A high specific gravity controllable atmosphere fuel-saving tunnel furnace

Abstract

The present invention relates to a high specific gravity controlled atmosphere fuel-saving tunnel furnace, which comprises a furnace body with an inlet passage and an outlet passage formed at the head and the tail, and a conveying device passing through the interior of the furnace body. The furnace body comprises an inlet section, a high-temperature muffle furnace liner, a cooling section and an outlet section which are connected in sequence. The inlet passage is formed at one end of the inlet section away from the high-temperature muffle furnace liner, and the height of the inlet section is higher than the top of the high-temperature muffle furnace liner. The outlet passage is formed at one end of the outlet section away from the high-temperature muffle furnace liner, and the height of the outlet section is higher than the top of the high-temperature muffle furnace liner. The present invention has the effect of saving fuel.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel furnaces, and in particular to a high-specific-gravity controllable atmosphere fuel-saving tunnel furnace. Background Art

[0002] One of the key development directions of heat treatment production technology is controllable atmosphere heat treatment, which realizes non-oxidizing heat treatment by using a controllable atmosphere. In small-variety, large-batch production, especially for bright quenching, annealing, carburizing quenching, carbonitriding quenching, and gas carbonitriding of carbon steel and general alloy structural steel parts, the controllable atmosphere is still the main means.

[0003] When performing controllable atmosphere heat treatment, a tunnel furnace is often used. The conveying device in the tunnel furnace conveys the workpieces and heats and cools the workpieces. During the heating process of the workpieces, a controllable atmosphere is needed for protection to avoid oxidation of the workpiece surface. The commonly used protective gas is hydrogen. Hydrogen is filled in the tunnel to empty the oxygen in the furnace. For an ordinary tunnel furnace to make hydrogen stably filled in the furnace, the running track of the workpieces in the tunnel furnace is in a bridge structure. Then, the inlet end and the outlet end of the tunnel furnace are lower than the bottom of the high-temperature muffle furnace liner, so that the lighter-specific-gravity hydrogen can float in the high-positioned tunnel furnace, thereby discharging the heavier-specific-gravity oxygen from the inlet and outlet of the tunnel furnace.

[0004] The patent with the Chinese patent publication number CN204803374U discloses a stainless steel bright annealing furnace, which includes a conveying bracket, a driving device, a front conveying wheel, a rear conveying wheel, a thermometer, a steel belt, an annealing furnace, an annealing furnace inlet, an annealing furnace outlet, a primary cooling jacket, and a secondary cooling jacket. The annealing furnace conveys materials in and out through the steel belt, replacing manual feeding and increasing work efficiency. A thermometer is provided at the annealing furnace outlet to monitor the outlet temperature. At the same time, a cooling system is provided at the annealing furnace outlet to accelerate the cooling speed of the sintered materials. A circular roller rack is provided inside the annealing furnace, which can rotate for heating, making the sintering temperature more uniform and improving the sintering quality. A cleaning furnace cover is provided above the annealing furnace to facilitate regular cleaning of the heating tubes inside the furnace.

[0005] In the above technical solution, the workpieces are inclined upwardly conveyed into the annealing furnace by the conveying device, and after heating and cooling, the workpieces are inclined downwardly conveyed by the conveying device again. The tunnel furnace with such a structure is suitable for a protective gas with a gas density smaller than that of oxygen. However, for some workpieces, a protective gas with a density larger than that of oxygen needs to be used. At this time, the furnace body with such a structure cannot be applied to the use of a high-specific-gravity controllable atmosphere. Summary of the Invention

[0006] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide a high-specific-gravity controllable atmosphere fuel-saving tunnel furnace, which achieves the effect of fuel saving.

