Distribution box

Abstract

The utility model relates to the technical field of low-voltage complete electrical equipment, in particular to a distribution box, which comprises a box body, a first opening is arranged on the box body, a first door body and a second door body which are oppositely opened are arranged at the first opening, a first sealing bending part is arranged on one side of the first door body, and a second sealing bending part is arranged on one side of the second door body. A first sealing strip is arranged on the inner wall face of the second door body, the first sealing bent part comprises a sealing cavity with a cavity opening, when the first door body and the second door body seal the first opening, the second sealing bent part penetrates through the cavity opening to be attached to the inner side wall of the sealing cavity in a sealed mode, and the first sealing bent part abuts against the first sealing strip. The butt joint of the first door body and the second door body of the distribution box is provided with two-stage sealing, so that acid and alkali substances can be prevented from entering the distribution box from the butt joint to corrode a complete set of structures and electrical elements, and the service life of the distribution box is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage complete electrical equipment, in particular to a distribution box. Background Art

[0002] With the development of electrical technology, distribution boxes are widely used in all walks of life. In the animal husbandry industry, disinfection and cleaning are required regularly, and the environment where the distribution box is located is filled with a large amount of chlorine, ammonia and other particles. In a high humidity environment, acidic and alkaline substances with strong corrosive properties are formed. Acidic and alkaline substances can enter the distribution box from the gaps in the distribution box, causing fatal corrosion to the complete set of structures and electrical components, thereby affecting the normal operation and service life of the distribution box. In order to prevent acidic and alkaline substances from entering the distribution box from the gaps in the distribution box, it is necessary to improve the sealing of the distribution box to avoid gaps. In addition, in order to facilitate the installation and maintenance of complete sets of structures and electrical components, some distribution boxes are designed with double doors without column obstruction, and the joints of the two double doors are most likely to leave gaps, resulting in insufficient overall sealing of the distribution box.

[0003] Therefore, a distribution box is urgently needed to solve the above problems. Utility Model Content

[0004] The purpose of the utility model is to provide a distribution box, which can improve the sealing performance of the joint of the double-door, help prevent acid and alkali substances from entering the distribution box through the gap of the distribution box, prevent them from corroding the complete set of structures and electrical components, ensure the normal operation of the distribution box, and extend the service life.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] A distribution box is provided, comprising a box body, wherein the box body is provided with a first opening, wherein a first door body and a second door body which are arranged opposite to each other are provided at the first opening, wherein a first sealing bend portion is provided on one side of the first door body, wherein a second sealing bend portion is provided on one side of the second door body, wherein a first sealing strip is provided on the inner wall surface of the second door body, wherein the first sealing bend portion comprises a sealing cavity having a cavity opening, wherein when the first door body and the second door body seal the first opening, the second sealing bend portion passes through the cavity opening and is sealed and fitted with the inner wall of the sealing cavity, and wherein the first sealing bend portion abuts against the first sealing strip.

[0007] As a preferred solution of the distribution box, the first sealing bent portion includes a first side plate, a second side plate, a third side plate and a fourth side plate formed by bending, the first side plate, the second side plate, the third side plate and the fourth side plate are sequentially connected to surround and form the sealing cavity, the first side plate abuts against the first sealing strip, and the fourth side plate is vertically connected to the first door body;

[0008] The second sealing bending portion includes a sealing plate and a connecting plate. The sealing plate is attached to the inner wall of the third side plate. One end of the connecting plate is vertically connected to the sealing plate, and the other end is vertically connected to the second door body.

[0009] As a preferred solution for the distribution box, the outer wall of the box body is provided with a first bending edge around the first opening, and the other three sides of the first door body and the second door body are respectively provided with second bending edges, the first bending edge and the second bending edge are arranged to form a circumferential first water guiding cavity, and the first door body and the second door body are provided with a second sealing strip, the second sealing strip is arranged corresponding to the second bending edge, and the first bending edge abuts against the second sealing strip to block the first water guiding cavity and the inner cavity of the box body.

