Tray for packaging food sterilization

Abstract

The utility model discloses a kind of placing tray for packaging food sterilization, including tray bottom, the four side edges of tray bottom are respectively upwards fixed with corresponding tray side turn edge, the top surface middle part of tray bottom is equipped with protrusion, the part outside protrusion of tray bottom and tray side turn edge are respectively evenly provided with water-permeable through-hole B, the protrusion is separated into multiple water-permeable areas by tray bottom.The structure can know that the placing tray for packaging food sterilization of the utility model, the protrusion of the tray bottom of placing tray is equipped, the strength of placing tray is improved, and it avoids that material between being placed in placing tray is all extruded and is connected, but multiple block area is formed, so that water flow can flow between the material pile of different area, to further improve the contact degree of water flow and material, and then improve the efficiency of pasteurization, the efficiency of cooling to normal temperature and the efficiency of cooling to cold chain preservation or required temperature of transportation system.

Description

Technical Field

[0001] This utility model relates to the technical field of an automated pasteurization production line equipment, specifically to a placement tray for sterilizing packaged food. Background Technology

[0002] With the development of food processing, more and more food processing has become automated. In order to keep up with the automated and intelligent production process, existing food processing equipment needs to be upgraded.

[0003] In the food processing industry, packaged foods need to be sterilized to extend their shelf life. Currently, food production companies generally use low-temperature sterilization for packaged foods. Low-temperature sterilization maintains the original properties of the food while sterilizing it, without destroying vitamins, minerals, or other nutrients, thus preserving its nutritional value. It also does not damage or spoil the taste of the food, making it particularly suitable for temperature-sensitive foods. Moreover, it consumes significantly less energy than high-temperature sterilization. The most commonly used low-temperature sterilization method is pasteurization. Pasteurization typically uses heat below 100°C for sterilization, followed by low-temperature storage. The temperature range for pasteurization varies depending on the food being sterilized, but it generally ranges from 62°C to 90°C.

[0004] However, low-temperature sterilization also has a drawback: it generally requires a relatively long time. This can disrupt a company's production schedule. Companies typically use a tunnel structure. Depending on the food being sterilized, the temperature inside the tunnel is adjusted to a matching pasteurization temperature range. The food materials to be sterilized are then conveyed through the tunnel, with the conveying speed controlled to ensure that the time spent in the tunnel is greater than or equal to the pasteurization time. If a large amount of material enters the tunnel simultaneously, the heat exchange efficiency between the material in the middle section and the ambient temperature inside the tunnel may differ compared to the material at the edges. All of these factors necessitate reducing the conveying speed within the tunnel.

[0005] Furthermore, because the two ends of the tunnel structure are generally open to facilitate the entry and exit of trolleys carrying materials, this results in significant temperature loss within the tunnel. To maintain the temperature within the tunnel, a certain amount of energy is required to ensure that the temperature inside the tunnel remains within the pasteurization temperature range. Moreover, the openness of the two ends of the tunnel inevitably leads to a lower temperature at both ends than in the middle, resulting in uneven temperature distribution. This, in turn, causes airflow within the tunnel, further reducing the temperature and negatively impacting the sterilization effect of the materials inside. Therefore, an additional heating device is needed to ensure that the temperature inside the tunnel can be stabilized within the pasteurization temperature range.

[0006] To address the aforementioned technical issues, a sterilization tank with a patent titled "Pasteurization Machine with Multi-Layer Material Tray Placement Rack" has been developed. The method of using this sterilization tank is as follows: First, multiple materials to be sterilized are laid flat on placement trays. Then, these trays are layered inside a cage. The cage containing the trays is then placed inside the sterilization tank, which contains a water bath at the pasteurization temperature. The water level in the bath is higher than the materials. The water temperature and flow ensure simultaneous and uniform sterilization of all materials within the cage. After the required sterilization time is reached, the cage is lifted out, and another cage to be sterilized is placed inside. This method not only ensures consistent sterilization of each material in the same sterilization cycle but also improves the sterilization efficiency per unit time by simultaneously sterilizing a large quantity of materials.

[0007] However, in actual production, companies aim to maximize working time. When using a single sterilization tank, the time spent sterilizing materials in the cages is wasted. Therefore, companies use multiple sterilization tanks, with cages being placed in and removed at different times. This allows for the removal of a sterilized cage while other cages are still being sterilized, and the placement of another cage containing the material to be sterilized in the empty space within the sterilization tank. Theoretically, by adjusting time and production rhythm, at least one sterilization tank should be in use within a given time frame, thus improving production efficiency. In actual production, after pasteurization, materials need to be rapidly cooled to below 10 degrees Celsius to inhibit the growth of residual microorganisms. Therefore, cages removed from the sterilization tank are transferred to a cooling tank for rapid cooling. After reaching the designated temperature, they are removed again for subsequent processes. This results in multiple sterilization tanks, which in turn lead to a large number of operations involving lifting and placing the cages during the cooling process after sterilization. Consequently, efficiency cannot be effectively improved in actual production, and the labor intensity is particularly high.

[0008] Therefore, there is an urgent need to provide an automated production line suitable for pasteurization and cooling to solve the above problems.

[0009] Furthermore, in actual production, the applicant has discovered that during the rapid drop of materials from the pasteurization temperature to below 10 degrees Celsius, some material packaging bags frequently rupture. This not only results in the direct scrapping of materials with damaged packaging bags, but also, if the materials inside the packaging bags contain liquid, it can contaminate the cooling tank, the cooling medium within the cooling tank, and other materials. Additionally, during the development of the production line, the applicant also needs to consider minimizing the overall floor space required for the production line.

[0010] The technical problem to be solved by the technical solution of this application is how to provide a dedicated placement tray for pasteurizing packaged food in the above-mentioned production line. Utility Model Content

[0011] The purpose of this invention is to overcome the shortcomings of the prior art and provide a placement tray for sterilizing packaged food. The protrusions on the bottom of the tray increase its strength and prevent the materials placed in the tray from being crowded together. Instead, the materials are divided into multiple areas, allowing water to flow between the material piles in different areas. This further improves the contact between the water and the materials, thereby increasing the efficiency of pasteurization, cooling to room temperature, and cooling to the temperature required by cold chain storage or transportation systems.

[0012] The technical solution adopted by this utility model is: A tray for sterilizing packaged food includes a tray bottom. Corresponding side flanges are fixed upwards along the four sides of the tray bottom. A protrusion is located in the center of the top surface of the tray bottom. Water-permeable holes B are evenly distributed on the portion of the tray bottom outside the protrusion and on the side flanges. The protrusion divides the tray bottom into multiple water-permeable zones. The protrusion includes an annular protrusion A and an annular protrusion B coaxially disposed on the tray bottom. The annular protrusion B is located inside the annular protrusion A and at the center of the tray bottom. Strip-shaped protrusions are respectively provided at the apex of the annular protrusion A and connected to the annular protrusion B. The strip-shaped protrusions point towards the center of the tray bottom. The top surfaces of the annular protrusion A, annular protrusion B, and strip-shaped protrusions are flush.

