Automatic packaging and conveying device for flour and rice food

Abstract

The invention is suitable for the technical field of food processing, and particularly relates to an automatic flour and rice food packaging and conveying device which comprises a rack, a conveying assembly and an anti-sticking assembly, the conveying assembly is used for continuously and stably conveying various flour and rice foods, and the anti-sticking assembly uniformly sprays a proper amount of flour to the surface of a supporting rod; and the problem of adhesion of the food in the conveying process is effectively prevented. The anti-sticking assembly is jointly composed of a powder spraying pipe, a Venturi pipe and a driving mechanism, flour is sucked in by means of negative pressure generated by the Venturi effect, uniform spraying is achieved, meanwhile, the concentration of sprayed powder can be accurately controlled through an adjusting valve, and various auxiliary structures such as a cooling assembly, an adjustable side guide plate and a baffle are further integrated; comprehensive anti-sticking protection, efficient cooling, accurate guiding and reliable positioning can be achieved in the conveying process of rice food, so that the overall efficiency of automatic packaging is remarkably improved, and the quality of final products is effectively guaranteed.

Description

Technical Field

[0001] This invention belongs to the field of food processing technology, and in particular relates to an automatic packaging and conveying device for rice and flour products. Background Technology

[0002] In automated packaging production of rice and flour products, conveyor belts or support rods are often used for continuous conveying. However, rice and flour products (such as noodles and rice noodles) are prone to sticking, especially when warm, and are more likely to adhere to the conveying components, leading to product damage, shape deformation, or downtime for cleaning, affecting production efficiency and product quality.

[0003] While some anti-sticking measures exist in existing technologies, such as the utility model patent with publication number CN223182866U, which discloses a steamed bun forming machine, this machine uses a flour roller with a semi-circular groove that rotates synchronously with the conveyor belt to intermittently scoop up flour from the flour hopper and sprinkle it onto the surface of the conveyor belt. However, this solution has some shortcomings: First, the semi-circular grooves on the flour roller are spaced apart, meaning the flour sprinkling action is intermittent, resulting in a discontinuous strip-like distribution of flour on the conveyor belt with poor uniformity. Second, the amount of flour sprinkled mainly depends on the volume of the flour hopper, making it difficult to achieve precise and continuous adjustment. This can easily lead to excessively thick local flour layers, resulting in flour waste, uneven flour layers on the food surface affecting the appearance, and frequent food sticking and breakage due to unstable anti-sticking effects. Summary of the Invention

[0004] This invention provides an automatic packaging and conveying device for rice and flour products, aiming to solve the above-mentioned problems.

[0005] This invention is implemented as follows: an automatic packaging and conveying device for rice and flour products, comprising: frame; The conveying assembly mounted on the frame includes a drive belt, a drive wheel for driving the drive belt, and multiple support rods spaced apart on the drive belt for conveying rice and flour products. An anti-stick component, installed within the frame and located below the conveying assembly, is used to spray flour onto the surface of the support rod. The anti-stick component is located within the flour hopper inside the frame. The anti-stick component includes: The powder spraying pipe has multiple spray holes spaced apart on its upper surface for spraying flour onto the surface of the support rod. The top end of the Venturi tube is fixedly connected to and communicates with the powder spraying pipe. Multiple powder suction holes are opened on the bottom side wall to communicate with the inside of the flour hopper. The bottom end of the Venturi tube is also connected to a second air inlet pipe, which is connected to an external air source. The flour in the flour hopper is sucked in by the Venturi effect and then sprayed out through the powder spraying pipe. The second air inlet pipe is equipped with a regulating valve to control the air intake and adjust the powder spraying concentration. The drive mechanism is used to drive the Venturi tube and the powder spraying tube to reciprocate. It is located on one side of the Venturi tube and is connected to the Venturi tube.

[0006] Preferably, the drive belt has two symmetrical sections, and multiple support rods are connected between the two drive belts. A first stepper motor for driving the drive wheel to rotate is fixedly installed on the frame.

