Fresh-keeping box for cold-chain logistics of fresh pork

Abstract

The invention relates to the technical field of cold-chain fresh-keeping boxes, in particular to a fresh pork cold-chain logistics fresh-keeping box which comprises placing plates, bearing strips, supporting plates and hinge ropes, a plurality of cuboid-shaped placing plates are symmetrically arranged on one group of opposite inner walls of a storage cavity, the upper surfaces of the two placing plates are slidably connected with a plurality of cuboid-shaped bearing strips, and the bearing strips are arranged on the upper surfaces of the cuboid-shaped placing plates. Each bearing strip is of a hollow structure, a plurality of supporting plates are movably connected to the upper surface of each bearing strip at equal intervals, each supporting plate is in an S shape, and two hinge ropes are symmetrically fixed between every two adjacent bearing strips. The problems that when fresh meat in a comparison file is placed on a plurality of fins to be frozen, the meat droops downwards towards gaps between the adjacent fins due to the gravity of the meat, the drooping meat is close to the side walls of the fins, the meat and the fins are adhered together after the meat is completely frozen, and the meat is not frozen are solved. And the convenience of the fresh-keeping box is improved, and the service life of the fresh-keeping box is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of cold chain fresh-keeping boxes, and in particular to a cold chain logistics fresh-keeping box for fresh pork. Background Art

[0002] Cold chain logistics improves the ability to preserve food without affecting the nutrition and taste of the food, and greatly increases the storage period of the food. However, since most fresh meat needs to be quickly frozen during cold chain transportation, space needs to be left between the meat to ensure that the cold air can quickly freeze the meat.

[0003] In order to solve the above problems, a Chinese patent with announcement number CN114212388B proposes a cold chain logistics safe for mutton. By arranging multiple rows of strip plates in the box and multiple fins on the outer surface of the strip plates, the contact area between the mutton and the partition is reduced when the mutton is frozen in the box. At the same time, the air flow can also flow through the gaps between the fins, thereby ensuring that the mutton is frozen while reducing the contact area between the partition and the mutton.

[0004] The disadvantage is that when fresh meat is placed on multiple fins for freezing, the meat will droop down to the gap between adjacent fins due to its own gravity. The drooping meat will be close to the side walls of the fins. After the meat is completely frozen, the two will stick together, affecting the subsequent unloading of the fresh meat and damaging the structure of the fins. Summary of the invention

[0005] The embodiment of the present application provides a fresh pork cold chain logistics preservation box, which solves the problem in the comparative document that when fresh meat is placed on multiple fins for freezing, the meat will droop downward into the gap between adjacent fins due to its own gravity, and the downward drooping meat will be close to the side walls of the fins. After the meat is completely frozen, the two will stick together, affecting the subsequent unloading of the fresh meat and damaging the fins, thereby improving the convenience and service life of the preservation box.

[0006] The embodiment of the present application provides a fresh pork cold chain logistics preservation box, including a heat-insulating box, a transverse dividing plate, a storage chamber, a freezing chamber, and a placement device; The heat insulation box is a rectangular parallelepiped structure, and a cavity is provided inside the heat insulation box; A transverse dividing plate is fixedly connected to the cavity of the heat insulation box, the transverse dividing plate is in a rectangular shape, and the transverse dividing plate divides the cavity of the heat insulation box into a storage cavity and a freezing cavity; Several groups of placement devices are arranged in the storage cavity; Each set of the placement devices includes a placement plate, a load-bearing bar, a support plate, and a hinged rope; A plurality of rectangular placement plates are symmetrically and fixedly connected to the inner wall of the storage cavity; The upper surface of the placement plate is slidably connected to a plurality of rectangular load-bearing bars, and the load-bearing bars are hollow structures; A plurality of support plates are equidistantly connected to each load-bearing bar, and the support plates are in an S-shape. When the support plates are in an S-shape, their own support can be increased by their own bending shape. When the vehicle is turning, the support plates will be over-extruded due to the centrifugal force. However, the S-shaped design of the support plates can disperse the extrusion force by their own bending shape, thereby reducing the bending of the support plates. Two hinged ropes are symmetrically fixed between adjacent load-bearing bars, and the spacing between a plurality of load-bearing bars can be adjusted by stretching the hinged ropes.

