Insulation protection structure for electric energy metering box

Abstract

The application provides an insulation protection structure for an electric energy metering box, and relates to the technical field of electrical equipment. The insulation protection structure comprises a protection mechanism mounted on a wiring terminal, two fixing holes are formed in the top end of the wiring terminal, the protection mechanism comprises a mounting block detachably mounted on the top end of the wiring terminal, two limiting rods vertically mounted on the bottom end of the mounting block and capable of being penetrated into the two fixing holes, a sensing assembly arranged on the bottom wall of a protection groove and capable of detecting the fastening state of a screw, two baffles symmetrically and slidingly arranged at the opening position of the protection groove, and a protection assembly arranged on the mounting block and connected with the sensing assembly and the baffles, a protection groove is formed in the top end of the mounting block and the limiting rod, and a limiting hole for the screw to pass through is formed in the bottom wall of the protection groove. The application is convenient for real-time detection of the fastening state of the screw on the wiring terminal, and can intuitively indicate whether the screw is loose through automatic opening and closing of the baffles, thereby improving the electrical connection reliability and operation safety of the electric energy metering box.

Description

Technical Field

[0001] This invention relates to the field of electrical equipment technology, specifically to an insulating and protective structure for an electricity metering box. Background Technology

[0002] In power systems, electricity metering boxes are critical metering devices, internally using terminal blocks to make electrical connections between cables or conductors. The reliability of these terminal block connections directly affects the accuracy of electricity metering and the operational safety of the power system. Currently, terminal blocks typically use screw crimping to fix conductors, and the tightness of the screws is a core factor in ensuring connection quality.

[0003] In actual operation and maintenance, due to vibrations generated during long-term equipment operation, thermal expansion and contraction caused by changes in ambient temperature, and human factors during installation, the screws on the terminals are prone to loosening. Loose screws can lead to increased contact resistance, causing localized overheating, and in severe cases, may result in equipment burnout, power outages, or even fires. Therefore, effective monitoring and alerting regarding the tightness of the screws is crucial.

[0004] In existing technologies, the following solutions exist for detecting or indicating loose screws: First, visual inspection is used, but this method relies on regular manual inspections, resulting in low efficiency, poor real-time performance, and difficulty in observing concealed wiring terminals. Second, markings are applied to the screws, and looseness is judged by observing whether the marks are misaligned; however, this method is prone to wear and blurring of the marks in vibration environments, leading to insufficient reliability. Third, torque wrenches are used for periodic inspections, but this requires power outages, affecting power supply continuity, and is costly. Fourth, a simple spring-loaded clamping device is used, but its complex structure makes it difficult to visually distinguish between "tightened" and "loose" states, easily leading to misjudgments.

[0005] Therefore, how to provide a protective device that can intuitively and reliably indicate the tightness of terminal screws without affecting normal wiring operations is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0006] To address the above problems, the present invention provides an insulating protective structure for an electricity metering box.

[0007] To achieve the above objectives, the present invention provides the following technical solution: an insulating protective structure for an electricity metering box, comprising a protective mechanism installed on a terminal block, wherein a plurality of terminal blocks are installed inside the electricity metering box, and two fixing holes are opened at the top of the terminal blocks; the protective mechanism comprises a mounting block detachably installed on the top of the terminal blocks, two limiting rods vertically installed on the bottom of the mounting block and capable of passing through the two fixing holes, a sensing component disposed on the bottom wall of the protective groove and for detecting the tightness of screws, two partitions symmetrically slidably disposed at the opening of the protective groove, and a protective component disposed on the mounting block and connecting the sensing component and the partitions; a protective groove is opened at the top of the mounting block and inside the limiting rods, and a limiting hole for screws to pass through is opened on the bottom wall of the protective groove;

[0008] When the screw is inserted into the limiting hole and is in a tightened state, the sensing component triggers the protective component to control the two partitions to move away from each other, opening the protective groove opening and reminding the staff that the screw is in a normal state; when the screw is inserted into the limiting hole and is in a loose state, the sensing component triggers the protective component to control the two partitions to move closer to each other, closing the protective groove opening and reminding the staff that the screw is loose.

[0009] Preferably, the sensing component includes a support ring placed on the bottom wall of the protective tank, a limiting spring set on the top of the support ring, two linkage rods symmetrically arranged about the limiting spring and vertically installed on the bottom wall of the protective tank, and two positioning blocks set on opposite sides of the bottom ends of the two linkage rods. The tops of the two positioning blocks are both inclined surfaces, and the distance between the two inclined surfaces gradually decreases from top to bottom.

