Access control anti-explosion junction box

Abstract

The application relates to the technical field of explosion-proof junction boxes, and proposes an access control explosion-proof junction box which comprises a mounting support, two sealing boxes are arranged at the upper ends of the mounting support, a plurality of junction box mechanisms are arranged between the two sealing boxes, buffer expansion pipes are connected between the junction box mechanisms and the sealing boxes, a wire outlet pipe and a wiring structure are arranged in the junction box mechanism in a sleeving mode, a wiring column is connected to the middle of the wiring structure in a clamping mode, and the two ends of the wiring column are respectively inserted into the interiors of the two sealing boxes. The junction box mechanisms are connected in series through the sealing boxes, each junction box mechanism can clamp and connect the wire outlet pipe on the wiring column through the wiring structure, the wire outlet pipe and the wiring column are connected in conduction, the wiring directions of the junction box mechanisms and the wire outlet pipe can be adjusted in any of the four directions of up, down, front and back, and the device is convenient to use.

Description

Technical Field

[0001] This invention relates to the field of explosion-proof junction box technology, and more particularly to an explosion-proof junction box for access control systems. Background Technology

[0002] In home renovation, junction boxes are one of the electrical accessories. Because the wires used in renovation run through conduits, junction boxes are used as transitions at the joints of the wires (such as when the wire is long or the conduit needs to turn a corner). The conduit connects to the junction box, and the wires inside the conduit are connected in the junction box, which serves to protect and connect the wires. Currently, when wires are used in junction boxes for a long time, the pressure will gradually increase, which may lead to an explosion during use, affecting the use of the junction box.

[0003] Existing explosion-proof junction boxes generally use fixed 2-way or 3-way terminals for wiring connections. When installing explosion-proof junction boxes on some important equipment or on narrow installation platforms, since the junction box terminals are fixed, the wiring needs to be changed by bending the cable. When the cable is bent, the stress often applies lateral force to the fixed terminals (i.e., connectors). Over time, the terminals are prone to loosening or deformation, affecting the airtightness of the explosion-proof junction box and reducing its safety protection performance.

[0004] Therefore, we have made improvements to this and proposed an explosion-proof junction box for access control. Summary of the Invention

[0005] The purpose of this invention is to provide an explosion-proof access control junction box to solve the problems mentioned in the background art.

[0006] To achieve the above-mentioned objectives, the present invention provides an explosion-proof access control junction box, including a mounting bracket. Two sealed boxes are respectively mounted on the upper two ends of the mounting bracket. Multiple junction box mechanisms are arranged between the two sealed boxes. Buffer telescopic tubes are connected between the junction box mechanisms and between the junction box mechanisms and the sealed boxes. A cable outlet pipe and a wiring structure are sleeved inside the junction box mechanism, and a terminal post is clamped and connected in the middle of the wiring structure. The two ends of the terminal post are respectively inserted into the interior of the two sealed boxes.

[0007] As a further embodiment of the present invention, the mounting bracket includes a mounting plate with a plurality of mounting holes in the middle. Columns are vertically connected to both ends of the mounting plate. A sleeve hole is provided at the upper end of the column. Rollers are installed around the inner wall of the sleeve hole. A connecting plate is fixedly installed on the inner side of the column. A first spring is fixedly connected between the connecting plate and the sealing box.

[0008] As a further embodiment of the present invention, the sealing box includes a plug, a sleeve is fixedly installed in the middle of the plug, the sleeve extends to both ends, the outer extension of the sleeve is fitted into the sleeve hole, and rollers are installed around the inner wall of the sleeve hole, the rollers roll against the outer surface of the sleeve, a compression spring is fixedly connected inside the sleeve, and insertion holes are installed at both the upper and lower ends of the plug, a positioning rod is inserted into the insertion hole, and both ends of the positioning rod are fixed to the sealing box by self-tightening bolts.

[0009] As a further embodiment of the present invention, the junction box mechanism includes a cylindrical box body, on which a first connecting pipe and a second connecting pipe are fixedly installed. The first connecting pipe and the second connecting pipe are located on the same axis, and the outlet pipe is sleeved inside the first connecting pipe. The wiring structure is connected inside the second connecting pipe.

[0010] As a further embodiment of the present invention, the outlet tube includes an insulating sleeve, and a second spring is fixedly connected inside the insulating sleeve, the second spring being fixedly connected to the inner side of the first connecting tube.

