A high protection explosion-proof terminal box device

Abstract

The utility model provides a kind of high protection explosion-proof terminal box ware, relate to explosion-proof terminal box technical field, including terminal box seat and terminal box cover are fastened connection by bolt assembly, terminal box bucket is fixed in terminal box seat one side, its side close to terminal box seat is equipped with sealing ring, the contact end of terminal box seat and terminal box cover is all set up sealing ring groove, double-layer elastic sealing ring is embedded in groove and sticks to both sides groove wall;The utility model is through being provided with above-mentioned structure, terminal box one end is formed dynamic sealing with terminal box seat inboard wall by sealing ring, when the other end is locked by bolt assembly, double-layer sealing ring is deformed under pressure, forms sealing barrier, effectively blocks gas, liquid and dust into box;While terminal box seat bottom is fixed mounting plate by mounting hole, mounting plate cooperates with fixed assembly, and terminal box is fastened as a whole in equipment or wall body, by adjusting the pre-tightening force of fixed assembly, compensating installation error, ensure that box body remains stable under vibration or impact environment, avoid sealing failure.

Description

Technical Field

[0001] This utility model relates to the technical field of explosion-proof junction box equipment, and more specifically, to a high-protection explosion-proof junction box device. Background Technology

[0002] An explosion-proof junction box is a special type of electrical equipment, mainly used for connecting and protecting electrical equipment, various cables, electrical instruments, and low-voltage electrical appliances in environments with the risk of gas and vapor explosions. The main function of an explosion-proof junction box is to protect cables from being crushed. It can operate in explosive gas environments, and even if there are circuit sparks or flammable gases inside the box, only a small-scale deflagration will occur under the action of the spark, thus preventing sparks caused by short circuits inside the junction box from affecting hazardous areas on site.

[0003] Traditional explosion-proof junction boxes have the following drawbacks: First, the junction between the cover and the shell relies on a single-layer planar seal, which is insufficient. After long-term use, the sealing material ages or deforms under pressure, allowing dust and moisture to intrude. Second, the structural design of traditional explosion-proof junction boxes is unreasonable, and the connection parts are prone to loosening, leading to malfunctions. Third, the installation and maintenance of traditional explosion-proof junction boxes are not convenient, resulting in low on-site construction efficiency and increased operation and maintenance costs. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a high-protection explosion-proof junction box. This high-protection explosion-proof junction box not only has good dustproof properties, but also prevents loosening of connections, while reducing maintenance costs.

[0005] To achieve the above objectives, this utility model adopts the following technical solution:

[0006] A high-protection explosion-proof junction box includes a junction box base and a junction box cover. A junction box hopper is fixedly connected to one side of the junction box base. The end of the junction box cover away from the junction box hopper is fixed to the junction box base by a bolt assembly. A sealing ring is provided on the side of the junction box hopper near the junction box base, and the sealing ring fits against the inner wall of the junction box base. An installation hole is provided at the bottom of the junction box base, and an installation plate and a fixing assembly are fixed in the installation hole. Sealing ring grooves are provided at both ends of the junction box base and the junction box cover where they contact each other, and the openings of the two sealing ring grooves of the junction box base correspond to the openings of the two sealing ring grooves of the junction box cover. A double-layer elastic sealing ring is provided inside the sealing ring groove of each junction box base and the corresponding sealing ring groove of the junction box cover. The double-layer elastic sealing ring is adhered to the sealing ring grooves on both sides and tightly fitted to the sealing ring grooves.

[0007] Furthermore, the sealing ring groove at the end away from the junction box is located on the side of the bolt assembly near the junction box.

[0008] Furthermore, the double-layer elastic sealing ring includes a circular fixing block, an O-ring, and a first elastic washer. The O-ring is fixed on the arc-shaped sidewall of the circular fixing block, and there are two elastic washers, which are respectively fixedly connected to the two planar sidewalls of the circular fixing block.

[0009] The O-ring is tightly attached to the bottom of the sealing groove of the junction box base and the junction box cover, and the two elastic washers are tightly attached to the sidewalls of the sealing groove of the junction box base and the junction box cover.

[0010] Furthermore, the circular fixing block includes an integrally formed fixing block body and two sealing ring retaining blocks respectively disposed at both ends of the outer ring of the fixing block body, the two sealing ring retaining blocks being used to retain the O-ring seal.

