A canteen meal preservation sample cabinet

Abstract

The utility model discloses a meal preservation and sample keeping cabinet for mess hall, including fresh -keeping cabinet, the fixed block is equipped with in fresh -keeping cabinet inside, the fixed block top slides and is equipped with the rack, the rack outside is equipped with the clamping sleeve, the fixed block one side is equipped with the clamping rod, the clamping sleeve outside rotationally is equipped with the control sleeve, the clamping sleeve outside rotationally is equipped with the rotating plate, the control sleeve inside is equipped with the reducing groove, the reducing groove in the sliding is equipped with the reducing plate, the rotating plate is equipped with the rotating groove, and the rotating groove one end is equipped with the rotating hole, the clamping sleeve outside slidingly is equipped with the push sleeve, and the push sleeve one side is equipped with the support rod, and the support rod is equipped with the support plate, and the control sleeve one side is equipped with the rotating frame, and the rotating frame in the sliding is equipped with the limiting rod, and the limiting rod one end is equipped with the limiting plate, and the clamping sleeve outside is equipped with the limiting slot, and the clamping rod outside is equipped with the clamping groove, and the reducing plate one side is equipped with the clamping block, the utility model discloses has realized the convenient disassembly of rack, thereby has realized the convenient adjustment of rack installation quantity and installation position, has guaranteed the installation stability of rack simultaneously.

Description

Technical Field

[0001] This utility model relates to the technical field of food preservation and sample retention cabinets, and more specifically, it relates to a food preservation and sample retention cabinet for canteens. Background Technology

[0002] Food sample preservation cabinets, as crucial equipment in the food safety supervision system, are widely used in various collective dining venues such as school canteens, corporate restaurants, hospital nutrition departments, and social catering enterprises. They bear key responsibilities including food sample preservation, food safety traceability, and investigation and evidence collection in food poisoning incidents. They are indispensable professional equipment for ensuring public food safety. Current technology typically requires multiple racks within the sample preservation cabinet to hold different types of food sample containers, allowing for orderly placement of categorized samples and ensuring each sample is preserved for the prescribed time under suitable environmental conditions. However, the racks are usually simply placed inside the cabinet in a primitive manner, lacking effective fixing and positioning mechanisms. They rely solely on their own weight and simple contact with the cabinet's inner wall for stability. This rudimentary placement method exposes serious safety hazards in actual use: when staff open the cabinet door to retrieve or place sample containers, the vibrations and impacts generated by the operation easily cause the racks to break. Accidental sliding or tilting, or even complete sliding to the bottom of the cabinet, can damage not only the racks themselves and the inner walls of the cabinet, but more seriously, it can cause the sample containers placed on the racks to tip over and break, resulting in spillage and cross-contamination of the sampled food, affecting the effectiveness and accuracy of the sampling. In addition, while some fixed installation structures have solved the problem of racks slipping to some extent, this rigid installation method brings new drawbacks: once the number and position of the racks are determined, they cannot be adjusted according to actual needs. When there are many types of food to be sampled, a fixed number of racks may not meet the needs; when taller sample containers need to be placed, fixed rack positions may lead to unreasonable space utilization and fail to optimize the configuration of the cabinet space. This lack of flexibility severely limits the practicality and adaptability of the sample retention cabinet, making it impossible to flexibly adjust the number and position of the racks, and failing to adapt to the diverse actual needs of different-sized canteens, different types of dishes at different times, and different container sizes.

