Chain wheel transmission structure

Abstract

The utility model relates to a chain wheel transmission structure, and belongs to the technical field of food processing equipment. The chain wheel transmission structure comprises a first chain wheel, a second chain wheel, a first track, a second track and a third track. The second chain wheel is located on the first side of the first chain wheel, the first track is located on the second side of the first chain wheel, the second chain wheel is higher than the first chain wheel, and the inner common tangent of the lower side of the first chain wheel and the upper side of the second chain wheel is the advancing direction of the chain. The first track is provided with an inclined guide face parallel to the advancing direction and a first horizontal guide face, the second track is provided with a second horizontal guide face, and the third track is provided with an arc-shaped guide face. According to the scheme, the overall height of the multi-layer tunnel furnace can be reduced, and the multi-layer tunnel furnace has the advantages of being stable in operation, small in occupied space and simple in structure.

Description

TECHNICAL FIELD

[0001] The utility model relates to food processing equipment technical field especially relates to a chain wheel drive structure. BACKGROUND

[0002] Food multilayer tunnel furnace is a kind of continuous baking equipment widely used in bread, biscuit, pastry, meat, aquatic products and other various food processing, usually by multilayer conveying system, heating system, ventilation system and control system etc. When working, food is placed on the conveying belt, slowly moves along with the conveying belt, and is sequentially through the heating area of each layer to realize baking, which has the advantages of high production efficiency, stable baking quality, saving manpower etc.

[0003] In the prior art, Chinese invention patent (application publication number: CN111011407A) discloses a turning motion structure and multilayer food baking tunnel furnace, chain and several chain wheel groups are arranged in the furnace body of multilayer tunnel furnace, and the chain is connected with several chain wheel groups in sequence to realize four-layer conveying circulation. The conveying platform for placing food material container is connected with the chain, can always keep horizontal posture under the driving of the chain, to realize efficient baking work. However, the multilayer food baking tunnel furnace needs the cooperation of four chain wheels to realize the reversing work of the chain in the actual use process, so the height between layers is limited by the structure of chain wheel group, and the height between the second conveying layer and the third conveying layer is much higher than the height between the first conveying layer and the second conveying layer or the height between the third conveying layer and the fourth layer, in order to avoid interference with the chain wheel group of the upper layer. Under the setting, on the one hand, the space height of the tunnel furnace is increased, the balance and stability of heat transfer between layers are reduced, on the other hand, the platform height of the discharging conveying layer needs to be lifted, and there is a problem that the cost is difficult to control. Based on this, under the premise of ensuring the baking efficiency of multilayer tunnel furnace, reducing the volume of multilayer tunnel furnace is a technical problem to be solved by the person skilled in the art. UTILITY MODEL CONTENTS

[0004] In order to overcome the problems in the related art, the utility model provides a chain wheel drive structure, which can reduce the overall height of the multilayer tunnel furnace, has the advantages of stable operation, small space occupation and simple structure.

[0005] The utility model provides a chain wheel drive structure, which comprises a first chain wheel, a second chain wheel, a first track, a second track and a third track.

[0006] The second chain wheel is located on the first side of the first chain wheel, the first track is located on the second side of the first chain wheel, the height of the second chain wheel is higher than that of the first chain wheel, the inner tangent line of the lower side of the first chain wheel and the upper side of the second chain wheel is the running direction of the chain, and the first track has an inclined guide surface parallel to the running direction.

[0007] The first track is provided with a straight section curved towards the second sprocket along the advancing direction, and the straight section has a first horizontal guide surface;

[0008] The second track is opposite to an axial end surface of the second sprocket, and the second track has a second horizontal guide surface;

[0009] The third track is located at the lower side of the first sprocket, and the third track has an arc-shaped guide surface.

[0010] In some embodiments, a mounting plate is further included, the first sprocket and the second sprocket are rotationally connected to the mounting plate through a rotating shaft, and the first track, the second track and the third track are all connected and fixed to the mounting plate through fixing columns.

