Cylinder body packaging box

Abstract

The utility model relates to the technical field of cylinder body packaging, and discloses a cylinder body packaging box which comprises an outer packaging layer and an inner packaging part arranged in the outer packaging layer, an anti-collision space is formed between the inner packaging part and the outer packaging layer, a plurality of containing cavities which are communicated up and down and used for containing cylinder bodies are formed in the inner packaging part, and the inner packaging layer is arranged in the containing cavities. The inner packaging part is connected with an upper limiting structure and a lower limiting structure which are used for limiting movement of the cylinder bodies in the containing cavities in all directions. The upper limiting structure and the lower limiting structure are arranged on the inner packaging part, so that the lower limiting structure limits the bottom of the cylinder body, and meanwhile, the lower limiting structure limits the freedom degree of the cylinder body in the first direction and the second direction to a certain extent; the upper limiting structure is pressed on the cylinder body to limit the cylinder body to move in the first direction or the second direction to a certain extent, and meanwhile, the upper limiting structure is matched with the lower limiting structure to limit the cylinder body to move up and down, so that the cylinder body is protected and fixed in all directions.

Description

Technical Field

[0001] This utility model relates to the field of cylinder packaging technology, and in particular to a cylinder packaging box. Background Technology

[0002] The cylinder block, also known as the engine block, is the "skeleton" of the engine, serving as the assembly base for all its mechanisms and systems. All major engine components are housed inside and outside the cylinder block, and it bears various loads. It is the primary conduit for engine coolant and oil. Therefore, the cylinder block possesses sufficient strength and rigidity to ensure the normal operation of the engine.

[0003] The cylinder block is typically a complex-shaped, thin-walled box-like part, usually hexahedral in shape and characterized by its porous, thin walls. Nowadays, to meet the demand for engine cylinder blocks in various regions, they need to be packaged and transported for use. To ensure the integrity of the cylinder block during packaging and transportation, and to prevent damage from bumps and jolting during transport, which could affect its quality and appearance, extra padding is usually used inside the packaging box to secure the cylinder block and separate it from the box. However, the use of padding increases costs, is cumbersome to prepare, and, to prevent damage to the cylinder block, the padding is usually flexible. Flexible padding is constantly affected by bumpy transport conditions, causing slight loosening of the cylinder block and resulting in relatively poor securing. Utility Model Content

[0004] In view of the shortcomings of the prior art, the technical problem to be solved by this utility model is to provide a cylinder packaging box to solve the problems of increased cost and poor fixing effect caused by the use of filler to fix the cylinder in the existing cylinder packaging boxes.

[0005] To solve the above-mentioned technical problems, the present invention provides a cylinder packaging box including an outer packaging layer and an inner packaging part disposed within the outer packaging layer. An anti-collision space is formed between the inner packaging part and the outer packaging layer. Several vertically connected placement cavities for placing cylinders are formed within the inner packaging part. An upper limit structure and a lower limit structure are connected to the inner packaging part to restrict the movement of cylinders in each placement cavity in all directions.

[0006] Furthermore, the upper limit structure is connected to the top of the inner packaging section, and the upper limit structure has an upper pressing part extending from the top into the placement cavity. An upper pressing groove adapted to the top contour of the cylinder body is recessed on the upper pressing part for pressing against the top of the cylinder body.

[0007] Furthermore, the bottom of the upper limit structure is inserted into the top of the inner packaging section, and the top of the upper limit structure abuts against the outer packaging layer.

[0008] Furthermore, the lower limiting structure includes a base plate disposed within the outer packaging layer and supporting the bottom of the inner packaging section, and a lower limiting part extending from the bottom into the placement cavity to support the cylinder body. The lower limiting part has a limiting groove recessed in the middle for the bottom of the cylinder body to be inserted into when the cylinder body is supported on the lower limiting part. The limiting groove is located below the upper pressing groove.

[0009] Furthermore, the inner packaging section includes a plurality of first card slots and a plurality of second card slots, each of the first card slots being cross-connected to each of the second card slots spaced apart along a second direction, so as to enclose a plurality of placement cavities arranged in a rectangular array.