[0003] Secondly, in order to overcome the dual shortcomings of traditional placement racks—simple placement leading to easy slippage and fixed installation lacking flexibility—some devices, while achieving convenient fixing and removal of the racks through simple structures, suffer from simplistic structures, relatively crude design concepts, low stability, and obvious technical defects and safety risks. These simplified fixing structures typically only consider basic fixing requirements under static conditions, failing to fully consider the complexity and special requirements of the actual usage environment of the canteen sample retention cabinet: opening and closing the cabinet door generates airflow impact and vibration transmission; the varying force and angle of operation by staff when handling sample containers may exert external forces of different directions and magnitudes on the rack; and the weight distribution of the sample containers themselves... Changes in quantity and type can also affect the stress state of the placement rack. Under these complex and variable usage conditions, simple fixing mechanisms often cannot provide sufficient connection strength and are prone to loosening or even falling off due to other external forces. Loosening of the fixing structure can not only cause the placement rack to shift position, affecting the stable placement of the sample container, but may also lead to a decrease in the load-bearing capacity of the placement rack. More seriously, when the fixing structure completely falls off, the placement rack may suddenly lose support and fall, which may not only damage the placement rack and sample container, but also cause accidental injury to the staff who are operating it, and may even damage the refrigeration equipment or temperature sensors and other precision components inside the sample retention cabinet, affecting the normal function of the entire sample retention cabinet. Utility Model Content

[0004] (a) Technical problems to be solved In view of the problems existing in the prior art, this utility model provides a food preservation and sample retention cabinet for canteen meals to solve the technical problems mentioned in the background art.

[0005] (II) Technical Solution To achieve the above objectives, this utility model provides the following technical solution: a food preservation and sample retention cabinet for canteens, comprising a preservation cabinet, a fixing block fixedly disposed inside the preservation cabinet, a placement rack slidably disposed above the fixing block, a detachable sleeve disposed outside the placement rack, a locking rod fixedly disposed on one side of the fixing block, the sleeve detachably sleeved on the outside of the locking rod, a control sleeve rotatably sleeved on the outside of the sleeve, a rotating plate rotatably disposed on the outside of the sleeve, a variable diameter groove opened on the inner side of the control sleeve, a variable diameter plate slidably disposed in the variable diameter groove, and an opening on the rotating plate. The device is provided with a rotating groove, one end of which has a rotating hole. A push sleeve is slidably fitted on the outside of the sleeve. A support rod is fixedly connected to one side of the push sleeve. A support plate is fixedly installed on the support rod. The support plate has two locations. A rotating frame is fixedly installed on one side of the control sleeve. A limiting rod is slidably installed in the rotating frame. A limiting plate is connected to one end of the limiting rod. A limiting groove is opened on the outside of the sleeve. One end of the limiting rod is inserted into the limiting groove. A slot is opened on the outside of the locking rod. A locking block is fixedly connected to one side of the variable diameter plate. The locking block is locked into the slot.

[0006] The present invention is further configured such that a cabinet door is rotatably provided on one side of the refrigerator, and a handle is fixedly provided on the outside of the cabinet door.

[0007] The present invention is further provided that the cabinet door is detachably provided with an observation window, which is made of transparent material.

[0008] The present invention is further configured such that the placement rack has multiple through slots.

[0009] The present invention is further configured such that a movable spring is connected to one side of the push sleeve, the movable spring is movably sleeved on the outside of the support rod, and the other end of the movable spring is in contact with the rotating plate.

[0010] The present invention is further configured such that a connecting spring is movably sleeved on the outer side of the limiting rod, and the two ends of the connecting spring are respectively connected to the limiting plate and the rotating frame.

[0011] The present invention is further configured such that one end of the limiting rod and the edge of the inner wall of the limiting groove are both designed with rounded corners.

[0012] The present invention is further configured such that the slot is formed in a ring structure and is located on the outside of the card rod.

[0013] (III) Beneficial Effects Compared with the prior art, this utility model provides a food preservation and sample retention cabinet for canteen meals, which has the following beneficial effects: 1. By fixing a block inside the refrigerated display case and designing a sliding rack structure above the block, combined with a detachable sleeve on the outside and a clamping rod fixed to one side of the block, this design effectively solves the problems of simple placement racks that easily slip off or the lack of flexibility in fixed installations in existing refrigerated sample storage cabinets. Users can rotate the control sleeve in the forward direction to slide the variable diameter plate in the variable diameter groove, causing the block to disengage from the groove, ultimately achieving complete removal of the sleeve from the outside of the clamping rod. This design allows staff to flexibly adjust the number and position of the racks according to actual needs, such as the variety of vegetables to be sampled. As the number of food items increases, the number of racks can be increased. When taller sample containers need to be placed, the spacing between the racks can be adjusted to fully optimize the utilization of the cabinet space. This adapts to the diverse practical needs of different-sized canteens, changes in the types of dishes at different times, and different container sizes, significantly improving the practicality and adaptability of the refrigerated sample storage cabinet. At the same time, the multiple through-slots on the racks ensure sufficient circulation of cold air, guaranteeing that each sample can be stored in a suitable environment for the specified time. The transparent observation window on the cabinet door allows staff to observe the internal conditions without opening the door, improving the ease of use of the equipment.