[0013] A further improvement of this utility model is that an edge permeable area is formed on the outside of the annular protrusion A, a central permeable area is formed within the area enclosed by the annular protrusion B, and a middle permeable area is formed within the area enclosed by the annular protrusion A, the annular protrusion B, and the strip protrusion.

[0014] A further improvement of this utility model is that the flanges on two opposite sides of the placement tray are close to or in contact with the side edge of the annular protrusion A, and there is a gap between the flanges on the other two opposite sides of the placement tray and the side edge of the annular protrusion A.

[0015] A further improvement of this utility model is that the central permeable area within the range enclosed by the annular protrusion A and the disc side flange with a distance between them, the annular protrusion B, and the strip protrusion is called the central permeable area A; and the central permeable area within the range enclosed by the annular protrusion A near or in contact with the disc side flange, the annular protrusion B, and the strip protrusion is called the central permeable area B.

[0016] A further improvement of this utility model is that the placement trays placed in the turnover cage have side frames with a side supporting the slide rod and a side frame with a locking rod on the side facing the turnover cage, where the side flanges of any two adjacent layers of placement trays that are close to or in contact with the annular protrusion A alternately face the turnover cage.

[0017] A further improvement of this utility model is that the annular protrusion A, the annular protrusion B, and the strip protrusion are an integral structure formed by stamping the bottom of the disc.

[0018] A further improvement of this utility model is that the annular protrusion A, the annular protrusion B, and the strip protrusion are welded and fixed to the top surface of the bottom of the disc.

[0019] A further improvement of this invention is that the widths of the annular protrusion A, the annular protrusion B, and the strip protrusion are all equal.

[0020] A further improvement of this utility model is that the disc side flange is an integral structure formed by bending the bottom of the disc, and adjacent disc side flanges are welded and fixed together.

[0021] A further improvement of this utility model is that the bottom edge of the disc side flange is welded and fixed to the corresponding side edge of the disc bottom, and two adjacent disc side flanges are welded and fixed together.

[0022] The beneficial effects of this utility model are as follows: First, the placement tray for sterilizing packaged food of this utility model improves the strength of the placement tray by providing a protrusion on the bottom of the tray. Moreover, it avoids the materials placed in the placement tray from being crowded together and connected, but instead forms multiple areas, so that water can flow between the material piles in different areas, thereby further improving the degree of contact between water and materials, and thus improving the efficiency of pasteurization, the efficiency of cooling to room temperature, and the efficiency of cooling to the temperature required by cold chain storage or transportation systems.

[0023] Secondly, the placement tray for sterilizing packaged food of this utility model, through the annular protrusion A, annular protrusion B and strip protrusion, makes the bottom of the placement tray form areas of different shapes and sizes, which is suitable for dividing different materials in the placement tray into different areas, or forming multiple different areas in the placement tray, thereby further improving the flow of water between materials in different areas, and is also suitable for situations where multiple different materials are placed in the placement tray at the same time.

[0024] Third, the placement tray for sterilizing packaged food of this utility model is arranged by alternating two adjacent layers of placement trays that rotate horizontally by 90 degrees around a vertical axis. This results in different water flow directions in the adjacent layers of placement trays, which is more conducive to the formation of turbulence. This allows for more thorough contact between the material and the water, further improving the heat conduction effect between the water and the material. Attached Figure Description

[0025] Figure 1 This is a front view schematic diagram of a pasteurization and cooling production line for packaged foods (with the inlet side plate and the top beam of the hanger hidden).

[0026] Figure 2 This is a top view of a pasteurization and cooling production line for packaged food (with the overhead beams of the loading area hidden).

[0027] Figure 3 An enlarged 3D schematic diagram of the cage turnover device A (drive gear and transmission rack are hidden) hooking onto the turnover cage.

[0028] Figure 4 This is a three-dimensional enlarged schematic diagram of cage turnover device B (with the drive gear and transmission rack hidden).

[0029] Figure 5 This is a magnified front view of cage turnover device A (chain and limit bar are hidden).

[0030] Figure 6 This is a three-dimensional enlarged schematic diagram of the cage lifting clamp.

[0031] Figure 7 This is a magnified 3D diagram of the turnover cage without the placement tray.

[0032] Figure 8 A magnified 3D illustration of a turnover cage with a placement tray.

[0033] Figure 9 A magnified 3D diagram showing the placement of materials for sterilization. Detailed Implementation

[0034] like Figure 9It is known that the tray for sterilizing packaged food includes a tray bottom 760, and corresponding tray side flanges 761 are fixed upward on the four sides of the tray bottom 760. A protrusion 762 is provided in the middle of the top surface of the tray bottom 760. Water permeable holes B763 are evenly provided on the part of the tray bottom 760 outside the protrusion 762 and the tray side flanges 761. The protrusion 762 divides the tray bottom 760 into multiple water permeable areas.

[0035] The protrusion 762 includes an annular protrusion A764 and an annular protrusion B765 coaxially disposed on the bottom of the tray 760. The annular protrusion B765 is disposed inside the annular protrusion A764 and located at the center of the bottom of the tray 760. A strip protrusion 766 is provided at the top corner of the annular protrusion A764 and connected to the annular protrusion B765. The strip protrusion 766 points to the center of the bottom of the tray 760. The top surfaces of the annular protrusion A764, the annular protrusion B765 and the strip protrusion 766 are flush.

[0036] An edge permeable area is formed outside the annular protrusion A764, a central permeable area 767 is formed within the area enclosed by the annular protrusion B765, and a middle permeable area is formed within the area enclosed by the annular protrusion A764, the annular protrusion B765 and the strip protrusion 766.

[0037] Two opposite sides of the placement tray 76 have disc-side flanges 761 that are close to or in contact with the side edge of the annular protrusion A764, and there is a gap between the other two opposite sides of the placement tray 76 and the side edge of the annular protrusion A764.

[0038] The central permeable area within the range enclosed by the annular protrusion A764 and the disc side flange 761, along with the annular protrusion B765 and the strip protrusion 766, is called the central permeable area A768. The central permeable area within the range enclosed by the annular protrusion A764 near or in contact with the disc side flange 761, along with the annular protrusion B765 and the strip protrusion 766, is called the central permeable area B769.

[0039] The placement tray 76 placed inside the turnover cage 65 has a side frame 761 facing the turnover cage 65 with the side of the tray 76 that is close to or in contact with the annular protrusion A764. The side frame has a side frame on the side of the tray 76 that supports the slide rod 656 and a side frame on the side of the tray that has the locking rod 657.

[0040] The annular protrusions A764, B765, and 766 are integral structures formed by stamping the bottom plate 760.

