Multifunctional high strength high explosion proof grade explosion proof box

Abstract

The present invention provides a multifunctional high-strength high-explosion-proof grade explosion-proof box, which solves the problems of insufficient explosion-proof ability of conventional welded explosion-proof boxes, and includes a box body and a cover body that closes the box body, the box body has a rectangular or square outer shell and a cylindrical inner shell that is arranged inside the outer shell, the outer shell and the inner shell are connected as one, the bottom of the inner shell is closed and the interior is a cylindrical cavity, the upper end opening of the inner shell is closed by the cover body, and the upper end of the inner shell is provided with a cover mouth that protrudes upward relative to the box body, the outer side of the cover mouth is polygonal and the inner side is a circular mouth that is flush with the inner wall of the inner shell. The present invention has the advantages of strong explosion-proof ability, convenient and fast production, etc.

Description

Technical Field

[0001] The invention belongs to the technical field of explosion-proof boxes, and in particular relates to a multifunctional high-strength and high-explosion-proof grade explosion-proof box. Background Art

[0002] With the development of the national economy, explosion-proof electrical products are more widely used in flammable and explosive places in industries such as petroleum, chemical industry, military industry, coal, textile, medicine, food processing and marine transportation. And with the expansion of the sales market, in order to adapt to the different ambient temperatures at home and abroad, especially in some areas where the ambient temperature can reach -60℃ or +55℃, in order to meet market demand and reduce the company's products and inventory types, it is necessary to meet different needs. In real life, explosion-proof boxes such as explosion-proof boxes, explosion-proof control boxes, explosion-proof wiring boxes, etc. have different explosion-proof performance requirements in different material design concepts. There is a special manufacturing industry for the explosion-proof box shell on the market now. Then, according to different environments and requirements, the explosion-proof box shell can be divided into the most commonly used aluminum, engineering plastics, steel plates, stainless steel, etc., of course, there are some special requirements for non-standard such as 316 stainless steel, etc. For modern enterprises, the explosion-proof equipment environment required by national units, different explosion-proof box equipment, and explosion-proof electrical products have certain strict requirements. At present, the conventional explosion-proof box has poor structural strength and poor resistance to explosion pressure. In addition, the explosion-proof box is large in size and cannot be used in occasions with small installation space.

[0003] In order to solve the deficiencies of the existing technology, people have conducted long-term exploration and proposed various solutions. For example, a Chinese patent document discloses a IIC-level welded explosion-proof box [201720959141.5], which includes a box body and an upper cover. The box body includes a surrounding body, a bottom plate, and a top plate fixed to the upper part of the surrounding body and with a hole in the middle. The surrounding body is formed by bending a metal plate and welding it at the joint, including multiple plane walls and multiple corner walls located between each two adjacent plane walls. The bottom plate is a polygon with the same number of sides as the number of plane walls. The lower edge of the surrounding body is welded to the bottom plate to form a whole, and the corner of the bottom plate extends outward from the lower edge of the corner wall.

[0004] The above solution solves the problem of the large size of the explosion-proof box to a certain extent, but the solution still has many shortcomings, such as poor structural strength and inability to withstand large explosion pressure. Summary of the invention

[0005] The purpose of the present invention is to provide a multifunctional high-strength and high-explosion-proof grade explosion-proof box with reasonable design and good structural strength in view of the above problems.

[0006] To achieve the above-mentioned purpose, the present invention adopts the following technical solutions: the multifunctional high-strength high-explosion-proof grade explosion-proof box includes a box body and a cover body that closes the box body, the box body has a rectangular or square outer shell and a cylindrical inner shell arranged inside the outer shell, the outer shell and the inner shell are connected as one, the bottom of the inner shell is closed and the interior is a cylindrical cavity, the upper end opening of the inner shell is closed by the cover body, and the upper end of the inner shell is provided with a cover mouth that protrudes upward relative to the box body, the outer side of the cover mouth is polygonal and the inner side is a circular mouth flush with the inner wall of the inner shell. The box body adopts a structure of outer square and inner circle, the internal cavity is also cylindrical and integrally formed, and has stronger explosion resistance than other welded explosion-proof boxes.

