A cable branch box and a method for monitoring the status thereof

Abstract

The application discloses a cable branch box and a state monitoring method thereof. The cable branch box comprises a box body, a door frame and a box door. The door frame is provided with a clamping column, a clamping head and a release block. The release block is provided with a first guide surface and a second guide surface. The clamping head is provided with a release slot facing the second guide surface. The box door is elastically connected with a clamping block. The clamping block is provided with a guide inclined surface facing the clamping head. The clamping block is clamped in the inner side of the clamping head, the box door is closed and locked, the box door continues to move in the closing direction, the clamping block moves and passes the release head, and the box door is unlocked. The state monitoring method of the cable branch box comprises the following steps: S1, collecting the electric parameters and the position of the box door of the cable branch box; S2, determining the current state of the box door; and S3, determining the current state of the cable branch box. The box door can be temporarily locked, and the cable branch box is convenient to detect and maintain.

Description

Technical Field

[0001] This invention belongs to the field of power transmission and distribution technology, specifically, it relates to a cable branch box and its status monitoring method. Background Technology

[0002] A cable distribution box is a device used in power transmission and distribution systems to branch, distribute, and control cables. Its main function is to divide a main cable into multiple branch cables to supply power to different electrical equipment or areas. Cable distribution boxes are widely used in urban power distribution networks, industrial power distribution systems, and building electrical systems.

[0003] Cable distribution boxes mainly consist of an external enclosure and internal power transmission and distribution equipment. The enclosure has a door, which, when closed and locked, isolates the power transmission and distribution equipment from the outside world, reducing the impact of external forces on the equipment and ensuring the safety of the power transmission and distribution process. When it is necessary to inspect or maintain the power transmission and distribution equipment inside the enclosure, simply unlock and open the door.

[0004] However, during long-term testing and maintenance, operators often need to temporarily leave the enclosure. If the enclosure door is simply closed without being locked, it can easily be opened by external forces or by unauthorized personnel, which may damage the power transmission and distribution equipment or cause a safety accident. If the enclosure door is both closed and locked, it will be inconvenient to unlock it again when it is reopened. Summary of the Invention

[0005] Existing cable distribution boxes require the door to be closed and locked every time the user leaves, in order to reduce the impact of external forces on the internal power transmission and distribution equipment and to prevent safety accidents. This is inconvenient. To solve this problem, the following invention is proposed: A cable branch box includes a box body with a fixed door frame on the box body. A door is movably connected to the box body on the outside of the door frame. A locking post is provided on the door frame, and a locking head is fixedly provided on the locking post. A release block is movably sleeved on the locking post between the locking head and the door frame. The release block has a first guide surface on the side away from the locking head. The locking head has a release groove facing the other side of the release block. A locking block is elastically connected to the door, and a guide slope facing the locking head is provided on the locking block.

[0006] When the cabinet door is closed, the locking block engages inside the locking head to prevent the cabinet door from being opened. As the cabinet door continues to move in the closing direction, the unlocking block abuts against the guide ramp, pushing the locking block to move elastically until it passes the unlocking head and abuts against the first guide surface. Then, when the cabinet door is opened, the unlocking head moves due to the abutment of the locking block until it is inserted into the unlocking slot. Subsequently, the locking block can move elastically along the first guide surface until it passes the unlocking head and the locking head, and the cabinet door is opened.

[0007] Furthermore, the door is provided with an installation groove for inserting the locking pin and locking head. The installation groove has at least one guide groove that is connected to it. The locking block is horizontally elastically connected to the guide groove. When the guide slope is resisted, it pushes the locking block to move horizontally elastically into the guide groove.

[0008] Furthermore, each of the guide grooves is provided with two guide plates extending from the two side walls respectively, and a guide port for inserting the locking block into the mounting groove is provided between the two guide plates. The locking block is also provided with a limiting plate to prevent it from disengaging from the guide groove.

