Rapid assembly and disassembly device for low-voltage side fuse of station transformer

Abstract

The invention relates to the field of electric power tools, and discloses a station transformer low-voltage side fuse rapid assembling and disassembling device, which comprises at least one clamping structure, an electric transmission system and a fuse grabbing and releasing system, and is characterized in that the clamping structure is connected to an insulating hood and is used for integrally clamping and positioning the device on a base near a fuse static contact; the electric transmission system is arranged in the insulating hood and is used for providing axial propelling and pulling force; the fuse grabbing and releasing system is connected to the output end of the electric transmission system and used for grabbing and releasing a fuse. The electric tool has the beneficial effects that the clamping structure is arranged, so that the defect that a traditional electric tool cannot work independently and reliably due to no stable force exerting mechanism is overcome, the problem that an extraction tool is prone to being damaged due to uneven stress is solved through an electric transmission system, operation reliability is improved, and the service life of equipment is prolonged; the fuse grabbing and releasing system realizes safe distance isolation between an operator and an electrified busbar and a fuse body.

Description

Technical Field

[0001] This invention relates to the field of power tools, and more specifically to a quick-installation and removal device for the low-voltage side fuse of a station transformer. Background Technology

[0002] During power outage maintenance of substation service transformers, the high-capacity fuses on their low-voltage side need to be installed and removed. Traditionally, maintenance personnel use pullers and insulated gloves to manually install and remove fuses within the confined space of the fuse box, repeatedly adjusting angles and points of force. Because the fuses and base contacts are tightly interlocked, and the space inside the box is limited with small busbar spacing, this operation is not only time-consuming and labor-intensive but also requires significant arm strength. While there have been attempts at electrification in existing technologies, the special structure of the fuse's stationary contacts and the lack of stable mounting points within the box make it difficult for electric actuators to apply direct force. Manual positioning and adjustment are still often required, preventing truly efficient and stable automated installation and removal.

[0003] The current methods for installing and removing fuses on the low-voltage side of station service transformers have the following shortcomings: First, the puller is prone to damage due to uneven force, resulting in poor operational reliability; second, personnel must be in close contact with the fuse and busbar during operation, posing a risk of electric arc injury. Particularly noteworthy is the lack of a stable force-bearing mechanism that matches the fuse holder, making it impossible to establish a reliable lever fulcrum in confined spaces. This leads to slippage and deviation during electric advancement, still requiring manual intervention and failing to fundamentally achieve safe, efficient, and universally applicable rapid installation and removal of fuses. Summary of the Invention

[0004] The technical problem to be solved by this invention is that existing installation and removal devices are prone to slippage and displacement during operation, and still require manual intervention, failing to fundamentally achieve safe and efficient installation and removal of fuses. The purpose is to provide a fast installation and removal device for the low-voltage side fuse of a station transformer, so as to achieve safe, efficient and reliable installation and removal of fuses.

[0005] This invention is achieved through the following technical solution:

[0006] A quick-release device for low-voltage side fuses of a station service transformer includes at least one clamping structure, an electric drive system, and a fuse gripping and releasing system. The clamping structure is connected to an insulating cover and is used to clamp and position the entire device on a base near the stationary contact of the fuse. The electric drive system is disposed inside the insulating cover and is used to provide axial pushing and pulling forces. The fuse gripping and releasing system is connected to the output end of the electric drive system and is used to grip and release the fuse.

[0007] The beneficial effects of this invention are as follows: First, by setting up a clamping structure, a stable force point is provided for the entire device to firmly connect with the stationary contact base within the narrow fuse box, thus constructing a reliable lever fulcrum. This completely eliminates the problems of uneven force application and the need for manual intervention caused by slippage and displacement of the entire device during electric propulsion. This directly overcomes the shortcomings of traditional power tools, which cannot work independently and reliably due to the lack of a stable force-bearing mechanism, ensuring operational stability and versatility. Second, the electric transmission system replaces manual labor to provide precise and controllable axial propulsion and pull-out forces. This not only greatly reduces the physical burden on operators but also avoids angular deviations and impact loads during manual operation through mechanical transmission. This fundamentally solves the problem of the puller being easily damaged due to uneven force, improving operational reliability and equipment lifespan. Finally, the fuse grabbing and releasing system is linked with the electric drive system, enabling the operator to complete the entire process of grabbing, installing, removing and releasing the fuse through electrical control from behind the safety barrier of the insulated enclosure. This achieves a safe distance isolation between the operator and the live busbar and the fuse body, thereby completely eliminating the risk of electric arc injury faced by maintenance personnel due to close-range operation.

