An explosion-proof control box

Abstract

The application belongs to the technical field of distribution box, and particularly relates to an anti-explosion control box, which comprises an anti-explosion box, a wiring mechanism is installed at the bottom of the anti-explosion box, the wiring mechanism comprises a fixing cylinder which is fixedly installed at the bottom of the anti-explosion box, a plurality of sealing block groups are filled in the fixing cylinder, each sealing block group comprises two mutually adhered sealing blocks, a through groove is formed in each sealing block, a guide rod is arranged in the through groove, vertical grooves are formed in the side walls of the fixing cylinder on the two sides of the guide rod, a sliding rod is slidably arranged in each vertical groove, a missing groove is formed in the side of each sliding rod which is opposite to the other, a first clamping block is slidably arranged in the missing groove through a spring, through grooves are formed in the outer sides of the fixing cylinder on the two sides of the vertical grooves, and vertical rods are arranged on the opposite sides of the two sliding rods.

Description

Technical Field

[0001] This invention belongs to the field of distribution box technology, specifically an explosion-proof control box. Background Technology

[0002] Explosion-proof control boxes are core electrical devices used for power distribution control, signal transmission, and equipment protection in explosive hazardous locations such as petroleum, chemical, metallurgical, and coal mines where flammable and explosive gases or dust exist. They isolate internal electrical components from the external hazardous environment through an explosion-proof enclosed shell, blocking the contact path between ignition sources and explosive media, and are fundamental equipment for ensuring the safe operation of electrical systems in hazardous locations. The cable entry point is a critical weak point in the integrity of the explosion-proof shell, requiring it to simultaneously meet multiple functions such as cable insertion, mechanical locking, medium sealing, and explosion-proof flame extinguishing. Its structural reliability directly determines the overall safety performance of the explosion-proof control box.

[0003] The cable entry system of existing explosion-proof control boxes generally adopts a structure of explosion-proof gland head combined with cylindrical elastic seal: the gland head body is assembled into the cable entry hole of the box through a threaded structure, the cylindrical seal is housed inside, and a screw-on compression nut is set at the end. During installation and wiring, after the cable is passed through the gland head and the cylindrical seal, the compression nut is tightened to push it axially, applying a continuous axial compression force to the cylindrical seal, forcing the seal to expand and deform radially, tightly gripping the outer sheath of the cable inward and tightly adhering to the inner wall of the qualified gland outward, thereby filling the annular gap between the cable and the gland head, simultaneously achieving axial anti-loosening locking of the cable and sealing isolation at the cable entry point, together with the threaded explosion-proof pair of the gland head, forming a complete explosion-proof barrier for the cable entry point.

[0004] However, in practical industrial applications, many explosion-proof control boxes need to be installed in environments with continuous mechanical vibration, such as pumps, conveyor units, and vibrating screens. Under long-term alternating vibration loads, the threaded fit between the clamping nut and the gland body will gradually loosen, and the axial clamping force will continuously decrease with operating time. When the vibration intensity is high or the duration is long, the loosening of the clamping nut will continue to intensify, and it may even completely unscrew and fall off the gland body, completely losing its axial constraint and compression effect on the cylindrical seal.

[0005] When the clamping nut loosens or falls off, the cylindrical elastic seal loses axial pressure and rebounds elastically, its radial expansion disappears, and a new through-hole annular gap is formed between its inner wall and the cable outer sheath, and between its outer wall and the inner wall of the gland. External explosive gases, ultrafine combustible dust, and corrosive media can continuously seep into the enclosure along this annular gap, gradually transforming the originally safe chamber into an explosive hazardous environment. Ignition sources such as electric arcs generated by the operation of internal electrical components and terminal overheating will directly cause an explosion risk. Summary of the Invention

[0006] To overcome the shortcomings of existing technologies and solve the aforementioned technical problems, this invention proposes an explosion-proof control box. By setting up a wiring mechanism, it can avoid the hidden danger of the sealing block losing its compressive force and forming a through-ring gap between the sealing block and the cable and the inner wall of the fixed cylinder due to the loosening of the clamping components; the specific structure is as follows; An explosion-proof control box includes an explosion-proof box; a wiring mechanism is installed at the bottom of the explosion-proof box. The wiring mechanism includes a fixed cylinder, which is fixedly installed at the bottom of the explosion-proof box, with the top of the fixed cylinder extending into the interior of the explosion-proof box and the bottom of the fixed cylinder extending below the explosion-proof box. The fixed cylinder is filled with multiple sealing block groups that fit together vertically, with the uppermost sealing block group extending above the fixed cylinder and the lowermost sealing block group having a distance between it and the bottom of the fixed cylinder. Each of the sealing block groups includes two sealing blocks that fit together, and the sealing blocks are made of rubber material; the sealing blocks that fit together are semi-circular, with grooves on opposite sides; Each sealing block has a through groove, and the through grooves of the upper and lower sealing blocks correspond to each other; a guide rod is provided in the through groove, and the top of the guide rod extends to the top of the uppermost sealing block, and the bottom extends to the middle of the lowermost sealing block, and the guide rod is interference-fitted with the through groove. The guide rod has vertical grooves on both sides located in the side wall of the fixed cylinder; A sliding rod is slidable within the vertical groove, and its top and bottom extend to the top and bottom of the fixed cylinder, respectively. Both sliding rods have notches on opposite sides, and a first locking block slides in the notch via a spring; in the initial state, the first locking block is located in the notch; through slots are provided on both sides of the vertical groove outside the fixed cylinder, and the through slots are located at the bottom of the explosion-proof box and aligned with the notch. The two sliding rods are provided with uprights on opposite sides, and sliders slide on the uprights, with the sliders in contact with the top of the uppermost sealing block assembly; a spring is sleeved on the uprights, and the spring is located below the slider; The slide bar is mounted on the slider; the guide rod passes through the slider and is slidably connected to the slider; the guide rod is connected to the upright rod via a connecting assembly; A locking assembly is installed at the bottom of the fixed cylinder.