[0011] As a further embodiment of the present invention, the buffer telescopic tube is a W-shaped corrugated metal tube, and the buffer telescopic tube is made of stainless steel.

[0012] As a further embodiment of the present invention, the terminal is a cube-shaped brass prism.

[0013] As a further embodiment of the present invention, the wiring structure includes a pressing frame, the pressing frame being U-shaped and surrounding the outside of the terminal block on three sides, one end of the pressing frame being connected to a cable, the cable being sleeved inside the outlet pipe, and a contact piece being fixedly installed on the part of the cable extending into the inner side of the pressing frame, the other end of the pressing frame being rotatably connected to a bolt, the bolt being threadedly connected to a second connecting pipe.

[0014] As a further embodiment of the present invention, the length and width of the pressing frame are both greater than the diagonal distance of the terminal block, and both the pressing frame and the bolt are made of insulating material.

[0015] The explosion-proof junction box for access control provided by this invention has the following advantages:

[0016] 1. By setting up multiple junction box mechanisms and connecting the sealing box and junction box mechanisms in series through a sealing box, each junction box mechanism can clamp and connect the outlet pipe to the terminal block through the wiring structure, connecting the outlet pipe and the terminal block to conduct electricity. Moreover, the wiring direction of the junction box mechanism and the outlet pipe can be adjusted arbitrarily in four directions: up, down, forward, and backward, which facilitates the use of the device.

[0017] 2. By connecting the junction box mechanism with the junction box mechanism and the sealing box with the junction box mechanism, the special corrugated design of the buffer telescopic tube can use the compression spring and the first spring to tighten and gather the multiple junction box mechanisms in the middle during the use of the device. When the pressure of the junction box mechanism increases, the sealing tube structure formed by the sealing box, the junction box mechanism and the buffer telescopic tube will extend to both sides due to the increased pressure. This can effectively buffer the pressure impact, absorb the explosion vibration and thermal expansion, and reduce the risk of spark release caused by the junction box explosion. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A schematic diagram of the structure of an explosion-proof access control junction box provided in this application. Figure 1 ;

[0020] Figure 2 A schematic diagram of the structure of an explosion-proof access control junction box provided in this application. Figure 2 ;

[0021] Figure 3 A structural cross-sectional view of an explosion-proof junction box for access control provided in this application;

[0022] Figure 4 A schematic diagram of the mounting bracket structure for an explosion-proof junction box for access control provided in this application;

[0023] Figure 5 A schematic diagram of the roller structure of an explosion-proof junction box for access control provided in this application;

[0024] Figure 6 A sectional view of the sealed box structure of an explosion-proof access control junction box provided in this application;

[0025] Figure 7 A schematic diagram of the junction box mechanism and terminal block structure of an explosion-proof junction box for access control provided in this application;

[0026] Figure 8 A cross-sectional view of the junction box mechanism of an explosion-proof junction box for access control provided in this application;

[0027] Figure 9 A schematic diagram of the wiring structure of an explosion-proof junction box for access control provided in this application;

[0028] Figure 10 forFigure 3 Enlarged schematic diagram of structure A;

[0029] Figure 11 for Figure 3 An enlarged schematic diagram of the B structure.

[0030] In the diagram: 1. Mounting bracket; 11. Mounting plate; 12. Mounting hole; 13. Column; 14. Sleeve hole; 15. Roller; 16. Connecting plate; 17. First spring; 2. Sealing box; 21. Plug; 22. Sleeve; 23. Insertion hole; 24. Compression spring; 3. Junction box mechanism; 31. Box body; 32. First connecting pipe; 33. Second connecting pipe; 4. Buffer telescopic pipe; 5. Outlet pipe; 51. Insulating sleeve; 52. Second spring; 6. Terminal post; 7. Wiring structure; 71. Press frame; 72. Cable; 73. Connecting piece; 74. Bolt; 8. Positioning rod. Detailed Implementation

