A reverse power prevention device for low voltage line

Abstract

The utility model relates to a low -voltage line is with preventing power supply device, relates to low -voltage line technical field, solved the electric shock risk of key contact exposed when operating ground wire, and its upper and lower shell accidental separation's technical problem after long -term locking use, including lower shell and upper shell, the lower shell is seted up with mounting groove, and the both sides of mounting groove are seted up with work groove and fixed groove respectively, and the rotatory seat is rotated in work groove, and the one side of rotatory seat is rotated with first limit piece, and the bottom of first limit piece is connected with second limit piece, and the other side of first limit piece is connected with fixed shaft. The utility model discloses through the ground wire of being connected with containing in mounting groove to the closure of upper shell and lower shell realizes reliable fixing, provides effective encapsulation protection for the connecting point of ground wire and line, significantly reduces the risk of causing connecting point oxidation, corrosion, and further causing short circuit, electrical fault such as firing under the humid weather because of moisture, rainwater invasion.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage line technology, specifically to a low-voltage line anti-reverse power supply device. Background Technology

[0002] Low-voltage lines are power lines with a rated voltage of 1kV and below. Low-voltage lines include low-voltage overhead lines, low-voltage overhead insulated lines, low-voltage cable lines, and indoor distribution lines. They are used to directly transmit electrical energy to low-voltage electrical equipment and are an important component of the low-voltage power distribution system (see Low-voltage Power Distribution).

[0003] When working on low-voltage power distribution equipment, grounding wires must be installed on all sides that may be energized to prevent backfeeding caused by sudden power surges or improper use of backup generators by some users in the line, which could result in injury to workers. Therefore, appropriate backfeeding prevention devices are required.

[0004] After installation, existing anti-backflow power supply devices require the upper and lower housings to be separated before workers can attach temporary grounding wires. However, after the grounding wires are installed, the electrical contacts connecting the conductor terminals to the power distribution line conductors are often directly exposed to the external environment before the device is closed again (the upper and lower housings are closed). This lack of effective insulation or physical isolation means that the continuous exposure of critical electrical connection points may lead to construction in rainy or humid weather. The humidity can easily reduce the air insulation strength, greatly increasing the risk of flashover, creepage, or even direct short circuits between the exposed points and the ground or adjacent conductors.

[0005] Furthermore, when the upper and lower housings are connected, the blocks extending from both sides of the upper housing are embedded in the corresponding limiting grooves of the lower housing. The blocks are temporarily locked in the grooves by relying on the rubber blocks pre-placed inside the limiting grooves. However, under long-term use, the rubber blocks will inevitably age, harden, crack, and undergo permanent compression deformation, which reduces the limiting effect of the rubber blocks on the blocks and makes it difficult to meet the strict requirements of power equipment for long-term operational reliability and safety.

[0006] Based on this, the present invention provides a low-voltage line anti-backflow power supply device to solve the above problems. Utility Model Content

[0007] In view of the above situation and to overcome the defects of the prior art, this utility model provides a low-voltage line anti-backflow power supply device. This utility model has a novel structure and ingenious design, which effectively solves the technical problem that existing anti-backflow power supply devices have the risk of electric shock due to exposed key contacts during grounding wire operation, and that their upper and lower shells rely on locking structures made of easily aging rubber parts, which may lead to accidental separation after long-term use.

[0008] A low-voltage line anti-reverse power supply device includes a lower housing, an upper housing, a first lower half ring, a first upper half ring, a second lower half ring, and a second upper half ring. The lower housing has an installation groove. A working groove and a fixing groove are respectively formed on both sides of the installation groove near the upper housing. A rotating seat is rotatably connected within the working groove. A first limiting block is rotatably connected to one side of the rotating seat. A second limiting block is fixedly connected to the bottom of the first limiting block. The first and second limiting blocks cooperate with the installation groove. One side of the second limiting block cooperates with one side of the installation groove to form a circular hole. A fixing shaft is fixedly connected to the other side of the first limiting block. The fixing shaft cooperates with the fixing groove and is fixed in the fixing groove by fixing bolts.

[0009] Preferably, an adjustment groove is provided on one side of the mounting groove, a clamping plate is slidably connected in the adjustment groove, two second springs are provided between the clamping plate and the adjustment groove, an insertion groove is provided on the side of the second limiting block near the adjustment groove, the adjustment groove and the insertion groove cooperate, and the clamping plate cooperates with the second limiting block.

