U-shaped tunnel furnace conveying system and U-shaped tunnel furnace

Abstract

The application relates to the technical field of heating equipment, in particular to a U-shaped tunnel furnace conveying system and a U-shaped tunnel furnace. The U-shaped tunnel furnace conveying system comprises a rack arranged in the U-shaped tunnel furnace and a plurality of conveying rollers mounted on the rack; the plurality of conveying rollers are arranged at intervals along the extension direction of the U-shaped tunnel furnace; the end portions of the conveying rollers extend to the outside through the side walls of the U-shaped tunnel furnace; the penetrating end of each conveying roller is provided with a first chain wheel and a second chain wheel; the first chain wheel adjacent to the first side is connected through a first chain; and the second chain wheel adjacent to the second side is connected through a second chain. The application can realize quick replacement of the conveying rollers, is favorable for realizing non-stop maintenance and avoiding frequent start and stop of the equipment.

Description

Technical Field

[0001] This application relates to the field of heating equipment technology, and more specifically, to a U-shaped tunnel furnace conveying system and a U-shaped tunnel furnace. Background Technology

[0002] In industrial production, high-temperature U-shaped tunnel furnaces are widely used in various continuous thermal processes such as ceramic sintering, heat treatment of electronic components, metal annealing, and glass processing. To achieve continuous material transport within the furnace cavity, existing high-temperature U-shaped tunnel furnaces are typically equipped with a conveying system that runs through the furnace body, with common forms including mesh belt, roller conveyor, or pusher plate structures.

[0003] Traditional roller conveyor U-shaped tunnel furnaces typically employ an integrated drive or centralized transmission method for their conveyor rollers, meaning multiple conveyor rollers are driven by a single main drive shaft and chain. While this structure ensures synchronization during normal operation, a malfunction in any conveyor roller or its transmission component (such as bearing damage, roller surface deformation, or chain breakage) often necessitates shutdown for repairs, and may even require disassembling the entire furnace structure to replace or repair the faulty component.

[0004] Because high-temperature U-shaped tunnel furnaces are typically integrated into highly automated continuous production lines, any unplanned shutdown will disrupt the entire production line, severely impacting production efficiency and potentially causing product quality fluctuations or even scrap due to sudden changes in furnace temperature, resulting in significant economic losses. Furthermore, frequent start-ups and shutdowns in high-temperature environments accelerate the aging of furnace refractory materials and heating elements, further shortening the equipment's lifespan. Utility Model Content

[0005] The purpose of this application is to provide a U-shaped tunnel furnace conveying system and a U-shaped tunnel furnace, which enables quick replacement of conveyor rollers, facilitates non-stop maintenance, and avoids frequent equipment start-ups and shutdowns.

[0006] The embodiments of this application are implemented as follows: In a first aspect, this application provides a U-shaped tunnel furnace conveying system, including a frame disposed inside the U-shaped tunnel furnace and a plurality of conveying rollers mounted on the frame; the plurality of conveying rollers are arranged at intervals along the extension direction of the U-shaped tunnel furnace; the ends of the conveying rollers extend through the side wall of the U-shaped tunnel furnace to the outside, and a first sprocket and a second sprocket are installed at the through end of each conveying roller; the first sprocket is linked to the first sprocket adjacent to the first side on the first side by a first chain; the second sprocket is linked to the second sprocket adjacent to the second side on the second side by a second chain.

[0007] As an optional implementation, both ends of the conveying roller penetrate the sidewall of the U-shaped tunnel furnace, with the first sprocket located at one end of the conveying roller and the second sprocket located at the other end of the conveying roller.

[0008] As an optional implementation, one end of the conveying roller penetrates the side wall of the U-shaped tunnel furnace, and the first sprocket and the second sprocket are mounted on the same end of the conveying roller.

[0009] Secondly, this application provides a U-shaped tunnel furnace, including a U-shaped tunnel furnace body and the aforementioned U-shaped tunnel furnace conveying system; the U-shaped tunnel furnace conveying system is used to convey workpiece trays within the U-shaped tunnel furnace body.