[0010] When the screw is in a loose state, the screw head is located above the two positioning blocks. When the screw is in a tight state, the side of the screw head abuts against the two positioning blocks, pushing the tops of the two linkage rods away from each other.

[0011] Preferably, the protective mechanism further includes a locking assembly, which includes a positioning ring that is parallel to the support ring and connected to a limiting spring at its bottom end, a snap-fit ​​component that is set on the top of the positioning ring and positions the screw head, and two positioning strips that are vertically installed on the opposite surfaces of the two positioning blocks. The positioning ring has positioning grooves on its symmetrical sides for the positioning strips to pass through.

[0012] When the screw is tightened, the positioning strip passes through the positioning groove; when the screw is loose, the positioning strip falls out of the positioning groove, and the positioning ring rises under the action of the limiting spring, pushing the two partitions closer to each other.

[0013] Preferably, the top of the positioning strip is provided with a protrusion. When the screw is tightened, the positioning strip passes through the positioning groove, and the protrusion passes through the positioning groove and abuts against the side of the positioning ring to form a snap-fit ​​state.

[0014] Preferably, the top end face of the positioning ring has a buffer groove arranged in a circular array, and the bottom end of the screw head is provided with multiple buffer strips that match the buffer groove.

[0015] Preferably, the engaging component includes two fixing strips disposed on the top of the positioning ring and symmetrically arranged about the screw head, and fixing blocks fixedly disposed on the opposite surfaces of the top of the two fixing strips, the distance between the two fixing blocks being less than the diameter of the screw head.

[0016] Preferably, the protective component includes a slide rod passing through a sliding groove, a slider and a connecting block slidably sleeved on each slide rod, and a protective spring sleeved on the slide rod and connected to the slider and the connecting block at both ends respectively. The slider on each slide rod is located on the rod at the end away from the partition. The top of the mounting block is provided with a sliding groove at a position symmetrical about the partition, and the length direction of the opening of the sliding groove is set along the opposite direction of the two partitions.

[0017] When the linkage is in its initial state, the baffle on each protective slot opening covers the protective slot opening.

[0018] Preferably, the protective component further includes a linkage member connecting the two linkage rods. The linkage member includes two trigger rods that are vertically arranged on the symmetrical side of the top of each linkage rod, close to each other at one end, and a fine-adjustment block that is sleeved on the end of the trigger rod by opening a fine-adjustment slot along the vertical direction. The trigger rods arranged on the two linkage rods are parallel to each other.

[0019] When the screws are not installed or are loose, the two partitions on each protective groove opening are close to each other. When the screws are turned to the tight position, the two linkage rods move away from each other, causing the two partitions on the protective groove opening to move away from each other.

[0020] Preferably, the mounting block has mating blocks on both sides that mate with the top of the terminal block. The mating blocks have through holes, and the mounting block is detachably fixed to the terminal block by bolts passing through the through holes.

[0021] Preferably, a sealing groove is provided at the bottom edge of the partition, and a sealing ring is embedded in the sealing groove, with the sealing ring fitting against the top of the mounting block.

[0022] The beneficial effects of this invention are:

[0023] 1. The sensor component detects the screw tightness in real time and controls the opening and closing of two partitions in conjunction with the protective component. When the screw is properly tightened, the partition automatically opens, revealing the protective groove opening and forming a "visual pathway" to indicate that the status is normal. When the screw is loose, the partition automatically closes, sealing the opening and forming a "visual barrier" to clearly indicate a fault. Workers can quickly and accurately determine the status of all terminals without the need for tools or close observation, significantly improving inspection efficiency and accuracy.

[0024] 2. The entire detection and alerting process is based entirely on the linkage of a purely mechanical structure, without the need for any electronic sensors, power supplies, or signal transmission lines. This completely avoids the problems of electronic components being prone to failure in complex electromagnetic environments and requiring power supply maintenance, and has extremely high environmental adaptability and long-term operational reliability.

[0025] 3. Through the cooperation of the positioning ring, positioning strip, and positioning groove in the locking assembly, a locking mechanism is formed when the screw is in the tightened state, ensuring that the partition remains stably in the open position. The locking is only released and the partition is closed by spring when the screw actually loosens and shifts, effectively preventing false triggering of the partition due to slight vibration or impact, and further improving the accuracy of the status indication.

