Explosion-proof junction box

Abstract

The utility model belongs to the technical field of junction boxes, and particularly relates to an explosion-proof junction box, which comprises a box body, which is internally provided with a wiring terminal and is provided with a wire inlet nut on the side surface; the box cover is arranged on the box body and is used for blocking the box body; the moisture-proof structure is arranged in the box body and is used for absorbing entering water vapor; wherein a sealing structure is further arranged between the box body and the box cover and used for improving the sealing effect between the box body and the box cover. The beneficial effects of the utility model are that the built-in moisture-proof structure can effectively absorb moisture entering the box body, prevents the moisture from condensing on the wiring terminal or other electrical elements, reduces the problems of short circuit, corrosion and the like caused by moisture, and guarantees the long-term stability and reliability of electrical connection.

Description

Technical Field

[0001] The present application belongs to the technical field of junction boxes, and in particular, relates to an explosion-proof junction box. Background Art

[0002] The cable box can be used in conjunction with the cables used in coal mine communications and monitoring systems. It can be used in underground mining, in tunnels and caverns, and in dangerous environments with coal dust explosions.

[0003] The patent with announcement number CN220382700U discloses an explosion-proof junction box, which relates to the field of junction boxes, including an explosion-proof junction box body, a moisture-proof shell installed on the surface of the mounting wall panel, and two groups of waterproof components are arranged on the surface of the moisture-proof shell, two groups of limit mechanisms are arranged on the surface of the waterproof component, and a reset mechanism is arranged on the surface of the waterproof component.

[0004] The above patent prevents moisture from entering the box body by providing a moisture-proof shell and a moisture-proof heat dissipation mechanism, and uses a fan to assist in heat dissipation. Although it seems that the moisture-proof and heat-dissipating effect can be achieved, it is not realistic to install a fan in the junction box. The need for both heat dissipation and sealing to prevent moisture from entering will make the overall structure complicated and easy to be damaged during use, resulting in loss of heat dissipation effect and ultimately loss of moisture-proof effect. Improvement is needed. Utility Model Content

[0005] The purpose of this application is to provide an explosion-proof junction box that can solve the above problems.

[0006] The purpose of this application is to provide an explosion-proof junction box: including:

[0007] The box body has wiring terminals arranged inside and wire nuts arranged on the side;

[0008] A box cover, disposed on the box body and used to seal the box body;

[0009] A moisture-proof structure is provided inside the box body to absorb the incoming moisture;

[0010] Wherein, a sealing structure is further provided between the box body and the box cover to improve the sealing effect between the box body and the box cover.

[0011] The above-mentioned explosion-proof junction box is adopted, through the overall explosion-proof design, including the box body and the box cover structure, and the high sealing design between them, it effectively prevents external explosive mixtures or sparks from entering the interior of the junction box, thereby protecting the internal circuit and wiring from the influence of the external dangerous environment, greatly improving the safety of equipment and operation. At the same time, the built-in moisture-proof structure can effectively absorb the moisture entering the box body, prevent the moisture from condensing on the terminal blocks or other electrical components, reduce the problems of short circuit and corrosion caused by moisture, and ensure the long-term stability and reliability of the electrical connection. In addition, the sealing structure design is set between the box body and the box cover, which improves the sealing effect of the junction box, not only prevents the invasion of external gas, liquid and solid particles, but also reduces the pressure changes inside the box body caused by temperature changes, further enhancing the explosion-proof effect.

[0012] Furthermore, the sealing structure comprises:

[0013] An annular protrusion is provided at the bottom of the box cover;

[0014] An annular step, arranged on the box body and connected to the annular protrusion;

[0015] A first sealing ring is arranged on the annular protrusion, and a first annular groove matching the first sealing ring is arranged on the outer wall of the annular protrusion;

[0016] When the box body and the box cover are closed, the first sealing ring contacts the annular step.