[0007] The above-mentioned invention object of the present invention is achieved by the following technical solutions: A high specific gravity controllable atmosphere fuel-saving tunnel furnace, including a furnace body with an inlet channel and an outlet channel formed at the head and tail, and a conveying device passing through the inside of the furnace body. The furnace body includes an inlet section, a high-temperature muffle furnace lining, a cooling section, and an outlet section connected in sequence. The inlet channel is formed at one end of the inlet section away from the high-temperature muffle furnace lining, and the height of the inlet section is higher than the top of the high-temperature muffle furnace lining. The outlet channel is formed at one end of the outlet section away from the high-temperature muffle furnace lining, and the height of the outlet section is higher than the top of the high-temperature muffle furnace lining.

[0008] By adopting the above technical solutions, when using a gas with a high specific gravity as the protective gas, since the heights of the inlet section and the outlet section are higher than the top of the high-temperature furnace lining, the high-specific-gravity protective gas can fill the entire tunnel, playing a good protective effect during the heating process of the workpiece. At the same time, because there is a certain height difference between the inlets and outlets of the inlet section and the outlet section and the high-temperature muffle furnace lining, it is difficult for the internal protective gas to overflow from the inlets and outlets, which can improve the stability of the protective gas inside the tunnel furnace, enhance the fuel-saving effect, reduce the overflow of the protective gas during the working process, and thus there is no need to continuously supplement the protective gas into the tunnel furnace.

[0009] In a preferred example of the present invention, it can be further configured that: both the inlet channel and the outlet channel are vertical, and a heating channel that is horizontal and perpendicular to the inlet channel is formed inside the high-temperature muffle furnace lining.

[0010] By adopting the above technical solutions, making the inlet channel, the outlet channel, and the heating channel all perpendicular, the protective gas filled in the heating channel becomes difficult to overflow from the inlets and outlets, achieving a better fuel-saving effect.

[0011] In a preferred example of the present invention, it can be further configured that: the conveying device includes a conveyor belt that circulates and drives, and a driving mechanism for driving the conveyor belt to move. The conveyor belt includes a process section that sequentially passes through the inlet section, the high-temperature muffle furnace lining, the cooling section, and the outlet section, and a return section placed on the outer wall of the furnace body. Conveying openings for passing the conveyor belt are provided on the side walls of the inlet section and the outlet section away from the high-temperature muffle furnace lining, and a dynamic seal is formed between the conveying openings and the conveyor belt.

[0012] By adopting the above technical solutions, the workpiece is directly placed on the surface of the conveyor belt from the inlet channel and taken out from the outlet channel. At this time, the conveyor belt only responsible for horizontally conveying the workpiece, which can reduce the openings in the inlet section and the outlet section for passing the conveyor belt, reduce the overflow of the protective gas, achieving a further fuel-saving effect. Setting the return section of the conveyor belt outside the furnace body can also minimize the openings in the inlet section and the outlet section for passing the conveyor belt.

[0013] In a preferred embodiment, the present invention can be further configured as follows: the conveying device includes a push plate hermetically and slidably connected to a side wall of the inlet section away from the high-temperature muffle furnace chamber in the horizontal direction, and a power cylinder placed outside the furnace body and connected to the push plate.

[0014] By adopting the above technical solution, the workpieces are arranged in sequence on the inner wall of the furnace body. Driven by the power cylinder, the push plate is intermittently pushed to move, so that the workpieces can be pushed forward, enabling the workpieces to gradually pass through the high-temperature muffle furnace chamber and the cooling section. During the sliding process, the push plate remains vertical with the side wall of the inlet section, which can reduce the overflow of the protective gas inside the furnace body and achieve a better gas-saving effect.

[0015] In a preferred embodiment, the present invention can be further configured as follows: workpiece lifting mechanisms are provided at the tops of both the inlet section and the outlet section. The workpiece lifting mechanism includes a vertical support connected to the top of the inlet section or the outlet section and extending vertically, a moving frame slidably connected to the vertical support in the vertical direction, and a carrier connected to the moving frame for carrying the workpiece.

[0016] By adopting the above technical solution, the workpieces can be placed from the inlet channel to the internal conveying device, enabling the conveying device to convey the workpieces. After heating and cooling, the workpiece lifting mechanism is used to take out the workpieces from the outlet channel. The process section of the conveying device penetrates the side walls of the inlet section and the outlet section, and the workpieces and the conveying device have different inlets, which can reduce the opening areas of the inlet section and the outlet section, reduce the overflow of the internal gas, and achieve a better gas-saving effect.

