A translational circulation transmission structure for a baking tray rack in a multi-layer tunnel oven

Abstract

This invention relates to the field of video processing equipment, specifically disclosing a translational and circulating transmission structure for a baking tray rack in a multi-layer tunnel oven. The structure includes a support frame, a power unit, a directional track, two chains, sprockets, a directional carriage, and a baking tray support. The sprockets are arranged in pairs along the horizontal and vertical directions of the support frame. Each sprocket has a guide wheel on its left side, connected to the sprocket drive. The directional track cooperates with the guide wheel to ensure the directional carriage maintains a horizontal posture throughout the chain rotation. By adding guide wheels, a directional track, and a cooperating directional carriage, this invention ensures the directional carriage maintains a stable horizontal posture during chain-driven movement. This, in turn, keeps the baking tray support, fixedly connected to the directional carriage, in a stable horizontal position within the tunnel oven, forming a multi-layered circulating motion. This fully utilizes the heating space within the tunnel oven, improves baking efficiency, and avoids the risk of baking tray shaking and tipping.

Description

Technical Field

[0001] This invention relates to the field of food processing equipment, and more particularly to a translational circulation transmission structure for a baking tray rack in a multi-layer tunnel oven. Background Technology

[0002] With the increasing prevalence of central kitchens, the demand for large-scale food preparation is growing. Tunnel ovens, used for large-scale baking processes, are typically small in size. They transport baking trays through a single-layer conveyor belt, baking the food during this process. However, this conveying and baking method is inefficient; the amount of food that can be baked at one time is limited by the size of the tunnel oven and the length of the conveyor belt, thus affecting food processing efficiency and consuming a significant amount of energy. Increasing the amount of food to be baked requires extending the conveyor belt and the tunnel oven to process more food simultaneously, resulting in larger space requirements and even higher energy consumption. Therefore, improving the baking efficiency of tunnel ovens without increasing their size is a technical problem that urgently needs to be solved by those skilled in the art.

[0003] See Chinese Invention Patent (Application Publication No.: CN111011407A), which describes a multi-layer baking tray driven by a chain and chain wheel that rotates in a baking tunnel oven, thereby increasing the utilization rate of the internal space of the baking tunnel oven. The baking tray rack is connected to the chain for rotation through a bearing in the upper middle part, and the baking tray rack is kept vertically suspended by gravity.

[0004] However, during actual practical testing, it was found that the rotating baking tray rack of this solution often wobbled when changing direction as it followed the chain movement due to the high temperature and humidity environment, as well as the impact of crumbs and oil residue from the baked food. The increased friction at the pivot point caused the baking tray to wobble. Occasionally, the increased friction of the drive rollers caused the bracket to tilt and fail to return to its original position by gravity. This prevented the guide wheels from properly engaging the guide rail, causing the entire tray rack to tip over, scattering the baked food into the baking tunnel oven. In some cases, the conveyor belt would even jam, resulting in equipment damage. Summary of the Invention

[0005] To overcome the problems of swaying, tipping over, or jamming that occur when the aforementioned brackets rely solely on gravity to maintain vertical suspension during turning movements, this invention provides a translational and circulating transmission structure for the baking tray rack of a multi-layer tunnel oven.

[0006] The technical solution adopted in this invention is: a translational circulation transmission structure for a baking tray rack in a multi-layer tunnel oven, comprising a support, a power component, a directional track, two chains, n pairs of sprockets, m pairs of directional trolleys, and m baking tray supports; wherein, n is an even number greater than or equal to 4, and m is a positive integer;

[0007] n pairs of sprockets are symmetrically arranged on the front and rear sides of the bracket, and the sprockets are arranged in pairs along the horizontal and vertical directions of the bracket, respectively, and the two chains are respectively wound around the sprockets on the front and rear sides of the bracket;

[0008] The power assembly is used to drive the two chains to rotate synchronously.

[0009] m directional trolleys are symmetrically arranged between two chains, and each directional trolley is rotatably connected to one of the chains. m baking trays are horizontally arranged in the front-back direction, and each baking tray is fixedly connected to a pair of directional trolleys at both ends.

