Transmission mechanism and conveying device employing the same

Abstract

The present application relates to the technical field of conveying mechanism, and particularly relates to a transmission mechanism and a conveying device adopting the same, the transmission mechanism comprising a transmission wheel assembly, a transmission belt or a transmission chain and a tensioning assembly. The transmission wheel assembly comprises a main transmission wheel and a slave transmission wheel which are parallel and spaced apart. The transmission belt or the transmission chain is wound around the main transmission wheel and the slave transmission wheel. The tensioning assembly comprises a connecting piece and parallel rotating shafts and tensioning wheels. The two ends of the connecting piece are rotatably connected with the tensioning wheels and the rotating shafts respectively. The tensioning wheels are arranged between the main transmission wheel and the slave transmission wheel. The tensioning wheels can naturally fall under the action of gravity, so that the wheel surface of the tensioning wheels abuts against the inner surface of the transmission chain or the inner surface of the transmission belt, thereby tensioning the transmission belt or the transmission chain.

Description

Technical Field

[0001] This invention relates to the technical field of transmission equipment, and more specifically to a transmission mechanism and a conveying device using the transmission mechanism. Background Technology

[0002] In current belt drive mechanisms, tension pulleys are commonly used. The function of the tension pulley is to adjust the tension of the drive belt to a suitable range to ensure stable transmission. However, the adjustment range of current tension pulley mechanisms is relatively small. In some special applications of belt drive mechanisms, such as using belt drive mechanisms to drive liftable conveyor belts, the main drive pulley of the belt drive mechanism is connected to the drive motor to obtain power, while the driven pulley is connected to the drive roller of the conveyor belt to transmit power. The distance between the main drive pulley and the driven pulley will change due to the lifting and lowering of the conveyor belt. The resulting distance change is significantly larger than the conventional tension change of the drive belt. Conventional tension pulley mechanisms are difficult to adapt to this distance change, and their complex structure and time-consuming manufacturing process impose a certain burden on the processing cost of the transmission mechanism. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention proposes a transmission mechanism that can easily and quickly adjust the tension of a transmission belt or transmission chain to a suitable level, and achieve a wide adjustment range.

[0004] The present invention also proposes a conveying device employing the above-described transmission mechanism.

[0005] According to a first aspect of the present invention, a transmission mechanism includes a frame, a transmission wheel assembly, a transmission belt or transmission chain, and a tensioning assembly. The transmission wheel assembly includes a main transmission wheel and a driven transmission wheel that are parallel to each other and spaced apart, the distance between the main and driven transmission wheels being adjustable; the transmission belt or transmission chain is wound around the main and driven transmission wheels; the tensioning assembly includes a connector and a tensioning wheel, one end of the connector being rotatably connected to the frame, and the other end being rotatably connected to the tensioning wheel, which is disposed between the main and driven transmission wheels; the tensioning wheel can naturally fall under the action of gravity, so that the wheel surface of the tensioning wheel abuts against the inner surface of the transmission chain or the surface of the transmission belt, thereby tightening the transmission belt or transmission chain.

[0006] The transmission mechanism according to embodiments of the present invention has at least the following beneficial effects:

[0007] The connector acts like a link between the frame and the tensioning wheel, allowing the tensioning wheel to rotate around one end of the connector. With this structure, the tensioning wheel naturally hangs down under its own weight and the weight of the connector, thus applying pressure to the inner surface of the drive belt or chain, thereby tightening the drive belt or chain. It should be understood that by adjusting the length of the connector, the required tension adjustment range can be achieved; therefore, this embodiment of the invention can achieve a large tension amplitude.

[0008] According to some embodiments of the present invention, the axis of the main drive wheel, the axis of the driven wheel, and the axis of the tension wheel are all horizontally arranged.

[0009] According to some embodiments of the present invention, the connector includes a first connector and a second connector, the adjacent ends of the first connector and the second connector intersect and form an included angle, the first connector and the second connector are rotatably connected at the included angle position, the other end of the first connector is rotatably connected to the frame, and the other end of the second connector is rotatably connected to the tension wheel.

[0010] According to some embodiments of the present invention, the main drive wheel is coaxially connected to a main drive shaft, which is used to connect to an external power assembly to introduce rotational power.

