Powder bin cover turnover box

Abstract

The powder bin cover turnover box provided by the utility model includes a bottom wall, a peripheral wall and a barrier structure, the placement space includes at least two unit spaces which are sequentially arranged along a first horizontal direction, and the barrier structure is arranged between two adjacent unit spaces; in a second horizontal direction, the peripheral wall includes a first side wall part and a second side wall part which are located at opposite sides of the same unit space; the powder bin cover turnover box further includes a first material limiting convex body which is protruded from the inner side of the first side wall part, the first material limiting convex body is used for limiting the material placed in the unit space opposite to the first material limiting convex body from the second horizontal direction; and / or, the powder bin cover turnover box further includes a second material limiting convex body which is protruded from the inner side of the second side wall part, the second material limiting convex body is used for limiting the material placed in the unit space opposite to the second material limiting convex body from the second horizontal direction. The utility model provides the setting of the material limiting convex body on the inner side of the peripheral wall, which reduces the design difficulty and the cost.

Description

Technical Field

[0001] This utility model relates to the field of material transportation technology, specifically to a turnover box for a powder silo cover. Background Technology

[0002] Turnover boxes, also known as logistics boxes, are suitable for transportation, distribution, storage, and processing in factory logistics. A typical turnover box includes a bottom wall and surrounding walls, forming a placement space above the bottom wall and within the surrounding walls. To allow for the placement of multiple materials along a horizontal plane and to position them within the turnover box, some barrier structures are incorporated within the placement space. These barrier structures divide the placement space into multiple unit spaces along a first horizontal direction and also serve to position the materials.

[0003] The desired solution is a reusable container for holding the toner cartridge cover of a printing consumables handling box. The container must be able to be moved between the preceding toner cartridge cover dispensing device and the subsequent toner cartridge cover mounting device. However, there are numerous models of printing consumables handling boxes, and the outer contours and dimensions of the toner cartridge covers vary greatly. Based on the existing container structure, many dimensions of the container need to be recalculated and new molds created for different toner cartridge cover models, resulting in significant design challenges and high costs. Utility Model Content

[0004] The purpose of this utility model is to provide a turnover box for powder hopper covers that reduces design difficulty and cost.

[0005] The powder hopper cover turnover box provided by this utility model includes a bottom wall and a peripheral wall, with a placement space formed above the bottom wall and inside the peripheral wall; the powder hopper cover turnover box also includes a barrier structure disposed in the placement space, the placement space including at least two unit spaces arranged sequentially along a first horizontal direction, the barrier structure being disposed between two adjacent unit spaces; in the second horizontal direction, the peripheral wall includes a first side wall portion and a second side wall portion located on opposite sides of the same unit space; the powder hopper cover turnover box also includes a first material limiting protrusion protruding from the inner side of the first side wall portion, the first material limiting protrusion being used to restrict material placed in the unit space opposite to it from the second horizontal direction; and / or, the powder hopper cover turnover box also includes a second material limiting protrusion protruding from the inner side of the second side wall portion, the second material limiting protrusion being used to restrict material placed in the unit space opposite to it from the second horizontal direction.

[0006] As can be seen from the above scheme, by setting a first material limiting protrusion and / or a second material limiting protrusion on the inner side of the peripheral wall, the length side of the powder hopper cover placed in the turnover box is limited by the material limiting protrusion. In this way, when the turnover box needs to hold another powder hopper cover of a different size or model, the dimensions of the peripheral and bottom walls of the turnover box do not need to be adjusted. Only the position and length of the material limiting protrusion need to be adjusted to meet the positioning requirements of the other powder hopper cover. The design difficulty is reduced, and there is no need to redesign the mold. Only the corresponding forming part of the material limiting protrusion in the mold needs to be adjusted. Therefore, the production cost is reduced. In addition, when material limiting protrusions are set on both sides in the second horizontal direction, and the protrusion amount of the material limiting protrusions on both sides is designed according to the contours of the two ends of the powder hopper cover, it can be ensured that the powder hopper cover can only be placed in the unit position at a unique angle. This setting can ensure the uniformity of the powder hopper cover's packing angle, which is conducive to the subsequent automated installation of the powder hopper cover.