[0041] The annular protrusions A764, B765, and 766 are welded and fixed to the top surface of the bottom plate 760.

[0042] The widths of the annular protrusion A764, the annular protrusion B765, and the strip protrusion 766 are all equal.

[0043] The disc side flange 761 is an integral structure formed by bending the disc bottom 760, and two adjacent disc side flanges 761 are welded and fixed together.

[0044] The bottom edge of the disc side flange 761 is welded and fixed to the corresponding side edge of the disc bottom 760, and two adjacent disc side flanges 761 are welded and fixed together.

[0045] Combination Figures 1-9 It is known that the pasteurization and cooling production line for packaged food includes a set of parallel tracks 4 arranged along the material sterilization conveying direction. Below the tracks 4, in a direction parallel to the tracks 4, are arranged sequentially a cage loading positioning groove 7, at least one pasteurization tank 1, at least one ambient temperature water tank 2, at least one ice water tank 3, and a cage unloading positioning groove 8. Below the tracks 4, corresponding to the positions of the cage loading positioning groove 7 and the cage unloading positioning groove 8, are the loading area 13 and the unloading area 14, respectively. A cage turnover device A is provided at one end of the track 4 corresponding to the loading area 13. 5. A cage turnover device B6 is provided at one end of the unloading area 14. Both the cage turnover device A5 and the cage turnover device B6 move back and forth along the track 4 to rotate the turnover cage 65 above the cage loading positioning groove 7, the pasteurization tank 1, the ambient temperature water tank 2, the ice water tank 3 and the cage unloading positioning groove 8. The cage transplanting device A5 and the cage turnover device B6 respectively include a transplanting frame 560 and a cage lifting clamp 561 that moves up and down within the transplanting frame 560. The cage lifting clamp 561 is used to clamp and prevent the turnover cage 65 with the placement tray 76 fixed.

[0046] The track 4 extends away from the loading area 13 at the end of the loading area 13, so that a maintenance area A17 is provided at one end of the track 4 in the loading area 13; the track 4 extends away from the loading area 13 at the end of the loading area 14, so that a maintenance area B18 is provided at one end of the track 4 in the loading area 14.

[0047] The track 4 is provided with a limit device A9 at the end corresponding to the maintenance area A17, and a limit device B10 at the end corresponding to the maintenance area B18. The limit device A9 is provided with a contact switch A, and the limit device B10 is provided with a contact switch B.

[0048] Above the track 4, at the positions corresponding to the extension of the loading area 13 to the maintenance area A17 and the extension of the unloading area 14 to the maintenance area B18, a lifting top beam 24 is provided. Below the lifting top beam 24, a lifting device for lifting the cage transplanting device A5 or the cage turnover device B6 is provided.

[0049] The lifting top beam 24 is connected to the crossbeam frame 25 fixed above the corresponding ends of the track 4.

[0050] The transplanting frame 560 has a lower side frame facing the limiting device A9 and the limiting device B10, and limiting crossbars 575 are respectively provided for the limiting device A9 and the limiting device B10.

[0051] The cage loading and positioning groove 7 is a groove plate A that matches the turnover cart A15 used for turnover of the cage 65. The two sides of the groove plate A and the edge facing the pasteurization tank 1 are provided with limiting flanges A. The edge of the groove plate A facing away from the pasteurization tank 1 is open to form a loading port. The cage unloading and positioning groove 8 is a groove plate B that matches the turnover cart B16 used for turnover of the cage 65. The two sides of the groove plate B and the edge facing the ice water tank 3 are provided with limiting flanges B. The edge of the groove plate B facing away from the ice water tank 3 is open to form a unloading port.

[0052] The limiting flange A of the trough plate A facing the pasteurization tank 1 is also provided with a contact switch C11, and the limiting flange B of the trough plate B facing the ice water tank 3 is also provided with a contact switch D12.

[0053] The loading and unloading ports are slopes. When the turnover cart A15 contacts the limiting flange A facing the pasteurization tank 1 of the trough plate A, the turnover cart A15 leaves the slope of the loading port; when the turnover cart B16 contacts the limiting flange B facing the ice water tank 3 of the trough plate B, the turnover cart B16 leaves the slope of the unloading port.

[0054] The support columns below the track 4 at the feeding port are respectively fixed with the guide side plate A26 of the turnover trolley A15, and the support columns below the track 4 at the discharging port are respectively fixed with the guide side plate B27 of the turnover trolley B16.

[0055] An observation and maintenance platform 19 is provided on one side below the track 4 along an extension direction parallel to the track 4. One end of the observation and maintenance platform 19 extends to the loading area 13 and is provided with a staircase A20. The other end of the observation and maintenance platform 19 extends to the unloading area 14 and is provided with a staircase B21.

[0056] The observation and maintenance platform 19 is located at a height lower than the opening height of the pasteurization tank 1, the opening height of the ambient temperature water tank 2, and the opening height of the ice water tank 3. Guardrails 22 are provided on both sides of the observation and maintenance platform 19, and the top height of the guardrails is higher than the opening height of the pasteurization tank 1, the opening height of the ambient temperature water tank 2, and the opening height of the ice water tank 3.

[0057] The total number of placement positions for the pasteurization tank 1 to place the turnover cage 65 is equal to the total number of placement positions for the ice water tank 3 to place the turnover cage 65, both being 2 to 4 times the total number of placement positions for the room temperature water tank 2 to place the turnover cage 65 (in this embodiment, the pasteurization tank 1 has 6 placement positions for the turnover cage 65, the room temperature water tank 2 has 2 placement positions for the turnover cage 65, and the ice water tank 3 has 6 placement positions for the turnover cage 65).

[0058] The bottom of the transplanting frame 560 is provided with track wheels 562 that match the track 4, corresponding to the edge of the track 4. The cage lifting clamp 561 is connected to the transplanting frame 560 for vertical movement via a chain 565. The chain 565 is driven by a lifting drive motor 563 fixed to the transplanting frame 560. The transplanting frame 560 is also fixed with a moving drive motor 590, which is connected to a drive gear 589. The drive gear 589 is connected to a transmission rack 23 that is parallel to and fixed to the track 4. The transmission rack 23 extends from one end of the loading area 13 away from the unloading area 14 to the other end of the unloading area 14 away from the loading area 13. The bottom of the cage lifting clamp 561 and the side of the track 4 are respectively provided with hooks 567 for rotating the cage 65. The hooks 567 are driven by a clamp drive motor 568 fixed to the cage lifting clamp 561 to move simultaneously towards or away from each other.

[0059] One end of the chain 565 is wound around the sprocket A at the top of the transplanting frame 560 and fixed to the top surface of the cage lifting clamp 561. The other end is wound around the sprocket B at the bottom of the transplanting frame 560 and fixed to the bottom surface of the cage lifting clamp 561. The sprocket A is connected to the lifting drive motor 563.