[0011] According to some embodiments of the present invention, the first connector and the second connector are flat plate structures, and both the first connector and the second connector are perpendicular to the axis of the tensioning wheel.

[0012] According to a second aspect embodiment of the present invention, a conveying device employing the above-described transmission mechanism includes the above-described transmission mechanism, a second conveying mechanism, and a power assembly. The second conveying mechanism includes a second driving roller, a second driven roller, and a second conveyor belt. The second conveyor belt is wound around the second driving roller and the second driven roller and extends along the conveying path. The power assembly drives a main drive wheel to rotate, and the driven wheel is coaxially connected to the second driving roller.

[0013] The conveying device according to embodiments of the present invention has at least the following beneficial effects:

[0014] The second drive roller of the second conveying mechanism receives rotational power through a transmission mechanism. The tensioning component of the transmission mechanism has a simple structure, which can quickly and easily tighten the transmission belt or transmission chain, and the tensioning range is large, which can effectively ensure the stability of the device's conveying action.

[0015] According to some embodiments of the present invention, the conveying device further includes a moving component that drives a second conveying mechanism to move back and forth in a direction perpendicular to the surface of the second conveyor belt.

[0016] According to some embodiments of the present invention, the moving component includes a power unit and a moving part, the power unit driving the moving part, and the top end of the moving part being connected to a second conveying mechanism.

[0017] According to some embodiments of the present invention, the conveying device further includes a first conveying mechanism, which includes a first driving roller, a first driven roller, and a first conveyor belt. The first conveyor belt and the second conveyor belt are parallel to each other and arranged along the axial direction of the first driving roller.

[0018] According to some embodiments of the present invention, the power assembly includes a rotary motor, the motor shaft of which transmits rotational power to a first drive roller and a main drive shaft respectively via a transmission pair.

[0019] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0021] Figure 1 This is a schematic diagram of the transmission mechanism according to an embodiment of the present invention (the actual center distance of the transmission belt or transmission chain is less than the maximum center distance);

[0022] Figure 2 This is a schematic diagram of the transmission mechanism according to an embodiment of the present invention (the actual center distance of the transmission belt or transmission chain is equal to the maximum center distance);

[0023] Figure 3 Regarding an embodiment of the present invention Figure 1 Another structural diagram;

[0024] Figure 4 This is a schematic diagram of the structure of the second conveying mechanism according to an embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram of the structure of a conveying device according to an embodiment of the present invention.

[0026] Figure label:

[0027] Transmission wheel assembly 100; main transmission wheel 110; driven transmission wheel 120; first driven transmission wheel 121; second driven transmission wheel 122; auxiliary driven transmission wheel 123; main transmission shaft 130; transmission belt or transmission chain 200; tensioning assembly 300; connector 310; first connector 311; second connector 312; rotating shaft 320; first rotating shaft 321; second rotating shaft 322; tensioning wheel 330; tensioning shaft 340; power assembly 400; rotary motor 410; moving assembly 500; Power unit 510; Moving unit 520; Base 600; Fixed base 610; Movable base 620; Conveying mechanism 700; First conveying mechanism 710; First driving roller 711; First driven roller 712; First conveyor belt 713; Second conveying mechanism 720; Second driving roller 721; Second driven roller 722; Second conveyor belt 723; Auxiliary conveying mechanism 730; Auxiliary driving roller 731; Auxiliary driven roller 732; Auxiliary conveyor belt 733; Frame 800. Detailed Implementation