[0007] Preferably, the bottom end of the venturi tube is hinged to the bottom of the flour silo, and the drive mechanism includes: A turntable is located on one side of the venturi tube, and a pin is eccentrically fixed on the end face of the turntable. A long groove is provided on the side wall of the venturi tube along its length for the pin to be inserted and slide. A second stepper motor is fixed to the frame, and the output shaft of the second stepper motor is fixedly connected to the turntable.

[0008] Preferably, the frame is provided with symmetrical side guide plates on the upper side of the conveying assembly, and multiple guide rollers are rotatably installed at intervals on the opposite surfaces of the two side guide plates.

[0009] Preferably, the side guide plate is fixedly connected to the telescopic ends of multiple telescopic rods fixedly installed on the frame, and the telescopic rods are used to adjust the distance between the two side guide plates.

[0010] Preferably, a cooling assembly is mounted on the frame, the cooling assembly comprising: A cooling plate is arranged along the conveying direction. The cooling plate is located inside the drive belt. The cooling plate has a cooling channel inside. A number of air outlet holes communicating with the cooling channel are evenly opened on the upper surface of the cooling plate. A first air intake pipe is connected at one end to the cooling plate and communicates with the cooling channel, and the other end of the first air intake pipe is connected to an external cooling air source. A regulating valve is installed on the first air intake pipe.

[0011] Preferably, the cooling assembly further includes two adjusting plates, which are movably inserted into the cooling channels of the cooling plate from both side walls of the cooling plate. The adjusting plates are fixedly connected to adjacent side guide plates via connecting rods.

[0012] Preferably, the conveying assembly is provided with multiple baffles at intervals, the baffles are arranged vertically along the conveying direction, the baffles are rotatably connected to a support rod, a connecting plate is fixed to the back of the baffle, the connecting plate is connected to another support rod by an elastic rope, and the baffles are telescopic structures.

[0013] Preferably, multiple support rods on the front side of the baffle are respectively mounted on the drive belt via mounting sleeves. The mounting sleeves are rotatably connected to the drive belt, and the inner diameter of the mounting sleeves is larger than the outer diameter of the support rods. The mounting sleeves and support rods are connected by multiple circumferentially spaced connecting springs, allowing the support rods to suspend within the mounting sleeves. Gears are fixed on the mounting sleeves, and racks that mesh with the gears are fixed on the frame along the conveying direction. Through the meshing transmission of the gears and racks, and the floating connection of the connecting springs, the support rods can continuously and slowly rotate and generate micro-vibrations during the conveying process, thereby effectively changing their contact points with the food and significantly reducing the risk of adhesion caused by long-term contact.

[0014] Compared with the prior art, the embodiments of this application have the following main advantages: The anti-stick component evenly sprays flour onto the surface of the support rod, effectively preventing flour and rice products from sticking together during transportation, reducing downtime for cleaning, and improving production efficiency. The venturi tube and powder spraying tube work together with a reciprocating oscillating mechanism to achieve flour intake and spraying. The powder concentration is adjustable to meet different process requirements.

[0015] The cooling assembly can quickly cool and shape the food during transportation, preventing surface softening and sticking, as well as condensation inside the packaging. The spacing of the side guide plates is adjustable, and the air outlet area of ​​the cooling plate can be adaptively adjusted to meet the transportation and cooling needs of products of different widths. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of an automatic packaging and conveying device for rice and flour products provided by the present invention.

[0017] Figure 2 This is a top view of an automatic packaging and conveying device for rice and flour products provided by the present invention.

[0018] Figure 3 yes Figure 1 Enlarged view of point A in the image.

[0019] Figure 4 yes Figure 1 Enlarged view of point B in the image.

[0020] Figure 5 This is a schematic diagram of the baffle structure in an automatic packaging and conveying device for rice and flour products provided by the present invention.

[0021] Figure 6 This is a schematic diagram of the structure of the cooling plate, adjusting plate, and side guide plate in an automatic packaging and conveying device for rice and flour products provided by the present invention.