[0007] A further embodiment is that the first sidewall is provided with at least two first material limiting protrusions spaced apart along the first horizontal direction, and among the plurality of first material limiting protrusions provided on the first sidewall, at least two first material limiting protrusions have a height difference at their protruding ends along the second horizontal direction; and / or, the second sidewall is provided with at least two second material limiting protrusions spaced apart along the first horizontal direction, and among the plurality of second material limiting protrusions provided on the second sidewall, at least two second material limiting protrusions have a height difference at their protruding ends along the second horizontal direction.

[0008] As can be seen from the above, under this setting, multiple material limiting protrusions on the same side can limit multiple parts with different degrees of protrusion on the length end of the powder hopper cover, resulting in a better positioning effect for the powder hopper cover.

[0009] Another further embodiment is that a first protrusion structure is formed on the outer side of the first sidewall portion, and a first recess is formed on the inner side of the first sidewall portion relative to the protrusion of the first protrusion structure. In the second horizontal direction, the first recess is recessed away from the center of the unit space, and at least one first material limiting protrusion protrudes from the inner wall surface of the first recess; and / or, a second protrusion structure is formed on the outer side of the second sidewall portion, and a second recess is formed on the inner side of the second sidewall portion relative to the protrusion of the second protrusion structure. In the second horizontal direction, the second recess is recessed away from the center of the unit space, and at least one second material limiting protrusion protrudes from the inner wall surface of the second recess.

[0010] A further solution is that, in the case where the powder hopper cover turnover box has a first protruding structure, a first recess, a second protruding structure, and a second recess: between the first protruding structure, the first recess, the second protruding structure, and the second recess corresponding to the same unit space: in the first horizontal direction, the size of the first protruding structure is different from the size of the second protruding structure, and the size of the first recess is different from the size of the second recess.

[0011] As can be seen from the above, when stacking turnover boxes, the raised structures and recesses can work together to improve stacking stability and effectively prevent the boxes from loosening and separating during transportation. Of course, the setting of the material limiting protrusions will not be affected by the setting of the recesses; simply increasing the protrusion of the material limiting protrusions will ensure that the protruding ends of the material limiting protrusions reach the target position. A better solution is to have different dimensions between the raised structures on both sides of the first horizontal direction and different dimensions between the recesses, which can provide a certain degree of error prevention. If the turnover boxes are placed at an incorrect angle, they cannot be stacked, ensuring that the angles of multiple stacked turnover boxes are uniform, which is beneficial for the subsequent automated installation of powder hopper covers.

[0012] Another further embodiment is that the powder hopper cover turnover box also includes a height limiting protrusion; at least one height limiting protrusion is disposed on the outer side of the peripheral wall in a first horizontal direction; and / or, at least one height limiting protrusion is disposed on the outer side of the peripheral wall in a second horizontal direction; the height limiting protrusion is used to vertically limit the engagement with another powder hopper cover turnover box stacked below this powder hopper cover turnover box, so as to limit the depth of this powder hopper cover turnover box embedded in the other powder hopper cover turnover box below it.

[0013] As can be seen from the above, this setting enables the stacking of turnover boxes and ensures that the turnover box on top will not crush the powder hopper cover inside the turnover box below.

[0014] A further embodiment is that at least one height-limiting protrusion protrudes from the outer surface of a first protrusion structure, and / or at least one height-limiting protrusion protrudes from the outer surface of a second protrusion structure.

[0015] As can be seen from the above, even if the height-limiting protrusion protrudes from the outer surface of the protruding structure, the two will not affect each other's function. This allows the arrangement of multiple height-limiting protrusions to be unrestricted and to be more rationally distributed on the outer periphery of the peripheral wall to ensure uniform stress distribution.