[0008] In some embodiments, the clamping structure includes an operating handle extending from the insulating cover, a first gripper and a second gripper disposed opposite to each other, and a linkage mechanism. The linkage mechanism includes a first link and a second link. The apex of the triangle of the first link is hinged to the insulating cover via a pivot, and the two bottom corners are respectively hinged to the inner side of the lower end of the operating handle and the upper end of the second link. The lower end of the second link is hinged to the outer side of the upper end of the second gripper, and the inner side of the upper end of the second gripper is hinged to the insulating cover. The lower end of the operating handle is hinged to the outer side of the upper end of the first gripper, and the inner side of the upper end of the first gripper is hinged to the insulating cover. When the operating handle is turned, the compound linkage mechanism precisely converts the swing motion of the handle into the opposing or opposite linear motion of the first and second grippers. This allows the device to firmly and adaptively clamp onto the stationary contact of the fuse and the lower base, forming a rigid and immovable lever fulcrum in a narrow space. This solves the slippage and offset problems caused by the lack of a stable force point in existing power tools, providing a stable and reliable foundation for subsequent electric assembly and disassembly, and enabling the device to work independently without manual support.

[0009] In some embodiments, the clamping structure further includes a positioning baffle disposed at the lower end of the insulating cover. The positioning baffle has an operating groove for mounting a fuse in its center. The positioning baffle abuts against the mounting structure for mounting the fuse when the first and second grippers are clamped on the fuse base. By adding a positioning baffle with an operating groove to the lower end of the insulating cover based on the clamping structure, when the first and second grippers are clamped on the fuse base, the positioning baffle can simultaneously abut against the mounting structure (such as a housing panel) for mounting the fuse. This combines the clamping force with the abutment support force, further constraining the displacement freedom of the device in three-dimensional space. This forms a more stable three-point positioning or surface contact support system, enhancing the device's resistance to torsion and overturning when subjected to large axial thrust or tension applied by the electric drive system. It avoids uneven stress and damage to the fuse or base contacts caused by slight device displacement, greatly improving operational reliability and safety.

[0010] In some embodiments, the electric drive system includes a drive motor and a gearbox. The gearbox is assembled from a lower gearbox housing and an upper gearbox housing. The drive motor is mounted on the gearbox, and the output shaft is connected to the mounting shaft via a coupling. A drive gear is mounted on the mounting shaft. A transmission screw is fixedly connected to the top of the insulating cover. The threaded end of the transmission screw is screwed into the center of the main gear inside the gearbox. The main gear meshes with the drive gear. When the drive motor is rotating, the electric drive system moves up and down along the transmission screw. An electric transmission system consisting of a drive motor, a gearbox, and a lead screw fixed to the top of the insulating housing is adopted. The drive gear meshes with the main gear, and the center of the main gear is screwed to the threaded end of the lead screw. This allows the rotational motion of the drive motor to be reduced and amplified by the gear pair, and then converted into the precise linear motion of the gearbox (and its connected components) along the fixed lead screw. This eliminates the need for a flexible transmission mechanism (such as a long shaft) between the drive motor and the moving parts, greatly simplifying the layout within the narrow insulating housing. This achieves a highly compact and lightweight transmission system. At the same time, the self-locking and high precision of the lead screw drive itself make the speed and force of pushing and pulling controllable and smooth, solving the problem of damage to the puller due to uneven subjective force applied by the user, and ensuring the accuracy of the fuse installation and removal position.

[0011] In some embodiments, the electric drive system further includes a first driven gear and a second driven gear. Both the first and second driven gears are mounted in the gearbox via corresponding mounting shafts and mesh with the main gear. The first and second driven gears are located on the side of the main gear away from the drive gear and are symmetrical about a virtual line connecting the centers of the main gear and the drive gear. Because the first and second driven gears are added to the gear drive system with the line connecting the centers of the main gear and the drive gear as the axis of symmetry, and both mesh with the main gear, the torque of the drive motor, after being transmitted to the main gear through the drive gear, is symmetrically distributed to the first and second driven gears. This symmetrical multi-gear distribution structure allows the radial forces acting on the main gear and its centrally screwed transmission screw to be balanced and canceled out, improving the stress state of the main gear and transmission screw, avoiding uneven loading, wear, or even jamming that may occur with unilateral meshing, and improving the operational stability, reliability, and lifespan of the entire electric drive system under long-term, heavy-load operation, ensuring the continuous stability and accuracy of the device's output force.