[0022] Figure reference numerals: 1. Frame; 2. Flour silo; 3. Drive wheel; 4. Drive belt; 5. Support rod; 6. Guide roller; 7. Side guide plate; 8. Baffle; 9. Gear; 10. Rack; 11. Cooling plate; 12. Adjusting plate; 13. First air inlet pipe; 14. Connecting plate; 15. Elastic rope; 16. Powder spraying pipe; 17. Venturi tube; 18. Turntable; 19. Pin; 20. Long groove; 21. Powder suction hole; 22. Second air inlet pipe; 23. Telescopic rod; 24. First stepper motor; 25. Connecting rod; 26. Air outlet; 27. Connecting spring. Detailed Implementation

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings of this application are used to distinguish different objects, not to describe a particular order.

[0024] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0025] This invention provides an automatic packaging and conveying device for rice and flour products, such as... Figures 1-6 As shown, it includes: Rack 1; The conveying assembly mounted on the frame 1 includes a drive belt 4, a drive wheel 3 for driving the drive belt 4, and multiple support rods 5 spaced apart on the drive belt 4 for conveying rice and flour products. Preferably, the drive belt 4 has two symmetrical drive belts, and the multiple support rods 5 are connected between the two drive belts 4. The drive belt 4 can be a chain, synchronous belt, belt, etc., and the drive wheel 3 can be a sprocket, synchronous pulley, belt pulley, etc. that cooperates with it. The frame 1 is fixedly mounted with a first stepper motor 24 for driving the drive wheel 3 to rotate, which can be fixed by bolts. An anti-stick component, installed within the frame 1 and located below the conveying assembly, is used to spray flour onto the surface of the support rod 5 to reduce the adhesion of flour and rice products to the support rod 5. The anti-stick component is located within the flour hopper 2 inside the frame 1. The anti-stick component includes: The powder spraying pipe 16 has multiple spray holes spaced apart on its upper surface for spraying flour onto the surface of the support rod 5. A Venturi tube 17, whose top end is fixedly connected to and communicates with the powder spraying pipe 16, has multiple powder suction holes 21 on its bottom side wall to communicate with the inside of the flour hopper 2. The bottom end of the Venturi tube 17 is also connected to a second air inlet pipe 22, which can be connected through a pipe connector. The second air inlet pipe 22 is connected to an external air source and uses the Venturi effect to suck in the flour in the flour hopper 2 and spray it out through the powder spraying pipe 16. The second air inlet pipe 22 is equipped with a regulating valve to control the air intake and adjust the powder spraying concentration. The drive mechanism used to drive the Venturi tube 17 and the powder spraying tube 16 to reciprocate is located on one side of the Venturi tube 17 and is connected to the Venturi tube 17 to expand the powder spraying coverage and ensure that the surface of the support rod 5 is uniformly powdered. During operation, the first stepper motor 24 is started, driving the drive wheel 3 to rotate, causing the drive belt 4 to circulate, thereby conveying the flour and rice products on the support rod 5 forward. When the support rod 5 reaches the anti-stick component area, the drive mechanism starts simultaneously, causing the venturi tube 17 and the powder spraying pipe 16 to reciprocate along the conveying direction. High-pressure airflow enters the venturi tube 17 through the second air inlet pipe 22, and draws flour from the flour hopper 2 through the powder suction hole 21. The flour is then evenly sprayed out from the spray nozzles on the powder spraying pipe 16, adhering to the surface of the support rod 5 to form an anti-stick layer, effectively preventing the flour and rice products from sticking together. By adjusting the air intake volume with the regulating valve, the powder spraying concentration can be precisely controlled to adapt to different production needs.

[0026] In this embodiment, the bottom end of the venturi tube 17 is hinged to the bottom of the flour silo 2, and the driving mechanism includes: A turntable 18 is provided on one side of the venturi tube 17. A pin 19 is eccentrically fixed on the end face of the turntable 18. A long groove 20 is provided on the side wall of the venturi tube 17 along its length direction for the pin 19 to be inserted and slide. A second stepper motor (not shown in the figure) is fixed on the frame 1. The output shaft of the second stepper motor is fixedly connected to the turntable 18, driving the turntable 18 to rotate. The rotational motion is converted into the reciprocating oscillation of the venturi tube 17 through the cooperation of the pin 19 and the long groove 20, which drives the powder spraying tube 16 to swing synchronously, thereby expanding the powder spraying coverage area. During the reciprocating oscillation of the venturi tube 17, the powder suction hole 21 continuously sucks in flour from different positions in the flour hopper 2, avoiding local powder accumulation.

