An inner support replaceable box structure

Abstract

The application discloses an inner support replaceable box structure and belongs to the technical field of transport box bodies. The inner support replaceable box structure comprises two boxes which are oppositely arranged, a hollow cavity is formed in the inside of the box, a matching block is fixedly arranged on the inner side wall of the cavity, a protection block is arranged in the cavity, the protection block is detachably connected with the matching block, and a pre-pressing structure is arranged in the matching block. The pre-pressing structure is used for generating pressure on the protection block and making the protection block elastically deform. The protection block is arranged in two boxes and can cooperate with each other. The pre-pressing structure is used for pre-pressing the protection block, and the protection block is elastically deformed. When the protection block shakes, the protection block can further elastically deform or return to the original state, so that the impact can be absorbed, and the stability of the material in the transportation process is improved.

Description

Technical Field

[0001] This invention relates to a box structure with replaceable internal support, belonging to the field of transport box technology. Background Technology

[0002] Currently, during the transportation of valuables, there is a common problem of damage caused by collisions between the goods and the packaging box due to external impacts and vibrations. The common solution is to fill the gap between the goods and the inner wall of the packaging box by setting internal supports to prevent the goods from colliding with the box.

[0003] The internal support of a conventional box is fixed, meaning that a single box can only accommodate one type of internal support. This results in poor compatibility with different types of internal supports. Furthermore, even with internal supports, there will still be situations where there is a hard impact. That is, the internal support first has a hard impact with the inner wall of the box, and only then does the internal support deform to provide cushioning. Therefore, it cannot directly provide effective cushioning for the items. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a box structure with replaceable internal support, which solves the problem in the prior art that the box has poor compatibility with different models of internal support, and cannot completely avoid hard impact conditions, and cannot directly provide effective cushioning for the object.

[0005] The technical problem to be solved by this invention is achieved by the following technical solution: a box structure with replaceable internal support, comprising: There are two boxes arranged opposite each other, and the interior of each box is hollow, forming a receiving cavity. The mating block is fixedly installed on the inner side wall of the receiving cavity. The protective block is housed within the receiving cavity, and the protective block and the mating block are detachably connected. The pre-compression structure is installed within the mating block. The pre-compression structure is used to apply pressure to the protective block and cause it to undergo elastic deformation. There are two protective blocks, which are located in two separate boxes and can cooperate with each other.

[0006] By adopting the above technical solution, protective blocks suitable for the shape of the material are selected and installed into the receiving cavity, so that the edge of the protective block is inserted into the mating block. This allows for the selection of different models of internal supports for installation, improving the adaptability of the shape to different models of internal supports. Then, the pre-compression structure applies pressure to the protective block in advance, causing the protective block to undergo elastic deformation. At this time, when the protective block shakes, it can further undergo elastic deformation or return to its original shape, thereby absorbing part of the impact and improving the stability of the material during transportation.

[0007] The invention is further configured such that: material mounting grooves are provided on the opposite surfaces of the two protective blocks, and assembly grooves and assembly blocks located on the side of the material mounting grooves are also provided on the opposite surfaces of the protective blocks, and the assembly groove of one protective block is aligned with the assembly block of the other protective block.

[0008] The present invention is further configured such that the pre-compression structure includes: The pressure groove is located on the outside of the housing and extends into the mating block. The airbag is embedded and fixed inside the pressure groove. The pressure block fits the inner contour of the opening of the pressure groove, and the end of the pressure block extends into the pressure groove to compress the airbag. The positioning part is installed inside the pressure groove to fix the pressure block. The expansion chamber is located on the side of the mating block and is connected to the airbag tubing. The expansion cavity is located in the direction that the mating block extends toward the inner wall of the receiving cavity, and a pre-compression expansion plate is fixed at the opening of the expansion cavity.

[0009] The present invention is further configured such that the positioning part includes: The positioning block is fixed to the opposite side wall of the pressure groove. The positioning groove is formed on the opposite side of the pressure block, and the positioning groove can match and engage with the positioning block.