[0026] 4. The protective mechanism is installed in the original fixing hole of the terminal block via a limiting rod, and can be optionally fixed with a mating block and bolts, achieving detachable installation without modifying the terminal block itself. At the same time, the limiting hole on the mounting block matches the screw head, allowing direct application to existing standard terminal blocks, resulting in low modification and upgrade costs and good versatility. Attached Figure Description

[0027] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention, but do not constitute a limitation thereof. In the drawings:

[0028] Figure 1 This is a schematic diagram of the structure of the power metering box of the present invention.

[0029] Figure 2 This is a schematic diagram of the mechanical terminal structure of the present invention.

[0030] Figure 3 This is a schematic diagram of the protective mechanism of the present invention installed on the terminal block.

[0031] Figure 4 This is a schematic diagram of the unfolded structure of the protective mechanism of the present invention.

[0032] Figure 5 This is a bottom view of the protective mechanism of the present invention.

[0033] Figure 6 This is a schematic diagram of the cross-sectional structure of the protective mechanism of the present invention.

[0034] Figure 7 This is a schematic diagram of the sensing component and locking component of the present invention.

[0035] Figure 8 This is a schematic diagram of the unfolded structure of the sensing component and locking component of the present invention.

[0036] Figure 9 for Figure 8 Enlarged structural diagram at point A in the middle.

[0037] Figure 10 This is a schematic diagram of the protective component structure of the present invention.

[0038] In the diagram: 1. Electricity metering box; 2. Connecting strip; 3. Terminal block; 4. Mounting block; 5. Mating block; 6. Limiting rod; 7. Fixing hole; 8. Wire hole; 9. Metal strip; 10. Lifting frame; 11. Screw; 12. Protective groove; 13. Partition plate; 14. Linkage rod; 15. Support ring; 16. Limiting spring; 17. Positioning ring; 18. Positioning block; 19. Fixing strip; 20. Positioning groove; 21. Positioning strip; 22. Trigger rod; 23. Fine-tuning block; 24. Fine-tuning slot hole; 25. Slide rod; 26. Protective spring; 27. Connecting block. Detailed Implementation

[0039] To make the technical means, creative features, achieved objectives, and effects of this invention readily understandable, the invention is further described below with reference to specific embodiments and accompanying drawings. However, the following embodiments are merely preferred embodiments of this invention and not all embodiments. Other embodiments obtained by those skilled in the art based on the embodiments described herein without creative effort are all within the protection scope of this invention.

[0040] In the electricity metering box 1, the terminal block 3 is the basic component for realizing electrical connection. Multiple terminal blocks 3 are installed on the snap-fit ​​strip 2 inside the electricity metering box 1. Each terminal block 3 is typically composed of an insulating shell, a metal strip 9 installed inside the insulating shell, two lifting frames 10 passing through the metal strip 9, and screws 11 for passing through the fixing holes 7 opened in the terminal block 3. The top end face of the terminal block 3 is flat, with two symmetrically arranged fixing holes 7. Screws 11 are inserted into the fixing holes 7 from top to bottom, and the two screws 11 are respectively located above the two lifting frames 10. The openings of the two lifting frames 10 are directly opposite the side of the terminal block 3 and have wire holes 8. When installing the wire, the wire is passed through the wire hole 8. At this time, the end of the wire passes between the bottom inner wall of the lifting frame 10 and the metal strip 9. The screw 11 is passed through the fixing hole 7. When the screw 11 is rotated, the bottom end of the screw 11 is threadedly connected to the top of the lifting frame 10, thereby driving the lifting frame 10 to move upward, so as to achieve a fixed connection between the lifting frame 10 and the wire through the metal strip 9.

[0041] However, in actual operation, due to factors such as long-term mechanical vibration, thermal expansion and contraction caused by changes in ambient temperature, and wire creep, screw 11 is prone to loosening. Once the screw loosens, the contact pressure between the wire and the metal strip 9 decreases, and the contact resistance increases significantly, leading to localized overheating. Long-term operation may cause terminal burnout, inaccurate metering, or even electrical fires. To address this problem, existing technologies mainly rely on manual periodic inspections or simple methods such as marking, but these methods have significant drawbacks, including poor real-time performance, low reliability, and the inability to visually distinguish between tight and loose states.

[0042] To overcome the above shortcomings, this invention provides an insulating protective structure for an electricity metering box. This structure can be directly installed on the top of existing terminals, and uses a purely mechanical linkage to sense the tightness of screws in real time. The automatic opening and closing of the partition provides clear and intuitive status indications. The technical solution of this invention will be described in detail below with reference to specific embodiments.