[0009] Furthermore, the card release block has a second guide surface on the side near the card engaging head. The second guide surface faces the card release groove and matches its shape. After the card release block is inserted into the card release groove, the two form an integrated structure.

[0010] Furthermore, both the first and second guide surfaces are frustum surfaces, the unlocking groove is a frustum-shaped groove that matches the second guide surface, the engaging head is hemispherical facing the guide slope, and both the guide plate and the limiting plate are arc-shaped. The engaging block can normally abut against the first guide surface, the second guide surface, and the engaging head regardless of the angle at which they come into contact.

[0011] Furthermore, a spring insert is provided in the guide groove, and a spring insertion hole is provided on the engaging block for inserting the spring insert. A first spring is provided between the engaging block and the guide groove, with one end sleeved on the spring insert and the other end abutting against the spring insertion hole, so as to elastically connect the engaging block and the guide groove.

[0012] Furthermore, a second spring that elastically abuts against the door frame and the unlocking block is provided, and a third spring that elastically abuts against the unlocking block and the engaging head is provided, with both the second and third springs sleeved on the engaging post.

[0013] Furthermore, the door frame and the unblocking slot are respectively provided with ring slots for the insertion of one end of the second spring and the third spring. The unblocking block is also provided with a ring baffle that abuts against the other end of the second spring and the third spring, so that the unblocking block is elastically abutted against the locking post.

[0014] Furthermore, the mounting base is also provided with a cover plate that is fixedly connected to it by a fastener. The cover plate is provided with a sealing block that fits into the opening of the guide groove to isolate the guide groove from the outside.

[0015] The present invention also proposes a method for monitoring the status of a cable branch box, specifically, the following steps are performed sequentially in the cable branch box: Step S1, collecting electrical parameters of the cable branch box during operation and monitoring the position of the box door relative to the door frame; Step S2, determining the current status of the box door based on its position; Step S3, determining the current status of the cable branch box based on the current electrical parameters.

[0016] This invention proposes a cable branch box and its status monitoring method. The cable branch box has the advantage of having a locking block and a locking post on its door and door frame, respectively. The locking post has a locking head and a releasing block. When the door is closed, the locking block engages inside the locking head to temporarily lock the door, preventing it from opening outwards. This allows the operator to temporarily leave the box. By pushing the door again in the closing direction, the locking block will first collide with the releasing block, then move past the releasing block, and subsequently... As the cable distribution box door moves in the opening direction, the locking block pushes the unlocking block into the unlocking slot on the locking head. Finally, the locking block can directly pass over the unlocking block and the locking head, thus unlocking the box door and allowing it to open outwards, which is quite convenient. The beneficial effect of the status monitoring method is that it only needs to monitor and collect the electrical parameters of the cable distribution box and the position of the box door to determine the current status of the cable distribution box. Considering that the box door moves towards the door frame during the opening process, it also makes the judgment of the status of the cable distribution box more precise and accurate. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the box in this invention; Figure 2 This is a partial front view of the box structure in this invention; Figure 3 This is a top view of the locking post and mounting base in this invention; Figure 4 This is a three-dimensional structural diagram of the locking column and mounting base in this invention; Figure 5 This is a schematic diagram of the internal structure of the locking column and mounting base in this invention. Figure 1 ; Figure 6 This is a schematic diagram of the internal structure of the locking column and mounting base in this invention. Figure 2 ; Figure 7 This is a schematic diagram of the internal structure of the locking column and mounting base in this invention. Figure 3 ; Figure 8 This is a schematic diagram showing the disassembled structure of the mounting base and cover plate in this invention; Figure 9 This is a three-dimensional structural diagram of the locking column in this invention; Figure 10 This is a three-dimensional structural diagram of the card-unlocking block in this invention; Figure 11 This is a flowchart of the state monitoring method in this invention.