[0007] Each set of the placement devices also includes a pull rope, a rotating motor, and a transmission shaft; The inner wall of one side of the storage chamber is fixedly connected to a rotating motor; The output shaft of the rotating motor is fixedly connected to a transmission shaft, one end of the transmission shaft away from the rotating motor is rotatably connected to the side wall of the storage chamber, and the transmission shaft is parallel to the load-bearing bar; Two pull ropes are symmetrically arranged around the outer circumference of the transmission shaft, one end of the two pull ropes is fixedly connected to the side wall closest to the load-bearing bar, and the other end of the two pull ropes is fixedly connected to the load-bearing bar at the farthest side.

[0008] Furthermore, the transverse dividing plate is provided with a plurality of vent holes at equal intervals; The storage cavity is located below the freezing cavity. When refrigeration air enters the freezing cavity, the cold air is heavier and can pass through the air holes by its own weight and move into the storage cavity to quickly freeze the pork.

[0009] Furthermore, the fresh pork cold chain logistics preservation box also includes a vertical partition plate and a refrigeration device; The transverse dividing plate is fixedly connected to the rectangular vertical dividing plate, the vertical dividing plate is vertically connected to the transverse dividing plate, and the vertical dividing plate is located in the freezing chamber; A refrigeration device is fixedly connected in the freezing cavity, and the refrigeration device is located on a side of the vertical dividing plate away from the air vents.

[0010] Furthermore, a plurality of air pipes are equidistantly provided through the side wall of the vertical dividing plate, and cold air produced by the refrigeration device enters the storage cavity through the air pipes and air holes to freeze the fresh meat.

[0011] Furthermore, the fresh pork cold chain logistics preservation box also includes an air intake pipe and an exhaust pipe; The upper wall of the heat insulation box is fixedly connected to an air intake pipe, and the air intake pipe passes through the heat insulation box body and is connected to the refrigeration device; The side wall of the heat insulation box is fixedly connected to an exhaust pipe, and the exhaust pipe passes through the outer wall of the heat insulation box and is connected to the storage cavity.

[0012] Furthermore, two locking tubes are fixed to a side wall of one side of the heat insulation box, and the two locking tubes are parallel to each other.

[0013] Furthermore, two placement tubes are fixedly connected to one side of the thermal insulation box away from the locking tube, and the two placement tubes correspond to the two locking tubes one by one. The connection between the two thermal insulation boxes is achieved by engaging the placement tubes and locking tubes of the two thermal insulation boxes.

[0014] Furthermore, each set of the placement devices also includes a connecting column, a gear, and a forward and reverse motor; The support plate is rotatably connected to the load-bearing bar; Each of the load-bearing bars has a cavity, and a number of connecting columns are equidistantly connected in rotation in the cavity of the load-bearing bar, and each of the connecting columns corresponds to a support plate, and the upper end of each connecting column passes through the upper wall of the load-bearing bar and is fixedly connected to the support plate, and the lower end of each connecting column is rotatably connected to the inner bottom surface of the load-bearing bar; A gear is fixedly connected to the outer periphery of each connecting column, and the multiple gears in each load-bearing bar are meshed with each other; A forward and reverse motor is fixedly connected in the cavity opened in each load-bearing bar, and a latching tooth is fixed on the periphery of the output shaft of the forward and reverse motor, and the latching tooth fixed on the periphery of the output shaft of the forward and reverse motor is connected to a gear in the load-bearing bar.

[0015] Furthermore, each group of the placement devices also includes a lifting motor, a force-bearing plate, and a through slot; Two lifting motors are symmetrically and fixedly connected to the bottom surface of the inner cavity of each load-bearing bar, and the output shafts of the two lifting motors pass through the upper wall of the load-bearing bar, and the output shafts of the two lifting motors are slidably connected to the upper wall of the load-bearing bar; The output shafts of the two lifting motors are fixedly connected to a rectangular force-bearing plate, and when the support plate is filled with pork, the height of the force-bearing plate is lower than the height of the support plate; A plurality of circular through grooves are equidistantly formed through the upper wall of the force-bearing plate, and the plurality of through grooves correspond to the plurality of support plates one by one.