[0043] Example 1: Reference Figures 1-9 An insulating protective structure for an electricity metering box is shown, including a protective mechanism installed on the terminal blocks 3. Multiple terminal blocks 3 are installed inside the electricity metering box 1. Two fixing holes 7 are opened at the top of each terminal block 3. The protective mechanism includes a mounting block 4 detachably installed on the top of the terminal blocks 3; two limiting rods 6 vertically installed on the bottom of the mounting block 4 and capable of passing through the two fixing holes 7; a sensing component installed on the bottom wall of the protective groove 12 to detect the tightening state of screws 11; two partitions 13 symmetrically slidably installed at the opening of the protective groove 12; and a partition installed on the mounting block 4 and connected to... The sensing component and the protective components of the partition 13 have protective grooves 12 at the top of the mounting block 4 and inside the limiting rod 6. The bottom wall of the protective groove 12 has a limiting hole for the screw 11 to pass through. When the screw 11 is inserted into the limiting hole and is in a tightened state, the sensing component controls the two partitions 13 to move away from each other by triggering the protective components, opening the protective groove 12 and reminding the staff that the screw 11 is in a normal state. When the screw 11 is inserted into the limiting hole and is in a loose state, the sensing component controls the two partitions 13 to move closer to each other by the protective components, closing the protective groove 12 and reminding the staff that the screw 11 is loose.

[0044] In this embodiment, the mounting block 4 is detachably fixed by inserting the limiting rod 6 into the fixing hole 7 at the top of the terminal 3. The screw 11 passes through the limiting hole on the bottom wall of the protective groove 12 and enters the interior of the terminal 3. When the screw 11 is tightened to a secure state, the sensing component detects that the head of the screw 11 is in place, triggering the protective component to drive the two partitions 13 to move away from each other, opening the opening of the protective groove 12, allowing the operator to directly observe the status of the screw 11 inside, indicating that the connection is normal. When the screw 11 loosens and retracts due to vibration or thermal expansion and contraction, the sensing component detects the displacement change, triggering the protective component to drive the two partitions 13 to move closer to each other and close the opening of the protective groove 12, forming a visual barrier, indicating that the screw 11 has loosened and needs maintenance. This structure realizes pure mechanical real-time sensing and two-way intuitive prompting of the screw 11's tightness status, without the need for power supply or electronic components, improving the reliability and maintenance efficiency of the electrical connection in the power metering box 1.

[0045] To determine the fixing state of screw 11 using the sensing component, this embodiment provides the following solution:

[0046] like Figures 1-8 As shown, the sensing component includes a support ring 15 placed on the bottom wall of the protective groove 12, a limiting spring 16 set on the top of the support ring 15, two linkage rods 14 symmetrically arranged about the limiting springs 16 and vertically installed on the bottom wall of the protective groove 12, and two positioning blocks 18 set on the opposite sides of the bottom ends of the two linkage rods 14. The tops of the two positioning blocks 18 are both inclined surfaces, and the distance between the two inclined surfaces gradually decreases from top to bottom. When the screw 11 is in a loose state, the head of the screw 11 is located above the two positioning blocks 18. When the screw 11 is in a tight state, the side of the head of the screw 11 abuts against the two positioning blocks 18, pushing the tops of the two linkage rods 14 away from each other.

[0047] In the initial state of this embodiment, the head of screw 11 is located above the two positioning blocks 18, and the linkage rods 14 are in an initial position close to each other. When screw 11 is tightened downwards and enters a fastened state, the side of screw 11 head gradually contacts the inclined surfaces of the two positioning blocks 18. As the distance between the inclined surfaces gradually decreases from top to bottom, the head of screw 11 pushes the two positioning blocks 18 apart to both sides, thereby pushing the tops of the two linkage rods 14 away from each other. Conversely, when screw 11 loosens and retracts, the contact between screw 11 head and the inclined surfaces of positioning blocks 18 disappears, and the tops of linkage rods 14 move closer together under their own elasticity or restoring force, returning to their initial position. The sensing component converts the vertical displacement of screw 11 into the horizontal displacement of linkage rod 14 through the mechanical interference between the head of screw 11 and the inclined positioning blocks 18, providing an accurate trigger signal for the subsequent opening and closing of partition 13, and realizing pure mechanical detection of the screw 11's fastening state.

[0048] Example 2: Regarding the fixing of screw 11 within the protective groove 12, this example provides the following solution.