[0018] The correspondence between the labels and component names in the attached figures is as follows: 1. Box body; 2. Box door; 3. Engaging post; 4. Mounting groove; 5. Engaging block; 6. Cover plate; 11. Door frame; 21. Mounting base; 31. Engaging head; 32. Unengaging block; 33. First guide surface; 34. Second guide surface; 35. Unengaging groove; 36. Second spring; 37. Third spring; 38. Ring baffle; 39. Ring slot; 41. Guide groove; 42. Guide plate; 43. Guide opening; 44. Spring insert post; 45. Fixing hole; 51. Guide slope; 52. Limiting plate; 53. Spring insertion hole; 54. First spring; 61. Fixing component; 62. Sealing block. Detailed Implementation

[0019] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments.

[0020] Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this application.

[0021] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate for the embodiments of this application described herein.

[0022] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing the invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0023] In addition to indicating location or positional relationship, some of the terms mentioned above may also have other meanings. For example, the term "above" may also be used in some cases to indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this invention according to the specific circumstances.

[0024] like Figures 1-2 As shown, this is a preferred embodiment of the present invention, a cable branch box, including a box body 1, a door frame 11, and a box door 2. The door frame 11 is fixedly installed inside the box body 1. There are two boxes 2, which are rotatably connected to the left and right sides of the box body 1 respectively. The box door 2 is located outside the door frame 11. A door lock is also provided on the right box door 2. The box door 2 can be rotated inward to close or rotated outward to open.

[0025] like Figures 2-7 As shown, in this embodiment, two locking posts 3 are provided at the top and bottom of the door frame 11, and a mounting seat 21 is provided at the top and bottom of each door 2. The mounting seat 21 is provided with a mounting groove 4 into which the locking post 3 is inserted after the door 2 is closed. A locking head 31 is fixedly provided at the end of each locking post 3. A release block 32 is provided between the locking head 31 and the door frame 11 and is movably sleeved on the locking post 3. A first guide surface 33 is provided on one side of the release block 32 and a second guide surface 34 is provided on the other side. A release groove 35 is provided on one side of the locking head 31 facing the second guide surface 34 and matching it. A guide groove 41 is provided on the left and right sides of each mounting groove 4 and communicates with it. A locking block 5 is horizontally elastically connected in each guide groove 41. A guide slope 51 facing the other side of the locking head 31 is also provided on the locking block 5.

[0026] When the door 2 is rotated inward to close, the door 2 drives the mounting groove 4 to rotate together. The engaging pin 3 and engaging head 31 gradually insert into the mounting groove 4. During this process, the engaging head 31 abuts against the guide slope 51, causing the engaging block 5 to move horizontally and elastically into the guide groove 41. Then, as... Figure 5 As shown, the locking block 5 will pass over the locking head 31 and lock inside it to prevent the door 2 from rotating outward and opening. At this time, the door 2 enters a temporary locked state.

[0027] When the cabinet door 2 is in a temporarily locked state, there is still a gap between it and the door frame 11. The cabinet door 2 can continue to rotate in the closing direction. As the cabinet door 2 continues to rotate in the closing direction, the mounting groove 4 and the guide groove 41 also rotate. Subsequently, the engaging block 5 moves towards the disengaging block 32 along with the guide groove 41. The disengaging block 32 will initially move towards the door frame 11 because the second guide surface 34 is abutted by the guide slope 51. Once the disengaging block 32 contacts the door frame 11, it cannot move further. At this time, there is a gap between the first guide surface 33 of the disengaging block 32 and the door frame 11. After the engaging block 5 continues to move towards the disengaging block 32, the engaging block 5 will move horizontally and elastically into the guide groove 41 because the guide slope 51 is abutted by the second guide surface 34, until the engaging block 5 passes the disengaging head and inserts into the gap between itself and the door frame 11. Figure 6 As shown, the locking block 5 will spring back to abut against the first guide surface 33; after this, the door 2 can be rotated outward to open. At this time, the locking block 5, by abutting against the first guide surface 33, drives the unlocking head to move along the locking post 3 toward the locking head 31 until the second guide surface 34 of the unlocking head engages and inserts into the unlocking groove 35. Subsequently, the unlocking block 32 can no longer move. The unlocking block 32, by abutting against the locking block 5 through the first guide surface 33, causes it to move horizontally and elastically toward the guide groove 41 again, as shown. Figure 7 As shown, since the card release block 32 is inserted into the card release slot 35 and forms an integral structure with the card engagement head 31, the card engagement block 5 can only pass directly over the card release head and the card engagement head 31, and finally the door 2 can be smoothly rotated outward and opened.