[0028] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0029] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the mechanism or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0030] In the description of this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0031] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0032] In the description of this invention, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0033] Please see Figures 1 to 4 This invention provides a transmission mechanism, including a transmission wheel assembly 100, a transmission belt or chain 200, and a tensioning assembly 300. The transmission wheel assembly 100 includes a main transmission wheel 110 and a driven transmission wheel 120 that are parallel to each other and spaced apart. The transmission belt or chain 200 is wound around the main transmission wheel 110 and the driven transmission wheel 120. The tensioning assembly 300 includes a connecting member 310, a rotating shaft 320, and a tensioning wheel 330 that are parallel to each other. The two ends of the connecting member 310 are rotatably connected to the tensioning wheel 330 and the rotating shaft 320, respectively. The connecting member 310 acts as a linkage between the rotating shaft 320 and the tensioning wheel 330, allowing the tensioning wheel 330 to move around the rotating shaft 320. The tensioning wheel 330 is located between the main transmission wheel 110 and the driven transmission wheel 120. The main drive wheel 110, driven drive wheel 120, tension wheel 330, and rotating shaft 320 are all horizontally arranged. The tension wheel 330 can hang naturally under gravity. In its hanging state, the wheel surface of the tension wheel 330 abuts against the inner surface of the drive chain or drive belt 200, and applies pressure to the inner surface of the drive chain or drive belt 200, thereby tightening the drive belt or drive chain 200. The connecting member 310 acts like a linkage between the rotating shaft 320 and the tension wheel 330. By setting the length of the connecting member 310, the desired rotation range of the tension wheel 330 can be obtained. The longer the connecting member 310, the greater the rotation range of the tension wheel 330. This embodiment of the invention thus achieves a larger tension adjustment range.

[0034] Specifically, the tensioning wheel 330 is coaxially connected to the tensioning shaft 340, the connecting member 310 may include a first connecting member 311 and a second connecting member 312 that are parallel to each other, the rotating shaft 320 may include a first rotating shaft 321 and a second rotating shaft 322, the first connecting member 311 has the first rotating shaft 321 and the second rotating shaft 322 rotatably inserted at both ends, the second connecting member 312 has the second rotating shaft 322 and the tensioning shaft 340 rotatably inserted at both ends, and the first connecting member 311 and the second connecting member 312 are rotatably connected through the second rotating shaft 322. In this configuration, the first connecting member 311 and the second connecting member 312 form a crank-connecting rod structure. Through the arrangement of the first connecting member 311 and the second connecting member 312, the tensioning shaft 340 can move around the first rotating shaft 321, and the second rotating shaft 322 can exert a downward pulling force on the tensioning shaft 340 under its own gravity, thereby further strengthening the tensioning effect of the tensioning wheel 330 on the transmission belt or transmission chain 200.

[0035] In this embodiment, it is recommended that the first connector 311 and the second connector 312 be made of flat plate structure, and the first rotating shaft 321 and the second rotating shaft 322 are perpendicular to the first connector 311 and the second connector 312. The advantage of using a flat plate structure is that the plate material is easy to obtain and process, and the requirements for the external dimensions of the connector 310 are not high in this embodiment. Therefore, using a plate material to manufacture the connector 310 is a more ideal approach. More importantly, compared with a strip structure, the flat plate structure has a larger area and therefore a greater weight, which can generate a more significant tensile force on the tensioning shaft 340.

[0036] It should be further noted that, since transmission belts typically undergo permanent deformation and loosen after a period of operation, affecting the working capacity of the belt drive, the tensioning component 300 in this embodiment of the invention is mainly applied to transmission belts that are primarily belt-driven, enabling the transmission belt to maintain its initial tension. Of course, in other embodiments, the tensioning component 300 can also be used to tighten the transmission chain of a chain drive mechanism.

[0037] The transmission mechanism also includes a power assembly 400, which drives the main drive wheel 110 to rotate. Specifically, the main drive wheel 110 is coaxially connected to the main drive shaft 130. The power assembly 400 includes a rotary motor 410, whose motor shaft drives the main drive shaft 130 to transmit rotational power to the main drive wheel 110. The main drive wheel 110 then drives the transmission belt or transmission chain 200 to rotate the drive wheel 120, which in turn transmits the rotational motion to the subsequent connecting components, thus completing the power transmission.

[0038] In order to simplify the overall structure, the first rotating shaft 321 can be coaxially arranged with the main drive shaft 130. Specifically, one end of the main drive shaft 130 forms the first rotating shaft 321 or is connected to the first rotating shaft 321. Thus, the tension wheel 330 is connected to the main drive shaft 130 through the connector 310.

[0039] In addition, please see Figures 1 to 5 The present invention provides a conveying device employing the above-described transmission mechanism, the conveying device including the above-described transmission mechanism, conveying mechanism 700 and moving component 500.