[0049] like Figures 1-8 As shown, the protective mechanism also includes a locking assembly, which includes a positioning ring 17 parallel to the support ring 15 and connected to a limiting spring 16 at its bottom end, a locking member on the top of the positioning ring 17 and for positioning the head of the screw 11, and two positioning strips 21 vertically mounted on opposite faces of the two positioning blocks 18. Positioning grooves 20 are provided on the symmetrical sides of the positioning ring 17 for the positioning strips 21 to pass through. When the screw 11 is in a tightened state, the positioning strips 21 pass through the positioning grooves 20. When the screw 11 is in a loose state, the positioning strips 21 fall out of the positioning grooves 20, and the positioning ring 17 rises under the action of the limiting spring 16, pushing the two partitions 13 closer to each other.

[0050] In this embodiment, when the screw 11 is tightened to a secure position, the head of the screw 11 presses the positioning ring 17 downward through the engaging component, compressing the limiting spring 16. At this time, the positioning strips 21 on the two positioning blocks 18 move outward with the linkage rod 14 and accurately enter the positioning groove 20 on the side of the positioning ring 17, forming a locking engagement, keeping the positioning ring 17 in a low position. When the screw 11 loosens and retracts, the positioning strips 21 move inward with the linkage rod 14 and disengage from the positioning groove 20, releasing the lock. The limiting spring 16 releases its elastic force, pushing the positioning ring 17 upward. Simultaneously, the top of the positioning ring 17 pushes the two partitions 13 closer together to close the opening of the protective groove 12. Through the cooperation of the positioning strips 21 and the positioning grooves 20, the positioning ring 17 is locked in a low position when the screw 11 is tightened, preventing the partitions 13 from being accidentally triggered due to vibration. The lock is released only when the screw 11 is truly loosened, driving the partitions 13 to close, thus improving the reliability and anti-interference capability of the status indication.

[0051] The top of the positioning strip 21 is provided with a protrusion. When the screw 11 is tightened, the positioning strip 21 passes through the positioning groove 20, and the protrusion passes through the positioning groove 20 and abuts against the side of the positioning ring 17, forming a snap-fit ​​state.

[0052] In this embodiment, when screw 11 is tightened downwards to the locked state, positioning ring 17 is compressed and descends, the tops of the two linkage rods 14 move away from each other, driving positioning strip 21 to move outwards and enter positioning groove 20. The protrusion on the top of positioning strip 21 further passes through positioning groove 20 and forms abutment and engagement with the side of positioning ring 17, thereby firmly locking positioning ring 17 in a low position. When screw 11 loosens and retracts, linkage rod 14 moves inwards, causing positioning strip 21 to exit positioning groove 20, the protrusion disengages from the side of positioning ring 17, the lock is released, and positioning ring 17 rises under the action of limiting spring 16. The mechanical engagement formed by the protrusion passing through the positioning groove enhances the anti-vibration and anti-loosening capability of the locking assembly, ensuring that the partition opens stably when screw 11 is tightened, avoiding false triggering due to instantaneous vibration, and improving the long-term reliability of status indication.

[0053] The top end face of the positioning ring 17 has a buffer groove arranged in a circular array, and the bottom end of the screw head 11 has multiple buffer strips that match the buffer grooves.

[0054] In this embodiment, when screw 11 is tightened downwards, the buffer strip at the bottom of the screw head gradually embeds into the buffer groove on the top end face of the positioning ring 17. The two match each other and form a circumferential limit. At the same time, the cooperation between the buffer strip and the buffer groove can absorb the instantaneous impact force during the screw tightening process. When screw 11 is in the tightened state, the buffer strip falls completely into the buffer groove, so that the screw head and the positioning ring 17 maintain stable surface contact. When screw 11 tends to loosen, the friction between the buffer strip and the buffer groove provides a certain anti-loosening resistance, delaying the screw's retraction. The buffer structure, through the matching of the buffer strip and the buffer groove, reduces the impact stress on the positioning ring 17 during the tightening process, while increasing the circumferential positioning and frictional anti-loosening capability of the screw head, thus improving the vibration resistance and long-term working stability of the protective mechanism.

[0055] like Figures 5-7 As shown, the engaging component includes two fixing strips 19 disposed on the top of the positioning ring 17 and symmetrically arranged about the head of the screw 11, and fixing blocks fixedly disposed on the opposite surfaces of the tops of the two fixing strips 19. The distance between the two fixing blocks is less than the diameter of the head of the screw 11.