[0031] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0032] like Figures 1-11 As shown, this embodiment proposes an explosion-proof access control junction box, including a mounting bracket 1. Two sealed boxes 2 are respectively mounted on the upper ends of the mounting bracket 1. Multiple junction box mechanisms 3 are arranged between the two sealed boxes 2. Buffer telescopic tubes 4 connect the junction box mechanisms 3 to each other and to each sealed box 2. A cable outlet tube 5 and a wiring structure 7 are sleeved inside the junction box mechanism 3. A terminal block 6 is clamped and connected in the middle of the wiring structure 7. The two ends of the terminal block 6 are respectively inserted into the interior of the two sealed boxes 2. One end is connected to a wire that penetrates the sealed box 2. This structure constitutes the core series-sealed cavity of the entire explosion-proof junction box. Multiple junction box mechanisms 3 are flexibly connected by buffer telescopic tubes 4 and sealed at both ends by two sealed boxes 2, forming a retractable and sealed pipeline system. Terminal 6 runs through the entire system as a unified conductive busbar. Outlet pipe 5 and wiring structure 7 are responsible for introducing external cables and reliably connecting them to the busbar terminal 6. This design not only realizes multiple wiring, but its airtightness and retractability are also the key to explosion protection and pressure buffering.

[0033] Mounting bracket 1 includes mounting plate 11, with multiple mounting holes 12 in the middle of mounting plate 11. Both ends of mounting plate 11 are vertically connected to columns 13. The upper end of column 13 has a sleeve hole 14, and a connecting plate 16 is fixedly mounted on the inner side of column 13. A first spring 17 is fixedly connected between connecting plate 16 and sealing box 2. Mounting bracket 1 is the supporting and foundational structure of the entire device. Mounting plate 11 and mounting holes 12 are used to securely mount the entire junction box to the wall or equipment platform. Column 13 and its sleeve hole 14 are used to accommodate and guide the sleeve 22 of sealing box 2, restricting its movement only along the axis. Connecting plate 16 and first spring 17 work together to continuously apply an inward elastic preload to sealing box 2. This force is transmitted through sealing box 2 and buffer telescopic tube 4 to all junction box mechanisms 3, keeping the entire series tube body in a compressed and aggregated state in the initial state, providing a buffer stroke to cope with internal pressure expansion.

[0034] The sealing box 2 includes a plug 21, with a sleeve 22 fixedly installed in the middle of the plug 21. The sleeve 22 extends to both ends, with the outwardly extended portion fitting into the hole 14. Rollers 15 are installed around the inner wall of the hole 14, rolling against the outer surface of the sleeve 22. A compression spring 24 is fixedly connected inside the sleeve 22. Insertion holes 23 are installed at both the upper and lower ends of the plug 21, with positioning rods 8 inserted into the holes 23. Both ends of the positioning rods 8 are fixed to the sealing box 2 by self-tightening bolts. The sealing box 2 is a sealing and pressure buffer unit at the end of the system. The plug 21 is used for... At the end of the closed pipe, the sleeve 22 engages with the sleeve hole 14 on the mounting bracket 1, and with the support of the roller 15, the sealing box 2 is allowed to slide along the axis with low friction. This is the key to achieving the expansion and contraction of the overall structure. The internal compression spring 24 further enhances the buffering capacity at the end and works in conjunction with the first spring 17. The positioning rod 8 passes through the two sealing boxes 2 and is fixed by the self-tightening bolts at both ends. Its main function is to prevent the two sealing boxes 2 from rotating relative to each other under internal pressure or spring action, ensuring that the outgoing wire direction of all junction box mechanisms 3 is consistent and maintaining the stability of the entire series structure.

[0035] The junction box mechanism 3 includes a cylindrical box body 31, on which a first connecting pipe 32 and a second connecting pipe 33 are fixedly installed. The first connecting pipe 32 and the second connecting pipe 33 are located on the same axis, and the outlet pipe 5 is sleeved inside the first connecting pipe 32. The wiring structure 7 is connected inside the second connecting pipe 33. The junction box mechanism 3 is the basic unit for realizing line connection and direction adjustment. The cylindrical box body 31 provides robust protection and a sealed space. The first connecting pipe 32 and the second connecting pipe 33 are located at both ends of the axis and are used to connect the buffer telescopic pipe 4 to ensure the smooth pressure transmission path. The outlet pipe 5 is led out from the inside of the first connecting pipe 32, which determines the outlet direction of the cable. Since the entire junction box mechanism 3 can rotate through the buffer telescopic pipe 4, the outlet pipe 5 on it can be flexibly adjusted to multiple directions such as up, down, left, and right to meet different wiring needs and avoid the problem of bending the cable when fixing the terminal.