[0007] In a preferred embodiment of the present invention, the locking assembly includes an octagonal nut; the fixing cylinder is threaded on one side of the bottom of the explosion-proof box, and the octagonal nut is engaged on the thread; An L-shaped plate is installed at the bottom of the octagonal nut, and the L-shaped plate is staggered with the two sliding rods, with the bottom horizontal part of the L-shaped plate lower than the sliding rods; The inner ring of the fixed cylinder is also threaded, and the thread of the inner ring of the fixed cylinder is opposite to that of the inner ring of the fixed cylinder; the bottom of the fixed cylinder is connected to a threaded cylinder with the inner thread of the fixed cylinder, and the thread of the outer ring of the threaded cylinder is opposite to that of the inner ring of the octagonal nut. An octagonal cylinder is fixed to the bottom of the threaded cylinder; a connecting plate is fixed to the bottom of the octagonal cylinder; slots are provided on the horizontal part of the bottom of the connecting plate and the L-shaped plate, and after the connecting plate is aligned with the slot on the L-shaped plate, it is connected by inserting the first insert shaft into the slot.

[0008] In a preferred embodiment of the present invention, the bottom of the octagonal nut is fixed with a sliding cylinder, and the L-shaped plates slide within the corresponding sliding cylinders, and the L-shaped plates cannot slide out of the sliding cylinders.

[0009] In a preferred embodiment of the present invention, a semi-ring plate is fixed to the top of each sealing block; the semi-ring block has a through hole aligned with the through groove.

[0010] In a preferred embodiment of the present invention, two insert rods are fixed to the side of one of the semi-ring plates; and an insertion hole is opened on the side of the other semi-ring plate, and the insert rod is inserted into the insertion hole.

[0011] In a preferred embodiment of the present invention, the bottom of the two sliding rods is provided with sliding holes, and an extension rod slides within the sliding holes; The outer ring of the top of the extension rod is threaded; the inner ring of the top of the sliding hole is also threaded.

[0012] In a preferred embodiment of the present invention, the two notches are also provided with uniformly arranged notches above the slide bar; A second block slides through a spring in the notch above the first block, and the second block is restricted within the notch by a vertical groove.

[0013] In a preferred embodiment of the present invention, the slide bar passes through the slider; a through hole is provided on the side of the slider, and a through hole is also provided on the slide bar; a crossbar is inserted into the through holes of the slider and the slide bar; The crossbar is fitted with second insert shafts on both sides; The connecting assembly includes a rectangular clamping plate; both the guide rod and the upright rod have rectangular slots, and the rectangular clamping plate is inserted into the rectangular slots of both the guide rod and the upright rod. Both the guide rod and the top of the upright are threaded with locking bolts.

[0014] In a preferred embodiment of the present invention, a sealing layer is installed on the inner ring of the vertical groove.

[0015] The beneficial effects of this invention are as follows: 1. The explosion-proof control box of the present invention, through the mutual cooperation of octagonal nuts, L-shaped plates, connecting plates, octagonal cylinders and threaded cylinders, can avoid the hidden danger of the sealing block losing its compressive force due to the loosening of the clamping components, and the formation of a through-ring gap between the sealing block and the cable and the inner wall of the fixed cylinder. It blocks the path of external explosive gases, ultrafine combustible dust and corrosive media to seep into the box body along the gap, prevents the safe chamber inside the box from turning into an explosive hazardous environment, and improves the operational safety and sealing reliability of the explosion-proof control box under vibration conditions.

[0016] 2. The explosion-proof control box of the present invention addresses the problem that the bottom sealing block assembly is in direct contact with external combustible dust and corrosive media, making it prone to aging, shrinkage, and failure. This structure allows the bottom sealing block assembly to be pushed down as a whole, so that the failed sealing block assembly can be directly removed from the bottom of the guide rod. Replacement can be completed without removing the cable from the electrical components inside the box or inserting the seal from the cable end. This solves the defects of existing gland heads and cylindrical seals, which require disconnecting the cable, have a cumbersome operation process, and have long downtime when replacing them, effectively reducing the difficulty of operation and maintenance and maintenance costs.