[0007] In the above-mentioned multifunctional high-strength high-explosion-proof grade explosion-proof box, a cavity is left between the outer side of the inner shell and the vertical corners of the outer shell, the outer shell is square and a reinforcing plate is vertically arranged between the inner shell, the central plane of the reinforcing plate is opposite to the central axis of the box, the bottom of the inner shell is provided with upwardly protruding circular ribs and several pairs of ribs symmetrically arranged relative to the center of the circular ribs, one pair of ribs passes through the circular ribs, and several fixed platforms connected to the support plate are arranged above the ribs, and chamfered surfaces are opened on the outer side of the vertical corners around the box, and a fixing seat is arranged at the lower end of the chamfered surface. A reinforcing structure is arranged between the corners of the inner shell and the outer shell to further improve its structural stability, and a plane is left above it for easy connection with the cover body.

[0008] In the above-mentioned multifunctional high-strength high-explosion-proof grade explosion-proof box, the box body and the cover body are connected by threads or hinges, and the cover body includes a threaded cover threadedly connected to the inner side of the upper opening of the inner shell body and a flip cover flipped and connected to the upper end of the outer shell body. Different sealing methods are used for the box body and the cover body according to actual needs.

[0009] In the above-mentioned multifunctional high-strength high-explosion-proof grade explosion-proof box, the threaded cover includes a threaded barrel threadedly connected to the box opening, a screw cap that closes the upper opening of the inner shell is fixed on the upper end of the threaded barrel, a conical surface surrounding the circumference of the screw cap is distributed on the side of the screw cap, a reinforcement ring and a reinforcement strip arranged between the reinforcement ring and the inner side of the screw cap are arranged below the screw cap, and relative positioning screw holes are arranged above the screw cap and the box opening, and the screw cap is kept fixed with the box body by the positioning bolts connected between the positioning screw holes. The threaded cover can be sealed by rotation, and its circumferential rotation angle is fixed by the positioning screw hole after it is completely closed to prevent it from loosening.

[0010] In the above-mentioned multifunctional high-strength high-explosion-proof grade explosion-proof box, the flip cover includes a plug-in barrel plugged into the box opening, a step surface that fits the plug-in barrel is provided on the inner side of the upper end of the inner shell, a plug-in cover that closes the upper end opening of the inner shell is fixed to the upper end of the plug-in barrel, and a conical surface surrounding the plug-in cover is distributed on the side of the plug-in cover along the circumference of the plug-in cover, and handle grooves are provided on both sides of the outer side of the plug-in cover. A plurality of hinge mounting holes for fixing the hinge are provided between one side of the plug-in cover and the upper end of the box, and a plurality of threaded seats are provided on the plug-in cover, and a plurality of opposite connecting screw holes are provided between the center of the threaded seat and the upper end of the box, and connecting bolts are provided between the connecting screw holes, and a plurality of lifting bolts opposite to the upper end of the box are threadedly connected on the plug-in cover. The flip cover is connected to the box by plugging and sealed by the connecting bolts, and the box and the cover can be separated by rotating the lifting bolts.

[0011] In the above-mentioned multifunctional high-strength high-explosion-proof grade explosion-proof box, the connecting hinge includes a movable sleeve fixedly connected to the box body, a movable shaft that can move up and down relative to the movable sleeve is installed in the movable sleeve, the movable shaft is rotatably connected to a movable part through a pin shaft, the other end of the movable part is fixedly connected to one side of the cover body, a limiting mechanism for limiting the circumferential rotation angle of the movable part and the cover body is provided between the movable part and the cover body, an anti-slip mechanism for preventing the movable shaft from falling off the movable sleeve is provided between the movable shaft and the movable sleeve, and a polygonal mounting surface is provided on the side of the movable sleeve and the movable part. The movable part and the movable shaft in the connecting hinge can be lifted up and down relative to the movable sleeve, thereby realizing the up and down movement of the cover body to improve its sealing.