[0010] Each of the sprockets has a guide wheel connected to the sprocket drive at a distance L on its left side, and all the guide wheels are rotatably connected to the bracket; wherein, the distance L is greater than the radius of the sprocket;

[0011] The directional track is fixedly installed inside the bracket and is used to cooperate with the guide wheel to ensure that the directional trolley maintains a horizontal posture during the rotation of the chain.

[0012] Preferably, each of the directional trolleys includes a side plate, and a connecting shaft, a horizontal roller, a vertical roller, and an oblique roller that are rotatably connected to the side plate; the connecting shaft is perpendicularly connected to the side of the chain, the horizontal roller is located at a distance L to the left of the connecting shaft, the vertical roller is located directly below the connecting shaft, and the oblique roller is located to the left of the vertical roller at a distance less than L;

[0013] The outer side of the guide wheel is provided with several second arc-shaped grooves that cooperate with the horizontal roller;

[0014] The directional track is used in conjunction with the horizontal roller, vertical roller and diagonal roller to ensure that the directional trolley maintains a horizontal posture throughout the rotation of the chain.

[0015] Preferably, the directional track includes a vertical guide rail, a horizontal guide rail, a transition guide rail, and a steering guide rail;

[0016] The vertical guide rail is used to cooperate with the vertical roller so that the directional trolley maintains a horizontal posture when moving in the vertical direction;

[0017] The transverse guide rail is used to cooperate with the transverse roller to keep the directional trolley in a horizontal position when it moves in the horizontal direction; the transverse guide rail is provided with a first opening to avoid the connecting shaft, the vertical roller and the inclined roller;

[0018] The transition guide rail is used to cooperate with the inclined roller to keep the directional trolley in a horizontal position when passing through the chain turning point;

[0019] The steering guide rail is used to cooperate with the horizontal roller to keep the directional trolley in a horizontal orientation when turning horizontally and moving vertically.

[0020] Preferably, a fixed roller is sleeved on the connecting shaft, and the fixed roller is used to cooperate and abut against the vertical guide rail and the horizontal guide rail.

[0021] Preferably, the directional track further includes a movable pressure plate and a movable shaft, wherein the movable pressure plate includes a limiting curved rail and a pressure roller curved rail;

[0022] One end of the movable shaft is rotatably connected to the movable pressure plate, and the other end of the movable shaft is fixedly connected to the bracket;

[0023] The limiting curved rail and the pressure roller curved rail are respectively located on both sides of the movable shaft, with the limiting curved rail located above the sprocket and the pressure roller curved rail located above the guide wheel;

[0024] The pressure roller curved rail has an arc-shaped protrusion below one end near the movable shaft; the other end of the pressure roller curved rail has a mounting plate, which is used to prevent the pressure roller curved rail from getting close to the guide wheel by connecting the bracket. The protrusion is used to lift the pressure roller curved rail when the fixed roller passes by, so that the fixed roller enters between the limiting curved rail and the sprocket. When the fixed roller abuts against the limiting curved rail, the pressure roller curved rail and the protrusion cooperate to abut against the transverse roller, so that the transverse roller fits into the second arc-shaped groove.

[0025] Preferably, the distance between the horizontal roller and the vehicle side panel is greater than the distance between the oblique roller and the vehicle side panel, and the distance between the oblique roller and the vehicle side panel is greater than the distance between the vertical roller and the vehicle side panel.

[0026] Preferably, the guide wheel and the sprocket rotate synchronously in the same direction. The outer side of the guide wheel is provided with a plurality of first arc-shaped grooves that cooperate with the bushings of the chain. The radius of the base circle where the first arc-shaped groove is located is the same as the radius of the base circle where the second arc-shaped groove is located.

[0027] Preferably, a first gear is fixedly provided on one side of the sprocket, and a second gear identical to the first gear is fixedly provided on one side of the guide wheel. A transmission gear is provided between the first gear and the second gear, and both ends of the transmission gear are respectively engaged with the first gear and the second gear.