[0016] Another further option is that the first material limiting protrusion and / or the second material limiting protrusion are protrusions, which have a protrusion in the second horizontal direction and an extension in the vertical direction.

[0017] As can be seen from the above, under this setting, the multiple powder hopper covers stacked vertically within the unit space can all be positioned by the convex strips.

[0018] Another further design is to have a vertically accessible anti-foolproof slot at the top of the perimeter wall and an anti-foolproof protrusion on the outer side of the perimeter wall; the anti-foolproof slot is used for inserting the anti-foolproof protrusion of another powder hopper cover turnover box stacked on top of this powder hopper cover turnover box.

[0019] As can be seen from the above, this setting further prevents mistakes. If the turnover boxes are placed at the wrong angle, they cannot be stacked, ensuring that the angles of multiple stacked turnover boxes are consistent, which is conducive to the subsequent automated installation of powder hopper covers.

[0020] Another further option is that the barrier structure includes a first barrier and a second barrier arranged opposite to each other along a second horizontal direction, with a connecting port between the first barrier and the second barrier, which connects two adjacent unit spaces.

[0021] As can be seen from the above, this design reduces the material usage of the turnover box, facilitates injection molding, and reduces the weight of the turnover box without affecting the barrier structure's ability to isolate materials in the two unit spaces. In addition, the connecting opening can also serve as a space to accommodate some protruding parts on the width side of the powder hopper cover, which further facilitates reducing the size of the turnover box.

[0022] A further embodiment is that at least one first material limiting protrusion protrudes from the first barrier, and / or at least one second material limiting protrusion protrudes from the second barrier.

[0023] As can be seen from the above, under this setting, the width-side protrusion of the powder hopper cover located in the connecting opening can also be restricted and positioned by the material limiting protrusion. Attached Figure Description

[0024] Figure 1 This is a structural diagram from a first perspective of the first embodiment of the turnover box for the powder hopper cover of this utility model.

[0025] Figure 2 This is a structural diagram from a second perspective of the first embodiment of the turnover box for the powder hopper cover of this utility model.

[0026] Figure 3 This is a top view of the structure of the first embodiment of the turnover box for the powder hopper cover of this utility model.

[0027] Figure 4 This is a third-view structural diagram of the first embodiment of the turnover box for powder hopper cover of this utility model in a stacked state.

[0028] Figure 5 This is a structural diagram from the fourth perspective of the stacked state of the first embodiment of the turnover box for the powder hopper cover of this utility model.

[0029] Figure 6 This is a structural diagram from the fifth perspective of the first embodiment of the turnover box for powder hopper cover of this utility model.

[0030] Figure 7 This is a top view of the structure of the second embodiment of the turnover box for the powder hopper cover of this utility model.

[0031] Figure 8This is a structural diagram from a first-view perspective of the second embodiment of the turnover box for powder hopper cover of this utility model in use.

[0032] Figure 9 This is a structural diagram from a second perspective showing the second embodiment of the turnover box for powder hopper covers of this utility model in use. Detailed Implementation

[0033] First embodiment of a turnover box for powder hopper cover See Figures 1 to 3 A unified spatial rectangular coordinate system is established in each of the attached figures. In the coordinate system, the y-axis direction represents the first horizontal direction of the present invention, the y-axis direction represents the second horizontal direction of the present invention, and the z-axis direction represents the vertical direction of the present invention. The turnover box 1 for the powder hopper cover in this embodiment includes a bottom wall 11 and a peripheral wall 12, and a placement space 100 is formed above the bottom wall 11 and inside the peripheral wall 12.

[0034] The powder hopper cover turnover box 1 also includes a barrier structure 13 disposed within the placement space 100. The placement space 100 includes at least two unit spaces 10 arranged sequentially along a first horizontal direction, and the barrier structure 13 is disposed between two adjacent unit spaces 101. In this embodiment, three sets of barrier structures 13 are provided, and the placement space 100 is configured as four unit spaces 101 arranged sequentially along the first horizontal direction.