[0040] Specifically, the conveying mechanism 700 includes a second conveying mechanism 720, which comprises a second driving roller 721, a second driven roller 722, and a second conveyor belt 723. The second conveyor belt 723 is wound around the second driving roller 721 and the second driven roller 722 and extends along the conveying path. The moving component 500 drives the second conveying mechanism 720 to move back and forth in a direction perpendicular to the surface of the second conveyor belt 723, thereby realizing the lifting and lowering of the second conveying mechanism 720. The transmission mechanism is connected to the conveying mechanism 700, specifically through a drive wheel 120 coaxially connected to the second driving roller 721, thereby transmitting the power of the power component 400 to the second conveying mechanism 720.

[0041] Furthermore, the conveying device also includes a movable component 500 and a movable base 620 to realize the lifting and lowering of the second conveying mechanism 720, thereby meeting the needs of different conveying heights. The second conveying mechanism 720 is disposed on the top surface of the movable base 620, and the transmission mechanism is disposed on the side of the movable base 620. Specifically, the driven wheel 120 is rotatably connected to the side of the movable base 620, and the main drive wheel 110 is disposed below the movable base 620. The movable component 500 drives the movable base 620 to move the driven wheel 120 away from or closer to the main drive wheel 110, thereby increasing or decreasing the distance between the main drive wheel 110 and the driven wheel 120, thereby changing the center distance of the transmission belt or transmission chain 200, and thus adapting to the conveying mechanism with lifting function.

[0042] The moving component includes a power unit and a moving unit. The power unit drives and connects to the moving unit, and the top of the moving unit is connected to the movable base. A frame is provided below the first conveying mechanism and the second conveying mechanism, and the power unit is fixedly mounted on the frame.

[0043] When the moving component 500 drives the second conveying mechanism 720 to descend, so that the driven pulley 120 approaches the main drive pulley 110, the transmission belt or transmission chain 200 generates redundant length. At this time, the tensioning pulley 330 naturally falls under the action of gravity, thereby tightening the transmission belt or transmission chain 200 with redundant length. When the moving component 500 drives the second conveying mechanism 720 to rise, so that the driven pulley 120 moves away from the main drive pulley 110, the transmission belt or transmission chain 200 tends to straighten. The tensioning pulley 330 is supported by the gradually straightening transmission belt or transmission chain 200 and moves upward together. At this time, the tensioning pulley 330 basically does not have a tensioning effect, but merely follows the direction of the transmission belt or transmission chain 200 and abuts against its inner surface.

[0044] In cases where the conveying path is relatively long, two conveyor belts connected end-to-end are often installed along the conveying path, with the conveyor belts spliced ​​together to form a longer conveying path. In this case, the conveying device is also equipped with an auxiliary conveying mechanism 730, which includes an auxiliary driving roller 731, an auxiliary driven roller 732, and an auxiliary conveyor belt 733. The second conveying mechanism 720 and the auxiliary conveying mechanism 730 are arranged along the conveying path, and the second driving roller 711 and the auxiliary driving roller 731 are arranged adjacent to each other.

[0045] In this regard, the driven wheel 120 includes a first driven wheel 121, a second driven wheel 122, and an auxiliary driven wheel 123. The first driven wheel 121 and the second driven wheel 122 are set at the same height. The first driven wheel 121 is coaxially connected to the second driving roller 711, and the second driven wheel 122 is coaxially connected to the auxiliary driving roller 731. The transmission mechanism thus transmits rotational power to the second conveying mechanism 720 and the auxiliary conveying mechanism 730. Further, the auxiliary driven wheel 123 is located below the center line connecting the first driven wheel 121 and the second driven wheel 122, thereby tightening the transmission belt or transmission chain 200 between the first driven wheel 121 and the second driven wheel 122. The main driven wheel 110 is located below the auxiliary driven wheel 123. The transmission belt or transmission chain 200 abuts against the main driven wheel 110, the first driven wheel 121, the auxiliary driven wheel 123, and the second driven wheel 122 in sequence. The tensioning pulley 330 is located between the main drive pulley 110 and the second driven pulley 122, and the wheel surface of the tensioning pulley 330 abuts against the drive belt or drive chain 200 located between the main drive pulley 110 and the second driven pulley 122. The connecting member 310 is located on the outside of the drive belt or drive chain 200.