[0017] 3. The explosion-proof control box of the present invention, through the design of detachable slider, crossbar and rectangular plate connection, and combined with the structure of detachable sealing block group, can complete the replenishment of sealing block group and replacement of failed seals from inside the box without disassembling the cable or disconnecting the cable from the electrical components inside the box. It does not require shutting down the entire explosion-proof control box and powering it off, nor does it require disassembling the overall wiring mechanism and external wiring, thus reducing the downtime for seal maintenance. Attached Figure Description

[0018] The invention will now be further described with reference to the accompanying drawings.

[0019] Figure 1 This is a perspective view of the explosion-proof box of the present invention; Figure 2 This is a diagram of the internal structure of the explosion-proof box of this invention; Figure 3 This is a structural diagram of the wiring mechanism of the present invention; Figure 4 This is a diagram showing the disassembled structure of the wiring mechanism of the present invention; Figure 5 This is a diagram of the internal structure of the fixed cylinder in this invention; Figure 6 This is a structural diagram of the octagonal nut, L-shaped plate, threaded cylinder, and octagonal cylinder in this invention; Figure 7 This is a structural diagram of the sealing block in this invention; Figure 8 This is a top view of the wiring mechanism of the present invention installed inside an explosion-proof box; Figure 9This is the present invention. Figure 8 Sectional view at point AA; Figure 10 This is the present invention. Figure 8 Enlarged view of a section at point B in the middle; Figure 11 This is the present invention. Figure 8 Enlarged view of a section at point C; Figure 12 This is the present invention. Figure 8 Enlarged view of a section at point D.

[0020] In the diagram: 1. Explosion-proof box; 11. Fixed cylinder; 12. Sealing block; 13. Through slot; 14. Guide rod; 15. Semi-ring plate; 16. Insert rod; 17. Insertion hole; 18. Cable; 2. Vertical slot; 21. Sliding rod; 22. First locking block; 23. Through slot; 24. Extension rod; 25. Second locking block; 3. Vertical rod; 31. Sliding block; 32. Through hole; 33. Horizontal bar; 34. Second insert shaft; 35. Rectangular locking plate; 36. Rectangular slot; 37. Locking bolt; 4. Octagonal nut; 41. L-shaped plate; 42. Sliding cylinder; 43. Threaded cylinder; 44. Octagonal cylinder; 45. Connecting plate; 46. First insert shaft. Detailed Implementation

[0021] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0022] like Figures 1 to 12 As shown, the explosion-proof control box of the present invention includes an explosion-proof box 1; a wiring mechanism is installed at the bottom of the explosion-proof box 1; The wiring mechanism includes a fixed cylinder 11, which is fixedly installed at the bottom of the explosion-proof box 1, with the top of the fixed cylinder 11 extending into the interior of the explosion-proof box 1 and the bottom of the fixed cylinder 11 extending below the explosion-proof box 1. The fixed cylinder 11 is filled with multiple sealing block groups that fit together vertically, with the uppermost sealing block group extending above the fixed cylinder 11 and the lowermost sealing block group having a distance between it and the bottom of the fixed cylinder 11. Each of the sealing block groups includes two sealing blocks 12 that fit together, and the sealing blocks 12 are made of rubber material; the sealing blocks 12 that fit together are semi-circular, and have grooves on opposite sides; Each sealing block 12 is provided with a through groove 13, and the through grooves 13 of the upper and lower sealing blocks 12 correspond to each other; a guide rod 14 is provided in the through groove 13, and the top of the guide rod 14 extends to the top of the uppermost sealing block 12, and the bottom extends to the middle of the lowermost sealing block 12, and the guide rod 14 and the through groove 13 are interference fit. The guide rod 14 has vertical grooves 2 on both sides located in the side wall of the fixed cylinder 11; A sliding rod 21 is slidably installed in the vertical groove 2, and its top and bottom extend to the top and bottom of the fixed cylinder 11. Both sliding rods 21 have notches on opposite sides, and a first locking block 22 slides in the notch via a spring; in the initial state, the first locking block 22 is located in the notch; the vertical groove 2 has through grooves 23 on both sides outside the fixed cylinder 11, and the through grooves 23 are located at the bottom of the explosion-proof box 1 and aligned with the notch. The two sliding rods 21 are provided with upright rods 3 on opposite sides, and sliders 31 slide on the upright rods 3, and the sliders 31 are in contact with the top of the uppermost sealing block assembly; a spring is sleeved on the upright rods 3, and the spring is located below the sliders 31. The slide bar 21 is mounted on the slider 31; the guide rod 14 passes through the slider 31 and is slidably connected to the slider 31; the guide rod 14 is connected to the upright rod 3 via a connecting assembly. A locking assembly is installed at the bottom of the fixed cylinder 11; In this embodiment, the locking assembly includes an octagonal nut 4; the fixing cylinder 11 is threaded on one side of the bottom of the explosion-proof box 1, and the octagonal nut 4 is engaged on the thread; An L-shaped plate 41 is installed at the bottom of the octagonal nut 4, and the L-shaped plate 41 is staggered with the two slide rods 21, and the horizontal part of the bottom of the L-shaped plate 41 is lower than the slide rods 21; The inner ring of the fixed cylinder 11 is also threaded, and the thread of the inner ring of the fixed cylinder 11 is opposite to the thread of the inner ring of the fixed cylinder 11; the bottom of the fixed cylinder 11 is connected to the threaded cylinder 43 in the inner thread of the fixed cylinder 11, and the thread of the outer ring of the threaded cylinder 43 is opposite to the thread of the inner ring of the octagonal nut 4. An octagonal cylinder 44 is fixed to the bottom of the threaded cylinder 43; a connecting plate 45 is fixed to the bottom of the octagonal cylinder 44; slots are provided on the horizontal part of the bottom of the connecting plate 45 and the L-shaped plate 41, and after the connecting plate 45 and the slot on the L-shaped plate 41 are aligned, they are connected by inserting the first insert shaft 46 into the slot. In this embodiment, the bottom of the octagonal nut 4 is fixed with a slide cylinder 42, and the L-shaped plates 41 slide within the corresponding slide cylinder 42, and the L-shaped plates 41 cannot slide out of the slide cylinder 42.