[0060] Chains 565 are symmetrically arranged at both ends of the two opposite sides of the transplanting frame 560. The sprockets A around which the chains 565 at the same end of the two opposite sides are fixedly connected to both ends of the sprocket shaft 564 on the same axis. The sprocket shaft 564 is synchronously driven by the lifting drive motor 563.

[0061] The lifting drive motor 563 is connected to one of the sprocket shafts 564 via a transmission belt A570, and the two sprocket shafts 564 are connected to each other via a transmission belt B571.

[0062] The transplanting frame 560 has a fall arresting pole 578 fixed in the middle of the inner side of the side frame corresponding to the side where the chain 565 is located. The cage lifting clamp 561 has a fall arresting device 579 fixed at the position of the fall arresting pole 578 on the side edge corresponding to the side where the connecting chain 565 is located. The top and bottom of the fall arresting device 579 are respectively provided with guide wheels 588 on both sides of the fall arresting pole 578.

[0063] The transplanting frame 560 has a guide post 572 fixed next to the transplanting frame post and arranged parallel to the transplanting frame post. The cage lifting clamp 561 is rotatably connected to the guide post 572 and the guide roller 573 rolls along the guide post 572.

[0064] The bottom of the transplanting frame 560 is fixedly provided with a transplanting base frame 574, the track wheels 562 are rotatably connected to the transplanting base frame 574, the moving drive motor 590 is fixed to the transplanting base frame 574, and the gear shaft of the drive gear 589 is rotatably connected to the transplanting base frame 574.

[0065] Two drive gears 589 are provided, which are fixedly connected to the two ends of the gear shaft respectively. Two transmission racks 23 are provided, which are fixed to the opposite sides of the track 4 respectively. The drive gears 589 are respectively meshed with the corresponding transmission racks 23 for transmission.

[0066] An "X"-shaped connecting frame 577 is fixedly provided inside the side frame of each side of the transplanting frame 560, and the ends of the "X"-shaped connecting frame 577 are respectively fixed to the top corner of the side frame of the corresponding side of the transplanting frame 560.

[0067] The transplanting frame 560 has a reinforcing upright 580 fixed to the outside of the transplanting frame upright.

[0068] A maintenance ladder 576 is fixed in the middle of one side frame of the transplanting frame 560. The maintenance ladder 576 extends upward from the transplanting bottom frame 574 to the top of the transplanting frame 560 along the side frame of the transplanting frame 560.

[0069] The cage lifting clamp 561 is provided with a translation frame 569 on the side where the hook 567 is located. The bottom of each of the two ends of the translation frame 569 is provided with a hook 567. The two ends of the translation frame 569 reciprocate along the limiting load-bearing groove 585 provided at the corresponding end of the cage lifting clamp 561. The translation frame 569 is fixed with a nut pair that is connected to the lead screw 582. The two ends of the lead screw 582 are rotatably connected to the cage lifting clamp 561 through bearing seats. The opposite ends of the lead screw 582 are simultaneously connected to the lead screw drive shaft 584 rotatably connected to the cage lifting clamp 561 through couplings 583. The clamp drive motor 568 is connected to one of the lead screws 582 or the lead screw drive shaft 584 through a transmission belt C581.

[0070] The coupling 583 includes a half coupling A fixed to the end of the lead screw drive shaft 584 and a half coupling B fixed to the lead screw 582 facing the lead screw drive shaft 584, which is coaxial with the half coupling A and circumferentially matched and engaged. The half coupling A and the half coupling B are circumferentially matched and engaged by protrusions that are respectively matched and engaged. The protrusions of the half coupling A and the protrusions of the half coupling B can achieve circumferential matching and engagement within the axial length range.

[0071] The two ends of the translation frame 569 are detachably fixed with sliding plates 586. The sliding plates 586 fixed to the ends of the translation frame 569 extend into the limiting load-bearing groove 585 and move along the limiting load-bearing groove 585.

[0072] The top surface of the translation frame 569 has two holes for inserting hooks 567 that extend downwards from both ends. The top of the hooks 567 matches the holes, and the top of the side wall of the hooks 567 is provided with positioning flanges 587. The hooks 567 that pass through the holes from top to bottom are connected to the top surface of the translation frame 569 through the positioning flanges 587.

[0073] The cage lifting clamp 561 is provided with a hook hole 591 corresponding to the movement range of the translation frame 569. The hook 567 is located within the range of the hook hole 591, and the bottom end of the hook 567 passes downward through the hook hole 591.

[0074] The turnover cage 65 includes a matching bottom frame 650 and a top frame 652. The top frame 652 is parallel to the bottom frame 650. The top corners of the bottom frame 650 and the top frame 652 are connected and fixed by cage uprights 651. Multiple layers of equally spaced supporting slides 656 are symmetrically arranged on the inner side of the turnover cage 65, between the two opposite cage uprights 651. The supporting slides 656 are horizontally arranged, and both ends are fixed to the corresponding cage uprights 651. The distances between adjacent layers of supporting slides 656 and between the top layer of supporting slides 656 and the bottom surface of the top frame 652 are equal, all greater than or equal to the height of the placement tray 76. The top frame 652 of the lifting cage includes a top rod A653 and a top rod B655 that are fixedly connected in sequence. The top rod B655 is located on the side of the supporting crossbar 656 and is arranged parallel to the supporting crossbar 656. The top rod A653 fixes the opposite ends of the two top rods B655. The middle of the side frame of the turnover cage 65 corresponding to the side of the top rod A653 is detachably fixedly connected to a locking rod 657. The bottom end of the locking rod 657 is detachably connected to the bottom rod on the corresponding side of the bottom frame 650 of the lifting cage, and the top end of the locking rod 657 is detachably connected to the top rod A653 and is tightened by a fixing nut 658. The cage lifting clamp 561 clamps the turnover cage 65 through the top frame 652 of the lifting cage.

[0075] The bottom frame 650 of the lifting cage is fixed with a bottom connecting rod 659 that is parallel to the supporting slide rod 656. The two ends of the bottom connecting rod 659 are respectively fixed to the bottom rod that is connected to the locking upright rod 657.

[0076] The turnover cage 65 has a side wall upright 654 fixedly installed in the middle of the side wall corresponding to the side where the supporting slide rod 656 is located. The bottom of the side wall upright 654 is fixed to the bottom rod on the corresponding side of the bottom frame of the cage 650, the top of the side wall upright 654 is fixed to the top rod B655, and the side wall upright 654 is fixed to the middle of the supporting slide rod 656 on the same side.

[0077] A top rod A653 is provided between the middle of the top frame 652 of the cage and the top of the corresponding side wall upright 654. The two ends of the top rod A653 are respectively fixed to the top of the corresponding side wall upright 654.

[0078] The bottom surface of the top frame 652 of the cage is fixedly provided with a mesh top plate 670.