[0035] In the second horizontal direction, the peripheral wall 12 includes a first sidewall portion 121 and a second sidewall portion 122 located on opposite sides of the same unit space 101. For example... Figure 3 As shown, in this embodiment, the barrier structure 13 includes a first barrier 131 and a second barrier 132 disposed opposite to each other along a second horizontal direction. The first barrier 131 and the second barrier 132 protrude from the inner wall surfaces of the first sidewall portion 121 and the second sidewall portion 122, respectively. In the second horizontal direction, a connecting opening 130 is formed between the first barrier 131 and the second barrier 132, and the connecting opening 130 connects two adjacent unit spaces 101. This arrangement reduces the material used in the turnover box 1, facilitates injection molding, and reduces the weight of the turnover box 1 without affecting the barrier structure 13's barrier effect on the materials in the two unit spaces 101. In addition, the connecting opening 130 can also serve as a receiving space for some protruding parts on the width side of the powder hopper cover, which further facilitates reducing the size of the turnover box 1.

[0036] See also Figures 1 to 3The outer side of the first sidewall portion 121 forms a first protrusion structure 151 corresponding to each unit space 101. The inner side of the first sidewall portion 121 is provided with a first recess 153 formed relative to the protrusion of the first protrusion structure 151. In the second horizontal direction, the first recess 153 is recessed into the inner wall surface of the first sidewall portion 121 away from the center of the unit space 101. That is, in this embodiment, the number of the first protrusion structure 151 and the first recess 153 are both four.

[0037] Similarly, the outer side of the second sidewall portion 122 forms a second protrusion structure 152 corresponding to each unit space 101, and the inner side of the second sidewall portion 122 is provided with a second recess 154 formed relative to the protrusion of the second protrusion structure 152. In the second horizontal direction, the second recess 154 is recessed into the inner wall surface of the second sidewall portion 122 away from the center of the unit space 101. That is, in this embodiment, the number of the second protrusion structure 152 and the number of the second recess 154 are both four.

[0038] like Figure 3 As shown, between the first protrusion structure 151, the first recess 153, the second protrusion structure 152, and the second recess 154 corresponding to the same unit space 101: in the first horizontal direction, the first dimension w1 of the first recess 153 is different from the second dimension w2 of the second recess 154, specifically, the second dimension w2 is greater than the first dimension w1; similarly, the dimensions of the first protrusion structure 151 are different from the dimensions of the second protrusion structure 152, and the dimensions of the first protrusion structure 151 are greater than the dimensions of the second protrusion structure 152.

[0039] Combination Figure 4 and Figure 5 When two turnover boxes 1 are stacked, the first protrusion 151 of the upper turnover box 1 inserts downward into the first recess 153 of the lower turnover box 1, and the second protrusion 152 of the upper turnover box 1 inserts downward into the second recess 154 of the lower turnover box 1. This fit can improve stacking stability and effectively prevent the boxes from loosening and separating during transportation. Furthermore, the different sizes of the protrusions on both sides of the first horizontal direction and the different sizes of the recesses can play a certain role in preventing mistakes. If the turnover boxes 1 are placed at the wrong angle, they cannot be stacked, ensuring that the angles of the stacked turnover boxes 1 are uniform, which is conducive to the subsequent automated installation of the powder hopper cover.

[0040] See also Figures 1 to 3The powder hopper cover turnover box 1 also includes a first material limiting protrusion 141 protruding from the inner side of the first side wall portion 121, and a second material limiting protrusion 142 protruding from the inner side of the second side wall portion 122. The first material limiting protrusion 141 and the second material limiting protrusion 142 are used to restrict the material (powder hopper cover) placed in the unit space 101 opposite to it from opposite sides in the second horizontal direction. See also Figure 3 In this embodiment, corresponding to each unit space 101, the first sidewall portion 121 is provided with two first material limiting protrusions 141 arranged at intervals along a first horizontal direction, and the protruding ends of the two first material limiting protrusions 141 along a second horizontal direction have a first height difference d1; the second sidewall portion 122 is provided with two second material limiting protrusions 142 arranged at intervals along a first horizontal direction, and the protruding ends of the two second material limiting protrusions 142 along a second horizontal direction have a second height difference d2. With this arrangement, multiple material limiting protrusions on the same side can respectively limit multiple parts with different degrees of protrusion on the length end of the powder hopper cover, resulting in a better positioning effect for the powder hopper cover.

