A group meal portioning device

By designing placement and stirring components, the problems of contamination caused by the lack of a fixed place for the lunch boxes and the impact of soup sedimentation on taste are solved. This enables convenient transportation of the lunch boxes and effective stirring of soup, ensuring food quality.

CN224324225UActive Publication Date: 2026-06-05SUZHOU MEINIANHUA CLOUD KITCHEN TECHNOLOGY CO LTD

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
SUZHOU MEINIANHUA CLOUD KITCHEN TECHNOLOGY CO LTD
Filing Date
2025-06-19
Publication Date
2026-06-05

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Abstract

The utility model discloses a kind of group meal meal packing device, belong to meal packing technical field, including base, conveying sealing mechanism is provided in the inside of the base, the side of base is provided with a plurality of material conveying mechanism, filling mechanism is provided between base and material conveying mechanism;The utility model sets up placing assembly, to the U-shaped frame periphery moving placing frame, placing frame moves and drives batten to move inside edge groove, then meal box is taken off from conveying sealing mechanism, and the meal box is placed to placing frame inside, then again using battery to power supply operation to electric push rod, electric push rod operation drives moving plate to move, moving plate moves and drives moving wheel to move, when moving wheel moves and sticks to ground and U-shaped frame is far away from ground, using moving wheel drives U-shaped frame to move, U-shaped frame moves and drives placing frame to move, it is convenient to realize the transfer operation of meal of packing sealing.
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Description

Technical Field

[0001] This utility model belongs to the field of food packaging technology, specifically relating to a group meal packaging device. Background Technology

[0002] Group catering, also known as group meals, refers to centralized catering services initiated by organizations or institutions for specific groups. Its core characteristic is that the consumers are groups rather than individuals, and the service format is mainly bulk production and door-to-door delivery. Service standards and operating rights are usually agreed upon through contracts.

[0003] In existing fully automated filling and packaging production lines, after food is dispensed and sealed using lunch boxes, the lunch boxes are not placed in a fixed location after being removed from the conveyor by workers. If the lunch boxes are placed anywhere, they are easily contaminated or even damaged, which can lead to food contamination or leakage. In addition, when using a soup hopper to hold soup, the soup is prone to sedimentation inside the hopper, which affects the taste of the food after filling. Utility Model Content

[0004] To address the problems mentioned in the background section, this invention provides a group meal dispensing device that is easy to store and prevents sedimentation.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a group meal packaging device, including a base, a conveying and sealing mechanism is provided inside the base, a plurality of material conveying mechanisms are provided on one side of the base, a filling mechanism is provided between the base and the material conveying mechanisms, a hopper cover is provided above the filling mechanism, a placement component is provided at one end of the base, and a stirring component is provided on the hopper cover.

[0006] Preferably, the placement component includes a U-shaped frame, placement frames, and a movable component. One end of the base is provided with a U-shaped frame, the movable component is provided inside the U-shaped frame, and several placement frames are provided inside the U-shaped frame and above the movable component.

[0007] Preferably, the movable component includes a partition, a mounting box, an electric push rod, a battery, a movable plate, and movable wheels. The partition is fixedly connected inside the U-shaped frame, the mounting box is fixedly connected below the partition, the battery is fixedly connected inside the mounting box, the electric push rod is fixedly connected inside the mounting box and below the battery, the movable plate is fixedly connected to the output end of the electric push rod, and movable wheels are fixedly connected to both ends of the lower part of the movable plate.

[0008] Preferably, the placement component further includes side strips and side grooves. Side strips are fixedly connected to both sides of the placement frame, and side grooves are provided on the inner side wall of the U-shaped frame at the positions corresponding to the side strips.

[0009] Preferably, the stirring assembly includes stirring rods, a drive motor, a drive wheel, a rotating rod, and a driven wheel. The drive motor is fixedly connected to the top of the hopper cover, and the drive wheel is fixedly connected to the output end of the drive motor. A rotating rod is rotatably connected to both ends of the drive wheel on the side wall of the hopper cover. A driven wheel is fixedly connected to the outer side wall of the rotating rod at the position corresponding to the drive wheel. Several stirring rods are fixedly connected to the end of the rotating rod away from the hopper cover.