[0056] In this embodiment, when the screw 11 is screwed in downwards, the head of the screw 11 first contacts the fixing blocks on the opposite surfaces of the tops of the two fixing strips 19. Since the distance between the two fixing blocks is less than the diameter of the screw 11 head, the screw 11 head will push the two fixing strips 19 apart and pass over the fixing blocks. Subsequently, the fixing strips 19 return to their original position due to their own elasticity, causing the fixing blocks to be locked below the screw 11 head, thereby connecting the positioning ring 17 and the screw 11 head as one unit. When the screw 11 loosens and retracts upwards, the fixing blocks move upwards synchronously with the screw 11 head, causing the positioning ring 17 to rise. The engaging component reliably fixes the positioning ring 17 to the screw 11 head through elastic clamping, ensuring that the positioning ring 17 can accurately follow the lifting and lowering movement of the screw 11, realizing the motion transmission between the sensing component and the locking component. The structure is simple and requires no additional fasteners.

[0057] like Figure 9 As shown, the protective assembly includes a slide rod 25 passing through a sliding groove, a slider and a connecting block 27 slidably sleeved on each slide rod 25, and a protective spring 26 sleeved on the slide rod 25 with its two ends connected to the slider and the connecting block 27 respectively. The slider on each slide rod 25 is located on the rod at the end away from the partition 13. The top of the mounting block 4 has a sliding groove symmetrically positioned about the partition 13, and the length direction of the sliding groove opening is set along the opposite direction of the two partitions 13. When the linkage rod 14 is in the initial state, the partition 13 on each protective groove 12 opening covers the protective groove 12 opening.

[0058] like Figure 9 As shown, the protective assembly also includes a linkage component connecting the two linkage rods 14. The linkage component includes two trigger rods 22 that are vertically arranged on the symmetrical sides of the top of each linkage rod 14 with one end close to each other, and a fine adjustment block 23 that is sleeved on the end of the trigger rod 22 through a fine adjustment slot 24 opened vertically. The trigger rods 22 on the two linkage rods 14 are parallel to each other. When the screw 11 is not installed or is loose, the two partitions 13 on the opening of each protective groove 12 are close to each other. When the screw 11 is turned to the tight state, the two linkage rods 14 move away from each other, causing the two partitions 13 on the opening of the protective groove 12 to move away from each other.

[0059] In this embodiment, when the screw 11 is not installed or is loose, the two linkage rods 14 are close to each other, and the trigger rods 22, which are located on the symmetrical side of the top of each linkage rod 14, are in the retracted position. The end of the trigger rod 22 is fitted onto the fine adjustment block 23 through the fine adjustment slot 24 opened vertically. The fine adjustment block 23 is connected to the partition 13. At this time, the opposite faces of the two partitions 13 are close to each other, closing the opening of the protective groove 12. When the screw 11 is rotated to the tightened state, the tops of the two linkage rods 14 move away from each other, causing the trigger rod 22 to move outward. The trigger rod 22 pushes the fine adjustment block 23 through the fine adjustment slot 24, thereby causing the two partitions 13 to move away from each other and opening the opening of the protective groove 12. The vertical gap of the fine adjustment slot 24 can compensate for the height direction installation error between the linkage rod 14 and the partition 13, ensuring smooth transmission without jamming. The horizontal displacement of the linkage rod 14 is efficiently converted into the sliding opening and closing of the partition 13, realizing an instant response to the tightening state of the screw 11. At the same time, the assembly precision requirements are reduced by fine-tuning the structure, improving the assembly convenience and transmission reliability of the protective mechanism.

[0060] like Figures 2-6 As shown, mounting block 4 has mating blocks 5 on both sides that mate with the top of terminal 3. The mating blocks 5 have through holes, and the mounting block 4 is detachably fixed to terminal 3 by bolts passing through the through holes.

[0061] In this embodiment, after the mounting block 4 is placed on the top of the terminal block 3, the mating blocks 5 on both sides of the mounting block 4 fit snugly against the top of the terminal block 3. By passing bolts through the through holes in the mating blocks 5 and tightening them, the mounting block 4 can be detachably fixed to the terminal block 3. When disassembly is required, simply loosen the bolts to remove the mounting block 4. This fixing method has a simple structure and is easy to operate, achieving a stable connection between the protective mechanism and the terminal block 3. It also facilitates subsequent maintenance or replacement without altering the original structure of the terminal block 3, and has good versatility and operability.

[0062] A sealing groove is provided at the bottom edge of the partition 13, and a sealing ring is embedded in the sealing groove. The sealing ring fits against the top of the mounting block 4.

[0063] In this embodiment, when the two partitions 13 approach each other and close the opening of the protective groove 12, the sealing ring embedded in the sealing groove at the bottom edge of the partition 13 fits tightly with the top of the mounting block 4, forming an effective sealing barrier. When the partitions 13 move away from each other and the opening is opened, the sealing ring disengages from the fitted state along with the partitions. This sealing structure prevents external dust, moisture, and foreign objects from entering the interior of the protective groove 12, protects the screws 11 and connection points from contamination and corrosion, and improves the long-term reliability and environmental adaptability of the insulation protection.