[0028] In this embodiment, each guide groove 41 is provided with two guide plates 42 extending from the side walls respectively. A guide opening 43 is provided between the two guide plates 42 for the engaging block 5 to be inserted into the mounting groove 4. The engaging block 5 is also provided with a limiting plate 52 to prevent it from disengaging from the guide groove 41. Further, the first guide surface 33 and the second guide surface 34 are both frustum surfaces, the disengagement groove 35 is a frustum-shaped groove that matches the second guide surface 34, the engaging head 31 is hemispherical facing the guide slope 51, and the guide plates 42 and the limiting plate 52 are both arc-shaped. By setting the first guide surface 33 and the second guide surface 34 to frustum shapes and the engaging head 31 to be hemispherical facing the guide slope 51, the engaging block 5 can normally generate a resisting force with the engaging block 5 regardless of the direction from which it contacts the above three surfaces.

[0029] like Figure 8 As shown, in this embodiment, a spring insert 44 is provided in the guide groove 41, and a spring insertion hole 53 is provided on the engaging block 5 for the spring insert 44 to be inserted. A first spring 54 is provided between the engaging block 5 and the guide groove 41, with one end sleeved on the spring insert 44 and the other end abutting against the spring insertion hole 53, so as to horizontally and elastically connect the engaging block 5 to the guide groove 41.

[0030] like Figures 9-10 As shown, further, a second spring 36 is provided on the door frame 11 and the unlocking block 32 to elastically abut against each other, and a third spring 37 is provided between the unlocking block 32 and the engaging head 31 to elastically abut against each other. The second spring 36 and the third spring 37 are both sleeved on the engaging post 3, and the elastic force provided by the two is much weaker than the elastic force provided by the first spring 54. Furthermore, the door frame 11 and the unlocking groove 35 are respectively provided with ring slots 39 for one end of the second spring 36 and the third spring 37 to be inserted into, and the unlocking block 32 is also provided with a ring baffle 38 that abuts against the other end of the second spring 36 and the third spring 37.

[0031] The unlocking block 32 is elastically positioned between the door frame 11 and the engaging head 31. When not being engaged by the engaging block 5, the unlocking block 32 remains in a fixed position. When the engaging block 5 moves towards the door frame 11 by engaging the unlocking block 32, the second spring 36 contracts to its limit. During this process, the second spring 36 does not fully enter the ring slot 39 of the door frame 11, thus increasing the minimum gap between the unlocking block 32 and the door frame 11. When the engaging block 5 moves towards the unlocking groove 35 by engaging the unlocking block 32, the third spring 37 contracts. The card is inserted to its limit and fully into the ring slot 39 of the card release groove 35 to avoid leaving a gap between the card release block 32 and the locking head 31 that would allow the locking block 5 to be inserted. At the same time, due to the large elastic force of the first spring 54 and the counteracting force of the second spring 36, the card release block 32 will not move into the guide groove 41 before the locking block 5 when it moves towards the locking head 31, nor will it move past the locking head 31 towards the door frame 11 before the locking block 5 after it is fully inserted into the card release groove 35. This allows the locking block 5 to disengage from the locking head 31 normally.

[0032] like Figure 8 As shown, in this embodiment, a cover plate 6 is also provided. The cover plate 6 is provided with a fixing member 61 and a sealing block 62. The sealing block 62 is matched with the opening of the guide groove 41. The mounting base is provided with a fixing hole 45. The fixing member 61 is threaded into the fixing hole 45 to fix the cover plate 6 on the mounting base. The sealing block 62 is inserted into the opening of the guide groove 41 to prevent the components inside the guide groove 41 from detaching.