[0010] As a preferred solution for the distribution box, U-shaped docking pieces are provided at both ends of the first sealing bend portion, and avoidance gaps are correspondingly opened at both ends of the second sealing bend portion, at least a portion of each of the docking pieces can be inserted into the corresponding avoidance gap, and the side edges of the two docking pieces are both in contact with the first sealing strip.

[0011] As a preferred solution for the distribution box, the box body is made of aluminum-magnesium alloy.

[0012] As a preferred solution for the distribution box, the inner wall of the box body is covered with an inner electrostatic coating, and the outer wall of the box body is covered with an outer electrostatic coating.

[0013] As a preferred solution for the distribution box, the bottom plate of the box body is provided with cable inlet and outlet holes for the cables to pass through. A sealing structure is provided at the cable inlet and outlet holes for sealing the gap between the cable inlet and outlet holes and the cables.

[0014] As a preferred solution for the distribution box, it also includes a plurality of fans, which are arranged in the box at intervals.

[0015] As a preferred solution of the distribution box, it also includes a reinforcing plate, which is laid on the inner side of the back plate of the box body.

[0016] As a preferred solution of the distribution box, it also includes a hanging ear and a fixing piece, wherein the hanging ear is arranged on the outer side of the back plate of the box body, an adjustment hole is opened on the hanging ear, and the adjustment hole extends along the length direction of the hanging ear, and the fixing piece passes through the adjustment hole and is connected to the box body;

[0017] And / or, a handle is provided on the outer side of the box body, an auxiliary plate is provided on the inner side of the box body, a connecting piece passes through the handle and the box body and is connected to the auxiliary plate, and the handle and the auxiliary plate are both detachable.

[0018] Beneficial effects of the utility model:

[0019] The utility model provides a distribution box, by arranging a first sealing bend on one side of a first door body, arranging a second sealing bend on one side of a second door body, and arranging a first sealing strip on the inner wall surface of the second door body, the first sealing bend includes a sealing cavity with a cavity opening. When the first door body and the second door body are both closed to seal the first opening, the second sealing bend can pass through the cavity opening and seal with the inner wall of the sealing cavity, and a primary surface seal can be formed here, so that the connecting space between the external environment and the sealing cavity here is blocked. The first sealing bend abuts against the first sealing strip, and a secondary surface seal can be formed here, so that the connecting space between the sealing cavity and the inner cavity of the box here is blocked. The joint between the first door body and the second door body of the distribution box has two-level sealing, so that acidic and alkaline substances can be prevented from entering the distribution box from here, so as to prevent acidic and alkaline substances from corroding the complete set of structures and electrical components, ensure the normal operation of the distribution box, and extend the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a structural schematic diagram of a distribution box provided by an embodiment of the utility model from a first perspective;

[0021] Figure 2 It is a structural schematic diagram of the distribution box provided by the embodiment of the utility model from a second viewing angle;

[0022] Figure 3 yes Figure 2 The enlarged view of point A in the middle;

[0023] Figure 4 It is a structural schematic diagram of the distribution box provided by the embodiment of the utility model from a third perspective;

[0024] Figure 5 yes Figure 4 The enlarged view of point B in the middle;

[0025] Figure 6 yes Figure 4 Enlarged view of point C in the middle;

[0026] Figure 7 It is a structural schematic diagram of the distribution box provided by the embodiment of the utility model from a fourth perspective;

[0027] Figure 8 It is a first cross-sectional view of the distribution box (excluding the first sealing strip) provided by an embodiment of the utility model;

[0028] Fig. 9 yes Figure 8 The enlarged view of point D in the middle;

[0029] Fig.10It is a second cross-sectional view of the distribution box (excluding the second sealing strip) provided by the embodiment of the utility model;

[0030] Fig.11 yes Fig.10 Enlarged view of point E in the middle.