[0012] In some embodiments, the fuse gripping and releasing system includes an insulating base, a pressing insulating component, and a movable base. The movable base is connected to the inner side of the insulating base, and the insulating base can slide up and down along the inner side of the insulating cover. The insulating base is provided with several second safety retaining clips that cooperate with fuse end caps of corresponding specifications. The movable base is also provided with a first safety retaining clip. The insulating base is provided with a release hole coaxial with the first safety retaining clip. The housing of the gear transmission box is provided with a through hole. The pressing insulating component passes through the through hole and the release hole in sequence and can engage or disengage with the interface on the fuse end cap. The sliding engagement between the insulating fixed seat and the movable seat ensures that the gripping mechanism can move synchronously and precisely with the electric drive system. The first and second safety fixing clips reliably clamp the fuse end cap from both sides, ensuring that it will not come loose during the pushing or pulling process. In particular, the design of pressing the insulating component through the entire electric drive system to the fuse interface allows the operator to remotely control the locking and releasing of the fuse from outside the insulating cover, realizing physical isolation between the operator and the fuse / busbar during the installation and removal process, fundamentally eliminating the risk of electric arc injury from close-range operation.

[0013] In some embodiments, the press-and-insulate assembly includes a release handle, an insulating sleeve, and a spring. The spring is sleeved on the release handle to form a compression assembly, which is slidably located within the insulating sleeve. The pressing end of the release handle extends beyond the upper end of the insulating cover. The insulating sleeve passes sequentially through the electric drive system and the release hole. When the release handle is pressed down, the distal end of the release handle extends into the interface on the fuse cap. When the release handle is released, the distal end of the release handle disengages from the interface, and the spring provides a restoring force. Specifically defining the press-and-insulate assembly as including a release handle, an insulating sleeve, and a spring facilitates overcoming the spring force when the handle is pressed down, allowing the distal end of the handle to extend and engage with the interface for locking. When the handle is released, the distal end of the handle automatically retracts under the restoring force of the spring, disengaging from the interface to unlock. The insulating sleeve provides a complete insulation barrier for the entire moving assembly, making the fuse gripping and releasing operation simple, quick, reliable, and entirely under insulation protection.

[0014] In some embodiments, the movable seat is further provided with a connecting hole, and pin holes are provided on the side wall of the connecting hole and the lower end of the transmission screw. The lower end of the transmission screw is connected to the movable seat by the pin. This forms a detachable, rigid, and reliable connection between the movable seat and the output end of the transmission screw, which can withstand a certain bending moment. This not only ensures that the linear thrust of the electric drive system can be effectively and without loss transmitted to the movable seat and the fuse gripping mechanism, but also that its simple pin structure facilitates the installation, maintenance, and replacement of gripping components of different specifications, enhancing the practicality and adaptability of the device.

[0015] In some embodiments, the outer periphery of the movable seat is provided with at least two guide grooves, and the inner side of the insulating cover is provided with several protrusions that mate with the guide grooves. Because at least two guide grooves are provided on the outer periphery of the movable seat, forming a sliding fit with the corresponding protrusions on the inner side of the insulating cover, it is ensured that the movement trajectory of the movable seat remains strictly straight when subjected to axial assembly / disassembly forces, preventing swaying or jamming. This further ensures that the fuse remains precisely aligned with the stationary contact base during assembly / disassembly, avoiding fuse damage, base contact deformation, or abnormal wear of the internal mechanisms of the device due to lateral forces.

[0016] In some embodiments, the system further includes a power supply unit and a control unit. The power supply unit includes a lithium battery, and the control unit includes a selector switch for controlling the forward and reverse rotation of the drive motor in the electric drive system. The lithium battery provides a stable and portable power source, freeing the device from dependence on a fixed power source and making it suitable for various field environments such as substations.

[0017] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0018] 1. By setting up a clamping structure, a stable force point is provided for the entire device to be firmly connected to the stationary contact base in the narrow fuse box. A reliable lever fulcrum is constructed, which completely eliminates the problem of uneven force application and the need for manual intervention caused by the overall slippage and deviation of the device during electric propulsion. This directly overcomes the defect of traditional power tools that cannot work independently and reliably due to the lack of a stable force-bearing mechanism, and ensures the stability and universality of operation.

[0019] 2. The electric drive system replaces manual labor to provide precise and controllable axial pushing and pulling forces, which not only greatly reduces the physical burden on operators, but also avoids angular deviations and impact loads in manual operation through mechanical transmission, fundamentally solving the problem that the puller is easily damaged due to uneven force, and improving operational reliability and equipment life.