[0010] Preferably, a protective box is fixedly connected below the hopper cover and around the drive motor and driven wheel, and a round hole is provided on the protective box at the position corresponding to the rotating rod.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] 1. This utility model is equipped with a placement component. The placement frame moves to the outside of the U-shaped frame. The movement of the placement frame causes the side strip to move inside the side groove. Then, the packaged and sealed lunch box is removed from the conveying and sealing mechanism and placed inside the placement frame. Then, the electric push rod is powered by a battery. The electric push rod moves the moving plate, which in turn moves the moving wheels. When the moving wheels move and touch the ground and the U-shaped frame moves away from the ground, the moving wheels drive the U-shaped frame to move. The movement of the U-shaped frame drives the placement frame to move, which facilitates the transfer of packaged and sealed food.

[0013] 2. This utility model is equipped with a stirring component. After the broth is injected into the filling mechanism, the drive motor above the hopper cover is started. The drive motor drives the drive wheel to rotate, which in turn drives the driven wheel to rotate. The driven wheel then drives the rotating rod to rotate, which in turn drives the stirring rod to rotate. During the rotation of the stirring rod, the broth inside the filling mechanism is stirred and mixed, preventing the broth from settling and affecting the taste of the subsequently packaged food. During the stirring process, the protective box prevents the broth from splashing onto the drive and driven wheels, thus preventing corrosion and ensuring the normal service life of the drive and driven wheels. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a structural diagram showing the connection between the U-shaped frame and the placement frame of this utility model;

[0016] Figure 3 This is a cross-sectional view of the partition of this utility model;

[0017] Figure 4 This is a cross-sectional view of the hopper cover of this utility model.

[0018] In the diagram: 1. Conveying mechanism; 2. Placement component; 21. U-shaped frame; 22. Placement frame; 23. Side strip; 24. Side groove; 25. Moving part; 251. Partition plate; 252. Mounting box; 253. Electric push rod; 254. Battery; 255. Moving plate; 256. Moving wheel; 3. Base; 4. Conveying and sealing mechanism; 5. Filling component; 6. Hopper cover; 7. Mixing component; 71. Protective box; 72. Mixing rod; 73. Drive motor; 74. Drive wheel; 75. Rotating rod; 76. Driven wheel. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Example 1

[0021] Please see Figure 1-4 The present invention provides the following technical solution: a group meal packaging device, including a base 3, a conveying and sealing mechanism 4 is provided inside the base 3, a plurality of material conveying mechanisms 1 are provided on one side of the base 3, a filling mechanism 5 is provided between the base 3 and the material conveying mechanisms 1, a hopper cover 6 is provided above the filling mechanism 5, a placement component 2 is provided at one end of the base 3, and a stirring component 7 is provided on the hopper cover 6.

[0022] Specifically, the placement component 2 includes a U-shaped frame 21, placement frames 22, and movable parts 25. A U-shaped frame 21 is provided at one end of the base 3. Movable parts 25 are disposed inside the U-shaped frame 21. Several placement frames 22 are disposed inside the U-shaped frame 21 and above the movable parts 25.

[0023] By adopting the above technical solution, after the packaged and sealed food is taken off from the conveying and sealing mechanism 4, the food is placed on the placement frame 22 for storage. When enough food is placed on the placement frame 22, the moving part 25 drives the U-shaped frame 21 to move. The movement of the U-shaped frame 21 drives the placement frame 22 to move, which facilitates the transfer operation of the packaged and sealed food.

[0024] Specifically, the movable component 25 includes a partition 251, a mounting box 252, an electric push rod 253, a battery 254, a movable plate 255, and movable wheels 256. The partition 251 is fixedly connected inside the U-shaped frame 21. The mounting box 252 is fixedly connected below the partition 251. The battery 254 is fixedly connected inside the mounting box 252. The electric push rod 253 is fixedly connected inside the mounting box 252 and below the battery 254. The movable plate 255 is fixedly connected to the output end of the electric push rod 253. Movable wheels 256 are fixedly connected to both ends of the lower part of the movable plate 255.

