Busbar protection tool

Abstract

The embodiment of the application relates to the technical field of electric power tools, in particular to a busbar protection tool, which comprises an insulating shell and a voltage measurement hole, the insulating shell has an internal cavity for wrapping a busbar and an external cable terminal; the voltage measurement hole is arranged on the insulating shell and is used for voltage measurement; the protection tool disclosed by the application is wrapped around the busbar and the external cable terminal by the insulating shell, the insulating shell can replace an existing sheep horn sleeve, insulation protection of a bare live part is realized, and personnel is prevented from being mistakenly touched and electrified or equipment is prevented from being short-circuited to ground; meanwhile, the voltage measurement hole is directly arranged on the insulating shell, so that when a voltage measurement work is performed, an operator does not need to disassemble any component, and a multimeter pen is directly inserted through the voltage measurement hole to contact an internal live body to perform measurement, and in this way, the risk of personnel being electrified, equipment being short-circuited to ground and equipment being damaged due to disassembly of the sheep horn sleeve is essentially eliminated.

Description

Technical Field

[0001] This application relates to the field of power accessory technology, specifically to a busbar protection tool. Background Technology

[0002] In the low-voltage power distribution system of a nuclear power plant, to ensure power supply reliability and equipment safety, it is necessary to regularly measure the operating voltage at the outlet of the Schneider low-voltage switchboard drawer to assess power quality and troubleshoot line faults. Simultaneously, during inspections, attention should be paid to whether there are signs of overheating and oxidation at the connection points between the busbar (copper busbar) and cable terminals to prevent equipment damage or fire accidents caused by poor contact. Therefore, voltage testing and visual inspection of this location while the equipment is energized are routine electrical maintenance procedures.

[0003] Currently, horn-shaped sleeves are commonly used for insulation protection in this area. These sleeves are corrugated rubber parts, tapered at one end. When using them, a notch must be cut according to the size of the cable core to fit the cable, while the other end completely covers the L-shaped copper busbar and terminals. During voltage measurement, workers wearing insulated gloves must painstakingly remove the sleeve from the copper busbar while the circuit is energized, and then re-sleeve it after the measurement is complete. This process presents significant technical problems: due to the L-shaped wrapping structure of the sleeve, the corrugated resistance, and the nesting caused by the dense arrangement of the outgoing terminals, removal and repositioning are extremely difficult, severely hindering work efficiency (approximately 20 minutes per drawer) and posing high risks such as electric shock and short circuits caused by accidental meter needle contact with the cabinet. Therefore, there is an urgent need for a protective tool that allows voltage measurement without disassembly. Summary of the Invention

[0004] The summary section introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. This part of the invention is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0006] Therefore, a first aspect of the present invention provides a busbar protection tool, an insulating housing having an internal cavity for wrapping the busbar and external cable terminals; Multiple voltage measurement holes are provided in the insulating housing. When a voltage measurement probe is inserted into one of the voltage measurement holes, the voltage of the busbar can be measured.

[0007] In one feasible implementation, the insulating housing includes: The side plate is L-shaped, and two side plates are arranged opposite to each other. The voltage measurement holes are arranged in a rectangular array on the side plate. A base plate, which is L-shaped, is disposed on one side of the two side plates and is used to connect the two side plates. The cover plate is L-shaped and is detachably mounted on the other side of the two side plates.

[0008] In one feasible implementation, it further includes: A card strip, wherein the card strip is disposed on the side plate and the card strip is provided with a card slot; A snap-fit ​​component is disposed on the cover plate and is elastically snapped into the slot.

[0009] In one feasible implementation, it further includes: A cover plate locking assembly is disposed inside the insulating housing. When the voltage measuring probe is inserted into the measuring hole, the cover plate locking assembly can be triggered to lock the cover plate.

[0010] In one feasible implementation, the cover plate locking assembly includes: Multiple sliders are provided, and the inner side of the side plate is provided with multiple parallel sliding grooves. The sliding grooves are perpendicular to the cover plate. The multiple sliders are slidably disposed on the inner side of the side plate and can slide along the direction of approaching and moving away from the cover plate. Multiple trigger blocks are provided along the length of each slider, and each voltage measurement hole corresponds to one trigger block. Each trigger block is provided with an inclined surface extending along the axial direction of the voltage measurement hole. When the voltage measurement probe is inserted into the voltage measurement hole, it contacts the inclined surface and pushes the slider to slide. A stroke amplification unit is provided on each of the sliders, and the stroke amplification unit is used to amplify the first stroke of the slider to a second stroke; A push block, wherein the push block is disposed at the end of the plurality of stroke amplification units; A locking unit is disposed on the inner side of the cover plate. One side of the locking unit is fixedly connected to the push block. When the stroke amplification unit generates the second stroke, it drives the push block to slide and triggers the locking unit to act, thereby locking the cover plate. Multiple first springs are provided, with one first spring between each slider and the inner wall of the corresponding groove. The first spring is used to drive the slider to reset when unlocked and to maintain compressed energy storage when locked.

