An explosion-proof terminal box cover and special tool

Abstract

This utility model relates to the field of junction box cover maintenance technology, and discloses an explosion-proof junction box cover and a special tool, including: a cover, a cylinder concentrically fixed to the inner surface of the cover, an external thread machined on the outer wall of the cylinder, a pair of U-shaped blocks fixed to the outer surface of the cover, a pair of insertion holes on one side surface of the U-shaped blocks, and a special tool connected inside the U-shaped blocks. This explosion-proof junction box cover and special tool, through the coordinated cooperation of the various components, slide laterally towards the U-shaped blocks, the insertion rod passes through the insertion holes and penetrates the U-shaped blocks, a magnetic plate is fixed to the surface of the sleeve plate and magnetically attracts the U-shaped blocks, and then by grasping the handle and applying appropriate force, the cylinder can be easily rotated, thereby rotating the cover. No manual operation is required, greatly reducing the difficulty of operation and avoiding hand injuries caused by difficult manual operation, thus improving the safety and convenience of operation.

Description

Technical Field

[0001] This utility model relates to the field of junction box cover maintenance technology, specifically an explosion-proof junction box cover and a special tool. Background Technology

[0002] In the field of electrical engineering, explosion-proof junction boxes, as key integrated connection and conversion devices for electrical circuits, are widely used in various locations with explosion hazards, such as the petrochemical and coal mining industries. The connection method between the explosion-proof junction box cover and the junction box directly affects its explosion-proof performance and sealing effect. Currently, the common connection method is threaded connection, which has advantages such as simple structure and reliable connection, and can meet basic explosion-proof and sealing requirements. In terms of sealing, explosion-proof junction boxes typically need to prevent electrical sparks or high temperatures generated by internal electrical components from igniting external explosive gas mixtures, and also need to prevent external dust, moisture, and other impurities from entering the box and affecting the normal operation of electrical components. Therefore, the sealing requirements between the cover and the junction box are extremely high. Existing sealing technologies mainly achieve this by setting sealing gaskets at the threaded connection or using sealant. For example, in some explosion-proof junction boxes, an oil-resistant and aging-resistant rubber plate is installed between the threaded mating surfaces of the cover and the junction box to ensure sealing effect. However, in actual use, due to environmental factors, installation processes, and other factors, the sealing effect may be affected, leading to a decrease in explosion-proof performance.

[0003] Explosion-proof junction boxes are often used in outdoor environments, which are complex and varied, facing harsh natural conditions such as high and low temperatures, rain, snow, and sandstorms. These environmental factors can severely affect the performance of the explosion-proof junction box cover. Due to the outdoor environment, the threaded connection between the cover and the junction box may become very tight due to rust, dust accumulation, etc., making it very difficult to turn the cover counterclockwise.

[0004] Currently, when disassembling the junction box cover, it is usually done by hand or with simple tools such as pipe clamps. Hand rotation is often difficult when the threaded connection is tight and can easily injure the operator's hands. Although pipe clamps can increase the rotation force to some extent, their structure and working principle limit their rotation effect and can easily damage the surface of the cover, affecting its sealing and explosion-proof performance. For example, in some explosion-proof junction boxes that have not been inspected for a long time, the threaded connection is severely rusted, making it difficult to remove even with pipe clamps, which brings great difficulties to the maintenance work, increases maintenance time and cost. At the same time, improper disassembly methods may also damage the overall structure of the explosion-proof junction box, affecting its explosion-proof performance and safety. Utility Model Content

[0005] The purpose of this utility model is to provide an explosion-proof junction box cover and a special tool to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an explosion-proof junction box cover, comprising: a cover, a cylinder concentrically fixed to the inner surface of the cover, an external thread processed on the outer wall of the cylinder, a pair of U-shaped blocks fixed to the outer surface of the cover, a pair of insertion holes opened on one side surface of the U-shaped blocks, and a special tool connected inside the U-shaped blocks.

[0007] Preferably, the outer surface of the lid is machined with warning labels.

[0008] Preferably, the special tool includes: a square tube, which is laterally located on the outer surface of the box lid, the outer wall of the square tube is in contact with the inner wall of the U-shaped block, a handle is connected to the right side of the square tube, a pair of sleeve plates are fixedly sleeved on the outer wall of the square tube, and a plug rod is inserted into the inside of the insertion hole, and the plug rod is fixedly connected to the sleeve plate.