[0016] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages: First, by changing the shape of the support plate from a rectangular parallelepiped to an S-shaped support plate, the curved portion of the S-shaped support plate can provide better support for fresh pork, and at the same time, the S-shaped support plate can resist the centrifugal force generated by the pork during the vehicle turning process, thereby avoiding damage to the support plate due to the weight and centrifugal force of the pork itself, and increasing the service life of the support plate. The area of ​​the fresh pork hanging down on the support plate due to its own gravity and contacting the side wall of the support plate is reduced, so that the frozen pork can be easily taken out during unloading, which improves the unloading convenience of the cold chain logistics fresh-keeping box.

[0017] Secondly, a forward and reverse motor is fixed in the inner cavity of the load-bearing bar, and a locking tooth is fixed on the outer periphery of the output shaft of the forward and reverse motor. The operation of the forward and reverse motor causes a number of gears and connecting columns to rotate accordingly, thereby causing a number of support plates on the upper wall of the load-bearing bar to rotate back and forth in a circular motion, thereby preventing fresh pork on the surface of the support plate from sticking to the support plate during the freezing process, thereby reducing the resistance of the support plate to the pork block during the unloading process, making the unloading process more convenient, while also protecting the structure of the support plate and improving the stability and service life of the placement device.

[0018] Thirdly, when the cold chain logistics fresh-keeping box transports the pork to the designated location, the forward and reverse motors are started first to make the gears and connecting columns rotate accordingly, so that the support plates on the upper wall of the load-bearing bar rotate back and forth in the through groove, thereby separating the frozen pork and the support plates. Then, the lifting motor is started to lift the force plate upward and exceed the height of the support plate, so that the frozen pork blocks on the surface of the support plates are completely lifted up. Then the operator only needs to pull the frozen pork out directly, which further reduces the damage to the support plates during the unloading of the frozen pork blocks, and also improves the convenience of loading and unloading goods in the cold chain logistics fresh-keeping box. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A three-dimensional diagram of a cold chain logistics preservation box for fresh pork; Figure 2 It is a side sectional view of a cold chain logistics preservation box for fresh pork; Figure 3 It is a schematic diagram of the structure of the placement device; Figure 4 This is a cross-sectional view of the bottom of the load-bearing strip proposed in Example 2; Figure 5 This is a side sectional view of the load-bearing strip proposed in Example 3.

[0020] In the figure: 100, heat insulation box; 200, transverse partition plate; 300, storage chamber; 400, freezing chamber; 500, placement device; 510, placement plate; 520, load-bearing bar; 530, support plate; 540, hinge rope; 550, pull rope; 560, rotating motor; 570, transmission shaft; 580, connecting column; 590, gear; 511, forward and reverse motor; 512, lifting motor; 513, force plate; 514, through slot; 600, air vent; 700, vertical partition plate; 800, refrigeration device; 900, air pipe; 1100, air inlet pipe; 1200, exhaust pipe; 1300, locking pipe; 1400, placement pipe. DETAILED DESCRIPTION

[0021] To facilitate the understanding of the present invention, the present application will be described more comprehensively below with reference to the relevant drawings; the drawings show preferred embodiments of the present invention, but the present invention can be implemented in many different forms and is not limited to the embodiments described herein; on the contrary, the purpose of providing these embodiments is to enable a more thorough and comprehensive understanding of the disclosed content of the present invention.

[0022] It should be noted that the terms “vertical”, “horizontal”, “up”, “down”, “left”, “right” and similar expressions used in this document are only for illustrative purposes and do not represent the only implementation method.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which the present invention belongs; the terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the term "and / or" used herein includes any and all combinations of one or more related listed items.