[0011] In one feasible implementation, the stroke amplification unit includes: U-shaped block, the U-shaped block being disposed on the slider; A first swing arm, which is hinged to the U-shaped block; The second pendulum arm is hinged to the first pendulum arm; A push rod, wherein the push rod is disposed on the second swing arm; A fixing block is disposed on the inner wall of the side plate, and the push rod passes through the fixing block and is slidably connected to the fixing block; The push block is fixedly connected to the plurality of push rods.

[0012] In one feasible implementation, the locking unit includes: The substrate has a convex cross-section, a through hole extending through its axial direction at its center, an annular groove communicating with the through hole inside the substrate, and sliding holes communicating with the interior of the annular groove on opposite sides of the substrate. A linkage block is disposed on the outer side of the base body. The linkage block is slidably connected to the side plate and fixedly connected to the push block. When the push block pushes the linkage block to slide, it causes the base body to slide along the direction of approaching and moving away from the cover plate. At least two lock cylinders are disposed within the annular groove, the lock cylinders are capable of sliding radially along the annular groove, and the lock cylinders have a wedge-shaped structure; A connecting rod is provided on each of the lock cylinders, and the connecting rod passes through the sliding hole; A fixing sleeve is disposed on the outer side wall of the base, and the fixing sleeve is provided for each of the sliding holes; A second spring is disposed between the connecting rod and the inner wall of the fixed sleeve; A locking rod, one end of which is disposed in the through hole, and the other end of which passes through the cover plate; The lock body is disposed in the through hole and sleeved on the lock rod. The lock body is shaped like a frustum.

[0013] In one feasible implementation, it further includes: An unlocking sleeve is fitted onto the locking rod, the unlocking sleeve is threadedly connected to the locking rod, and the unlocking sleeve is slidably connected to the cover plate.

[0014] In one feasible implementation, the insulating housing further includes: Outer expansion plates are respectively inclined outwards at one end of the side plate and the bottom plate, and the three outer expansion plates form a flared opening for accommodating external cable terminals.

[0015] In one feasible implementation, it further includes: A thermal sticker is disposed on the side plate and is used to monitor the temperature of the busbar.

[0016] Compared with the prior art, the present invention has at least the following beneficial effects: The busbar protection tool provided in this application includes an insulating shell and a voltage measuring hole. The insulating shell has an internal cavity for wrapping the busbar and external cable terminals. The voltage measuring hole is disposed in the insulating shell and is used for voltage measurement. Therefore, the protection tool disclosed in this invention, by setting an insulating shell that wraps around the busbar and external cable terminals, can replace the existing horn sleeve, achieving insulation protection for exposed live parts and preventing personnel from accidentally touching and getting electric shocks or equipment from grounding and short-circuiting. At the same time, by directly setting the voltage measuring hole on the insulating shell, maintenance personnel can perform voltage measurement work without disassembling any parts. They can directly insert the multimeter probes through the voltage measuring hole to contact the internal live parts for measurement. This method essentially eliminates the risk of personnel electric shock, equipment short-circuiting and grounding, and equipment damage caused by disassembling the horn sleeve. In addition, the set cover locking component also solves the problem of the cover plate accidentally falling off under vibration, collision, or material aging conditions caused by the elastic snap-fit ​​method on the insulating shell, effectively ensuring safety.

[0017] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and in order to make the above and other objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described below. Attached Figure Description

[0018] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 The three-dimensional busbar protection tool provided in the first embodiment of this application Figure 1 ; Figure 2 Three-dimensional busbar protection tool provided in this application Figure 2 ; Figure 3 for Figure 2 A magnified view of a section at point A above; Figure 4 Diagram showing the state when the cover plate is locked to the base (side plate not shown); Figure 5Front view when the cover plate is locked to the base; Figure 6 for Figure 5 A sectional view.

[0019] in, Figure 1 The correspondence between the reference numerals and component names in the figure is as follows: 1. Insulating housing; 1-1. Side plate; 1-2. Base plate; 1-3. Cover plate; 1-11. Locking strip; 1-31. Snap-fit ​​component; 1-4. Outer expansion plate; 2. Voltage measuring hole; 3. Thermal sticker; 4. Cover plate locking assembly; 4-1. Sliding bar; 4-2. Trigger block; 4-3. Stroke amplification unit; 4-31. U-shaped block; 4-32. First rocker arm; 4-33. Second rocker arm; 4-34. Push rod; 4-35. Fixing block; 4-4. Locking unit; 4-41. Base; 4-42. Lock cylinder; 4-43. Connecting rod; 4-44. Fixing sleeve; 4-45. Second spring; 4-46. Locking rod; 4-47. Lock body; 4-48. Unlocking sleeve; 4-49. Linkage component; 4-5. Push block; 4-6. First spring; 4-7. Pad block. Detailed Implementation

[0020] The following description provides numerous specific details to offer a more thorough understanding of the technical solutions provided by this invention. However, it will be apparent to those skilled in the art that the technical solutions provided by this invention can be implemented without one or more of these details.

