Waterproof box

Abstract

The utility model provides a waterproof box, which comprises a first box body and a second box body which can form a closed environment when the first box body and the second box body are oppositely combined, and installation parts, a first threading hole for two end parts of a cable to penetrate out is formed when the installation parts are oppositely combined, a first sealing piece is provided with a second threading hole communicated with the first threading hole, and a second sealing piece is arranged on the second threading hole. Each mounting part extends along the axis direction of the cable to form an action unit protruding out of the end part of each box body, the cable connector further comprises a limiting unit detachably constructed on the action unit, and the limiting unit can force at least local part of the action unit to deform so as to extrude the first sealing element; therefore, the cable is tightly sealed by the second threading hole of the first sealing element, namely, the leakage problem caused by the limitation of the elastic restoring force of the sealing element for a long time is compensated in a mechanical mode, the sealing performance of the waterproof box is improved, and water and dust are prevented from flowing into electrical products such as a connector arranged in the waterproof box.

Description

TECHNICAL FIELD

[0001] The utility model relates to the electrical field especially relates to a waterproof box for protecting electrical products such as electric wire connector. BACKGROUND

[0002] Indoor and outdoor construction site power supply and outdoor appliance charging are more and more common, and mobile power supply scene is also more and more common. Because dust and sand often occur in construction site, and rain often occurs when outdoor appliance is charging, the protection performance of the appliance connector is not high, which leads to power supply obstruction or unsafe power supply.

[0003] Therefore, the Chinese utility model patent with the patent number ZL201920675329.6 (the authorized announcement number is CN209571629U) discloses a mobile dustproof and waterproof box. The waterproof box comprises a cover body, a box body and a sealing member. The sealing member is arranged in the interior of the cover body to achieve the effects of dustproof and waterproof. However, the following defects still exist in the use process: 1. The sealing member seals the gap between the cable and the waterproof box due to the elastic recovery force of the sealing member. When the waterproof box is used in a sunny, humid or low-temperature working environment, or when the frequency of use is too high, the elastic recovery force of the sealing ring is limited, which causes a gap between the cable and the sealing member for water and dust to pass through, thereby causing the electric wire connector inside the waterproof box to be short-circuited or have increased resistance, and there is a risk of fire; 2. The cover body and the box body of the waterproof box are respectively formed with a closed-loop-shaped groove in the use process. In the closed state, two end portions of the cable are formed with a threading hole. The end portion in the groove shape is difficult to apply additional force to the sealing member, so that the gap problem caused by the limited elastic recovery force of the sealing member cannot be compensated. UTILITY MODEL CONTENTS

[0004] The first technical problem to be solved by the utility model is to provide a waterproof box with better sealing performance in view of the above-mentioned prior art.

[0005] The second technical problem to be solved by the utility model is to provide a waterproof box that can adjust the sealing performance even when the waterproof box is in use in view of the above-mentioned prior art.

[0006] The utility model discloses a waterproof box that solves the first technical problem, and the technical scheme is as follows: the waterproof box comprises a first box body and a second box body that can form a closed environment, the end of the first box body and the second box body is formed with an installation part for installing a first sealing element, and a first threading hole for the two ends of a cable to pass through is formed in the closed state of each installation part, and the first sealing element has a second threading hole that is in communication with the first threading hole, characterized in that each installation part extends along the axial direction of the cable and has an action unit that protrudes from the end of each box body, and a limiting unit is detachably arranged on the action unit, the limiting unit can force at least a part of the action unit to deform so that the first sealing element is extruded, thereby tightly sealing the second threading hole of the first sealing element and the cable.

[0007] In order to make the action unit at least partially deform to extrude the first sealing element, preferably, the action unit comprises a limiting groove on the inner side and an elastic clamping leg on the outer side that can be bent and deformed, and correspondingly, the limiting unit comprises a limiting cap that has a threading channel for the cable to pass through, the threading end of the limiting cap is detachably connected to the limiting groove, and the cross section of the outgoing end of the limiting cap gradually decreases along the outgoing direction, so that in the state that the threading end of the limiting cap is connected to the limiting groove, the outgoing end of the limiting cap can force the elastic clamping leg to fold towards the center. The limiting cap is ingeniously designed to have a structure in which the outgoing end gradually decreases along the outgoing direction, so that when the threading end of the limiting cap is connected to the limiting groove, the outgoing end can extrude the elastic clamping leg to fold towards the center, thereby extruding the first sealing element to tightly seal the second threading hole and the cable.