[0010] Furthermore, the upper limit structure is divided into multiple parts corresponding to the position and number of the placement cavity in the second direction and distributed along the second direction. Each upper limit structure is inserted into each of the first card plates it passes through in a straight line along the first direction, and each upper limit structure has the upper pressure part at the position corresponding to each placement cavity it passes through in the first direction.

[0011] Furthermore, after the two ends of each of the first and second card slot plates are cross-jointed, an end plate is formed for supporting the outer packaging layer, and the end plate creates the anti-collision space between the inner packaging part and the outer packaging layer.

[0012] Furthermore, both ends of each of the upper limit structures extend backward and are flush with the end plate on the side to extend into the anti-collision space, and both ends of the upper limit structure abut against the outer packaging layer.

[0013] Furthermore, the outer packaging layer includes a tray, a bottom cover supported on top of the tray, a side panel supported on the inside of the bottom cover to surround the outside of the inner packaging section, and an upper cover covering the top of the side panel. The upper limit structure is flush with the top of the side panel and abuts against the upper cover.

[0014] Furthermore, the tray includes several bases that are parallel and spaced apart along a first direction or a second direction, and several support strips that are spaced apart and connected to the top surface of the bases in a grid-like manner along a direction perpendicular to the bases. The bottom cover is supported on the support strips, and a through space is formed between adjacent bases.

[0015] The cylinder packaging box of this utility model has at least the following beneficial effects: by setting an upper limit structure and a lower limit structure on the inner packaging part, the lower limit structure restricts the bottom of the cylinder, and at the same time, the lower limit structure restricts the cylinder's degree of freedom in the first and second directions to a certain extent. The upper limit structure presses on the cylinder to restrict the cylinder's movement in the first or second direction to a certain extent. At the same time, the upper limit structure works with the lower limit structure to restrict the cylinder's vertical movement, so as to achieve all-round cylinder protection and fixation. The upper limit structure and the lower limit structure cooperate with the inner packaging part through splicing and other methods, which can make the cylinder fixation more stable and firm than using filler. Attached Figure Description

[0016] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0017] Figure 1 This is a schematic diagram of the cylinder packaging box of this utility model;

[0018] Figure 2 This is an exploded view of the cylinder body packaging box of this utility model;

[0019] Figure 3 This is a schematic diagram of the structure of the cylinder packaging box of this utility model after the top cover is hidden.

[0020] Figure 4 This is an exploded view of the inner packaging section and the upper limit structure of this utility model;

[0021] Figure 5 This is an unfolded diagram of the upper limit structure of this utility model.

[0022] The meanings of the labels in the attached diagram are as follows:

[0023] Outer packaging layer 1, tray 11, base 111, support strip 112, through space 113, bottom cover 12, bottom plate 121, bottom side plate 122, surrounding plate 13, top cover 14, inner packaging section 2, first card slot plate 21, first insertion port 211, groove 212, fourth insertion port 213, second card slot plate 22, second insertion port 221, placement cavity 23, end plate 241, anti-collision space 25, upper limit structure 3, upper pressure part 31, upper pressure groove 32, third insertion port 33, first notch 341, second notch 342, first fold line 343, second fold line 344, first side 345, second side 346, third side 347, lower limit structure 4, bottom plate 41, lower limit part 42, limit groove 43. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings.

[0025] Please refer to Figures 1 to 5 The cylinder packaging box of this utility model includes an outer packaging layer 1, an inner packaging section 2 disposed within the outer packaging layer 1, an upper limit structure 3 connected to the inner packaging section 2, and a lower limit structure 4 connected to the inner packaging section 2. The outer packaging layer 1 provides support and protection for the inner packaging section 2, the upper limit structure 3, and the lower limit structure 4, while also facilitating packing, tying, and transportation. The inner packaging section 2 forms several interconnected placement cavities 23 for placing the cylinders. By spacing the cylinders from the outer packaging layer 1, the impact on the cylinders during transportation is reduced due to collisions with the outer packaging layer 1, thus forming double-layer protection and providing better and more stable placement of the cylinders. The upper limit structure 3 is used to hold the cylinders in place, preventing them from jumping and, to a certain extent, restricting their lateral movement. The lower limit structure 4 is used to support the cylinder body, providing a certain degree of bottom support and cushioning. At the same time, after the cylinder body is installed on it, the lower limit structure 4 can limit the cylinder body's swaying and lateral movement. Together with the upper limit structure 3, it can achieve all-round fixation of the cylinder body, so as to better protect the cylinder body and improve the transportation stability of the cylinder body.