[0021] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms “comprising” and / or “including” are used in this specification, they indicate the presence of the stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or combinations thereof.

[0022] Exemplary embodiments according to the present invention will now be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments may be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein. It should be understood that these embodiments are provided so that the disclosure of the invention is thorough and complete, and that the concept of these exemplary embodiments is fully conveyed to those skilled in the art.

[0023] To better understand the above technical solutions, the technical solutions of the embodiments of this application will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments of this application and the specific features in the embodiments are detailed descriptions of the technical solutions of the embodiments of this application, rather than limitations on the technical solutions of this application. In the absence of conflict, the embodiments of this application and the technical features in the embodiments can be combined with each other.

[0024] like Figures 1 to 3 As shown, a busbar protection tool is provided according to a first aspect of the present application, comprising: an insulating housing 1 and a plurality of voltage measuring holes 2, wherein the insulating housing 1 has an internal cavity for wrapping the busbar and external cable terminals; the plurality of voltage measuring holes 2 are disposed in the insulating housing 1 and are used for voltage measurement.

[0025] In this technical solution, the insulating housing 1 can be made of high-transparency PC endurance board, or other materials with insulation, transparency, high temperature resistance, and flame retardancy can be selected. The overall shape of the insulating housing 1 is designed as an L-shaped structure that conforms to the shape of the L-shaped copper busbar and external cable terminals, so as to completely cover the exposed L-shaped copper busbar and wiring terminals. The voltage measuring hole 2 is set on the side wall of the insulating housing 1. Multiple rows of measuring holes (first rectangular array) are opened at the position corresponding to the front section of the L-shaped copper busbar (the part extending from the drawer switch body), and multiple rows of measuring holes (second rectangular array) are opened at the position corresponding to the middle section of the copper busbar (the position of the wiring bolt), and the number of holes is maximized while ensuring the mechanical strength of the housing. The voltage measuring hole 2 serves as an insertion channel for the multimeter probes during voltage measurement, and also as a heat dissipation hole during normal operation of the equipment. In practice, the part of the voltage measuring hole 2 closest to the copper busbar is used as a measuring hole, and the rest is used as a heat dissipation hole. The diameter of the voltage measuring hole 2 is 2.8mm-3.3mm. The preferred size is 3.0mm; this size of measuring hole diameter can ensure that the standard multimeter probes can be smoothly inserted and contact the internal live parts, while effectively preventing accidental contact by human fingers or metal foreign objects, thus meeting the requirements for electric shock protection; at the same time, the measuring hole also serves as a heat dissipation hole during daily operation, without affecting the normal heat dissipation of the copper busbar.

[0026] Understandably, this solution utilizes an insulating housing 1 that encloses the busbar and external cable terminals. This insulating housing 1 replaces the existing horn-shaped sleeves, providing insulation protection for exposed live parts and preventing accidental electric shock or equipment grounding short circuits. Simultaneously, voltage measurement holes 2 are directly installed on the insulating housing 1, allowing maintenance personnel to perform voltage measurements without disassembling any components. They can simply insert the multimeter probes through the voltage measurement holes 2 to contact the internal live parts for measurement. This method fundamentally eliminates the risks of electric shock, equipment short circuits, and equipment damage caused by removing the horn-shaped sleeves. Furthermore, this design optimizes personnel allocation for voltage measurement. Under the existing horn-shaped sleeve solution, one person is required to remove the sleeves and operate the multimeter probes (operator), one person is required to monitor for safety (monitor), and another person is required to record the measurement values ​​(recorder), requiring a total of three people working together. With this protective tool, since no parts need to be disassembled, the operator can directly insert the test leads through the voltage measurement hole to complete the measurement, which greatly reduces the difficulty and risk of operation. Therefore, the operator can also perform the recording work at the same time. Only two people are needed (one to operate and record, and one to supervise) to complete the measurement task in a standardized and safe manner, thereby reducing the personnel configuration from 3 people to 2 people and significantly improving work efficiency.

[0027] In one feasible embodiment, the insulating housing 1 includes: a side plate 1-1, a bottom plate 1-2, and a cover plate 1-3; wherein the side plate 1-1 is L-shaped, the two side plates 1-1 are arranged opposite to each other, and the voltage measuring hole 2 is disposed on the side plate 1-1; the bottom plate 1-2 is L-shaped, the bottom plate 1-2 is disposed on one side of the two side plates 1-1, and the bottom plate is used to connect the two side plates 1-1; the cover plate 1-3 is L-shaped, and the cover plate 1-3 is detachably disposed between the other side of the two side plates 1-1.