[0010] As an optional implementation, a circulating fan is also included; the circulating fan includes a drive motor and a turbofan; a window is opened on the top or side of the U-shaped tunnel furnace body; the turbofan is inserted into the U-shaped tunnel furnace body through the window, and the drive motor is located outside the U-shaped tunnel furnace body.

[0011] As an optional implementation, a heat-insulating and sealing structure is sandwiched between the contact surface of the circulating fan and the U-shaped tunnel furnace body.

[0012] As an optional implementation, holes are made in the top or side of the U-shaped tunnel furnace body; heating rods are inserted into the holes.

[0013] As an optional implementation, the portion of the heating rod located outside the U-shaped tunnel furnace body is equipped with two perforated cover plates and a protective cover; an insulation structure is sandwiched between the two perforated cover plates, and the perforated cover plates abut against the outer wall of the U-shaped tunnel furnace body; the protective cover surrounds the outside of the perforated cover plates.

[0014] As an optional implementation, the U-shaped tunnel furnace body has at least two parallel and spaced sections, with a transition conveying section between the two sections. The transition conveying section and the two sections of the U-shaped tunnel furnace body are arranged in a U-shape. The transition conveying section includes a transition section furnace body and translation and lifting devices disposed at both ends of the transition section furnace body.

[0015] As an optional implementation, the translation and lifting device includes a translation mechanism, a lifting mechanism, a first drive module, and a second drive module; the translation mechanism and the lifting mechanism are both located inside the transition section furnace body, and the first drive module and the second drive module are both located outside the transition section furnace body; a first drive shaft and a second drive shaft are inserted on the transition section furnace body, the first drive module drives the lifting mechanism to move through the first drive shaft, and the second drive module drives the translation mechanism to move through the second drive shaft.

[0016] As an optional implementation, maintenance doors are provided at both ends of the transition section furnace body.

[0017] The beneficial effects of this application include: The U-shaped tunnel furnace conveying system and U-shaped tunnel furnace provided in this application adopt a double-sided segmented transmission structure in which each side sprocket is connected to the corresponding sprocket of the adjacent roller only through an independent short chain. This achieves high reliability and maintainability of the conveying system. When any intermediate conveying roller fails, only a short chain connecting each end needs to be disconnected to quickly pull the roller out of the furnace and replace it without stopping the machine or disassembling the furnace body. This effectively avoids unplanned line stoppages, ensures the stability of the high-temperature continuous production line, the consistency of product quality, and the service life of the equipment, and significantly improves production efficiency and ease of operation and maintenance. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is one of the schematic diagrams of the U-shaped tunnel furnace conveying system according to an embodiment of this application; Figure 2 This is the second schematic diagram of the U-shaped tunnel furnace conveying system according to an embodiment of this application; Figure 3 This is the third schematic diagram of the U-shaped tunnel furnace conveying system according to an embodiment of this application; Figure 4 This is the fourth schematic diagram of the U-shaped tunnel furnace conveying system according to an embodiment of this application; Figure 5 This is the fifth schematic diagram of the U-shaped tunnel furnace conveying system according to an embodiment of this application; Figure 6 This is the sixth schematic diagram of the U-shaped tunnel furnace conveying system in the embodiments of this application.

[0020] Icons: 100-Conveyor roller; 101-First sprocket; 102-Second sprocket; 103-First chain; 104-Second chain; 105-U-shaped tunnel furnace body; 106-U-shaped tunnel furnace conveying system; 107-Circulating fan; 108-Drive motor; 109-Turbine fan; 110-Heating rod; 111-Protective cover; 112-Hole cover plate; 113-Insulation structure; 114-Transition conveyor section; 115-Translation and lifting device; 116-Translation mechanism; 117-Lifting mechanism; 118-First drive module; 119-Second drive module; 120-Transition section furnace body; 121-First drive shaft; 122-Second drive shaft. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0023] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0024] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0025] Traditional roller conveyor U-shaped tunnel furnaces typically employ an integrated drive or centralized transmission method for their conveyor rollers, meaning multiple conveyor rollers are driven by a single main drive shaft and chain. While this structure ensures synchronization during normal operation, a malfunction in any conveyor roller or its transmission component (such as bearing damage, roller surface deformation, or chain breakage) often necessitates shutdown for repairs, and may even require disassembling the entire furnace structure to replace or repair the faulty component.