[0012] In the above-mentioned multifunctional high-strength high-explosion-proof explosion-proof box, the movable sleeve includes a mounting sleeve threadedly connected to the hinge mounting hole on the top of the box body, a limit sleeve is fixed on the upper end of the mounting sleeve and fits the top of the box body, and the anti-slip mechanism includes a riveting edge arranged at the lower end of the movable shaft, the riveting edge is opposite to the limit surface below the movable sleeve, and a deep hole is reserved in the hinge mounting hole for the movable shaft to move up and down. The movable sleeve is connected to the box body through the mounting sleeve, and the anti-slip mechanism between them limits its upward and downward movement range.

[0013] In the above-mentioned multifunctional high-strength high-explosion-proof grade explosion-proof box, the movable part includes a connecting section threadedly connected to the cover body and a limit block fitted with the bottom of the cover body, the limit mechanism includes a limit notch arranged on the side of the limit block, a screw hole opposite to the limit notch is opened under the cover body, and a limit screw engaged with the limit notch is threadedly connected in the screw hole. The movable part is connected to the cover body through the connecting section, and the limit mechanism limits its circumferential angle to ensure the connection stability.

[0014] In the above-mentioned multifunctional high-strength high-explosion-proof explosion-proof box, a rotating head is provided at the end of the movable part, the rotating head is clamped in the rotating groove at the end of the movable shaft, a rotating hole for the pin shaft to be plugged is provided in the center of the rotating head and the end of the movable shaft, the ends of the movable part and the movable shaft are round heads, the rotating angle range of the movable part and the movable shaft is not less than 180°, an outer flared opening is provided on the outer side of the rotating hole of the movable shaft, and a pressing head that is pressed and matched with the outer flared opening is provided at both ends of the pin shaft, and the diameter of the rotating head of the movable part is equal to the diameter of the movable shaft. The movable part and the movable shaft can rotate freely, thereby ensuring that the upper end of the inner shell is fully opened.

[0015] In the above-mentioned multifunctional high-strength high-explosion-proof grade explosion-proof box, a sealing ring is arranged between the threaded cover or flip cover and the upper opening of the inner shell, and a plurality of wiring holes are opened on the side of the box body, which are connected to the inner cavity of the inner shell body and arranged in a matrix. The wiring holes are threaded holes, and the corners of the box body and the cover body are rounded. The sealing ring has a certain elasticity to ensure the internal airtightness after the box body and the cover body are closed. The wiring holes on the outside have internal threads to facilitate the plugging and fixing of the wires. The box body and the cover body are respectively an integrated structure, which is convenient for casting and molding, thereby improving the processing and production efficiency.

[0016] Compared with the existing technology, the advantages of the present invention are: the box body adopts an outer square and inner circle structure and is integrally formed, and the internal cavity is cylindrical, so it has higher structural strength and explosion resistance; the outer side of the box body is square, which is convenient for splicing and combining multiple boxes and increasing the overall strength after splicing; the cover body can be sealed by rotating and plugging, which can achieve relative separation of the cover body and the box body and improve safety during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the present invention;

[0018] Figure 2 It is another structural schematic diagram of the present invention;

[0019] Figure 3 yes Figure 1 Structural cross-sectional view of

[0020] Figure 4 yes Figure 2 Structural cross-sectional view of

[0021] Figure 5 It is a structural schematic diagram of the box body of the present invention;

[0022] Figure 6 It is a structural schematic diagram of the box body of the present invention from another perspective;

[0023] Figure 7 It is a schematic structural diagram of the flip cover of the present invention;

[0024] Figure 8It is a structural schematic diagram of the threaded cover of the present invention;

[0025] Fig. 9 is a structural schematic diagram of a connecting hinge of the present invention;

[0026] Fig.10 is a structural schematic diagram of the connecting hinge of the present invention from another perspective;

[0027] Fig.11 is an assembly cross-sectional view of the connecting hinge of the present invention;