[0028] Preferably, the power assembly includes a drive shaft, a geared motor, and two third gears. The two third gears are fixedly disposed at both ends of the drive shaft. The geared motor is used to drive the drive shaft to rotate. The two third gears respectively cooperate with one of a pair of first gears on the front and rear sides of the bracket.

[0029] The beneficial effects of this invention are:

[0030] By adding guide wheels, directional tracks, and directional carriages that work in conjunction with them, the directional carriages maintain a stable horizontal posture throughout the chain-driven motion. In the high-temperature and high-humidity oven environment, even if the increased friction at the connection point with the chain makes it difficult for the directional carriages to maintain a horizontal position by gravity, the guide wheels and directional tracks provide support and pressure to keep the directional carriages horizontal and support forward and reverse rotation. This allows the baking tray support, which is fixedly connected to the directional carriages, to maintain a stable horizontal posture and form a multi-layered cyclical motion within the tunnel oven. This fully utilizes the heating space within the tunnel oven, improves baking efficiency, and avoids the risk of baking trays shaking or tipping over. Attached Figure Description

[0031] The present invention will be further described below with reference to the accompanying drawings, wherein:

[0032] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention;

[0033] Figure 2 This is a schematic diagram of the directional vehicle structure according to Embodiment 2 of the present invention;

[0034] Figure 3 This is a front view of Embodiment 3 of the present invention;

[0035] Figure 4 This is a top view of Embodiment 3 of the present invention;

[0036] Figure 5 for Figure 4 A cross-sectional view at point AA;

[0037] Figure 6 for Figure 5 A schematic diagram of the directional trolley at the four corners after the side panels of the vehicle are hidden;

[0038] Figure 7 for Figure 6 Enlarged view of point B in the middle;

[0039] Figure 8 for Figure 6 Enlarged view of point C in the middle;

[0040] Figure 9 for Figure 6 Enlarged view at point D;

[0041] Figure 10 for Figure 6 Enlarged view of point E in the middle.

[0042] In the diagram: 1. Sprocket; 101. First arc-shaped groove; 102. First gear; 2. Guide wheel; 201. Second arc-shaped groove; 202. Second gear; 203. Transmission gear; 3. Power assembly; 301. Transmission shaft; 302. Gear motor; 303. Third gear; 4. Baking tray support; 5. Orienting trolley; 501. Connecting shaft; 502. Fixed roller; 503. Horizontal roller; 504. Vertical roller; 505. Angled roller; 506. 6. Side panel; 7. Directional track; 8. Vertical guide rail; 9. Transverse guide rail; 10. Transition guide rail; 11. Steering guide rail; 12. Movable pressure plate; 13. Movable shaft; 14. Limiting curved rail; 15. Pressure roller curved rail; 16. Protrusion; 17. Step plate; 18. Transmission layer; 19. Chain layer; 10. Bracket. Detailed Implementation

[0043] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0044] See Figure 1 This is an embodiment of the present invention. This embodiment specifically discloses a multi-layer tunnel oven baking tray rack translation and circulation transmission structure, including a support 10, a power component 3, a directional track 6, two chains 9, four pairs of sprockets 1, a pair of directional trolleys 5 and a baking tray rack 4.

[0045] Four pairs of sprockets 1 are symmetrically arranged on the front and rear sides of the bracket 10, and the sprockets 1 are arranged in pairs along the left and right directions and the vertical direction of the bracket 10 to form a rectangle. Two chains 9 are respectively wound around the sprockets 1 on the front and rear sides of the bracket 10.

[0046] The power unit 3 is used to drive at least one pair of sprockets 1 to rotate synchronously, so that two chains 9 rotate synchronously around the sprockets 1. Other sprockets 1 also rotate synchronously through the drive of the chains 9.

[0047] A pair of directional trolleys 5 are symmetrically arranged between two chains 9, and the two directional trolleys 5 are rotatably connected to the two chains 9 respectively. A baking tray bracket 4 is horizontally arranged along the front and rear direction, and the two ends of each baking tray bracket 4 are fixedly connected to a pair of directional trolleys 5 on the front and rear sides of the bracket 10 respectively.