[0027] Preferably, the frame 1 is symmetrically provided with side guide plates 7 on the upper side of the conveying assembly, and multiple guide rollers 6 are rotatably installed at intervals on the opposite surfaces of the two side guide plates 7 for conveying and guiding the rice food.

[0028] Furthermore, the side guide plate 7 is fixedly connected to the telescopic ends of multiple telescopic rods 23 fixedly installed on the frame 1. It can be fixed with screws. By adjusting the telescopic length of the telescopic rods 23, the distance between the two side guide plates 7 can be adjusted to adapt to the conveying needs of different widths of rice and flour products, ensuring that they remain in the center position during the conveying process. The telescopic rods 23 can be electric push rods or hydraulic rods, etc.

[0029] In specific implementation, the frame 1 is equipped with a cooling component to quickly cool and shape the rice and flour food during transportation, to prevent the surface from softening and sticking due to excessive temperature, and also to prevent water vapor from condensing after packaging due to excessive temperature, causing condensation on the inner wall of the packaging, which would affect the product's appearance and shelf life. The cooling assembly includes: A cooling plate 11 is arranged along the conveying direction. The cooling plate 11 is located inside the drive belt 4. The cooling plate 11 has a cooling channel inside. A plurality of air outlet holes 26 communicating with the cooling channel are evenly opened on the upper surface of the cooling plate 11. A first air inlet pipe 13 is connected at one end to the cooling plate 11 and communicates with the cooling channel. The other end of the first air inlet pipe 13 is connected to an external cooling air source. A regulating valve is installed on the first air inlet pipe 13, which can control the cooling air flow rate. The cooling gas enters the cooling channel through the first air inlet pipe 13 and is evenly sprayed out from the air outlet 26 to cool the rice and flour products. Preferably, the air outlets 26 of the cooling plate 11 are arranged in a matrix to ensure uniform distribution of cold air and improve cooling efficiency.

[0030] The cooling plate 11 is located above the powder spraying pipe 16. Its lower surface can also block the flour from rising and reduce dust dispersion. At the same time, it changes the airflow direction and promotes the adhesion of flour to the surface of the support rod 5, realizing functional integration and space optimization. The flour hopper 2 has a feed port on its side wall for replenishing flour. A sealing cover is installed at the feed port to prevent external impurities from entering. The bottom of the flour hopper 2 is inclined to facilitate the flour to slide to the powder suction hole 21.

[0031] Furthermore, the cooling assembly also includes two adjusting plates 12. These two adjusting plates 12 are movably inserted into the cooling channels of the cooling plate 11 from both side walls. The adjusting plates 12 are fixedly connected to adjacent side guide plates 7 via connecting rods 25. When the spacing between the side guide plates 7 is adjusted, the connecting rods 25 move, thereby driving the adjusting plates 12 to synchronously change their insertion depth within the cooling channels. This adjusts the area of ​​the air outlet 26, allowing the cooling airflow to adaptively adjust with changes in the width of the rice / flour food product, ensuring that the cold air is concentrated on the area covered by the rice / flour food product and reducing edge airflow loss. When the product width narrows, the adjusting plates 12 extend deeper into the cooling channels, blocking the outer air outlet 26 and reducing the effective air outlet area; when the product widens, the adjusting plates 12 retract, expanding the air outlet range. The entire cooling process is completed during continuous conveying. The cooling intensity can be matched to the production cycle and ambient temperature by adjusting the cooling air source pressure, ensuring stable product shaping, a dry surface without condensation, and improving the adaptability and efficiency of subsequent packaging processes.