[0024] Embodiment 1 like Figure 1-Figure 3 As shown, a fresh pork cold chain logistics preservation box includes a heat insulation box 100, a transverse dividing plate 200, a storage chamber 300, a freezing chamber 400, and a placement device 500; The heat insulation box 100 is a rectangular parallelepiped structure, and a cavity is provided inside the heat insulation box 100; The cavity of the heat insulation box 100 is fixedly connected to a transverse partition plate 200, which is in a rectangular shape and divides the cavity of the heat insulation box 100 into a storage cavity 300 and a freezing cavity 400. Several groups of placement devices 500 are arranged in the storage cavity 300; Each set of the placement device 500 includes a placement plate 510, a load-bearing bar 520, a support plate 530, and a hinge rope 540; The inner wall of the storage cavity 300 is symmetrically fixedly connected with a plurality of rectangular placement plates 510; The upper surface of the placement plate 510 is slidably connected to a plurality of rectangular load-bearing bars 520, and the load-bearing bars 520 are hollow structures; A plurality of support plates 530 are equidistantly and movably connected to each of the load-bearing bars 520. The support plates 530 are in an S-shape. When the support plates 530 are in an S-shape, their own support can be increased by their own bending shape. When the vehicle is turning, the support plates 530 may be over-extruded due to the centrifugal force. However, the S-shaped design of the support plates 530 can disperse the extrusion force by their own bending shape, thereby reducing the bending of the support plates 530. Two hinge ropes 540 are symmetrically fixed between adjacent load-bearing bars 520 , and the spacing between the load-bearing bars 520 can be adjusted by stretching the hinge ropes 540 .

[0025] Each set of the placement device 500 further includes a pull rope 550, a rotating motor 560, and a transmission shaft 570; The inner wall of one side of the storage chamber 300 is fixedly connected to a rotating motor 560; The output shaft of the rotating motor 560 is fixedly connected to a transmission shaft 570, and one end of the transmission shaft 570 away from the rotating motor 560 is rotatably connected to the side wall of the storage chamber 300, and the transmission shaft 570 is parallel to the load-bearing bar 520; Two pull ropes 550 are symmetrically arranged around the outer circumference of the transmission shaft 570 , one end of the two pull ropes 550 is fixedly connected to the side wall closest to the load-bearing bar 520 , and the other end of the two pull ropes 550 is fixedly connected to the load-bearing bar 520 at the farthest side.

[0026] Furthermore, the transverse dividing plate 200 is provided with a plurality of vent holes 600 at equal intervals. The storage chamber 300 is located below the freezing chamber 400. When refrigerated air enters the freezing chamber 400, the cold air is heavier and can move into the storage chamber 300 through the air holes 600 by its own weight to quickly freeze the pork.

[0027] Furthermore, the fresh pork cold chain logistics preservation box also includes a vertical partition plate 700 and a refrigeration device 800; The transverse partition plate 200 is fixedly connected to a rectangular vertical partition plate 700, the vertical partition plate 700 is vertically connected to the transverse partition plate 200, and the vertical partition plate 700 is located in the freezing chamber 400; The freezing chamber 400 is fixedly connected to a refrigeration device 800 , and the refrigeration device 800 is located on a side of the vertical partition plate 700 away from the air vent 600 .

[0028] Furthermore, a plurality of air pipes 900 are equidistantly provided through the side wall of the vertical partition plate 700, and the cold air produced by the refrigeration device 900 enters the storage cavity 300 through the air pipes 900 and the air holes 600 to freeze the fresh meat.

[0029] Furthermore, the fresh pork cold chain logistics preservation box also includes an air intake pipe 1100 and an exhaust pipe 1200; The upper wall of the heat insulation box 100 is fixedly connected to an air intake pipe 1100, and the air intake pipe 1100 passes through the heat insulation box 100 and is in communication with the refrigeration device 800; The side wall of the heat insulation box 100 is fixedly connected to the exhaust pipe 1200 , and the exhaust pipe 1200 passes through the outer wall of the heat insulation box 100 and is connected to the storage chamber 300 .

[0030] Furthermore, two locking tubes 1300 are fixed to a side wall of the heat insulation box 100 , and the two locking tubes 1300 are parallel to each other.

[0031] Furthermore, two placement tubes 1400 are fixedly connected to one side of the thermal insulation box 100 away from the locking tube 1300. The two placement tubes 1400 correspond to the two locking tubes 1300 one by one. The connection between the two thermal insulation boxes 100 is achieved by engaging the placement tubes 1400 and the locking tubes 1300 of the two thermal insulation boxes 100.