[0031] In the figure:

[0032] 1. Box body; 11. First bending edge; 12. Third bending edge; 13. Cable inlet and outlet holes;

[0033] 2. first door body; 21. first sealing bending portion; 211. first side plate; 212. fourth side plate; 213. second side plate; 214. third side plate; 22. second bending edge; 23. docking piece;

[0034] 3. second door body; 31. second sealing bending portion; 311. sealing plate; 312. connecting plate; 32. avoidance gap;

[0035] 4. First sealing strip; 5. Second sealing strip;

[0036] 6. The third door; 61. The fourth bending edge;

[0037] 7. Fan; 8. Reinforcement plate; 9. Hanging ear; 91. Adjustment hole; 10. Handle;

[0038] 100. Sealing cavity; 200. First water guiding cavity. DETAILED DESCRIPTION

[0039] The technical solution of the utility model is further described below in conjunction with the accompanying drawings and implementation methods. It is understood that the specific embodiments described herein are only used to explain the utility model, rather than to limit the utility model. It should also be noted that, for the convenience of description, only the parts related to the utility model are shown in the accompanying drawings, rather than all.

[0040] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0042] like Figure 1-Figure 2 As shown, the distribution box of this embodiment includes a box body 1, a first opening is provided on the box body 1, a first door body 2 and a second door body 3 arranged opposite to each other are provided at the first opening, and the first door body 2 and the second door body 3 are both hinged to the box body 1.

[0043] like Figure 8-Figure 9 As shown, a first sealing bend 21 is provided on one side of the first door body 2, a second sealing bend 31 is provided on one side of the second door body 3, a first sealing strip 4 is provided on the inner wall surface of the second door body 3, and the first sealing bend 21 includes a sealing cavity 100 with a cavity opening. Optionally, the first sealing bend 21 is provided close to the second door body 3, and the second sealing bend 31 is provided close to the first door body 2.

[0044] When the first door body 2 and the second door body 3 seal the first opening, the second sealing bend 31 passes through the cavity opening and seals against the inner wall of the sealed cavity 100, and a primary surface seal is formed here, so that the connecting space between the external environment and the sealed cavity 100 is blocked. The first sealing bend 21 abuts against the first sealing strip 4, and a secondary surface seal is formed here, so that the connecting space between the sealed cavity 100 and the inner cavity of the box body 1 is blocked. The joint between the first door body and the second door body of the distribution box has two levels of sealing, which can prevent acidic and alkaline substances from entering the distribution box from here, so as to prevent acidic and alkaline substances from corroding the complete structure and electrical components, ensure the normal operation of the distribution box, and extend its service life.

[0045] like Fig. 9 As shown, preferably, the first sealing bending portion 21 is bent to form four plate surfaces, and the four plate surfaces are arranged to form a sealed cavity 100. The four plate surfaces include a first side plate 211, a second side plate 213, a third side plate 214 and a fourth side plate 212 formed by bending. The first side plate 211, the second side plate 213, the third side plate 214 and the fourth side plate 212 are sequentially connected to form the sealed cavity 100. Optionally, in this embodiment, the sealed cavity 100 is in the form of a rectangular parallelepiped. The first side plate 211 abuts against the first sealing strip 4, and the fourth side plate 212 is vertically connected to the first door body 2.

[0046] The second sealing bending portion 31 includes a sealing plate 311 and a connecting plate 312 . The sealing plate 311 is attached to the inner wall of the third side plate 214 . One end of the connecting plate 312 is vertically connected to the sealing plate 311 , and the other end is vertically connected to the second door body 3 .

[0047] Optionally, the sealing plate 311 of the second sealing bend portion 31 is parallel to the third side plate 214 and fits the surface of the third side plate 214 facing the sealing cavity 100, so that a surface seal is formed between the sealing plate 311 and the third side plate 214, which can prevent droplets or corrosive gases from entering the sealing cavity 100 from the outside.

[0048] The first side panel 211 is arranged parallel to and spaced apart from the second door body 3, and the first side panel 211 abuts against the first sealing strip 4 on the inner side of the second door body 3, so that a secondary surface seal can be formed at the first side panel 211, thereby preventing droplets or corrosive gases that have entered the sealed cavity 100 from entering the interior of the box body 1 through the gap between the first side panel 211 and the second door body 3.