[0014] 2. Through the cooperation of the control sleeve, rotating frame, limiting rod, limiting plate, and connecting spring, as well as the cooperation of the rotating plate, push sleeve, support rod, support plate, and movable spring, a complete safety guarantee system is formed, effectively solving the problem of low stability of existing simplified structure fixing mechanisms. After the placement frame is installed and the locking block is re-engaged in the slot, the limiting rod will re-insert into the original limiting slot under the action of the connecting spring. Then, by rotating the rotating plate in the forward direction to make the rotating hole concentric with the support plate, the movable spring pushes the push sleeve to drive the support rod and support plate to reset. Finally, rotating the rotating plate in the reverse direction makes the rotating hole and rotating slot not aligned with the support rod, forming a support and limiting mechanism for the rotating plate by the support rod and support plate, ensuring that the push sleeve cannot slide and restricting the limiting plate, preventing the limiting rod from disengaging from the limiting slot, thereby locking the entire device. This multi-locking structure... The design fully considers the complexity of the actual usage environment of the canteen sample retention cabinet. It can effectively resist the airflow impact and vibration transmission generated by opening and closing the cabinet door, withstand the different forces and angles of operation when staff take out and put in the sample containers, and the stress effect of changes in the weight distribution and quantity of sample containers on the placement rack. This enhances the structural stability and operational reliability of the entire fixing mechanism, effectively avoiding safety hazards such as placement rack position displacement, reduced load-bearing capacity, or even sudden falls caused by loosening or even falling off of the fixing structure. It also prevents sample containers from tipping over, breaking, spilling of sample food, and cross-contamination caused by unstable placement racks, ensuring the effectiveness and accuracy of sample retention. At the same time, it protects the safety of staff and the precision components inside the cabinet from damage, improving the functional integrity and service life of the entire sample retention cabinet. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of a food preservation and sample retention cabinet for canteen meals according to this utility model. Figure 2 This is a schematic diagram of the dispersed structure of the placement rack and card sleeve in this utility model; Figure 3 This is a schematic diagram of the dispersed structure of the rotating plate, push sleeve, clamp sleeve, control sleeve, and clamp rod in this utility model; Figure 4 This is a cross-sectional structural diagram of the rotating plate, push sleeve, clamp sleeve, control sleeve, and clamp rod in this utility model. Figure 5 This is a schematic diagram of the dispersed structure of the push sleeve and control sleeve in this utility model.

[0016] In the diagram: 1. Refrigerated display case; 2. Fixing block; 3. Shelf; 4. Sleeve; 5. Locking rod; 6. Control sleeve; 7. Rotating plate; 8. Variable diameter groove; 9. Variable diameter plate; 10. Rotating groove; 11. Rotating hole; 12. Push sleeve; 13. Support rod; 14. Support plate; 15. Rotating frame; 16. Limiting rod; 17. Limiting plate; 18. Limiting groove; 19. Slot; 20. Locking block; 21. Cabinet door; 22. Handle; 23. Observation window; 24. Through groove; 25. Movable spring; 26. Connecting spring. Detailed Implementation