[0011] In some embodiments, the inclination angle of the first track relative to a horizontal plane is 45°-75°.

[0012] In some embodiments, the mounting plate, the first track, the second track and the third track are all hot-rolled plates.

[0013] In some embodiments, the surface of the hot-rolled plate is provided with a polytetrafluoroethylene coating.

[0014] The technical scheme provided by the utility model can have the following beneficial effects:

[0015] When the technical scheme of the utility model is applied, the sprocket transmission structure is installed between the second conveying layer and the discharge conveying layer of the multi-layer tunnel, the lower side of the first sprocket is connected to the second conveying layer through a chain, and the chain is connected to the upper side of the second sprocket and then connected to the discharge conveying layer. The conveying platform is moved from the second conveying layer to the first sprocket under the driving of the chain, and after abutting against the third track, the horizontal posture of the conveying platform is maintained by the arc-shaped guide surface and the chain. After the conveying platform leaves the arc-shaped guide surface and enters the inclined guide surface, the advancing path of the conveying platform is the internal common tangent of the first sprocket and the second sprocket, and the horizontal posture of the conveying platform is maintained by the inclined guide surface and the chain. After the conveying platform reaches the straight section, the conveying platform moves horizontally, and the horizontal posture of the conveying platform is maintained by the first horizontal guide surface of the straight section and the second horizontal guide surface of the second track, thereby realizing stable transmission between the second conveying layer and the discharge conveying layer in the multi-layer tunnel furnace.

[0016] Compared with the prior art, the sprocket transmission structure only uses two sprockets to adjust the position of the conveying platform in the horizontal height, and maintains the horizontal posture of the conveying platform when it is inclined and rises through the first track and the internal common tangent, thereby saving half of the sprockets in structure and reducing the height design between the second conveying layer and the third conveying layer in the multi-layer tunnel furnace by about 40% in layout, thereby reducing the height of the multi-layer tunnel furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present invention.

[0018] Figure 1 This is a schematic structural diagram of a sprocket transmission structure shown in an embodiment of the present utility model;

[0019] Figure 2 This is the usage state of the sprocket transmission structure shown in the embodiment of the utility model;

[0020] Figure 3 This is another usage state diagram of the sprocket transmission structure shown in an embodiment of the present utility model;

[0021] Figure 4 This is another usage state diagram of the sprocket transmission structure shown in the embodiment of the present utility model;

[0022] Figure 5 This is a schematic diagram of the cooperation between the sprocket transmission structure and the conveying platform shown in an embodiment of the present utility model;

[0023] Figure 6 It is a structural schematic diagram of a multi-layer tunnel furnace shown in an embodiment of the present utility model.

[0024] Reference numerals:

[0025] 1. Sprocket drive structure; 11. Mounting plate; 12. First sprocket; 13. Second sprocket; 14. First track; 15. Second track; 16. Third track; 17. Inner common tangent; 18. Straight section;

[0026] 2. Tunnel furnace; 21. Feed end; 22. Discharge conveyor layer; 23. Sprocket assembly; 24. Chain; 25. Conveying platform; 251. Upper right bearing structure; 252. Upper left bearing structure; 253. Lower right bearing structure; 254. Lower left bearing structure; 26. Fire grate. DETAILED DESCRIPTION

[0027] The following describes preferred embodiments of the present invention in more detail with reference to the accompanying drawings. Although preferred embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. Rather, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0028] In the description of the utility model, it should be understood that the terms "one end", "the other end", "outside", "upper", "inside", "horizontal", "coaxial", "center", "end", "length", "outer end", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the utility model.