[0010] By adopting the above technical solution, when the protective block is installed on the receiving cavity, the protective block and the mating block are inserted and mated. At this time, there is a gap at the insertion point of the mating block and the protective block, and the mating block does not exert pressure on the protective block. Therefore, the protective block will not undergo elastic deformation. At this time, the pressure block is inserted into the pressure groove. When the pressure block is fully inserted into the pressure groove, the positioning groove and the positioning block engage to restrict the movement of the pressure block. At the same time, the pressure block compresses the airbag, causing the gas in the airbag to enter the expansion chamber through the intermediate tube, causing the pre-compression expansion plate to expand outward. The expanded pre-compression expansion plate compresses the part where the protective block and the mating block meet. While filling the gap between the mating block and the protective block, positive pressure is applied to the connection between the protective block and the mating block, causing elastic deformation at the outer edge of the protective block. This allows the protective block to directly undergo elastic deformation to absorb the impact force when subjected to external impact, which is beneficial for protecting the objects transported inside the box.

[0011] The invention is further configured such that: a plurality of reinforcing partitions are fixed on the inner bottom wall of the receiving cavity, which are arranged in an alternating manner; the alternating reinforcing partitions are divided into a plurality of mounting grooves; and auxiliary components for pressing and abutting against the protective block are provided in the mounting grooves.

[0012] By adopting the above technical solution, the interlocking reinforcing partitions can improve the structural rigidity of the box when it is compressed, and improve the box's compressive strength.

[0013] The present invention is further configured such that the auxiliary component includes: The mounting block is inserted into the mounting slot. The auxiliary block is fixed on the side of the mounting block away from the mounting groove. The pressing block is located on the side of the auxiliary block facing the protective block. An adjusting screw is installed through the auxiliary block and its end is rotatably connected to the pressing block. The adjusting screw is threadedly connected to the through portion of the auxiliary block. A fastening structure, located within the auxiliary block and the mounting block, is used to secure the mounting groove to the mounting block. Several mounting blocks are arranged side by side along adjacent mounting slots, and these mounting blocks are fixed together with one auxiliary block.

[0014] The present invention is further configured such that the fastening structure includes: The air chamber is designed to be located on the mounting block within the mounting groove and is positioned facing the inner wall of the mounting groove. Secure the expansion tab to the opening of the inflation chamber and then seal the inflation chamber. The inflation section, located on the auxiliary block, is used to inflate the tightening inflation chamber. The expansion plate expands towards the inner wall of the mounting groove and then presses against the inner wall of the mounting groove.

[0015] The invention is further configured such that the inflation part includes: The fixing block is fixed to the side of the auxiliary block away from the mounting block. The inflation chamber is located within the auxiliary block. An inflatable plate is vertically slidably installed inside the inflation chamber, and the connection between the inflatable plate and the inner wall of the inflation chamber is sealed. An inflation screw has threads inside the fixed block. One end of the inflation screw is fixed to the inflation plate, and the other end extends to the outside of the fixed block. An air duct is installed inside the auxiliary block. One end of the air duct is connected to the inflation chamber, and the other end of the air duct extends into several mounting blocks and is connected to the fastening inflation chamber.

[0016] By adopting the above technical solution, after selecting a protective block of appropriate length and installing it into the receiving cavity, the mounting block is inserted into the mounting groove, while the pressing block faces the protective block. Once the mounting block is fully inserted into the mounting groove, the inflation screw is manually rotated, moving it towards the auxiliary block, thereby driving the inflation plate to move. This reduces the space inside the inflation chamber and increases the air pressure. Since the air guide pipe is connected to both the fastening inflation chamber and the inflation chamber, the air pressure inside the fastening inflation chamber increases synchronously, causing the fastening expansion plate to expand outwards. After expansion, the fastening expansion plate abuts against the reinforcing partition, thus increasing the pressure. The increased friction between the mounting block and the reinforcing partition prevents the mounting block from detaching from the mounting groove. Then, the adjusting screw is manually rotated, causing it to move axially under the action of the threaded connection. This pushes the pressing block towards the protective block, eventually abutting against the outer side of the protective block. As the adjusting screw rotates further, the pressing block applies pressure to the protective block, causing the outer edge of the protective block towards the pressing block to undergo elastic deformation. This allows the protective block to directly absorb the impact force through elastic deformation when subjected to external impact, further protecting the objects transported inside the container.