[0048] Each sprocket 1 has a guide wheel 2 located 30cm to its left, which is connected to the sprocket 1 for transmission. The transmission method can be chain drive, gear drive, belt drive, etc. It is only necessary to keep the sprocket 1 and the guide wheel 2 rotating in the same direction. All guide wheels 2 are rotatably connected to the bracket 10. The sum of the radii of the guide wheel 2 and the sprocket 1 is less than 30cm, so that the guide wheel 2 and the sprocket 1 do not interfere with each other when they are rotating, when the directional trolley 5 passes by, and when the sprocket 1 and the guide wheel 2 are rotating.

[0049] The directional track 6 is fixedly installed inside the bracket 10. The directional track 6 is used to cooperate with the guide wheel 2 to limit the directional trolley 5 to always maintain a horizontal posture during the rotation of the chain 9.

[0050] It should be noted that in other embodiments, the number of sprockets 1 can be set according to the number of turns of the chain 9. In order to keep the chain 9 moving as horizontally and vertically as possible, the sprockets 1 are all set in pairs. For every two additional pairs of sprockets 1, the chain 9 has two more turns, which makes it easier for the chain 9 to stack into multiple rectangular combinations along its path. This allows the baking tray bracket 4, which is fixedly connected to the directional trolley 5, to maintain a stable horizontal posture and form a multi-layered cyclic movement in the tunnel oven, making full use of the heating space in the tunnel oven and improving baking efficiency.

[0051] The number of directional carriages 5 is set to ensure that the baking trays do not interfere with or collide with each other when they move in a multi-layered cycle with the chain 9 in a stable horizontal position. The more directional carriages 5 there are, the more baking tray supports 10 there are, and the more baking trays can be accommodated at the same time, resulting in higher baking efficiency.

[0052] See Figure 2 This is a second embodiment of the present solution, and a specific embodiment of the first embodiment. The directional trolley 5 in this embodiment includes a side plate 506, and a connecting shaft 501, a horizontal roller 503, a vertical roller 504, and an oblique roller 505 that are rotatably connected to the side plate 506. The connecting shaft 501 is perpendicularly connected to the side of the chain 9. The horizontal roller 503 is located 30cm away from the left side of the connecting shaft 501. The vertical roller 504 is located directly below the connecting shaft 501. The oblique roller 505 is located 20cm away from the left side of the vertical roller 504.

[0053] The outer side of the guide wheel 2 is provided with several second arc-shaped grooves 201 that cooperate with the horizontal roller 503;

[0054] The directional track 6 is used in conjunction with the horizontal roller 503, the vertical roller 504 and the diagonal roller 505 to ensure that the directional trolley 5 maintains a horizontal posture during the rotation of the chain 9.

[0055] The directional track 6 in this embodiment includes a vertical guide rail 601, a horizontal guide rail 602, a transition guide rail 603, and a turning guide rail 604;

[0056] Vertical guide rails 601 are arranged on both sides of vertical chain 9 in a vertical direction. The distance between the two vertical guide rails 601 is slightly larger than the diameter of vertical roller 504. The vertical guide rails 601 and vertical roller 504 abut against each other, so that the directional trolley 5 maintains a horizontal posture when moving in the vertical direction under the limit of vertical roller 504 and connecting shaft 501.

[0057] The transverse guide rail 602 is located on the lower side of the horizontal chain 9. The transverse guide rail 602 is used to abut against the transverse roller 503 so that when the directional trolley 5 moves in the horizontal direction, it maintains a horizontal posture by limiting the movement of the transverse roller 503 and the connecting shaft 501. The transverse guide rail 602 is provided with a first opening for avoiding the connecting shaft 501, the vertical roller 504 and the inclined roller 505.

[0058] The transition rail 603 is used to cooperate with the inclined roller 505 to keep the directional trolley 5 in a horizontal position when passing through the turning point of the chain 9. In particular, when the horizontal roller 503 passes through the first opening position, or at the corner where the downward movement changes to the horizontal movement, the transition rail 603 undertakes the limiting function of the horizontal roller 503 through cooperation with the inclined roller 505. This is also why the distance between the inclined roller 505 and the vertical roller 504 is smaller than the distance between the horizontal roller 503 and the connecting shaft 501.