[0029] In addition, in the description of the present invention, “a plurality of” means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0030] Terms such as "upper," "above," "lower," and "below" used in this disclosure to indicate relative spatial positions are used for ease of description to describe the relationship of one unit or feature relative to another unit or feature as shown in the accompanying drawings. Terms indicating relative spatial positions may be intended to encompass different orientations of the device during use or operation other than the orientation shown in the drawings. For example, if the device in the drawings is turned over, a unit described as being "below" or "beneath" another unit or feature would be "above" the other unit or feature. Thus, the exemplary term "below" encompasses both above and below. The device may be oriented in other ways (rotated 90 degrees or in other orientations), and the spatially related descriptors used herein should be interpreted accordingly. In this disclosure, unless otherwise expressly specified or limited, terms such as "disposed," "sleeved," "connected," "through," and "plugged" should be understood broadly, for example, to mean a fixed connection, a detachable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; and internal communication between two elements or an interaction between two elements, unless otherwise expressly limited. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0031] In the prior art, most of the improvements to the multi-layer tunnel furnace have focused on the number of layers and the length direction, but have neglected to improve the transmission system in the tunnel furnace in order to achieve the purpose of manufacturing a smaller multi-layer tunnel furnace.

[0032] In order to overcome the problems existing in the related art, the present invention provides a sprocket transmission structure 1, in which the chain 24 maintains the horizontal posture of the conveying platform 25 through the first rail 14 under the drive of the first sprocket 12 and the second sprocket 13. It has the advantages of small space occupation and simple structure, and can reduce the height of the multi-layer tunnel furnace 2, thereby improving the application range of the multi-layer tunnel furnace 2.

[0033] In order to overcome the problems existing in the related art, the utility model provides a sprocket transmission structure 1, in which the conveying platform 25 is lifted under the action of the first sprocket 12 and the second sprocket 13, and in the process of lifting, the third rail 16, the first rail 14 and the second rail 15 successively maintain a stable horizontal posture. It has the characteristics of simple structure and small space occupation, and can reduce the overall height of the multi-layer tunnel furnace 2 to improve the application scenarios of the multi-layer tunnel furnace 2.

[0034] The technical solutions of the embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

[0035] like Figures 1 to 6 As shown, the present invention provides a sprocket transmission structure 1, comprising a first sprocket 12, a second sprocket 13, a first track 14, a second track 15 and a third track 16;

[0036] The second sprocket 13 is located on a first side of the first sprocket 12, and the first track 14 is located on a second side of the first sprocket 12. The second sprocket 13 is higher than the first sprocket 12. The inner common tangent 17 between the lower side of the first sprocket 12 and the upper side of the second sprocket 13 is the travel direction of the chain 24. The first track 14 has an inclined guide surface parallel to the travel direction.

[0037] Along the travel direction, the first track 14 is provided with a straight section 18 that curves toward the second sprocket 13 , and the straight section 18 has a first horizontal guide surface;

[0038] The second track 15 is opposite to the axial end surface of the second sprocket 13, and the second track 15 has a second horizontal guide surface;

[0039] The third track 16 is located at the lower side of the first sprocket 12 and has an arc-shaped guide surface.

[0040] like Figure 6As shown, the total length of the multi-layer tunnel furnace 2 is generally between 6 and 10 meters. The feed end 21 and the discharge conveyor layer 22 of the multi-layer tunnel furnace 2 are located at opposite ends of the length of the multi-layer tunnel furnace 2. The number of layers of the multi-layer tunnel furnace 2 is generally an even number, that is, 2, 4, 6, 8, 10, ... 2n, where n is a natural number. Therefore, the effective baking length of the multi-layer tunnel furnace 2 is generally (n-1) times the furnace length. In the prior art, in the inter-layer steering design between adjacent layers, four sprockets are used to achieve steering between adjacent layers, and other structures are used to ensure the horizontal position of the conveying platform 25 during steering (see Chinese Invention Patent Application No. CN111011407A). In the design of the multi-layer tunnel furnace 2, the bottom layer is vacant, and the discharge conveyor layer 22 needs to be connected to the second conveyor layer to facilitate discharge. Considering the manufacturing cost of the multi-layer tunnel furnace 2 and the portability of the discharge conveyor layer 22, the height of the second conveyor layer is generally lower than that of the discharge conveyor layer 22. Therefore, a sprocket set 23 is required between the second conveyor layer and the discharge conveyor layer 22 to transfer the conveyor platform 25 on the second conveyor layer to the discharge conveyor layer 22 to enable the baking tray discharge operation. At the same time, a sprocket set 23 is also required on the discharge conveyor layer 22 to transport and divert the empty conveyor platform 25, allowing it to enter the first conveyor layer, receive a new baking tray at the feed end 21, and enter the highest layer to complete the baking cycle.