[0017] In a preferred embodiment, the present invention can be further configured as follows: horizontal supports are installed at the tops of both the inlet section or the outlet section and are horizontal. The vertical support is slidably connected to the horizontal support in the horizontal direction.

[0018] By adopting the above technical solution, the vertical support can move with the workpiece on the horizontal support, which facilitates transferring the workpiece to the surface of the conveyor belt without the need for other operations, and is convenient for loading and unloading the workpiece.

[0019] In a preferred embodiment, the present invention can be further configured as follows: the conveying device includes a conveying member that circulates and drives the conveying member to move. The conveying member includes an inclined downward section placed in the inlet section and inclined downward toward the high-temperature muffle furnace chamber, a horizontal conveying section connected to the inclined downward section and passing through the high-temperature muffle furnace chamber and the cooling section, an inclined upward section connected to the horizontal conveying section and inclined upward on the side away from the high-temperature muffle furnace chamber, and a return section connected between the opposite ends of the inclined upward section and the inclined downward section and placed outside the furnace body. The heights of the opposite ends of the inclined downward section and the inclined upward section are both higher than the top of the high-temperature muffle furnace chamber.

[0020] By adopting the above technical solution, the workpiece can be conveyed to the high-temperature muffle furnace through the inclined downward section for heating, and the processed workpiece can be conveyed to the outside by relying on the inclined upward section. The highest points of the inclined upward section and the inclined downward section are higher than the top of the high-temperature muffle furnace, so that the protective gas inside can fill the entire furnace body and it is difficult to overflow outward from the inlet and outlet, achieving the effect of saving gas.

[0021] In a preferred example of the present invention, it can be further configured that: limiting mechanisms are provided at the corners of the inner wall of the furnace body where the inclined downward section and the horizontal conveying section meet and where the inclined upward section and the horizontal conveying section meet. The limiting mechanism includes rollers rotatably connected to the inner wall of the furnace body and perpendicular to the conveying direction of the conveying member. There are at least two tangent rollers, and all of them are placed above the conveying member. The roller closer to the high-temperature muffle furnace abuts against the surface of the conveying member, and there is a gap between the roller farther from the high-temperature muffle furnace and the surface of the conveying member.

[0022] By adopting the above technical solution, the workpiece can be separated from the surface of the conveying member at the corner. The workpiece moves through the corner driven by the rollers and then moves back to the surface of the conveying member. At the same time, the rollers are used to limit the conveying member at the corner, avoiding the middle part of the conveying member being pulled up, maintaining the stable conveying of the entire conveying member, and also keeping the inclined downward section and the inclined upward section as a whole inclined, so that the position of the high-temperature muffle furnace is at a low level.

[0023] In a preferred example of the present invention, it can be further configured that: the inlet section and the outlet section are both detachably connected with heightening sections.

[0024] By adopting the above technical solution, the heightening section can be adjusted according to the actual internal air pressure requirements, so that a positive pressure is formed inside the furnace body, making it difficult for external gases to enter the furnace body, thereby providing a better protection effect for the workpiece.

[0025] In a preferred example of the present invention, it can be further configured that: the heightening section includes a chassis detachably connected to the outlet section or the inlet section, a telescopic tube connected to the chassis and capable of telescoping, and a top plate connected to the end of the telescopic tube away from the chassis. The inlet section and the outlet section are connected with a telescopic cylinder for pushing the top plate to move up and down.

[0026] By adopting the above technical solution, the telescopic cylinder can drive the top plate to move up and down, so that the height of the inlet section or the outlet section can be changed through the telescopic tube, and then a positive pressure environment is formed inside the furnace body, making it difficult for external gases to enter the furnace body.