[0059] The steering guide rail 604 is used to cooperate with the horizontal roller 503 to keep the directional trolley 5 in a horizontal orientation when turning vertically. The steering guide rail 604 is generally a quarter-circle arc track with the same turning radius as the chain 9.

[0060] Preferably, in this embodiment, a fixed roller 502 is sleeved on the connecting shaft 501. The fixed roller 502 is used to cooperate and abut with the vertical guide rail 601 and the horizontal guide rail 602. When the chain 9 is not taut, during the process of the directional trolley 5 passing through the vertical guide rail 601 or the horizontal guide rail 602, the fixed roller 502 plays the role of replacing the connecting shaft 501 and stabilizing the directional trolley 5. At this time, the connecting shaft 501 only plays the role of providing traction force.

[0061] See Figures 3 to 10 This is the third embodiment of the present invention. This embodiment is a more specific embodiment of the second embodiment. Through four pairs of sprockets 1 and four pairs of guide wheels 2, the directional trolley 5 is kept in a horizontal posture and moves in a rectangular cycle.

[0062] According to common knowledge, chain 9 typically includes chain plates, chain pins, and bushings. In this embodiment, chain 9 uses specially customized bushings. The outer diameters of the bushings, fixed rollers 502, horizontal rollers 503, vertical rollers 504, and inclined rollers 505 of chain 9 are all the same. Therefore, the shape and radius of the first arc groove 101 and the second arc groove 201 are the same. That is, sprocket 1 and guide wheel 2 can use the same parts, and the bushings, fixed rollers 502, horizontal rollers 503, vertical rollers 504, and inclined rollers 505 can directly use the same collars and bearings, saving procurement costs and simplifying structural complexity. The connecting shaft 501 is fixedly connected to one of the chain pins of chain 9, or the connecting shaft 501 can directly replace one of the chain pins of chain 9.

[0063] See Figure 3 In this embodiment, a first gear 102 is fixedly provided on the outer side of the sprocket 1, and a second gear 202 identical to the first gear 102 is fixedly provided on the outer side of the guide wheel 2. A transmission gear 203 is provided between the first gear 102 and the second gear 202, and the two ends of the transmission gear 203 are respectively engaged with the first gear 102 and the second gear 202 so that the first gear 102 and the second gear 202 rotate synchronously and in the same direction, thereby making the sprocket 1 and the guide wheel 2 rotate synchronously and in the same direction.

[0064] The guide wheel 2 and the sprocket 1 rotate synchronously in the same direction. The outer side of the guide wheel 2 is provided with several first arc-shaped grooves 101 that cooperate with the bushings of the chain 9. The radius of the base circle where the first arc-shaped groove 101 is located (the base circle here is the circle where the center of the first arc-shaped groove 101 is located) is the same as the radius of the base circle where the second arc-shaped groove 201 is located.

[0065] In other embodiments, gear transmission can also be replaced by chain transmission or other methods.

[0066] The power assembly 3 includes a drive shaft 301, a geared motor 302, and two third gears 303. The two third gears 303 are fixed at both ends of the drive shaft 301. The geared motor 302 is used to drive the drive shaft 301 to rotate. The two third gears 303 respectively cooperate with one of the pairs of first gears 102 on the front and rear sides of the bracket 10 to provide power for the rotation of the entire chain 9.

[0067] See Figure 4 For ease of description, in this embodiment, the front and rear sides of the frame are divided into a transmission layer 801, a chain layer 802, a transverse guide wheel layer 803, an auxiliary wheel layer 804, and a vertical guide wheel layer 805, based on their distance from the center of the frame, and the guide wheel layer 2 is located on the outside of the vehicle side panel 506.

[0068] The power assembly 3, as well as the first gear 102, the second gear 202, the transmission gear 203 and the third gear 303, are all located inside the transmission layer 801. The transmission layer 801 can be located on the outside of the bracket 10 for easy installation and maintenance, or it can be located on the inside of the bracket 10. Different designs can be adopted depending on the actual situation.

