10kv kyn switch cabinet internal maintenance auxiliary tool and maintenance method

Abstract

The present application relates to the technical field of auxiliary tools for internal maintenance of switch cabinets, and particularly relates to a 10-kilovolt KYN switch cabinet internal maintenance auxiliary tool and a maintenance method. The tool comprises at least one set of support units, each of which comprises a support plate and an attachment plate fixedly connected to the support plate; at least one set of width adjustment mechanisms, each of which comprises a fixed outer shaft and a movable core shaft in sliding fit with the fixed outer shaft, one end of the movable core shaft being connected to the support plate and the other end being provided with a roller; an upper push plate and a lower push plate mounted on the support plate, the upper push plate and the lower push plate being used to contact and unlock a valve locking mechanism in the switch cabinet; and a locking mechanism used to lock the relative position of the movable core shaft and the fixed outer shaft. The present application fundamentally eliminates the risk of injury caused by accidental return of the valve in the traditional operation, and significantly improves the safety of the maintenance operation.

Description

Technical Field

[0001] This invention relates to the field of auxiliary tools for internal maintenance of switchgear, and particularly to an auxiliary tool and maintenance method for internal maintenance of a 10 kV KYN switchgear. Background Technology

[0002] As a key power distribution device in power systems, the 10kV KYN series switchgear typically incorporates a valve mechanism to isolate energized parts during maintenance, preventing accidental electric shock. To enhance safety, most valve mechanisms are now equipped with mechanical interlocking devices. This interlocking structure ensures the valve cannot be opened while the equipment is energized, effectively protecting the safety of operators.

[0003] However, while this mechanical interlocking design enhances safety, it also introduces new challenges for maintenance work during power outages. When cleaning the cabinet, inspecting the stationary contact box, or testing wiring is required after a busbar power outage, maintenance personnel cannot directly push open the valve. They must simultaneously operate the unlocking mechanism and hold the valve in place to enter the cabinet. Due to the confined space inside the cabinet, the valve's elastic reset function, and the considerable distance between the upper valve and the unlocking plate, two people are typically required to operate it: one to unlock and support the valve, and the other to perform the maintenance work. This method is not only inefficient but also poses a risk of injury due to the continuous manual support required for the valve. Furthermore, it increases the number of personnel required for cabinet work and the coordination difficulties, hindering the standardization and normalization of on-site operations.

[0004] Currently, there is no dedicated maintenance tool in the industry that can adapt to different cabinet widths, be compatible with various door structures, and enable safe and quick operation by a single person. Summary of the Invention

[0005] This invention provides an auxiliary tool and method for internal maintenance of a 10 kV KYN switchgear. See the description below for details: An auxiliary tool for internal maintenance of a 10 kV KYN switchgear includes: At least one set of support units, each support unit comprising a support plate and an attachment plate fixedly connected to it; At least one width adjustment mechanism, the width adjustment mechanism including a fixed outer shaft and a movable spindle that slides with it, one end of the movable spindle being connected to the support plate and the other end being provided with a roller; An upper push plate and a lower push plate are mounted on the support plate, which are used to contact and unlock the door locking mechanism inside the switch cabinet; And a locking mechanism, the locking mechanism including a shaft support, the shaft support being sleeved on the fixed outer shaft for connecting two adjacent fixed outer shafts.

[0006] Preferably, the movable spindle has an elongated hole extending along its axial direction. The other end of the movable spindle is slidably engaged with the fixed outer shaft and connected to the shaft support, and then locked by a lock nut. The locking mechanism also includes a locking member that passes through the fixed outer shaft and selectively engages with one end or the other end of the elongated hole, as well as a pressure handle for driving the locking member.

[0007] Preferably, the auxiliary plate is provided with a cabinet locking assembly, which includes a retractable tongue plate, a spring that drives the tongue plate to move in the extension direction, and a retractable handle connected to the tongue plate for controlling its extension and retraction.

[0008] Preferably, the support plate is detachably connected to the upper push plate and the lower push plate; the support plate and / or the upper push plate and the lower push plate are provided with at least two different connection holes, A hole and B hole, to accommodate switch cabinet doors of different sizes.

