A frame for a freeze dryer

Abstract

This utility model relates to the field of freeze dryer technology, specifically disclosing a frame for a freeze dryer. The frame is installed inside the freeze dryer, and a first motor is mounted above it. A hydraulic rod is installed at the power output end of the first motor, and a first connecting plate is fixedly connected to the telescopic end of the hydraulic rod. A pushing mechanism for entering and exiting the freeze dryer is provided on the first connecting plate. A tray for carrying the material to be freeze-dried is provided on the pushing mechanism. A lifting mechanism for raising and lowering the pushing mechanism is provided on the first connecting plate. A cleaning mechanism for cleaning the area under the tray is provided on the lifting mechanism. This invention solves the technical problem that existing trays pose a certain risk of contamination to the freeze dryer and the material to be freeze-dried within the tray when transferred to the freeze dryer.

Description

Technical Field

[0001] This utility model relates to the field of freeze dryer technology, and specifically discloses a frame for a freeze dryer. Background Technology

[0002] A freeze dryer (vacuum freeze dryer) is a device that removes moisture from materials through the principle of sublimation. Its core function is to freeze water-containing materials at low temperatures, and then sublimate the solid ice directly into a gaseous state in a vacuum environment, thus achieving drying. This technology is widely used in the food, pharmaceutical, and biological product industries, effectively preserving the nutritional components, biological activity, and original structure of materials. It is particularly suitable for the long-term preservation and transportation of heat-sensitive substances (such as vaccines, probiotics, and high-end food ingredients). A freeze dryer mainly consists of a refrigeration system, a vacuum system, a heating system, and a control system. By precisely controlling temperature and pressure, it ensures a stable and efficient drying process, ultimately obtaining freeze-dried products with extremely low moisture content and excellent rehydration properties.

[0003] Existing devices only solve the problems of low adaptability and inconvenient operation caused by fixed tray spacing in freeze-dried food processing. Through adjustable positioning components and automated motion mechanisms, the tray spacing can be freely adjusted and the hanger can be easily moved in and out. However, the trays themselves still need to be manually transported to the shelves inside the freeze dryer. Manual operation is prone to errors and may cause the trays to be placed at an angle, resulting in material spillage. During the feeding and unloading process, friction between the trays and the shelves will generate metal particles, which cannot meet the requirements of GMP (Good Manufacturing Practice). When loading manually, operators may neglect to clean the bottom of the trays, which may cause impurities to be carried into the freeze dryer cavity. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a frame for a freeze dryer to solve the technical problem that existing pallets pose a certain risk of contamination to the freeze dryer and the materials to be freeze-dried in the pallet when they are transferred into the freeze dryer.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a frame for a freeze dryer, applied to a freeze dryer, wherein a plate is installed inside the freeze dryer, a first motor is installed above the freeze dryer, a hydraulic rod is provided at the power output end of the first motor, a first connecting plate is fixedly connected to the telescopic end of the hydraulic rod, a pushing mechanism for entering and exiting the freeze dryer is provided on the first connecting plate, a tray for carrying the material to be freeze-dried is provided on the pushing mechanism, a lifting mechanism for driving the pushing mechanism to rise and fall is provided on the first connecting plate, and a cleaning mechanism for cleaning the area under the tray is provided on the lifting mechanism.

[0006] In this solution, the lifting mechanism can precisely drive the pushing mechanism to move vertically. Combined with the horizontal pushing function of the pushing mechanism, the tray can be smoothly and accurately delivered into the shelf inside the freeze dryer. The entire process is automated and requires no manual intervention, which greatly improves work efficiency and reduces labor costs and operational risks. During the automatic tray transfer process, the cleaning mechanism simultaneously cleans the bottom surface of the tray, effectively solving the problem of impurities easily sticking to the bottom of the tray and being difficult to detect and clean. This ensures that the tray enters the freeze dryer clean and tidy, avoiding the risk of contamination of the freeze-dried materials by impurities and improving product quality.

[0007] Furthermore, the pushing mechanism includes two sliding frames, which are mounted on the lifting mechanism. A slidable sliding frame is provided between the two sliding frames. A toothed rail is provided below the sliding frame. An inlet and outlet are provided on the side of the sliding frame near the freeze dryer. A positioning groove that can be adapted to the tray is provided on the sliding frame. A permanent magnet strip that can be magnetically connected to the tray is installed in the positioning groove. A third motor is provided on the two sliding frames. The power output end of the third motor is fixedly connected to a gear that meshes with the toothed rail for transmission.