[0069] The chain layer 802 mainly contains a chain 9 and a sprocket 1.

[0070] The guide wheel 2, steering guide rail 604, horizontal roller 503 and fixed roller 502 are located in the horizontal guide wheel layer 803. The horizontal guide rail 602 crosses the chain layer 802 and is fixedly connected to the bracket 10, and cooperates with the horizontal roller 503 and fixed roller 502 in the horizontal guide wheel layer 803.

[0071] The auxiliary wheel layer 804 is equipped with inclined rollers 505 and transition rails 603. The transition rails 603 are fixedly connected to the bracket 10 through some connecting plates and avoid the movement trajectory of other components of the entire baking tray translation and circulation transmission structure.

[0072] The vertical guide wheel layer 805 is provided with a vertical roller 504. The vertical roller 504 is closest to the vehicle side plate 506. The vertical guide rail 601 spans the transverse guide wheel layer 803, the auxiliary wheel layer 804 and the vertical guide wheel layer 805 at the same time, so that the vertical guide rail 601 can cooperate with the vertical roller 504 and the fixed roller 502 at the same time.

[0073] Therefore, in this embodiment, the fixed roller 502 and the horizontal roller 503 are set on the same plane. The distance between the horizontal roller 503 and the side plate 506 is greater than the distance between the oblique roller 505 and the side plate 506. The distance between the oblique roller 505 and the side plate 506 is greater than the distance between the vertical roller 504 and the side plate 506. This is so that the movement trajectories of the horizontal roller 503, the vertical roller 504, and the oblique roller 505 are staggered and not on the same plane. This allows the vertical guide rail 601, the horizontal guide rail 602, and the transition guide rail 603 to be staggered between different layers. This ensures that the directional trolley 5 can maintain at least two support points that are restricted by the directional rail 6 at any position, thereby ensuring that the directional trolley 5 maintains a stable horizontal posture during the movement driven by the chain 9.

[0074] See Figure 7 This is the turning point where the directional trolley 5 enters the vertical downward movement track from the horizontal track moving laterally to the right. The directional track 6 here also includes a movable pressure plate 7 and a movable shaft 701. The movable pressure plate 7 includes a limiting curved track 702 and a pressure wheel curved track 703; the movable pressure plate 7 is located in the horizontal guide wheel layer 803;

[0075] One end of the movable shaft 701 is rotatably connected to the movable pressure plate 7, and the other end of the movable shaft 701 is fixedly connected to the bracket 10; the limiting curved rail 702 and the pressure roller curved rail 703 are respectively located on both sides of the movable shaft 701, and the limiting curved rail 702 is located above the sprocket 1, and the pressure roller curved rail 703 is located above the guide wheel 2.

[0076] The pressure roller curved rail 703 has an arc-shaped protrusion 704 below one end near the movable shaft 701; the other end of the pressure roller curved rail 703 has a lap plate 705. The lap plate 705 is used to prevent the pressure roller curved rail 703 from getting close to the guide wheel 2 by connecting the bracket 10. The protrusion is used to lift the pressure roller curved rail 703 when the fixed roller 502 passes by, so that the fixed roller 502 enters between the limiting curved rail 702 and the sprocket 1. When the fixed roller 502 abuts against the limiting curved rail 702, the pressure roller curved rail 703 and the protrusion cooperate to abut against the horizontal roller 503, so that the horizontal roller 503 fits against the second arc-shaped groove 201, thereby preventing the directional trolley 5 from tilting to the side due to excessive friction of the movable shaft 701.

[0077] See Figure 8 This is the turning point where the directional trolley 5 enters the horizontal track from the vertical downward movement track. If the friction of the movable shaft 701 is too large at this point, the horizontal roller 503 will be pressed down laterally. The arc-shaped transition guide 603 in the figure cooperates with the inclined roller 505 to counteract this downward pressure, so that the horizontal roller 503 fits into the second arc-shaped groove 201 of the guide wheel 2.