[0008] Further, the elastic clamping leg comprises at least two sub-clamping legs that are spaced apart along the limiting groove, the end of each sub-clamping leg has a clamping leg that extends towards the center, and each clamping leg can constrain the first sealing element in the action unit. In this way, the movement of the first sealing element is limited and can only elastically deform to seal the cable under the extrusion of each sub-clamping leg, and in addition, even if the first sealing element ages after long-term use, the sealing performance of the inner side of the first sealing element decreases, but the outer side can still extrude each sub-clamping leg to fold inward by means of the limiting cap to ensure good waterproof performance of the outer side.

[0009] To solve the second technical problem, preferably, the limiting cap comprises a first limiting part and a second limiting part, the wire inlet end of the first limiting part is provided with a sliding groove, the wire inlet end of the second limiting part is provided with a sliding rail which is in sliding cooperation with the sliding groove, the wire outlet end of the first limiting part is provided with a buckle, and the wire outlet end of the second limiting part is correspondingly provided with a clamping groove, and the first limiting part and the second limiting part are detachably connected and form the threading channel through the cooperation of the sliding rail and the sliding groove and the cooperation of the buckle and the clamping groove. The limiting cap is divided into the first limiting part and the second limiting part which are connected together, and when it acts on the action unit, the first limiting part and the second limiting part can be respectively arranged on both sides of the cable and connected together, so that the cable is located in the threading channel formed by the two parts, and the complicated step of threading the cable through the threading channel from the end is avoided. At the same time, the split structure can adaptively adjust the sealing performance of the waterproof box according to the actual use state. For example, if the sealing performance is found to be poor during use, a limiting cap with a smaller cross section at the wire outlet end can be replaced to further press the first sealing element. When replacing, the limiting cap can be removed by detaching the wire inlet end of the limiting cap from the limiting groove, and then relatively sliding the first limiting part and the second limiting part to separate the buckle and the clamping groove and the sliding groove and the sliding rail. In addition to the above scheme, for those skilled in the art, the sliding groove can be arranged at the wire inlet end of the second limiting part, and the sliding rail can be arranged at the wire inlet end of the first limiting part, which can also be used as a scheme to achieve the above effect. Similarly, the buckle can be arranged at the wire outlet end of the second limiting part, and the clamping groove can be arranged at the wire outlet end of the first limiting part.

[0010] To tightly seal the cable in the second threading hole, preferably, the first sealing element comprises a first sealing section on the inner side and a second sealing section on the outer side, the first sealing section is arranged in the limiting groove, the diameter of the second sealing section is larger than that of the first sealing section, and the second sealing section is limited in the elastic clamping leg and can be elastically deformed under the action of the elastic clamping leg to the center to tightly seal the cable in the second threading hole. The larger diameter of the second sealing section can improve the elastic deformation ability of the second sealing section, and the greater elastic deformation of the second sealing section can make the second threading hole in it more tightly to the center, thereby tightly sealing the cable.

[0011] Further, the first sealing element is provided with a wire passing groove for placing the cable into the second threading hole, and the wire passing groove is in communication with the second threading hole and penetrates the first sealing section and the second sealing section. When in use, the cable can be directly placed into the second threading hole from the wire passing groove, without the need to thread the cable through the second threading hole from the end.

[0012] In order to further improve the sealing performance of the waterproof box, preferably, the end of the first box body and the second box body is further formed with a mounting groove on the inner side of the mounting portion, and a second sealing element is arranged in each mounting groove. Each second sealing element comprises at least two sealing pieces and a connecting portion connecting the sealing pieces. Each sealing piece is arranged in the axial direction of the first threading hole. The connecting portion connects the inner circumferential walls of the sealing pieces and forms a third threading hole communicating with the first threading hole in the closed state. The arrangement of the second sealing element provides a second layer of protection for the sealing performance of the waterproof box. Even if the first sealing element ages, the second sealing element can still seal the cable. The second sealing element adopts a plurality of sealing pieces. The corresponding sealing pieces can be enclosed and sleeved on the outer circumferential side of the cable to achieve individual sealing. At the same time, the structure of the plurality of sealing pieces has good elasticity and can prevent the sealing element from aging or deforming.