[0008] In this solution, two sliding frames are used in conjunction with a lifting mechanism. The sliding frames can slide between the sliding frames and achieve precise and stable horizontal movement through the meshing transmission of the toothed rail and gears. The sliding frames are designed with positioning grooves that are compatible with the pallet and are equipped with permanent magnet strips, which can magnetically connect with the pallet made of 430 stainless steel. This magnetic attraction method is not only stable and secure, but also effectively reduces the direct contact between the pallet and the board during pallet transportation, thereby significantly reducing friction and avoiding the risk of wear on the pallet and board caused by friction, as well as the risk of metal debris from friction contaminating the freeze-dried materials.

[0009] Furthermore, the pushing mechanism also includes a limiting frame, which is fixedly connected to the plate layer.

[0010] In this solution, even if vibration or other external forces interfere during the freeze-drying process, the limiting frame can effectively prevent the pallet from shifting, ensuring that the pallet always remains in a stable position, thereby guaranteeing the smooth progress of the freeze-drying process and the quality stability of the material.

[0011] Furthermore, the lifting mechanism includes a mounting frame, which is fixedly connected to the first connecting plate. A movable plate is slidably connected inside the mounting frame, and two sliding brackets are fixedly connected to the movable plate. A screw is provided inside the mounting frame, with one end of the screw rotatably connected to the mounting frame and the other end of the screw threadedly connected to the movable plate and passing through the mounting frame. A second motor is provided on the mounting frame, and the power output shaft of the second motor is fixedly connected to one end of the screw passing through the mounting frame. An auxiliary support positioning device for assisting in supporting the movable plate is provided on the movable plate.

[0012] In this solution, the threaded connection between the screw and the moving plate, combined with the guiding function of the mounting frame, enables the moving plate to maintain a stable height during the lifting process, effectively avoiding problems such as shaking and tilting that may occur in traditional lifting mechanisms, and ensuring accurate transmission and stable placement of the pallet.

[0013] Furthermore, the auxiliary support positioning device includes a base plate, which is fixedly connected to the mounting frame. A distance measuring sensor is installed below the base plate, and a guide rod is installed above the base plate. One end of the guide rod is fixedly connected to the base plate, and the other end of the guide rod passes through the movable plate and is fixedly connected to the first connecting plate.

[0014] In this design, the guide rod provides good guidance and auxiliary support for the moving plate, effectively enhancing the stability of the moving plate during the lifting process and preventing unstable phenomena such as swaying or tilting, thereby ensuring the smooth operation of the entire lifting mechanism.

[0015] Furthermore, the cleaning mechanism includes a cleaning frame, which is fixedly connected to the movable plate and located between the two sliding frames. The cleaning frame has a cleaning fluid storage chamber inside, and a water pump is installed in the cleaning fluid storage chamber. The water outlet of the water pump is connected to multiple nozzles aligned with the bottom of the tray. A scraper that can contact the bottom of the tray is fixedly connected inside the cleaning frame, and a wiping block that can contact the tray is installed inside the cleaning frame.

[0016] In this solution, as the sliding frame moves the pallet, the nozzle precisely sprays the cleaning solution onto the bottom surface of the pallet, instantly dissolving any adhering impurities. The scraper then follows to remove any remaining droplets and solid particles, and finally, the wiping block thoroughly dries the bottom surface of the pallet. The entire cleaning process is completed in one go along the pallet's travel path, requiring no additional manual intervention or separate cleaning steps. This highly efficient integration into the pallet transport process saves time and resources while significantly improving cleaning effectiveness. It ensures that there are no sticky impurities on the bottom of the pallet, avoiding potential contamination of the freeze-dried materials and improving product quality.