[0009] Preferably, the upper push plate and the lower push plate are quickly locked to the support plate by a ratchet locking handle, and / or fixedly connected by a pre-placed wire on the support plate.

[0010] Preferably, the width adjustment mechanism, support unit and push plate are all set in two groups and arranged symmetrically along the axial direction of the fixed outer shaft to form a frame structure that can be laterally supported between the two side plates of the switch cabinet.

[0011] A method for performing internal maintenance of a switchgear using the aforementioned auxiliary tool includes the following steps: S1: Adjust the width adjustment mechanism according to the width of the switch cabinet to be inspected, so that the overall width of the tool matches the width of the cabinet, and lock it by the locking mechanism; S2: Push the tool into the switch cabinet, so that the rollers roll along the bottom of the cabinet until the upper push plate and the lower push plate contact the door locking mechanism; S3: Continue to advance the tool to unlock and open the upper and lower doors of the switch cabinet through the upper and lower push plates; S4: Operate the cabinet locking component on the tool to fix the tool to the switch cabinet, thereby keeping the door in the open position; S5: Perform cabinet cleaning, wiring tests, and maintenance.

[0012] Preferably, in step S1, if the switch cabinet is 800mm wide, the movable spindle is adjusted so that the first end of the elongated hole engages with the locking member; if the switch cabinet is 1000mm wide, the movable spindle is adjusted so that the second end of the elongated hole engages with the locking member.

[0013] Preferably, before step S1, step S0 is included: selecting, according to the model of the switch cabinet door, to install the upper push plate and the lower push plate onto the A hole or B hole on the support plate.

[0014] The beneficial effects of the technical solution provided by this invention are as follows: The 10kV KYN switchgear internal maintenance auxiliary tool provided by this invention, through the cooperation of an adjustable-width support frame and a specially designed push plate, enables a single person to safely and conveniently unlock and reliably fix the locking mechanism of various switchgear valves. This fundamentally eliminates the risk of pinching injuries caused by accidental valve descent in traditional operations, significantly improving the safety of maintenance work. The tool has a quick-adjustment function for width and mounting hole positions, achieving universality across different cabinet widths and valve models, such as 800mm and 1000mm. This avoids the cumbersome and costly process of equipping different cabinet types with specialized tools, greatly improving the efficiency and standardization of maintenance work, while reducing the number of personnel required for collaborative work inside the cabinet and optimizing working conditions in confined spaces. Attached Figure Description

[0015] Figure 1 This is the main view of the auxiliary tool of the present invention; Figure 2 This is a left view of the auxiliary tool of the present invention; Figure 3 This is a top view of the auxiliary tool of the present invention; Figure 4 This is a three-dimensional schematic diagram of the application state of the auxiliary tool of the present invention when it is adapted to an 800mm wide switch cabinet; Figure 5 This is a schematic diagram of the movable mandrel in this invention; Figure 6 This is a three-dimensional schematic diagram of the application state of the auxiliary tool of the present invention when it is adapted to a 1000mm wide switch cabinet.

[0016] Explanation of the labels in the diagram: 1-Upper push plate, 2-Lower push plate, 3-Hole A, 4-Hole B, 5-Ratchet locking handle, 6-Support plate, 7-Moving spindle, 8-Fixed outer shaft, 9-Pressure handle, 10-Shaft support, 11-Locking nut, 12-Attached plate, 13-Roller, 14-Telescopic handle, 15-Spring, 16-Ling plate, 17-Long hole. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0018] The core of the 10 kV KYN switchgear internal maintenance auxiliary tool provided by this invention lies in constructing a rigid support frame with adjustable width and depth. This frame can be stably supported inside the switchgear, and a specially designed push plate assembly is used to achieve safe unlocking and reliable fixation of the door locking mechanism.

[0019] like Figures 1 to 4 As shown, this tool mainly includes two sets of support units arranged symmetrically, a width adjustment mechanism connected between them, a push plate assembly installed on the support unit, and a locking mechanism for fixing.

[0020] The support unit mainly includes a support plate 6 and an attached plate 12 welded to it. The support plate 6 serves as the main load-bearing and mounting base, and its front end (near the cabinet door) is used to install the push plate assembly.