[0017] The beneficial effects of this invention are as follows: a protective block suitable for the shape of the material is selected and installed into the receiving cavity, so that the edge of the protective block is inserted into the mating block. This allows for the selection of different types of internal supports for installation, improving the adaptability of the shape to different types of internal supports. Then, the pre-compression structure applies pressure to the protective block in advance, causing the protective block to undergo elastic deformation. At this time, when the protective block shakes, it can further undergo elastic deformation or return to its original shape, thereby absorbing part of the impact and improving the stability of the material during transportation. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the structure of the present invention after the auxiliary components are installed; Figure 3 This is a schematic diagram of the structure when the pressing block and the protective block abut against each other after the two protective blocks are installed in this invention; Figure 4 This is a schematic diagram of the structure when the pressing block and the protective block abut against each other after a protective block is installed in this invention; Figure 5 This is a schematic diagram of the structure in which the protective block has an abutment plate. Figure 6 This is a schematic diagram of the auxiliary component in this invention; Figure 7 This is a cross-sectional view of the auxiliary component in this invention; Figure 8 This is a partial structural cross-sectional view of the mating point between the pressure block and the pressure groove in this invention; Figure 9 This is a partial structural diagram of the mating block in the present invention.

[0019] In the diagram: 10. Box body; 11. Receiving cavity; 12. Reinforcing partition; 13. Mating block; 14. Pressure groove; 15. Protective block; 16. Material installation groove; 17. Assembly groove; 18. Assembly block; 19. Abutment plate; 20. Auxiliary block; 21. Installation block; 22. Adjusting screw; 23. Guide rod; 24. Pressing block; 25. Fixing block; 26. Inflation screw; 27. Inflation chamber; 28. Inflation plate; 29. ​​Air guide pipe; 30. Fastening inflation chamber; 31. Fastening expansion plate; 32. Pressure block; 33. Positioning groove; 34. Airbag; 35. Intermediate tube; 36. Positioning block; 37. Pre-compression expansion plate. Detailed Implementation

[0020] To facilitate a clear understanding of the technical means, creative features, objectives, and effects of this invention, the invention will be further described below in conjunction with specific illustrations.

[0021] like Figure 1 , Figure 2 and Figure 9 As shown, a replaceable internal support box structure includes a box body 10, mating blocks 13, protective blocks 15, and a pre-compression structure. Two box bodies 10 are arranged opposite each other, and the interior of each box body 10 is hollow to form a receiving cavity 11. The two box bodies 10 abut against each other to form a complete outer box body. The mating blocks 13 are fixedly installed on the inner sidewall of the receiving cavity 11. Several mating blocks 13 are arranged side by side along the extension direction of the inner sidewall of the receiving cavity 11, and each mating block 13 extends from the bottom of the receiving cavity 11 toward the opening of the receiving cavity 11. The protective block 15 is disposed within the receiving cavity 11. The protective block 15 consists of an outer rectangular frame-shaped block and an inner rectangular block. The outer and inner blocks are fixed together by several staggered support plates. When the outer block is subjected to pressure from the housing 10, it deforms inward and compresses the support plates, causing the support plates to elastically deform. The outer block of the protective block 15 has a mating groove that can be detachably engaged with the mating block 13. The protective block 15 is fixed to the receiving cavity 11 through the tenon-and-mortise engagement between the mating block 13 and the mating groove. A pre-compression structure is disposed within the mating block 13. The pre-compression structure is used to generate pressure on the protective block 15 and to ensure that the protective block 15 continuously undergoes elastic deformation when not subjected to external forces.