[0011] Furthermore, each of the two sealing ring blocks has a mounting ring groove on the side near the O-ring, and a second elastic washer is matched and connected in the mounting ring groove, with the two second elastic washers tightly attached to the O-ring.

[0012] Furthermore, the bolt assembly includes a bolt head, a bolt shank, a fixing washer, and a wire thread sleeve. The bolt shank is threadedly connected to the junction box cover. The fixing washer is fitted onto the outside of the bolt shank and is located between the junction box cover and the bolt head. The wire thread sleeve is fitted onto the outside of the bolt shank at the end away from the bolt head and is engaged with the junction box cover.

[0013] Furthermore, the fixing washer includes a first double-sided toothed washer and a second double-sided toothed washer. The first double-sided toothed washer and the second double-sided toothed washer are provided with a first locking tooth on their sides that are close to each other, and a second locking tooth on their sides that are far from each other. The tooth pitch of the first locking tooth is wider than the tooth pitch of the second locking tooth, and the tooth surfaces of the first locking tooth and the second locking tooth face opposite directions.

[0014] Furthermore, the bolt assembly is provided with a protective ring at the top, which protrudes from the head of the bolt body.

[0015] Furthermore, the sealing ring groove has a depth of 2-4 mm and a width of 4-6 mm.

[0016] Furthermore, the O-ring, the first elastic washer, and the second elastic washer are all one of nitrile rubber, fluororubber, or silicone rubber.

[0017] Furthermore, the O-ring, the first elastic washer, and the second elastic washer are all nitrile rubber sealing rings.

[0018] Furthermore, metal gaskets are fixedly connected to both sides of the sealing ring.

[0019] Furthermore, the mounting plate is fitted into the upper and lower ends of the mounting hole.

[0020] Furthermore, the fixing component includes a mounting bolt, and a threaded sleeve is provided between the mounting bolt and the mounting plate.

[0021] Furthermore, the fixing assembly also includes a stop washer and a locking washer disposed between the mounting plate and the bottom of the mounting hole.

[0022] Furthermore, a pressure plate is provided on the outer wall of the junction box.

[0023] Compared with the prior art, the beneficial effects of this utility model's technical solution are:

[0024] This utility model provides a high-protection explosion-proof junction box. By designing a sealing ring groove at the contact point between the box body and the box cover, and setting a double-layer elastic sealing ring in the sealing ring groove, combined with the sealing ring design between the junction box hopper and the junction box base, a multi-layer sealing system is formed, which effectively prevents dust, water vapor, flammable gases and other substances from entering the box body, and significantly improves the explosion-proof performance of the product.

[0025] This utility model features a high-protection explosion-proof junction box. The junction box cover is securely connected to the junction box base via a bolt assembly, ensuring a stable connection even under complex environments such as vibration and impact. At the same time, the sealing ring groove design at the contact area between the box body and the cover enhances the tightness of the contact surface, preventing sealing failure or poor wiring contact due to loosening.

[0026] This utility model features a high-protection explosion-proof junction box. The installation plate and fixing components at the bottom of the junction box make the installation process more convenient, allowing it to be quickly fixed to various mounting surfaces or brackets. At the same time, the sealing ring adopts an adhesive design, which facilitates replacement and maintenance, reducing the later operation and maintenance costs. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0028] Figure 2 This is a schematic diagram of the structure of the double-layer elastic sealing ring described in this utility model;

[0029] Figure 3 This is a schematic diagram of the structure of the fixing washer described in this utility model.

[0030] The components include: 1. Junction box base; 2. Junction box cover; 3. Junction box compartment; 301. Pressure plate; 4. Bolt assembly; 401. Bolt head; 402. Bolt shank; 403. Fixing washer; 4031. First double-sided toothed washer; 4032. Second double-sided toothed washer; 40311. First locking tooth; 40312. Second locking tooth; 404. Protective ring; 5. Sealing ring; 6. Mounting plate; 7. Fixing assembly; 701. Mounting bolt; 702. Threaded sleeve; 703. Stop washer; 704. Locking washer; 8. Double-layer elastic sealing ring; 801. Circular fixing block; 8011. One-piece molded fixing block body; 8012. Sealing ring retainer; 802. O-ring; 803. First elastic washer; 804. Second elastic washer; 9. Metal gasket. Detailed Implementation

[0031] The present invention will be further described below with reference to specific embodiments. The accompanying drawings are for illustrative purposes only, representing schematic diagrams rather than actual physical objects, and should not be construed as limiting the present invention. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0032] Example 1

[0033] like Figure 1-3 As shown, this utility model provides a high-protection explosion-proof junction box device, including a junction box base 1 and a junction box cover 2. A junction box hopper 3 is fixedly connected to one side of the junction box base 1, and the end of the junction box cover 2 away from the junction box hopper 3 is fixed to the junction box base 1 by a bolt assembly 4.