[0009] Preferably, a magnetic absorbing sheet is fixed to the surface of the sleeve plate facing the U-shaped block, and the magnetic absorbing sheet and the contact surface of the U-shaped block are magnetically attracted.

[0010] Preferably, the square tube has a square rod inside, the outer wall of the square rod is clearance-fitted with the inner wall of the square tube, the right end of the square rod is fixedly connected to the handle, and the right end of the front surface of the square tube is threaded with a bolt, which penetrates a portion of the square tube and abuts against the square rod.

[0011] Preferably, an anti-slip strip is embedded and fixed to the front surface of the square rod, and the bolt is tightened against the anti-slip strip.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: the explosion-proof junction box cover and special tool have the following advantages over traditional technology: By coordinating the various components, when the lid needs to be rotated, the operator first places the square tube inside a pair of U-shaped blocks, then slides it laterally towards the U-shaped blocks. The insert rod passes through the insertion hole into the U-shaped blocks, and the surface of the sleeve plate is fixed with a magnetic plate that magnetically attracts the U-shaped blocks. Then, by holding the handle and applying appropriate force, the square tube can be easily rotated, thereby rotating the lid. This eliminates the need for direct hand operation, greatly reducing the difficulty of operation and avoiding hand injuries caused by the difficulty of hand operation, thus improving the safety and convenience of operation.

[0013] Through the coordinated operation of various components, if the threaded connection of the lid is severely rusted and it is difficult to turn the handle even with force, the operator can turn the bolt counterclockwise to move it away from the square rod. At this time, the square rod can be pulled out from the inside of the square tube. Then, turn the bolt clockwise to limit the position of the square rod, which can increase the lever arm length, generate greater torque, effectively enhance the rotation effect, and easily disassemble the lid. This can further improve disassembly efficiency and reduce maintenance time. Attached Figure Description

[0014] The above and other features, advantages, and aspects of the embodiments of this disclosure will become more apparent from the accompanying drawings and the following detailed description. Throughout the drawings, the same or similar reference numerals denote the same or similar elements. It should be understood that the drawings are schematic, and the originals and elements are not necessarily drawn to scale.

[0015] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 for Figure 1 Enlarged view of point A in the middle; Figure 3 for Figure 2 Side sectional view of the square tube and square rod; Figure 4 for Figure 1 Side view of the middle box lid and U-shaped block.

[0016] In the picture: 1. Box lid, 2. Cylinder, 3. External thread, 4. Warning sign, 5. U-shaped block, 6. Insertion hole, 7. Square tube, 8. Handle, 9. Sleeve plate, 10. Insert rod, 11. Magnetic plate, 12. Square rod, 13. Bolt, 14. Anti-slip strip. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Please see Figures 1-4This utility model provides a technical solution: an explosion-proof junction box cover, comprising: a cover 1, a cylinder 2 concentrically fixed to the inner surface of the cover 1, an external thread 3 machined on the outer wall of the cylinder 2, the external thread 3 having a suitable pitch and thread height, which can achieve a tight and stable threaded connection with the corresponding internal thread on the external explosion-proof junction box, effectively preventing loosening of the connection due to vibration or external factors, and with the matching sealing ring, can ensure good sealing performance under various harsh working conditions, prevent leakage of internal flammable and explosive gases, and ensure explosion-proof safety. A pair of U-shaped blocks 5 are fixed to the outer surface of the cover 1. The U-shaped blocks 5 are made of high-strength alloy material containing ferromagnetic elements such as iron, cobalt, and nickel. The U-shaped blocks 5 and the cover 1 are integrally formed, with sufficient strength and rigidity, and can withstand various forces generated during the installation and operation of special tools without deformation or damage. A pair of insertion holes 6 are opened on one side surface of the U-shaped blocks 5. The diameter of the insertion holes 6 can ensure that the insertion rod 10 on the special tool can be quickly inserted and accurately positioned for installation. The special tool is connected inside the U-shaped blocks 5.

[0019] Furthermore, the outer surface of the cover 1 is machined with a warning sign 4, which reads "Do not open the cover while it is powered on". This sign reminds operators to pay attention to the dangers of the explosion-proof junction box, standardize the operating procedures, avoid safety accidents caused by misoperation, and strictly follow safety regulations to effectively reduce the risk of accidents.