[0041] The existing sprocket set 23, in order to ensure the stability of the conveying platform 25 in the steering, generally through the setting of four sprockets to cooperate, the four sprockets are side by side or parallel between two, the height occupied by two parallel sprockets is far greater than the sum of the diameters of the two sprockets, without considering the layout of the heating system, baking efficiency and economy, the height between each layer can be increased to enable the layout of the above-mentioned sprocket set 23 structure, but there is the shortcoming of poor economic applicability. Therefore, when designing the multi-layer tunnel furnace 2 with good economic benefits, not only the above-mentioned situation needs to be considered in the structure, but also the installability of the equipment and the adaptability to different installation occasions need to be considered. When the multi-layer tunnel furnace 2 uses natural gas to bake energy, in order to ensure that the baking trays between each layer can be evenly heated, it is necessary to arrange the fire grate 26 above and below the conveying platform 25, and the distance between the fire grate 26 of each layer and the conveying platform 25 is equal. In this case, undoubtedly, the way of increasing the height of each layer will reduce the thermal effect of the fire grate 26 and increase the manufacturing cost of the equipment, and thus lead to the overall height of the multi-layer tunnel furnace 2 being higher, which is limited by the height of the factory building. In addition, if only the clearance height between the second conveying layer and the third conveying layer is increased, although only the baking efficiency of the second conveying layer is affected, the height of the discharge conveying layer 22 becomes abnormally high, and when connected with other equipment, the whole set of equipment needs to be modified, which is more difficult to satisfy the customers.

[0042] Therefore, in order to ensure the baking efficiency of the multi-layer tunnel furnace 2 and its compatibility with other equipment, the inventor of the present invention replaced the sprocket assembly 23 between the second conveying layer and the discharge conveying layer 22 with the sprocket transmission structure 1 of the present invention. The first sprocket 12, the second sprocket 13, the first track 14, the second track 15, and the third track 16 are all made of steel, and the first sprocket 12, the second sprocket 13, the first track 14, the second track 15, and the third track 16 are symmetrically mounted on the steel frame of the tunnel furnace and located between the second conveying layer and the discharge conveying layer 22 of the multi-layer tunnel furnace 2. In some embodiments, the first sprocket 12, the second sprocket 13, the first track 14, the second track 15, and the third track 16 can be directly mounted and fixed on the frame of the multi-layer tunnel furnace 2 or a mounting plate 11 can be provided separately. After the first sprocket 12, the second sprocket 13, the first track 14, the second track 15, and the third track 16 are integrally mounted on the mounting plate 11, the mounting plate 11 is then mounted on the multi-layer tunnel furnace 2. The first sprocket 12 and the second sprocket 13 are arranged on the left and right sides of the conveyor. The first sprocket 12 is on the left side and close to the second conveyor layer, while the second sprocket 13 is on the right side and close to the discharge conveyor layer 22. The first sprocket 12 is at a lower level than the second sprocket 13. The first track 14 is located on the left side of the first sprocket 12. The inner common tangent 17 formed by the right side of the first sprocket 12 and the left side of the second sprocket 13 is the forward direction of the chain 24. The inner common tangent 17 is parallel to the first track 14. The distance between the inner common tangent 17 and the first track 14 is equal to the distance between the two upper bearing structures in the conveying platform 25, one of which is mounted on the chain 24. The two lower bearing structures in the conveying platform 25 have different axial lengths, with one lower bearing structure having a shorter axial length. When the conveying platform 25 enters the first sprocket 12 from the second conveyor layer, the lower bearing structure with the shorter axial length can avoid the third track 16. When the lower bearing structure with a longer axial length contacts the third rail 16, it can move along the curved guide surface of the third rail 16, causing the adjacent upper bearing structure to connect to the first rail 14. This allows both upper bearing structures in the conveying platform 25 to be simultaneously fixed. Driven by the chain 24, the conveying platform 25 maintains a horizontal position along the first rail 14. After reaching the straight section 18, the upper bearing structure continues to maintain the horizontal position of the conveying platform 25. At this time, the horizontal position of the conveying platform 25 is maintained by the two upper bearing structures. When the upper bearing structure leaves the straight section 18, the lower bearing structure with a shorter axial length is connected by the second rail 15. At this time, the horizontal position of the conveying platform 25 is maintained by the lower bearing structure with a shorter axial length and the upper bearing structure adjacent to the lower bearing structure with a shorter axial length. After the conveying platform 25 leaves the second rail 15, the horizontal position of the conveying platform 25 is maintained by the straight section 18 in the multi-layer tunnel furnace 2.As can be seen, when the conveying direction of the second conveying layer and the discharge conveying layer 22 is from left to right, the two upper bearing structures are the upper left bearing structure 252 and the upper right bearing structure 251, respectively. The lower bearing structure with the longer axial length is the lower left bearing structure 254, and the lower bearing structure with the shorter axial length is the lower right bearing structure 253. The upper right bearing structure 251 always maintains a stable fixed point on the conveying platform 25, while the other stable fixed point is switched sequentially by the third track 16, the first track 14, and the second track 15. Under this arrangement, the arrangement positions of the first sprocket 12 and the second sprocket 13 can achieve partial overlap in side projection, reducing the overall height of the first and second sprockets 12, 13 after assembly, allowing them to fit into a smaller installation space. Compared with the prior art, while maintaining the baking efficiency of the multi-layer tunnel furnace 2, this can reduce the installation height between the second and third conveying layers by approximately 40%, thereby reducing the volume of the multi-layer tunnel furnace 2.