[0017] By providing an annular protrusion at the bottom of the box body and an annular step on the box body, the annular protrusion can be tightly fitted on the annular groove of the box body when the box cover is closed, forming a barrier to prevent the entry of external substances (such as gas, liquid, dust, etc.). The first sealing ring is provided on the annular protrusion and embedded in the first annular groove on the outer wall of the annular protrusion. The first sealing ring is usually made of elastic material, such as rubber or silicone, and has good sealing and corrosion resistance. When the box cover and the box body are closed, the first sealing ring is compressed between the annular protrusion and the annular step, and also forms a barrier to effectively prevent the penetration of gas, liquid and solid particles. Through the coordinated use of the annular protrusion, the annular step and the first sealing ring, a highly sealed environment can be formed, thereby effectively improving the sealing performance of the explosion-proof junction box, extending the service life of the internal electrical components, and preventing electrical failures caused by moisture, corrosion and the like.

[0018] Furthermore: a second annular groove is provided at the bottom of the box cover, and a second sealing ring is provided in the second annular groove.

[0019] In the present application, a second annular groove is provided at the bottom of the box body, and a second sealing ring is arranged in the second annular groove, which forms a multi-level sealing structure with the first sealing ring to provide an additional sealing effect. The second sealing ring is made of elastic material, such as rubber or silicone, like the first sealing ring, and has good sealing and corrosion resistance. When the box cover and the box body are closed, the second sealing ring will be compressed and tightly attached to the box body to form a seal, effectively preventing the penetration of external gas, liquid and solid particles, and can also resist sealing failure caused by temperature changes or vibrations to a certain extent, ensuring the long-term stability and safety of the internal environment of the junction box.

[0020] Furthermore, the moisture-proof structure comprises:

[0021] A moisture-proof box, wherein a desiccant is arranged inside;

[0022] A mounting frame is arranged in the box body, and the moisture-proof box is installed on the mounting frame;

[0023] A fastener, disposed on the mounting frame and used to mount the moisture-proof box on the mounting frame;

[0024] One side of the moisture-proof box is arc-shaped and fits with the inner wall of the box body.

[0025] By setting a moisture-proof box in the box body, the interior of which is filled with desiccant, the desiccant can absorb and store the moisture entering the moisture-proof box, thereby keeping the moisture-proof box and its surrounding environment dry, and the moisture-proof box needs to be replaced regularly to avoid losing the moisture-proof effect. The mounting frame is set in the box body to support and fix the moisture-proof box. It is made of corrosion-resistant materials to ensure that the stability and durability of the structure can be maintained in a humid environment. Fasteners are set on the mounting frame to firmly mount the moisture-proof box on the mounting frame, thereby avoiding displacement or falling off of the moisture-proof box due to vibration or impact. In addition, one side of the moisture-proof box is curved and fits tightly with the inner wall of the box body, making the installation of the moisture-proof box tighter and reducing the occupied space.

[0026] Furthermore, the mounting frame includes a plate body and an extension piece arranged on the plate body, and a connecting hole penetrating the plate body is arranged in the extension piece;

[0027] The mounting frame is provided with a mounting plate corresponding to the extension piece, and the mounting plate is provided with a through hole corresponding to the connecting hole;

[0028] The fastener comprises a bolt and a nut, and the bolt passes through the through hole and the connecting hole in sequence and then is connected with the nut;

[0029] Wherein, a gasket is also arranged between the bolt and the mounting plate.

[0030] The mounting frame includes a plate body and an extension piece. The plate body is mounted on the inner wall of the box body. The plate body is used to provide support to facilitate the installation of the moisture-proof box. The extension piece is arranged on the plate body and is cylindrical. A connecting hole penetrating the plate body is arranged inside the plate body for cooperating with the fastener. The mounting plate is arranged on the moisture-proof box and is fixed with the plate body by cooperating with the plate body and the fastener. The fastener includes a bolt and a nut. The bolt passes through the through hole on the mounting plate and the connecting hole in the extension piece and is screwed with the nut to fix the moisture-proof box in the box body. At the same time, by arranging a gasket between the bolt and the mounting plate, the contact area between the bolt and the mounting plate can be increased, the fastening force can be dispersed, the local compressive stress can be reduced, and the mounting plate can be prevented from being directly worn when the bolt is loose, thereby protecting its surface from damage.