[0079] The turnover cage 65 is detachably and fixedly connected to the inner side wall of the side wall corresponding to the side where the top rod A653 is located, and the turnover cage 65 is detachably and fixedly connected to the outer side wall of the side wall corresponding to the side where the top rod B655 is located, and the side wall frame B is detachably and fixedly connected to the outer side wall of the side wall corresponding to the side where the top rod B655 is located.

[0080] The supporting slide rod 656 has an "L" shaped cross-section. The vertical surface of the supporting slide rod 656 with an "L" shaped cross-section is fixed to the side wall of the turnover cage 65. The horizontal surface of the supporting slide rod 656 with an "L" shaped cross-section is located at the bottom of the vertical surface.

[0081] The surface of the support slide bar 656, which has an "L" shaped cross-section, is uniformly provided with multiple water-permeable holes A672.

[0082] The placement tray 76 includes a tray bottom 760, and corresponding tray side flanges 761 are fixed upward on the four sides of the tray bottom 760. A protrusion 762 is provided in the middle of the top surface of the tray bottom 760. Water permeable holes B763 are evenly provided on the part of the tray bottom 760 outside the protrusion 762 and the tray side flanges 761. The protrusion 762 divides the tray bottom 760 into multiple water permeable areas.

[0083] The protrusion 762 includes an annular protrusion A764 and an annular protrusion B765 coaxially disposed on the bottom of the tray 760. The annular protrusion B765 is disposed inside the annular protrusion A764 and located at the center of the bottom of the tray 760. A strip protrusion 766 is provided at the top corner of the annular protrusion A764 and connected to the annular protrusion B765. The strip protrusion 766 points to the center of the bottom of the tray 760. The top surfaces of the annular protrusion A764, the annular protrusion B765 and the strip protrusion 766 are flush.

[0084] An edge permeable area is formed outside the annular protrusion A764, a central permeable area 767 is formed within the area enclosed by the annular protrusion B765, and a middle permeable area is formed within the area enclosed by the annular protrusion A764, the annular protrusion B765 and the strip protrusion 766.

[0085] Two opposite sides of the placement tray 76 have disc-side flanges 761 that are close to or in contact with the side edge of the annular protrusion A764, and there is a gap between the other two opposite sides of the placement tray 76 and the side edge of the annular protrusion A764.

[0086] The central permeable area within the range enclosed by the annular protrusion A764 and the disc side flange 761, along with the annular protrusion B765 and the strip protrusion 766, is called the central permeable area A768. The central permeable area within the range enclosed by the annular protrusion A764 near or in contact with the disc side flange 761, along with the annular protrusion B765 and the strip protrusion 766, is called the central permeable area B769.

[0087] The placement tray 76 placed inside the turnover cage 65 has a side frame 761 facing the turnover cage 65 with the side of the tray 76 that is close to or in contact with the annular protrusion A764. The side frame has a side frame on the side of the tray 76 that supports the slide rod 656 and a side frame on the side of the tray that has the locking rod 657.

[0088] The annular protrusions A764, B765, and 766 are integral structures formed by stamping the bottom plate 760.

[0089] The annular protrusions A764, B765, and 766 are welded and fixed to the top surface of the bottom plate 760.

[0090] The widths of the annular protrusion A764, the annular protrusion B765, and the strip protrusion 766 are all equal.

[0091] The disc side flange 761 is an integral structure formed by bending the disc bottom 760, and two adjacent disc side flanges 761 are welded and fixed together.

[0092] The bottom edge of the disc side flange 761 is welded and fixed to the corresponding side edge of the disc bottom 760, and two adjacent disc side flanges 761 are welded and fixed together.

[0093] When the placement tray 76 is placed into the turnover cage 65, it is placed on the corresponding layer's support slide bar 656 in a top-to-bottom order.

[0094] Before using this application, the staff lays the materials to be sterilized flat on the placement tray 76, then unscrews the fixing nut 658 of the locking rod 657 on one side of the turnover cage 65 and removes the locking rod 657. Then, the side wall mesh frame 671 on that side is separated from the turnover cage 65. The staff then places the placement tray 76 containing the materials to be sterilized into the turnover cage 65 from top to bottom, starting from the side where the side wall mesh frame 671 was removed, and places the bottom sides of the placement tray 76 on the corresponding supporting slide rods 656. After the placement trays 76 are all placed or the turnover cage 65 is full of placement trays 76, the removed side wall mesh frame 671 is reconnected to the corresponding side of the turnover cage 65, and the locking rod 657 is inserted from top to bottom and tightened by the fixing nut 658.

[0095] Then, the staff uses the transfer cart A15 to transfer the transfer cage 65 containing the placement tray 76 to the loading area 13; then, the transfer cart A15, carrying the transfer cage 65, moves from the loading port of the cage loading positioning slot 7 to the slot plate A, and moves on the slot plate A until the transfer cage 65 contacts the contact switch C11; after the contact switch C11 sends a signal that there is a transfer cage 65 on the slot plate A of the cage loading positioning slot 7, and when there is a vacant placement position for the transfer cage 65 in the pasteurization tank 1, the cage transfer device A5, after completing the current transfer action, moves along the track 4 to directly above the cage loading positioning slot 7, and the cage transfer device A5 lifts the transfer cage 65 from the cage loading positioning slot 7 and moves it along the track 4. After being loaded into an empty space in the pasteurization tank 1, the cage transfer device A5 separates from the transfer cage 65, and the material inside the transfer cage 65 undergoes pasteurization. When the material in the transfer cage 65 at a certain placement position in the pasteurization tank 1 has completed pasteurization and sends a signal, and when there is an empty space in the ambient temperature water tank 2 for placing the transfer cage 65, the cage transfer device A5, after completing the current transfer action, moves along the track 4 to directly above that placement position in the pasteurization tank 1. The cage transfer device A5 lifts the transfer cage 65 at that placement position and transfers it along the track 4 to an empty space in the ambient temperature water tank 2. After that, the cage transfer device A5 separates from the transfer cage 65, and the material inside the transfer cage 65... The material is rapidly cooled to room temperature. When the material in the transfer cage 65 at a certain placement position in the room temperature water tank 2 cools to room temperature and a signal is sent, and when there is an empty placement position for the transfer cage 65 in the ice water tank 3, the cage transfer device B6, after completing the current transfer action, moves along the track 4 to directly above that placement position in the room temperature water tank 2. The cage transfer device B6 lifts the transfer cage 65 at that position and transfers it along the track 4 to an empty placement position in the ice water tank 3. Then, the cage transfer device A5 separates from the transfer cage 65, and the material inside the transfer cage 65 is cooled to a temperature suitable for cold chain storage and transportation. When the material in the transfer cage 65 at a certain placement position in the ice water tank 3 cools to a temperature suitable for cold chain storage and transportation... After the temperature for cold chain storage and transportation is met and a signal is sent, and when the contact switch D12 of the cage unloading positioning slot 8 sends a signal that there is a turnover cart B16 for turnover cage 65 on the slot plate B of the cage unloading positioning slot 8, the cage turnover device B6, after completing the current transfer action, moves along the track 4 to directly above the placement position of the ice water tank 3. The cage turnover device B6 lifts the turnover cage 65 at the placement position and transfers it along the track 4 to the turnover cart B16 of the cage unloading positioning slot 8. Then, the cage turnover device A5 separates from the turnover cage 65. Then, the workers use the turnover cart B16 to transfer the turnover cage 65 containing materials with a temperature that meets the temperature for cold chain storage and transportation to the loading station of the cold chain transportation system.When the turnover cage 65, containing materials at the required temperature for cold chain preservation and transportation, is transferred to the loading station of the cold chain preservation and transportation system, the fixing nut 658 of the locking rod 657 on one side of the turnover cage 65 is unscrewed, and the locking rod 657 is removed. Then, the side wall mesh frame 671 on that side is separated from the turnover cage 65. The worker then removes the placement tray 76 from the side where the side wall mesh frame 671 has been removed and loads it into the cold chain preservation and transportation system for cold chain preservation and transportation.