[0017] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0018] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0019] In this utility model, unless otherwise stated, the directional terms such as "up" and "down" usually refer to the direction shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" usually refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0020] Please see Figures 1-5 A food preservation and sample retention cabinet for canteens includes a preservation cabinet 1. A fixing block 2 is fixedly installed inside the preservation cabinet 1. A placement rack 3 is slidably installed above the fixing block 2. A detachable sleeve 4 is installed on the outside of the placement rack 3. A locking rod 5 is fixedly installed on one side of the fixing block 2. The sleeve 4 is detachably fitted onto the outside of the locking rod 5. A control sleeve 6 is rotatably fitted onto the outside of the sleeve 4. A rotating plate 7 is rotatably installed on the outside of the sleeve 4. A diameter-changing groove 8 is opened on the inner side of the control sleeve 6. A diameter-changing plate 9 is slidably installed in the diameter-changing groove 8. A rotating groove 10 is opened on the rotating plate 7. A rotating hole is opened at one end of the rotating groove 10. 11. A push sleeve 12 is slidably fitted on the outer side of the sleeve 4. A support rod 13 is fixedly connected to one side of the push sleeve 12. A support plate 14 is fixedly installed on the support rod 13. The support plate 14 has two locations. A rotating frame 15 is fixedly installed on one side of the control sleeve 6. A limiting rod 16 is slidably installed in the rotating frame 15. A limiting plate 17 is connected to one end of the limiting rod 16. A limiting groove 18 is opened on the outer side of the sleeve 4. One end of the limiting rod 16 is inserted into the limiting groove 18. A slot 19 is opened on the outer side of the locking rod 5. A locking block 20 is fixedly connected to one side of the variable diameter plate 9. The locking block 20 is inserted into the slot 19.

[0021] The refrigerator 1 has a door 21 that rotates on one side, and a handle 22 is fixed on the outside of the door 21.

[0022] The cabinet door 21 is detachably equipped with an observation window 23, which is made of transparent material. The placement rack 3 has multiple through slots 24.

[0023] In this embodiment, when the device is needed, the cabinet door 21 is first opened by the handle 22, and then the number and position of the racks 3 are adjusted according to the usage requirements. Then, the food that needs to be preserved and sampled is placed on the corresponding rack 3, and then the cabinet door 21 is closed. The observation window 23 is set so that the staff can observe the inside of the refrigerator 1 without opening the cabinet door 21.

[0024] Please see Figures 3-5 As a further implementation of the overall equipment: a movable spring 25 is connected to one side of the push sleeve 12. The movable spring 25 is movably sleeved on the outside of the support rod 13, and the other end of the movable spring 25 is in contact with the rotating plate 7.

[0025] A connecting spring 26 is movably sleeved on the outer side of the limiting rod 16, and the two ends of the connecting spring 26 are connected to the limiting plate 17 and the rotating frame 15 respectively.

[0026] Both the end of the limiting rod 16 and the edge of the inner wall of the limiting groove 18 adopt a rounded corner structure design.

[0027] The slot 19 is a ring structure located on the outside of the lever 5.