[0031] Furthermore, a limiting ring is arranged in the connecting hole, a compression ring is arranged on the bolt, a spring is arranged between the compression ring and the limiting ring, and after the fastener and the nut are screwed together, the compression ring and the limiting ring squeeze the spring.

[0032] The limit ring is arranged in the connection hole and has an annular structure. Its inner diameter is larger than the diameter of the bolt. The pressure ring is arranged on the bolt. The outer diameter of the pressure ring is smaller than the inner diameter of the connection hole. Therefore, when the bolt passes through the connection hole, the pressure ring will be blocked by the limit ring and cannot move forward. The spring is arranged between the pressure ring and the limit ring. Its function is to provide a certain elastic force so that the bolt can maintain a certain preload when subjected to external force. When the fastener (bolt and nut) is tightened, the pressure ring and the limit ring will squeeze the spring, causing the spring to deform and store energy. This elastic force helps to offset the loosening trend caused by vibration, temperature change and other factors, and maintain the stability of the fastener. During the tightening process, as the nut rotates, the bolt is gradually tightened. At the same time, the pressure ring and the limit ring squeeze the spring, causing the spring to deform. When the required tightening force is reached, the nut stops rotating. At this time, the elastic force of the spring will act on the bolt to maintain a certain preload, prevent the bolt from loosening, and improve the installation stability of the moisture-proof box.

[0033] The beneficial effects of this application are:

[0034] 1. The built-in moisture-proof structure can effectively absorb moisture entering the box, prevent moisture from condensing on the wiring terminals or other electrical components, reduce problems such as short circuits and corrosion caused by moisture, and ensure the long-term stability and reliability of electrical connections;

[0035] 2. By setting a sealing structure design between the box body and the box cover, the sealing effect of the junction box is improved, which not only prevents the invasion of external gas, liquid and solid particles, but also reduces the pressure change inside the box body caused by temperature change, further enhancing the explosion-proof effect;

[0036] 3. By setting a limit ring, a pressure ring and a spring, during the tightening process, as the nut rotates, the bolt is gradually tightened. At the same time, the pressure ring and the limit ring squeeze the spring, causing the spring to deform. When the required tightening force is reached, the nut stops rotating. At this time, the elastic force of the spring will act on the bolt to maintain a certain pre-tightening force, prevent the bolt from loosening, and improve the installation stability of the moisture-proof box. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a structural schematic diagram of the utility model;

[0038] Figure 2 It is a schematic diagram of the structure of the utility model in the open state;

[0039] Figure 3 It is a structural schematic diagram of the utility model in another perspective of the opened state;

[0040] Figure 4 yes Figure 2 Schematic diagram of the enlarged structure at A in the middle;

[0041] Figure 5 It is a schematic diagram of the structure of the fastener matching of the utility model.

[0042] The reference numerals in the figure are: 100, box body; 110, terminal block; 120, wire inlet nut; 200, box cover; 300, moisture-proof structure; 310, moisture-proof box; 320, mounting frame; 321, plate body; 322, extension piece; 333, connecting hole; 334, mounting plate; 335, through hole; 330, fastener; 331, bolt; 332, nut; 340, gasket; 350, limit ring; 360, pressure ring; 370, spring; 400, sealing structure; 410, annular protrusion; 420, annular step; 430, first sealing ring; 440, first annular groove; 450, second annular groove; 460, second sealing ring. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0044] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0045] The explosion-proof junction box provided in the embodiment of the present application is described in detail below through specific embodiments and application scenarios in conjunction with the accompanying drawings.

[0046] Embodiment 1:

[0047] like Figures 1 to 3 As shown, the embodiment of the present application provides an explosion-proof junction box: comprising:

[0048] The box body 100 has a wiring terminal 110 disposed inside and a wire inlet nut 120 disposed on the side thereof;

[0049] The box cover 200 is disposed on the box body 100 and is used to seal the box body 100;

[0050] The moisture-proof structure 300 is disposed in the box body 100 and is used to absorb the moisture that enters;

[0051] A sealing structure 400 is further provided between the box body 100 and the box cover 200 to improve the sealing effect between the box body 100 and the box cover 200.