[0041] See Figure 1 and Figure 3 On the inner side of the first sidewall portion 121, one of the first material limiting protrusions 141 corresponding to each unit space 101 protrudes from the inner wall surface 1531 of the first recess 153, while the other first material limiting protrusion 141 protrudes from the first barrier 131. On the inner side of the second sidewall portion 122, two second material limiting protrusions 142 corresponding to each unit space 101 protrude from the inner wall surface of the second sidewall portion 122 and are located outside the second recess 154. The material limiting protrusions can be set on the inner wall surface of the sidewall portion or on the inner wall surface of the recess, depending on the location of the powder hopper cover that needs to be limited. Mainly, since the setting of the recess does not affect the setting of the material limiting protrusions, the protrusion height and position of the material limiting protrusions in the first horizontal direction are both selectable with freedom.

[0042] Furthermore, the first material limiting protrusion 141 and the second material limiting protrusion 142 are protrusions, each having a protrusion in the second horizontal direction and an extension in the vertical direction. In this embodiment, the protrusions protrude from the inner wall of the first recess along the second horizontal direction and extend vertically. With this configuration, multiple powder hopper covers stacked vertically within the unit space 101 can be positioned and restricted by the protrusions.

[0043] See Figure 1 and Figure 2 as well as Figure 4 and Figure 5The powder hopper cover turnover box 1 also includes height-limiting protrusions 161. In this embodiment, several height-limiting protrusions 161 are provided on the outer side of the peripheral wall 12 in both the first horizontal direction and the second horizontal direction. The height-limiting protrusions 161 are vertically extending convex strips. The height-limiting protrusions 161 are used to vertically limit the engagement with another powder hopper cover turnover box 1 stacked below this powder hopper cover turnover box 1. Specifically, the height-limiting protrusions 161 abut against the top of the peripheral wall 12 of the other powder hopper cover turnover box 1 below, thereby limiting the depth to which the bottom of this powder hopper cover turnover box 1 is embedded in the other powder hopper cover turnover box 1 below it. This arrangement ensures that the upper turnover box 1 will not crush the powder hopper cover inside the lower turnover box 1 while achieving stacking between turnover boxes 1.

[0044] Furthermore, in this embodiment, the limiting protrusions 161 on the outer side in the second horizontal direction are all provided on the first protruding structure 151 or the second protruding structure 152. Even further, in this embodiment, on the outer side of the first sidewall portion 121, a height-limiting protrusion 161 protrudes from the outer surface of each first protruding structure 151, while on the outer side of the second sidewall portion 122, a height-limiting protrusion 161 is provided at an adjacent location of two second protruding structures 152 in the first horizontal direction. Of course, in other embodiments, the height-limiting protrusion 161 protrudes from the outer surface of the second protruding structure 152. Mainly, since the height-limiting protrusions 161 protrude from the outer surface of the protruding structures, they do not affect each other's function, thus allowing the arrangement of multiple height-limiting protrusions 161 to be unrestricted and more rationally distributed on the outer periphery of the peripheral wall 12 to ensure uniform force distribution.

