the screw in the ball screw module 142 is connected with a gear one. A lifting drive device 143 is installed on the heating furnace body 2. The lifting drive device 143 can be an electric motor or a hydraulic motor. Gear two is installed at the output end of the lifting drive device 143. A matching gear three is arranged between gear two and gear one. Gear one and gear two are both engaged with matching gear three. Gear two is driven to rotate by the lifting drive device 143, thereby driving the screw of the ball screw module 142 to rotate. The lifting device 14 has two groups respectively arranged on both sides above the furnace mouth. The lifting drive device 143 in the lifting device 14 moves synchronously to avoid force deflection during the lifting of the closed door 1.

[0036] In this embodiment, the propulsion device 3 includes a propulsion drive device 31, a transmission shaft 32 and a sleeve 33 integrally connected to the left side of the sealing plate 4. A through hole is horizontally opened in the center of the closed door 1. The sleeve 33 is inserted into the through hole from the right end of the through hole. A sleeve slider is fixedly installed on the outer wall of the sleeve 33 by screws. A sleeve slide groove in a horizontal direction is opened in the through hole. The sleeve slide groove is slidably connected in the sleeve slide groove so that the sleeve 33 can slide in the horizontal direction. The propulsion drive device 31 can be an electric motor or a hydraulic motor. The propulsion drive device 3 1 is fixedly installed on the outer side of the closed door 1 by screws, a pulley is installed at the output end of the propulsion driving device 31, one end of the transmission shaft 32 is inserted into the sleeve 33, the inner wall of the sleeve 33 is provided with an internal thread, the outer wall of one end of the transmission shaft 32 inserted into the sleeve 33 is provided with an external thread matching the internal thread, the transmission shaft 32 is threadedly connected with the sleeve 33, a bearing is installed on the left side of the through hole by interference fit, the transmission shaft 32 is located in the inner hole of the bearing, and the other end of the transmission shaft 32 is connected to the pulley at the output end of the propulsion driving device 31 through a belt.

[0037] In this embodiment, closed doors 1 are provided at both ends of the heating furnace body 2 .

[0038] When the present invention is in operation, the screw of the ball screw module 142 is driven to rotate by the lifting drive device 143, thereby driving the slide on the ball screw module 142 to move upward. At this time, the slide of the ball screw module 142 drives the closed door 1 to slide upward along the slide grooves opened on both sides of the furnace mouth, and the products to be heated are sent into the interior of the heating furnace body 2. At this time, the lifting drive device 143 is driven in the opposite direction, thereby driving the closed door 1 to move downward, and the transmission shaft 32 is driven to rotate by the propulsion drive device 31. The transmission shaft 32 drives the sleeve 33 to move along the sleeve slide groove, thereby driving the fiber graphite gasket 15 on the sealing plate 4 to be close to the ceramic sealing gasket 7, and the refractory fibers arranged laterally in the fiber graphite gasket 15 are moved to the sealing plate 4. The fiber layer 52 bends and deforms when it is under pressure, and the bent and deformed inner refractory fiber layer 52 squeezes the graphite layer 53, causing the graphite layer 53 to also deform. The deformed graphite layer 53 provides support for the side of the fiber graphite gasket 5 that contacts the ceramic sealing gasket 7, so that the fiber graphite gasket 15 fits the ceramic sealing gasket 7 more closely. The fiber graphite gasket 15 continues to move and pushes the ceramic sealing gasket 7 so that the other side of the ceramic sealing gasket 7 fits the fiber graphite gasket 26. At this time, the guide member 102 connected to the ceramic sealing gasket 7 through the connector 2 101 compresses the spring. At the same time, the fiber graphite gasket 15 and the fiber graphite gasket 26 clamp the ceramic sealing gasket 7 to form a closed state inside the heating furnace body 2.