[0026] Please refer to Figures 1 to 3 In this embodiment, the outer packaging layer 1 includes a tray 11, a bottom cover 12 supported on the top of the tray 11, a surrounding panel 13 supported on the inside of the bottom cover 12 to surround the outside of the inner packaging section 2, and an upper cover 14 covering the top of the surrounding panel 13. The tray 11 is used to support other structures of the packaging box and the cylinder. The bottom cover 12 is used to support the inner packaging section 2 and the surrounding panel 13 to facilitate the installation of the surrounding panel 13 and the inner packaging section 2. The upper cover 14 cooperates with the surrounding panel 13 to wrap the inner packaging section 2 and the cylinder inside the outer packaging layer 1. At the same time, the upper cover 14 is used for the removal and placement of the upper limit structure 3 and the cylinder.

[0027] In this embodiment, the tray 11 includes several bases 111 spaced parallel to each other along a first direction and several support bars 112 spaced apart and connected to the top surface of the bases 111 along a second direction perpendicular to the bases 111. The bases 111 and support bars 112, when connected, form a grid shape. The bottom cover 12 is supported on the support bars 112, thus separating the bottom cover 12 from the ground or any platform, preventing damage to the cylinder inside the packaging box from ground impact during lifting and lowering. In this embodiment, the bases 111 are rectangular parallelepipeds, with each base 111 having the same length, width, and height, and both ends aligned. Each support bar 112 is also a rectangular parallelepiped with the same length, width, and height. After connection, each support bar 112 is evenly spaced, aligned at both ends, and flush with the sides of the two outermost bases 111 in the first direction. Similarly, each base 111 is evenly spaced, aligned at both ends, and flush with the sides of the two outermost bases 111 in the second direction. In this embodiment, a through-space 113 is formed between any two adjacent bases 111. This through-space facilitates the passage of packing ropes to pack the boxes. Simultaneously, the through-space 113 also allows for the passage of forks from transfer equipment such as forklifts during transport, facilitating the movement of the boxes within the packaging cylinder. Because the cylinder has a certain weight, the pallet 11 is made of a high-rigidity, hard material such as plywood or alloy. In another embodiment, several bases 111 are distributed parallel to each other along a second direction, and several support bars 112 are connected parallel to each other along a first direction on the top surface of the bases 111.

[0028] In this embodiment, the bottom cover 12, the surrounding panel 13, the top cover 14, the inner packaging section 2, the upper limit structure 3, and the lower limit structure 4 are all made of corrugated cardboard, which is not only low in cost but also energy-saving, environmentally friendly, and recyclable. The bottom cover 12 includes a rectangular bottom plate 121 and bottom side plates 122 formed by folding the four sides of the bottom plate 121 upwards. Adjacent bottom side plates 122 are connected by adhesive, nailing, or other methods. The height of the bottom side plates 122 is much smaller than the height of the surrounding panel 13. Each bottom side plate 122 surrounds a bottom space between the bottom plate 41, which is adapted to the surrounding panel 13 so that the bottom fabric of the surrounding panel 13 can be inserted. In another embodiment, the bottom cover 12, the surrounding panel 13, the top cover 14, the inner packaging section 2, the upper limit structure 3, and the lower limit structure 4 can also be made of materials such as wood or alloy, and are not limited to this embodiment.