[0096] In the above process, the specific procedures for lifting and rotating the cage using cage turnover device A5 and cage turnover device B6 are as follows: When the transplanting frame 560 of cage turnover device A5 or cage turnover device B6 needs to move along track 4, the lifting drive motor 563 drives the chain 565 to lift the cage lifting clamp 561 upward along the transplanting frame 560. When the hook 567 of the cage lifting clamp 561 is not hooked on the turnover cage 65, the lifting drive motor 563 drives the chain 565 to lift the cage lifting clamp 561 until the bottom of the hook 567 is above the pasteurization tank 1, above the ambient temperature water tank 2, and above the ice water tank 3. When the hook 567 of the cage lifting clamp 561 is hooked on the turnover cage 65... At this time, the lifting drive motor 563 drives the chain 565 to lift the cage lifting clamp 561 to the position above the pasteurization tank 1, the room temperature water tank 2, and the ice water tank 3 where the bottom of the turnover cage 65 hooked by the hook 567 is located; or the lifting drive motor 563 drives the chain 565 to lift the cage lifting clamp 561 to the maximum stroke position; then the moving drive motor 590 drives the drive gear 589 to mesh with the transmission rack 23, thereby driving the track wheel 562 at the bottom of the transplant frame 560 to move along the track 4 to the corresponding position that the transplant frame 560 needs to move to.

[0097] When the transplanting frame 560 moves to the corresponding position and the turnover cage 65 at that position needs to be lifted, the clamp drive motor 568 first drives the translation frame 569 to move backward until the distance between the hook ends at the bottom of the hook 567 is greater than the maximum distance between the top rods B655 of the turnover cage 65, or even moves backward to the maximum stroke position; then the lifting drive motor 563 drives the chain 565 to move the cage lifting clamp 561 downward until the hook end at the bottom of the hook 567 is slightly lower than the top rod B655. At this time, the clamp drive motor 568 drives the translation frame 569 to move towards the opposite side until the opposite edges of the hook 567 are in contact with the top rods B655 on the corresponding side of the turnover cage 65. Then the lifting drive motor 56... 3. Drive chain 565 lifts cage lifting clamp 561 to the hook end at the bottom of hook 567, simultaneously hooking and pulling the top rods B655 on both opposite sides of turnover cage 65 to the bottom of turnover cage 65, suspending it in the air. After turnover cage 65 is stable, lifting drive motor 563 continues to drive chain 565 to lift cage lifting clamp 561 upwards until the bottom of turnover cage 65 is above pasteurization tank 1, above ambient temperature water tank 2, and above ice water tank 3. Then, moving drive motor 590 drives drive gear 589 to mesh with transmission rack 23, thereby driving track wheel 562 at the bottom of transplant frame 560 to move along track 4 to the corresponding position where turnover cage 65 hooked by transplant frame 560 needs to be moved. Then, the lifting drive motor 563 drives the chain 565 to lower the cage lifting clamp 561 downwards until the bottom of the turnover cage 65 hooked by the hook 567 contacts the corresponding empty placement slot in the pasteurization tank 1, the corresponding empty placement slot in the ambient temperature water tank 2, the corresponding empty placement slot in the ice water tank 3, or the turnover cart B16 of the slot plate B of the cage unloading positioning slot 8; after the turnover cage 65 is stable, the lifting drive motor 563 continues to drive the chain 565 to lower the cage lifting clamp 561 downwards until the bottom of the turnover cage 65 contacts the bottom of the corresponding empty placement slot in the pasteurization tank 1, the corresponding empty placement slot in the ambient temperature water tank 2, or the corresponding empty placement slot in the ice water tank 3. The bottom of the cage contacts or is placed on the turnover trolley B16, which is completely placed on the trough plate B of the cage unloading positioning trough 8. At this time, the lifting drive motor 563 continues to drive the chain 565 to lower the cage lifting clamp 561 slightly downward so that the hook end at the bottom of the hook 567 is separated from the bottom of the top rod B655 on the opposite side of the turnover cage 65. Then, the clamp drive motor 568 first drives the translation frame 569 to move backward until the distance between the hook ends at the bottom of the hook 567 is greater than the maximum distance between the top rods B655 of the turnover cage 65. Finally, the lifting drive motor 563 drives the chain 565 again to lift the cage lifting clamp 561 upward until the bottom of the hook 567 is above the pasteurization tank 1, above the ambient temperature water tank 2, and above the ice water tank 3.

[0098] When the turnover cage 65 is placed in the pasteurization tank 1, the top of the turnover cage 65 is lower than the liquid level in the pasteurization tank 1; when the turnover cage 65 is placed in the room temperature water tank 2, the top of the turnover cage 65 is lower than the liquid level in the room temperature water tank 2; when the turnover cage 65 is placed in the ice water tank 3, the top of the turnover cage 65 is lower than the liquid level in the ice water tank 3.

[0099] The ratio of the time the turnover cage 65 is immersed in the pasteurization tank 1 each time to the time the turnover cage 65 is immersed in the ambient temperature water tank 2 each time is greater than or equal to the ratio of the total number of placement positions for turnover cages 65 in all pasteurization tanks 1 to the total number of placement positions for turnover cages 65 in all ambient temperature water tanks 2.

[0100] The ratio of the time the turnover cage 65 is immersed in the ice water tank 3 each time to the time the turnover cage 65 is immersed in the room temperature water tank 2 each time is greater than or equal to the ratio of the total number of placement positions for the turnover cage 65 in all ice water tanks 3 to the total number of placement positions for the turnover cage 65 in all room temperature water tanks 2.