[0023] In practice, when using the explosion-proof control box, first install the explosion-proof box 1 in a suitable position, complete the wiring of the internal electrical components of the explosion-proof box 1, and then perform the introduction of the external cable 18. First, pull the first insert shaft 46 out of the slot aligned on the L-shaped plate 41 and the connecting plate 45 to disconnect the connection between the octagonal nut 4 and the octagonal cylinder 44. Since the external thread of the outer ring of the fixed cylinder 11 and the internal thread of the inner ring of the fixed cylinder 11 have opposite rotation directions, the octagonal nut 4 engages with the outer ring thread of the fixed cylinder 11, and the threaded cylinder 43 engages with the inner ring thread of the fixed cylinder 11. The rotation directions of the threads that fit the two are opposite. Therefore, rotate the octagonal cylinder 44 and the threaded cylinder 43 clockwise. When the threaded cylinder 43 is turned out, the threaded cylinder 43 will gradually turn downward along the inner thread of the fixed cylinder 11; after the threaded cylinder 43 has completely turned out from the inside of the fixed cylinder 11, the cable 18 to be connected is inserted from the bottom of the octagonal cylinder 44, passes through the inner cavity of the octagonal cylinder 44 and the inner cavity of the threaded cylinder 43 in sequence, and then enters the inside of the fixed cylinder 11 from the bottom opening; the cable 18 passes through multiple sets of upper and lower sealing block groups from bottom to top in the fixed cylinder 11, is embedded in the wire groove between two relatively close sealing blocks 12 in each set of sealing blocks 12, and finally passes out from the top of the uppermost sealing block group, enters the explosion-proof box 1 and completes the connection with the electrical components inside the box; Specifically, after the cable 18 is connected, both sliders 31 are pressed down simultaneously. The sliders 31 slide down along the upright 3, synchronously driving the slide rod 21 and the uppermost sealing block assembly to move down along the guide rod 14. At the same time, the sliders 31 compress the spring sleeved on the upright 3. During the downward movement of the slide rod 21, it slides down along the vertical groove 2 on the side wall of the fixed cylinder 11, driving the first locking block 22 in the notch of the slide rod 21 to move down synchronously. When the first locking block 22 moves down with the slide rod 21 to a position below the lower end face of the octagonal nut 4, the spring in the notch releases its elastic force, pushing the first locking block 22 out of the notch and into the through groove 23. At this time, the pressure on the slider 31 is released, and the spring on the upright rod 3 rebounds upward, pushing the slider 31. The slider 31 drives the sliding rod 21 and the first locking block 22 to move upward, so that the upper end face of the first locking block 22 abuts against the lower end face of the octagonal nut 4, forming a locking limit, which restricts the sliding rod 21 and the slider 31 from rebounding to reset. Thus, the slider 31 forms a pre-tightening constraint on multiple groups of sealing blocks from top to bottom. During this process, the guide rod 14 passes through the through groove 13 of each sealing block 12 and is interference-fitted with the through groove 13, providing guidance for the up and down movement of the sealing block 12 and ensuring that multiple groups of sealing blocks always remain coaxially aligned. More specifically, after the pre-tightening limit is completed, the top of the threaded cylinder 43 is aligned with the inner ring opening at the bottom of the fixed cylinder 11. The octagonal cylinder 44 and the threaded cylinder 43 are rotated counterclockwise, so that the threaded cylinder 43 is gradually screwed upward into the fixed cylinder 11 along the inner ring thread. The top of the threaded cylinder 43 gradually moves upward and fits against the bottom of the lowest sealing block group. The octagonal cylinder 44 is rotated counterclockwise, and the threaded cylinder 43 continues to move upward, applying an axial compressive force from bottom to top to the multiple sets of sealing block groups stacked above. Since the slider 31 has formed an upper limit by engaging with the octagonal nut 4 through the first locking block 22, the axial compressive force of the threaded cylinder 43 will cause the sealing blocks 12 in each set of sealing blocks to be compressed and undergo radial