[0017] The working principle and beneficial effects of this solution are as follows:

[0018] When the tray needs to be placed into the freeze dryer's shelf, the hydraulic rod drives the first connecting plate to move. A distance sensor precisely controls the stopping position to ensure the mounting frame does not collide with the freeze dryer while the rotating disc is rotating, and the freeze dryer's door opens during the movement. Subsequently, the first motor drives the rotating disc to rotate, bringing the mounting frame to the appropriate position. The hydraulic rod again drives the connecting plate closer to the freeze dryer, and the distance sensor stops it. At this point, the second motor drives the screw to rotate, moving the moving plate. The moving plate, assisted by a guide rod, is raised and lowered smoothly and precisely to adjust its height, placing the tray in the sliding frame's positioning slot. A permanent magnet then adheres and secures the tray. The second motor drives the cleaning frame to be parallel to the shelf, and the third motor drives the gear to rotate. The sliding frame extends into the freeze dryer, the water pump starts, and the cleaning solution is sprayed through the nozzle to the bottom of the tray for cleaning and disinfection. The tray passes through the scraper and wiping block in sequence to thoroughly clean the bottom. The sliding frame moves the tray above the shelf, and the second motor continues to drive the sliding frame closer to the shelf. The bottom of the tray contacts the shelf and is located within the limiting frame. As the sliding frame continues to move, the tray separates from the sliding frame due to the shelf obstruction. After the magnetic attraction ends, the hydraulic rod drives the connecting plate away from the freeze dryer, and the sliding frame moves out, completing the automatic pushing. When the tray is picked up, the motor drives the sliding frame to move to the corresponding shelf, the sliding frame extends under the tray, lifts and attracts the tray, and the hydraulic rod drives it to move out of the freeze dryer and to a height that is easy for staff to pick up. The whole process eliminates the risk of contamination from manual operation and solves the technical problem that existing trays pose a certain risk of contamination to the freeze dryer and the materials to be freeze-dried in the tray when they are transferred into the freeze dryer.

[0019] Other advantages, objectives, and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination and study, or may be learned from practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of an embodiment;

[0021] Figure 2 This is a schematic diagram of the lifting mechanism structure in an embodiment;

[0022] Figure 3 This is a schematic diagram of the push mechanism structure in an embodiment;

[0023] Figure 4 This is a schematic diagram of the gear and sliding frame in an embodiment;

[0024] Figure 5 This is a schematic diagram of the cleaning mechanism structure in an embodiment;

[0025] Figure 6 This is a schematic diagram of the structure of the first motor and the rotating disk in an embodiment.

[0026] The following components are labeled in the attached diagram: 1. Freeze dryer; 2. Plate; 3. First motor; 4. Rotary disc; 5. Hydraulic rod; 6. First connecting plate; 7. Mounting frame; 8. Moving plate; 9. Screw; 10. First fixed frame; 11. Second motor; 12. Base plate; 13. Distance sensor; 14. Guide rod; 15. Sliding frame; 16. Sliding frame; 17. Permanent magnet strip; 18. Second fixed frame; 19. Third motor; 20. Inlet / outlet; 21. Positioning groove; 31. Gear rail; 23. Limiting frame; 24. Cleaning frame; 25. Water pump; 26. Nozzle; 27. Scraper; 28. Wiping block; 29. ​​Cleaning fluid storage chamber; 30. Tray; 22. Gear. Detailed Implementation

[0027] The following detailed description illustrates the specific implementation method: Example

[0028] like Figures 1 to 6 As shown, a frame for a freeze dryer is disclosed, applied to a freeze dryer 1, including a plate layer 2, a first motor 3, a rotating disk 4, a hydraulic rod 5, a first connecting plate 6, a lifting mechanism, a pushing mechanism, a tray 30, and a cleaning mechanism. The freeze dryer 1 is provided with a plate layer 2. The first motor 3 is installed on the upper surface of the freeze dryer 1. The rotating disk 4 is installed on the power output end of the first motor 3. The hydraulic rod 5 is provided on the rotating disk 4. The first connecting plate 6 is fixedly connected to the telescopic end of the hydraulic rod 5. The lifting mechanism is provided on the first connecting plate 6. The lifting mechanism is provided with a pushing mechanism. The lifting mechanism is used to drive the pushing mechanism to move. The tray 30 is installed on the pushing mechanism. The tray 30 is made of 430 stainless steel. The pushing mechanism is used to push the tray 30 onto the plate layer 2. The pushing mechanism is provided with a cleaning mechanism. The cleaning mechanism is used to clean the lower surface of the tray 30.