[0101] When the cage turnover device A5 needs maintenance, the moving drive motor 590 of the transfer frame 560 of the cage turnover device A5 drives the drive gear 589 to mesh with the transmission rack 23, thereby driving the track wheel 562 at the bottom of the transfer frame 560 to move along the track 4 to the corresponding position in the loading area 13. Then, the cage turnover device A5, located on the track 4 at the position corresponding to the loading area 13, is lifted by the lifting device under the lifting beam 24 at the position in the loading area 13 and placed on the track 4 at the position in the maintenance area A17. The limiting crossbar 575 of the transfer frame 560 of the cage turnover device A5 is in limiting contact with the limiting device A9. The contact switch A of the limiting device A9 indicates that the maintenance area A17 is repairing the cage turnover device A5. After signal 5, the turnover of all turnover cages 65 in the feeding area 13, pasteurization tank 1, ambient temperature water tank 2, ice water tank 3 and unloading area 14 is temporarily handled by cage turnover device B6 until the repaired cage turnover device A5 leaves the maintenance area A17 again through the lifting device under the lifting beam 24 at the position of the lifting device 13, and the limit crossbar 575 of the transplanting frame 560 of cage turnover device A5 no longer contacts the contact switch A of the limit device A9.

[0102] When the cage turnover device B6 needs maintenance, the moving drive motor 590 of the transfer frame 560 of the cage turnover device B6 drives the drive gear 589 to mesh with the transmission rack 23, thereby driving the track wheel 562 at the bottom of the transfer frame 560 to move along the track 4 to the corresponding position in the unloading area 14. Then, the cage turnover device B6, located on the track 4 at the position corresponding to the unloading area 14, is lifted by the lifting device under the lifting beam 24 at the position of the lifting device top ... 10. Limiting contact: After the contact switch B of the limiting device B10 sends a signal that the maintenance area B18 is repairing the cage turnover device B6, the turnover of all turnover cages 65 in the feeding area 13, pasteurization tank 1, ambient temperature water tank 2, ice water tank 3 and unloading area 14 is temporarily handled by the cage turnover device A5 until the repaired cage turnover device B6 leaves the maintenance area B18 again through the lifting device under the lifting device top beam 24 at the feeding area 13, and the limiting crossbar 575 of the transfer frame 560 of the cage turnover device B6 no longer contacts the contact switch B of the limiting device B10.

[0103] In addition, in the piping connection of pasteurization tank 1, ambient temperature water tank 2, and ice water tank 3, the water outlet A at the bottom of pasteurization tank 1 is connected to the pasteurization water tank and the ambient temperature water tank respectively through parallel pipes A and B, and the bottom drain outlet A is connected to the drainage channel; the water outlet B of ambient temperature water tank 2 is connected to the ambient temperature water tank and the pasteurization water tank respectively through parallel pipes C and D, and the bottom drain outlet B is connected to the drainage channel; the water outlet C of ice water tank 3 is connected to the ice water tank and the ambient temperature water tank respectively through parallel pipes E and F, and the bottom drain outlet C is connected to the drainage channel.

[0104] The system enables automated pasteurization of materials within the cage by transferring the placement tray containing the material to be sterilized to the feeding positioning slot in the feeding area via a transfer cart A. Then, the pasteurized material is transferred to the cold chain storage and transportation system via a transfer cart B. This effectively improves production efficiency, reduces labor intensity, and prevents the material from being recontaminated after sterilization due to operator intervention.

[0105] By using a pasteurization tank, an ambient temperature water tank, and an ice water tank, the pasteurized material is first rapidly cooled in the ambient temperature water tank to prevent microorganisms from reaching their growth temperature range. Then, it is cooled in the ice water tank to reach the temperature required for cold chain storage and transportation. This not only prevents the packaging bags from deforming, breaking, or even leaking due to a large temperature difference between the inside and outside of the bag, but also directly cools them to the temperature suitable for cold chain storage and transportation, facilitating direct cold chain storage and transportation. The cage turnover device moves the cage back and forth along the track above the cage feeding positioning slot, pasteurization tank, ambient temperature water tank, ice water tank and cage unloading positioning slot, thereby effectively reducing the floor space of the production line.

[0106] The two ends of the track extend outward to form maintenance areas, thereby reducing the turnover distance required for the cage turnover device to be maintained and facilitating the immediate turnover to the normal working area of ​​the track after maintenance. Moreover, while one cage turnover device is being maintained, the other cage turnover device can still turn the turnover cage over in the feeding area, pasteurization tank, ambient temperature water tank, ice water tank and unloading area of ​​the production line.

[0107] An observation and maintenance platform is set up on one side below the track along the extension direction parallel to the track. This not only facilitates the observation of production conditions, but also facilitates the maintenance of the pasteurization tank, ambient temperature water tank, and ice water tank.

[0108] The cage loading and unloading positioning slots enable the cage turnover device to accurately lift and rotate the turnover cages to the corresponding positions for the corresponding production processes. This facilitates the participation of the turnover cages transported by the turnover cart in the sterilization production line, thereby enabling automated sterilization.

[0109] The included side panel makes it easier for staff to move the trolley to the cage loading or unloading positioning slot.

[0110] The transplanting frame of the cage turnover device drives the cage lifting clamp to move up and down through chains symmetrically arranged at both ends on two opposite sides, thereby ensuring the smooth lifting of the cage lifting clamp.

[0111] The guide rollers of the cage lifting clamp roll along the guide uprights of the transplanting frame to prevent the turnover cage lifted by the cage lifting clamp from shaking, thereby further ensuring the lifting stability of the cage lifting clamp.

[0112] The hooks move in opposite directions or in opposite directions simultaneously by driving the translation frame of the cage lifting clamp, thus ensuring that the hooks can simultaneously hook and lift or detach the two opposite sides of the turnover cage.

[0113] The transmission structure of the translation frame and the clamp drive motor not only ensures the simultaneity of movement and the consistency of movement distance between the translation frames, but also enables transmission to be achieved during the relative movement of the translation frames in both opposite directions through the coupling transmission.

[0114] The connection between the two ends of the translation frame and the lifting clamps of the cage not only limits the movement of the translation frame in opposite directions or in opposite directions, but also provides sufficient support for the translation frame.

[0115] The hooks are inserted into the holes provided on the translation frame and positioned by the positioning flange, which facilitates the disassembly and replacement of the hooks. In addition, the sliding plates that are detachably fixed at both ends of the translation frame allow for the selection of appropriate hooks according to different specifications and sizes of turnover cages. Moreover, since the hooks are only inserted into the holes of the translation frame, there will inevitably be a certain fit margin between the hooks and the translation frame. This fit margin allows for some adjustment when the hooks are in contact with and lifted up the turnover cages, making the overall hooks more suitable for turnover cages in actual production.