expansion deformation. The sealing blocks 12 contract inward to hug the outer sheath of the cable 18 and expand outward to fit tightly against the inner ring wall of the fixed cylinder 11, filling the annular gap between the cable 18 and the inner wall of the fixed cylinder 11, forming a multi-point sealing and locking structure at the corresponding positions of the multiple sets of sealing block groups. Furthermore, during the rotation of the octagonal cylinder 44 and the threaded cylinder 43, the L-shaped plate 41 can be pushed upwards, allowing the L-shaped plate 41 to slide upwards along the slide cylinder 42 to accommodate the height change of the octagonal cylinder 44 after the threaded cylinder 43 is screwed into the fixed cylinder 11. After the threaded cylinder 43 presses against the sealing block 12 and forms a stable seal in the fixed cylinder 11, the octagonal cylinder 44 is rotated to adjust its circumferential position, so that the slots on the bottom connecting plate 45 of the octagonal cylinder 44 are aligned with the slots on the bottom horizontal part of the L-shaped plate 41. Then, the first insert shaft 46 is inserted into the aligned slots to achieve circumferential fixation of the octagonal nut 4 and the octagonal cylinder 44, so that the two form a synchronously rotating linkage. At this point, the cable 18 wiring operation is completed. Furthermore, if the vibration causes the octagonal nut 4 to loosen counterclockwise, the octagonal nut 4 will move downward along the outer thread of the fixed cylinder 11 when it rotates counterclockwise; the first locking block 22 is located on the lower end face of the octagonal nut 4 and abuts against it, which can directly block the downward displacement of the octagonal nut 4 and suppress its loosening tendency; if the vibration intensity is large, the octagonal nut 4 will move downward and push the first locking block 22 downward synchronously. The first locking block 22 drives the slide rod 21 and the slider 31 to move downward synchronously. The slider 31 further squeezes the uppermost sealing block group, increases the axial compression of the sealing block 12, and increases the radial expansion of the sealing block 12. The tightness of the fit with the cable 18 and the inner wall of the fixed cylinder 11 is increased synchronously, realizing the self-compensation effect of the greater the loosening amount and the stronger the sealing pressure, avoiding small loosening from causing sealing gaps; Meanwhile, since the octagonal nut 4 and the octagonal cylinder 44 are circumferentially linked through the first insert shaft 46, and the threads of the two are opposite in direction, the loosening tendency can be mutually restrained: if the octagonal nut 4 is subjected to vibration and has a counterclockwise loosening tendency, it will drive the octagonal cylinder 44 and the threaded cylinder 43 to rotate counterclockwise synchronously through the L-shaped plate 41, the first insert shaft 46, and the connecting plate 45; and the counterclockwise rotation of the threaded cylinder 43 is the tightening direction, which will further screw into the fixed cylinder 11, increasing the pressure on the sealing block 12 from below; conversely, if the threaded cylinder 43 is subjected to vibration and has a clockwise loosening tendency, it will drive the octagonal nut 4 to rotate clockwise synchronously; and the clockwise rotation of the octagonal nut 4 is the tightening direction, and the upper end face of the octagonal nut 4 is in contact with the bottom of the explosion-proof box 1 and cannot move further upward, thus directly locking the loosening tendency of the threaded cylinder 43; the two restrain each other, which can effectively prevent the octagonal nut 4 or the threaded cylinder 43 from loosening and falling off under vibration environment; Therefore, through the cooperation of the octagonal nut 4, L-shaped plate 41, connecting plate 45, octagonal cylinder 44 and threaded cylinder 43, the hidden danger of the sealing block 12 losing its compressive force due to the loosening of the clamping components and forming a through annular gap between the sealing block 12 and the inner wall of the cable 18 and the fixed cylinder 11 can be avoided. This blocks the path of external explosive gases, ultrafine combustible dust and corrosive media to seep into the box body along the gap, prevents the safe chamber inside the box from turning into an explosive hazardous environment, and improves the operational safety and sealing reliability of the explosion-proof control box under vibration conditions.