[0052] In some implementations of the embodiments of the present application, Figure 1 As shown, the above-mentioned explosion-proof junction box is adopted, through the overall explosion-proof design, including the box body 100 and the box cover 200 structure, and the high sealing design between them, effectively preventing the external explosive mixture or spark from entering the interior of the junction box, thereby protecting the internal circuit and wiring from the external dangerous environment, greatly improving the safety of the equipment and operation. At the same time, the built-in moisture-proof structure 300 can effectively absorb the moisture entering the box body 100, prevent the moisture from condensing on the terminal 110 or other electrical components, reduce the problems of short circuit and corrosion caused by moisture, and ensure the long-term stability and reliability of the electrical connection. In addition, the sealing structure 400 design is set between the box body 100 and the box cover 200, which improves the sealing effect of the junction box, not only prevents the invasion of external gas, liquid and solid particles, but also reduces the pressure change inside the box body 100 caused by temperature change, further enhancing the explosion-proof effect.

[0053] Embodiment 2:

[0054] An embodiment of the present application provides an explosion-proof junction box. In addition to the above-mentioned technical features, the explosion-proof junction box of the embodiment of the present application also includes the following technical features.

[0055] like Figure 2 and Figure 3 As shown, the sealing structure 400 includes:

[0056] An annular protrusion 410 is provided at the bottom of the box cover 200;

[0057] An annular step 420 is disposed on the box body 100 and is connected to the annular protrusion 410;

[0058] A first sealing ring 430 is disposed on the annular protrusion 410 , and a first annular groove 440 adapted to the first sealing ring 430 is disposed on the outer wall of the annular protrusion 410 ;

[0059] When the box body 100 and the box cover 200 are closed, the first sealing ring 430 contacts the annular step 420 .

[0060] In the embodiment of the present application, by providing an annular protrusion 410 at the bottom of the box body 100 and providing an annular step 420 on the box body 100, the annular protrusion 410 can be closely fitted on the annular groove of the box body 100 when the box cover 200 is closed, forming a barrier to prevent the entry of external substances (such as gas, liquid, dust, etc.). The first sealing ring 430 is provided on the annular protrusion 410 and embedded in the first annular groove 440 on the outer wall of the annular protrusion 410. The first sealing ring 430 is usually made of an elastic material, such as rubber or silicone, and has good sealing and corrosion resistance. When the box cover 200 and the box body 100 are closed, the first sealing ring 430 is compressed between the annular protrusion 410 and the annular step 420, and also forms a barrier to effectively prevent the penetration of gas, liquid and solid particles. By using the annular protrusion 410, the annular step 420 and the first sealing ring 430 in cooperation, a highly sealed environment can be formed, thereby effectively improving the sealing performance of the explosion-proof junction box, extending the service life of internal electrical components, and preventing electrical failures caused by moisture, corrosion and the like.

[0061] Moreover, a second annular groove 450 is disposed at the bottom of the box cover 200 , and a second sealing ring 460 is disposed in the second annular groove 450 .

[0062] In some embodiments of the present application, a second annular groove 450 is provided at the bottom of the box body 100, and a second sealing ring 460 is arranged in the second annular groove 450, which forms a multi-level sealing structure 400 with the first sealing ring 430 to provide an additional sealing effect. The second sealing ring 460, like the first sealing ring 430, is made of an elastic material, such as rubber or silicone, and has good sealing and corrosion resistance. When the box cover 200 and the box body 100 are closed, the second sealing ring 460 will be compressed and tightly attached to the box body 100 to form a seal, effectively preventing the penetration of external gas, liquid and solid particles, and can also resist sealing failure caused by temperature changes or vibrations to a certain extent, ensuring the long-term stability and safety of the internal environment of the junction box.

[0063] Embodiment 3:

[0064] An embodiment of the present application provides an explosion-proof junction box. In addition to the above-mentioned technical features, the explosion-proof junction box of the embodiment of the present application also includes the following technical features.