[0026] Because high-temperature U-shaped tunnel furnaces are typically integrated into highly automated continuous production lines, any unplanned shutdown will disrupt the entire production line, severely impacting production efficiency and potentially causing product quality fluctuations or even scrap due to sudden changes in furnace temperature, resulting in significant economic losses. Furthermore, frequent start-ups and shutdowns in high-temperature environments accelerate the aging of furnace refractory materials and heating elements, further shortening the equipment's lifespan.

[0027] To solve the above-mentioned technical problems, this application provides a U-shaped tunnel furnace conveying system 106 and a U-shaped tunnel furnace.

[0028] Reference Figure 1 As shown, the U-shaped tunnel furnace conveying system of this application embodiment includes a frame disposed inside the U-shaped tunnel furnace and a plurality of conveying rollers 100 mounted on the frame; the plurality of conveying rollers 100 are arranged at intervals along the extension direction of the U-shaped tunnel furnace; the ends of the conveying rollers 100 extend through the side wall of the U-shaped tunnel furnace to the outside, and a first sprocket 101 and a second sprocket 102 are installed at the through end of each conveying roller 100; the first sprocket 101 is linked with the first sprocket 101 adjacent to the first side through a first chain 103; the second sprocket 102 is linked with the second sprocket 102 adjacent to the second side through a second chain 104.

[0029] It should be noted that in the embodiments of this application, multiple conveying rollers 100 are arranged at intervals along the extension direction of the furnace body. Each conveying roller 100 extends out of the furnace at both ends and is equipped with a first sprocket 101 and a second sprocket 102. The first sprocket 101 is connected to the first sprocket 101 of the adjacent conveying roller 100 only through the first chain 103, and the second sprocket 102 is connected to the second sprocket 102 of the adjacent conveying roller 100 only through the second chain 104, forming a short-pitch chain drive structure that is independent on both sides or one side.

[0030] It should be noted that, if a power input roller is installed at one end of the conveying system as needed, although the connection is cut off from the conveyor roller 100 that needs to be replaced, the line can be stopped by quick replacement.

[0031] Preferably, power input rollers are provided at both ends of the conveying system. The power input rollers are connected to the adjacent conveying rollers 100 through the first chain 103 or the second chain 104, so as to provide driving force to both ends of the U-shaped tunnel furnace conveying system 106.

[0032] This embodiment of the application enables that when any conveyor roller 100 fails, it can be directly pulled out from outside the U-shaped tunnel furnace and replaced simply by disconnecting a section of the first chain 103 and a section of the second chain 104 connected to its through end. The remaining conveyor rollers 100 can still operate normally because they are continuously driven by power from both ends and the transmission path is not completely interrupted. This achieves true non-stop rapid maintenance and significantly improves the continuity of the production line and the availability of equipment.

[0033] It should be noted that the conveying rollers 100 are installed at both ends of the conveying system (i.e., the inlet end and the outlet end), and their roller shafts are directly connected to external drive devices (such as motors and reducers), serving as the active rollers of the entire conveying system. When the drive device is started, power is transmitted through the rotation of the power input roller to the first sprocket 101 and the second sprocket 102 connected to it, which in turn drives the first chain 103 and the second chain 104 meshed with it to move. Since the chains adopt a "one-to-one connection between adjacent rollers" method (i.e., each chain segment only connects to two sprockets on the same side of adjacent rollers), the power is transmitted step by step from both ends to the middle, driving all the conveying rollers 100 to rotate synchronously.