[0049] like Figure 2-Figure 4 as well as Figure 10-11 As shown, in order to ensure that the first door body 2 and the box body 1 can be sealed together, and the second door body 3 and the box body 1 can be sealed together, preferably, the outer wall of the box body 1 is provided with a first bending edge 11 around the first opening, and the remaining three sides of the first door body 2 and the second door body 3 are respectively provided with second bending edges 22. That is, the upper side, left side, and lower side of the first door body 2 and the upper side, right side, and lower side of the second door body 3 are all provided with second bending edges 22, so that when the first door body 2 and the second door body 3 are closed, the second bending edges 22 of the two form a ring, surrounding the first opening of the box body 1. The first bending edge 11 and the second bending edge 22 surround a circumferential first water guide cavity 200, and the first door body 2 and the second door body 3 are provided with a second sealing strip 5, which is arranged corresponding to the second bending edge 22, and the first bending edge 11 abuts against the second sealing strip 5 to block the first water guide cavity 200 and the inner cavity of the box body 1.

[0050] like Fig.11 As shown, optionally, the first bent edge 11 includes a first plate vertically connected to the front panel of the box body 1, and a second plate connected to the first plate. In this embodiment, the second plate extends obliquely upward, and the second plate abuts against the second sealing strip 5 provided on the inner walls of the first door body 2 and the second door body 3 to prevent liquid or corrosive gas from entering the box body 1 from the gap there.

[0051] Optionally, the cross-section of the second bent edge 22 is an L-shaped structure. Taking the second bent edge 22 on the first door body 2 as an example, the third plate of the second bent edge 22 is vertically connected to the main body of the first door body 2, the fourth plate is vertically connected to the third plate, and the fourth plate is parallel to the front panel of the box body 1.

[0052] like Figure 2-Figure 6 As shown, preferably, U-shaped docking pieces 23 are provided at both ends of the first sealing bend 21, and avoidance notches 32 are correspondingly opened at both ends of the second sealing bend 31, at least a portion of each docking piece 23 can be inserted into the corresponding avoidance notch 32, and the sides of the two docking pieces 23 are both in contact with the first sealing strip 4.

[0053] Optionally, the opening of the U-shaped structure of the docking piece 23 is opened horizontally, and the U-shaped structure is opened through along the extension direction of the upper and lower sides of the first door body 2. The first door body 2 needs to be closed first, and then the second door body 3, so that the docking piece 23 is just located at the avoidance gap 32. The setting of the docking piece 23 can prevent the top of the first sealing bent portion 21 from leaking liquid.

[0054] Preferably, the distribution box further comprises a third door 6, the box body 1 further comprises a second opening, the third door 6 is hinged to the box body 1, and the third door 6 can seal the second opening. Optionally, a third bending edge 12 is further provided on the outer wall of the box body 1, the third bending edge 12 is arranged around the outside of the second opening, the third door 6 is circumferentially provided with a fourth bending edge 61 at the position corresponding to the second opening, and the third bending edge 12 and the fourth bending edge 61 are buckled to form a circumferential second water guide cavity. Preferably, the third door 6 is also provided with a sealing strip, the sealing strip is circumferentially provided corresponding to the second opening of the box body 1, and the third bending edge 12 circumferentially abuts against the sealing strip to ensure that the third door 6 is in a sealed state with the box body 1 when the third door 6 is closed.

[0055] Since the box body 1 is in a sealed state as a whole, in order to improve the heat exchange efficiency between the box body 1 and the external environment and ensure that the internal temperature meets the optimal operating temperature range of the electrical components, the box body 1 in this embodiment optionally uses AL-Mg5052 aluminum-magnesium alloy plate, the thermal conductivity of which is about 238W / (m·K). The thermal conductivity of 304 stainless steel plate in the industry is about 15.2W / (m·K). The use of 5052 aluminum-magnesium alloy plate can greatly improve the heat conduction efficiency of the box body 1. In addition, the density of AL-Mg5052 aluminum-magnesium alloy plate is 2.72g / cm 3 , the density of 304 stainless steel plate is 7.93g / cm 3 By adopting the former to manufacture a box 1 of the same volume, the weight can be reduced by one third.