[0010] Preferably, an insertion assembly is fixedly connected to both sides of the lower housing. The insertion assembly includes a support block, which is fixedly connected to one side of the lower housing. A limiting groove is formed on the top of the support block, and a fixing frame is fixedly connected to one side of the support block. A first sliding groove is formed on one side of the limiting groove, and the first sliding groove is connected to the fixing frame. A wedge block is slidably connected in the first sliding groove.

[0011] Preferably, a sliding plate is slidably connected inside the fixed frame, the wedge block is fixedly connected to one side of the sliding plate, a first spring is provided between the sliding plate and the inner wall of the fixed frame, a slider is fixedly connected to one side of the sliding plate, a second sliding groove is opened on one side of the fixed frame, the slider is slidably connected in the second sliding groove, and two blocks are fixedly connected to both sides of the upper housing. The two blocks are respectively engaged with two limiting grooves, and the two limiting grooves are limited by the wedge block to stop the blocks.

[0012] Preferably, a rotating frame is fixedly connected to one side of the first lower half ring and the first upper half ring, and the lower housing and the upper housing are rotatably connected to the two rotating frames respectively. The first upper half ring and the first lower half ring are hinged to each other. Limiting rods are fixedly connected to the other side of the lower housing and the upper housing. The second lower half ring and the second upper half ring are hinged to each other. Limiting seats are fixedly connected to one side of the second lower half ring and the second upper half ring respectively. The two limiting rods cooperate with the two limiting seats respectively.

[0013] Preferably, one side of the first lower half ring and the second lower half ring are fixedly connected with buckles, and one side of the first upper half ring and the second upper half ring are fixedly connected with hooks, and the two buckles are respectively engaged with the two hooks.

[0014] The present invention has the following technical effects.

[0015] 1. This utility model, through the mounting groove, rotating seat, first limiting block and second limiting block, can conveniently accommodate the grounding wire to be connected in the mounting groove, and achieve reliable fixation through the closure of the upper shell and the lower shell, providing effective encapsulation protection for the connection point of the grounding wire and the line, significantly reducing the risk of oxidation and corrosion of the connection point due to moisture and rainwater intrusion in rainy and humid weather, which may lead to electrical faults such as short circuits and arcing.

[0016] 2. This utility model achieves adaptive clamping and limiting fixation for grounding wires of different diameters through adjusting groove, clamping plate, second spring and insertion groove. Under the action of the second spring, the clamping plate can automatically adjust the clamping force according to the thickness of the grounding wire placed in the installation groove, effectively suppressing the shaking of the grounding wire caused by external force during use, and fundamentally avoiding the problems of loose connection points, increased contact resistance, heat generation or even eventual detachment caused by shaking.

[0017] 3. This utility model enables the lower and upper shells to be conveniently and securely connected and locked through the synergistic action of the support block, the first spring, the wedge block and the stop block. At the same time, the unlocking operation is simple and intuitive, effectively preventing the shells from being accidentally opened due to external force or vibration. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0019] Figure 1 This is a three-dimensional exploded structural diagram of the present invention;

[0020] Figure 2 This is a three-dimensional structural schematic diagram of the present invention;

[0021] Figure 3 This is a structural schematic diagram of the assembly of the lower shell and the upper shell of this utility model;

[0022] Figure 4 This is a schematic diagram of the assembly of the mounting groove, rotating seat, first limiting block and second limiting block of this utility model;

[0023] Figure 5 This is a utility model Figure 3 Enlarged structural diagram at point A in the middle;

[0024] Figure 6 This is a structural schematic diagram of the assembly of the support block, fixing frame and wedge block of this utility model.

[0025] Reference numerals: 1-Lower housing; 2-Upper housing; 3-First lower half ring; 4-First upper half ring; 5-Second lower half ring; 6-Second upper half ring; 7-Snap fastener; 8-Hook; 9-Rotating frame; 10-Insertion assembly; 101-Support block; 102-Limiting groove; 103-Fixing frame; 104-First sliding groove; 105-Wedge block; 106-Sliding plate; 107-First spring; 108-Second sliding groove; 109-Slider; 11-Stop block; 12-Mounting groove; 13-Working groove; 14-Rotating seat; 15-First limiting block; 16-Second limiting block; 17-Insertion groove; 18-Fixing shaft; 19-Fixing groove; 20-Adjusting groove; 21-Pressure plate; 22-Second spring; 23-Limiting rod; 24-Limiting seat. Detailed Implementation

[0026] The foregoing and other technical contents, features and effects of this utility model are described in conjunction with the appendix below. Figures 1 to 6 The detailed description of the embodiments will make this clear. All references to the following embodiments are made with reference to the accompanying drawings.