[0028] In the figure, box body 1, outer shell 11, inner shell 12, sealing ring 121, wiring hole 122, reinforcing plate 13, round rib 14, strip rib 15, supporting plate 16, fixing platform 17, chamfered surface 18, fixing seat 19, cover body 2, cover mouth 3, threaded cover 4, threaded cylinder 41, screw cover 42, reinforcing ring 43, reinforcing strip 44, positioning screw hole 45, positioning bolt 46, flip cover 5, plug-in cylinder 51, step surface 52, plug-in cover 53, handle groove 54, hinge mounting hole 55, threaded seat 5 6. connecting screw hole 57, connecting bolt 58, lifting bolt 59, connecting hinge 6, movable sleeve 61, mounting sleeve 611, limiting sleeve 612, movable shaft 62, pin shaft 63, movable part 64, connecting section 641, limiting block 642, rotating head 65, rotating groove 66, rotating hole 67, outward expansion mouth 68, clamping head 69, limiting mechanism 7, limiting notch 71, screw hole 72, limiting screw 73, anti-slip mechanism 8, riveting edge 81, limiting surface 82, deep hole 83, polygonal mounting surface 9. DETAILED DESCRIPTION

[0029] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] like Figure 1-11 As shown, the multifunctional high-strength high-explosion-proof grade explosion-proof box includes a box body 1 and a cover body 2 that closes the box body 1. The box body 1 has a rectangular or square outer shell 11 and a cylindrical inner shell 12 that is arranged inside the outer shell 11. The outer shell 11 and the inner shell 12 are connected as a whole. The bottom of the inner shell 12 is closed and the interior is a cylindrical cavity. The upper end opening of the inner shell 12 is closed by the cover body 2. The upper end of the inner shell 12 is provided with a cover 3 that protrudes upward relative to the box body 1. The outer side of the cover 3 is polygonal and the inner side is a circular opening flush with the inner wall of the inner shell 12. The outer shell 11 and the inner shell 12 are connected as a whole. The upper inner opening of the inner shell 12 is closed by the cover body 2. The box body 1 and the cover body 2 are made of Q235 carbon steel, 304, 316 stainless steel or aluminum alloy materials. The whole is cast and the size is adjusted according to actual needs.

[0031] Specifically, a cavity is left between the outer side of the inner shell 12 and the vertical corners of the outer shell 11. The outer shell 11 is square and a reinforcing plate 13 is vertically arranged between the inner shell 12. The central plane of the reinforcing plate 13 is opposite to the central axis of the box 1. The bottom of the inner shell 12 is provided with a circular rib 14 protruding upward and a plurality of pairs of bar ribs 15 arranged symmetrically relative to the circular rib 14. One pair of bar ribs 15 passes through the circular rib 14. A plurality of fixed platforms 17 connected to the supporting plate 16 are arranged above the bar rib 15. A chamfered surface 18 is opened on the outer side of the vertical corners around the box 1, and a fixing seat 19 is arranged at the lower end of the chamfered surface 18. The reinforcing plate 13 between the inner shell 12 and the outer shell 11 improves its explosion resistance and increases a certain multiple of the safety margin. The outer side of the outer shell 11 is a vertical plane around the outer side. The fixing seat 19 below ensures the stability of the box 1 and has relative mounting holes at the bottom. The side of the inner shell 1 is connected to the middle of the vertical surface of the outer shell 11 as a whole.

[0032] In depth, the box body 1 is connected to the cover body 2 by a threaded or hinged manner, and the cover body 2 includes a threaded cover 4 threadedly connected to the inner side of the upper opening of the inner shell 12 and a flip cover 5 flipped and connected to the upper end of the outer shell 11. The box body 1 has a fixed structure, and the threaded cover 4 or the flip cover 5 is selected according to actual needs to meet different opening and closing requirements.