[0024] As an embodiment of the present invention, a semi-ring plate 15 is fixed to the top of each sealing block 12; a through hole aligned with the through groove 13 is provided on the semi-ring block; In this embodiment, two insert rods 16 are fixed to the side of one of the semi-ring plates 15; the other semi-ring plate 15 has an insertion hole 17 on its side, and the insert rods 16 are inserted into the insertion hole 17.

[0025] During implementation, a semi-ring plate 15 is fixed to the top of each sealing block 12. During the process of the threaded cylinder 43 being screwed into the fixed cylinder 11 and applying axial compressive force to multiple sets of sealing blocks 12, the upper and lower adjacent sealing blocks 12 transmit the compressive force through the semi-ring plate 15. As a rigid support structure, the semi-ring plate 15 can form a uniform and flat support and compression on the end face of the elastic sealing block 12, avoiding local depression and stress dispersion on the end face of the sealing block 12 when it is compressed. This allows the axial compressive force on the sealing block 12 to be fully converted into radial expansion deformation, thereby better shrinking inward to tightly hug the outer sheath of the cable 18 and expanding outward to tightly fit the inner ring wall of the fixed cylinder 11. Meanwhile, in the two semi-ring plates 15 corresponding to the two sealing blocks 12 that fit together in the same group, one semi-ring plate 15 has two insert rods 16 fixed on its side, and the other semi-ring plate 15 has an insertion hole 17 on its corresponding side. During assembly, the insert rods 16 are inserted into the insertion hole 17, so that the two relatively fitted sealing blocks 12 form a lateral and circumferential positioning constraint. When the sealing block 12 moves downward along the guide rod 14 or is deformed by axial compression, the insertion of the insert rods 16 and the insertion hole 17 can limit the relative displacement between the two sealing blocks 12, so that the sealing blocks 12 that fit together move downward synchronously and always maintain a fitted and aligned state.

[0026] As an embodiment of the present invention, the bottom of the two sliding rods 21 are provided with sliding holes, and an extension rod 24 slides in the sliding holes; The outer ring of the top of the extension rod 24 is threaded; the inner ring of the top of the sliding hole is also threaded. In this embodiment, the two notches are also provided with evenly arranged notches above the slide bar 21; A second block 25 slides in the notch above the first block 22 via a spring, and the second block 25 is restricted in the notch by the vertical groove 2.

[0027] During implementation, each of the two sliding rods 21 has a sliding hole at its bottom, and an extension rod 24 is slidably installed inside the sliding hole. After the explosion-proof control box completes the wiring and sealing of the cable 18, the extension rod 24 is rotated so that the external thread at the top of the extension rod 24 disengages from the internal thread at the top of the sliding hole. The extension rod 24 slides downward along the sliding hole under its own weight, and is not completely slid out of the sliding hole due to the structural constraint of the sliding hole. At this time, the rod body of the extension rod 24 extends downward out of the sliding hole and is located between two adjacent L-shaped plates 41, forming a physical block on the circumferential rotation of the L-shaped plates 41. Specifically, since the octagonal cylinder 44 and the threaded cylinder 43 are hollow structures, the bottom surface of the sealing block assembly located at the bottom will be in direct contact with the external environment. Under long-term use, they are prone to aging and shrinkage. At the same time, the sealing block assembly at the bottom will be in direct contact with flammable dust or corrosive media, which is also prone to damage and failure. When the existing structure using gland head and cylindrical seal has such problems, the cable 18 must first be removed from the electrical components, then the old cylindrical seal must be removed from the end of the cable 18, and finally the new cylindrical seal must be put on the cable 18 to complete the replacement. The operation process is cumbersome. More specifically, when replacing the sealing block assembly that comes into contact with the outside world in this wiring mechanism, firstly, pull the first insert shaft 46 out of the slot aligned on the L-shaped plate 41 and the connecting plate 45 to release the linkage between the octagonal nut 4 and the octagonal cylinder 44; then rotate the octagonal cylinder 44 and the threaded cylinder 43 clockwise, so that the threaded cylinder 43 gradually screws downward along the thread of the inner ring of the fixed cylinder 11, completing the disassembly of the threaded cylinder 43; then open the door of the explosion-proof box 1, and simultaneously press down on the two sliders 31 from inside the box. The two sliders 31 drive the slide rod 21 and the uppermost sealing block assembly along the guide... As rod 14 continues to move downward, slide rod 21 moves downward, causing the second locking block 25 in the upper notch to move downward synchronously. When the second locking block 25 moves to a position below the lower end face of the octagonal nut 4, it is no longer constrained by the inner wall of the vertical groove 2. The spring in the notch releases its elastic force, pushing the second locking block 25 outward from the inside of the notch. At this time, the pressing force on slider 31 is released, and the upper end face of the second locking block 25 will abut against the lower end face of the octagonal nut 4, forming a new locking limit, so that slide rod 21 and slider 31 are kept in the position after moving downward, without the need to continuously apply pressing force. More specifically, as the slider 31 pushes multiple sets of sealing blocks down along the guide rod 14, the sealing block set that was originally at the bottom will fall off from the bottom of the guide rod 14 and detach from the internal cavity of the fixed cylinder 11. At this time, the two sealing blocks 12 that are in contact with each other can be directly removed from the cable 18 to complete the removal of the failed sealing block 12. After installing the new sealing block set, the reverse operation is performed to reset, and the sealing replacement can be completed. The entire process does not require the cable 18 to be removed from the electrical components inside the explosion-proof box 1. Furthermore, addressing the issue that the bottom sealing block assembly is in direct contact with external combustible dust and corrosive media, making it prone to aging, shrinkage, and failure, this structure can push the sealing block assembly downwards as a whole, allowing the failed bottom sealing block assembly to be directly detached and removed from the bottom of the guide rod 14. This eliminates the need to remove the cable 18 from the electrical components inside the box or to insert the seal from the end of the cable 18 for replacement. This solves the shortcomings of existing gland heads and cylindrical seals, which require the removal of the cable 18, resulting in cumbersome procedures and long downtime. It effectively reduces the difficulty of operation and maintenance and maintenance costs.