[0034] This application embodiment adopts a double-sided segmented transmission structure in which each side sprocket is connected to the corresponding sprocket of the adjacent roller only through an independent short chain segment. This achieves high reliability and maintainability of the conveying system. When any intermediate conveying roller 100 fails, it is only necessary to disconnect a short chain segment connected to each end of the roller to quickly pull it out from outside the furnace and replace the roller without stopping the machine or disassembling the furnace body. This effectively avoids unplanned line stoppages, ensures the stability of the high-temperature continuous production line, the consistency of product quality, and the service life of the equipment, and significantly improves production efficiency and ease of operation and maintenance.

[0035] It should be noted that not only can a quick replacement be achieved without stopping the machine when any conveyor roller 100 fails, but also when the first chain 103 or the second chain 104 is partially damaged, only a single section of the first chain 103 or the second chain 104 between the two adjacent rollers on the corresponding side needs to be disassembled for quick replacement, without stopping the machine or disassembling the entire machine structure. Combined with the power input at both ends and the single-sided or double-sided layout design, while ensuring the stable conveying of workpiece pallets, the system significantly improves maintainability, operational continuity and thermal sealing performance, effectively reducing the risk of unplanned downtime, energy consumption and maintenance costs.

[0036] As an optional implementation, both ends of the conveying roller 100 penetrate the side wall of the U-shaped tunnel furnace, with the first sprocket 101 disposed at one end of the conveying roller 100 and the second sprocket 102 disposed at the other end of the conveying roller 100.

[0037] This application employs an innovative design of double-sided segmented chain drive. Each conveyor roller 100 has both ends penetrating the sidewall of the U-shaped tunnel furnace, with a first sprocket 101 at one end and a second sprocket 102 at the other. These sprockets are connected one-to-one with the corresponding sprockets of adjacent conveyor rollers 100 via independent first chains 103 and second chains 104. Simultaneously, power input rollers are positioned at both ends of the conveying system to synchronously input driving force from both sides. This structure allows power to be transmitted from both ends to the middle along the length of the furnace, forming a redundant drive path. When a conveyor roller 100 is damaged, only the first chains 103 and second chains 104 connecting its two ends need to be disconnected for complete removal and replacement from outside the furnace. The remaining conveyor rollers 100 can continue to operate normally because the chains on both sides are not completely interrupted and they are still driven by power from both ends. This solution not only achieves truly non-stop rapid maintenance but also effectively improves transmission uniformity, system reliability, and the stability of high-temperature continuous production.

[0038] Reference Figure 1 As shown, in one optional implementation, one end of the conveyor roller 100 penetrates the side wall of the U-shaped tunnel furnace, and the first sprocket 101 and the second sprocket 102 are installed at the same end of the conveyor roller 100.

[0039] This application also provides an optional implementation with a single-sided layout: the conveyor roller 100 penetrates the side wall of the U-shaped tunnel furnace at only one end, and the first sprocket 101 and the second sprocket 102 are both centrally installed at this penetrating end, respectively connected one-to-one with the corresponding sprockets on the same side of the adjacent conveyor roller 100 through the first chain 103 and the second chain 104; the power input roller is also located at both ends of the conveying system and on the same side. This design concentrates all transmission components on one side of the U-shaped tunnel furnace, avoiding the need to open holes for roller shafts to pass through in the furnace wall on the other side, significantly reducing the heat loss path of the furnace body, and improving the overall heat preservation performance and energy utilization efficiency; at the same time, it retains the core advantages of segmented chain drive and dual-end drive, and further optimizes the sealing performance and thermal stability of the high-temperature furnace body while enabling rapid replacement of faulty rollers and supporting maintenance without stopping the machine.

[0040] Reference Figure 2 As shown, this application provides a U-shaped tunnel furnace, including a U-shaped tunnel furnace body 105 and the aforementioned U-shaped tunnel furnace conveying system 106; the U-shaped tunnel furnace conveying system 106 is used to convey workpiece trays within the U-shaped tunnel furnace body 105.