[0028] In this technical solution, the side plate 1-1, bottom plate 1-2, and cover plate 1-3 can all be made of high-transparency PC endurance board. The side plate 1-1 is divided into a first part corresponding to the front section of the L-shaped copper busbar, and a second part corresponding to the middle section of the L-shaped copper busbar and the cable. Both the first and second parts are rectangular structures, connected to form an L-shape, with dimensions matching the L-shaped outgoing copper busbar on site. The first part has the same dimensions as the outgoing copper busbar extending from the drawer switch body, with a width equal to the copper busbar thickness plus an appropriate allowance (e.g., 2-5mm). The second part is designed to be wider (e.g., 30-50mm) to accommodate the wiring bolts. As an alternative, the side plate 1-1 and bottom plate 1-2 can be integrally molded, and the cover plate 1-3 can be detachably connected to the two side plates 1-1. The bottom plate 1-2 is provided with bolt clearance holes for the bolts used to fix the cable, allowing the wiring bolts to be installed normally and facilitating routine tightening by maintenance personnel.

[0029] It is understandable that the insulating shell 1 formed by the two side plates 1-1, the bottom plate 1-2 and the cover plate 1-3 has an L-shaped internal cavity inside. This internal cavity can completely enclose the L-shaped copper busbar and the external cable terminals. Compared with the existing horn sleeve, its shape fits the copper busbar perfectly. Moreover, because the cover plate 1-3 is detachably connected to the side plates, it can avoid the disassembly difficulties caused by the corrugated and conical structure. It can meet the different work needs such as equipment maintenance and cable replacement. This structure is compact and lightweight and does not take up extra space.

[0030] In one feasible implementation, the busbar protection tool further includes: a locking strip 1-11 and a locking member 1-31. The locking strip 1-11 is disposed on the side plate 1-1 and has a locking groove. The locking member 1-31 is disposed on the cover plate 1-3 and is elastically engaged with the locking groove.

[0031] In this technical solution, the locking strip 1-11 and the locking component 1-31 are made of the same material as the insulating housing 1. The locking groove can be a trapezoidal groove, and the locking component 1-31 is a corresponding elastic hook. As an alternative, the positions of the locking component 1-31 and the locking groove 1-11 can be interchanged (the locking groove is located on the cover plate, and the hook is located on the side plate). To achieve reliable elastic locking, a guide elastic slope can be provided on the outer side of the hook of the locking component 1-31. When the cover plate 1-3 is pressed, the elastic slope contacts the edge of the locking groove and generates elastic deformation, thus completing the locking. When disassembly is required, simply pull the entire cover plate 1-3 outward, and the cover plate 1-3 will disengage the locking component 1-31 when subjected to force. As an alternative, the positions of the locking component 1-31 and the locking groove can be interchanged (the locking groove is located on the cover plate, and the hook is located on the side plate).

[0032] Understandably, this solution uses snap-fit ​​connections to achieve a detachable connection between cover plates 1-3, allowing for quick assembly and disassembly without tools, significantly reducing the difficulty of daily inspections or maintenance. However, this purely elastic snap-fit ​​method carries certain safety risks: during long-term operation of the equipment, subject to vibration, accidental impacts, or aging of the snap-fit ​​materials, the snap hooks may unpredictably loosen, causing the cover plates to fall off unattended. Once cover plates 1-3 detach, the internal live busbars and cable terminals will be completely exposed, posing a significant risk of serious accidents such as electric shock, short circuits caused by foreign objects, or short circuits between adjacent phases. Therefore, in addition to the elastic snap-fit ​​connection, it is necessary to add an extra locking mechanism to ensure that cover plates 1-3 are forcibly fixed in the closed position during critical operations such as measurement, fundamentally eliminating the risk of falling.

[0033] like Figure 2 As shown, in one feasible embodiment, the busbar protection tool also includes a cover plate locking assembly 4, which is disposed inside the insulating housing 1. When the voltage measuring probe is inserted into the measuring hole, the cover plate locking assembly 4 can be triggered to lock the cover plate.

[0034] In this technical solution, the cover plate locking assembly 4 is linked to the voltage measurement hole, and its triggering method is purely mechanical, requiring no additional power supply or sensor. When maintenance personnel insert the multimeter probes into any measurement hole to measure the voltage, the probes directly push the transmission component inside the locking assembly, causing the locking mechanism to enter the locked state and fixing the cover plates 1-3 in the closed position.

[0035] Understandably, this solution solves the problem of accidental cover plate detachment that may occur under conditions such as vibration, collision, or material aging by adding a cover plate locking component 4.