[0056] In order to ensure that the heat of the electrical components in the box body 1 can be quickly dissipated in a sealed state to achieve a cooling effect, preferably, the distribution box further includes a plurality of fans 7, and the plurality of fans 7 are arranged at intervals in the box body 1. Optionally, in this embodiment, two fans 7 are provided, and the two fans 7 are arranged at intervals on the inner side wall of the back plate of the box body 1 and close to the top plate of the box body 1. Optionally, both fans 7 are axial flow fans.

[0057] In order to ensure the structural strength of the box 1, preferably, the distribution box further comprises a reinforcing plate 8, which is laid on the inner side of the back plate of the box 1. Optionally, 6 M10 carriage studs are used to penetrate the box 1 and the reinforcing plate 8 to improve the overall strength of the box 1.

[0058] like Figure 7 As shown, preferably, the distribution box also includes a hanging ear 9 and a fixing part. The hanging ear 9 is arranged on the outer side of the back plate of the box body 1. An adjustment hole 91 is opened on the hanging ear 9. The adjustment hole 91 extends along the length direction of the hanging ear 9. The fixing part is connected to the box body 1 through the adjustment hole 91. The hanging ear 9 can move relative to the fixing part along the extension direction of the adjustment hole 91 to adjust the position of the hanging ear 9 relative to the box body 1 for easy use.

[0059] Optionally, two parallel adjustment holes 91 are provided on each hanging ear 9, and two fixing members pass through the two adjustment holes 91 respectively to fix the hanging ear 9. Optionally, the hanging ear 9 can be adjusted up and down and left and right by using a blind hole rivet nut assembly method, which is convenient for transportation and on-site fixing and adjustment.

[0060] Preferably, a handle 10 is provided on the outside of the box body 1, an auxiliary plate is provided on the inside of the box body 1, a connector passes through the handle 10 and the box body 1 and is connected to the auxiliary plate, and both the handle 10 and the auxiliary plate are detachable, which facilitates the transportation of the box body 1 and eliminates the possibility of deformation of the box body 1 due to transportation. Bolts can be used to pass through the handle 10 and the box body 1 in sequence and screwed to the threaded holes on the auxiliary plate to form a detachable connection.

[0061] In order to prevent the box body 1 from being corroded, an electrostatic spraying process is adopted both inside and outside the box body 1, that is, the inner wall of the box body 1 is covered with an inner electrostatic coating, and the outer wall of the box body 1 is covered with an outer electrostatic coating. The thickness of the outer electrostatic coating is greater than or equal to 90um, and the thickness of the inner electrostatic coating is greater than or equal to 45um, so as to improve the corrosion resistance of the plate.

[0062] In addition, the top, bottom and back of the box body 1 are formed by bending a whole plate up and down, and the left and right sides are assembled and fully welded with the same plate, so as to ensure the overall sealing of the box body 1.

[0063] A cable inlet and outlet hole 13 is provided at the bottom of the box 1 for the cable to pass through. A sealing structure is provided at the cable inlet and outlet hole 13 for sealing the gap between the cable inlet and outlet hole 13 and the cable. Optionally, a cable gland or fireproof mud is used to seal the cable inlet and outlet hole 13 during cable construction.

[0064] The heat generated by the electrical components in the distribution box is exchanged with the plate of the box 1 through air flow, and the heat of the plate of the box 1 is dissipated into the external environment, thereby realizing heat conduction between the inside and outside of the distribution box. The box 1 adopts a sealed structure to isolate external liquids and air from entering the box, thereby ensuring that the metal parts and electrical components in the box 1 are not corroded by acid and alkali substances in the external air, and that the liquid will not cause a short circuit fault or component damage. Therefore, the distribution box can adapt to the harsh environment of high humidity and strong corrosion in animal husbandry, ensure normal operation, and have a longer service life.