[0036] The buffer expansion tube 4 is a W-shaped corrugated metal pipe made of 304 or 316 stainless steel. It is the core flexible connection and pressure buffer element. Its W-shaped corrugated design gives it great axial expansion capacity and a certain degree of bending flexibility. It can effectively absorb the length changes and vibrations caused by thermal expansion, internal pressure fluctuations or explosive impacts. The use of 304 or 316 stainless steel ensures that it has high strength, corrosion resistance and explosion-proof performance. It can maintain structural integrity and sealing in harsh environments and prevent internal sparks or explosive products from escaping.

[0037] The outlet pipe 5 includes an insulating sleeve 51, and a second spring 52 is fixedly connected inside the insulating sleeve 51. The second spring 52 is fixedly connected to the inner side of the first connecting pipe 32.

[0038] Terminal 6 is a cube-shaped brass prism. As a unified conductive busbar, the cube-shaped prism provides a flat and stable connection surface for each plane, which facilitates reliable clamping of the contact piece 73 of the wiring structure 7. Brass has good conductivity, mechanical strength and corrosion resistance, making it suitable as an important electrical connection component.

[0039] The wiring structure 7 includes a pressing frame 71, which is U-shaped and surrounds the outside of the terminal block 6 on three sides. One end of the pressing frame 71 is connected to a cable 72, which is sleeved inside the outlet pipe 5. The part of the cable 72 extending into the inner side of the pressing frame 71 is fixedly installed with a contact piece 73. The other end of the pressing frame 71 is rotatably connected to a bolt 74, which is threadedly connected to the second connecting pipe 33. The wiring structure 7 is a module that realizes the connection and disconnection of the cable and the busbar terminal block 6. The U-shaped pressing frame 71 forms a clamping mechanism. When the bolt 74 is tightened, the bolt head will push the pressing frame 71 to move towards the terminal block 6, thereby pressing the contact piece 73 tightly against the side of the terminal block 6 to form a reliable electrical connection. Loosening the bolt 74 can disconnect the connection, which is convenient for installation and maintenance. The whole structure is simple and the connection is reliable.

[0040] The length and width of the pressing frame 71 are both greater than the diagonal distance of the terminal block 6. Both the pressing frame 71 and the bolt 74 are made of insulating material. This design ensures that the pressing frame 71 can completely "sit" on the terminal block 6, providing uniform crimping force to the contact piece 73 and preventing undesirable short circuits with the terminal block 6. The pressing frame 71 and the bolt 74 are made of insulating materials such as engineering plastics and bakelite, which play a crucial role in insulation, preventing electric shock caused by accidental contact with operating tools or personnel, and avoiding short circuits between different phase lines through the wiring structure itself, thus ensuring electrical safety.

[0041] Specifically, the usage steps for this explosion-proof access control junction box are as follows:

[0042] Installation and fixing: First, determine the installation location based on the on-site installation space and wiring requirements. Use bolts to pass through the mounting holes 12 on the mounting plate 11 to firmly fix the entire mounting bracket 1 to the wall or platform.

[0043] Determine the layout: Based on the direction and quantity of cables entering and exiting the access control system equipment, plan the outgoing direction of each junction box mechanism 3. Gently rotate each junction box mechanism 3 by hand to adjust the outgoing pipe 5 on its first connecting pipe 32 to the required direction, up, down, left, or right.

[0044] Cable routing: Cables from access controllers, card readers, electric locks, and other devices are routed through their respective outlet pipes 5 and led to the wiring structure 7 inside the junction box mechanism 3.

[0045] Connecting the wires: Loosen the bolts 74 of the wiring structure 7, place the contact piece 73 at the end of the cable 72 on a suitable side of the terminal 6. Generally, lines of the same phase or function are connected on the same side or in a nearby position. Then tighten the bolts 74 and press the contact piece 73 firmly onto the terminal 6 using the pressing frame 71 to ensure a reliable electrical connection. Repeat this step to complete the connection of all lines. The main power line introduced at one end of the terminal is also connected in this manner.

[0046] Sealing and fixing: After ensuring that all cable connections are correct and secure, explosion-proof putty or sealing rings can be used to seal between the outlet pipe 5 and the cable, and at the connection of the buffer expansion pipe 4, etc., to enhance the overall explosion-proof and protective performance. Check whether the positioning rod 8 has been inserted and tightened with flange bolts to prevent the sealing box 2 from rotating.