[0036] like Figure 2 As shown, in one feasible embodiment, the cover plate locking assembly 4 includes multiple slide bars 4-1, multiple trigger blocks 4-2, a stroke amplification unit 4-3, a push block 4-5, a locking unit 4-4, and multiple first springs 4-6; wherein the inner surface of the side plate 1-1 is provided with multiple parallel sliding grooves, the sliding grooves being perpendicular to the cover plate 1-3, the multiple slide bars 4-1 being slidably disposed on the inner side of the side plate 1-1, the multiple slide bars 4-1 being able to slide along directions approaching and away from the cover plate 1-3; multiple trigger blocks 4-2 are arranged along the length direction of each slide bar 4-1, each voltage measuring hole corresponding to one trigger block 4-2, the trigger blocks 4-2... An inclined surface extending axially along the voltage measurement hole is provided on the top. When the voltage measurement probe is inserted into the voltage measurement hole, it contacts the inclined surface and pushes the slide bar 4-1 to slide. Each slide bar 4-1 is provided with a stroke amplification unit. The stroke amplification unit 4-3 is used to amplify the first stroke of the slide bar 4-1 into a second stroke. The push block 4-5 is provided at the end of multiple sets of stroke amplification units. The locking unit 4-4 is provided on the inner side of the cover plate 1-3. One side of the locking unit 4-4 is fixedly connected to the push block 4-5. When the stroke amplification unit 4-3 generates the second stroke, it drives the push block 4-5 to slide and triggers the locking unit 4-4 to act, thereby locking the cover plate 1-3. The first spring 4-6 is provided between the end of the slide bar 4-1 and the inner wall of the slide groove. The first spring 4-6 is used to drive the slide bar to reset when unlocking and to maintain compressed energy storage in the locked state.

[0037] In this technical solution, the number of sliders 4-1 can be determined according to the number of rows of the measuring hole array. For example, three rows of measuring holes correspond to three parallel sliders, or two rows of measuring holes can be grouped together, with each row sharing a slider. The slider is positioned in the middle of these two rows of measuring holes. To simplify the structure, this design is preferred in this embodiment. The trigger block 4-2 on each slider is aligned with each measuring hole in the corresponding row. The bevel angle on the trigger block 4-2 is preferably 30°-45° to ensure that the probe can smoothly push the slider 4-1. The spring force of the first spring 4-6 should be selected to be only able to overcome the weight of the slider itself and a small amount of friction, so as not to increase the resistance to probe insertion. In order to cope with the stress relaxation that may occur due to long-term compression of the first spring 4-6, the spring force of the first spring 4-6 should be as small as possible while meeting the unlocking and reset requirements, so as not to increase the resistance to probe insertion. To this end, its rated spring force is designed to be twice the minimum force required for the slider 4-1 to reset (i.e., the minimum force required to overcome gravity and friction), leaving a spring force margin to cope with the stress relaxation that may occur due to long-term compression. With this design, the actual spring force is still small and will not cause any perceptible additional resistance to probe insertion, leaving sufficient spring force margin. Even if the spring force decays by no more than 40% within ten years of service, its residual spring force is still sufficient to drive the slider 4-1 to reset reliably, ensuring that all components reset normally when unlocking.

[0038] Understandably, this solution achieves independent triggering of multiple rows of measuring holes by setting multiple sliders 4-1. The insertion of a probe into any measuring hole will drive the slider 4-1 of its corresponding row to slide, which in turn amplifies the stroke of the slider 4-1 through the stroke amplification unit 4-3 and the push block 4-5, ultimately triggering the locking unit 4-4. This locking structure ensures that the cover plate 1-3 can be reliably locked even if only one measuring hole is used.

[0039] In one feasible implementation, such as Figure 3 As shown, the stroke amplification unit 4-3 includes a U-shaped block 4-31, a first swing rod 4-32, a second swing rod 4-33, a push rod 4-34, and a fixed block 4-35. The U-shaped block 4-31 is disposed on the slide bar 4-1, the first swing rod 4-32 is hinged to the U-shaped block 4-31, and the second swing rod 4-33 is hinged to the first swing rod 4-32. The push rod 4-34 is disposed on the second swing rod 4-33. The fixed block 4-35 is disposed on the pad 4-7 on the inner wall of the side plate 1-1, and the push rod 4-34 passes through the fixed block 4-35 and is slidably connected to the fixed block 4-35. The push block 4-5 is fixedly connected to multiple push rods 4-34.

[0040] In this technical solution, the U-shaped block 4-31 moves together with the slider 4-1, causing the first swing rod 4-32 to swing. The first swing rod 4-32 then drives the second swing rod 4-33, and the end of the second swing rod 4-33 drives the push rod 4-34 to move linearly along the guide hole of the fixed block 4-35. By reasonably designing the length ratio of the first swing rod 4-32 to the second swing rod 4-33 (for example, the length ratio of the first swing rod to the second swing rod is 1:2 to 1:3), this solution can enlarge the small first stroke of the slider 4-1 (for example, 1 mm) to the large second stroke of the push rod 4-34 (for example, 3-5 mm). The ends of push rods 4-34 are connected to push block 4-5, thus converging multiple travel paths. This allows the cover plate 1-3 to be locked when a measuring probe is inserted into any of the measuring holes. Furthermore, after the protective tool is initially installed, the cover plate should also be mechanically locked using this probe insertion method to ensure safety. In practice, during the first insertion, the probe pushes the trigger block, the slider begins to slide, and the probe continues to penetrate deeper to contact the live conductor to complete the measurement. After the measurement is complete, the probe is pulled out. Because the slider is locked, the trigger block will not spring back and jam the probe, allowing for unobstructed removal. Furthermore, the aforementioned parts are made of self-lubricating and wear-resistant materials (such as POM, nylon, or stainless steel) and have undergone fatigue life verification to ensure normal unlocking even after long-term locking. The first swing arm 4-32 and the second swing arm 4-33 are connected by a hinge, and the hinge can transmit motion in both directions. When the base 4-41 retracts under the action of the first spring 4-6, the push block 4-5 drives the push rod 4-34 to pull the second swing arm 4-33, thereby causing the first swing arm 4-32 and the U-shaped block 4-31 to drive the slide bar 4-1 to reset.