[0033] Furthermore, the threaded cover 4 includes a threaded barrel 41 threadedly connected to the opening of the box body 1, a screw cap 42 is fixed at the upper end of the threaded barrel 41 to close the upper opening of the inner shell 12, a cone is distributed on the side of the screw cap 42 along the circumference of the screw cap 42, a reinforcement ring 43 and a reinforcement strip 44 arranged between the reinforcement ring 43 and the inner side of the screw cap 42 are arranged below the screw cap 42, and a relative positioning screw hole 45 is arranged above the screw cap 42 and the opening of the box body 1, and the screw cap 42 is kept fixed in the circumferential rotation angle with the box body 1 by a positioning bolt 46 connected between the positioning screw holes 45. When the threaded cover 4 is rotated, the threaded barrel 41 is screwed into the upper opening of the inner shell 12, and the screw cap 42 presses and seals the polygonal cover opening 3, and the reinforcement ring 43 and reinforcement strip 44 inside the screw cap 42 improve the anti-deformation ability of the threaded cover 4.

[0034] Furthermore, the flip cover 5 includes a plug-in tube 51 which is plugged into the opening of the box body 1, a step surface 52 which fits the plug-in tube 51 is provided on the inner side of the upper end of the inner shell body 12, a plug-in cover 53 which closes the upper end opening of the inner shell body 12 is fixed to the upper end of the plug-in tube 51, and a conical surface which surrounds the plug-in cover 53 along the circumference is distributed on the side of the plug-in cover 53, and handle grooves 54 are provided on both sides of the outside of the plug-in cover 53, and a plurality of hinge mounting holes 55 for fixing the hinge 6 are provided between one side of the plug-in cover 53 and the upper end of the box body 1, a plurality of threaded seats 56 are provided on the plug-in cover 53, a plurality of connecting screw holes 57 which are opposite to each other are provided between the center of the threaded seat 56 and the upper end of the box body 1, and connecting bolts 58 are provided between the connecting screw holes 57, and a plurality of lifting bolts 59 which are opposite to the upper end of the box body 1 are threadedly connected to the plug-in cover 53. The flip cover 5 is flipped relative to the box body 1 through the connecting hinge 6, and the plug-in tube 51 below it is plugged into the step surface 52 at the upper opening of the inner shell 12, and the handle grooves 54 on both sides of the plug-in cover 53 facilitate manual flipping. After the flip cover 5 and the box body 1 are sealed, the connecting bolts 58 are rotated and a certain pre-tightening force is applied to ensure the connection stability of the flip cover 5 and the box body 1. When the flip cover 5 needs to be opened, the lifting bolts 59 around the flip cover 5 are evenly rotated to make the flip cover 5 rise relative to the box body 1, so that it is convenient for it to rotate relative to the connecting hinge 6.

[0035] In addition, the connecting hinge 6 includes a movable sleeve 61 fixedly connected to the box body 1, a movable shaft 62 that can move up and down relative to the movable sleeve 61 is installed in the movable sleeve 61, the movable shaft 62 is rotatably connected to a movable part 64 through a pin shaft 63, the other end of the movable part 64 is fixedly connected to one side of the cover body 2, a limiting mechanism 7 is provided between the movable part 64 and the cover body 2 to limit the circumferential rotation angle of the movable part 64 and the cover body 2, an anti-slip mechanism 8 is provided between the movable shaft 62 and the movable sleeve 61 to prevent the movable shaft 62 from falling off the movable sleeve 61, and a polygonal mounting surface 9 is provided on the side of the movable sleeve 61 and the movable part 64. During installation, the movable shaft 62 is inserted into the movable sleeve 61 and is rotatably connected to the movable part 64, the movable sleeve 61 is rotatably connected to the hinge mounting hole 55 above the corner of the box body 1, and the movable part 64 is rotatably connected to the hinge mounting hole 55 below the corner of the cover body 2. When the cover body 2 is rotated and closed with the box body 1 by connecting the hinge 6, the cover body 2 is pressed down, the movable shaft 62 descends relative to the movable sleeve 61, and the lifting bolt 59 is rotated upward to ensure that the cover body 2 descends smoothly.