[0032] Preferably, the conveying assembly is provided with multiple baffles 8 at intervals. The multiple baffles 8 move synchronously with the drive belt 4 to separate and position the rice and flour products, preventing them from shifting or stacking during the conveying process. The baffles 8 are arranged vertically along the conveying direction. The baffles 8 are rotatably connected to a support rod 5. A connecting plate 14 is fixed to the back of the baffles 8. The connecting plate 14 is connected to another support rod 5 through an elastic rope 15.

[0033] Furthermore, the baffle 8 is a telescopic structure with an adjustable length to accommodate the conveying needs of different sized rice and noodle products.

[0034] In this embodiment, to further prevent the rice and flour products from sticking to the support rods 5, multiple support rods 5 on the front side of the baffle 8 are respectively mounted on the drive belt 4 via mounting sleeves. The mounting sleeves are rotatably connected to the drive belt 4, and the inner diameter of the mounting sleeves is larger than the outer diameter of the support rods 5. The mounting sleeves and support rods 5 are connected by multiple circumferentially spaced connecting springs 27, so that the support rods 5 are suspended inside the mounting sleeves. A gear 9 is fixed on the mounting sleeves, and a rack 10 that meshes with the gear 9 is fixed on the frame 1 along the conveying direction. When the drive belt 4 runs, the gear 9 rolls along the rack 10, driving the mounting sleeve to rotate, which in turn drives the support rods 5 to rotate through the connecting springs 27. This causes the surface of the support rods 5 to continuously change the contact point with the rice and flour products, avoiding localized continuous friction that could cause the rice and flour products to stick or tear. At the same time, the rotational disturbance creates micro-vibrations, further reducing the risk of adhesion.

[0035] In summary, the present invention provides an automatic packaging and conveying device for rice and flour products, the working process of which is as follows: The drive unit is activated, causing the drive wheel 3 to rotate. The drive belt 4 drives multiple support rods 5 to circulate, placing the rice and flour food products on the support rods 5, which are then separated and limited by the baffle 8. The cooling air source is connected to the cooling plate 11, and the cold air is sprayed out from the matrix-arranged air outlets 26 through the cooling channels, uniformly cooling the rice and flour food products. When the product width changes, the side guide plate 7 adjusts the spacing, and the connecting rod 25 drives the adjusting plate 12 to change the insertion depth in the cooling channels, dynamically adjusting the effective area of ​​the air outlets 26 to match the cold air coverage with the product width. At the same time, the support rods 5 rotate within the mounting sleeve through the meshing of the gear 9 and the rack 10, and the slight vibration provided by the connecting spring 27 prevents the rice and flour food products from sticking to the support rods 5. When the support rods 5 move to the powder spraying area, the powder spraying device evenly sprays anti-sticking powder onto the surface of the support rods 5, further reducing the risk of rice and flour food products sticking.

[0036] It should be noted that, for the sake of simplicity, the foregoing embodiments are all described as a series of actions. However, those skilled in the art should understand that the present invention is not limited to the described order of actions, as some steps may be performed in other orders or simultaneously according to the present invention. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and modules involved are not necessarily essential to the present invention.

[0037] It should be understood that the disclosed apparatus can be implemented in other ways, as illustrated in the embodiments provided in this application. For example, the apparatus embodiments described above are merely illustrative; the division of units described above is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or communication connections shown or discussed may be through some interfaces; the indirect coupling or communication connections between devices or units may be telecommunications or other forms.

[0038] The units described above as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0039] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit the scope of protection of the invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on these embodiments, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can still combine, add, delete, or otherwise adjust the features of the various embodiments of the present invention according to the circumstances without conflict or creative effort, thereby obtaining different technical solutions that do not fundamentally depart from the concept of the present invention. These technical solutions also fall within the scope of protection of the present invention.