[0013] In order to more conveniently install the sealing element in the mounting groove, preferably, a positioning portion is arranged in the mounting groove, and a positioning groove is formed between the adjacent sealing pieces of the second sealing element. The positioning portion can be inserted into the positioning groove. In this way, the positioning portion and the positioning groove cooperate to facilitate the positioning and installation of the second sealing element, and can limit the movement of the second sealing element relative to the box body.

[0014] In order to avoid water leakage through the gap between the first box body and the second box body when they are closed, preferably, a sealing ring is arranged at the closed portion of the first box body and the second box body. The sealing ring is integrally formed with the second sealing element arranged on the first box body and / or the second sealing element arranged on the second box body. The arrangement of the sealing ring can ensure the sealing of the closed portion of the first box body and the second box body. Integrally forming the sealing ring with the second sealing element can cover the closed portion between the box bodies as a whole, avoiding the existence of a gap between them and preventing water leakage.

[0015] In order to enable the first box body and the second box body to be in a closed state, preferably, the first box body is provided with a buckle portion, and the second box body is provided with a buckling portion. Alternatively, the second box body is provided with a buckle portion, and the first box body is provided with a buckling portion. When the buckle portion is buckled on the buckling portion, the first box body and the second box body are kept in a closed state, and can be separated by applying force to the buckle portion to make it elastically deform and separate from the buckling portion. When using, applying force to the buckle portion to separate it from the buckling portion can separate the first box body and the second box body. At this time, the cable can be placed in the box body. Buckling the buckle portion on the buckling portion can keep the first box body and the second box body in a closed state to form a sealed environment that can seal the cable.

[0016] Compared with the prior art, the advantages of this utility model are as follows: the waterproof box forces the action unit to deform by setting a limiting unit to squeeze the first sealing element, so as to tightly seal the cable through the second wire hole of the first sealing element. That is, it uses a mechanical method to compensate for the leakage problem caused by the limitation of the elastic recovery force of the sealing element over a long period of time, improves the sealing performance of the waterproof box, and prevents moisture and dust from flowing into electrical products such as connectors arranged inside the waterproof box. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0018] Figure 2 for Figure 1 Sectional view at point AA;

[0019] Figure 3 for Figure 2 Enlarged view of point B in the middle;

[0020] Figure 4 This is a structural schematic diagram of the waterproof box in the disengaged state of the buckle and fastening parts in an embodiment of the present utility model;

[0021] Figure 5 This is a structural diagram of the first box body in the open state relative to the second box body in an embodiment of the present utility model;

[0022] Figure 6 This is an exploded view of an embodiment of the present utility model;

[0023] Figure 7 for Figure 6 Enlarged view of point C in the middle;

[0024] Figure 8 This is an exploded view of the limiting cap in an embodiment of this utility model;

[0025] Figure 9 This is a schematic diagram of the structure of the first sealing element in an embodiment of this utility model;

[0026] Figure 10 This is a schematic diagram of the structure of the second sealing element in an embodiment of this utility model. Detailed Implementation

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0028] like Figures 1-9 The diagram shows a preferred embodiment of the present invention. The waterproof box of the present invention includes a first box body 1 and a second box body 2 that are relatively compatible in forming a sealed environment. See below... Figure 4The first box body 1 is provided with a buckle portion 14, and the second box body 2 is correspondingly provided with a buckling portion 21. When the buckle portion 14 is buckled on the buckling portion 21, the first box body 1 and the second box body 2 are kept in the closed state. When the buckle portion 14 is elastically deformed to be separated from the buckling portion 21, the first box body 1 can be opened relative to the second box body 2 and separated.