[0020] Furthermore, the special tool includes: a square tube 7, which is horizontally located on the outer surface of the lid 1. The outer wall of the square tube 7 fits against the inner wall of the U-shaped block 5. The square tube 7 is made of high-quality stainless steel, which can effectively resist the corrosion of the external environment during use and prevent rust from affecting the performance and service life of the tool. A handle 8 is connected to the right side of the square tube 7. The handle 8 is easy for the operator to hold. The surface of the grip part is treated with anti-slip treatment, such as adding anti-slip texture or wrapping with anti-slip rubber sleeve, which can increase the friction between the operator's hand and the handle. A pair of sleeve plates 9 are fixedly fitted to the outer wall of the square tube 7. The sleeve plates 9 are firmly fixed to the square tube 7 by welding to ensure that they will not loosen or fall off during operation. A plug rod 10 is inserted into the socket 6. The plug rod 10 is fixedly connected to the sleeve plate 9. The diameter of the plug rod 10 matches the diameter of the socket 6 to ensure that it fits tightly after insertion and will not wobble. The end of the plug rod 10 has a tapered structure, which makes it easy to insert into the socket 6.

[0021] Furthermore, a magnetic absorbing piece 11 is fixed to the surface of the sleeve plate 9 facing the U-shaped block 5. The magnetic absorbing piece 11 is made of a strong magnetic material, such as a neodymium iron boron magnet, which has a strong magnetic attraction. The contact surface of the magnetic absorbing piece 11 and the U-shaped block 5 magnetically attracts each other. This magnetic attraction method not only allows the special tool to be tightly connected with the U-shaped block 5 to form a stable overall structure, but also allows the operator to simply bring the square tube 7 close to the U-shaped block 5, and the magnetic absorbing piece 11 will automatically attract the two together, improving installation efficiency.

[0022] Furthermore, a square rod 12 is provided inside the square tube 7. The outer wall of the square rod 12 is fitted with the inner wall of the square tube 7 with a clearance, which ensures that the square rod 12 can slide smoothly inside the square tube 7 and limits the range of shaking of the square rod 12, ensuring that the movement of the square rod 12 is stable and reliable during operation. The right end of the square rod 12 is fixedly connected to the handle 8, so that the force applied by the operator through the handle 8 can be directly transmitted to the square rod 12. A bolt 13 is threadedly connected to the right end of the front surface of the square tube 7. The bolt 13 penetrates a part of the square tube 7 and abuts against the square rod 12. By rotating the bolt 13, the tightness between the bolt 13 and the square rod 12 can be adjusted, thereby fixing the position of the square rod 12 inside the square tube 7.

[0023] Furthermore, an anti-slip strip 14 is embedded and fixed to the front surface of the square rod 12. The anti-slip strip 14 is made of a material with a high coefficient of friction, such as rubber or silicone, and its surface has a rough texture, which can increase the friction between it and the bolt 13. When the bolt 13 and the anti-slip strip 14 are pressed together, the anti-slip strip 14 can prevent the bolt 13 from loosening due to vibration or force during operation, further ensuring the stability of the position of the square rod 12.

[0024] Working principle: The principle of coordination during normal disassembly: When it is necessary to rotate and disassemble the cover 1 of the explosion-proof junction box, the operator first places the square tube 7 of the special tool inside a pair of U-shaped blocks 5, and then slides the square tube 7 laterally towards the U-shaped blocks 5. During the sliding process, the plug 10 fixed on the sleeve plate 9 fixed to the outer wall of the square tube 7 will pass through the plug hole 6 opened on one side of the U-shaped block 5. At the same time, the magnetic suction piece 11 fixed to the surface of the sleeve plate 9 will generate a magnetic attraction with the U-shaped block 5, so that the square tube 7 and the U-shaped block 5 are tightly connected to form a stable integral structure. At this time, the operator holds the handle 8 connected to the right side of the square tube 7 and applies appropriate force. Since the square tube 7 and the cover 1 achieve force transmission through this connection method, the square tube 7 can be easily rotated, thereby rotating the cover 1 to complete the disassembly action. This design eliminates the need for the operator to operate the cover 1 directly with bare hands, greatly reducing the difficulty of operation, avoiding hand injuries caused by the difficulty of operation with bare hands, and improving the safety and convenience of operation.