[0036] At the same time, the movable sleeve 61 includes a mounting sleeve 611 threadedly connected to the hinge mounting hole 55 above the box body 1, and a limiting sleeve 612 is fixed to the upper end of the mounting sleeve 611 and fits the upper part of the box body 1. The anti-slip mechanism 8 includes a riveting edge 81 arranged at the lower end of the movable shaft 62, and the riveting edge 81 is opposite to the limiting surface 82 below the movable sleeve 61. A deep hole 83 for the movable shaft 62 to move up and down is reserved in the hinge mounting hole 55. The riveting edge 81 abuts against the limiting surface 82 at the lower end of the movable sleeve 61 to prevent the movable shaft 62 from falling off from the movable sleeve 61 after installation. The deep hole 83 at the lower end of the hinge mounting hole 55 provides a margin for the movable shaft 62 to stretch up and down.

[0037] It can be seen that the movable member 64 includes a connecting section 641 threadedly connected to the cover body 2 and a limiting block 642 fitted with the bottom of the cover body 2, and the limiting mechanism 7 includes a limiting notch 71 arranged on the side of the limiting block 642. A screw hole 72 opposite to the limiting notch 71 is opened at the bottom of the cover body 2, and a limiting screw 73 engaged with the limiting notch 71 is threadedly connected in the screw hole 72. When the movable member 64 and the cover body 2 rotate to a relative position, the limiting block 642 fits and abuts against the bottom thereof, and at the same time, the limiting screw 73 is screwed into the screw hole 72 and engaged with the limiting notch 71 to prevent the movable member 64 from continuing to rotate.

[0038] Obviously, a rotating head 65 is provided at the end of the movable member 64, and the rotating head 65 is clamped in the rotating groove 66 at the end of the movable shaft 62. A rotating hole 67 for the pin shaft 63 to be inserted is provided in the center of the rotating head 65 and the end of the movable shaft 62. The ends of the movable member 64 and the movable shaft 62 are round heads. The rotating angle range of the movable member 64 and the movable shaft 62 is not less than 180°. An outer flared opening 68 is provided on the outer side of the rotating hole of the movable shaft 62. A pressing head 69 that is pressed and matched with the outer flared opening 68 is provided at both ends of the pin shaft 63. The diameter of the rotating head 65 of the movable member 64 is equal to the diameter of the movable shaft 62. The rotating head 65 is a flat head. After being inserted into the rotating groove 66, it rotates relative to the pin shaft 63. The pressing heads 69 at both ends of the pin shaft 63 are filled and fixed with the outer flared opening 68 by pressing. When the central axis of the movable member 64 is consistent with the movable shaft 62 , the movable member 64 can slide downward into the movable sleeve 61 to prevent the movable member 64 and the movable shaft 62 from rotating relative to each other.

[0039] Preferably, a sealing ring 121 is provided between the threaded cover 4 or the flip cover 5 and the upper opening of the inner shell 12. A plurality of wiring holes 122 are provided on the side of the box body 1 and are connected to the internal cavity of the inner shell 12 and arranged in a matrix. The wiring holes 122 are threaded holes, and the corners of the box body 1 and the cover body 2 are rounded. The sealing ring 121 is made of elastic material such as rubber to seal the joint between the box body 1 and the cover body 2. Multiple boxes 1 can be used in combination. The outer corners are rounded to reduce bumps and scratches. When the cable is connected to the box body 1, a sealing joint can be added between the wiring hole 122 and the cable.

[0040] To sum up, the principle of this embodiment is that the box body 1 adopts a square outer and round inner structure and is integrally formed by casting. A reinforcing structure is provided between the outer shell 11 and the inner shell 12 of the box body 1 and at the opening to further improve its structural stability and explosion resistance, and is suitable for large-scale production.