[0028] More specifically, when it is necessary to adjust the number of installation racks 3 or the installation position, the installation racks 3 need to be removed first. First, rotate the rotating plate 7 in the forward direction. The rotating plate 7 will drive the rotating hole 11 and the rotating groove 10 to rotate in the forward direction. When the rotating hole 11 rotates to the position concentric with the support plate 14, push the push sleeve 12. The push sleeve 12 will drive one side of the support rod 13 and the support plate 14 to gradually slide through the rotating hole 11. The push sleeve 12 will cooperate with the rotating plate 7 to compress the movable spring 25. When the movable spring 25 is compressed to its limit, the support plate 14 closest to the push sleeve 12 will just slide through the rotating hole 11 and move to the other side of the rotating plate 7. Then, rotate the rotating plate 7 in the reverse direction, so that the rotating plate 7 drives the rotating hole 11 and the rotating groove 10 to rotate in the opposite direction, thereby making the support... Rod 13 enters the rotating groove 10. Then, the support rod 13 and a support plate 14 near the push sleeve 12 cooperate to limit the push sleeve 12 to one side of the rotating plate 7, so that the push sleeve 12 no longer limits the outer wall of the limiting plate 17. Then, the control sleeve 6 is rotated in the forward direction. The control sleeve 6 will drive the rotating frame 15 on one side to rotate in the forward direction. Then, the rotating frame 15 will drive the limiting plate 17, the limiting rod 16, and the connecting spring 26 to rotate in the forward direction, so that the inner wall of the limiting groove 18 presses against one end of the limiting rod 16. Due to the rounded corner structure design at the edge of the inner wall of the limiting groove 18, one end of the limiting rod 16 will disengage from the limiting groove 18, and the other end of the limiting rod 16 will drive the limiting plate 17 to slide outward, so that the limiting plate 17 drives the connecting spring 26 to stretch outward. Simultaneously, the control sleeve 6 will drive the inner diameter-changing groove 8 to rotate forward. Then, the diameter-changing plate 9 will slide in the diameter-changing groove 8, and the diameter-changing plate 9 will drive one side of the locking block 20 to slide outward, causing the locking block 20 to disengage from the locking groove 19. Then, the locking sleeve 4 will be pulled outward, so that the locking sleeve 4 is removed from the outside of the locking rod 5. Then, the other corresponding locking sleeve 4 will be removed by referring to the above process. Then, the placement frame 3 will be pulled outward to remove the placement frame 3. When it is necessary to install the placement frame 3, first slide the placement frame 3 between the two corresponding fixing blocks 2, so that the locking rod 5 fixedly connected to one side of the fixing block 2 passes through the reserved installation hole on the placement frame 3. Then, the locking sleeve 4 will be fitted from the outside of the placement frame 3 to the outside of the locking rod 5. Then, rotate in the opposite direction. The control sleeve 6 drives one side of the rotating frame 15 to rotate in the opposite direction. This causes the rotating frame 15 to drive the limiting rod 16, the limiting plate 17, and the connecting spring 26 to rotate in the opposite direction. Simultaneously, the control sleeve 6 drives the inner diameter-changing groove 8 to rotate in the opposite direction. Then, the diameter-changing plate 9 moves in the opposite direction and resets in the diameter-changing groove 8, causing the locking block 20 to re-engage in the slot 19. At this point, the rotating frame 15 drives the limiting rod 16 and other components to rotate and reset to the corresponding position in the limiting groove 18. Then, the connecting spring 26 pulls the limiting plate 17 to slide inward and reset, causing the limiting plate 17 to drive one side of the limiting rod 16 to slide inward. Then, one end of the limiting rod 16 will re-insert into the original limiting groove 18. Finally, the rotating plate 7 is rotated in the forward direction again.This causes the rotating plate 7 to rotate the rotating hole 11 and the rotating groove 10 again in the forward direction. When the rotating hole 11 rotates to the position concentric with the support plate 14, the movable spring 25 pushes the push sleeve 12 to slide back to its original position. Then, the push sleeve 12 will drive one side of the support rod 13 and the two support plates 14 to slide back to their original positions. After the movable spring 25 has fully reset, the support plate 14 at the top of the support rod 13 moves back to the original side of the rotating plate 7. Then, the rotating plate 7 is rotated in the reverse direction again, causing the rotating plate 7 to rotate the rotating hole 11 and the rotating groove 10 to rotate back to their original positions. The rotating hole 11 and the rotating groove 10 are rotated back to a position that does not correspond to the support rod 13 and the support plate 14. Then, the support rod 13, in conjunction with the top support plate 14, supports and limits the rotating plate 7 to one side, preventing the push sleeve 12 from sliding. The inner wall of the push sleeve 12 then limits the outer wall of the limiting plate 17, preventing the limiting plate 17 and the limiting rod 16 from sliding outwards. Finally, the limiting rod 16 and the limiting groove 18 cooperate to limit the rotating frame 15, preventing the rotating frame 15 and the control sleeve 6 from rotating accidentally, thus ensuring installation stability and the stable use of the placement frame 3.

[0029] In summary, when using or operating the equipment: when the equipment needs to be used, first open the cabinet door 21 using handle 22, then adjust the number and position of the racks 3 according to the usage requirements, then place the food samples that need to be preserved on the corresponding racks 3, and then close the cabinet door 21. The observation window 23 is designed to allow staff to observe the inside of the refrigerator 1 without opening the cabinet door 21.