[0045] See Figure 2 and combined Figure 4 The top of the second sidewall portion 122 is provided with a vertically accessible anti-misplacement slot 163. On the outer side of the second sidewall portion 122, two second protruding structures 152 are adjacent in the first horizontal direction, each with an anti-misplacement protrusion 162, which is a vertically extending ridge. The bottom of the anti-misplacement protrusion 162 is lower than the bottom of the limiting protrusion 161. The anti-misplacement slot 163 is used for inserting the anti-misplacement protrusion 162 of another powder hopper cover turnover box 1 stacked on top of this powder hopper cover turnover box 1. This design further enhances the anti-misplacement effect; if the turnover box 1 is placed at an incorrect angle, it cannot be stacked, ensuring that the angles of multiple stacked turnover boxes 1 are uniform, which facilitates the subsequent automated installation of the powder hopper cover.

[0046] See Figure 2 The upper surface of the bottom wall 11 is provided with a first reinforcing rib 171 extending in the second horizontal direction, and each unit space 101 has a first reinforcing rib 171 at its bottom; see also Figure 6The bottom wall 11 has a second reinforcing rib 172 on its lower surface, which forms a reinforcing rib network; the top of the peripheral wall 12 has a protruding edge 129, and the lower surface of the protruding edge 129 has a third reinforcing rib 173, which also forms a reinforcing rib network. This design ensures the strength of the turnover box 1.

[0047] Second embodiment of a turnover box for powder hopper covers See Figure 7 This embodiment demonstrates a first material limiting protrusion and a different arrangement of the first material limiting protrusion from the first embodiment. This is to show that the first material limiting protrusion and the second material limiting protrusion in this utility model have sufficient freedom in setting the position in the first horizontal direction and the protrusion height in the second horizontal direction, so as to meet the actual needs of cooperating with different models of powder hopper covers without changing the design of the peripheral wall and the bottom wall.

[0048] In this embodiment, relative to a unit space, one of the first material limiting protrusions 241 on the first side wall is disposed on the inner wall surface of the first side wall, while the other two first material limiting protrusions 241 are disposed on the inner wall surface of the first recess 251, and the two second material limiting protrusions 242 on the second side wall are both disposed on the inner wall surface of the second side wall.

[0049] See Figure 8 and Figure 9 When the powder hopper cover 9 is stacked in the unit space 201, the barrier structure 23 restricts the powder hopper cover 9 from the first horizontal direction, and the multiple first material limiting protrusions 241 and the multiple second material limiting protrusions 242 restrict different parts of the powder hopper cover 9 from the opposite sides of the second horizontal direction respectively.

[0050] Comparing the first and second embodiments above, it can be seen that this utility model, by providing a first material limiting protrusion and / or a second material limiting protrusion on the inner side of the peripheral wall, limits the length of the powder hopper cover placed in the turnover box. Thus, when the turnover box needs to hold another powder hopper cover of a different size or model, the dimensions of the peripheral and bottom walls of the turnover box do not need to be adjusted; only the position and length of the material limiting protrusion need to be adjusted to meet the positioning requirements of the other powder hopper cover. This reduces design complexity and eliminates the need to redesign the mold; only the corresponding forming part of the material limiting protrusion in the mold needs to be adjusted, thereby reducing production costs. Furthermore, with material limiting protrusions provided on both sides in the second horizontal direction, and the protrusion amount of the material limiting protrusions on both sides designed according to the contours of the two ends of the powder hopper cover, it can be ensured that the powder hopper cover can only be placed in the unit position at a unique angle. This setting ensures the uniformity of the powder hopper cover's packing angle, facilitating subsequent automated installation of the powder hopper cover.

[0051] Finally, it should be emphasized that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. For those skilled in the art, the present utility model can have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A turnover box for powder hopper covers, comprising a bottom wall and a peripheral wall, wherein a placement space is formed above the bottom wall and within the peripheral wall; the turnover box for powder hopper covers further comprises a barrier structure disposed within the placement space, wherein the placement space comprises at least two unit spaces arranged sequentially along a first horizontal direction, and the barrier structure is disposed between two adjacent unit spaces; Its features are: In the second horizontal direction, the peripheral wall includes a first sidewall portion and a second sidewall portion located on opposite sides of the same unit space; The powder hopper cover turnover box further includes a first material limiting protrusion protruding from the inner side of the first side wall portion, the first material limiting protrusion being used to restrict material placed in the unit space opposite to it from the second horizontal direction; and / or, the powder hopper cover turnover box further includes a second material limiting protrusion protruding from the inner side of the second side wall portion, the second material limiting protrusion being used to restrict material placed in the unit space opposite to it from the second horizontal direction.