[0022] like Figure 1As shown, two protective blocks 15 are provided and installed in two boxes 10 respectively, and the two protective blocks 15 can cooperate with each other. Material installation grooves 16 are opened on the opposite sides of the inner blocks of the two protective blocks 15. The material is placed in the material installation grooves 16. The material installation grooves 16 are symmetrically arranged laterally with assembly grooves 17 and assembly blocks 18. The assembly groove 17 of one protective block 15 is aligned with the assembly block 18 of the other protective block 15. When the two protective blocks 15 cooperate with each other, the assembly groove 17 of one protective block 15 is inserted into the assembly block 18 of the other protective block 15, and at the same time, the material installation grooves 16 of the two protective blocks 15 clamp and fix the material.

[0023] like Figure 2 , Figure 8 and Figure 9 As shown, the pre-compression structure includes a pressure groove 14, a pressure block 32, an air bladder 34, an expansion chamber, and a positioning part. The pressure groove 14 is formed on the outer side of the housing 10 and extends vertically into the mating block 13. The air bladder 34 is fixed inside the pressure groove 14 and is filled with gas, so that the internal air pressure of the air bladder 34 is slightly greater than atmospheric pressure. The fixing methods of the air bladder 34 include, but are not limited to: using adhesive bonding, and setting a protrusion in the pressure groove 14. The protrusion restricts the movement of the air bladder 34 by abutting, so that the air bladder 34 is embedded and fixed inside the pressure groove 14. The pressure block 32 fits into the inner contour of the opening of the pressure groove 14. The end of the pressure block 32 extends into the pressure groove 14 to compress the airbag 34. The expansion chamber is located laterally on the mating block 13 and is connected to the airbag 34 via a pipeline. The expansion chamber is located in the direction that the mating block 13 extends toward the inner wall of the receiving cavity 11. A pre-compression expansion plate 37 is fixed at the opening of the expansion chamber. The elastic modulus of the pre-compression expansion plate 37 is greater than that of the airbag 34, so that after the air pressure in the airbag 34 and the expansion chamber increases, the deformation of the airbag 34 is greater than that of the pre-compression expansion plate 37. A positioning part is provided in the pressure groove 14 to fix the position of the pressure block 32, so that the pressure block 32 cannot be removed from the pressure groove 14.

[0024] like Figure 2 and Figure 8 As shown, the positioning part includes a positioning groove 33 and a positioning block 36. The positioning block 36 is fixed to the opposite side wall of the pressure groove 14, and the positioning groove 33 is opened on the opposite side of the pressure block 32. After the pressure block 32 is inserted into the pressure groove 14, the positioning groove 33 can match and engage with the positioning block 36. At this time, the positioning block 36 is inserted into the positioning groove 33 to limit the movement of the pressure block 32 and prevent the pressure block 32 from coming out of the pressure groove 14.

[0025] like Figure 1 , Figure 3 and Figure 5As shown, the inner bottom wall of the receiving cavity 11 is fixed with several interleaved reinforcing partitions 12, which are divided into several mounting slots. Auxiliary components for pressing and abutting against the protective block 15 are installed in the mounting slots. The interleaved reinforcing partitions 12 improve the structural rigidity of the housing 10 under compression, thus increasing its compressive strength. The bottom of the protective block 15 is fixed with several abutment plates 19 that extend into the mounting slots. When the protective block 15 mates with the mating block 13, the abutment plates 19 insert into the mounting slots and abut against the reinforcing partitions 12. At this time, the abutment between the reinforcing partitions 12 and the abutment plates 19 provides horizontal abutment limitation for the protective block 15.