[0030] When it is necessary to adjust the number of installation racks 3 or the installation position, the installation racks 3 need to be removed first. First, rotate the rotating plate 7 clockwise. The rotating plate 7 will drive the rotating hole 11 and the rotating groove 10 to rotate clockwise. When the rotating hole 11 rotates to the position concentric with the support plate 14, push the push sleeve 12. The push sleeve 12 will drive the support rod 13 and the support plate 14 on one side to gradually slide through the rotating hole 11. The push sleeve 12 will cooperate with the rotating plate 7 to compress the movable spring 25. When the movable spring 25 is compressed to its limit, the support plate 14 closest to the push sleeve 12 will just slide through the rotating hole 11 and move to the other side of the rotating plate 7. Then, rotate the rotating plate 7 in the reverse direction, so that the rotating plate 7 drives the rotating hole 11 and the rotating groove 10 to rotate in the opposite direction, thereby allowing the support rod 13 to enter. The push sleeve 12 is inserted into the rotating groove 10. Then, the support rod 13 and the support plate 14 near the push sleeve 12 cooperate to limit the push sleeve 12 to one side of the rotating plate 7, so that the push sleeve 12 no longer limits the outer wall of the limiting plate 17. Then, the control sleeve 6 is rotated in the forward direction. The control sleeve 6 will drive the rotating frame 15 on one side to rotate in the forward direction. Then, the rotating frame 15 will drive the limiting plate 17, the limiting rod 16, and the connecting spring 26 to rotate in the forward direction, so that the inner wall of the limiting groove 18 presses against one end of the limiting rod 16. Due to the rounded corner structure design at the edge of the inner wall of the limiting groove 18, one end of the limiting rod 16 will disengage from the limiting groove 18, and the other end of the limiting rod 16 will drive the limiting plate 17 to slide outward, so that the limiting plate 17 drives the connecting spring 26 to stretch outward. The control sleeve 6 will drive the inner diameter-changing groove 8 to rotate forward. Then, the diameter-changing plate 9 will slide in the diameter-changing groove 8, and the diameter-changing plate 9 will drive one side of the locking block 20 to slide outward, so that the locking block 20 disengages from the locking groove 19. Then, the locking sleeve 4 will be pulled outward, so that the locking sleeve 4 is removed from the outside of the locking rod 5. Then, the other corresponding locking sleeve 4 will be removed in the same way. Then, the placement frame 3 will be pulled outward to remove the placement frame 3. When it is necessary to install the placement frame 3, first slide the placement frame 3 between the two corresponding fixing blocks 2, so that the locking rod 5 fixedly connected to one side of the fixing block 2 passes through the reserved installation hole on the placement frame 3. Then, the locking sleeve 4 will be fitted from the outside of the placement frame 3 to the outside of the locking rod 5. Then, the control sleeve 6 will be rotated in the opposite direction. Control sleeve 6 drives one side of the rotating frame 15 to rotate in the opposite direction, causing the rotating frame 15 to drive the limiting rod 16, the limiting plate 17, and the connecting spring 26 to rotate in the opposite direction. Simultaneously, control sleeve 6 drives the inner diameter-changing groove 8 to rotate in the opposite direction. Then, the diameter-changing plate 9 moves in the opposite direction and resets within the groove 8, causing the locking block 20 to re-engage in the slot 19. At this point, the rotating frame 15 drives the limiting rod 16 and other components to rotate and reset to their corresponding positions in the limiting groove 18. Then, the connecting spring 26 pulls the limiting plate 17 to slide inwards, causing the limiting plate 17 to drive one side of the limiting rod 16 to slide inwards. One end of the limiting rod 16 then re-inserts into its original limiting groove 18. Finally, the rotating plate 7 rotates forward again.This causes the rotating plate 7 to rotate the rotating hole 11 and the rotating groove 10 again in the forward direction. When the rotating hole 11 rotates to the position concentric with the support plate 14, the movable spring 25 pushes the push sleeve 12 to slide back to its original position. Then, the push sleeve 12 will drive one side of the support rod 13 and the two support plates 14 to slide back to their original positions. After the movable spring 25 has fully reset, the support plate 14 at the top of the support rod 13 moves back to the original side of the rotating plate 7. Then, the rotating plate 7 is rotated in the reverse direction again, causing the rotating plate 7 to rotate the rotating hole 11 and the rotating groove 10 to rotate back to their original positions. The rotating hole 11 and the rotating groove 10 are rotated back to a position that does not correspond to the support rod 13 and the support plate 14. Then, the support rod 13, in conjunction with the top support plate 14, supports and limits the rotating plate 7 to one side, preventing the push sleeve 12 from sliding. The inner wall of the push sleeve 12 then limits the outer wall of the limiting plate 17, preventing the limiting plate 17 and the limiting rod 16 from sliding outwards. Finally, the limiting rod 16 and the limiting groove 18 cooperate to limit the rotating frame 15, preventing the rotating frame 15 and the control sleeve 6 from rotating accidentally, thus ensuring installation stability and the stable use of the placement frame 3.