[0034] The junction box hopper 3 is provided with a sealing ring 5 on the side near the junction box base 1, and the sealing ring 5 fits against the inner wall of the junction box base 1.

[0035] The junction box base 1 has a mounting hole at its bottom, and a mounting plate 6 and a fixing component 7 are fixed in the mounting hole.

[0036] Both ends of the junction box base 1 and the junction box cover 2 that come into contact with each other are provided with sealing ring grooves, and the openings of the two sealing ring grooves of the junction box base 1 correspond to the openings of the two sealing ring grooves of the junction box cover 2 respectively. Each sealing ring groove of the junction box base 1 and the corresponding sealing ring groove of the junction box cover 2 are provided with a double-layer elastic sealing ring 8. The double-layer elastic sealing ring 8 is pasted on the sealing ring grooves on both sides and is tightly attached to the sealing ring grooves.

[0037] The high-protection explosion-proof junction box of this utility model has a junction box base 1 and a junction box cover 2 fastened together by a bolt assembly 4 to form a closed cavity. It can also be quickly disassembled and assembled, which is convenient for local maintenance and reduces maintenance costs. The junction box hopper 3 is fixed to one side of the junction box base 1 for introducing external cables. A sealing ring 5 is provided on the side of the junction box hopper 3 closest to the junction box base 1. The sealing ring 5 of the junction box hopper 3 forms a dynamic seal with the inner wall of the junction box base 1, adapting to slight cable misalignment or vibration and preventing external media from intruding along the cable surface. Sealing ring grooves are provided at the contact ends of the junction box base 1 and the junction box cover 2. The double-layer elastic sealing ring 8 is made of highly elastic material, resistant to aging and corrosion. The double-layer elastic sealing ring 8 is embedded in the groove and tightly adheres to the side groove walls, avoiding sealing failure caused by assembly deviations and extending service life. When the bolt assembly 4 is tightened, the double-layer sealing ring is deformed under pressure, forming a sealing barrier that effectively prevents gas, liquid, and dust from entering the box. A mounting plate 6 is fixed to the bottom of the junction box base 1 through mounting holes. The mounting plate 6 cooperates with the fixing assembly 7 to secure the entire junction box to the equipment or wall. By adjusting the preload of the fixing assembly 7, installation errors are compensated, ensuring the box remains stable under vibration or impact environments, preventing sealing failure, and adapting to different mounting surfaces, thus improving equipment applicability. This utility model's high-protection explosion-proof junction box significantly improves explosion-proof performance and sealing capabilities, enhancing the safety and reliability of equipment in flammable, explosive, high-dust, or humid environments, while reducing installation and maintenance difficulty.

[0038] Furthermore, in another embodiment, the double-layer elastic sealing ring 8 includes a circular fixing block 801, an O-ring 802, and a first elastic washer 803. The O-ring 802 is fixed on the arc-shaped sidewall of the circular fixing block 801, and there are two elastic washers 803, which are respectively fixedly connected to the two planar sidewalls of the circular fixing block 801.

[0039] The O-ring 802 is tightly attached to the bottom of the sealing groove of the junction box seat 1 and the junction box cover 2, and the two elastic washers 803 are tightly attached to the sidewall of the sealing groove of the junction box seat 1 and the junction box cover 2.

[0040] The circular fixing block 801 is a solid structure. The O-ring 802 is fixed to the arc-shaped side wall of the circular fixing block 801 and closely adheres to the bottom of the sealing ring groove to form the first static seal. The first elastic washer 803 is fixedly connected to the two planar side walls of the circular fixing block 801 and closely adheres to the side wall of the sealing ring groove to form the second radial seal, which can prevent dust and water from entering the explosion-proof box and has good sealing performance.