[0041] The U-shaped tunnel furnace provided in this application integrates the aforementioned double-sided or single-sided segmented chain drive conveying system, enabling stable and synchronous conveying of workpiece pallets in high-temperature continuous operation environments. Its modular transmission structure, combined with a two-end power input design, allows for rapid replacement of any conveyor roller 100 without stopping the machine in case of failure, effectively preventing production line interruptions and ensuring production continuity and product quality stability. Simultaneously, the single-sided layout reduces furnace body openings, improving insulation performance and energy efficiency. Overall, this U-shaped tunnel furnace combines high reliability, ease of maintenance, and excellent thermal performance, significantly reducing operating costs and extending equipment lifespan.

[0042] Reference Figure 3 As shown, as an optional implementation, it also includes a circulating fan 107; the circulating fan 107 includes a drive motor 108 and a turbo fan 109; a window is opened on the top or side of the U-shaped tunnel furnace body 105; the turbo fan 109 is inserted into the U-shaped tunnel furnace body 105 through the window, and the drive motor 108 is located outside the U-shaped tunnel furnace body 105.

[0043] This embodiment further integrates a quickly replaceable circulating fan 107 into the U-shaped tunnel furnace. The turbofan 109 extends into the furnace through a window opened at the top or side of the furnace body, while the drive motor 108 is located outside the furnace body. The two are connected by a drive shaft passing through the window. This structure isolates the high-temperature area from the motor and modularizes the entire fan. When the circulating fan 107 fails, there is no need to stop the furnace or disassemble the main furnace structure; the connection can be disconnected from the outside, and the entire fan can be removed and replaced using hoisting equipment, significantly reducing maintenance time. This design not only improves the reliability and ease of maintenance of the hot air circulation system but also ensures the stability and energy efficiency of the production line under continuous high-temperature operation, effectively avoiding uneven furnace temperature or production line interruptions caused by fan failure.

[0044] As an optional implementation, a heat-insulating and sealing structure is sandwiched between the contact surface of the circulating fan 107 and the U-shaped tunnel furnace body 105.

[0045] It should be noted that the circulating fan 107 is installed by inserting it through a window on the top or side of the furnace body. A heat-insulating and sealing structure is provided between the circulating fan 107 and the contact surface between the circulating fan 107 and the U-shaped tunnel furnace body 105. This structure ensures that the circulating fan 107 can be quickly disassembled and assembled, while effectively preventing the leakage of high-temperature gas inside the furnace and the infiltration of cold air from the outside, significantly improving the thermal sealing and heat preservation performance of the furnace body. Even when replacing the fan without stopping the line, it can minimize heat loss and furnace temperature fluctuations, ensuring the stability and energy efficiency of the heat treatment process, and taking into account both the convenience of equipment maintenance and the sealing reliability under high-temperature operating conditions.

[0046] Reference Figure 3As shown, as an optional implementation, the U-shaped tunnel furnace body 105 has holes on its top or side; heating rods 110 are inserted into the holes.

[0047] Among them, reference Figure 4 As shown, the heating rod 110 located outside the U-shaped tunnel furnace body 105 is equipped with two hole cover plates 112 and a protective cover 111; a heat insulation structure 113 is sandwiched between the two hole cover plates 112, and the hole cover plates 112 abut against the outer wall of the U-shaped tunnel furnace body 105; the protective cover 111 surrounds the outside of the hole cover plates 112.

[0048] In this embodiment, a dedicated hole is provided on the top or side of the U-shaped tunnel furnace body 105 for inserting heating rods 110, allowing the heating elements to be installed in the furnace body in a modular manner. When a heating rod 110 is damaged or its performance degrades, there is no need to stop the machine or disassemble the furnace structure; the faulty heating rod 110 can be quickly replaced simply by pulling it out from the outside and inserting a new one. This design decouples the heating system from the furnace body, significantly improving maintenance efficiency and equipment availability. Simultaneously, combined with reasonable hole sealing measures, it enables uninterrupted maintenance of the heating elements while ensuring thermal performance, effectively avoiding uneven furnace temperature, product quality fluctuations, or production line interruptions caused by localized heating failures, thus improving the stability, flexibility, and energy efficiency of the U-shaped tunnel furnace operation.