[0039] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-efficiency heating furnace, comprising a heating furnace body with a closed door, characterized in that: A propulsion device is provided on the outer side of the closed door, and a sealing plate connected to the propulsion device is provided on the inner side of the closed door. The propulsion device can drive the sealing plate to move toward the heating furnace body. A fiber graphite gasket 1 is installed on the sealing plate, and a fiber graphite gasket 2 is installed on the heating furnace body. A ceramic sealing gasket is sandwiched between the fiber graphite gasket 1 and the fiber graphite gasket 2. The fiber graphite gasket 1, the fiber graphite gasket 2 and the ceramic sealing gasket are all arranged around the furnace mouth of the heating furnace body. The ceramic sealing gasket is slidably connected to the heating furnace body. The fiber graphite gasket 1 and the fiber graphite gasket 2 both include an outer refractory fiber layer, an inner refractory fiber layer, and a ceramic sealing gasket. The fiber layer and the graphite layer are arranged at intervals, the outer refractory fiber layer covers the inner refractory fiber layer and the graphite layer, the fiber graphite gasket one is provided with a fixed countersunk hole on the side opposite to the fiber graphite gasket two, a connector one fixedly connected to the sealing plate is penetrated in the fixed countersunk hole, a plurality of sliding components are arranged around the outer side of the ceramic sealing gasket, the sliding components include a connector two, a guide component, a connector three and an elastic component, the connector three is fixedly installed on the heating furnace body, a guide hole is opened on the connector three, the guide component is penetrated in the guide hole, and the two ends of the elastic component respectively abut the connector three and the guide The outer side of the ceramic sealing gasket is fixedly connected to one end of the second connecting piece, and the other end of the second connecting piece is fixedly connected to the guide piece. A plurality of mounting holes are opened around the furnace mouth of the heating furnace body. The third connecting piece is fixed in the mounting hole. The third connecting piece is provided with a spring groove. The elastic piece is a spring installed in the spring groove. The guide hole is opened at the bottom of the spring groove and is coaxial with the spring groove. One end of the guide piece is slidably connected to the guide hole. The other end of the guide piece extends out of the spring groove and is fixedly connected to the second connecting piece. The guide piece includes a guide rod and an abutment plate fixedly installed on the guide rod. The elastic piece is sleeved on the guide rod and is divided into two ends. The bottom of the spring groove and the abutment plate are respectively abutted against the groove bottom and the abutment plate of the spring groove, the groove opening of the spring groove is fixedly installed with a baffle, a connecting groove is provided on the outer side of the ceramic closing gasket, a pressure equalizing plate is arranged in the connecting groove, the pressure equalizing plate is fixedly connected to the second connecting piece, a sinking groove is provided on the inner side of the closed door, a sinking groove is provided at the furnace mouth of the heating furnace body, the sealing plate and the fiber graphite gasket one are arranged in the sinking groove one, the ceramic closing gasket and the fiber graphite gasket two are both arranged in the sinking groove two, the outer side of the sealing plate is slidably connected to the inner wall of the sinking groove one, a lifting device connected to the closed door is provided on the upper part of the heating furnace body, and the closed door is slidably connected to the heating furnace body.

2. The high-efficiency heating furnace according to claim 1, characterized in that: The inner refractory fiber layer and graphite layer in the outer refractory fiber layer include two arrangement modes. The inner refractory fiber layer and graphite layer in the part where the connector is passed through are arranged longitudinally, and the inner refractory fiber layer and graphite layer in the other parts are arranged transversely.

3. The high-efficiency heating furnace according to claim 1, characterized in that: The heating furnace body comprises a frame layer located at the outer layer and a heat insulation layer located at the inner side of the frame layer, the third connecting member is fixedly connected to the frame layer, and the second fiber graphite gasket is connected to the heat insulation layer.

4. The high-efficiency heating furnace according to claim 1, characterized in that: The lifting device includes a bracket, on which a ball screw module is installed perpendicular to the heating furnace body, the upper end of the closed door extends out of the heating furnace body and is fixedly connected to the slide of the ball screw module, and a lifting drive device is installed on the heating furnace body, and the output end of the lifting drive device is connected to the screw of the ball screw module through gear meshing.

5. The high-efficiency heating furnace according to claim 1, characterized in that: The propulsion device includes a propulsion drive device, a transmission shaft and a sleeve integrally connected to the left side of the sealing plate. The sleeve is slidably connected to the closed door in a horizontal direction. The propulsion drive device is fixedly installed on the outside of the closed door. One end of the transmission shaft is inserted into the sleeve and threadedly connected to the inner wall of the sleeve. The propulsion drive device can drive the transmission shaft to rotate.

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