[0064] The usage process of this invention:

[0065] During installation, insert the two limiting rods 6 at the bottom of the mounting block 4 into the two fixing holes 7 at the top of the terminal block 3, and fix the mounting block 4 to the top of the terminal block 3 by passing bolts through the through holes on the mating block 5, so that the limiting holes on the bottom wall of the protective groove 12 are coaxially aligned with the fixing holes 7 on the terminal block 3; then insert the wire through the wire hole 8 on the side of the terminal block 3, so that the end of the wire is located between the bottom inner wall of the lifting frame 10 and the metal strip 9; then take the screw 11, pass it through the limiting hole and screw it into the fixing hole 7, so that its bottom end is aligned with the top screw of the lifting frame 10. With the screw thread connected, continue tightening screw 11. During the descent of screw 11, the fixing strip 19 is first opened by the fixing block of the engaging piece and then reset, so that the positioning ring 17 is engaged below the screw head and compresses the limiting spring 16 downward. At the same time, the side of the screw head abuts against the inclined surfaces of the two positioning blocks 18, pushing the tops of the two linkage rods 14 away from each other, causing the positioning strip 21 to move outward and enter the positioning groove 20 on the side of the positioning ring 17, and the protrusion abuts against the side of the positioning ring 17 to form a locking engagement. When the tops of the linkage rods 14 move away from each other, the trigger rod 2... 2. The slider is pushed along the slide bar 25 by the fine-tuning block 23, compressing the protective spring 26, thereby driving the two partitions 13 to move away from each other and opening the protective groove 12. At this time, the sealing ring is disengaged from the top of the mounting block 4, and the operator can directly observe the screw head to judge that it is in a normal tightening state. When the screw 11 loosens and retracts due to vibration or thermal expansion and contraction during equipment operation, the screw head's contact with the inclined surface of the positioning block 18 disappears and the pressure on the positioning ring 17 is reduced. The linkage rod 14 resets inward, causing the positioning strip 21 to exit the positioning groove 20, and the convex... When the block disengages from its contact and releases its lock, the limit spring 16 pushes the positioning ring 17 upward. Simultaneously, the linkage rod 14 drives the trigger rod 22 to move inward. Through the fine-tuning block 23, the slider and connecting block 27 are pulled, causing the protective spring 26 to release energy or be further compressed. This drives the two partitions 13 to move closer together until the sealing ring is in contact with the top of the mounting block 4, sealing the opening of the protective groove 12. This creates a visual barrier indicating that the screws are loose and need maintenance. When disassembly and maintenance are required, simply loosen the bolts on the mating block 5 to remove the entire protective mechanism without affecting the original connection of the wiring terminal 3. This achieves a fully mechanical linkage from installation, tightening indication, loosening alarm to disassembly, requiring no power supply or electronic components, making it intuitive and reliable.

[0066] 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 preferred examples and are not intended to limit 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 insulating protective structure for an electricity metering box, comprising a protective mechanism installed on a terminal block (3), wherein a plurality of terminal blocks (3) are installed inside the electricity metering box (1), and two fixing holes (7) are provided at the top of the terminal blocks (3), characterized in that, The protective mechanism includes a mounting block (4) that can be detachably installed on the top of the terminal block (3), two limiting rods (6) that are vertically installed on the bottom of the mounting block (4) and can pass through two fixing holes (7), a sensing component that is set on the bottom wall of the protective groove (12) and detects the tightness of the screw (11), two partitions (13) that are symmetrically slidably set on the opening position of the protective groove (12), and a protective component that is set on the mounting block (4) and connects the sensing component and the partitions (13). The top of the mounting block (4) and the limiting rods (6) are provided with a protective groove (12), and the bottom wall of the protective groove (12) is provided with a limiting hole for the screw (11) to pass through. When the screw (11) is inserted into the limiting hole and is in a tightened state, the sensing component controls the two partitions (13) to move away from each other by triggering the protective component, opening the protective groove (12) and reminding the staff that the screw (11) is in a normal state; when the screw (11) is inserted into the limiting hole and is in a loose state, the sensing component controls the two partitions (13) to move closer to each other by triggering the protective component, closing the protective groove (12) and reminding the staff that the screw (11) is loose.