[0026] like Figures 3 to 7 As shown, the auxiliary assembly includes an auxiliary block 20, a mounting block 21, an adjusting screw 22, a pressing block 24, and a fastening structure. One end of the mounting block 21 is inserted into the mounting groove, and the other end of the mounting block 21 extends into the receiving cavity 11. Several mounting blocks 21 are arranged side by side along adjacent mounting grooves, preferably four. The auxiliary block 20 is fixed on the side of the mounting block 21 away from the mounting groove. Several mounting blocks 21 are fixed together with one auxiliary block 20, that is, preferably, the ends of four mounting blocks 21 extending into the receiving cavity 11 are fixed with only one horizontally extending auxiliary block 20. The pressing block 24 is located on the side of the auxiliary block 20 facing the protective block 15. An adjusting screw 22 passes through the auxiliary block 20 and its end is rotatably connected to the pressing block 24. The adjusting screw 22 is threadedly connected to the through portion of the auxiliary block 20. A knob for hand gripping and rotating is located at the end of the adjusting screw 22 away from the pressing block 24. A guide rod 23 is coaxially arranged on the radial side of the adjusting screw 22, axially passing through the auxiliary block 20 and slidingly abutting against it. One end of the guide rod 23 is fixed to the pressing block 24. A fastening structure is provided within the auxiliary block 20 and the mounting block 21 to fix the mounting groove to the mounting block 21. The fastening structure includes a fastening inflation chamber 30, a fastening expansion plate 31, and an inflation part. The fastening inflation chamber 30 is located on the portion of the mounting block 21 within the mounting groove and faces the inner wall of the mounting groove. The fastening expansion plate 31 is fixed to the opening of the fastening inflation chamber 30 and closes the chamber. After expanding towards the inner wall of the mounting groove, the fastening expansion plate 31 presses against the inner wall. The inflation part is located on the auxiliary block 20 and is used to inflate the fastening inflation chamber 30.

[0027] like Figures 6 to 7As shown, the inflation part includes a fixing block 25, an inflation screw 26, an inflation chamber 27, an inflation plate 28, and an air guide pipe 29. The fixing block 25 is fixed on the side of the auxiliary block 20 away from the mounting block 21. The inflation chamber 27 is opened in the auxiliary block 20. The inflation plate 28 is vertically slidably disposed in the inflation chamber 27. The connection between the inflation plate 28 and the inner wall of the inflation chamber 27 is sealed, so that the two spaces above and below the inflation plate 28 can be sealed and separated during the vertical sliding process of the inflation plate 28 in the inflation chamber 27. The space below the inflation plate 28 is filled with gas, and the space above the inflation plate 28 is connected to the external air pressure environment through the gap of the threaded fit. In the initial state, the gas pressure in the inflation plate 28 is slightly greater than the atmospheric pressure, and the fastening expansion plate 31 is in a slightly inflated state. The inflation screw 26 is threaded inside the fixing block 25, which is coaxially mounted with the inflation screw 26. One end of the inflation screw 26 is fixed to the inflation plate 28, and the other end extends to the outside of the fixing block 25. A knob for hand gripping and rotating is provided at the end of the inflation screw 26 extending outside the fixing block 25. An air guide tube 29 is located inside the auxiliary block 20. One end of the air guide tube 29 communicates with the inflation chamber 27, and the other end extends into several mounting blocks 21 and communicates with the fastening inflation chamber 30.

[0028] Select a protective block 15 with a suitable material shape and install it into the receiving cavity 11. The outer edge of the protective block 15, that is, the mating groove of the outer block of the protective block 15, is inserted and fixed with the mating block 13. This allows for the selection of different models of inner supports for installation, improving the adaptability of the shape to different models of inner supports. Then, the pre-compression structure applies pressure to the protective block 15 in advance, causing the entire protective block 15, as well as the support piece between the inner and outer blocks of the protective block 15, to undergo bending elastic deformation. At this time, when the protective block 15 shakes, it can directly undergo further elastic deformation or return to its original shape, thereby absorbing part of the impact and improving the stability of the material during transportation.