Claims

1. An automatic packaging and conveying device for rice and flour products, characterized in that, include: frame; The conveying assembly mounted on the frame includes a drive belt, a drive wheel for driving the drive belt, and multiple support rods spaced apart on the drive belt for conveying rice and flour products. An anti-stick component, installed within the frame and located below the conveying assembly, is used to spray flour onto the surface of the support rod. The anti-stick component is located within the flour hopper inside the frame. The anti-stick component includes: The powder spraying pipe has multiple spray holes spaced apart on its upper surface for spraying flour onto the surface of the support rod. The top end of the Venturi tube is fixedly connected to and communicates with the powder spraying pipe. Multiple powder suction holes are opened on the bottom side wall to communicate with the inside of the flour hopper. The bottom end of the Venturi tube is also connected to a second air inlet pipe, which is connected to an external air source. The flour in the flour hopper is sucked in by the Venturi effect and then sprayed out through the powder spraying pipe. The second air inlet pipe is equipped with a regulating valve to control the air intake and adjust the powder spraying concentration. The drive mechanism is used to drive the Venturi tube and the powder spraying tube to reciprocate. It is located on one side of the Venturi tube and is connected to the Venturi tube.

2. The automatic packaging and conveying device for rice and flour products as described in claim 1, characterized in that, The drive belt has two symmetrical belts, and multiple support rods are connected between the two drive belts. The first stepper motor for driving the drive wheel to rotate is fixedly installed on the frame.

3. The automatic packaging and conveying device for rice and flour products as described in claim 1, characterized in that, The bottom end of the venturi tube is hinged to the bottom of the flour silo, and the drive mechanism includes: A turntable is located on one side of the venturi tube, and a pin is eccentrically fixed on the end face of the turntable. A long groove is provided on the side wall of the venturi tube along its length for the pin to be inserted and slide. A second stepper motor is fixed to the frame, and the output shaft of the second stepper motor is fixedly connected to the turntable.

4. The automatic packaging and conveying device for rice and flour products as described in claim 1, characterized in that, The frame is symmetrically provided with side guide plates on the upper side of the conveying assembly, and multiple guide rollers are rotatably installed at intervals on the opposite surfaces of the two side guide plates.

5. The automatic packaging and conveying device for rice and flour products as described in claim 4, characterized in that, The side guide plate is fixedly connected to the telescopic ends of multiple telescopic rods fixedly installed on the frame. The telescopic rods are used to adjust the distance between the two side guide plates.

6. The automatic packaging and conveying device for rice and flour products as described in claim 5, characterized in that, A cooling assembly is mounted on the rack, the cooling assembly comprising: A cooling plate is arranged along the conveying direction. The cooling plate is located inside the drive belt. The cooling plate has a cooling channel inside. A number of air outlet holes communicating with the cooling channel are evenly opened on the upper surface of the cooling plate. A first air intake pipe is connected at one end to the cooling plate and communicates with the cooling channel, and the other end of the first air intake pipe is connected to an external cooling air source. A regulating valve is installed on the first air intake pipe.

7. The automatic packaging and conveying device for rice and flour products as described in claim 6, characterized in that, The cooling assembly also includes two adjustment plates, which are movably inserted into the cooling channels of the cooling plate from both side walls of the cooling plate. The adjustment plates are fixedly connected to the adjacent side guide plates via connecting rods.

8. The automatic packaging and conveying device for rice and flour products as described in claim 1, characterized in that, The conveying assembly is equipped with multiple baffles at intervals. The baffles are arranged vertically along the conveying direction. The baffles are rotatably connected to a support rod. A connecting plate is fixed to the back of the baffle. The connecting plate is connected to another support rod through an elastic rope. The baffles are telescopic structures.

9. The automatic packaging and conveying device for rice and flour products as described in claim 8, characterized in that, The multiple support rods on the front side of the baffle are respectively mounted on the drive belt through mounting sleeves. The mounting sleeves are rotatably connected to the drive belt. The inner diameter of the mounting sleeves is larger than the outer diameter of the support rods. The mounting sleeves and support rods are connected by multiple circumferentially spaced connecting springs, so that the support rods are suspended inside the mounting sleeves. Gears are fixed on the mounting sleeves, and racks that mesh with the gears are fixed on the frame along the conveying direction.

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