2. The insulating protection structure for an electricity metering box according to claim 1, characterized in that: The sensing component includes a support ring (15) placed on the bottom wall of the protective groove (12), a limiting spring (16) set on the top of the support ring (15), two linkage rods (14) symmetrically arranged about the limiting springs (16) and vertically installed at their bottom ends on the bottom wall of the protective groove (12), and two positioning blocks (18) set on opposite sides of the bottom ends of the two linkage rods (14). The top ends of the two positioning blocks (18) are both inclined surfaces, and the distance between the two inclined surfaces gradually decreases from top to bottom. When the screw (11) is in a loose state, the head of the screw (11) is above the two positioning blocks (18). When the screw (11) is in a tight state, the side of the head of the screw (11) abuts against the two positioning blocks (18), pushing the tops of the two linkage rods (14) away from each other.

3. The insulating protection structure for an electricity metering box according to claim 2, characterized in that: The protective mechanism also includes a locking assembly, which includes a positioning ring (17) that is parallel to the support ring (15) and connected to the bottom end of a limiting spring (16), a snap-fit ​​part that is set on the top of the positioning ring (17) and positions the head of the screw (11), and two positioning strips (21) that are vertically mounted on opposite sides of two positioning blocks (18). The positioning ring (17) has positioning grooves (20) on its symmetrical sides for the positioning strips (21) to pass through. When the screw (11) is in a tightened state, the positioning strip (21) passes through the positioning groove (20); when the screw (11) is in a loose state, the positioning strip (21) falls out of the positioning groove (20), and the positioning ring (17) rises under the action of the limiting spring (16), pushing the two partitions (13) closer to each other.

4. The insulating protection structure for an electricity metering box according to claim 3, characterized in that: The top of the positioning strip (21) is provided with a protrusion. When the screw (11) is tightened, the positioning strip (21) passes through the positioning groove (20), and the protrusion passes through the positioning groove (20) and abuts against the side of the positioning ring (17) to form a snap-fit ​​state.

5. The insulating protection structure for an electricity metering box according to claim 3, characterized in that: The top end face of the positioning ring (17) is provided with a buffer groove in a circular array, and the bottom end of the head of the screw (11) is provided with multiple buffer strips that match the buffer groove.

6. The insulating protective structure for an electricity metering box according to claim 3 or 5, characterized in that: The engaging component includes two fixing strips (19) disposed on the top of the positioning ring (17) and symmetrically arranged about the head of the screw (11), and fixing blocks fixedly disposed on the opposite surfaces of the tops of the two fixing strips (19), the distance between the two fixing blocks being less than the diameter of the head of the screw (11).

7. The insulating protection structure for an electricity metering box according to claim 1, characterized in that: The protective components include a slide rod (25) passing through a sliding groove, a slider and a connecting block (27) slidably sleeved on the body of each slide rod (25), and a protective spring (26) sleeved on the body of the slide rod (25) with the slider and connecting block (27) connected at both ends respectively. The slider on each slide rod (25) is located on the end of the rod away from the partition (13). The top of the mounting block (4) is provided with a sliding groove at a position symmetrical about the partition (13), and the length direction of the opening of the sliding groove is set along the opposite direction of the two partitions (13). When the linkage rod (14) is in the initial state, the partition (13) on each protective groove (12) opening covers the protective groove (12) opening.

8. The insulating protective structure for an electricity metering box according to claim 7, characterized in that: The protective assembly also includes a linkage component that connects the two linkage rods (14). The linkage component includes two trigger rods (22) that are vertically arranged on the symmetrical side of the top of each linkage rod (14) and a fine adjustment block (23) that is sleeved on the end of the trigger rod (22) by opening a fine adjustment slot (24) in the vertical direction. The trigger rods (22) on the two linkage rods (14) are parallel to each other. When the screw (11) is not installed or is loose, the two partitions (13) on the opening of each protective groove (12) are close to each other. When the screw (11) is turned to the tight state, the two linkage rods (14) move away from each other, causing the two partitions (13) on the opening of the protective groove (12) to move away from each other.

9. The insulating protective structure for an electricity metering box according to claim 1, characterized in that: The mounting block (4) has mating blocks (5) on both sides that mate with the top of the terminal block (3). The mating blocks (5) have through holes, and the mounting block (4) is detachably fixed to the terminal block (3) by passing bolts through the through holes.

10. The insulating protective structure for an electricity metering box according to claim 1, characterized in that: A sealing groove is provided at the bottom edge of the partition (13), and a sealing ring is embedded in the sealing groove. The sealing ring fits against the top of the mounting block (4).

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