[0027] In summary, the present invention includes at least one of the following beneficial technical effects of a high specific gravity controllable atmosphere gas-saving tunnel furnace:

[0028] By relying on the fact that the heights of the inlet section and the outlet section are higher than the top of the high-temperature muffle furnace liner, the protective gas can fully fill the entire interior of the furnace body, enabling the protective gas to provide a better protection effect on the workpiece. At the same time, it can also reduce the overflow of the protective gas, achieving a better gas-saving effect;

[0029] By using the setting where the conveying device and the workpiece have non-identical inlet and outlet openings, the connecting area between the interior and the exterior of the furnace body can be reduced, thereby reducing the overflow amount of the internal protective gas and achieving a better gas-saving effect;

[0030] By relying on the extended sections of the inlet section and the outlet section, the positive pressure inside the furnace body can be increased, preventing external gas from entering the interior of the furnace body, enabling a better protection effect on the workpiece, and effectively avoiding the overflow of the protective gas. Brief Description of the Drawings

[0031] Figure 1 It is a partial structural schematic diagram of the first embodiment.

[0032] Figure 2 It is a partial structural schematic diagram of the first embodiment mainly for embodying the workpiece lifting mechanism.

[0033] Figure 3 It is a partial structural schematic diagram of the second embodiment.

[0034] Figure 4 It is a partial structural schematic diagram of the third embodiment.

[0035] Figure 5 It is a partial structural schematic diagram of the fourth embodiment.

[0036] Reference Numerals: 1, furnace body; 11, inlet section; 12, high-temperature muffle furnace liner; 13, cooling section; 14, outlet section; 2, inlet channel; 3, outlet channel; 4, conveying device; 41, conveyor belt; 411, forward section; 412, return section; 42, drive mechanism; 421, drive wheel; 422, drive motor; 5, conveying opening; 43, push plate; 44, power cylinder; 45, conveying member; 451, inclined downward section; 452, horizontal conveying section; 453, inclined upward section; 454, horizontal return section; 46, drive assembly; 6, workpiece lifting mechanism; 61, vertical support; 611, vertical lead screw; 612, vertical motor; 62, moving frame; 63, bearing member; 7, horizontal support; 71, horizontal lead screw; 8, limiting mechanism; 81, roller; 9, extended section; 91, chassis, 92, telescopic tube; 93, top plate; 10, telescopic cylinder; 15, heating channel; 16, flange; 17, sealing rubber plate; 18, transmission wheel; 19, steering wheel. Detailed Embodiments

[0037] The following further elaborates on the present invention in conjunction with the accompanying drawings.

[0038] Example 1:

[0039] Referring to Figure 1 , a high-specific-gravity controlled-atmosphere fuel-saving tunnel furnace disclosed by the present invention includes a furnace body 1. The furnace body 1 includes an inlet section 11, a high-temperature muffle furnace chamber 12, a cooling section 13, and an outlet section 14 that are sequentially connected through a flange 16. Inside the furnace body 1, a conveying device 4 for horizontally conveying workpieces is provided. An inlet passage 2 for placing workpieces is formed at the inlet section 11 at the head end of the furnace body 1, and an outlet passage 3 for taking out workpieces is formed at the outlet section 14 at the tail end of the furnace body 1. The inlet passage 2 and the outlet passage 3 are vertical and perpendicular to the conveying direction of the workpieces. A heating passage 15 that is horizontal and perpendicular to the inlet passage 2 is formed inside the high-temperature muffle furnace chamber 12, and the heights of the inlet section 11 and the outlet section 14 are higher than the top of the high-temperature muffle furnace chamber 12. During the working process, high-specific-gravity protective gas can fill the entire inside of the furnace body 1, playing a good protective effect on the workpieces and achieving the effect of fuel saving at the same time.

[0040] The inlet section 11 is L-shaped and the inlet section 11 and the outlet section 14 are symmetrical about the center line in the length direction of the entire furnace body 1. Flanges 16 are integrally formed at one end of the inlet section 11 and the outlet section 14 facing each other, and flanges 16 are integrally formed at both ends of the high-temperature muffle furnace chamber 12 and at both ends of the cooling section 13. The inlet section 11, the high-temperature muffle furnace chamber 12, the cooling section 13, and the outlet section 14 are sequentially sealed and fixedly connected through the flanges 16. The inner wall of the cooling section 13 can be provided with cooling water pipes to exchange heat and cool the workpieces inside.