[0041] Understandably, this embodiment addresses the problem of insufficient displacement during probe insertion, which is too small to directly drive the locking unit, by using the stroke amplification unit 4-3. The dual-rocker mechanism amplifies the minute trigger displacement to a stroke sufficient for reliable locking unit operation. Furthermore, the stroke amplification unit 4-3 employs a hinged and sliding fit, resulting in high transmission efficiency and minimal frictional loss between the moving parts.

[0042] In one feasible implementation, such as Figure 4-6As shown, the locking unit 4-4 includes a base 4-41, a linkage block 4-49, at least two lock cylinders 4-42, a connecting rod 4-43, a fixing sleeve 4-44, a second spring 4-45, a locking rod 4-46, and a lock body 4-47. The base 4-41 has a convex cross-section, with a through hole extending axially through its center. An annular groove communicating with the through hole is also provided inside the base 4-41. Sliding holes communicating with the interior of the annular groove are provided on opposite sides of the base 4-41. The linkage block 4-49 is located on the outer surface of the base 4-41 and is slidably connected to the side plate. The linkage block is also fixedly connected to the push block 4-5. When the push block 4-5 pushes the linkage block 4-49 to slide, it causes the base 4-41 to move closer to and further away from the cover plate. The base 4-41 can only slide along the side plate 1-1 and cannot detach from the side plate; two lock cylinders 4-42 are set in the annular groove, and the lock cylinders 4-42 can slide radially along the annular groove. The lock cylinders 4-42 have a wedge-shaped structure; each lock cylinder 4-42 is provided with a connecting rod 4-43, which passes through the sliding hole; a fixing sleeve 4-44 is set on the outer wall of the base 4-41, and the fixing sleeve 4-44 is set for each sliding hole; a second spring 4-45 is set between the inner wall of the connecting rod 4-43 and the fixing sleeve 4-44; one end of the lock rod 4-46 is set in the through hole, and the other end of the lock rod 4-46 passes through the cover plate 1-3; the lock body 4-47 is set in the through hole, and the lock body 4-47 is sleeved on the lock rod 4-46. The lock body 4-47 is frustum-shaped.

[0043] In this technical solution, the locking rod 4-46 is fixedly connected to the cover plate 1-3, and the base 4-41 is sleeved on the outside of the locking rod 4-46 and can slide relative to it; the lock body 4-47 is an independent frustum-shaped part, which is sleeved on the locking rod 4-46, and its outer conical surface matches the wedge-shaped surface of the lock cylinder 4-42. Linkage blocks 4-49 are provided on both sides of the base 4-41. The linkage blocks 4-49 correspond to the positions of the push blocks 4-5, and the linkage blocks 4-49 are also slidably connected to the inner wall of the side plate 1-1; when the push blocks 4-5 slide in a direction closer to or further away from the cover plate 1-3, the linkage blocks 4-49 push the base 4-41 to move axially along the locking rod 4-46. When the push block 4-5 reaches its second stroke, it directly pushes the linkage block 4-49, causing the base body 4-41 to move. As the base body 4-41 moves, the lock cylinder 4-42 within its annular groove moves along with it. The wedge-shaped surface of the lock cylinder 4-42 slides relative to the frustum surface of the lock body 4-47, forcing the lock cylinder 4-42 to move radially outward. When the lock cylinder 4-42 slides to the stepped surface of the lock body 4-47, the second spring 4-45 releases, pushing the lock cylinder 4-42 radially inward to reset and engage behind the stepped surface, thus achieving locking. Alternatively, the lock body 4-47 can also be integrally formed with the lock rod 4-46.

[0044] Understandably, this locking unit achieves mechanical self-locking through the cooperation of the wedge-shaped lock cylinder 4-42 and the frustum-shaped lock body 4-47, combined with the energy release of the second spring 4-45: when the lock cylinder 4-42 slides past the frustum surface of the lock body and falls behind the stepped surface, the second spring pushes the lock cylinder to radially reset, forming a reliable lock. At this time, even if the cover plate 1-3 is pulled, a self-locking force will be generated between the lock cylinder 4-42 and the stepped surface of the lock body to ensure that the cover plate 1-3 can be tightly connected to the side plate 1-1. In addition, this solution uses an independent frustum-shaped lock body, which can be adapted to different locking stroke requirements by replacing lock bodies with different tapers or step heights. Therefore, the locking unit disclosed in this solution achieves the safety effect of insertion and locking, self-locking and anti-disengagement in a purely mechanical way, providing a more reliable forced locking for the cover plate 1-3 than elastic locking.