[0049] Reference Figure 2 As shown, as an optional implementation, there are at least two parallel U-shaped tunnel furnace bodies 105, and a transition conveying section 114 is provided between the two U-shaped tunnel furnace bodies 105. The transition conveying section 114 and the two U-shaped tunnel furnace bodies 105 are arranged in a U-shape. The transition conveying section 114 includes a transition section furnace body 120 and translation and lifting devices 115 provided at both ends of the transition section furnace body 120.

[0050] It should be noted that the U-shaped tunnel furnace structure includes at least two parallel and spaced U-shaped tunnel furnace bodies 105, connected by a transition conveyor section 114, forming an overall U-shape. This transition conveyor section 114 includes a transition section furnace body 120 and translational lifting devices 115 at both ends, used to automatically transfer and connect workpiece pallets between different furnace sections. This U-shaped layout effectively shortens the straight-line space occupied by the production line, optimizes workshop space utilization, and is particularly suitable for space-constrained production environments. Simultaneously, the translational lifting device 115 ensures smooth and precise reversal and transport of workpieces during turning transitions, maintaining the continuity of the heat treatment process. The overall structure balances efficient logistics, compact layout, and process stability, enhancing the flexibility and integration of the automated production line.

[0051] Reference Figure 5 , Figure 6As shown, in one optional implementation, the translation and lifting device 115 includes a translation mechanism 116, a lifting mechanism 117, a first drive module 118, and a second drive module 119. The translation mechanism 116 and the lifting mechanism 117 are both located inside the transition section furnace body 120, while the first drive module 118 and the second drive module 119 are both located outside the transition section furnace body 120. A first drive shaft 121 and a second drive shaft 122 are inserted into the transition section furnace body 120. The first drive module 118 drives the lifting mechanism 117 to move through the first drive shaft 121, and the second drive module 119 drives the translation mechanism 116 to move through the second drive shaft 122.

[0052] In this embodiment, the translation and lifting device 115 of the transition conveying section 114 adopts a modular drive design: its translation mechanism 116 and lifting mechanism 117 are integrated inside the transition section furnace body 120, while the first drive module 118 (such as a telescopic cylinder) and the second drive module 119 (such as a motor with a reducer) are arranged outside the furnace body and connected to the internal lifting mechanism 117 and translation mechanism 116 through the first drive shaft 121 and the second drive shaft 122 penetrating the furnace wall, respectively. This structure places the key power components outside the high-temperature area, which not only effectively avoids the damage of heat radiation to the drive components, but also allows the drive module to be quickly disassembled and replaced directly from outside the furnace in case of failure, without stopping the line or entering the furnace for operation. At the same time, the U-shaped layout combined with this reliable and easy-to-maintain transfer mechanism optimizes the utilization of production line space and ensures the smooth, continuous, and automated connection and transportation of workpieces between multiple U-shaped tunnel furnaces, significantly improving the overall line operating efficiency and maintenance convenience.

[0053] As an optional implementation, maintenance doors are provided at both ends of the transition section furnace body 120.

[0054] It should be noted that both ends of the transition section furnace body 120 are equipped with inspection doors, which facilitates maintenance personnel to quickly enter the transition area without interrupting production or in the event of a partial shutdown, to inspect, maintain or replace the internal translation mechanism 116, lifting mechanism 117 or transmission components. This design, together with the externally arranged drive modules (such as telescopic cylinders and motors) and the through-type drive shaft, further improves the accessibility and maintenance efficiency of the equipment.