[0041] The conveying device 4 includes a circulating conveyor belt 41. The conveyor belt 41 includes a process section 411 that sequentially passes through the inlet section 11, the high-temperature muffle furnace chamber 12, the cooling section 13, and the outlet section 14. Both ends of the process section 411 penetrate through the side walls of the inlet section 11 and the outlet section 14 facing away from each other. Conveying openings 5 for passing through the process section 411 are formed in the side walls of the inlet section 11 and the outlet section 14 facing away from each other. The size of the conveying opening 5 is similar to the size of the process section 411, and a sealing rubber plate 17 that abuts against the surface of the process section 411 is installed at the conveying opening 5, so that the process section 411 and the conveying opening 5 can be dynamically sealed. The bottom surface of the process section 411 abuts against the bottom of the inner wall of the furnace body 1. Both ends of the process section 411 are respectively wound around a driving wheel 18. A return section 412 is integrally formed between both ends of the process section 411 located outside the furnace body 1. The return section 412 is parallel to the process section 411 and is located outside the furnace body 1. And a driving mechanism 42 for driving the entire conveyor belt 41 to circulate and rotate is provided outside the furnace body 1. The driving mechanism 42 includes two driving wheels 421 that abut against the return section 412 and a driving motor 422 that drives one of the driving wheels 421 to rotate. The conveyor belt 41 is tensioned and wrapped around the outer walls of the two driving wheels 421.

[0042] Combined with Figure 1 and Figure 2 As shown, in order to facilitate the loading and unloading of workpieces, workpiece lifting mechanisms 6 are provided at the tops of the inlet section 11 and the outlet section 14. The workpiece lifting mechanism 6 includes a horizontal bracket 7 connected to the top of the inlet section 11 or the outlet section 14 and being horizontal. The direction of the horizontal bracket 7 is parallel to the width direction of the conveyor belt 41. A vertically arranged vertical bracket 61 is slidably connected to the horizontal bracket 7 along its length direction. A horizontal lead screw 71 parallel to the horizontal bracket 7 is rotatably connected to the horizontal bracket 7. The horizontal lead screw 71 passes through and is threadedly connected to the vertical bracket 61. And a horizontal motor (not marked in the figure) for driving the horizontal lead screw 71 to rotate is fixedly installed on the horizontal bracket 7. The vertical bracket 61 extends into the inlet passage 2 and is close to the surface of the conveyor belt 41. A moving frame 62 is slidably connected to the vertical bracket 61. A carrier 63 for carrying the workpiece and having a substantially L-shaped cross section is fixedly installed on the moving frame 62. One end of the carrier 63 away from its vertical side wall is inclined downward at a certain angle. A vertical lead screw 611 arranged vertically is rotatably connected to the vertical bracket 61. The vertical lead screw 611 passes through and is threadedly connected to the moving frame 62. A vertical motor 612 for driving the vertical lead screw 611 to rotate is fixedly installed on the vertical bracket 61. The workpiece is transported above the inlet section 11 to the surface of the carrier 63. When the workpiece is transported to the surface of the carrier 63, the workpiece is not completely placed on the surface of the carrier 63, but the friction force between the workpiece and the surface of the carrier 63 will not cause the workpiece to slide off automatically. Then the moving frame 62 moves downward to transport the workpiece to be close to the surface of the conveyor belt 41. When the workpiece contacts the surface of the conveyor belt 41, the entire vertical bracket 61 is moved to transfer the workpiece to the surface of the conveyor belt 41, thereby completing the feeding of the workpiece. The workpiece lifting mechanism 6 above the outlet section 14 has the same structure, thereby completing the unloading of the workpiece.