[0027] Exemplary embodiments of the present invention will now be described with reference to the accompanying drawings.

[0028] This utility model is a low-voltage line anti-backflow power supply device. In existing devices, before the temporary grounding wire is connected and the connection is closed again, the conductor connection terminals are in an exposed state without insulation. In rainy and humid environments, the ambient moisture will significantly reduce the air insulation strength, which can easily lead to flashover, creepage or even short circuit accidents between the exposed point and the ground or adjacent conductors.

[0029] The upper housing 2 and the lower housing 1 rely on the rubber block to lock the stop 11 in the limiting groove 102 to achieve closure. After long-term use, the rubber block will inevitably age, harden, crack and permanently deform, resulting in loss of limiting effect and unreliable locking, which seriously threatens the long-term operational safety and structural reliability of the device.

[0030] As one embodiment, this utility model includes a lower housing 1, an upper housing 2, a first lower half ring 3, a first upper half ring 4, a second lower half ring 5, and a second upper half ring 6. The lower housing 1 has a mounting groove 12, which is arc-shaped overall, with one side being semi-circular and matching the shape of the lower housing 1. The top is open to facilitate the insertion of a grounding wire. Working grooves 13 and fixing grooves 19 are respectively formed on both sides of the mounting groove 12 near the upper housing 2. Both working grooves 13 and fixing grooves 19 are rectangular. A rotating seat 14 is rotatably connected within the working groove 13. The rotating seat 14 is cylindrical and rotates through the shafts at both ends. The first limiting block 15 is rotatably connected to one side of the rotating seat 14, which is installed in the working groove 13. The bottom of the first limiting block 15 is fixedly connected to the second limiting block 16. The first limiting block 15 is rectangular and the second limiting block 16 is arc-shaped. The overall shape formed by the two after they are combined perfectly matches the inner contour of the mounting groove 12. One side of the second limiting block 16 is matched with one side of the mounting groove 12 to form a circular hole. The other side of the first limiting block 15 is fixedly connected to the fixing shaft 18. The fixing shaft 18 is cylindrical and has a fixing hole. The fixing shaft 18 is matched with the fixing groove 19 and is fixed in the fixing groove 19 by fixing bolts.

[0031] In this embodiment, when the grounding wire needs to be installed, the fixing bolts are first removed from the fixing groove 19. The second limiting block 16 is rotated, causing the first limiting block 15 to rotate synchronously on the rotating seat 14. This causes the first limiting block 15 and the second limiting block 16 to rotate and move out of the mounting groove 12. After the first limiting block 15 and the second limiting block 16 have completely moved out of the mounting groove 12, the rotating seat 14 is pushed laterally, allowing the fixing shaft 18 on one side of the first limiting block 15 to move out of the fixing groove 19, thereby freeing up space in the mounting groove 12. After the grounding wire is installed on the line, it is pushed into the mounting groove 12. The grounding wire slides in the mounting groove 12 and finally abuts against the arc-shaped sidewall of the mounting groove 12. The grounding wire is then placed... After insertion, push the rotating seat 14 back to its original position, causing the fixed shaft 18 and the limiting block to move, so that the first limiting block 15 enters the mounting groove 12 first, and then rotate the second limiting block 16 (or apply force to make the two limiting blocks rotate together), causing the first limiting block 15 to rotate in the opposite direction on the rotating seat 14, so that the first limiting block 15 and the second limiting block 16 rotate back synchronously and completely enter the mounting groove 12, limiting the inserted grounding wire. After the first limiting block 15 and the second limiting block 16 enter the mounting groove 12, the fixed shaft 18 is located in the fixed groove 19. Insert the fixing bolt into the fixed groove 19 to fix the fixed shaft 18, thereby fixing the first limiting block 15 and the second limiting block 16.