[0025] The principle of lever arm adjustment for dealing with rusted threads: When the threaded connection of the cover 1 is severely rusted, making it difficult to rotate even when force is applied to the handle 8, the operator should rotate the bolt 13, which is threaded at the right end of the front surface of the square tube 7, counterclockwise. This will gradually move the bolt 13 away from the square rod 12 inside the square tube 7. As the bolt 13 moves, the tightness between the square rod 12 and the square tube 7 will be released, allowing the square rod 12 to be pulled out from inside the square tube 7. After the square rod 12 is pulled out, the operator should adjust it to a suitable position as needed, and then rotate the bolt 13 clockwise. This will cause the bolt 13 to penetrate the square tube 7 and engage with the square rod 12, thus limiting the position of the square rod 12. This increases the lever arm length. According to the lever principle, under the same force, a longer lever arm produces a greater torque. Therefore, this effectively enhances the rotation effect, allowing the operator to easily disassemble the cover 1, which is difficult to rotate due to rusted threads. This further improves disassembly efficiency and reduces maintenance time.

[0026] The principle behind component structure ensuring stable operation: The inner surface of the cover 1 is concentrically fixed to a cylindrical tube 2, the outer wall of which is machined with external threads 3. This allows the cover 1 to be tightly fitted with the external explosion-proof junction box through threaded connection, ensuring the stability and sealing of the connection. A pair of U-shaped blocks 5 are fixed to the outer surface of the cover 1, providing a stable support structure for the installation of the special tool. A pair of insertion holes 6 on one side of the U-shaped block 5 cooperate with the insertion rod 10 on the upper plate 9 of the special tool, realizing the precise positioning and connection of the special tool with the cover 1. The design of the square tube 7 fitting snugly to the inner wall of the U-shaped block 5, and the gap fit between the outer wall of the square rod 12 and the inner wall of the square tube 7, ensure that each component remains relatively stable during movement, reducing shaking and friction, reducing component wear, and extending the service life of the tool. At the same time, the anti-slip strip 14 embedded and fixed to the front surface of the square rod 12 increases the friction of the contact surface when the bolt 13 is tightened against the square rod 12, further ensuring the stability of the position of the square rod 12, and ensuring the reliability and stability of the entire tool during operation.

[0027] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An explosion-proof junction box cover, comprising: The lid (1) is characterized in that: a cylinder (2) is concentrically fixed to the inner surface of the lid (1), an external thread (3) is processed on the outer wall of the cylinder (2), a pair of U-shaped blocks (5) are fixed to the outer surface of the lid (1), and a pair of insertion holes (6) are opened on one side surface of the U-shaped blocks (5).

2. The explosion-proof junction box cover according to claim 1, characterized in that: The outer surface of the lid (1) is machined with a warning label (4).

3. A special tool, said special tool being used for the explosion-proof junction box cover according to any one of claims 1 to 2, characterized in that: The special tool includes: a square tube (7), which is located laterally on the outer surface of the box cover (1). The outer wall of the square tube (7) is in contact with the inner wall of the U-shaped block (5). A handle (8) is connected to the right side of the square tube (7). A pair of sleeve plates (9) are fixedly fitted to the outer wall of the square tube (7). A plug rod (10) is inserted into the inside of the insertion hole (6). The plug rod (10) is fixedly connected to the sleeve plate (9).

4. The special tool according to claim 3, characterized in that: A magnetic absorbing piece (11) is fixed to the surface of the sleeve plate (9) that faces the U-shaped block (5), and the contact surface of the magnetic absorbing piece (11) and the U-shaped block (5) are magnetically attracted.

5. The special tool according to claim 3, characterized in that: The square tube (7) is provided with a square rod (12) inside. The outer wall of the square rod (12) is fitted with the inner wall of the square tube (7) with a clearance. The right end of the square rod (12) is fixedly connected to the handle (8). The right end of the front surface of the square tube (7) is threaded with a bolt (13). The bolt (13) passes through a part of the square tube (7) and abuts against the square rod (12).

6. The special tool according to claim 5, characterized in that: The front surface of the square rod (12) is embedded with an anti-slip strip (14), and the bolt (13) abuts against the anti-slip strip (14).

Images