[0029] like Figure 2 As shown, the lifting mechanism includes a mounting frame 7, a movable plate 8, a screw 9, a first fixed frame 10, a second motor 11, and an auxiliary support positioning device. The mounting frame 7 is fixedly connected to the lower end face of the first connecting plate 6. The movable plate 8 is provided inside the mounting frame 7 and slides with the mounting frame 7. The screw 9 is provided inside the mounting frame 7. One end of the screw 9 is rotatably connected to the mounting frame 7, and the other end of the screw 9 is threadedly connected to the movable plate 8 and passes through the mounting frame 7. The first fixed frame 10 is fixedly connected to the mounting frame 7. The second motor 11 is mounted on the first fixed frame 10. The power output shaft of the second motor 11 is fixedly connected to the screw 9 through a coupling. The auxiliary support positioning device is provided on the movable plate 8 and is used to assist in supporting the lifting movement of the movable plate 8.

[0030] like Figure 2As shown, the auxiliary support positioning device includes a base plate 12, a distance sensor 13, and a guide rod 14. The base plate 12 is horizontally fixed to the side wall of the mounting frame 7. The distance sensor 13 is installed on the side wall of the freeze dryer 1 facing the base plate 12. The distance sensor 13 is used to detect the distance between the base plate 12 and the freeze dryer 1. The guide rod 14 is vertically arranged on the base plate 12. One end of the guide rod 14 is fixedly connected to the base plate 12, and the other end of the guide rod 14 passes through the moving plate 8 and is fixedly connected to the first connecting plate 6. The distance sensor 13 is a SICKDL100Hi laser distance sensor.

[0031] like Figure 3 and Figure 4 As shown, the pushing mechanism includes two sliding frames 15, a sliding frame 16, a permanent magnet strip 17, a second fixed frame 18, a third motor 19, and a gear 22. Two sliding frames 15 are fixedly connected to the moving plate 8. A slidable sliding frame 16 is installed between the two sliding frames 15. The two sliding frames are slidably arranged in the sliding grooves on both sides of the sliding frame. A toothed rail 31 is opened on the lower end face of the sliding frame 16. An inlet and outlet 20 is opened on the side of the sliding frame 16 near the freeze dryer 1. The width of the inlet and outlet 20 is greater than the width of the tray 30. A positioning groove 21 is opened on the sliding frame 16. The tray 30 is adapted to the positioning groove 21. A permanent magnet strip 17 is installed in the positioning groove 21. The permanent magnet strip 17 is magnetically connected to the tray 30. One of the two sliding frames 15 is fixedly connected to the second fixed frame 18. The third motor 19 is installed on the second fixed frame 18. A gear 22 is fixedly connected to the power output end of the third motor 19. The gear 22 meshes with the toothed rail 31 for transmission.

[0032] like Figure 1 As shown, the pushing mechanism also includes a limiting frame 23, which is fixedly connected to the plate layer 2.

[0033] like Figure 5 As shown, the cleaning mechanism includes a cleaning frame 24, a water pump 25, multiple nozzles 26, a scraper 27, and a wiping block 28. The cleaning frame 24 is fixedly connected to the moving plate 8 and is located between two sliding frames 15. The cleaning frame 24 has a cleaning fluid storage chamber 29 inside, and the water pump 25 is installed in the cleaning fluid storage chamber 29. Multiple nozzles 26 are installed at the water outlet of the water pump 25, and the water outlets of the multiple nozzles 26 are aligned with the bottom of the tray 30. The scraper 27 is fixedly connected inside the cleaning frame 24 and contacts the bottom of the tray 30. The scraper 27 is made of medical silicone. The wiping block 28 is fixedly connected inside the cleaning frame 24 and contacts the bottom of the tray 30.