[0032] As one embodiment, an adjustment groove 20 is provided on one side of the mounting groove 12. The adjustment groove 20 is arc-shaped, and a pressing plate 21 is slidably connected inside the adjustment groove 20. The pressing plate 21 is also arc-shaped and slides against the inner wall of the adjustment groove 20. Two second springs 22 are provided between the pressing plate 21 and the adjustment groove 20. An insertion groove 17 is provided on the side of the second limiting block 16 near the adjustment groove 20. The insertion groove 17 is also arc-shaped and has the same shape as the adjustment groove 20. It is coaxially engaged with the adjustment groove 20. The adjustment groove 20 engages with the insertion groove 17, and the pressing plate 21 engages with the second limiting block 16.

[0033] In this embodiment, when the second limiting block 16 is pushed into / rotated into the mounting groove 12, the second limiting block 16 and the mounting groove 12 cooperate to form a space for accommodating the grounding wire. When the grounding wire is placed in this space, the grounding wire will press against the clamping plate 21, forcing the clamping plate 21 to slide and retract into the adjusting groove 20, thereby squeezing the second spring 22. After the second spring 22 is compressed, it generates elastic force, which pushes the clamping plate 21 to press the grounding wire, thereby limiting and fixing the grounding wire. It can accommodate grounding wires of different thicknesses. When not in use (without the grounding wire installed), the second spring 22 pushes the clamping plate 21 to slide in the adjusting groove 20, so that it enters the insertion groove 17 located in the second limiting block 16. In this way, the clamping plate 21 closes the (cable installation) space formed by the second limiting block 16 and the mounting groove 12, and together with the upper housing 2 and the lower housing 1, it forms a snap-fit ​​space to protect the (internal) wiring.

[0034] Even better, sealing strips are affixed to the edges of the clamping plate 21 and the insertion slot 17.

[0035] As one embodiment, insertion components 10 are fixedly connected to both sides of the lower housing 1. Each insertion component 10 includes a support block 101, which is rectangular and fixedly connected to one side of the lower housing 1. A limiting groove 102 is formed at the top of the support block 101; the limiting groove 102 is arched. A fixing frame 103 is fixedly connected to one side of the support block 101. A first sliding groove 104 is formed on one side of the limiting groove 102; the first sliding groove 104 is rectangular and communicates with the fixing frame 103. A wedge block 105 is slidably connected within the first sliding groove 104, sliding against it. A sliding plate 106 is slidably connected within the fixing frame 103. A first spring 107 is provided between the sliding plate 106 and the inner wall of the fixed frame 103. A slider 109 is fixedly connected to one side of the sliding plate 106. A second slide groove 108 is provided on one side of the fixed frame 103. The slider 109 is square and the second slide groove 108 is elongated. The top and bottom of the slider 109 slide against the top and bottom of the second slide groove 108, respectively. The slider 109 is slidably connected in the second slide groove 108. Both sides of the upper housing 2 are fixedly connected with a stop block 11. Both stop blocks 11 are arched and cooperate with two limiting grooves 102. Both limiting grooves 102 limit the stop block 11 by a wedge block 105.

[0036] In this embodiment, when the upper housing 2 is placed on top of the lower housing 1, the stop blocks 11 on both sides of the upper housing 2 are respectively inserted into the limiting grooves 102 on the two support blocks 101. When the stop block 11 enters the limiting groove 102, it pushes the wedge block 105, causing the wedge block 105 to slide and retract in the first sliding groove 104. The movement of the wedge block 105 pushes the sliding plate 106 in the fixed frame 103 to move, thereby compressing the first spring 107. After the stop block 11 is fully inserted into the limiting groove 102, the wedge block 105 is no longer pushed by the stop block 11, but only by the elastic force released by the compressed first spring 107. This elastic force pushes the wedge block 105 to slide in the opposite direction in the first sliding groove 104, so that its end extends into the limiting groove 102, blocking and limiting the entry of the stop block 11, thereby connecting the upper housing 2 and the lower housing 1 together.