[0032] Specific implementation: The operator identifies the size of the fresh pork and starts the rotating motor 560 to rotate the transmission shaft 570. The rotating transmission shaft 570 pulls the multiple load-bearing bars 520 to slide in the placement plate 510 through the pull rope 550. At the same time, since the adjacent load-bearing bars 520 are fixedly connected with the hinge rope 540, the multiple load-bearing bars 520 can be close to each other under the action of the pull rope 550, so that pork of different specifications can be placed. Then the fresh pork is placed on the S-shaped support plate 530, and then the gas entering from the air inlet pipe 1100 is refrigerated by the refrigeration device 800, and then enters the storage chamber 300 through the air supply pipe 900 and the air vent 600 to freeze the fresh pork. The air in the storage chamber 300 will be discharged through the exhaust pipe 1200, thereby realizing the air circulation of the storage chamber 300 and ensuring the freshness of the pork.

[0033] Beneficial effects: By changing the shape of the support plate 530 from a rectangular parallelepiped to an S-shaped support plate 530, the curved portion of the S-shaped support plate 530 can provide better support for the fresh pork, and at the same time, the S-shaped support plate 530 can resist the centrifugal force generated by the pork during the vehicle turning process, thereby avoiding damage to the support plate 530 due to the weight and centrifugal force of the pork itself, and improving the service life of the support plate 530. The area of ​​the fresh pork hanging down on the support plate 530 due to its own gravity and contacting the side wall of the support plate 530 is reduced, so that the frozen pork can be easily taken out when unloading, thereby improving the unloading convenience of the cold chain logistics fresh-keeping box.

[0034] Embodiment 2 Although the S-shaped support plate 530 provides effective support for the pork, when the fresh pork is placed on the support plate 530, the pork will droop downward due to its own gravity and contact the side wall of the support plate 530. When the pork is frozen, the pork will adhere to the side wall of the support plate 530, affecting the subsequent unloading work of the operator. Therefore, the second embodiment further improves the first embodiment.

[0035] like Figure 4 As shown, each set of the placement device 500 further includes a connecting column 580, a gear 590, and a forward and reverse motor 511; The support plate 530 is rotatably connected to the load-bearing bar 520; Each of the load-bearing bars 520 has a cavity, and a plurality of connecting columns 580 are equidistantly connected to the cavity of the load-bearing bar 520, and each of the connecting columns 580 corresponds to a support plate 530, and the upper end of each connecting column 580 passes through the upper wall of the load-bearing bar 520 and is fixedly connected to the support plate 530, and the lower end of each connecting column 580 is rotatably connected to the inner bottom surface of the load-bearing bar 520; A gear 590 is fixedly connected to the outer periphery of each connecting column 580, and a plurality of the gears 590 in each load-bearing bar 520 are meshed with each other; A forward / reverse motor 511 is fixedly connected in the cavity opened in each of the load-bearing bars 520 , and a latching tooth is fixed on the periphery of the output shaft of the forward / reverse motor 511 . The latching tooth fixed on the periphery of the output shaft of the forward / reverse motor 511 is connected to a gear 590 in the load-bearing bar 520 .

[0036] A forward and reverse motor 511 is fixed in the inner cavity of the load-bearing bar 520, and a locking tooth is fixed on the outer periphery of the output shaft of the forward and reverse motor 511. The operation of the forward and reverse motor 511 causes a number of gears 590 and a connecting column 580 to rotate accordingly, thereby causing a number of support plates 530 on the upper wall of the load-bearing bar 520 to perform reciprocating circular rotation, thereby preventing fresh pork on the surface of the support plate 530 from sticking to the support plate 530 during the freezing process, thereby reducing the resistance of the support plate 530 to the pork block during the unloading process, making the unloading process more convenient, while also protecting the structure of the support plate 530 and improving the stability and service life of the placement device 500.

[0037] Embodiment 3 In order to further improve the smoothness of unloading the cold chain logistics fresh-keeping box, the third embodiment further improves the second embodiment.