[0034] In practice

[0035] When the tray 30 needs to be transferred to the plate 2 inside the freeze dryer 1, the hydraulic rod 5 on the rotating disk 4 first drives the first connecting plate 6 to move away from the freeze dryer 1. At this time, the distance sensor 13 on the base plate 12 continuously detects the distance between the base plate 12 and the side wall of the freeze dryer 1. When the set distance is reached, the distance sensor 13 transmits a signal to the controller on the hydraulic rod 5. The controller controls the hydraulic rod 5 to stop working. Subsequently, the rotating disk 4 will not collide with the freeze dryer 1 during the rotation of the mounting frame 7 on the first connecting plate 6. During the movement of the first connecting plate 6, the door of the freeze dryer 1 is opened. Then, the first motor 3 on the freeze dryer 1 drives the rotating disk 4 to rotate 90 degrees counterclockwise. At this time, the rotating disk 4 will drive the mounting frame 7 on the first connecting plate 6 to rotate to the side of the freeze dryer 1 that is opened. Then, the hydraulic rod 5 drives the first connecting plate 6 to move closer to the freeze dryer 1. When the distance sensor 13 detects that the distance between the bottom plate 12 and the freeze dryer 1 has been restored, the distance sensor 13 transmits a signal to the controller on the hydraulic rod 5 again, and the controller controls the hydraulic rod 5 to stop working.

[0036] At this time, the second motor 11 on the first fixed frame 10 drives the screw 9 to rotate. Since the moving plate 8 is threadedly connected to the screw 9, the screw 9 will drive the moving plate 8 to move within the mounting frame 7 during rotation. During the movement of the moving plate 8, the guide rod 14 assists in lifting and lowering, improving the stability of the moving plate 8 during movement. The moving plate 8 is raised or lowered by the forward and reverse rotation of the second motor 11. The second motor 11 drives the moving plate 8 to move towards the side closer to the bottom plate 12. At this time, the tray 30 can be directly placed in the positioning groove 21 on the sliding frame 16. The permanent magnet strip 17 in the positioning groove 21 will attract and fix the tray 30 made of 430 stainless steel.

[0037] After the tray 30 is adsorbed onto the sliding frame 16, the second motor 11 drives the moving plate 8 to be parallel to the plate 2, providing a positioning reference for subsequently pushing the tray 30 onto the plate 2. Then, the third motor 19 on the second fixing frame 18 is activated, driving the gear 22 to rotate. Since the gear 22 meshes with the gear rail 31 on the sliding frame 16, when the third motor 19 drives the gear 22 to rotate, it will cause the sliding frame 16 to move between the two sliding frames 15. The counterclockwise rotation of the third motor 19 causes the sliding frame 16 to extend into the freeze dryer 1. As the sliding frame 16 moves, it also causes the tray 30 to move. At this time, the water pump 25 in the cleaning solution storage chamber 29 is activated. The water pump 25 pumps the cleaning solution to the nozzle 26, and then sprays the cleaning solution onto the bottom of the tray 30 through the nozzle 26 to clean and disinfect the bottom of the tray 30. At this time, the tray 30 is constantly moving towards the side closer to the freeze dryer 1. When the bottom of the tray 30 is cleaned by the nozzle 26, it will pass through the scraper 27, which will scrape off the cleaning solution and impurities from the bottom of the tray 30. Then the tray 30 will pass through the wiping block 28, which will wipe the bottom of the tray 30 clean. Since the second motor 11 drives the cleaning frame 24 to be parallel to the plate 2, the sliding frame 16 extends into the freeze dryer 1 and is located above the limiting frame 23 on the plate 2. At this time, the tray 30 is aligned with the limiting frame 23.

[0038] Since the second motor 11 has driven the moving plate 8 to be parallel to the plate layer 2, and the sliding frame 16 is set on the plate layer 2, after the sliding frame extends into the freeze dryer 1, the sliding frame 16 simultaneously drives the tray 30 to be above the plate layer 2. The second motor 11 drives the screw 9 to rotate, and the screw 9 drives the sliding frame 16 on the moving plate 8 to move closer to the plate layer 2. The bottom of the tray 30 contacts the top of the plate layer 2 first and is located within the limiting frame 23. At this time, the second motor 11 continues to drive the sliding frame 16 to move closer to the plate layer 2. The tray 30 is already attached to the plate 2. The tray 30 cannot continue to move with the sliding frame 16. When the sliding frame 16 continues to move, the tray 30 is separated from the sliding frame 16 due to the obstruction of the plate 2. The permanent magnet strip 17 in the positioning groove 21 will also end its magnetic attraction with the tray 30. After the sliding frame 16 is separated from the tray 30, the hydraulic rod 5 drives the first connecting plate 6 to move away from the freeze dryer 1. At this time, the sliding frame 16 is moved out through the inlet and outlet 20 and completely separated from the tray 30, completing the automatic pushing of the tray 30.