[0029] In this embodiment, the enclosure 13 has four side panels corresponding to the four bottom side panels 122. The four side panels are adjacent to each other end to end. The enclosure 13 is formed by folding a rectangular corrugated cardboard. A connecting portion is retained on one section of the corrugated cardboard, and the other parts of the corrugated cardboard are folded to form the four side panels. The connecting portion is connected to the side panel at the other end to form the enclosure 13. After the bottom of the enclosure 13 is placed in the bottom space, each enclosure 13 is attached to each bottom side panel 122.

[0030] In this embodiment, the method of setting the upper cover 14 is the same as that of the bottom cover 12, and it surrounds a top space that is the same as the bottom space and the opening side is located on the opposite side. The upper cover 14 covers the top of the surrounding plate 13 through the top space, and the top of the surrounding plate 13 extends into the top space and abuts against the upper cover 14.

[0031] In this embodiment, the inner packaging section 2 includes several first card slot plates 21 and several second card slot plates 22. The first card slot plates 21 and second card slot plates 22 are connected to each other in a cross-interlocking manner to enclose several placement cavities 23. The cylinder is placed in each placement cavity 23 according to the number of placement cavities 23. In use, after the assembled inner packaging section 2 is placed on the bottom cover 12 and located inside the surrounding plate 13, the cylinder is placed in the placement cavities 23 in sequence. The inner packaging section 2 provides secondary protection and initial positioning of the cylinder relative to the surrounding plate 13. In one embodiment, each first card slot plate 21 is parallel to each other and equally spaced along a first direction, and each second card slot plate 22 is parallel to each other and equally spaced along a second direction. The length direction of each first card slot plate 21 is parallel to the second direction, and the length direction of each second card slot plate 22 is parallel to the first direction. Each first card slot plate 21 is cross-interlocked with each second card slot plate 22 to enclose several placement cavities 23 arranged in a rectangular array. In another embodiment, the first card slot plates 21 are parallel to each other and equally spaced along a second direction, and the second card slot plates 22 are parallel to each other and equally spaced along a first direction. The length direction of each first card slot plate 21 is parallel to the first direction, and the length direction of each second card slot plate 22 is parallel to the second direction. Each first card slot plate 21 is cross-shapedly inserted into each second card slot plate 22 to similarly enclose a plurality of rectangular arrayed placement cavities 23. In this embodiment, each first card slot plate 21 and each second card slot plate 22 is rectangular, and the length, width, and height of each first card slot plate 21 are the same, as are the length, width, and height of each second card slot plate 22.

[0032] In one embodiment, the first card slot plate 21 and the second card slot plate 22 are each provided in triplicate. A first insertion port 211 is recessed at the top of the first card slot plate 21 at a position corresponding to that of each of the second card slot plates 22. All three first insertion ports 211 penetrate the first card slot plate 21 in a direction perpendicular to it and are connected upwards. At the bottom of each second card slot plate 22, corresponding to a position on the first card slot plate 21, a second insertion port 221 is recessed, adapted to the first insertion port 211. All three second insertion ports 221 penetrate the second card slot plate 22 in a direction perpendicular to it and are connected downwards. The sum of the lengths of the first insertion ports 211 and the second insertion ports 221 is equal to the heights of the first card slot plate 21 and the second card slot plate 22. During assembly, the three first card slots 21 are inserted into one of the second slots 221 of the three second card slots 22 through the three first insertion ports 211 to form a cross shape. This results in all the first card slots 21 and second card slots 22 being cross-connected to form the inner packaging section 2, which encloses four placement cavities 23. The number of first card slots 21 and second card slots 22 is not limited to this embodiment; other numbers of first card slots 21 and second card slots 22 can also be used, but it must be ensured that at least two pieces of each first card slot 21 and second card slot 22 are used to ensure that at least one placement cavity 23 is formed. After being inserted through the first insertion ports 211 and second insertion ports 221, the tops and bottoms of the first card slots 21 and second card slots 22 are flush.