[0029] To ensure the sealing performance of the waterproof box, refer to Figures 3-6 The waterproof box is provided with a first sealing member 3. Correspondingly, the end portions of the first box body 1 and the second box body 2 are respectively formed with mounting portions for mounting the first sealing member 3. In the closed state of the mounting portions, a first threading hole 11 for threading the two end portions of the cable is formed, and the first sealing member 3 has a second threading hole 31 which is communicated with the first threading hole 11. In order to avoid the limitation of the elastic recovery force of the first sealing member 3 in the prior art and cause the gap between the second threading hole 31 and the cable, the mounting portions of the embodiment extend along the axis direction of the cable and protrude from the end portions of the box bodies. An acting unit 4 is formed on the mounting portions, and a limiting unit is detachably arranged on the acting unit 4. The limiting unit can force at least a part of the acting unit 4 to be deformed to extrude the first sealing member 3, so as to tightly seal the second threading hole 31 and the cable. The acting unit 4 can generate additional force to act on the first sealing member 3 under the force of the limiting unit, that is, the mechanical method is used to compensate the leakage problem caused by the limitation of the elastic recovery force of the first sealing member 3 for a long time, and prevent the moisture and dust from flowing into the electrical products such as the connector arranged in the waterproof box.

[0030] As shown in Figure 7 The acting unit 4 of the embodiment includes a limiting groove 41 on the inner side and an elastic clamping leg 42 on the outer side which can be bent and deformed. Correspondingly, refer to Figure 3The limiting unit comprises a limiting cap 5 having a threading channel 51 for the cable to pass through. The threading end 5a of the limiting cap 5 is detachably connected to the limiting groove 41 by screwing. The cross section of the outgoing end 5b of the limiting cap 5 gradually decreases along the outgoing direction. Thus, when the threading end 5a of the limiting cap 5 is connected to the limiting groove 41, the outgoing end 5b of the limiting cap 5 can force the elastic clamping leg 42 to contract towards the center. The elastic clamping leg 42 comprises at least two sub-clamping legs 421 which are spaced along the limiting groove 41. The end of each sub-clamping leg 421 has a clamping leg 422 extending towards the center. Each clamping leg 422 can constrain the first sealing member 3 in the acting unit. In this scheme, the limiting cap 5 is ingeniously designed to have the outgoing end 5b gradually decreasing along the outgoing direction. Thus, when the threading end 5a of the limiting cap 5 is connected to the limiting groove 41, the outgoing end 5b can squeeze the elastic clamping leg 42 to contract towards the center, i.e. the elastic deformation of the elastic clamping leg 42 is used as a mechanical way to compensate the elastic restoring force of the first sealing member 3. The first sealing member 3 can be squeezed to be elastically deformed and the second threading hole 31 can be sealed to the cable. The clamping leg 422 is arranged to limit the movement of the first sealing member 3 so that it can only be elastically deformed under the squeezing of each sub-clamping leg 421 to seal the cable. In addition, even if the first sealing member 3 is aged after long time use, the sealing performance of the inner side of the first sealing member 3 will decrease, but the outer side can still contract inwards when the limiting cap 5 squeezes each sub-clamping leg 421 to ensure good waterproof performance of the outer side.

[0031] In order to adjust the sealing performance of the waterproof box in use, the limiting cap 5 of the present embodiment has a split structure, as shown in Figure 8As shown, the limiting cap 5 includes a first limiting part 52 and a second limiting part 53 detachably connected with the first limiting part 52. In this embodiment, the first limiting part 52 is provided with a sliding groove 521 and the second limiting part 53 is provided with a sliding rail 531 at the wire inlet end 5a of the limiting cap 5, and the first limiting part 52 is provided with a buckle 522 and the second limiting part 53 is provided with a clamping groove 332 at the wire outlet end 5b of the limiting cap 5. When the sliding rail 531 slides into the sliding groove 521 and the buckle 522 is buckled with the clamping groove 332, the first limiting part 52 and the second limiting part 53 are connected and form a threading channel 51. When the buckle 522 is separated from the clamping groove 332 and the sliding rail 531 is separated from the sliding groove 521, the first limiting part 52 and the second limiting part 53 are separated. In this way, the first limiting part 52 and the second limiting part 53 are respectively placed on both sides of the cable and connected in a clamped manner, so that the cable can be directly located in the threading channel 51 formed by the clamped connection of the first limiting part 52 and the second limiting part 53, avoiding the complicated steps of threading the cable through the threading channel 51 from the end. At the same time, the split structure can adaptively adjust the sealing performance of the waterproof box according to the actual use state. For example, if the sealing performance is found to be poor during use, a limiting cap 5 with a smaller cross-section at the wire outlet end 5b can be replaced to further press the first sealing element 3. When replacing, the limiting cap 5 is only needed to be detached from the limiting groove 41, and the first limiting part 52 and the second limiting part 53 are separated to remove the limiting cap 5. In addition, in order to adapt to special specifications of the cable, the first sealing element 3 with a second threading hole 31 of different diameter needs to be replaced to enable the second threading hole 31 to seal the cable. The split limiting cap 5 can facilitate the replacement of the first sealing element 3. When replacing the first sealing element 3, the limiting cap 5 is only needed to be rotated out of the limiting groove 41 and the first limiting part 52 and the second limiting part 53 are separated to release the limiting of the first sealing element 3 and replace it.