[0039] When it is necessary to remove the tray 30 from the plate 2, the second motor 11 drives the sliding frame 16 to move to the corresponding plate 2 to be removed, and the third motor 19 drives the sliding frame 16 to extend under the tray 30. The sliding frame 16 moves under the tray 30 through the inlet and outlet 20. Then, the second motor 11 drives the sliding frame 16 to move upward and lift the tray 30 through the sliding frame 16. During the contact between the sliding frame 16 and the tray 30, the permanent magnet strip 17 in the positioning groove 21 will attract and fix the tray 30. After the tray 30 is lifted and removed from the limit frame 23, the hydraulic rod 5 drives the tray 30 to move out of the freeze dryer 1. Then, the second motor 11 drives the tray 30 to move down to a height that is convenient for the staff to pick up. Then, the staff can remove the tray 30 from the sliding frame 16.

[0040] The above description is merely an embodiment of this utility model, and common knowledge such as specific structures and characteristics in the solution is not described in detail here. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model, and these should also be considered within the protection scope of this utility model. These modifications and improvements will not affect the effectiveness of the implementation of this utility model or its practicality.

Claims

1. A frame for a freeze dryer, used in a freeze dryer, characterized in that: The freeze dryer is equipped with a plate layer, and a first motor is installed above the freeze dryer. A hydraulic rod is provided at the power output end of the first motor, and a first connecting plate is fixedly connected to the telescopic end of the hydraulic rod. A pushing mechanism for entering and exiting the freeze dryer is provided on the first connecting plate. A tray for carrying the material to be freeze-dried is provided on the pushing mechanism. A lifting mechanism for driving the pushing mechanism to rise and fall is provided on the first connecting plate. A cleaning mechanism for cleaning the area under the tray is provided on the lifting mechanism.

2. The frame for a freeze dryer according to claim 1, characterized in that: The pushing mechanism includes two sliding frames, which are mounted on the lifting mechanism. A slidable sliding frame is provided between the two sliding frames. A toothed rail is provided below the sliding frame. An inlet and outlet are provided on the side of the sliding frame near the freeze dryer. A positioning groove that can be adapted to the tray is provided on the sliding frame. A permanent magnet strip that can be magnetically connected to the tray is installed in the positioning groove. A third motor is provided on the two sliding frames. The power output end of the third motor is fixedly connected to a gear that meshes with the toothed rail for transmission.

3. The frame for a freeze dryer according to claim 2, characterized in that: The pushing mechanism also includes a limiting frame, which is fixedly connected to the plate layer.

4. The frame for a freeze dryer according to claim 2, characterized in that: The lifting mechanism includes a mounting frame, which is fixedly connected to the first connecting plate. A movable plate is slidably connected inside the mounting frame. Two sliding brackets are fixedly connected to the movable plate. A screw is provided inside the mounting frame. One end of the screw is rotatably connected to the mounting frame, and the other end of the screw is threadedly connected to the movable plate and passes through the mounting frame. A second motor is provided on the mounting frame. The power output shaft of the second motor is fixedly connected to one end of the screw that passes through the mounting frame. An auxiliary support positioning device for assisting in supporting the movable plate is provided on the movable plate.

5. The frame for a freeze dryer according to claim 4, characterized in that: The auxiliary support positioning device includes a base plate, which is fixedly connected to the mounting frame. A distance measuring sensor is installed below the base plate, and a guide rod is installed above the base plate. One end of the guide rod is fixedly connected to the base plate, and the other end of the guide rod passes through the movable plate and is fixedly connected to the first connecting plate.

6. The frame for a freeze dryer according to claim 4, characterized in that: The cleaning mechanism includes a cleaning frame, which is fixedly connected to the movable plate and located between the two sliding frames. The cleaning frame has a cleaning fluid storage chamber inside, and a water pump is installed in the cleaning fluid storage chamber. The water outlet of the water pump is connected to multiple nozzles aligned with the bottom of the tray. A scraper that can contact the bottom of the tray is fixedly connected inside the cleaning frame, and a wiping block that can contact the tray is installed inside the cleaning frame.

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