[0025] By adopting the above technical solution, the battery 254 is used to power the electric push rod 253, and the electric push rod 253 drives the moving plate 255 to move. The moving plate 255 drives the moving wheel 256 to move. When the moving wheel 256 moves to contact the ground and the U-shaped frame 21 moves away from the ground, the moving wheel 256 drives the U-shaped frame 21 to move, which makes it convenient for the operator to move the U-shaped frame 21.

[0026] Specifically, the placement component 2 also includes side strips 23 and side grooves 24. Side strips 23 are fixedly connected to both sides of the placement frame 22, and side grooves 24 are provided on the inner side wall of the U-shaped frame 21 at positions corresponding to the side strips 23.

[0027] By adopting the above technical solution, after the food is placed inside the placement frame 22, the placement frame 22 is moved to the outside of the U-shaped frame 21. The movement of the placement frame 22 causes the side strip 23 to move inside the side groove 24. With the cooperation of the side strip 23 and the side groove 24, the movement of the placement frame 22 can be guided. When the placement frame 22 moves out of the U-shaped frame 21, the food is then placed at the end of the placement frame 22 that is close to the U-shaped frame 21, which makes it easier for the operator to place the food inside the placement frame 22.

[0028] In this embodiment, during the group meal packaging process, different foods and broths are first placed into the conveying mechanism 1 and filling mechanism 5 respectively. Then, the meal box is placed onto the conveying and sealing mechanism 4. The conveying and sealing mechanism 4 moves the meal box. When the meal box moves to different positions of the conveying mechanism 1 and filling mechanism 5, the conveying mechanism 1 and filling mechanism 5 inject food and broth into the meal box. After the food is packaged, the conveying and sealing mechanism 4 seals the meal box. Then, the bottom placement frame 22 moves towards the outside of the U-shaped frame 21. The movement of the placement frame 22 causes the side strip 23 to move inside the side groove 24. Finally, the meal box is removed from the conveying and sealing mechanism 4. The sealed lunch boxes are placed inside the placement frame 22. After enough lunch boxes are placed on the bottom placement frame 22, the removed lunch boxes are placed in the middle and top placement frames 22 in sequence. Then, the battery 254 powers the electric push rod 253. The electric push rod 253 moves the moving plate 255, which in turn moves the moving wheel 256. When the moving wheel 256 moves to the ground and the U-shaped frame 21 moves away from the ground, the moving wheel 256 moves the U-shaped frame 21, which in turn moves the placement frame 22, facilitating the transfer of the packaged and sealed meals.

[0029] Example 2

[0030] The difference between this embodiment and Embodiment 1 is that the stirring assembly 7 includes stirring rods 72, a drive motor 73, a driving wheel 74, a rotating rod 75, and a driven wheel 76. The drive motor 73 is fixedly connected to the top of the hopper cover 6, and the driving wheel 74 is fixedly connected to the output end of the drive motor 73. A rotating rod 75 is rotatably connected to both ends of the driving wheel 74 on the side wall of the hopper cover 6. A driven wheel 76 is fixedly connected to the outer side wall of the rotating rod 75 at the position corresponding to the driving wheel 74. Several stirring rods 72 are fixedly connected to the end of the rotating rod 75 away from the hopper cover 6.

[0031] Specifically, a protective box 71 is fixedly connected below the hopper cover 6 and around the drive motor 73 and driven wheel 76. A round hole is provided on the protective box 71 at the position corresponding to the rotating rod 75.

[0032] By adopting the above technical solution, during the process of stirring the soup inside the filling mechanism 5 using the stirring rod 72, the protective box 71 can prevent the soup from splashing onto the driving wheel 74 and the driven wheel 76, thus preventing corrosion of the driving wheel 74 and the driven wheel 76 and ensuring the normal service life of the driving wheel 74 and the driven wheel 76.

[0033] In this embodiment, after the broth is injected into the filling mechanism 5, the drive motor 73 above the hopper cover 6 is started. The drive motor 73 drives the drive wheel 74 to rotate, which in turn drives the driven wheel 76 to rotate. The driven wheel 76 then drives the rotating rod 75 to rotate, which in turn drives the stirring rod 72 to rotate. During the rotation of the stirring rod 72, the broth inside the filling mechanism 5 can be stirred and mixed to prevent the broth from settling and affecting the taste of the subsequently packaged food. During the stirring process, the protective box 71 prevents the broth from splashing onto the drive wheel 74 and the driven wheel 76, thus preventing them from rusting and ensuring their normal service life.