[0020] 3. The fuse grabbing and releasing system is linked with the electric drive system, enabling the operator to complete the entire process of grabbing, installing, removing and releasing the fuse through electrical control from behind the safety barrier of the insulated cover. This achieves a safe distance isolation between the operator and the live busbar and the fuse body, thereby completely eliminating the risk of electric arc injury faced by maintenance personnel due to close-range operation. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of the present invention and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort. In the drawings:

[0022] Figure 1 This is a structural diagram of the present invention;

[0023] Figure 2 This is a front view of the electric drive system in this invention;

[0024] Figure 3 This is a structural diagram of the electric drive system in this invention;

[0025] Figure 4 For the present invention Figure 2 Sectional view of AA;

[0026] Figure 5 This is a partial structural diagram of the present invention;

[0027] Figure 6 This is a partial structural diagram of the present invention;

[0028] Figure 7 This is an axial center sectional view of the press-insulating assembly in this invention;

[0029] Figure 8 This is a structural diagram of the clamping structure in this invention.

[0030] The attached diagram shows the markings and corresponding component names:

[0031] Insulating cover 10, insulating handle 11, release handle 300, spring 301, insulating sleeve 302, gripper handle 200, rotating shaft 201, first connecting rod 202, second connecting rod 203, first gripper 204, second gripper 205, lithium battery 15, positioning baffle 16, movable seat 500, insulating fixed seat 501, second safety fixing clip 502, first safety fixing clip 503, release hole 504, guide groove 505, connecting hole 506, lower gearbox housing 400, upper gearbox housing 401, transmission lead screw 402, drive motor 403, fixing screw 404, first driven gear 405, second driven gear 406, main gear 407, drive gear 408, through hole 409. Detailed Implementation

[0032] 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 embodiments and accompanying drawings. The illustrative embodiments and descriptions of this invention are only for explaining this invention and are not intended to limit this invention.

[0033] Throughout this specification, references to "an embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in connection with that embodiment or example is included in at least one embodiment of the invention. Therefore, the phrases "an embodiment," "an example," "an example," or "an example" appearing in various places throughout the specification do not necessarily refer to the same embodiment or example. Furthermore, specific features, structures, or characteristics can be combined in one or more embodiments or examples in any suitable combination and / or sub-combination. Moreover, those skilled in the art will understand that the illustrations provided herein are for illustrative purposes and are not necessarily drawn to scale. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0034] In the description of this invention, the terms "front", "rear", "left", "right", "up", "down", "vertical", "horizontal", "high", "low", "inner", and "outer" 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 element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this invention.

[0035] The terms "first," "second," etc., used in this invention are merely for clarity of description and are not intended to limit any order or emphasize importance. Furthermore, the term "connection" as used herein, unless otherwise specified, can refer to a direct connection or an indirect connection via other components.

[0036] Example

[0037] like Figures 1-8 As shown, this embodiment provides a quick installation and removal device for low-voltage side fuses of a station service transformer, including at least one clamping structure, an electric drive system, and a fuse gripping and releasing system. The clamping structure is connected to an insulating cover 10 and is used to clamp and position the entire device on a base near the stationary contact of the fuse. The electric drive system is disposed inside the insulating cover 10 and is used to provide axial pushing and pulling forces. The fuse gripping and releasing system is connected to the output end of the electric drive system and is used to grip and release the fuse.

[0038] See Figure 1 and Figure 8 The clamping structure includes an operating handle extending from the insulating cover 10, a first gripper 204 and a second gripper 205 disposed opposite to each other, and a linkage mechanism. The linkage mechanism includes a first link 202 and a second link 203. The apex of the triangle of the first link 202 is hinged to the insulating cover 10 through a pivot 201. The two bottom corners are respectively hinged to the lower inner side of the operating handle and the upper end of the second link 203. The lower end of the second link 203 is hinged to the upper outer side of the second gripper 205. The upper inner side of the second gripper 205 is hinged to the insulating cover 10. The lower end of the operating handle is hinged to the upper outer side of the first gripper 204. The upper inner side of the first gripper 204 is hinged to the insulating cover 10. When the operating handle is turned, the compound linkage mechanism precisely converts the swing motion of the handle into the opposing or opposite linear motion of the first gripper 204 and the second gripper 205. This allows the device to be firmly and adaptively clamped onto the stationary contact of the fuse and the lower base, forming a rigid and immovable lever fulcrum in a narrow space. This solves the slippage and offset problems caused by the lack of a stable force point in existing power tools, provides a stable and reliable foundation for subsequent electric assembly and disassembly, and enables the device to work independently without manual support.