[0033] like Figure 11 As shown, based on the above cable branch box, this invention also proposes a status monitoring method for the cable branch box in the above embodiments. This status monitoring method requires the following steps to be performed sequentially: Step S1: Collect the electrical parameters of the cable branch box and the position of the box door 2.

[0034] By using an electrical parameter acquisition device installed inside the cable branch box at the busbar or cable joint, the electrical parameters involved in the operation of the cable branch box can be collected in real time. Considering the convenience of acquisition, most electrical parameter acquisition devices are voltage transformers or current transformers. Therefore, the electrical parameters that can be collected are voltage, current, and operating power. Among them, the operating power needs to be calculated. The main purpose of collecting electrical parameters is to determine the current electrical state of the cable branch box. Based on the different results, the cable branch box can be divided into two electrical states: energized operation state (high voltage / high current / high power) and de-energized operation state (zero voltage / low current / zero power). A displacement sensor is installed on the mounting base 21 or the door frame 11 to monitor the position of the box door 2 relative to the door frame 11 in real time.

[0035] Step S2: Determine the current state of the door (1) based on its position.

[0036] During a complete opening and closing process, the door 2 has several key positions: locked, unlocked, and open. The locked position is when the door 2 is temporarily locked. This position is a range. Within this range, if the door 2 rotates directly in the opening direction, it will stop rotating after reaching a maximum separation distance from the door frame 11. If the door 2 rotates in the closing direction and approaches the door frame 11, the door 2 is unlocked when the distance between the door 2 and the door frame 11 reaches its minimum. At this time, the door 2 is in the unlocked position, and the door 2 can then be opened outwards. When the distance between the door 2 and the door frame 11 exceeds the maximum separation distance, the door 2 enters the open position. When the door 2 is closed again, the distance between the door 2 and the door frame 11 will gradually decrease. When it decreases to less than the maximum separation distance, the door 2 will re-enter the locked position.

[0037] Under normal circumstances, the opening process of the cable distribution box 2 follows the sequence from the locked position to the unlocked position and then to the open position. If the position sensor detects a missing intermediate position, meaning that the cable distribution box 2 skips the unlocked position and directly enters the open position, it indicates that the cable distribution box has been illegally and forcibly intruded upon, and an alarm should be issued immediately.

[0038] Step S3: Based on the currently collected electrical parameters, determine the current status of the cable branch box.

[0039] When the cable branch box is in a power-off state, as long as the opening process of the box door 2 does not involve the missing intermediate position mentioned in step S2, it can be determined that the opening process of the box door 2 of the cable branch box is normal. If the box door 2 is in the open position for a long time, it is determined that the box door 2 is in a state of being forgotten to be closed. At this time, the cable branch box issues a reminder, and the operator will completely close the box door 2.

[0040] When the cable branch box is in a energized operating state, if the intermediate position mentioned in step S2 is missing, the cable branch box enters a state of illegal and violent intrusion while energized. At this time, the main power supply of the cable branch box should be immediately disconnected to prevent a safety accident. When the door 2 is detected moving towards the door frame 11, it is determined that the cable branch box has entered a state of energized misoperation. An alarm is directly issued to the current operator to prevent him from opening the door 2.