2. The turnover box for the powder hopper cover according to claim 1, characterized in that: The first sidewall portion is provided with at least two first material limiting protrusions arranged at intervals along the first horizontal direction, and among the plurality of first material limiting protrusions provided on the first sidewall portion, at least two first material limiting protrusions have a height difference at their protruding ends along the second horizontal direction. And / or, The second sidewall portion is provided with at least two second material limiting protrusions arranged at intervals along the first horizontal direction. Among the plurality of second material limiting protrusions provided on the second sidewall portion, at least two second material limiting protrusions have a height difference at their protruding ends along the second horizontal direction.

3. The turnover box for the powder hopper cover according to claim 1, characterized in that: A first protrusion structure is formed on the outer side of the first sidewall portion, and a first recess is formed on the inner side of the first sidewall portion relative to the protrusion of the first protrusion structure. In the second horizontal direction, the first recess is recessed away from the center of the unit space, and at least one first material limiting protrusion protrudes from the inner wall surface of the first recess. And / or, A second protrusion structure is formed on the outer side of the second sidewall portion, and a second recess is provided on the inner side of the second sidewall portion relative to the protrusion of the second protrusion structure. In the second horizontal direction, the second recess is recessed away from the center of the unit space, and at least one second material limiting protrusion protrudes from the inner wall surface of the second recess.

4. The turnover box for the powder hopper cover according to claim 3, characterized in that: When the powder hopper cover turnover box has the first protruding structure, the first recess, the second protruding structure, and the second recess: Between the first protruding structure, the first recess, the second protruding structure, and the second recess corresponding to the same unit space: In the first horizontal direction, the size of the first protrusion is different from the size of the second protrusion, and the size of the first recess is different from the size of the second recess.

5. The turnover box for the powder hopper cover according to claim 3, characterized in that: The turnover box for the powder hopper cover also includes a height-limiting protrusion; At least one of the height-limiting protrusions is disposed on the outer side of the peripheral wall in the first horizontal direction; and / or, at least one of the height-limiting protrusions is disposed on the outer side of the peripheral wall in the second horizontal direction. The height-limiting protrusion is used to vertically limit the depth at which the powder hopper cover turnover box is embedded in the other powder hopper cover turnover box below it.

6. The turnover box for the powder hopper cover according to claim 5, characterized in that: At least one of the height-limiting protrusions protrudes from the outer surface of one of the first protrusion structures, and / or at least one of the height-limiting protrusions protrudes from the outer surface of one of the second protrusion structures.

7. The turnover box for the powder hopper cover according to any one of claims 1 to 6, characterized in that: The first material limiting protrusion and / or the second material limiting protrusion are protrusions, the protrusions having a protrusion amount in the second horizontal direction and an extension amount in the vertical direction.

8. The turnover box for the powder hopper cover according to any one of claims 1 to 6, characterized in that: The top of the peripheral wall is provided with a vertically accessible anti-foolproof slot, and the outer side of the peripheral wall is provided with an anti-foolproof protrusion. The foolproof slot is for inserting the foolproof protrusion of another powder hopper cover turnover box stacked on top of this powder hopper cover turnover box.

9. The turnover box for the powder hopper cover according to any one of claims 1 to 6, characterized in that: The barrier structure includes a first barrier and a second barrier disposed opposite to each other along the second horizontal direction, and a communication port is formed between the first barrier and the second barrier, the communication port connecting two adjacent unit spaces.

10. The turnover box for the powder hopper cover according to claim 9, characterized in that: At least one of the first material limiting protrusions protrudes from the first barrier, and / or at least one of the second material limiting protrusions protrudes from the second barrier.

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