[0037] As one embodiment, a rotating frame 9 is fixedly connected to one side of the first lower half ring 3 and the first upper half ring 4. The lower housing 1 and the upper housing 2 are rotatably connected to the two rotating frames 9 respectively. The first lower half ring 3 and the first upper half ring 4 are both semicircular and fit together to form a cylindrical shape. The first upper half ring 4 is hinged to the first lower half ring 3. Limiting rods 23 are fixedly connected to the other side of the lower housing 1 and the upper housing 2. The second lower half ring 5 and the second upper half ring 6 are hinged to each other. The second lower half ring 5 and the second upper half ring 6 are both semicircular and fit together to form a cylindrical shape. Limiting seats 24 are fixedly connected to one side of the second lower half ring 5 and the second upper half ring 6 respectively. The two limiting rods 23 respectively cooperate with the two limiting seats 24. Hooks 7 are fixedly connected to one side of the first lower half ring 3 and the second lower half ring 5. Hooks 8 are fixedly connected to one side of the first upper half ring 4 and the second upper half ring 6 respectively. The two hooks 7 cooperate with the two hooks 8 respectively.

[0038] In this embodiment, during installation, the insulation layer of the circuit is first peeled off, and tinned copper foil is wrapped around the exposed conductor. Then, sealing tape is wrapped around both ends of the tinned copper foil wrapping section for sealing, and a layer of waterproof tape is wrapped on the sealing tape. Next, the first lower half ring 3, the first upper half ring 4, the second lower half ring 5, and the second upper half ring 6 are installed at the positions where the waterproof tape is wrapped at both ends. The buckle 7 of the first lower half ring 3 is hooked onto the hook 8 of the first upper half ring 4, and the buckle 7 of the second lower half ring 5 is hooked onto the hook 8 of the second upper half ring 6, thereby fixing this set of clamps composed of half rings on the line. After that, the lower housing 1 and the upper housing 2 are put on the outside of the clamp, closed and rotated to make the lower housing 1 and the upper housing 2 fit together to form a cylindrical structure. During this process (or after closing), the limiting rod 23 located on one side of the lower housing 1 and the upper housing 2 will be inserted into the limiting seat 24 installed on the second lower half ring 5 and the second upper half ring 6 to achieve limiting and fixing of the housing. The installation is then completed.

[0039] Working principle of this utility model:

[0040] Strip the insulation layer of the circuit to expose the conductor, wrap tinned copper foil around the exposed conductor, seal the two ends of the tinned copper foil section with sealing tape, and then wrap a layer of waterproof tape on the sealing tape. At the positions where waterproof tape is wrapped at both ends, install a cylindrical structure (one end) composed of the first lower half ring 3 and the first upper half ring 4 and a cylindrical structure (the other end) composed of the second lower half ring 5 and the second upper half ring 6 respectively. Place the upper shell 2 on top of the lower shell 1, close and rotate the upper shell 2 and the lower shell 1 to form a cylindrical structure.

[0041] During this process, the blocks 11 on both sides of the upper housing 2 are inserted into the limiting grooves 102 on the support blocks 101 on both sides of the lower housing 1. The entry of the blocks 11 pushes the wedge block 105 to slide and compress the spring. When the blocks 11 are fully in place, the spring force pushes the wedge block 105 to extend and lock the blocks 11, thereby locking the upper and lower housings 1 into a whole.

[0042] At this point, the overall device consisting of the first upper half ring 4, the first lower half ring 3, the second upper half ring 6, the second lower half ring 5, the lower shell 1, and the upper shell 2 is fixed at the point where the insulation layer has been peeled off.

[0043] The present invention has the following technical effects.

[0044] 1. This utility model, through the mounting groove 12, rotating seat 14, first limiting block 15 and second limiting block 16, can conveniently accommodate the grounding wire to be connected in the mounting groove 12, and achieve reliable fixation through the closure of the upper shell 2 and the lower shell 1, providing effective encapsulation protection for the connection point of the grounding wire and the line, significantly reducing the risk of oxidation and corrosion of the connection point due to moisture and rainwater intrusion in rainy and humid weather, which may lead to electrical faults such as short circuits and arcing.

[0045] 2. This utility model achieves adaptive clamping and limiting fixation for grounding wires of different diameters through adjusting groove 20, clamping plate 21, second spring 22 and insertion groove 17. Under the action of second spring 22, clamping plate 21 can automatically adjust the clamping force according to the thickness of the grounding wire placed in the installation groove 12, effectively suppressing the shaking of the grounding wire caused by external force during use, and fundamentally avoiding the problems of loose connection points, increased contact resistance, heat generation and even eventual detachment caused by shaking.