[0028] As an embodiment of the present invention; the slide bar 21 passes through the slider 31; the slider 31 has a through hole 32 on its side, and the slide bar 21 also has a through hole 32; a crossbar 33 is inserted into the through hole 32 of the slider 31 and the slide bar 21; The crossbar 33 is provided with second insert shafts 34 on both sides; The connecting assembly includes a rectangular clamping plate 35; both the guide rod 14 and the upright rod 3 are provided with rectangular slots 36, and the rectangular clamping plate 35 is inserted into the rectangular slots 36 of both the guide rod 14 and the upright rod 3. Both the top of the guide rod 14 and the upright rod 3 are threaded with locking bolts 37; In this embodiment, a sealing layer is installed on the inner ring of the vertical groove 2.

[0029] During implementation, since the sliding rod 21 passes through the inside of the slider 31, and the slider 31 has a through hole 32 on its side, the corresponding position on the sliding rod 21 also has a through hole 32. When the sliding rod 21 and the slider 31 are adjusted to the preset position and the two sets of through holes 32 are aligned with each other, the crossbar 33 is inserted into the through hole 32 of the slider 31 and the sliding rod 21 that are aligned with each other, so as to realize the lateral connection and fixation of the slider 31 and the sliding rod 21. The two sides of the crossbar 33 are provided with second insert shafts 34, which can form an axial limit on the crossbar 33 to prevent the crossbar 33 from slipping out of the through hole 32 of the slider 31 and the sliding rod 21 during equipment vibration or operation, so as to ensure that the connection and fixation state of the slider 31 and the sliding rod 21 is stable and reliable. Since the inner ring of the vertical groove 2 is equipped with a sealing layer, the sealing layer is attached to the outer surface of the sliding rod 21, which can form a sealing barrier between the sliding rod 21 and the vertical groove 2, preventing external smoke, dust and other media from entering the explosion-proof box 1 through the gap of the vertical groove 2. Specifically, when it is necessary to add sealing block groups to the fixed cylinder 11, after all the original sealing block groups have slid into the fixed cylinder 11, first open the door of the explosion-proof box 1; then rotate the locking bolt 37 so that the locking bolt 37 is turned upwards, no longer forming a squeezing and fixing effect on the rectangular clamping plate 35; then pull the rectangular clamping plate 35 out of the rectangular groove 36 of the upright 3 and the rectangular groove 36 of the guide rod 14 at the same time, releasing the connection constraint between the guide rod 14 and the upright 3; then pull the second insert shaft 34 out from both sides of the crossbar 33 to release the axial limit of the crossbar 33, and then pull the crossbar 33 out from the through hole 32 of the slider 31 and the slide rod 21 to release the lateral fixation between the slider 31 and the slide rod 21; then slide the slider 31 upwards along the upright 3, the guide rod 14 and the slide rod 21, so that the slider 31 is completely separated from the upright 3, the slide rod 21 and the guide rod 14, and moved out of the upper area of ​​the fixed cylinder 11; More specifically, the second locking block 25 is then manually pressed back into the notch to release the locking limit between the second locking block 25 and the octagonal nut 4. Then, the slide rod 21 is pushed upward to slide upward along the vertical groove 2 back to its initial position. Next, the new sealing blocks 12 are placed in pairs to insert the insertion rod 16 on the corresponding half-ring plate 15 into the insertion hole 17 of the other half-ring plate 15, thus completing the assembly of a single sealing block group. Then, the guide rod 14 is inserted into the through groove 13 of the sealing block group, and the sealing block group is pushed downward along the guide rod 14 until it is in contact with the top surface of the sealing block group below, thus completing the replenishment of the sealing block group. Furthermore, after the sealing block 12 is replenished, the slider 31 is once again fitted onto the upright 3, the slide rod 21, and the guide rod 14. The position is adjusted so that the through hole 32 of the slider 31 and the slide rod 21 are aligned with each other. The crossbar 33 is inserted, and the second insert shaft 34 is inserted on both sides of the crossbar 33 to fix the slide rod 21 inside the slider 31. Then, the rectangular clamping plate 35 is inserted into the rectangular groove 36 of the upright 3 and the guide rod 14 at the same time to connect the upright 3 and the guide rod 14 and fix the position of the guide rod 14. Finally, the locking bolt 37 is tightened to lock and fix the rectangular clamping plate 35. After the structure is reset, the equipment can continue to be put into use. Furthermore, through the detachable slider 31, crossbar 33 and rectangular card plate 35 connection design, combined with the detachable sealing block assembly structure, the sealing block assembly can be replenished and the failed seals replaced from inside the box without disassembling the cable 18 or removing the cable 18 from the electrical components inside the box. This eliminates the need to shut down the entire explosion-proof control box and disconnect the power, as well as the need to disassemble the overall wiring mechanism and external wiring, thus reducing the downtime for seal maintenance.

[0030] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the appendix. Figure 1 The orientations or positional relationships shown are for the convenience of describing the present invention and simplifying the description only, and are not intended to 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, they should not be construed as limiting the scope of protection of the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and should not be construed as indicating or implying relative importance.