[0065] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A distribution box, characterized in that: The invention comprises a box body (1), wherein the box body (1) is provided with a first opening, wherein a first door body (2) and a second door body (3) which are arranged to open in opposite directions are provided at the first opening, wherein a first sealing bend portion (21) is provided on one side of the first door body (2), and a second sealing bend portion (31) is provided on one side of the second door body (3), and a first sealing strip (4) is provided on the inner wall surface of the second door body (3), wherein the first sealing bend portion (21) comprises a sealing cavity (100) having a cavity opening, and when the first door body (2) and the second door body (3) seal the first opening, the second sealing bend portion (31) passes through the cavity opening and is sealed to the inner wall of the sealing cavity (100), and the first sealing bend portion (21) abuts against the first sealing strip (4).

2. The distribution box according to claim 1, characterized in that: The first sealing bent portion (21) comprises a first side plate (211), a second side plate (213), a third side plate (214) and a fourth side plate (212) formed by bending, the first side plate (211), the second side plate (213), the third side plate (214) and the fourth side plate (212) are sequentially connected to surround and form the sealing cavity (100), the first side plate (211) is in contact with the first sealing strip (4), and the fourth side plate (212) is vertically connected to the first door body (2); The second sealing bending portion (31) includes a sealing plate (311) and a connecting plate (312), wherein the sealing plate (311) is attached to the inner wall of the third side plate (214), and one end of the connecting plate (312) is vertically connected to the sealing plate (311), and the other end is vertically connected to the second door body (3).

3. The distribution box according to claim 1, characterized in that: The first opening is provided with a first bending edge (11) on the outer wall of the box body (1), and the remaining three sides of the first door body (2) and the second door body (3) are respectively provided with second bending edges (22). The first bending edge (11) and the second bending edge (22) are arranged to form a circumferential first water guide cavity (200). The first door body (2) and the second door body (3) are provided with a second sealing strip (5), and the second sealing strip (5) is arranged corresponding to the second bending edge (22). The first bending edge (11) abuts against the second sealing strip (5) to block the first water guide cavity (200) and the inner cavity of the box body (1).

4. The distribution box according to claim 1, characterized in that: Both ends of the first sealing bend (21) are provided with U-shaped docking pieces (23), and both ends of the second sealing bend (31) are provided with corresponding avoidance notches (32), at least a portion of each docking piece (23) can be inserted into the corresponding avoidance notch (32), and the sides of the two docking pieces (23) are both in contact with the first sealing strip (4).

5. The distribution box according to any one of claims 1 to 4, characterized in that: The box body (1) is made of aluminum-magnesium alloy.

6. The distribution box according to any one of claims 1 to 4, characterized in that: The inner wall of the box body (1) is covered with an inner electrostatic coating, and the outer wall of the box body (1) is covered with an outer electrostatic coating.

7. The distribution box according to any one of claims 1 to 4, characterized in that: The bottom plate of the box body (1) is provided with a cable inlet and outlet hole (13), the cable inlet and outlet hole (13) is used for the cable to pass through, and a sealing structure is provided at the cable inlet and outlet hole (13), the sealing structure is used to block the gap between the cable inlet and outlet hole (13) and the cable.

8. The distribution box according to any one of claims 1 to 4, characterized in that: It also comprises a plurality of fans (7), wherein the plurality of fans (7) are arranged at intervals in the box body (1).

9. The distribution box according to any one of claims 1 to 4, characterized in that: It also comprises a reinforcing plate (8), wherein the reinforcing plate (8) is laid on the inner side of the back plate of the box body (1).

10. The distribution box according to any one of claims 1 to 4, characterized in that: It also comprises a hanging ear (9) and a fixing piece, wherein the hanging ear (9) is arranged on the outer side of the back plate of the box body (1), an adjustment hole (91) is opened on the hanging ear (9), and the adjustment hole (91) extends along the length direction of the hanging ear (9), and the fixing piece passes through the adjustment hole (91) and is connected to the box body (1); And / or, a handle (10) is provided on the outer side of the box body (1), an auxiliary plate is provided on the inner side of the box body (1), a connecting piece passes through the handle (10) and the box body (1) and is connected to the auxiliary plate, and both the handle (10) and the auxiliary plate are detachable.

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