[0046] 3. Through the coordinated action of the support block 101, the first spring 107, the wedge block 105 and the stop block 11, the lower shell 1 and the upper shell 2 can be conveniently and securely connected and locked. At the same time, the unlocking operation is also simple and intuitive, effectively preventing the shell from being accidentally opened due to external force or vibration.

[0047] Although the present invention has been described in detail through the above preferred embodiments, it should be understood that the above description should not be considered as a limitation of the present invention. Various modifications and substitutions to the present invention will be obvious to those skilled in the art after reading the above content. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims

1. A low-voltage line anti-reverse power supply device, comprising a lower housing (1), an upper housing (2), a first lower half-ring (3), a first upper half-ring (4), a second lower half-ring (5), and a second upper half-ring (6), characterized in that, The lower housing (1) is provided with an installation groove (12). The installation groove (12) is provided with a working groove (13) and a fixing groove (19) on both sides near the upper housing (2). A rotating seat (14) is rotatably connected in the working groove (13). A first limiting block (15) is rotatably connected to one side of the rotating seat (14). A second limiting block (16) is fixedly connected to the bottom of the first limiting block (15). The first limiting block (15) and the second limiting block (16) cooperate with the installation groove (12). One side of the second limiting block (16) cooperates with one side of the installation groove (12) to form a circular hole. A fixing shaft (18) is fixedly connected to the other side of the first limiting block (15). The fixing shaft (18) cooperates with the fixing groove (19). The fixing shaft (18) is fixed in the fixing groove (19) by fixing bolts.

2. The reverse connection preventing power supply device for low voltage line according to claim 1, wherein An adjustment groove (20) is provided on one side of the mounting groove (12). A pressure plate (21) is slidably connected in the adjustment groove (20). Two second springs (22) are provided between the pressure plate (21) and the adjustment groove (20). An insertion groove (17) is provided on the side of the second limiting block (16) near the adjustment groove (20). The adjustment groove (20) and the insertion groove (17) cooperate with each other. The pressure plate (21) and the second limiting block (16) cooperate with each other.

3. The reverse connection preventing power supply device for low voltage line according to claim 1, wherein The lower housing (1) is fixedly connected to both sides of an insertion assembly (10). The insertion assembly (10) includes a support block (101). The support block (101) is fixedly connected to one side of the lower housing (1). A limiting groove (102) is opened on the top of the support block (101). A fixing frame (103) is fixedly connected to one side of the support block (101). A first sliding groove (104) is opened on one side of the limiting groove (102). The first sliding groove (104) is connected to the fixing frame (103). A wedge block (105) is slidably connected in the first sliding groove (104).

4. The reverse connection preventing power supply device for low voltage line according to claim 3, wherein A sliding plate (106) is slidably connected inside the fixed frame (103). A wedge block (105) is fixedly connected to one side of the sliding plate (106). A first spring (107) is provided between the sliding plate (106) and the inner wall of the fixed frame (103). A slider (109) is fixedly connected to one side of the sliding plate (106). A second slide groove (108) is opened on one side of the fixed frame (103). The slider (109) is slidably connected in the second slide groove (108). Both sides of the upper housing (2) are fixedly connected to a stop block (11). The two stop blocks (11) are respectively engaged with two limiting grooves (102). The two limiting grooves (102) limit the stop block (11) through the wedge block (105).

5. The reverse connection preventing power supply device for low voltage line according to claim 1, wherein A rotating frame (9) is fixedly connected to one side of the first lower half ring (3) and the first upper half ring (4). The lower housing (1) and the upper housing (2) are rotatably connected to the two rotating frames (9). The first upper half ring (4) is hinged to the first lower half ring (3). Limiting rods (23) are fixedly connected to the other side of the lower housing (1) and the upper housing (2). The second lower half ring (5) and the second upper half ring (6) are hinged to each other. Limiting seats (24) are fixedly connected to one side of the second lower half ring (5) and the second upper half ring (6). The two limiting rods (23) cooperate with the two limiting seats (24) respectively.

6. The reverse connection preventing power supply device for low voltage line according to claim 1, wherein One side of the first lower half ring (3) and the second lower half ring (5) are fixedly connected with buckles (7), and one side of the first upper half ring (4) and the second upper half ring (6) are fixedly connected with hooks (8). The two buckles (7) are respectively engaged with the two hooks (8).

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