[0033] In this embodiment, to prevent the enclosure 13 from excessively affecting the cylinder inside the placement cavity 23 due to collisions with the outer shell during transportation, an end plate 241 is formed at the two ends of each first retaining plate 21 and each second retaining plate 22 after being cross-connected. This end plate 241 is located outside each placement cavity 23, i.e., outside the inner packaging section 2. When the enclosure 13 is placed on the inner packaging section 2, the end plate 241 abuts against the inner side of the enclosure 13 of the outer packaging layer 1. While providing support between the enclosure 13 and the inner packaging section 2, the end plate 241 also forms the anti-collision space 25 between the inner packaging section 2 and the outer packaging layer 1, so that the enclosure 13 and the portions of each first retaining plate 21 and second retaining plate 22, excluding the end plate 241, are spaced apart, thereby greatly reducing the impact on the cylinder when the enclosure 13 is bumped.

[0034] Please refer to Figures 2 to 5In this embodiment, the upper limit structure 3 is connected to the top of the inner packaging section 2, and can be connected by adhesive or by insertion. The upper limit structure 3 is a cuboid or square tube structure. The upper limit structure 3 has an upper pressing part 31 that extends from the top into the placement cavity 23. After the upper limit structure 3 is connected to the inner packaging section 2, the upper pressing part 31 extends downwards from the top of the placement cavity 23 into the placement cavity 23. An upper pressing groove 32, adapted to the contour of the top of the cylinder, is recessed on the upper pressing part 31 to press against the top of the cylinder. After the cylinder is installed in the placement cavity 23, the upper limit structure 3 is connected to the inner packaging part 2. At this time, the upper pressing groove 32 presses against the top of the cylinder along the contour of the top of the cylinder, so as to effectively press down the cylinder and limit the vertical movement of the cylinder. At the same time, since the top shape of the cylinder is not flat, the upper pressing groove 32, which is adapted to its contour, can effectively fix the cylinder after the upper limit structure 3 is fixed, thus preventing the cylinder from moving in the first and second directions to a certain extent. In this embodiment, the directions where the first and second directions are located are defined as the lateral directions.

[0035] In this embodiment, the bottom of the upper limit structure 3 is inserted into the top of the inner packaging section 2 in a straight line, so that the upper limit structure 3 can be easily installed or removed from the inner packaging section 2. After the upper limit structure 3 is inserted into the inner packaging section 2, the top of the upper limit structure 3 is flush with the top of the surrounding plate 13, so that the top of the upper limit part abuts against the outer packaging layer 1. After the outer packaging layer 1 completes the packaging, the outer packaging layer 1 can press and fix the upper limit structure 3, thereby preventing the inserted upper limit structure 3 from falling off, ensuring the stability of the upper limit structure 3 and improving the fixing effect on the cylinder body.

[0036] In this embodiment, the upper limit structure 3 is divided into multiple positions and numbers corresponding to the placement cavities 23 in the second direction and distributed along the second direction. Each upper limit structure 3 is inserted into each of the first card plates 21 it passes through in a straight line along the first direction, and each upper limit structure 3 has the aforementioned upper pressing part 31 at the position corresponding to each placement cavity 23 it passes through in the first direction. For example, in an embodiment where both the first card plate 21 and the second card plate 22 are set to three pieces, each placement cavity 23 parallel to the first direction is regarded as a row, and each placement cavity 23 parallel to the second direction is regarded as a column. That is, each placement cavity 23 has two rows and two columns, with two rows of placement cavities 23 distributed sequentially in the second direction and two columns of placement cavities 23 distributed sequentially in the first direction. The upper limit structure 3 corresponds to two rows of placement cavities 23. The two upper limit structures 3 are respectively positioned at the locations of the two rows of placement cavities 23. The length direction of each upper limit structure 3 is arranged along the first direction and passes through the two columns of placement cavities 23. Correspondingly, each upper limit structure 3 forms two upper pressure parts 31 corresponding to the two columns of placement cavities 23, and each upper pressure part 31 has an upper pressure groove 32, resulting in a total of four upper pressure parts 31 and four upper pressure grooves 32. In one embodiment, when the placement cavities 23 are set to three rows and two columns, the upper limit structure 3 is set to three, with each upper limit structure 3 forming two upper pressure parts 31, resulting in a total of six upper pressure parts 31 and six upper pressure grooves 32.