[0041] Furthermore, in another embodiment, the circular fixing block 801 includes an integrally formed fixing block body 8011 and two sealing ring retaining blocks 8012 respectively disposed at both ends of the outer ring of the fixing block body 8011. The two sealing ring retaining blocks 8012 are used to retain the O-ring seal 802, which can better fix the O-ring seal 802 and prevent the O-ring seal 802 from loosening or falling off.

[0042] Furthermore, in another embodiment, each of the two sealing ring blocks 8012 is provided with a mounting ring groove on the side near the O-ring seal 802, and a second elastic washer 804 is matched and connected in the mounting ring groove, with the two second elastic washers 804 in close contact with the O-ring seal 802.

[0043] The sealing ring retainer 8012 has an installation ring groove on its side wall for the second elastic washer 804. The second elastic washer 804 is embedded in the installation ring groove of the sealing ring retainer 8012 and is in close contact with the side wall of the O-ring seal 802, thereby further fixing the O-ring seal 802, compensating for assembly errors, and forming a third dynamic seal. The multi-stage sealing structure has excellent sealing performance, can withstand internal explosion pressure, and at the same time blocks dust and water immersion, making it suitable for a variety of high-risk environments.

[0044] Furthermore, in another embodiment, the sealing ring groove at the end furthest from the junction box hopper 3 is located on the side of the bolt assembly 4 closest to the junction box hopper 3, reducing the impact of the bolt assembly 4 on the sealing performance and resulting in a better sealing effect. Moreover, the sealing ring groove's proximity to the junction box hopper 3 ensures that the clamping force generated when the bolt is tightened acts directly on the sealing ring groove area, enhancing the fit between the sealing ring and the box body's mating surface and preventing sealing failure due to the dispersion of bolt preload.

[0045] Furthermore, in another embodiment, the bolt assembly 4 includes a bolt head 401, a bolt shank 402, a fixing washer 403, and a wire thread sleeve. The bolt shank 402 is threadedly connected to the junction box cover 2. The fixing washer 403 is sleeved on the outside of the bolt shank 402 and is located between the junction box cover 2 and the bolt head 401. The wire thread sleeve is sleeved on the outside of the bolt shank 402 at the end away from the bolt head 401 and is engaged with the junction box cover 2.

[0046] The bolt body shank 402 is threadedly connected to the junction box cover 2. Axial preload is applied by rotating the bolt body head 401. The fixing washer 403 reduces the vibration of the bolt body. The wire thread sleeve is embedded in the end of the bolt body shank 402 and engages with the junction box cover 2 to prevent loosening caused by thread wear. The bolt assembly 4 has strong overall stability and is not prone to loosening, reducing the risk of explosion-proof box failure due to bolt assembly loosening.

[0047] Furthermore, in another embodiment, the fixing washer 403 includes a first double-sided toothed washer 4031 and a second double-sided toothed washer 4032. The sides of the first double-sided toothed washer 4031 and the second double-sided toothed washer 4032 that are close to each other are provided with a first locking tooth 40311, and the sides of the first double-sided toothed washer 4031 and the second double-sided toothed washer 4032 that are far from each other are provided with a second locking tooth 40312. The tooth pitch of the first locking tooth 40311 is wider than the tooth pitch of the second locking tooth 40312, and the tooth surfaces of the first locking tooth 40311 and the second locking tooth 40312 face opposite directions.

[0048] The fixing washer 403 adopts a double-tooth washer structure. The second locking tooth 40312 of the first double-tooth washer 4031 engages with the surface of the bolt head 401. The second locking tooth 40312 of the second double-tooth washer 4032 engages with the surface of the junction box cover 2. The first locking tooth 40311 of the first double-tooth washer 4031 engages with the first locking tooth 40311 of the second double-tooth washer 4032. When the bolt is tightened, since the tooth surfaces of the first locking tooth 40311 and the second locking tooth 40312 face opposite directions, the bottom surface of the bolt head 401 contacts the second locking tooth 40312 of the first double-sided toothed washer 4031, causing the first double-sided toothed washer 4031 to move in the direction of bolt rotation until the first locking tooth 40311 of the first double-sided toothed washer 40311 meshes with the first locking tooth 40311 of the second double-sided toothed washer 4032. This causes the second locking tooth 40312 of the second double-sided toothed washer 4032 to engage with the surface of the junction box cover 2. The difference in tooth pitch achieves graded anti-loosening, ensuring the long-term stability of the bolt under vibration.