[0034] In this utility model, the electric push rod 253 is a previously disclosed technology, and the selected model is BST-YF-B.

[0035] In this utility model, the drive motor 73 is a previously disclosed technology, and the selected model is HYSF666.

[0036] The structure and principle of the conveying mechanism 1, which consists of a single-bucket lifting feeder, a feeding hopper, a conveying hopper, a temporary storage hopper, a weighing hopper, a buffer hopper, a batching device, a transverse track, a support frame, a lifting feeding pipe, a material flattener, a pressing plate, a lifting rod, and a frame, have been disclosed in the fully automatic filling and packaging production line device disclosed in 202321141172.1. Its working principle is as follows: A single-bucket lifting feeder and a weighing feeding tank are provided on one side of the conveying and sealing mechanism 4. The single-bucket lifting feeder includes a frame, on which a feeding hopper is movably installed. The feeding hopper is poweredly connected to the lifting device. The output end of the feeding hopper is connected to the conveying hopper when the feeding hopper is placed on the upper part of the frame. The conveying hopper is connected to the weighing feeding tank, which includes a temporary storage hopper and multiple weighing hoppers. The temporary storage hopper is placed on top of the weighing hopper and is connected to the multiple weighing hoppers respectively. All weighing hoppers are connected to the buffer hopper. A valve body is installed on the discharge end of the temporary storage hopper, the weighing hopper, and the buffer hopper. A feeder is also provided below the buffer hopper. The feeder needs to be movably installed on the transverse track. The transverse track is installed across the top of the conveying sealing mechanism 4. At the same time, a feeding device is also installed across the top of the corresponding position of the conveying sealing mechanism 4. The feeding support frame is equipped with multiple parallel lifting feeding pipes, each connected to a dispensing device. Multiple material flatteners are added to the support frame, the number matching the number of lifting feeding pipes. Each material flattener includes a pressing plate and a lifting rod. The pressing plate is installed at the bottom of the lifting rod, with its descent position corresponding to the feeding position of the lifting feeding pipes. The food ingredients are poured into the feeding hopper, automatically lifted, and evenly fed into the temporary storage hopper via a horizontal screw. When the weighing hopper is empty, the temporary storage hopper opens, and the food falls into the weighing hopper. High-speed weighing is performed. After the control system calculates the required weight, multiple weighing hoppers are opened simultaneously. The weighed and combined dishes fall into the weighing material buffer hopper. When the servo-driven high-speed feeder moves below the weighing material buffer hopper, the hopper opens, and the dishes fall into the feeder. When the lifting feeding pipe is inserted into the corresponding food container compartment, the dishes are sequentially fed into each feeding pipe and fall into the food container compartment through the high-speed movement of the feeder. After high-speed feeding is completed, the material flattener flattens the material, and the lifting feeding pipe rises, completing the entire feeding process.