[0032] As Figure 9 shown, the first sealing element 3 of the present embodiment includes a first sealing section 3a located on the inner side and a second sealing section 3b located on the outer side. The first sealing section 3a is arranged in the limiting groove 41, and the second sealing section 3b has a larger diameter than the first sealing section 3a. The second sealing section 3b is limited in the elastic clamping leg 42 and can be elastically deformed under the action of the elastic clamping leg 42 to the center to tightly seal the cable. In this way, the second sealing section 3b with a larger diameter has a stronger elastic deformation ability, so that the second sealing section 3b can be elastically deformed to a greater extent, and the second threading hole 31 in it can be gathered to the center to a greater extent, thereby tightly sealing the cable. In addition, the first sealing element 3 is also provided with a threading groove 32 for placing the cable into the second threading hole 31. The threading groove 32 communicates with the second threading hole 31 and penetrates the first sealing section 3a and the second sealing section 3b. During use, the cable can be directly placed into the second threading hole 31 from the threading groove 32, without the need to thread the cable through the second threading hole 31 from the end.

[0033] As Figure 10 shown, the waterproof box of the present embodiment is further provided with a second sealing member 6, and the end of the first box body 1 and the second box body 2 is further formed with a mounting groove 12 for mounting the second sealing member 6 on the inner side of the mounting portion, and the second sealing member 6 is arranged in each mounting groove 12, each second sealing member 6 comprises three sealing pieces 61 and a connecting portion 62 connecting the sealing pieces 61, each sealing piece 61 is arranged along the axis direction of the first threading hole 11, and the connecting portion 62 connects the inner circumferential wall of each sealing piece 61 and forms a third threading hole 63 communicating with the first threading hole 11 in the closed state. The arrangement of the second sealing member 6 provides a second layer of protection for the sealing performance of the waterproof box, even if the first sealing member 3 ages, the second sealing member 6 can seal the cable, and the second sealing member 6 adopts the form of multiple sealing pieces 61, each corresponding sealing piece 61 can be mutually enclosed and sleeved on the outer circumferential side of the cable to realize individual sealing, at the same time, the structure of multiple sealing pieces 61 has good elasticity, and can also prevent the sealing member from aging or deforming. In order to more conveniently mount the sealing member in the mounting groove 12, the mounting groove 12 is provided with a positioning portion 13, and the adjacent sealing pieces 61 of the second sealing member 6 form a positioning groove 64, and the positioning portion 13 can be inserted into the positioning groove 64. In this way, through the cooperation of the positioning portion 13 and the positioning groove 64, the second sealing member 6 can be conveniently positioned and installed, and the movement of the second sealing member 6 relative to each box body can be limited.

[0034] In addition, as Figure 6 shown, the present embodiment is further provided with a sealing ring 7 at the joint of the first box body 1 and the second box body 2, and the sealing ring 7 is integrally formed with the second sealing member 6 arranged on the second box body 2. The arrangement of the sealing ring 7 can ensure the sealing of the joint of the first box body 1 and the second box body 2, and the integral molding of the sealing ring 7 and the second sealing member 6 can cover the joint between the box bodies as a whole, avoiding the existence of gaps between them and water leakage.

Claims

1. A waterproof box, comprising a first box body (1) and a second box body (2) that are able to form a sealed environment, wherein the ends of the first box body (1) and the second box body (2) are respectively formed with mounting portions for mounting a first sealing member (3), and a first through hole (11) for two ends of a cable to pass through is formed when the mounting portions are engaged, and the first sealing member (3) has a second through hole (31) communicating with the first through hole (11), characterized in that: The installation part extends along the axis direction of the cable and has an action unit (4) protruding from the end of the box body, and further comprises a limiting unit detachably arranged on the action unit (4), which can force at least partial deformation of the action unit (4) to extrude the first sealing member (3), so that the second threading hole (31) of the first sealing member (3) tightly seals the cable.