[0049] Furthermore, in another embodiment, the bolt assembly 4 is provided with a protective ring 404 on the top, the protective ring 404 protruding from the head 401 of the bolt body, preventing external debris from intruding into the threaded connection, thereby reducing wear on the bolt assembly 4 and extending the service life of the bolt assembly 4.

[0050] Furthermore, in another embodiment, the sealing ring groove has a depth of 2-4 mm and a width of 4-6 mm. In this embodiment, the sealing ring groove has a preferred depth of 2.65 mm and a preferred width of 5 mm.

[0051] Furthermore, in another embodiment, the O-ring 8, the first elastic washer 803, and the second elastic washer 804 are all selected from nitrile rubber, fluororubber, or silicone rubber. In this embodiment, the O-ring 8, the first elastic washer 803, and the second elastic washer 804 are all nitrile rubber seals, as nitrile rubber seals have better oil resistance and wear resistance.

[0052] Furthermore, in another embodiment, metal gaskets 9 are fixedly connected to both sides of the sealing ring 5 to prevent the sealing ring from deforming and overflowing when squeezed, while also improving wear resistance.

[0053] Furthermore, in another embodiment, the mounting plate 6 is fitted into the upper and lower ends of the mounting hole, and the fixing component 7 includes a mounting bolt 701, with a threaded sleeve 702 between the mounting bolt 701 and the mounting plate 6. The mounting plate 6 is fitted into the upper and lower ends of the mounting hole at the bottom of the junction box base 1, and is connected to the mounting bolt 701 through the threaded sleeve 702, ensuring that the box is securely installed.

[0054] Furthermore, in another embodiment, the fixing component 7 further includes a stop washer 703 and a locking washer 704 disposed between the mounting plate 6 and the bottom of the mounting hole to prevent the bolts from loosening and further ensure the secure installation of the housing.

[0055] Furthermore, in another embodiment, the outer wall of the junction box 3 is provided with a pressure plate 301 for fixing external cables and preventing the sealing ring from being damaged by cable vibration.

[0056] Working principle:

[0057] This utility model discloses a high-protection explosion-proof junction box. The junction box base 1 and junction box cover 2 are fastened together by bolt assembly 4, forming a closed cavity. A junction box compartment 3 is fixed to one side of the junction box base 1 for introducing external cables. A sealing ring 5 is provided on the side of the compartment near the junction box base 1. The sealing ring 5 of the junction box compartment 3 forms a dynamic seal with the inner wall of the junction box base 1, accommodating slight cable displacement or vibration and preventing external media from intruding along the cable surface. Sealing ring grooves are provided at the contact ends of the junction box base 1 and the junction box cover 2. Double-layer elastic sealing rings 8 are embedded in the grooves and tightly adhere to the side walls. When the bolt assembly 4 is tightened, the double-layer sealing rings are deformed under pressure, forming a sealing barrier that effectively prevents gas, liquid, and dust from entering the box. A mounting plate 6 is fixed to the bottom of the junction box base 1 through mounting holes. A fixing assembly 7 secures the entire junction box to equipment or a wall. Not only does it ensure the box remains stable under vibration or impact, preventing seal failure, but it also facilitates installation and maintenance, speeds up construction efficiency, and reduces operation and maintenance costs. The bolt body shank 402 of the bolt assembly 4 is threadedly connected to the junction box cover 2. Axial preload is applied by rotating the bolt body head 401, and the fixing washer 403 reduces the vibration of the bolt body. The wire thread sleeve is embedded in the end of the bolt body shank 402 and engages with the junction box cover 2 to prevent loosening caused by thread wear. The bolt assembly 4 has strong overall stability and is not prone to loosening, reducing the risk of explosion-proof box failure due to bolt assembly loosening. At the same time, the bolt and fixing washer 403 of the bolt assembly 4 are easy to disassemble, facilitating installation and maintenance.

[0058] Unless otherwise specified, in this utility model, terms such as "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe orientation or positional relationships in this utility model are for illustrative purposes only and should not be construed as limiting this utility model. For those skilled in the art, the specific meaning of the above terms can be understood in conjunction with the accompanying drawings and according to the specific circumstances.