[0041] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0042] Although this article uses more boxes 1, outer shell 11, inner shell 12, sealing ring 121, wiring hole 122, reinforcing plate 13, round rib 14, strip rib 15, support plate 16, fixing platform 17, chamfered surface 18, fixing seat 19, cover body 2, cover mouth 3, threaded cover 4, threaded barrel 41, screw cover 42, reinforcing ring 43, reinforcing strip 44, positioning screw hole 45, positioning bolt 46, flip cover 5, plug-in barrel 51, step surface 52, plug-in cover 53, handle groove 54, hinge mounting hole 55, threaded seat 56, connecting screw hole 57, connecting bolt 58, lifting bolt 59, connecting hinge 6, movable sleeve 61, mounting sleeve 611, limiting sleeve 612, movable shaft 62, pin 63, movable part 64, connecting section 641, limiting block 642, rotating head 65, rotating groove 66, rotating hole 67, outer expansion 68, pressing head 69, limiting mechanism 7, limiting notch 71, screw hole 72, limiting screw 73, anti-slip mechanism 8, riveting edge 81, limiting surface 82, deep hole 83, polygonal mounting surface 9 and other terms, but the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional restrictions is contrary to the spirit of the present invention.

Claims

1. A multifunctional high-strength high-explosion-proof grade explosion-proof box, comprising a box body (1) and a cover body (2) closing the box body (1), characterized in that: The box body (1) comprises a rectangular outer shell (11) and a cylindrical inner shell (12) arranged inside the outer shell (11); the outer shell (11) and the inner shell (12) are connected as a whole; the inner shell (12) has a closed bottom and a cylindrical cavity inside; the upper opening of the inner shell (12) is closed by a cover body (2); the upper end of the inner shell (12) is provided with a cover (3) protruding upward relative to the box body (1); the outer side of the cover (3) is polygonal and the inner side is a circular opening flush with the inner wall of the inner shell (12); a cavity is left between the outer side of the inner shell (12) and the vertical corners of the outer shell (11); the The outer shell (11) is square and a reinforcing plate (13) is vertically arranged between the outer shell (11) and the inner shell (12); the central plane of the reinforcing plate (13) is opposite to the central axis of the box (1); the bottom of the inner shell (12) is provided with a circular rib (14) protruding upward and a plurality of pairs of strip ribs (15) symmetrically arranged relative to the center of the circular rib (14); one pair of the strip ribs (15) passes through the circular rib (14); a plurality of fixed platforms (17) connected to the supporting plate (16) are arranged above the strip ribs (15); the outer sides of the vertical corners of the box (1) are provided with chamfered surfaces (18); the lower ends of the chamfered surfaces (18) are provided with fixed seats (19); The box body (1) and the cover body (2) are connected by threads or hinges, and the cover body (2) comprises a threaded cover (4) threadedly connected to the inner side of the upper opening of the inner shell body (12) and a flip cover (5) flip-connected to the upper end of the outer shell body (11); the threaded cover (4) comprises a threaded barrel (41) threadedly connected to the opening of the box body (1), a screw cover (42) is fixed to the upper end of the threaded barrel (41) for closing the upper opening of the inner shell body (12), a conical surface surrounding the screw cover (42) is distributed on the side surface of the screw cover (42), and a reinforcement ring (43) is arranged below the screw cover (42) and a flange (44) is arranged between the reinforcement ring (43) and the screw cover (42). A reinforcing strip (44) is provided between the inner and outer sides; the screw cover (42) and the upper part of the box body (1) are provided with positioning screw holes (45) facing each other; the screw cover (42) is kept fixed in the circumferential rotation angle with the box body (1) by means of positioning bolts (46) connected between the positioning screw holes (45); a sealing ring (121) is provided between the threaded cover (4) or the flip cover (5) and the upper opening of the inner shell body (12); a plurality of wiring holes (122) connected to the internal cavity of the inner shell body (12) and arranged in a matrix are provided on the side of the box body (1); the wiring holes (122) are threaded holes; and the corners of the box body (1) and the cover body (2) are rounded.