[0078] See Figure 9 This is the turning point where the directional trolley 5 enters the vertical upward movement track from the horizontal track that is laterally to the left. The steering guide rail 604, in cooperation with the horizontal roller 503, ensures that the horizontal roller 503 always fits against the second arc-shaped groove 201 of the guide wheel 2 when the chain 9 turns, thereby offsetting the friction of the movable shaft 701 and the gravity of the directional trolley 5 through the second arc-shaped groove 201.

[0079] See Figure 10 This is the turning point where the directional trolley 5 enters the horizontal track to the right from the vertical upward movement track. Here, the horizontal guide rail 602 has a first opening to avoid the connecting shaft 501, the vertical roller 504, and the inclined roller 505; the transition guide rail 603 is used to cooperate with the inclined roller 505. In particular, when the horizontal roller 503 passes through the first opening, it keeps the directional trolley 5 in a horizontal posture when passing through the turning point of the chain 9. This is why the distance between the inclined roller 505 and the vertical roller 504 is less than the distance between the horizontal roller 503 and the connecting shaft 501; the second arc-shaped groove 201 counteracts the friction of the movable shaft 701, and the second arc-shaped groove 201, the horizontal guide rail 602, and the transition guide rail 603 alternately bear the weight of the directional trolley 5.

[0080] Based on the same principle described above, the structure disclosed in this embodiment can also perform the same function of stabilizing and orienting the trolley 5 when rotating in the opposite direction or in other turning forms, so other turning methods will not be described in detail.

[0081] The above specific embodiments have further described in detail the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. In particular, it should be noted that any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention for those skilled in the art.

Claims

1. A translational and circulating transmission structure for a baking tray rack in a multi-layer tunnel oven, characterized in that, It includes a bracket (10), a power assembly (3), a directional track (6), two chains (9), n pairs of sprockets (1), m pairs of directional trolleys (5), and m baking tray holders (4); where n is an even number greater than or equal to 4, and m is a positive integer; n pairs of sprockets (1) are symmetrically arranged on the front and rear sides of the bracket (10), and the sprockets (1) are arranged in pairs along the horizontal and vertical directions of the bracket (10), and the two chains (9) are respectively wound around the sprockets (1) on the front and rear sides of the bracket (10). The power component (3) is used to drive the two chains (9) to rotate synchronously; m directional trolleys (5) are symmetrically arranged between two chains (9), and each directional trolley (5) is rotatably connected to one of the chains (9). m baking trays (4) are horizontally arranged in the front-back direction, and each baking tray (4) is fixedly connected to a pair of directional trolleys (5) at both ends. Each directional trolley (5) includes a side plate (506), and a connecting shaft (501), a horizontal roller (503), a vertical roller (504), and an oblique roller (505) rotatably connected to the side plate (506). The connecting shaft (501) is perpendicularly connected to the side of the chain (9). Each of the sprockets (1) is provided with a guide wheel (2) at a distance L on the left side, which is connected to the sprocket (1) for transmission. All the guide wheels (2) are rotatably connected to the bracket (10). The distance L is greater than the radius of the sprocket (1). The directional track (6) is fixedly installed inside the bracket (10). The directional track (6) is used to cooperate with the guide wheel (2) to limit the directional trolley (5) to maintain a horizontal posture during the rotation of the chain (9). The directional track (6) includes a vertical guide rail (601), a horizontal guide rail (602), a transition guide rail (603), and a steering guide rail (604). A fixed roller (502) is sleeved on the connecting shaft (501). The fixed roller (502) is used to cooperate and abut with the vertical guide rail (601) and the horizontal guide rail (602). The directional track (6) also includes a movable pressure plate (7) and a movable shaft (701), the movable pressure plate (7) including a limiting curved track (702) and a pressure wheel curved track (703); One end of the movable shaft (701) is rotatably connected to the movable pressure plate (7), and the other end of the movable shaft (701) is fixedly connected to the bracket (10); The limiting curved rail (702) and the pressure roller curved rail (703) are respectively disposed on both sides of the movable shaft (701), and the limiting curved rail (702) is disposed above the sprocket (1); The pressure roller curved rail (703) has an arc-shaped protrusion (704) below one end near the movable shaft (701); the other end of the pressure roller curved rail (703) has a mounting plate (705), the mounting plate (705) is used to prevent the pressure roller curved rail (703) from getting close to the guide wheel (2) by connecting the bracket (10), the protrusion (704) is used to lift the pressure roller curved rail (703) when the fixed roller (502) passes by, so that the fixed roller (502) enters between the limiting curved rail (702) and the sprocket (1), and when the fixed roller (502) abuts against the limiting curved rail (702), the pressure roller curved rail (703) and the protrusion (704) cooperate to abut against the transverse roller (503), so that the transverse roller (503) fits against the second arc-shaped groove (201) of the guide wheel (2).