[0029] After the protective block 15 is installed onto the receiving cavity 11, the protective block 15 and the mating block 13 are inserted into each other. At this time, there is a gap at the insertion point of the mating block 13 and the protective block 15, and the mating block 13 does not exert pressure on the protective block 15, which facilitates the installation of the protective block 15 and the mating block 13. Therefore, the protective block 15 will not undergo elastic deformation. At this time, the pressure block 32 is inserted into the pressure groove 14. After the pressure block 32 is fully inserted into the pressure groove 14, the positioning groove 33 and the positioning block 36 engage to restrict the movement of the pressure block 32. At the same time, the pressure block 32 compresses the airbag 34, causing the gas in the airbag 34 to pass through the middle. The tube 35 enters the expansion chamber, causing the pre-compression expansion plate 37 to expand outward. The expanded pre-compression expansion plate 37 compresses the part where the protective block 15 and the mating block 13 meet. While filling the gap between the mating block 13 and the protective block 15, it applies positive pressure to the connection between the protective block 15 and the mating block 13, causing the outer edge of the protective block 15 to undergo bending elastic deformation. That is, the support plate between the inner and outer blocks of the protective block 15 undergoes bending deformation, so that when the protective block 15 is subjected to external impact, the support plate can directly undergo elastic deformation to absorb the impact force, which is beneficial to the protection of the transported objects in the box 10.

[0030] After selecting a suitable length of protective block 15 and installing it into the receiving cavity 11, insert the mounting block 21 into the mounting groove, while simultaneously positioning the pressing block 24 towards the protective block 15. Once the mounting block 21 is fully inserted into the mounting groove, manually rotate the inflation screw 26, causing it to move towards the auxiliary block 20, thereby moving the inflation plate 28. This reduces the space in the inflation chamber 27 and increases the air pressure. At this time, since the air guide pipe 29 is connected to both the fastening inflation chamber 30 and the inflation chamber 27, the air pressure in the fastening inflation chamber 30 increases synchronously, causing the fastening expansion plate 31 to expand outward. After expansion, the fastening expansion plate 31 abuts against the reinforcing partition 12, increasing the friction between the mounting block 21 and the reinforcing partition 12, preventing the mounting block 21 from detaching from the mounting groove. Then, manually rotate the adjusting screw 22, adjusting the screw 22 to the desired position. The axial movement of the press block 24, driven by the threaded connection, propels the press block 24 toward the protective block 15. During the movement of the press block 24, the guide rod 23 provides guidance, improving the accuracy of the press block 24's movement and ultimately causing the press block 24 to abut against the outer surface of the protective block 15. As the adjusting screw 22 rotates further, the press block 24 applies pressure to the protective block 15, primarily exerting pressure on the outer side of the protective block 15. This causes the support plate between the outer and inner sides of the protective block 15, and on the side facing the press block 24, to undergo bending elastic deformation. This allows the protective block 15 to directly absorb the impact force through elastic deformation when subjected to external impact. The combined bending elastic deformation of the support plate at the joint between the protective block 15 and the mating block 13 further enhances the protection of the transported objects inside the box 10.

[0031] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and various changes and modifications can be made without departing from the spirit and scope of the invention, all of which fall within the scope of protection claimed by the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A box structure with replaceable internal support, characterized in that: include: There are two boxes (10) arranged opposite each other. The inside of the boxes (10) is hollow to form a receiving cavity (11). The mating block (13) is fixedly installed on the inner side wall of the receiving cavity (11). A protective block (15) is disposed within the receiving cavity (11), and the protective block (15) is detachably connected to the mating block (13). The pre-compression structure is set inside the mating block (13). The pre-compression structure is used to generate pressure on the protective block (15) and cause the protective block (15) to undergo elastic deformation. There are two protective blocks (15) and they are located in two boxes (10) respectively. The two protective blocks (15) can cooperate with each other.