[0043] During the implementation of this embodiment, before starting work, a protective gas is filled into the furnace body 1, and the remaining gases inside the furnace body 1 are emptied, so that the high-specific-gravity protective gas can fill the entire furnace body 1, which can have a good heating effect on the internal workpieces and also make it difficult for the protective gas during operation to overflow from the inside of the furnace body 1. The workpiece is transported downward to the surface of the conveyor belt 41 by the workpiece lifting mechanism 6. The conveyor belt 41 is driven to circulate by the driving mechanism 42, thereby driving the workpiece to pass through the high-temperature muffle furnace liner 12 and the cooling section 13 in sequence, and then the workpiece is sent out from the surface of the conveyor belt 41 by the workpiece lifting mechanism 6.

[0044] Embodiment 2:

[0045] A high-specific-gravity controllable atmosphere fuel-saving tunnel furnace, which is different from Embodiment 1 in that, referring to Figure 3As shown in the figure, the conveying device 4 includes a push plate 43 that is hermetically and slidably connected to the opening of the inlet section 11 along the workpiece conveying direction. The push plate 43 is integrally rectangular and made of rubber material. A power cylinder 44 is fixedly installed on the outer wall of the inlet section 11. The piston rod of the power cylinder 44 is connected to the push plate 43, and the power cylinder 44 can be a hydraulic cylinder or a pneumatic cylinder. During the actual working process, the workpiece lifting mechanism 6 (with the same structure as the workpiece lifting mechanism 6 marked in Figure 2 delivers the workpiece to the bottom wall inside the furnace body 1. The power cylinder 44 pushes the push plate 43 to move the workpiece towards the outlet section 14. After the push plate 43 of the power cylinder 44 retracts, the next workpiece is placed between the previous workpiece and the push plate 43, and then the power cylinder 44 synchronously pushes multiple workpieces forward. The stroke of the piston rod of the power cylinder 44 is the same as the dimension of each workpiece along the workpiece conveying direction. Therefore, each push of the power cylinder 44 advances the arranged workpieces by the position of one workpiece.

[0046] Embodiment 3:

[0047] A high-specific-gravity controlled-atmosphere fuel-saving tunnel furnace, which is different from Embodiment 1 in that, referring to Figure 4 the figure, the conveying device 4 includes a circulating conveyor 45. The conveyor 45 can be an iron conveyor chain plate. The conveyor 45 includes an inclined downward section 451 placed in the inlet section 11 and inclined downward towards the high-temperature muffle furnace liner 12. A horizontal conveyor section 452 passing through the high-temperature muffle furnace liner 12 and the cooling section 13 is integrally formed at the bottom of the inclined downward section 451. An inclined upward section 453 inclined upward towards the side away from the high-temperature muffle furnace liner 12 is integrally formed on the side of the horizontal conveyor section 452 away from the inclined downward section 451. A horizontal return section 454 is connected between the inclined upward section 453 and the opposite end of the inclined downward section 451 and placed outside the furnace body 1. The heights of the sides of the inclined downward section 451 and the inclined upward section 453 away from each other are both higher than the top of the high-temperature muffle furnace liner 12.

[0048] In order to enable the conveying member 45 to realize circular transmission, a steering wheel 19 is arranged between the horizontal return section 454 and the inclined downward section 451 and between the horizontal return section 454 and the inclined upward section 453. A limiting mechanism 8 is arranged on the inner wall of the furnace body 1 at the corner of the inclined downward section 451 and the horizontal conveying section 452 and at the corner of the inclined upward section 453 and the horizontal conveying section 452. The limiting mechanism 8 includes a roller 81 rotatably connected to the inner wall of the furnace body 1 and parallel to the width direction of the conveying member 45. The roller 81 has three tangentially arranged rollers, one of which is located in the middle and is parallel to the conveying member 45. The middle roller 81 is driven to rotate under the circular transmission of the conveying member 45, and the rollers 81 on both sides rotate in the same direction, so that the workpiece can be separated from the surface of the conveying member 45 when passing the corner. The limiting mechanisms 8 on both sides can also limit the conveying member 45, so that the conveying member 45 can maintain the stability of the inclined downward section 451 and the inclined upward section 453, so that the horizontal transmission section 452 of the conveying member 45 will not be pulled up, thereby achieving better stability.