[0021] The width adjustment mechanism is key to adapting the tool to different cabinet widths. It includes a fixed outer shaft 8 and two sliding mandrels 7, inserted from both ends of the fixed outer shaft 8. The other end of each mandrel 7 slides with the fixed outer shaft 8 and is connected to a shaft support 10, then locked by a lock nut 11. Rollers 13 are mounted on the outer ends of the mandrels 7 to facilitate tool movement within the cabinet. Elongated holes 17 extending axially are machined into the shaft of each mandrel 7. A corresponding clamping handle 9 is mounted on the fixed outer shaft 8, driving a locking pin (not shown separately in the figure). When the tool needs to adapt to cabinets of different widths, the two side support units are pulled outwards, causing the mandrels 7 to withdraw from the fixed outer shaft 8. After the rollers 13 contact the cabinet sidewall, the clamping handle 9 is pressed down, causing the locking pin to engage with the corresponding end of the elongated hole 17 on the mandrel 7 (e.g., one end for an 800mm cabinet width, the other for a 1000mm cabinet width), quickly locking the tool's support width.

[0022] The push plate assembly includes an upper push plate 1 and a lower push plate 2. They are mounted on specific holes at the front end of a support plate 6 via bolts or quick-locking devices (such as a ratchet locking handle 5). The support plate 6 has at least two sets of mounting holes, namely hole A 3 and hole B 4, corresponding to different depths (or sizes) of the valve mechanisms. For example, for smaller valve mechanisms (e.g., 800mm wide outgoing cabinets and 1000mm wide PT cabinets), the push plate is mounted on hole A 3; for larger valve mechanisms (e.g., 1000mm wide receiving cabinets), it is mounted on hole B 4. This design ensures that the push plate can accurately act on the unlocking parts of different valve models.

[0023] To further ensure the stability of the tool within the cabinet, a cabinet locking assembly is also provided on the auxiliary plate 12. This assembly includes a tongue plate 16 that can extend and retract within the guide groove of the auxiliary plate 12, a spring 15 that provides outward elastic force to the tongue plate 16, and a telescopic handle 14 for manually controlling the retraction of the tongue plate 16. After the tool is pushed into the appropriate position inside the cabinet, the telescopic handle 14 is released, and the tongue plate 16 pops out under the action of the spring 15 and presses against the upright or panel inside the switch cabinet, preventing the tool from moving back and forth during operation.

[0024] The usage instructions for this tool are as follows: First, adjust the width of the tool according to the width of the switch cabinet to be inspected (e.g., 800mm or 1000mm): pull the two side support units outward until the roller 13 position matches the cabinet width, and then press down the clamping handle 9 to lock it.

[0025] Secondly, depending on the model of the cabinet door, select to install the upper push plate 1 and the lower push plate 2 onto the A hole 3 or B hole 4 of the support plate 6, and lock them with the ratchet lock handle 5.

[0026] Then, grasp the fixed outer shaft 8 or support part in the middle of the tool and push the tool horizontally into the de-energized switch cabinet. The roller 13 makes the pushing process effortless and smooth.

[0027] When the push plate contacts and presses against the mechanical locking baffle of the valve, continuing to apply force will simultaneously unlock the valve and push the upper and lower valves to their maximum open positions.

[0028] Finally, operate the telescopic handles 14 on both side plates 12 to release the tongue plate 16, causing it to press against the internal structure of the cabinet, thus firmly fixing the entire tool together with the opened door. At this point, maintenance personnel can release the tool and safely perform operations such as cleaning the stationary contact box inside the cabinet and testing wiring, without worrying about the door accidentally falling back down.

[0029] After the work is completed, first pull back the telescopic handle 14 to retract the tongue plate 16, and then pull the tool out of the cabinet. Through this method, the present invention enables a single person to safely, efficiently, and in a standardized manner complete internal maintenance work on various models of 10kV KYN switchgear.