[0041] The innovation of the above-mentioned cable branch box status monitoring method lies in the fact that, compared with the existing cable branch boxes, the cable branch box proposed in this invention adds a process of closing the box door 2 inward during the opening process of the box door 2. That is, the box door 2 must first enter the unlocked position. On the one hand, the process of closing the box door 2 inward is used as a buffer zone to avoid the box door 2 being directly opened while energized. On the other hand, by utilizing the fact that the box door 2 has more than one rotation direction within the buffer zone, the current status of the cable branch box can be determined more specifically. The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A cable branch box, comprising a box body (1), a fixed door frame (11) provided on the box body (1), and a door (2) movably connected to the box body (1) on the outside of the door frame (11), characterized in that: The door frame (11) is provided with a locking post (3), and a locking head (31) is fixedly provided on the locking post (3). A release block (32) is provided between the locking head (31) and the door frame (11) and is movably sleeved on the locking post (3). The release block (32) has a first guide surface (33) on the side away from the locking head (31). The locking head (31) has a release groove (35) facing the other side of the release block (32). The box door (2) is elastically connected with a locking block (5). The locking block (5) has a guide slope (51) facing the locking head (31). When the box door (2) is closed... The locking block (5) engages inside the locking head (31) to prevent the door (2) from being opened. After the door (2) continues to move in the closing direction, the unlocking block (32) will abut against the guide slope (51), pushing the locking block (5) to move elastically until it passes the unlocking head and abuts against the first guide surface (33). Then, when the door (2) is opened, the unlocking head is abutted by the locking block (5) and moves until it is inserted into the unlocking groove (35). Subsequently, the locking block (5) can move elastically along the first guide surface (33) until it passes the unlocking head and the locking head (31), and the door (2) is opened.

2. The cable branch box according to claim 1, characterized in that: The door (2) is provided with an installation groove (4) for inserting the locking pin (3) and the locking head (31). The installation groove (4) is provided with at least one guide groove (41) connected to it. The locking block (5) is horizontally elastically connected to the guide groove (41). After the guide slope (51) is resisted, it pushes the locking block (5) to move horizontally elastically into the guide groove (41).

3. The cable branch box according to claim 2, characterized in that: Each of the guide grooves (41) is provided with two guide plates (42) extending from the two side walls respectively. Between the two guide plates (42) is a guide opening (43) for inserting the locking block (5) into the mounting groove (4). The locking block (5) is also provided with a limiting plate (52) to prevent it from disengaging from the guide groove (41).

4. The cable branch box according to claim 3, characterized in that: The release block (32) has a second guide surface (34) on the side near the locking head (31), the second guide surface (34) facing the release groove (35) and matching its shape.

5. The cable branch box according to claim 4, characterized in that: The first guide surface (33) and the second guide surface (34) are both frustum surfaces. The unlocking groove (35) is a frustum-shaped groove that matches the second guide surface (34). The engaging head (31) is hemispherical facing the guide slope (51). The guide plate (42) and the limiting plate (52) are both arc-shaped.

6. The cable branch box according to claim 3, characterized in that: The guide groove (41) is provided with a spring insert (44), and the locking block (5) is provided with a spring insertion hole (53) for the spring insert (44) to be inserted. Between the locking block (5) and the guide groove (41) is a first spring (54) with one end sleeved on the spring insert (44) and the other end abutting and inserted into the spring insertion hole (53).

7. The cable branch box according to claim 1, characterized in that: A second spring (36) is provided on the door frame (11) and the release block (32) to elastically abut against each other, and a third spring (37) is provided between the release block (32) and the locking head (31) to elastically abut against each other. The second spring (36) and the third spring (37) are both sleeved on the locking post (3).

8. The cable branch box according to claim 7, characterized in that: The door frame (11) and the card release groove (35) are respectively provided with ring slots (39) for inserting one end of the second spring (36) and the third spring (37). The card release block (32) is also provided with a ring baffle (38) that abuts against the other end of the second spring (36) and the third spring (37).

9. The cable branch box according to claim 2, characterized in that: The mounting base is also provided with a cover plate (6) which is fixedly connected to it by a fastener (61), and the cover plate (6) is provided with a sealing block (62) that fits into the opening of the guide groove (41).

10. A method for monitoring the status of a cable branch box, characterized in that: In the cable branch box as described in any one of claims 1-9, the following steps are performed sequentially. Step S1: Real-time acquisition of electrical parameters of the cable branch box during operation, as well as the position of the box door (2) relative to the door frame (11); Step S2: Determine the current state of the box door (2) based on its position; Step S3: Based on the currently collected electrical parameters, determine the current status of the cable branch box.

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