[0046] Based on these structural characteristics, and considering that the conveying device has a moving component to change the center distance of the transmission belt or chain 200, the length of the transmission belt or chain 200 needs to be set long enough to reach the maximum center distance. When the main drive pulley 110 and the driven pulley 120 are close to each other, the center distance of the transmission belt or chain is less than the maximum center distance, resulting in redundant length in the transmission belt or chain 200. Under the action of gravity, the tensioning pulley 330 will be located outside the line connecting the axes of the main drive pulley 110 and the second driven pulley 122, thereby pulling the transmission belt or chain 200 outward and downward to achieve tensioning. When the main drive pulley 110 and the driven pulley 122 are far apart, the center distance of the transmission belt or chain 200 is closer to the maximum center distance. When the redundant length of the transmission belt or transmission chain 200 is reduced, the tensioning pulley 330 will still be located outside the line connecting the axes of the main drive pulley 110 and the second driven pulley 122, thus generating a certain tension force on the transmission belt or transmission chain 200. When the main drive pulley 110 and the driven pulley 120 move away from each other until the maximum center distance is reached, the transmission belt or transmission chain 200 will be taut. At this time, the tensioning pulley 330 will be located inside the line connecting the axes of the main drive pulley 110 and the second driven pulley 122. In this case, the tensioning pulley 330 will be effectively supported by the transmission belt or transmission chain 200 and will lightly rest against the inner surface of the transmission belt or transmission chain 200, basically without squeezing the transmission belt or transmission chain 200, thus ensuring the normal transmission of the transmission belt or transmission chain 200.

[0047] In addition, for some workpieces to be transported with uneven surfaces, the conveying mechanism 700 also includes a first conveying mechanism 710. The height of the first conveying mechanism 710 is not adjustable or is provided with other moving mechanisms to achieve independent lifting. The second conveying mechanism 720 corresponds to the first conveying mechanism 720. Under the action of the moving component 500, the second conveying mechanism 720 presents a different conveying height than the first conveying mechanism 720, so as to adapt to the workpieces to be transported with uneven surfaces and realize the horizontal placement of the workpieces to be transported.

[0048] Specifically, the first conveying mechanism 710 includes a first driving roller 711, a first driven roller, and a first conveyor belt 712. The first driving roller 711 and the second driving roller 712 are coaxial and spaced apart. The first conveyor belt 712 is parallel to the second conveyor belt 722. The first conveying mechanism is mounted on a fixed base 610, which is fixedly mounted on a frame 800. The second conveying mechanism 720 is mounted on a movable base 620. The first conveyor belt 712, the second conveyor belt 722, and the movable base 620 are all horizontally arranged. The moving component 500 drives the movable base 620 and the second conveying mechanism 720 to move up and down, creating a height difference between the second conveyor belt 722 and the first conveyor belt 712. This accommodates workpieces with height differences, thereby achieving the flat placement of the workpieces.

[0049] To ensure that the forward speeds of the first conveyor belt 712 and the second conveyor belt 722 are consistent, the first drive roller 711 and the second drive roller 721 need to be driven and connected by the same rotary motor 410, thus forming a three-axis transmission structure. Specifically, the rotary motor 410 is located on one side of the first drive roller 711 and the second drive roller 721. The motor shaft of the rotary motor 410 is connected to the first drive roller 711 and the main drive shaft 130 respectively through a gear set or a belt drive set, thereby transmitting rotational power to the first drive roller 711 and the main drive shaft 130 respectively. Since the first conveyor belt 712 and the second conveyor belt 722 are arranged at intervals along the horizontal plane, one end of the main drive shaft 130 is used to receive the rotational power of the rotary motor 410, and the other end transmits the power to the driven pulley 120 through a drive belt or drive chain. The second driven pulley 122 is coaxially connected to the second drive roller 721, so that the main drive shaft 130 can transmit the rotational power to the second drive roller 721. Thus, by pre-designing the parameters of the drive wheel assembly 100 to obtain an appropriate transmission ratio, the rotational speeds of the first drive roller 711 and the second drive roller 721 can be made consistent.