[0037] The structure and principle of the conveying and sealing mechanism 4, which consists of a conveying table, positioning push rods, a servo motor, a sealing and packaging station, a guide rail, a film coating shaft, a waste film collection shaft, a vacuum sealing and cutting module, an upper mold, a lower mold, a heat transfer coding machine, a lateral displacement device, a film pre-tensioning device, and a film sealing and cutting assembly, have been disclosed in the fully automatic filling and packaging production line device disclosed in 202321141172.1. Its working principle is as follows: a conveying table is set inside the base 3, and multiple lateral positioning push rods are designed on the conveying table. The positioning push rods are connected to the servo motor via chains. A sealing and packaging station is located at one end of the conveyor table. This station includes a horizontally mounted film-coating shaft and a waste film collection shaft. A vacuum sealing and cutting module is installed between the film-coating shaft and the waste film collection shaft, positioned above the sealing and packaging station. The film-coating shaft allows the sealing film to be cut by the vacuum sealing and cutting module, after which the waste film is wound onto the waste film collection shaft. The vacuum sealing and cutting module includes an upper mold and a lower mold. The lower mold is mounted on a lifting device installed on the conveyor table. On the surface, a film sealing and cutting assembly is installed on the upper mold. Behind the vacuum sealing and cutting module, a heat transfer coding machine is also installed. This heat transfer coding machine is mounted on a transverse displacement device. A film pre-tensioning device is added between the film coating shaft and the waste film collection shaft, and the installation position of this film pre-tensioning device must be close to the aforementioned film coating shaft 501. When the lunchbox is placed on the conveyor table, under the action of the servo motor, multiple positioning push rods can be driven by a chain to move back and forth in a step-like manner on the conveyor table, thereby pushing the lunchbox on the conveyor table step-like towards... The process begins with the lower mold rising as the qualified lunchboxes reach the sealing station. The lunchboxes automatically enter the lower mold, and after it closes with the upper mold, a vacuum process begins, creating a vacuum in the cavity between the upper and lower molds. The lower mold then rises again, heat-sealing the lunchboxes and sealing film while simultaneously depressurizing the vacuum cavity. Once heat sealing is complete and the vacuum chamber pressure is released, the lower mold descends to its reset position. Simultaneously, the waste film collection shaft rewinds the cut sealing film, and the laminating shaft releases new sealing film. A color mark detection sensor then precisely aligns the printed sealing film pattern with the lunchbox position before stopping the film traction. At this point, the heat transfer coding machine immediately begins printing the first two positions. After printing, the coding machine's shifting device prints the second two positions, completing one vacuum sealing operation.

[0038] The structure and principle of the filling mechanism 5, which consists of a soup hopper, a discharge nozzle, a quantitative filling machine, a lifting support, a liquid level sensor, a self-cleaning pipe, a soup inlet valve, a feeding pipe, and a self-cleaning valve, have been disclosed in the fully automatic filling and packaging production line device disclosed in 202321141172.1. Its working principle is as follows: A soup hopper is provided on one side of the base 3. This soup hopper is connected to its respective discharge nozzle through multiple pipes. All multiple pipes pass through the quantitative filling machine, which is used to quantitatively output soup to the discharge nozzle. The discharge nozzles are installed side-by-side on the support, which can be a lifting support. The lifting support is installed across both sides of the conveying and sealing mechanism 4. The soup hopper is also connected to the feeding pipe, and the feeding pipe can be directly connected to an external power supply. The material source is connected, and a soup feed valve is installed in the feed pipe. A liquid level sensor is installed on the soup hopper, and both the liquid level sensor and the soup feed valve are connected to the control system. The feed pipe is connected to a self-cleaning pipe, and the soup feed valve is located at the rear end of the connection point of the self-cleaning pipe. A self-cleaning valve is also installed on the self-cleaning pipe, which must be connected to an external clean water source. When the self-cleaning valve is opened, the clean water source can be used to flush the feed pipe and the inside of the soup hopper. The processed soup material is then fed into a sanitary diaphragm pump feeder. When the liquid level in the soup hopper is low, the soup feed valve is opened, and the diaphragm pump feeder sends the soup into the soup hopper. When the soup reaches the set liquid level, the soup feed valve is closed, and the diaphragm pump feeder automatically stops. When soup filling is required, the anti-drip nozzle descends and inserts into the food container compartment and opens. The four sets of high-precision liquid filling pump heads of the quantitative filling machine begin to rotate and feed the soup into the food container compartment in a quantitative manner. At the same time, the food container sealing edge covers the food container to prevent the soup from splashing into other compartments or contaminating the sealing surface, thus affecting the sealing quality. When filling is completed, the nozzle rises and closes, thus completing one soup filling operation.