[0045] The locking unit 4-4 also includes an unlocking sleeve 4-48, which is sleeved on the locking rod 4-46. The unlocking sleeve 4-48 is threadedly connected to the locking rod 4-46, and the unlocking sleeve 4-48 is slidably connected to the cover plate 1-3.

[0046] In this technical solution, the outer wall of the unlocking sleeve 4-48 can be provided with knurling or anti-slip grooves for easy manual twisting. When it is necessary to unlock the cover plate, the operator rotates the unlocking sleeve 4-48 in the unlocking direction, and the unlocking sleeve 4-48 moves axially along the locking rod 4-46 through threaded transmission. The end of the unlocking sleeve 4-48 is provided with a first conical surface, and the inner side of the lock cylinder 4-42 is provided with a second conical surface. When the unlocking sleeve moves axially, the first conical surface and the second conical surface slide relative to each other, forcing the lock cylinder to move radially outward, thereby exiting the stepped surface of the lock body 4-47. At this time, the base body 4-41 can return to its original position under the restoring force of the first spring, and the cover plate 1-3 returns to the detachable state.

[0047] Understandably, this solution provides a safe and controllable manual unlocking method by setting the unlocking sleeve 4-48. The unlocking sleeve 4-48 requires active rotation to unlock and cannot be triggered by accidental touch or vibration, thus avoiding accidental unlocking of the cover 1-3 during equipment operation due to misoperation. Maintenance personnel can twist the unlocking sleeve by hand without carrying special disassembly tools, improving maintenance efficiency. Moreover, the operator can only manually unlock the device through the unlocking sleeve if both probes have been pulled out. If the probes are not pulled out, the push block is still in the push position, and the base 4-41 cannot be reset. At this time, even if the unlocking sleeve is rotated, it cannot be completely unlocked due to internal interference, forming a double protection. Therefore, in this solution, the unlocking sleeve 4-48 works in conjunction with the locking unit to realize the safety logic of automatic locking and manual unlocking, ensuring forced locking during the measurement process and meeting the need for normal opening of the cover during maintenance.

[0048] In one feasible embodiment, the insulating housing 1 further includes an outer expansion plate 1-4, which is respectively inclined outwardly at one end of the side plate 1-1 and the bottom plate 1-2, and the three outer expansion plates 1-4 form a flared opening for accommodating external cable terminals.

[0049] In this technical solution, the outer expansion plate 1-4 is an extension of the rear section of the side plate 1-1 and the bottom plate 1-2, formed by outward bending through a hot bending process. The material is the same as the shell (e.g., PC board). Alternatively, the outer expansion plate 1-4 can be integrally injection molded with the shell, or it can be connected by separate bonding or ultrasonic welding. The angle between the outer expansion plate 1-4 and the corresponding side plate 1-1 and bottom plate 1-2 is 135°-140°. This angle range ensures that cables and terminals can smoothly enter and exit while preventing the outer expansion plate from being excessively opened and interfering with the protective tools for other phase lines.

[0050] Understandably, the flared design effectively accommodates external cable terminals and cable cores, preventing compression or excessive bending of the cable. It also increases internal space, promoting heat dissipation and airflow. Compared to the cumbersome process of cutting notches according to the core size required for horn-shaped sleeves, the flared design can directly adapt to cables of different diameters, offering greater versatility.

[0051] In one feasible implementation, the busbar protection tool also includes a thermal sticker 3, which is disposed on the side plate 1-1 and is used to monitor the temperature of the busbar.

[0052] In this technical solution, the thermal sticker 3 uses a commercially available reversible thermal sticker with a recommended temperature sensing range of 40℃-120℃. For example, multi-range color-changing stickers with temperature ranges of 40℃, 60℃, 80℃, and 100℃ can be selected. As an alternative, irreversible temperature-measuring stickers (recording the highest temperature), LCD digital temperature patches, or embedded miniature digital temperature sensors (in conjunction with an external reading instrument) can be used. The thermal sticker 3 is affixed to the outer surface of side plate 1-1, corresponding to the location near the internal L-shaped copper busbar connection point. To ensure that the temperature of the copper busbar can be accurately transferred to the thermal sticker 3, a heat-conducting block can be set on the inner side of side plate 1-1. The position of the heat-conducting block corresponds to the position of the thermal sticker 3. The heat-conducting block is used to transfer the heat of the busbar to the thermal sticker 3. The heat-conducting block (optional) is made of non-conductive thermally conductive material (such as a thermally conductive silicone pad), adheres to the surface of the busbar, and conducts heat to the thermal sticker through openings on the side plate or direct contact.

[0053] Understandably, with the thermal sticker 3, routine inspection personnel can intuitively determine whether there is abnormal overheating at the L-shaped copper busbar connection point simply by observing color changes, without any instruments or meters. This overcomes the shortcomings of existing horn-shaped sleeves, which are made of non-transparent material and cause blind spots during inspection. It can promptly detect potential overheating hazards caused by poor contact or overload, preventing equipment accidents.