[0050] During the process of the moving component 500 driving the second conveying mechanism 720 to rise and fall, the tensioning component 300 can pull down the transmission belt or transmission chain 200 that has generated redundant length to prevent the transmission belt or transmission chain from becoming loose.

[0051] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.

Claims

1. A delivery device, characterized in that, The transmission mechanism, the second conveying mechanism, the power assembly, the moving assembly and the first conveying mechanism are included. The transmission mechanism includes a rack, a transmission wheel assembly including a main transmission wheel and a slave transmission wheel arranged in parallel and at intervals, a distance between the main transmission wheel and the slave transmission wheel being adjustable, a transmission belt or a transmission chain wound on the main transmission wheel and the slave transmission wheel, and a tensioning assembly including a connecting piece and a tensioning wheel, one end of the connecting piece being rotatably connected to the rack, the other end of the connecting piece being rotatably connected with the tensioning wheel, the tensioning wheel being arranged between the main transmission wheel and the slave transmission wheel, the tensioning wheel being able to naturally fall under the action of gravity so that the wheel surface of the tensioning wheel abuts against the surface of the transmission belt or the transmission chain, thereby tensioning the transmission belt or the transmission chain. The second conveying mechanism includes a second driving roller, a second driven roller and a second conveying belt, the second conveying belt being wound on the second driving roller and the second driven roller and being arranged along a conveying path, the power assembly being drivingly connected to the main transmission wheel to drive the main transmission wheel to rotate, the slave transmission wheel being coaxially connected to the second driving roller. The moving assembly is drivingly connected to the second conveying mechanism so that the second conveying mechanism moves back and forth in a direction perpendicular to the belt surface of the second conveying belt. The first conveying mechanism includes a first driving roller, a first driven roller and a first conveying belt, the first conveying belt and the second conveying belt being arranged in parallel along the axial direction of the first driving roller. The first conveying mechanism is arranged on a fixed base, the fixed base being fixedly arranged on the rack, the second conveying mechanism being arranged on a movable base, the first conveying belt, the second conveying belt and the movable base being horizontally arranged, the moving assembly driving the movable base and the second conveying mechanism to move up and down, so that a height difference is formed between the second conveying belt and the first conveying belt, thereby adapting to the height difference of the workpiece to be conveyed and realizing the horizontal placement of the workpiece to be conveyed. The conveying device further includes an auxiliary conveying mechanism, the auxiliary conveying mechanism including an auxiliary driving roller, an auxiliary driven roller and an auxiliary conveying belt, the second conveying mechanism and the auxiliary conveying mechanism being arranged along the conveying path, the second driving roller being arranged adjacent to the auxiliary driving roller. The slave transmission wheel includes a first slave transmission wheel, a second slave transmission wheel and an auxiliary slave transmission wheel, the first slave transmission wheel and the second slave transmission wheel being arranged at the same height, the first slave transmission wheel being coaxially connected to the second driving roller, the second slave transmission wheel being coaxially connected to the auxiliary driving roller.

2. The delivery device of claim 1, wherein, The axes of the main transmission wheel, the slave transmission wheel and the tensioning wheel are horizontally arranged.

3. The delivery device of claim 2, wherein, The connecting piece includes a first connecting piece and a second connecting piece, adjacent ends of the first connecting piece and the second connecting piece intersecting and forming an included angle, the first connecting piece and the second connecting piece being rotatably connected at the position of the included angle, the other end of the first connecting piece being rotatably connected to the rack, the other end of the second connecting piece being rotatably connected to the tensioning wheel.

4. The delivery device of claim 3, wherein, The main transmission wheel is coaxially connected with a main transmission shaft, which is used for connecting with an external power assembly to introduce rotating power.

5. The delivery device of claim 3, wherein, The first connecting piece and the second connecting piece are flat plate structures, and both the first connecting piece and the second connecting piece are perpendicular to the axis of the tensioning wheel.

6. The delivery device of claim 1, wherein, The moving assembly comprises a power part and a moving part, the power part is drivingly connected with the moving part, and the top end of the moving part is connected with the second conveying mechanism.

7. The delivery device of claim 4, wherein, The power assembly comprises a rotating motor, and a motor shaft of the rotating motor transmits rotating power to the first driving roller and the main transmission shaft through a transmission pair respectively.

Images