[0030] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An auxiliary tool for internal maintenance of a 10 kV KYN switchgear, characterized in that, include: At least one set of support units, the support unit including a support plate (6) and an auxiliary plate (12) fixedly connected thereto. At least one width adjustment mechanism, the width adjustment mechanism includes a fixed outer shaft (8) and a movable spindle (7) that slides with it, one end of the movable spindle (7) is connected to the support plate (6), and the other end is provided with a roller (13). An upper push plate (1) and a lower push plate (2) are installed on the support plate (6), and the upper push plate (1) and the lower push plate (2) are used to contact and unlock the door locking mechanism inside the switch cabinet; And a locking mechanism, the locking mechanism including a shaft support (10), the shaft support (10) being sleeved on the fixed outer shaft (8) for connecting two adjacent fixed outer shafts (8). The movable spindle (7) has an elongated hole (17) extending along its axial direction. The other end of the movable spindle (7) is slidably engaged with the fixed outer shaft (8) and connected to the shaft support (10) and locked by a lock nut (11). The locking mechanism also includes a locking member that passes through the fixed outer shaft (8) and selectively engages one end or the other end of the elongated hole (17), as well as a pressure handle (9) for driving the locking member. The attached plate (12) is provided with a cabinet locking assembly, which includes a retractable tongue plate (16), a spring (15) that drives the tongue plate (16) to move in the extension direction, and a telescopic handle (14) connected to the tongue plate (16) for controlling its extension and retraction. When the tool needs to adapt to cabinets of different widths, the two side support units are pulled outward, and the moving spindle (7) is pulled out from the fixed outer shaft (8). After the roller (13) contacts the side wall of the cabinet, the clamping handle (9) is pressed down, so that the locking pin is engaged with the corresponding end of the long hole (17) on the moving spindle (7), which can quickly lock the support width of the tool. When the tool is pushed into the appropriate position in the cabinet, the telescopic handle (14) is released, and the tongue plate (16) pops out under the action of the spring (15) and presses against the column or plate inside the switch cabinet to prevent the tool from moving back and forth during operation. The support plate (6) is detachably connected to the upper push plate (1) and the lower push plate (2); the support plate (6) and / or the upper push plate (1) and the lower push plate (2) are provided with at least two different connection holes to accommodate switch cabinet doors of different sizes.

2. The auxiliary tool for internal maintenance of a 10 kV KYN switchgear according to claim 1, characterized in that: The upper push plate (1) and the lower push plate (2) are quickly locked to the support plate (6) by a ratchet locking handle (5) and / or fixedly connected by a pre-placed wire on the support plate (6).

3. The auxiliary tool for internal maintenance of a 10 kV KYN switchgear according to claim 1, characterized in that: The width adjustment mechanism, support unit and push plate are all set in two groups and arranged symmetrically along the axis of the fixed outer shaft (8) to form a frame structure that can be horizontally supported between the two side plates of the switch cabinet.

4. A method for internal maintenance of a switchgear using the auxiliary tools described in any one of claims 1-3, characterized in that, Includes the following steps: S1: Adjust the width adjustment mechanism according to the width of the switch cabinet to be inspected, so that the overall width of the tool matches the width of the cabinet, and lock it by the locking mechanism; S2: Push the tool into the switch cabinet and make the roller (13) roll along the bottom of the cabinet until the upper push plate (1) and the lower push plate (2) contact the door locking mechanism; S3: Continue to advance the tool to unlock and open the upper and lower doors of the switch cabinet through the upper push plate (1) and the lower push plate (2); S4: Operate the cabinet locking component on the tool to fix the tool to the switch cabinet, thereby keeping the door in the open position; S5: Perform cabinet cleaning, wiring tests, and maintenance.

5. The method according to claim 4, characterized in that, In step S1, if the switch cabinet is 800mm wide, the movable spindle (7) is adjusted so that the first end of the elongated hole (17) engages with the locking member; if the switch cabinet is 1000mm wide, the movable spindle (7) is adjusted so that the second end of the elongated hole (17) engages with the locking member.

6. The method according to claim 4, characterized in that, Before step S1, step S0 is also included: according to the model of the switch cabinet door, select to install the upper push plate (1) and the lower push plate (2) to the A hole (3) or B hole (4) on the support plate (6).

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