[0037] In this embodiment, a third insertion port 33 is formed at the bottom of each upper limit structure 3 at a position corresponding to each first card plate 21, and the third insertion port 33 is open downwards. A groove 212 is recessed on each first card plate 21 at a position corresponding to the upper limit structure 3, into which the bottom of the upper limit structure 3 extends. A fourth insertion port 213 is formed on the groove 212 at a position corresponding to the third insertion port 33, and is adapted to and inserted into the third insertion port 33 in a straight line. The fourth insertion port 213 penetrates the first card plate 21 along a first direction and opens upwards. When the bottom of the upper limit structure 3 extends into the groove 212 and the third insertion port 33 is inserted into the fourth insertion port 213, the top surface of the upper limit structure 3 is flush with the top side of the surrounding plate 13. Simultaneously, the upper pressure groove 32 presses against the top of the cylinder body inside the placement cavity 23. Each upper limit structure 3 has three third slots 33 corresponding to the three first card plates 21, and each first card plate 21 has two grooves 212 corresponding to the two upper limit structures 3, with two fourth slots 213 in each groove 212.

[0038] To facilitate the insertion between the upper limit structure 3 and each inner packaging section 2, and to improve the stability of the upper limit structure 3, both ends of each upper limit structure 3 extend backward along the first direction and are flush with the end plates 241 on both sides of the second card plate 22 distributed along the first direction, so that both ends of each upper limit structure 3 extend into the anti-collision space 25 distributed on both sides of the inner packaging section 2 along the first direction, and the width of the end of the upper limit structure 3 extending into the anti-collision space 25 is the same as the width of the end plate 241, so that both ends of the upper limit structure 3 abut against the outer packaging layer 1.

[0039] In this embodiment, the upper limit structure 3 is formed by folding a rectangular corrugated cardboard. A square first notch 341 is symmetrically formed on the corrugated cardboard along its center axis at positions corresponding to the placement cavity 23 on both sides along the second direction. A second notch 342 is symmetrically formed on both sides along the second direction at positions corresponding to each first card plate 21. A first fold line 343 is formed along the first direction with the opposite side of each first notch 341. Two second fold lines 344 are symmetrically formed on the corrugated cardboard along the second direction away from the first fold line 343, dividing the corrugated cardboard into a first side 345, two second sides 346, and two third sides 347. The two second sides 346 are folded along the two first fold lines 343 to extend in the same direction. Then, they are folded along the second fold lines 344 from the two second sides 346 to make the two third sides 347 extend towards each other and overlap, thus forming the upper limit structure 3. Each first notch 341 forms an upper pressure groove 32, and each second notch 342 forms a third insertion slot 33. The two fourth sockets 213 in each groove 212 are respectively inserted into the two second side plates 346 corresponding to each third socket 33, and the top side of the groove 212 abuts against the first side plate 345.

[0040] Please refer to Figure 2The lower limiting structure 4 includes a base plate 41 disposed within the outer packaging layer 1 and supporting the bottom of the inner packaging section 2, and a lower limiting part 42 extending from the bottom of the placement cavity 23 into the placement cavity 23 to support the cylinder body. In this embodiment, the base plate 41 has a rectangular structure and its length and width are consistent with the bottom space so that it can be placed into the bottom space. The lower limiting part 42, which protrudes upward from the base plate 41, is fixedly connected to the base plate 41 at the positions corresponding to each placement cavity 23. The lower limiting part 42 has a rectangular structure and its length and width are corrugated cardboard adapted to the length and width of the placement cavity 23, so that after the base plate 41 is placed in the bottom space and the surrounding plate 13 and the inner packaging section 2 are installed, the lower limiting part 42 penetrates into the bottom of the placement cavity 23 from bottom to top. The cylinder body is supported on the lower limiting part 42 during installation. The lower limiting part 42 increases the distance between the cylinder body and the bottom plate 121, increases the thickness of the lower limiting structure 4, and improves the support strength. To further secure the bottom of the cylinder and to accommodate the convex structure at the bottom of the cylinder, a limiting groove 43 is recessed from the top surface in the middle of the lower limiting part 42. This groove is used to allow the bottom of the cylinder to engage when the cylinder is supported on the lower limiting part 42. The limiting groove 43 is located below the upper pressing groove 32. The four lower limiting grooves 43 of the four lower limiting parts 42 correspond to the four upper pressing grooves 32. The lower limiting parts 42 support the cylinder upwards, causing the cylinder to abut against the upper pressing grooves 32, thus facilitating the restriction of the cylinder in the vertical direction. At the same time, the upper limiting part restricts the cylinder's degree of freedom in the lateral direction through the limiting grooves 43. Due to the limited space of the placement cavity 23 and the pressure of the upper pressing grooves 32, the cylinder cannot tilt or rotate, thus achieving full positioning of the cylinder. The inner packaging part 2, the upper limiting part, and the lower limiting part 42 separate the cylinder from the outer packaging layer 1, greatly reducing the impact on the cylinder from all directions.