[0059] Unless otherwise expressly specified and limited, the terms "set up," "connected," and "linked" in this utility model should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0060] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although this utility model has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A high-protection explosion-proof junction box, characterized in that: It includes a junction box base (1) and a junction box cover (2). A junction box hopper (3) is fixedly connected to one side of the junction box base (1). The end of the junction box cover (2) away from the junction box hopper (3) is fixed to the junction box base (1) by a bolt assembly (4). The junction box hopper (3) is provided with a sealing ring (5) on the side near the junction box seat (1), and the sealing ring (5) fits against the inner wall of the junction box seat (1). The junction box base (1) has a mounting hole at the bottom, and a mounting plate (6) and a fixing component (7) are fixed in the mounting hole. Both ends of the junction box base (1) and the junction box cover (2) that come into contact with each other are provided with sealing ring grooves. The openings of the two sealing ring grooves of the junction box base (1) correspond to the openings of the two sealing ring grooves of the junction box cover (2). Each sealing ring groove of the junction box base (1) and the inner side of the corresponding sealing ring groove of the junction box cover (2) are provided with a double-layer elastic sealing ring (8). The double-layer elastic sealing ring (8) is pasted on the sealing ring grooves on both sides and closely attached to the sealing ring grooves.

2. The high-protection explosion-proof junction box according to claim 1, characterized in that: The double-layer elastic sealing ring (8) includes a circular fixing block (801), an O-ring (802), and a first elastic washer (803). The O-ring (802) is fixed on the arc-shaped sidewall of the circular fixing block (801). There are two elastic washers (803) and they are respectively fixedly connected to the two planar sidewalls of the circular fixing block (801). The O-ring (802) is in close contact with the bottom of the sealing ring groove of the junction box seat (1) and the junction box cover (2), and the two elastic washers (803) are in close contact with the sidewall of the sealing ring groove of the junction box seat (1) and the junction box cover (2).

3. The high-protection explosion-proof junction box according to claim 2, characterized in that: The circular fixing block (801) includes an integrally formed fixing block body (8011) and two sealing ring locking blocks (8012) respectively disposed at both ends of the outer ring of the fixing block body (8011). The two sealing ring locking blocks (8012) are used to lock the O-ring (802).

4. The high-protection explosion-proof junction box according to claim 3, characterized in that: Each of the two sealing ring blocks (8012) has a mounting ring groove on the side near the O-ring seal (802), and a second elastic washer (804) is matched and connected in the mounting ring groove. The two second elastic washers (804) are in close contact with the O-ring seal (802).

5. A high-protection explosion-proof junction box according to claim 4, characterized in that: The O-ring (8), the first elastic washer (803), and the second elastic washer (804) are all one of nitrile rubber, fluororubber, or silicone rubber.

6. The high-protection explosion-proof junction box according to claim 1, characterized in that: The bolt assembly (4) includes a bolt head (401), a bolt shank (402), and a fixing washer (403). The bolt shank (402) is threadedly connected to the junction box cover (2). The fixing washer (403) is sleeved on the outside of the bolt shank (402) and is located between the junction box cover (2) and the bolt head (401). The fixing washer (403) includes a first double-sided toothed washer (4031) and a second double-sided toothed washer (4032). The sides of the first double-sided toothed washer (4031) and the second double-sided toothed washer (4032) that are close to each other are provided with a first locking tooth (40311). The sides of the first double-sided toothed washer (4031) and the second double-sided toothed washer (4032) that are far from each other are provided with a second locking tooth (40312). The tooth pitch of the first locking tooth (40311) is wider than the tooth pitch of the second locking tooth (40312). The tooth surfaces of the first locking tooth (40311) and the second locking tooth (40312) face opposite directions.

7. A high-protection explosion-proof junction box according to claim 1, characterized in that: The sealing ring groove has a depth of 2-4mm and a width of 4-6mm.

8. A high-protection explosion-proof junction box according to claim 1, characterized in that: Metal gaskets (9) are fixedly connected to both sides of the sealing ring (5).

9. A high-protection explosion-proof junction box according to claim 1, characterized in that: The mounting plate (6) is fitted into the upper and lower ends of the mounting hole; the fixing component (7) includes a mounting bolt (701), and a threaded sleeve (702) is provided between the mounting bolt (701) and the mounting plate (6).

10. A high-protection explosion-proof junction box according to claim 9, characterized in that: The fixing component (7) also includes a stop washer (703) and a locking washer (704) disposed between the mounting plate (6) and the bottom of the mounting hole.

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