[0031] Of all the solutions mentioned above, those involving the connection between two components can be selected according to the actual situation, such as welding, bolt and nut connection, bolt or screw connection, or other known connection methods, which will not be elaborated here. For all the fixed connections mentioned above, welding is preferred. Although embodiments of this utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this utility model. The scope of this utility model is defined by the appended claims and their equivalents.

Claims

1. A food preservation and sample retention cabinet for canteen meals, comprising a preservation cabinet (1), characterized in that: The refrigerator (1) is fixedly provided with a fixing block (2) on the inside. A placement rack (3) is slidably provided above the fixing block (2). A detachable sleeve (4) is provided on the outside of the placement rack (3). A locking rod (5) is fixedly provided on one side of the fixing block (2). The sleeve (4) is detachably fitted on the outside of the locking rod (5). A control sleeve (6) is rotatably fitted on the outside of the sleeve (4). A rotating plate (7) is rotatably provided on the outside of the sleeve (4). A variable diameter groove (8) is opened on the inside of the control sleeve (6). A variable diameter plate (9) is slidably provided in the variable diameter groove (8). A rotating groove (10) is opened on the rotating plate (7). A rotating hole (11) is provided at one end of the rotating groove (10). A push sleeve (12) is slidably sleeved on the outside of the sleeve (4). A support rod (13) is provided on one side of the push sleeve (12). A support plate (14) is provided on the support rod (13). The support plate (14) is provided in two places. A rotating frame (15) is provided on one side of the control sleeve (6). A limiting rod (16) is slidably provided in the rotating frame (15). A limiting plate (17) is provided at one end of the limiting rod (16). A limiting groove (18) is provided on the outside of the sleeve (4). A slot (19) is provided on the outside of the clamping rod (5). A clamping block (20) is provided on one side of the variable diameter plate (9).

2. The food preservation and sample retention cabinet for canteen meals according to claim 1, characterized in that: The refrigerator (1) has a door (21) that rotates on one side, and a handle (22) is fixed on the outside of the door (21).

3. The food preservation and sample retention cabinet for canteen meals according to claim 2, characterized in that: The cabinet door (21) is detachably provided with an observation window (23), which is made of transparent material.

4. The food preservation and sample retention cabinet for canteen meals according to claim 3, characterized in that: The placement rack (3) has multiple through slots (24).

5. A food sample preservation cabinet for canteen meals according to any one of claims 1-4, characterized in that: A movable spring (25) is connected to one side of the push sleeve (12). The movable spring (25) is movably sleeved on the outside of the support rod (13). The other end of the movable spring (25) is in contact with the rotating plate (7).

6. A food sample preservation cabinet for canteens according to claim 5, characterized in that: The limiting rod (16) is movably sleeved with a connecting spring (26), and the two ends of the connecting spring (26) are connected to the limiting plate (17) and the rotating frame (15) respectively.

7. A food sample preservation cabinet for canteens according to claim 6, characterized in that: Both the end of the limiting rod (16) and the edge of the inner wall of the limiting groove (18) are designed with rounded corners.

8. A food sample preservation cabinet for canteens according to claim 1, characterized in that: The slot (19) is a ring structure located on the outside of the lever (5).

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