2. The multifunctional high-strength and high-explosion-proof grade explosion-proof box according to claim 1 is characterized in that: The flip cover (5) comprises a plug-in tube (51) plugged into the opening of the box body (1); the inner side of the upper end of the inner shell body (12) is provided with a step surface (52) that fits the plug-in tube (51); the upper end of the plug-in tube (51) is fixed with a plug-in cover (53) that closes the upper end opening of the inner shell body (12); the side of the plug-in cover (53) is provided with a conical surface that surrounds the plug-in cover (53) in the circumferential direction; the outer sides of the plug-in cover (53) are provided with handle grooves (54); the plug-in cover A plurality of hinge mounting holes (55) for fixing hinges (6) are provided between one side of the cover (53) and the upper end of the box body (1); a plurality of threaded seats (56) are provided on the plug-in cover (53); a plurality of opposite connecting screw holes (57) are provided between the center of the threaded seat (56) and the upper end of the box body (1); and connecting bolts (58) are provided between the connecting screw holes (57); and a plurality of lifting bolts (59) opposite to the upper end of the box body (1) are threadedly connected on the plug-in cover (53).

3. The multifunctional high-strength high-explosion-proof grade explosion-proof box according to claim 2 is characterized in that: The connecting hinge (6) comprises a movable sleeve (61) fixedly connected to the box body (1); a movable shaft (62) movable up and down relative to the movable sleeve (61) is installed in the movable sleeve (61); the movable shaft (62) is rotatably connected to a movable part (64) via a pin shaft (63); the other end of the movable part (64) is fixedly connected to one side of the cover body (2); a limiting mechanism (7) for limiting the circumferential rotation angle of the movable part (64) and the cover body (2) is arranged between the movable part (64) and the cover body (2); an anti-slip mechanism (8) for preventing the movable shaft (62) from falling out of the movable sleeve (61) is arranged between the movable shaft (62) and the movable sleeve (61); and polygonal mounting surfaces (9) are arranged on the sides of the movable sleeve (61) and the movable part (64).

4. The multifunctional high-strength high-explosion-proof grade explosion-proof box according to claim 3 is characterized in that: The movable sleeve (61) comprises a mounting sleeve (611) threadedly connected to a hinge mounting hole (55) above the box body (1); a limiting sleeve (612) is fixed to the upper end of the mounting sleeve (611) and is in contact with the upper part of the box body (1); the anti-slip mechanism (8) comprises a riveting edge (81) arranged at the lower end of the movable shaft (62); the riveting edge (81) is opposite to the limiting surface (82) below the movable sleeve (61); and a deep hole (83) is reserved in the hinge mounting hole (55) for the movable shaft (62) to move up and down.

5. The multifunctional high-strength high-explosion-proof grade explosion-proof box according to claim 3 is characterized in that: The movable part (64) comprises a connecting section (641) threadedly connected to the cover body (2) and a limiting block (642) abutting against the bottom of the cover body (2); the limiting mechanism (7) comprises a limiting notch (71) arranged on the side of the limiting block (642); a screw hole (72) opposite to the limiting notch (71) is opened at the bottom of the cover body (2); a limiting screw (73) is threadedly connected to the inner thread of the screw hole (72) and is engaged with the limiting notch (71).

6. The multifunctional high-strength high-explosion-proof grade explosion-proof box according to claim 3 is characterized in that: The movable part (64) is provided with a rotating head (65) at the end thereof. The rotating head (65) is clamped in a rotating groove (66) at the end of the movable shaft (62). A rotating hole (67) for inserting a pin shaft (63) is provided at the center of the rotating head (65) and the end of the movable shaft (62). The ends of the movable part (64) and the movable shaft (62) are round heads. The rotating angle range of the movable part (64) and the movable shaft (62) is not less than 180°. An outer flared opening (68) is provided on the outer side of the rotating hole of the movable shaft (62). Both ends of the pin shaft (63) are provided with pressing heads (69) which are pressed and matched with the outer flared opening (68). The diameter of the rotating head (65) of the movable part (64) is equal to the diameter of the movable shaft (62).

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