[0038] like Figure 5 As shown, each set of the placement device 500 further includes a lifting motor 512, a force-bearing plate 513, and a through slot 514; Two lifting motors 512 are symmetrically fixedly connected to the inner bottom surface of each load-bearing bar 520, and the output shafts of the two lifting motors 512 pass through the upper wall of the load-bearing bar 520, and the output shafts of the two lifting motors 512 are slidably connected to the upper wall of the load-bearing bar 520; The output shafts of the two lifting motors 512 are fixedly connected to a rectangular parallelepiped force-bearing plate 513. When the support plate 530 is filled with pork, the height of the force-bearing plate 513 is lower than the height of the support plate 530. A plurality of circular through slots 514 are formed at equal intervals through the upper wall of the force-bearing plate 513 , and the plurality of through slots 514 correspond to the plurality of support plates 530 one by one.

[0039] When the cold chain logistics fresh-keeping box transports the pork to the designated location, the forward and reverse motors 511 are first started to make the gears 590 and the connecting column 580 rotate accordingly, so that the support plates 530 on the upper wall of the load-bearing bar 520 rotate back and forth in the through groove 514, thereby separating the frozen pork and the support plates 530. Then, the lifting motor 512 is started to lift the force plate 513 upward and exceed the height of the support plate 530, so that the frozen pork blocks on the surface of the support plates 530 are completely lifted up. Then the operator only needs to pull the frozen pork out directly, which further reduces the damage to the support plates 530 during the unloading of the frozen pork blocks, and also improves the convenience of loading and unloading goods in the cold chain logistics fresh-keeping box.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A fresh pork cold chain logistics preservation box, comprising a heat-insulating box (100), a transverse dividing plate (200), a storage chamber (300), a freezing chamber (400), and a placement device (500); The heat insulation box (100) is a rectangular parallelepiped structure, and a cavity is provided inside the heat insulation box (100); A transverse dividing plate (200) is fixedly connected to the cavity of the heat-insulating box (100); the transverse dividing plate (200) is in a rectangular shape, and the transverse dividing plate (200) divides the cavity of the heat-insulating box (100) into a storage cavity (300) and a freezing cavity (400); A plurality of groups of placement devices (500) are arranged in the storage cavity (300); It is characterized in that Each set of the placement devices (500) comprises a placement plate (510), a load-bearing bar (520), a support plate (530), and a hinged rope (540); A plurality of rectangular placement plates (510) are symmetrically fixedly connected to the inner wall of the storage cavity (300); The upper surface of the placement plate (510) is slidably connected to a plurality of rectangular load-bearing bars (520), and the load-bearing bars (520) are hollow structures; A plurality of support plates (530) are equidistantly and movably connected to each of the load-bearing bars (520); the support plates (530) are in an S-shape. When the support plates (530) are in an S-shape, their own support performance can be increased by their own curved shape. When the vehicle is turning, the support plates (530) may be over-extruded due to the centrifugal force. However, the S-shaped design of the support plates (530) can disperse the extrusion force by their own curved shape, thereby reducing the occurrence of bending of the support plates (530); Two hinge ropes (540) are symmetrically fixed between adjacent load-bearing bars (520), and the spacing between a plurality of load-bearing bars (520) can be adjusted by stretching the hinge ropes (540).

2. A fresh pork cold chain logistics preservation box as claimed in claim 1, characterized in that: Each set of the placement devices (500) further comprises a connecting column (580), a gear (590), and a forward and reverse motor (511); The support plate (530) is rotatably connected to the load-bearing bar (520); Each of the load-bearing bars (520) has a cavity formed therein, and a plurality of connecting columns (580) are equidistantly connected to the cavity of the load-bearing bar (520) by rotation, and each of the connecting columns (580) corresponds to a support plate (530), and the upper end of each connecting column (580) penetrates the upper wall of the load-bearing bar (520) and is fixedly connected to the support plate (530), and the lower end of each connecting column (580) is rotatably connected to the inner bottom surface of the load-bearing bar (520); A gear (590) is fixedly connected to the outer periphery of each connecting column (580), and the plurality of gears (590) are meshed with each other; A forward and reverse motor (511) is fixedly connected in the cavity opened in each load-bearing bar (520), and a latching tooth is fixed on the outer periphery of the output shaft of the forward and reverse motor (511), and the latching tooth fixed on the outer periphery of the output shaft of the forward and reverse motor (511) meshes with one of the gears (590).