[0047] Operation and buffering: After the device is put into use, under normal circumstances, the entire system remains compact under the preload of the first spring 17 and the compression spring 24. If an electric arc or spark is generated inside due to a fault, causing a sudden increase in pressure, the pressure will act on the end faces of each sealing box 2 and junction box mechanism 3, compressing the first spring 17 and the compression spring 24, pushing the sealing box 2 to slide outward along the sleeve hole 14. At the same time, the buffer telescopic tube 4 is stretched, thereby effectively absorbing and buffering the explosion energy, reducing the internal pressure and temperature, preventing the explosion flame and high-temperature gas from rushing out of the box, and ensuring safety. The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0048] The above embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Although the invention has been described in detail with reference to the embodiments, those skilled in the art should understand that various combinations, modifications, or equivalent substitutions of the technical solutions of the invention do not depart from the spirit and scope of the invention and should be covered within the scope of the claims of the invention.

Claims

1. An explosion-proof junction box for access control, comprising a mounting bracket (1), characterized in that: Two sealing boxes (2) are respectively mounted on the upper ends of the mounting bracket (1). Multiple junction box mechanisms (3) are arranged between the two sealing boxes (2). Buffer telescopic tubes (4) are connected between the junction box mechanisms (3) and between the junction box mechanisms (3) and the sealing boxes (2). A cable outlet tube (5) and a wiring structure (7) are sleeved inside the junction box mechanism (3). A terminal post (6) is clamped and connected in the middle of the wiring structure (7). The two ends of the terminal post (6) are respectively inserted into the interior of the two sealing boxes (2). The wiring structure (7) includes a pressing frame (71). The frame (71) is U-shaped and surrounds the outside of the terminal block (6) on three sides. One end of the pressing frame (71) is connected to a cable (72). The cable (72) is sleeved inside the outlet tube (5). The part of the cable (72) extending into the inside of the pressing frame (71) is fixedly installed with a contact piece (73). The other end of the pressing frame (71) is rotatably connected to a bolt (74). The bolt (74) is threadedly connected to the second connecting tube (33). The junction box mechanism (3) can rotate through the buffer telescopic tube (4). The outlet tube (5) on the junction box mechanism (3) can be flexibly adjusted to multiple directions, up, down, left, and right.

2. The explosion-proof junction box for access control according to claim 1, characterized in that: The mounting bracket (1) includes a mounting plate (11), which has multiple mounting holes (12) in the middle. Both ends of the mounting plate (11) are vertically connected to columns (13). The upper end of the column (13) has a sleeve hole (14). Rollers (15) are installed around the inner wall of the sleeve hole (14). A connecting plate (16) is fixedly installed on the inner side of the column (13). A first spring (17) is fixedly connected between the connecting plate (16) and the sealing box (2).

3. The explosion-proof junction box for access control according to claim 2, characterized in that: The sealing box (2) includes a plug (21), a sleeve (22) is fixedly installed in the middle of the plug (21), the sleeve (22) extends to both ends, the outer part of the sleeve (22) is sleeved in the hole (14), and rollers (15) are installed around the inner wall of the hole (14). The rollers (15) roll against the outer surface of the sleeve (22). A compression spring (24) is fixedly connected inside the sleeve (22). Insertion holes (23) are installed at both the upper and lower ends of the plug (21). A positioning rod (8) is inserted into the insertion hole (23). Both ends of the positioning rod (8) are fixed to the sealing box (2) by self-tightening bolts.

4. The explosion-proof junction box for access control according to claim 1, characterized in that: The junction box mechanism (3) includes a cylindrical box body (31), on which a first connecting pipe (32) and a second connecting pipe (33) are fixedly installed. The first connecting pipe (32) and the second connecting pipe (33) are located on the same axis, and the outlet pipe (5) is sleeved inside the first connecting pipe (32). The wiring structure (7) is connected inside the second connecting pipe (33).

5. The explosion-proof junction box for access control according to claim 1, characterized in that: The buffer expansion tube (4) is a W-shaped corrugated metal tube, and the buffer expansion tube (4) is made of 304 or 316 stainless steel.

6. The explosion-proof junction box for access control according to claim 1, characterized in that: The terminal block (6) is a cube-shaped brass prism.

7. The explosion-proof junction box for access control according to claim 4, characterized in that: The outlet tube (5) includes an insulating sleeve (51), and a second spring (52) is fixedly connected inside the insulating sleeve (51). The second spring (52) is fixedly connected to the inner side of the first connecting tube (32).

8. The explosion-proof junction box for access control according to claim 1, characterized in that: The length and width of the pressing frame (71) are both greater than the diagonal distance of the terminal block (6), and the pressing frame (71) and the bolt (74) are both made of insulating material.

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