[0065] like Figures 2 to 4 As shown, the moisture-proof structure 300 includes:

[0066] A moisture-proof box 310, wherein a desiccant is arranged inside;

[0067] A mounting frame 320 is disposed in the box body 100, and the moisture-proof box 310 is mounted on the mounting frame 320;

[0068] A fastener 330 , which is disposed on the mounting frame 320 and is used to mount the moisture-proof box 310 on the mounting frame 320 ;

[0069] One side of the moisture-proof box 310 is arc-shaped and fits with the inner wall of the box body 100 .

[0070] In the embodiment of the present application, by arranging the moisture-proof box 310 in the box body 100, the interior of the moisture-proof box 310 is filled with a desiccant, which can absorb and store the moisture entering the moisture-proof box 310, thereby keeping the moisture-proof box 310 and its surrounding environment dry, and the moisture-proof box 310 needs to be replaced regularly to avoid losing the moisture-proof effect. The mounting frame 320 is arranged in the box body 100, for supporting and fixing the moisture-proof box 310, which is made of corrosion-resistant materials to ensure that the stability and durability of the structure can be maintained in a humid environment. The fastener 330 is arranged on the mounting frame 320, for firmly mounting the moisture-proof box 310 on the mounting frame 320, thereby avoiding the displacement or falling off of the moisture-proof box 310 due to vibration or impact. In addition, one side of the moisture-proof box 310 is curved and fits closely with the inner wall of the box body 100, so that the installation of the moisture-proof box 310 is tighter and reduces the occupied space.

[0071] Embodiment 4:

[0072] An embodiment of the present application provides an explosion-proof junction box. In addition to the above-mentioned technical features, the explosion-proof junction box of the embodiment of the present application also includes the following technical features.

[0073] like Figures 2 to 5 As shown, the mounting frame 320 includes a plate body 321 and an extension piece 322 disposed on the plate body 321, and a connecting hole 333 penetrating the plate body 321 is disposed in the extension piece 322;

[0074] The mounting frame 320 is provided with a mounting plate 334 corresponding to the extension piece 322 , and the mounting plate 334 is provided with a through hole 335 corresponding to the connecting hole 333 ;

[0075] The fastener 330 includes a bolt 331 and a nut 332. The bolt 331 passes through the through hole 335 and the connecting hole 333 in sequence and is connected to the nut 332.

[0076] A gasket 340 is further disposed between the bolt 331 and the mounting plate 334 .

[0077] In the embodiment of the present application, the mounting frame 320 includes a plate body 321 and an extension piece 322. The plate body 321 is mounted on the inner wall of the box body 100. The plate body 321 is used to provide support to facilitate the installation of the moisture-proof box 310. The extension piece 322 is arranged on the plate body 321 and is cylindrical. A connection hole 333 penetrating the plate body 321 is arranged inside the extension piece 322 for cooperating with the fastener 330. The mounting plate 334 is arranged on the moisture-proof box 310, and the moisture-proof box 310 is fixed by cooperating with the plate body 321 and moving the fastener 330. The fastener 330 includes a bolt 331 and a nut 332. The bolt 331 passes through the through hole 335 on the mounting plate 334 and the connection hole 333 in the extension piece 322, and is screwed with the nut 332 to fix the moisture-proof box 310 in the box body 100. At the same time, by setting a gasket 340 between the bolt 331 and the mounting plate 334, the contact area between the bolt 331 and the mounting plate 334 can be increased, the tightening force can be dispersed, the local compressive stress can be reduced, and the bolt 331 can be prevented from directly wearing the mounting plate 334 when loosened, thereby protecting its surface from damage.

[0078] Furthermore, a limiting ring 350 is provided in the connecting hole 333 , a pressing ring 360 is provided on the bolt 331 , a spring 370 is provided between the pressing ring 360 and the limiting ring 350 , and after the fastener 330 and the nut 332 are screwed together, the pressing ring 360 and the limiting ring 350 squeeze the spring 370 .