[0049] During operation, the workpiece is placed on the surface of the inclined downward section 451 and transported to the interior of the high-temperature muffle furnace 12. After passing through the interior of the high-temperature muffle furnace 12, the workpiece is transported outward by the inclined upward section 453. In order to ensure stable transportation of the inclined downward section 451 and the inclined upward section 453, the slopes of the inclined downward section 451 and the inclined upward section 453 are relatively gentle, so that the workpiece will not slide on the surface of the inclined downward section 451 and the inclined upward section 453 during transportation.

[0050] Embodiment 4:

[0051] A high specific gravity controlled atmosphere temperature-saving tunnel furnace, referring to Figure 5 As shown, the difference from the first embodiment is that a heightened section 9 is detachably connected to the top of the inlet section 11 and the outlet section 14, and the heightened section 9 includes a chassis 91 detachably connected to the outlet section 14 or the inlet section 11, and the chassis 91 is a flange. A retractable telescopic tube 92 is connected to the chassis 91, and the telescopic tube 92 can be an organ pipe. A top plate 93 is sealedly connected to the upper end of the telescopic tube 92, and a telescopic cylinder 10 connected to the top plate 93 is connected to both the inlet section 11 and the outlet section 14. The telescopic cylinder 10 can be an oil cylinder. The telescopic cylinder 10 can be used to change the distance between the top plate 93 and the chassis 91, thereby changing the pressure inside the furnace body 1.

[0052] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, all equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A high specific gravity controllable atmosphere fuel-saving tunnel furnace, comprising a furnace body (1) with an inlet passage (2) and an outlet passage (3) formed at the head and tail, and a conveying device (4) passing through the inside of the furnace body (1). The furnace body (1) includes an inlet section (11), a high-temperature muffle furnace liner (12), a cooling section (13) and an outlet section (14) connected in sequence, and is characterized in that: The inlet channel (2) is formed at one end of the inlet section (11) away from the high-temperature muffle furnace chamber (12), and the height of the inlet section (11) is higher than the top of the high-temperature muffle furnace chamber (12). The outlet channel (3) is formed at one end of the outlet section (14) away from the high-temperature muffle furnace chamber (12), and the height of the outlet section (14) is higher than the top of the high-temperature muffle furnace chamber (12). Both the inlet channel (2) and the outlet channel (3) are vertical. A heating channel (15) that is horizontal and perpendicular to the inlet channel (2) is formed in the high-temperature muffle furnace chamber (12). The conveying device (4) includes a conveyor belt (41) that circulates and drives, and a driving mechanism (42) that drives the conveyor belt (41) to move. The conveyor belt (41) includes a process section (411) that sequentially passes through the inlet section (11), the high-temperature muffle furnace chamber (12), the cooling section (13), and the outlet section (14), and a return section (412) disposed on the outer wall of the furnace body (1). Conveying openings (5) for passing the conveyor belt (41) are formed on the side walls of the inlet section (11) and the outlet section (14) away from the high-temperature muffle furnace chamber (12). A sealing rubber plate (17) that abuts against the surface of the process section (411) is installed at the conveying opening (5), so that a dynamic seal is formed between the conveying opening (5) and the process section (411) of the conveyor belt (41). The bottom surface of the process section (411) abuts against the bottom of the inner wall of the furnace body (1). Workpiece lifting mechanisms (6) are provided at the tops of both the inlet section (11) and the outlet section (14). The workpiece lifting mechanism (6) includes a vertical support (61) connected to the top of the inlet section (11) or the outlet section (14) and extending vertically, a moving frame (62) slidably connected to the vertical support (61) in the vertical direction, and a carrier (63) connected to the moving frame (62) for carrying workpieces. Horizontal supports (7) that are horizontal are installed at the tops of both the inlet section (11) and the outlet section (14). The vertical support (61) is slidably connected to the horizontal support (7) in the horizontal direction.

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