2. The waterproof box according to claim 1, characterized in that: The action unit (4) comprises an inner limiting groove (41) and an outer elastic clamping leg (42) capable of being bent and deformed, and the limiting unit comprises a limiting cap (5) having a threading channel (51) for the cable to pass through, and the inlet end (5a) of the limiting cap (5) is detachably connected to the limiting groove (41), and the cross section of the outlet end (5b) of the limiting cap (5) gradually decreases along the outlet direction, so that the outlet end (5b) of the limiting cap (5) can force the elastic clamping leg (42) to be gathered to the center when the inlet end (5a) of the limiting cap (5) is connected to the limiting groove (41).

3. The waterproof box according to claim 2, characterized in that: The elastic clamping leg (42) comprises at least two sub-clamping legs (421) spaced apart along the limiting groove (41), and the end of each sub-clamping leg (421) has a clamping leg (422) extending to the center, and each clamping leg (422) can constrain the first sealing member (3) in the action unit (4).

4. The waterproof box according to claim 2, characterized in that: The limiting cap (5) comprises a first limiting part (52) and a second limiting part (53), the inlet end (5a) of the first limiting part (52) is provided with a sliding groove (521), the inlet end (5a) of the second limiting part (53) is provided with a sliding rail (531) slidingly matched with the sliding groove (521), the outlet end (5b) of the first limiting part (52) is provided with a buckle (522), and the outlet end (5b) of the second limiting part (53) is correspondingly provided with a clamping groove (332), and the first limiting part (52) and the second limiting part (53) are detachably connected and form the threading channel (51) by the cooperation of the sliding rail (531) and the sliding groove (521) and the cooperation of the buckle (522) and the clamping groove (332).

5. The waterproof box according to any one of claims 2 to 4, characterized in that: The first sealing member (3) comprises an inner first sealing section (3a) and an outer second sealing section (3b), the first sealing section (3a) is arranged in the limiting groove (41), the diameter of the second sealing section (3b) is greater than that of the first sealing section (3a), and the second sealing section (3b) is limited in the elastic clamping leg (42) and can be elastically deformed under the action of the elastic clamping leg (42) gathered to the center to tightly seal the cable in the second threading hole (31).

6. The waterproof box according to claim 5, characterized in that: The first sealing member (3) is provided with a wire passing groove (32) for the cable to be placed in the second threading hole (31), and the wire passing groove (32) communicates with the second threading hole (31) and penetrates the first sealing section (3a) and the second sealing section (3b).

7. The waterproof box according to any one of claims 1 to 4, characterized in that: The end of the first box body (1) and the second box body (2) is further formed with a mounting groove (12) on the inner side of the mounting part, and a second sealing element (6) is arranged in each mounting groove (12), each second sealing element (6) comprises at least two sealing pieces (61) and a connecting part (62) connecting the sealing pieces (61), each sealing piece (61) is arranged along the axis direction of the first threading hole (11), and the connecting part (62) connects the inner circumferential walls of the sealing pieces (61) and forms a third threading hole (63) communicating with the first threading hole (11) in the closed state.

8. The waterproof box according to claim 7, characterized in that: A positioning part (13) is arranged in the mounting groove (12), and a positioning groove (64) is formed between the adjacent sealing pieces (61) of the second sealing element (6), and the positioning part (13) can be inserted into the positioning groove (64).

9. The waterproof box according to claim 7, characterized in that: The closed part of the first box body (1) and the second box body (2) is further provided with a sealing ring (7), and the sealing ring (7) is integrally formed with the second sealing element (6) arranged on the first box body (1) and / or the second sealing element (6) arranged on the second box body (2).

10. The waterproof case according to any one of claims 1 to 4, characterized in that: The first box body (1) is provided with a buckle part (14), and the second box body (2) is correspondingly provided with a buckling part (21); or the second box body (2) is provided with a buckle part (14), and the first box body (1) is provided with a buckling part (21), and in the state that the buckle part (14) is buckled on the buckling part (21), the first box body (1) and the second box body (2) are kept in the closed state, and the first box body (1) and the second box body (2) can be separated from the buckling part (21) by applying force to the buckle part (14) to make it elastically deform.

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