[0116] By using the fall arrestor on the cage lifting clamp and the fall arrestor on the transplanting frame, the safety is improved by preventing the cage lifting clamp from falling or even dropping the cage downwards due to weight or inertia during the lifting and turnover process.

[0117] The "X-shaped" connecting frame and reinforcing uprights of the transplanting frame effectively improve its rigidity and strength, preventing deformation due to excessive weight.

[0118] By using a mobile drive motor to drive a drive gear and a transmission rack that is parallel to and fixed to the track, the simultaneity of movement of the mobile drive motor and the transplant frame and the accuracy of the movement position are ensured.

[0119] By determining the relationship between the total number of placement positions for the pasteurization tank, ambient temperature water tank, and ice water tank for placing turnover cages, it is possible to ensure that throughout the entire production cycle, all placement positions for turnover cages in the pasteurization tank, ambient temperature water tank, and ice water tank are always filled with turnover cages for corresponding sterilization, cooling to ambient temperature, and cooling to temperatures suitable for cold chain storage and transportation.

[0120] The turnover cage is only a frame structure. The placement trays are placed by supporting slides on both sides and then limited on the other two opposite sides by locking uprights. This not only fixes each layer of placement trays in the turnover cage, but also minimizes the weight of the turnover cage and allows water to quickly and easily enter the turnover cage and come into contact with the materials in the placement trays.

[0121] The mesh top plate and the two sets of side wall mesh frames A and B on the opposite side walls prevent the material placed in the trays inside the turnover cage from escaping from the turnover cage due to the water flow in the pasteurization tank, ambient temperature water tank, and ice water tank. At the same time, it ensures that the water can smoothly enter the turnover cage and come into contact with the material in the trays.

[0122] The bottom frame of the turnover cage only has a bottom connecting rod, which not only ensures the strength of the turnover cage, but also allows enough space for water to enter the bottom frame, so that the turnover cage can be quickly and smoothly immersed in water or lifted out of water.

[0123] The bottom connecting rod of the bottom frame of the turnover cage and the top rod of the top frame ...

[0124] The "L"-shaped structure supporting the slide bar, along with the water-permeable holes A, not only effectively reduces the weight of the turnover cage, but also allows water to enter the turnover cage quickly and easily, and come into contact with the materials in the tray.

[0125] The raised section on the bottom of the placement tray increases its strength and prevents the materials placed in the tray from being piled up together. Instead, it forms multiple zones, allowing water to flow between the material piles in different zones. This further increases the contact between the water and the materials, thereby improving the efficiency of pasteurization, cooling to room temperature, and cooling to the temperature required by cold chain storage or transportation systems.

[0126] The annular protrusions A, B, and strip protrusions are designed to create areas of different shapes and sizes on the bottom of the placement tray. This allows for the division of different areas into different zones for different materials within the tray, or the formation of multiple zones within the tray. This further improves the flow of water between materials in different zones and is also suitable for situations where multiple different materials are placed in the tray simultaneously.

[0127] By alternating the placement of any two adjacent layers of trays that rotate 90 degrees horizontally around the vertical axis, the water flow directions within the trays of adjacent layers are not the same, which is more conducive to the formation of turbulence, thereby allowing the material to come into fuller contact with the water and further improving the heat conduction effect between the water and the material.

Claims

1. A tray for sterilizing packaged food, characterized in that: The device includes a bottom plate (760), with corresponding flanges (761) fixed upwards on the four sides of the bottom plate (760). A protrusion (762) is provided in the center of the top surface of the bottom plate (760). Water-permeable holes B (763) are evenly provided on the portion of the bottom plate (760) outside the protrusion (762) and on the flanges (761). The protrusion (762) divides the bottom plate (760) into multiple water-permeable zones. The protrusion (762) includes a component coaxially disposed on the bottom plate (760). Annular protrusion A (764) and annular protrusion B (765) are provided inside annular protrusion A (764) and located at the center of the bottom of the plate (760). At the top corner of annular protrusion A (764), there are strip protrusions (766) that connect with annular protrusion B (765). The strip protrusions (766) point to the center of the bottom of the plate (760). The top surfaces of annular protrusion A (764), annular protrusion B (765) and strip protrusions (766) are flush.

2. The placement tray for sterilizing packaged food as described in claim 1, characterized in that: An edge permeable area is formed outside the annular protrusion A (764), a central permeable area (767) is formed within the area enclosed by the annular protrusion B (765), and a middle permeable area is formed within the area enclosed by the annular protrusion A (764), the annular protrusion B (765), and the strip protrusion (766).

3. The placement tray for sterilizing packaged food as described in claim 2, characterized in that: Two opposite sides of the placement tray (76) have disc-side flanges (761) close to or in contact with the side edge of the annular protrusion A (764), and there is a gap between the disc-side flanges (761) on the other two opposite sides of the placement tray (76) and the side edge of the annular protrusion A (764).

4. The placement tray for sterilizing packaged food as described in claim 3, characterized in that: The central permeable area within the range enclosed by the annular protrusion A (764) and the disc side flange (761) with a gap, the annular protrusion B (765) and the strip protrusion (766) is called the central permeable area A (768). The central permeable area within the range enclosed by the annular protrusion A (764) near or in contact with the disc side flange (761), the annular protrusion B (765) and the strip protrusion (766) is called the central permeable area B (769).

5. The placement tray for sterilizing packaged food as described in claim 3 or 4, characterized in that: The placement tray (76) placed in the turnover cage (65) has a side frame (761) facing the turnover cage (65) with a side frame on the side of the support slide rod (656) and a side frame on the side of the locking upright rod (657) that alternately faces the side frame of the turnover cage (65) with the side frame of the support slide rod (656) and the side frame of the locking upright rod (657) that are close to or in contact with the side frame (761) of any two adjacent layers of placement tray (76) and the side frame of the ring protrusion A (764).

6. The placement tray for sterilizing packaged food as described in claim 1, characterized in that: The annular protrusion A (764), annular protrusion B (765) and strip protrusion (766) are integral structures formed by stamping the bottom of the disc (760).

7. The placement tray for sterilizing packaged food as described in claim 1, characterized in that: The annular protrusion A (764), annular protrusion B (765) and strip protrusion (766) are welded and fixed to the top surface of the bottom of the plate (760).

8. The placement tray for sterilizing packaged food as described in claim 1, characterized in that: The widths of the annular protrusion A (764), the annular protrusion B (765), and the strip protrusion (766) are all equal.

9. The placement tray for sterilizing packaged food as described in claim 1, characterized in that: The disc side flange (761) is an integral structure formed by bending the disc bottom (760), and two adjacent disc side flanges (761) are welded and fixed together.

10. The placement tray for sterilizing packaged food as described in claim 1, characterized in that: The bottom edge of the disc side flange (761) is welded and fixed to the corresponding side edge of the disc bottom (760), and two adjacent disc side flanges (761) are welded and fixed together.

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