[0039] The working principle and usage process of this utility model are as follows: During the group meal packaging process, different foods and soups are first placed into the conveying mechanism 1 and the filling mechanism 5 respectively. The drive motor 73 above the hopper cover 6 is started. The drive motor 73 drives the drive wheel 74 to rotate, which in turn drives the driven wheel 76 to rotate. The driven wheel 76 then drives the rotating rod 75 to rotate, which in turn drives the stirring rod 72 to rotate. During the rotation of the stirring rod 72, the soup inside the filling mechanism 5 is stirred and mixed to prevent sedimentation, which would affect the taste of the packaged meals. During the stirring process, the protective box 71 prevents soup from splashing onto the drive wheel 74 and the driven wheel 76, thus preventing corrosion and ensuring their normal service life. Then, the meal box is placed on the conveying and sealing mechanism 4, which moves the meal box. As the meal box moves to different positions on the conveying mechanism 1 and the filling mechanism 5... During the process, food and broth are injected into the lunch box using the feeding mechanism 1 and the filling mechanism 5. After the food is packaged, the lunch box is sealed using the conveying and sealing mechanism 4. Then, the bottom placement frame 22 moves to the outside of the U-shaped frame 21. The movement of the placement frame 22 causes the side strip 23 to move inside the side groove 24. The packaged and sealed lunch box is then removed from the conveying and sealing mechanism 4 and placed inside the placement frame 22. After a sufficient number of lunch boxes are placed on the bottom placement frame 22, the removed lunch boxes are then... The food is placed sequentially into the middle and top placement frames 22. Then, the battery 254 powers the electric push rod 253. The electric push rod 253 moves the moving plate 255, which in turn moves the moving wheel 256. When the moving wheel 256 moves to contact the ground and the U-shaped frame 21 moves away from the ground, the moving wheel 256 moves the U-shaped frame 21. The movement of the U-shaped frame 21 moves the placement frame 22, facilitating the transfer of the packaged and sealed food.

[0040] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A group meal dispensing device, comprising a base (3), wherein a conveying and sealing mechanism (4) is provided inside the base (3), a plurality of conveying mechanisms (1) are provided on one side of the base (3), a filling mechanism (5) is provided between the base (3) and the conveying mechanisms (1), and a hopper cover (6) is provided above the filling mechanism (5), characterized in that: A placement component (2) is provided at one end of the base (3), and a stirring component (7) is provided on the hopper cover (6).

2. The group meal dispensing device according to claim 1, characterized in that: The placement component (2) includes a U-shaped frame (21), a placement frame (22) and a movable component (25). A U-shaped frame (21) is provided at one end of the base (3). A movable component (25) is provided inside the U-shaped frame (21). Several placement frames (22) are provided inside the U-shaped frame (21) and above the movable component (25).

3. The group meal dispensing device according to claim 2, characterized in that: The movable component (25) includes a partition (251), a mounting box (252), an electric push rod (253), a battery (254), a movable plate (255), and movable wheels (256). The partition (251) is fixedly connected inside the U-shaped frame (21). The mounting box (252) is fixedly connected below the partition (251). The battery (254) is fixedly connected inside the mounting box (252). The electric push rod (253) is fixedly connected inside the mounting box (252) and below the battery (254). The movable plate (255) is fixedly connected to the output end of the electric push rod (253). Movable wheels (256) are fixedly connected to both ends of the lower part of the movable plate (255).

4. A group meal dispensing device according to claim 2, characterized in that: The placement component (2) also includes a side strip (23) and a side groove (24). The side strip (23) is fixedly connected to both sides of the placement frame (22), and the side groove (24) is provided on the inner side wall of the U-shaped frame (21) at the position corresponding to the side strip (23).

5. A group meal dispensing device according to claim 1, characterized in that: The stirring assembly (7) includes stirring rods (72), a drive motor (73), a drive wheel (74), a rotating rod (75), and a driven wheel (76). The drive motor (73) is fixedly connected to the top of the hopper cover (6). The output end of the drive motor (73) is fixedly connected to the drive wheel (74). The rotating rods (75) are rotatably connected to both ends of the drive wheel (74) on the side wall of the hopper cover (6). The driven wheel (76) is fixedly connected to the outer side wall of the rotating rod (75) at the position corresponding to the drive wheel (74). Several stirring rods (72) are fixedly connected to the end of the rotating rod (75) away from the hopper cover (6).

6. A group meal dispensing device according to claim 5, characterized in that: A protective box (71) is fixedly connected below the hopper cover (6) and around the drive motor (73) and driven wheel (76). A round hole is provided on the protective box (71) at the position corresponding to the rotating rod (75).