3. A fresh pork cold chain logistics preservation box as claimed in claim 2, characterized in that: Each set of the placement devices (500) further comprises a lifting motor (512), a force-bearing plate (513), and a through slot (514); Two lifting motors (512) are symmetrically and fixedly connected to the bottom surface of the inner cavity of each load-bearing bar (520), the output shafts of the two lifting motors (512) penetrate the upper wall of the load-bearing bar (520), and the output shafts of the two lifting motors (512) are slidably connected to the upper wall of the load-bearing bar (520); The output shafts of the two lifting motors (512) are fixedly connected to a rectangular parallelepiped force-bearing plate (513); when the support plate (530) is filled with pork, the height of the force-bearing plate (513) is lower than the height of the support plate (530); A plurality of circular through slots (514) are equidistantly formed through the upper wall of the force-bearing plate (513), and the plurality of through slots (514) correspond one to one with the plurality of support plates (530).

4. A fresh pork cold chain logistics preservation box as claimed in claim 1, characterized in that: Each set of the placement devices (500) further comprises a pull rope (550), a rotating motor (560), and a transmission shaft (570); An inner wall on one side of the storage chamber (300) is fixedly connected to a rotating motor (560); The output shaft of the rotating motor (560) is fixedly connected to a transmission shaft (570), one end of the transmission shaft (570) away from the rotating motor (560) is rotatably connected to the side wall of the storage chamber (300), and the transmission shaft (570) is parallel to the load-bearing bar (520); Two pull ropes (550) are symmetrically arranged around the outer circumference of the transmission shaft, one end of the two pull ropes (550) is fixedly connected to the side wall closest to the load-bearing bar (520), and the other end of the two pull ropes (550) is fixedly connected to the load-bearing bar (520) at the farthest side.

5. A fresh pork cold chain logistics preservation box as claimed in claim 1, characterized in that: The transverse dividing plate (200) is provided with a plurality of vent holes (600) at equal intervals. The storage chamber (300) is located below the freezing chamber (400). When refrigerated air enters the freezing chamber (400), the cold air is heavier and can pass through the air holes (600) by its own weight and move into the storage chamber (300), thereby quickly freezing the pork.

6. A fresh pork cold chain logistics preservation box as claimed in claim 5, characterized in that: The fresh pork cold chain logistics preservation box also includes a vertical partition plate (700) and a refrigeration device (800); A rectangular vertical partition plate (700) is fixedly connected to the transverse partition plate (200), and the vertical partition plate (700) is located in the freezing chamber (400); A refrigeration device (800) is fixedly connected to the freezing chamber (400), and the refrigeration device (800) is located on a side of the vertical partition plate (700) away from the air vent (600).

7. A fresh pork cold chain logistics preservation box as claimed in claim 6, characterized in that: A plurality of gas transmission pipes (900) are equidistantly provided through the side wall of the vertical dividing plate (700).

8. A fresh pork cold chain logistics preservation box as claimed in claim 6, characterized in that: The fresh pork cold chain logistics preservation box also includes an air intake pipe (1100) and an exhaust pipe (1200); The upper wall of the heat-insulating box (100) is fixedly connected to an air intake pipe (1100), and the air intake pipe (1100) passes through the body of the heat-insulating box (100) and is in communication with the refrigeration device (800); The side wall of the heat insulation box (100) is fixedly connected to an exhaust pipe (1200), and the exhaust pipe (1200) passes through the outer wall of the heat insulation box (100) and is in communication with the storage chamber (300).

9. A fresh pork cold chain logistics preservation box as claimed in claim 8, characterized in that: Two locking tubes (1300) are fixed to a side wall of one side of the heat insulation box (100), and the two locking tubes (1300) are parallel to each other.

10. A fresh pork cold chain logistics preservation box as claimed in claim 9, characterized in that: Two placement tubes (1400) are fixedly connected to a side of the heat insulation box (100) away from the locking tube (1300), and the two placement tubes (1400) correspond to the two locking tubes (1300) one by one. The connection between the two heat insulation boxes (100) is achieved by engaging the placement tubes (1400) and the locking tubes (1300) of the two heat insulation boxes (100).

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