2. The baking tray rack translation and circulation transmission structure of a multi-layer tunnel oven according to claim 1, characterized in that, The horizontal roller (503) is located at a distance L to the left of the connecting shaft (501), the vertical roller (504) is located directly below the connecting shaft (501), and the oblique roller (505) is located to the left of the vertical roller (504) at a distance less than L. The guide wheel (2) has several second arc-shaped grooves (201) on its outer side that cooperate with the horizontal roller (503); The directional track (6) is used in conjunction with the horizontal roller (503), vertical roller (504) and diagonal roller (505) to ensure that the directional trolley (5) maintains a horizontal posture throughout the rotation of the chain (9).

3. The baking tray rack translation and circulation transmission structure of a multi-layer tunnel oven according to claim 2, characterized in that, The vertical guide rail (601) is used to cooperate with the vertical roller (504) so ​​that the directional trolley (5) maintains a horizontal posture when moving in the vertical direction; The transverse guide rail (602) is used to cooperate with the transverse roller (503) so that the directional trolley (5) maintains a horizontal posture when moving in the horizontal direction; the transverse guide rail (602) is provided with a first opening for avoiding the connecting shaft (501), the vertical roller (504) and the inclined roller (505); The transition rail (603) is used to cooperate with the inclined roller (505) so that the directional trolley (5) maintains a horizontal posture when passing the turning point of the chain (9); The steering guide rail (604) is used to cooperate with the horizontal roller (503) so that the directional trolley (5) maintains a horizontal posture when turning from horizontal to vertical.

4. The baking tray rack translation and circulation transmission structure of a multi-layer tunnel oven according to claim 2, characterized in that, The distance between the horizontal roller (503) and the side panel (506) is greater than the distance between the oblique roller (505) and the side panel (506), and the distance between the oblique roller (505) and the side panel (506) is greater than the distance between the vertical roller (504) and the side panel (506).

5. The baking tray rack translational circulation transmission structure of a multi-layer tunnel oven according to claim 2, characterized in that, The guide wheel (2) rotates synchronously in the same direction as the sprocket (1). The outer side of the sprocket (1) is provided with a plurality of first arc-shaped grooves (101) that cooperate with the bushings of the chain (9). The radius of the base circle where the first arc-shaped groove (101) is located is the same as the radius of the base circle where the second arc-shaped groove (201) is located.

6. The baking tray rack translation and circulation transmission structure of a multi-layer tunnel oven according to claim 5, characterized in that, A first gear (102) is fixedly provided on one side of the sprocket (1), and a second gear (202) identical to the first gear (102) is fixedly provided on one side of the guide wheel (2). A transmission gear (203) is provided between the first gear (102) and the second gear (202), and the two ends of the transmission gear (203) are respectively engaged with the first gear (102) and the second gear (202).

7. The baking tray rack translational circulation transmission structure of a multi-layer tunnel oven according to claim 6, characterized in that, The power assembly (3) includes a drive shaft (301), a geared motor (302), and two third gears (303). The two third gears (303) are fixed at both ends of the drive shaft (301). The geared motor (302) is used to drive the drive shaft (301) to rotate. The two third gears (303) respectively cooperate with one of the pairs of first gears (102) on the front and rear sides of the bracket (10).

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