Claims

1. A cylinder packaging box, comprising an outer packaging layer and an inner packaging section disposed within the outer packaging layer, wherein an anti-collision space is formed between the inner packaging section and the outer packaging layer, and the inner packaging section contains a plurality of vertically connected placement cavities for placing cylinders, characterized in that: The inner packaging section is connected to an upper limit structure and a lower limit structure for omnidirectionally restricting the movement of the cylinders in each placement cavity.

2. The cylinder packaging box as described in claim 1, characterized in that: The upper limit structure is connected to the top of the inner packaging part. The upper limit structure has an upper pressing part that extends from the top into the placement cavity. An upper pressing groove that is adapted to the top contour of the cylinder body is provided on the upper pressing part for pressing against the top of the cylinder body.

3. The cylinder packaging box as described in claim 2, characterized in that: The bottom of the upper limit structure is inserted into the top of the inner packaging section, and the top of the upper limit structure abuts against the outer packaging layer.

4. The cylinder packaging box as described in claim 2, characterized in that: The lower limit structure includes a base plate disposed inside the outer packaging layer and supporting the bottom of the inner packaging section, and a lower limit part extending from the bottom into the placement cavity to support the cylinder body. The lower limit part has a recessed groove in the middle for the bottom of the cylinder body to be inserted into when the cylinder body is supported on the lower limit part. The lower limit groove is located below the upper pressure groove.

5. The cylinder packaging box as described in claim 2, characterized in that: The inner packaging section includes a plurality of first card slots and a plurality of second card slots. Each of the first card slots is cross-connected to each of the second card slots that are spaced apart along a second direction, so as to form a plurality of placement cavities arranged in a rectangular array.

6. The cylinder packaging box as described in claim 5, characterized in that: The upper limit structure is divided into multiple parts corresponding to the position and number of the placement cavity in the second direction and distributed along the second direction. Each upper limit structure is inserted into each of the first card plates along the first direction in a straight line, and each upper limit structure has the upper pressure part at the position corresponding to each placement cavity passed in the first direction.

7. The cylinder packaging box as described in claim 6, characterized in that: The two ends of each of the first and second card slots are cross-joined to form an end plate for supporting the outer packaging layer, and the end plate creates the anti-collision space between the inner packaging and the outer packaging layer.

8. The cylinder packaging box as described in claim 7, characterized in that: Both ends of each of the upper limit structures extend backward and are flush with the end plate on the side to extend into the anti-collision space, and both ends of the upper limit structure abut against the outer packaging layer.

9. The cylinder packaging box as described in claim 2, characterized in that: The outer packaging layer includes a tray, a bottom cover supported on top of the tray, a side panel supported on the inside of the bottom cover to surround the outside of the inner packaging section, and an upper cover covering the top of the side panel. The upper limit structure is flush with the top of the side panel and abuts against the upper cover.

10. The cylinder packaging box as described in claim 9, characterized in that: The tray includes several bases that are parallel and spaced apart along a first direction or a second direction, and several support strips that are spaced apart and connected to the top surface of the bases in a grid-like manner along a direction perpendicular to the bases. The bottom cover is supported on the support strips, and a through space is formed between adjacent bases.

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