2. The box structure with replaceable internal support according to claim 1, characterized in that: Material mounting grooves (16) are provided on the opposite sides of the two protective blocks (15). The opposite sides of the protective blocks (15) are also provided with assembly grooves (17) and assembly blocks (18) located on the side of the material mounting grooves (16). The assembly groove (17) of one protective block (15) is aligned with the assembly block (18) of the other protective block (15).

3. The box structure with replaceable internal support according to claim 1, characterized in that: The pre-compression structure includes: Pressure groove (14) is formed on the outside of housing (10) and extends into mating block (13). The airbag (34) is embedded and fixed inside the pressure groove (14). The pressure block (32) fits the inner contour of the opening of the pressure groove (14), and the end of the pressure block (32) extends into the pressure groove (14) to compress the airbag (34). The positioning part is set in the pressure groove (14) to fix the pressure block (32). The expansion chamber is located on the side of the mating block (13) and is connected to the airbag (34) pipeline. The expansion cavity is located in the direction of the mating block (13) extending toward the inner wall of the receiving cavity (11), and a pre-compression expansion plate (37) is fixed at the opening of the expansion cavity.

4. The box structure with replaceable internal support according to claim 3, characterized in that: The positioning unit includes: The positioning block (36) is fixed to the opposite side wall of the pressure groove (14). The positioning groove (33) is provided on the opposite side of the pressure block (32), and the positioning groove (33) can be matched and engaged with the positioning block (36).

5. A box structure with replaceable internal support according to claim 1, characterized in that: The inner bottom wall of the receiving cavity (11) is fixed with several reinforcing partitions (12) arranged in an alternating manner. The alternating reinforcing partitions (12) are divided into several mounting slots, and auxiliary components for pressing and contacting the protective block (15) are provided in the mounting slots.

6. The box structure with replaceable internal support according to claim 5, characterized in that: The auxiliary components include: The mounting block (21) is inserted into the mounting slot. The auxiliary block (20) is fixed on the side of the mounting block (21) away from the mounting groove. The pressing block (24) is located on the side of the auxiliary block (20) facing the protective block (15). An adjusting screw (22) is provided through the auxiliary block (20) and its end is rotatably connected to the pressing block (24). The adjusting screw (22) and the through part of the auxiliary block (20) are threadedly connected. A fastening structure, provided within the auxiliary block (20) and the mounting block (21), is used to fix the mounting groove to the mounting block (21). Among them, several mounting blocks (21) are arranged side by side along adjacent mounting slots, and several mounting blocks (21) are fixed together with an auxiliary block (20).

7. A box structure with replaceable internal support according to claim 6, characterized in that: The fastening structure includes: The air chamber (30) is fastened and is located in the mounting slot of the mounting block (21) and faces the inner wall of the mounting slot. The expansion plate (31) is fastened and fixed at the opening of the air-tightening cavity (30) to close the air-tightening cavity (30). An inflation section, mounted on the auxiliary block (20), is used to inflate the air-tightening cavity (30). Among them, the fastening expansion piece (31) expands towards the inner wall of the mounting groove and presses against the inner wall of the mounting groove.

8. A box structure with replaceable internal support according to claim 7, characterized in that: The inflation section includes: The fixing block (25) is fixed to the side of the auxiliary block (20) away from the mounting block (21). The air chamber (27) is located within the auxiliary block (20). An inflatable plate (28) is vertically slidably installed inside the inflation chamber (27), and the connection between the inflatable plate (28) and the inner wall of the inflation chamber (27) is sealed. An inflation screw (26) is threaded inside a fixing block (25). One end of the inflation screw (26) is fixed to an inflation plate (28), and the other end of the inflation screw (26) extends to the outside of the fixing block (25). An air guide tube (29) is set inside an auxiliary block (20). One end of the air guide tube (29) is connected to the inflation chamber (27), and the other end of the air guide tube (29) extends into several mounting blocks (21) and is connected to the fastening inflation chamber (30).

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