[0043] Furthermore, the inclination angle of the first track 14 relative to the horizontal plane is 45° to 75°.

[0044] Furthermore, the mounting plate 11 , the first rail 14 , the second rail 15 and the third rail 16 are all hot-rolled plates.

[0045] Furthermore, the surface of the hot-rolled plate is provided with a polytetrafluoroethylene coating.

[0046] While various embodiments of the present invention have been described above, the above descriptions are illustrative and non-exhaustive, and are not intended to be limiting of the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is selected to best explain the principles of the embodiments, their practical applications, or improvements to existing technologies, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A sprocket transmission structure for a multi-layer tunnel furnace, characterized in that: It includes a first sprocket, a second sprocket, a first track, a second track and a third track; The second sprocket is located on a first side of the first sprocket, and the first track is located on a second side of the first sprocket. The second sprocket is higher than the first sprocket. The inner common tangent of the lower side of the first sprocket and the upper side of the second sprocket is the traveling direction of the chain. The first track has an inclined guide surface parallel to the traveling direction. Along the traveling direction, the first track is provided with a straight section curved toward the second sprocket, and the straight section has a first horizontal guide surface; The second track is opposite to the axial end surface of the second sprocket, and the second track has a second horizontal guide surface; The third track is located at the lower side of the first sprocket, and the third track has an arc-shaped guide surface.

2. The sprocket transmission structure according to claim 1, characterized in that: It also includes a mounting plate, the first sprocket and the second sprocket are rotatably connected to the mounting plate through a rotating shaft, and the first track, the second track and the third track are all connected and fixed to the mounting plate through fixing columns.

3. The sprocket transmission structure according to claim 2, characterized in that: The inclination angle of the first track relative to the horizontal plane is 45° to 75°.

4. The sprocket transmission structure according to claim 3, characterized in that: The mounting plate, the first rail, the second rail and the third rail are all hot-rolled plates.

5. The sprocket transmission structure according to claim 4, characterized in that: The surface of the hot-rolled plate is provided with a polytetrafluoroethylene coating.

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