[0054] In this invention, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "link" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0055] In the description of this invention, it should be understood that the terms "upper," "lower," "left," "right," "front," "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0056] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0057] The above are merely preferred embodiments of the present invention and are not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A busbar protection tool, characterized in that, include: An insulating housing having an internal cavity for enclosing the busbar and external cable terminals; Multiple voltage measurement holes are provided in the insulating housing. When a voltage measurement probe is inserted into one of the voltage measurement holes, the voltage of the busbar can be measured.

2. The busbar protection tool according to claim 1, characterized in that, The insulating housing includes: The side plate is L-shaped, and two side plates are arranged opposite to each other. The voltage measurement holes are arranged in a rectangular array on the side plate. A base plate, which is L-shaped, is disposed on one side of the two side plates and is used to connect the two side plates. The cover plate is L-shaped and is detachably mounted on the other side of the two side plates.

3. The busbar protection tool according to claim 2, characterized in that, Also includes: A card strip, wherein the card strip is disposed on the side plate and the card strip is provided with a card slot; A snap-fit ​​component is disposed on the cover plate and is elastically snapped into the slot.

4. The busbar protection tool according to claim 2, characterized in that, Also includes: A cover plate locking assembly is disposed inside the insulating housing. When the voltage measuring probe is inserted into the voltage measuring hole, the cover plate locking assembly can be triggered to lock the cover plate.

5. The busbar protection tool according to claim 4, characterized in that, The cover plate locking assembly includes: Multiple sliders are provided, and the inner side of the side plate is provided with multiple parallel sliding grooves. The sliding grooves are perpendicular to the cover plate. The multiple sliders are slidably disposed on the inner side of the side plate and can slide along the direction of approaching and moving away from the cover plate. Multiple trigger blocks are provided along the length of each slider, and each voltage measurement hole corresponds to one trigger block. Each trigger block is provided with an inclined surface extending along the axial direction of the voltage measurement hole. When the voltage measurement probe is inserted into the voltage measurement hole, it contacts the inclined surface and pushes the slider to slide. A stroke amplification unit is provided on each of the sliders, and the stroke amplification unit is used to amplify the first stroke of the slider to a second stroke; A push block, wherein the push block is disposed at the end of the plurality of stroke amplification units; A locking unit is disposed on the inner side of the cover plate. One side of the locking unit is fixedly connected to the push block. When the stroke amplification unit generates the second stroke, it drives the push block to slide and triggers the locking unit to act, thereby locking the cover plate. Multiple first springs are provided, with one first spring between each slider and the inner wall of the corresponding groove. The first spring is used to drive the slider to reset when unlocked and to maintain compressed energy storage when locked.

6. The busbar protection tool according to claim 5, characterized in that, The stroke amplification unit includes: U-shaped block, the U-shaped block being disposed on the slider; A first pendulum rod, which is hinged to the U-shaped block; The second pendulum arm is hinged to the first pendulum arm; A push rod, wherein the push rod is disposed on the second swing arm; A fixing block is disposed on the inner wall of the side plate, and the push rod passes through the fixing block and is slidably connected to the fixing block; The push block is fixedly connected to the plurality of push rods.

7. The busbar protection tool according to claim 6, characterized in that, The locking unit includes: The substrate has a convex cross-section, a through hole extending through its axial direction at its center, an annular groove communicating with the through hole inside the substrate, and sliding holes communicating with the interior of the annular groove on opposite sides of the substrate. A linkage block is disposed on the outer side of the base body. The linkage block is slidably connected to the side plate and fixedly connected to the push block. When the push block pushes the linkage block to slide, it causes the base body to slide along the direction of approaching and moving away from the cover plate. At least two lock cylinders are disposed within the annular groove, the lock cylinders are capable of sliding radially along the annular groove, and the lock cylinders have a wedge-shaped structure; A connecting rod is provided on each of the lock cylinders, and the connecting rod passes through the sliding hole; A fixing sleeve is disposed on the outer side wall of the base, and the fixing sleeve is provided for each of the sliding holes; A second spring is disposed between the connecting rod and the inner wall of the fixed sleeve; A locking rod, one end of which is disposed in the through hole, and the other end of which passes through the cover plate; The lock body is disposed in the through hole and sleeved on the lock rod. The lock body is shaped like a frustum.

8. The busbar protection tool according to claim 7, characterized in that, Also includes: An unlocking sleeve is fitted onto the locking rod, the unlocking sleeve is threadedly connected to the locking rod, and the unlocking sleeve is slidably connected to the cover plate.

9. The busbar protection tool according to claim 2, characterized in that, The insulating housing further includes: Outer expansion plates are respectively inclined outwards at one end of the side plate and the bottom plate, and the three outer expansion plates form a flared opening for accommodating external cable terminals.

10. The busbar protection tool according to claim 2, characterized in that, Also includes: A thermal sticker is disposed on the side plate and is used to monitor the temperature of the busbar.

Images