[0055] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A U-shaped tunnel furnace conveying system, characterized in that, The furnace includes a frame disposed inside the U-shaped tunnel furnace and a plurality of conveying rollers (100) mounted on the frame; the plurality of conveying rollers (100) are arranged at intervals along the extension direction of the U-shaped tunnel furnace; the ends of the conveying rollers (100) extend through the side wall of the U-shaped tunnel furnace to the outside, and a first sprocket (101) and a second sprocket (102) are installed at the through end of each conveying roller (100); the first sprocket (101) is linked with the first sprocket (101) adjacent to the first side through a first chain (103); the second sprocket (102) is linked with the second sprocket (102) adjacent to the second side through a second chain (104).

2. The U-shaped tunnel furnace conveying system according to claim 1, characterized in that, Both ends of the conveying roller (100) penetrate the side wall of the U-shaped tunnel furnace. The first sprocket (101) is located at one end of the conveying roller (100), and the second sprocket (102) is located at the other end of the conveying roller (100).

3. The U-shaped tunnel furnace conveying system according to claim 1, characterized in that, One end of the conveying roller (100) penetrates the side wall of the U-shaped tunnel furnace, and the first sprocket (101) and the second sprocket (102) are installed at the same end of the conveying roller (100).

4. A U-shaped tunnel furnace, characterized in that, It includes a U-shaped tunnel furnace body (105) and a U-shaped tunnel furnace conveying system (106) as described in any one of claims 1-3; the U-shaped tunnel furnace conveying system (106) is used to convey workpiece pallets within the U-shaped tunnel furnace body (105).

5. The U-shaped tunnel furnace according to claim 4, characterized in that, It also includes a circulating fan (107); the circulating fan (107) includes a drive motor (108) and a turbo fan (109); the top or side of the U-shaped tunnel furnace body (105) has a window; the turbo fan (109) is inserted into the U-shaped tunnel furnace body (105) through the window, and the drive motor (108) is located outside the U-shaped tunnel furnace body (105).

6. The U-shaped tunnel furnace according to claim 5, characterized in that, A heat-insulating and sealing structure is sandwiched between the contact surface of the circulating fan (107) and the U-shaped tunnel furnace body (105).

7. The U-shaped tunnel furnace according to claim 4, characterized in that, The top or side of the U-shaped tunnel furnace body (105) has holes; heating rods (110) are inserted into the holes.

8. The U-shaped tunnel furnace according to claim 7, characterized in that, The heating rod (110) located outside the U-shaped tunnel furnace body (105) is equipped with two hole cover plates (112) and a protective cover (111); a heat insulation structure (113) is sandwiched between the two hole cover plates (112), and the hole cover plates (112) abut against the outer wall of the U-shaped tunnel furnace body (105); the protective cover (111) surrounds the outside of the hole cover plates (112).

9. The U-shaped tunnel furnace according to claim 4, characterized in that, The U-shaped tunnel furnace body (105) has at least two parallel intervals, and a transition conveying section (114) is provided between the two U-shaped tunnel furnace bodies (105). The transition conveying section (114) and the two U-shaped tunnel furnace bodies (105) are arranged in a U-shape. The transition conveying section (114) includes a transition section furnace body (120) and translation and lifting devices (115) provided at both ends of the transition section furnace body (120).

10. The U-shaped tunnel furnace according to claim 9, characterized in that, The translation and lifting device (115) includes a translation mechanism (116), a lifting mechanism (117), a first drive module (118), and a second drive module (119). The translation mechanism (116) and the lifting mechanism (117) are both located inside the transition section furnace body (120), and the first drive module (118) and the second drive module (119) are both located outside the transition section furnace body (120). A first drive shaft (121) and a second drive shaft (122) are inserted on the transition section furnace body (120). The first drive module (118) drives the lifting mechanism (117) to move through the first drive shaft (121), and the second drive module (119) drives the translation mechanism (116) to move through the second drive shaft (122). Maintenance doors are opened at both ends of the transition section furnace body (120).

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