[0079] In some embodiments of the present application, the limiting ring 350 is arranged in the connecting hole 333 and is an annular structure, and its inner diameter is larger than the diameter of the bolt 331. The pressing ring 360 is arranged on the bolt 331, and the outer diameter of the pressing ring 360 is smaller than the inner diameter of the connecting hole 333. Therefore, when the bolt 331 passes through the connecting hole 333, the pressing ring 360 will be blocked by the limiting ring 350 and cannot move forward. The spring 370 is arranged between the pressing ring 360 and the limiting ring 350, and its function is to provide a certain elastic force so that the bolt 331 can maintain a certain pre-tightening force when subjected to external force. When the fastener 330 (bolt 331 and nut 332) is tightened, the pressing ring 360 and the limiting ring 350 will squeeze the spring 370, causing the spring 370 to deform and store energy. This elastic force helps to offset the loosening tendency caused by factors such as vibration and temperature changes, and maintain the stability of the fastener 330. During the tightening process, as the nut 332 rotates, the bolt 331 is gradually tightened. At the same time, the pressure ring 360 and the limit ring 350 squeeze the spring 370, causing the spring 370 to deform. When the required tightening force is reached, the nut 332 stops rotating. At this time, the elastic force of the spring 370 will act on the bolt 331, maintaining a certain pre-tightening force to prevent the bolt 331 from loosening, thereby improving the installation stability of the moisture-proof box 310.

[0080] It should be noted that, in this article, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise one..." do not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0081] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. An explosion-proof junction box, characterized in that: include: A box body (100) is provided with a wiring terminal (110) inside and a wire inlet nut (120) on the side thereof; A box cover (200), disposed on the box body (100) and used to seal the box body (100); A moisture-proof structure (300) is disposed in the box body (100) and is used to absorb incoming moisture; Wherein, a sealing structure (400) is further provided between the box body (100) and the box cover (200) to improve the sealing effect between the box body (100) and the box cover (200).

2. The explosion-proof junction box according to claim 1, characterized in that: The sealing structure (400) comprises: An annular protrusion (410) is provided at the bottom of the box cover (200); An annular step (420) is disposed on the box body (100) and is aligned with the annular protrusion (410); A first sealing ring (430) is arranged on the annular protrusion (410), and a first annular groove (440) adapted to the first sealing ring (430) is arranged on the outer wall of the annular protrusion (410); When the box body (100) and the box cover (200) are closed, the first sealing ring (430) contacts the annular step (420).

3. An explosion-proof junction box according to claim 2, characterized in that: The bottom of the box cover (200) is also provided with a second annular groove (450), and a second sealing ring (460) is provided in the second annular groove (450).

4. The explosion-proof junction box according to claim 1, characterized in that: The moisture-proof structure (300) comprises: A moisture-proof box (310) having a desiccant disposed therein; A mounting frame (320) is disposed in the box body (100), and the moisture-proof box (310) is mounted on the mounting frame (320); A fastener (330) is disposed on the mounting frame (320) and is used to mount the moisture-proof box (310) on the mounting frame (320); One side of the moisture-proof box (310) is arc-shaped and fits closely to the inner wall of the box body (100).

5. The explosion-proof junction box according to claim 4, characterized in that: The mounting frame (320) comprises a plate body (321) and an extension piece (322) arranged on the plate body (321), wherein a connection hole (333) penetrating the plate body (321) is arranged in the extension piece (322); The mounting frame (320) is provided with a mounting plate (334) corresponding to the extension piece (322), and the mounting plate (334) is provided with a through hole (335) corresponding to the connection hole (333); The fastener (330) comprises a bolt (331) and a nut (332), wherein the bolt (331) passes through the through hole (335) and the connecting hole (333) in sequence and is connected to the nut (332); A gasket (340) is also provided between the bolt (331) and the mounting plate (334).

6. The explosion-proof junction box according to claim 5, characterized in that: A limiting ring (350) is arranged in the connecting hole (333), a pressing ring (360) is arranged on the bolt (331), a spring (370) is arranged between the pressing ring (360) and the limiting ring (350), and after the fastener (330) and the nut (332) are screwed together, the pressing ring (360) and the limiting ring (350) squeeze the spring (370).

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