[0031] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An explosion-proof control box, comprising an explosion-proof box (1); characterized in that, The explosion-proof box (1) is equipped with a wiring mechanism at the bottom; The wiring mechanism includes a fixed cylinder (11), which is fixedly installed at the bottom of the explosion-proof box (1); The fixed cylinder (11) is filled with multiple sealing block groups that fit together vertically, with the uppermost sealing block group extending above the fixed cylinder (11) and the lowermost sealing block group having a distance from the bottom of the fixed cylinder (11). Each of the sealing block groups includes two sealing blocks (12) that fit together; the sealing blocks (12) that fit together are semi-circular and have grooves on opposite sides; Each of the sealing blocks (12) is provided with a through groove (13); a guide rod (14) is provided in the through groove (13), and the top of the guide rod (14) extends to the top of the uppermost sealing block (12), and the bottom extends to the middle of the lowermost sealing block (12); Vertical grooves (2) are provided on both sides of the guide rod (14) in the side wall of the fixed cylinder (11); A slide rod (21) slides in the vertical groove (2), and its top and bottom extend to the top and bottom of the fixed cylinder (11); Both sliding rods (21) have notches on opposite sides, and a first locking block (22) slides in the notch via a spring; the vertical groove (2) has through grooves (23) on both sides outside the fixed cylinder (11), and the through grooves (23) are located at the bottom of the explosion-proof box (1) and aligned with the notches; The two sliding rods (21) are provided with uprights (3) on opposite sides, and sliders (31) slide on the uprights (3); springs are sleeved on the uprights (3), and the springs are located below the sliders (31); The slide bar (21) is mounted on the slider (31); the guide rod (14) passes through the slider (31) and is slidably connected to the slider (31); the guide rod (14) is connected to the upright (3) via a connecting assembly; A locking assembly is installed at the bottom of the fixed cylinder (11).

2. The explosion-proof control box according to claim 1, characterized in that: The locking assembly includes an octagonal nut (4); the fixing cylinder (11) is threaded on one side of the bottom of the explosion-proof box (1), and the octagonal nut (4) is engaged on the thread; The bottom of the octagonal nut (4) is fitted with an L-shaped plate (41); The inner ring of the fixed cylinder (11) is also threaded, and the thread of the inner ring of the fixed cylinder (11) is opposite to the thread of the inner ring of the fixed cylinder (11); the bottom of the fixed cylinder (11) is connected to the threaded cylinder (43) inside the fixed cylinder (11), and the thread of the outer ring of the threaded cylinder (43) is opposite to the thread of the inner ring of the octagonal nut (4). An octagonal tube (44) is fixed to the bottom of the threaded cylinder (43); a connecting plate (45) is fixed to the bottom of the octagonal tube (44); slots are provided on the horizontal part of the bottom of the connecting plate (45) and the L-shaped plate (41), and after the connecting plate (45) and the slot on the L-shaped plate (41) are aligned, they are connected by inserting the first insert shaft (46) into the slot.

3. The explosion-proof control box according to claim 2, characterized in that: The bottom of the octagonal nut (4) is fixed with a slide cylinder (42), and the L-shaped plates (41) slide inside the opposite slide cylinder (42), and the L-shaped plates (41) cannot slide out of the slide cylinder (42).

4. The explosion-proof control box according to claim 3, characterized in that: Each of the sealing blocks (12) is fixed with a semi-ring plate (15) on top; the semi-ring block is provided with a through hole aligned with the through groove (13).

5. The explosion-proof control box according to claim 4, characterized in that: Two insert rods (16) are fixed to the side of one of the semi-ring plates (15); the other semi-ring plate (15) has an insertion hole (17) on its side, and the insert rod (16) is inserted into the insertion hole (17).

6. The explosion-proof control box according to claim 5, characterized in that: The bottom of the two slide rods (21) is provided with sliding holes, and an extension rod (24) slides in the sliding holes; The outer ring of the top of the extension rod (24) is threaded; the inner ring of the top of the sliding hole is also threaded.

7. The explosion-proof control box according to claim 6, characterized in that: The two notches above the slide bar (21) are also provided with evenly arranged notches; A second block (25) slides in the notch above the first block (22) via a spring, and the second block (25) is restricted in the notch by the vertical groove (2).

8. The explosion-proof control box according to claim 7, characterized in that: The slide bar (21) passes through the slider (31); the slider (31) has a through hole (32) on its side, and the slide bar (21) also has a through hole (32); a crossbar (33) is inserted into the through hole (32) of the slider (31) and the slide bar (21); The crossbar (33) is provided with second insert shafts (34) on both sides; The connecting assembly includes a rectangular card plate (35); both the guide rod (14) and the upright rod (3) are provided with rectangular slots (36), and the rectangular card plate (35) is inserted into the rectangular slots (36) of both the guide rod (14) and the upright rod (3); Both the guide rod (14) and the upright rod (3) have locking bolts (37) threaded onto their tops.

9. The explosion-proof control box according to claim 1, characterized in that: A sealing layer is installed on the inner ring of the vertical groove (2).

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