[0039] Specifically, see Figure 8The insulating cover 10 has through holes on its sidewalls for the first gripper 204 and the second gripper 205 to extend from, and the grippers are in the shape of "]". The first connecting rod 202 is triangular in shape, and the hinge points are located at the triangular parts of the first connecting rod 202. The first gripper 204, the second gripper 205, the gripper handle 200 (operating handle), the first connecting rod 202, and the second connecting rod 203 are all provided with weight-reducing holes. The positioning block, the external fixed insulating seat, the release handle 300, the insulating sleeve 302, the first gripper 204, and the second gripper 205 are all made of nylon.

[0040] See Figure 1 and Figure 8 The clamping structure further includes a positioning baffle 16 disposed at the lower end of the insulating cover 10. The positioning baffle 16 has an operating groove for installing the fuse in the middle. The positioning baffle 16 is used to abut against the mounting structure for installing the fuse when the first gripper 204 and the second gripper 205 are clamped on the fuse base. By adding a positioning baffle 16 with an operating groove to the lower end of the insulating cover 10 on the basis of the clamping structure, when the first clamp 204 and the second clamp 205 are clamped on the fuse base, the positioning baffle 16 can simultaneously abut against the mounting structure (such as the box panel) on which the fuse is installed. This combines the clamping force with the abutment support force, further constraining the displacement freedom of the device in three-dimensional space, forming a more stable three-point positioning or surface contact support system. This enhances the torsional and overturning resistance of the entire device when subjected to large axial thrust or tension applied by the electric drive system, avoids uneven stress and damage to the fuse or base contacts caused by slight displacement of the device, and greatly improves the reliability and safety of operation.

[0041] join Figure 3 and Figure 4The electric drive system includes a drive motor 403 and a gearbox. The gearbox is assembled from a lower gearbox housing 400 and an upper gearbox housing 401 connected by fixing screws 404. The drive motor 403 is mounted on the gearbox, and its output shaft is connected to a mounting shaft via a coupling. A drive gear 408 is mounted on the mounting shaft. A transmission screw is fixedly connected to the top of the insulating cover 10. The threaded end of the transmission screw is screwed into the center of the main gear 407 inside the gearbox. The main gear 407 meshes with the drive gear 408. When the drive motor 403 rotates, the electric drive system moves up and down along the transmission screw. An electric transmission system consisting of a drive motor 403, a gear transmission box, and a transmission screw fixed to the top of the insulating cover 10 is adopted. The drive gear 408 meshes with the main gear 407, and the center of the main gear 407 is screwed to the threaded end of the transmission screw. This allows the rotational motion of the drive motor 403 to be reduced and amplified by the gear pair, and then converted into the precise linear motion of the gear transmission box (and its connected components) along the fixed transmission screw. This eliminates the need for a flexible transmission mechanism (such as a long shaft) between the drive motor 403 and the moving parts, greatly simplifying the layout within the narrow insulating cover 10. This achieves a highly compact and lightweight transmission system. At the same time, the self-locking and high precision of the screw drive itself make the speed and force of pushing and pulling controllable and stable, solving the problem of the puller being easily damaged due to uneven subjective force applied by the user, and ensuring the accuracy of the fuse installation and removal position.

[0042] See Figure 3 and Figure 4The electric drive system further includes a first driven gear 405 and a second driven gear 406. The first driven gear 405 and the second driven gear 406 are both mounted in the gear transmission box through corresponding mounting shafts and mesh with the main gear 407. The first driven gear 405 and the second driven gear 406 are located on the side of the main gear 407 away from the drive gear 408 and are symmetrical about the virtual connecting line between the centers of the main gear 407 and the drive gear 408. By adding a first driven gear 405 and a second driven gear 406 to the gear transmission system, arranged symmetrically with the line connecting the centers of the main gear 407 and the drive gear 408 as the axis of symmetry, and both meshing with the main gear 407, the torque of the drive motor 403 is transmitted to the main gear 407 through the drive gear 408 and then symmetrically distributed to the first and second driven gears 406. This symmetrical multi-gear splitting structure allows the radial forces acting on the main gear 407 and its centrally screwed transmission screw to be balanced and canceled out, improving the stress state of the main gear 407 and the transmission screw, avoiding the uneven load, wear, or even jamming that may occur with unilateral meshing, and improving the smoothness, reliability, and lifespan of the entire electric transmission system under long-term, heavy-load operation, ensuring the continuous stability and accuracy of the device's output force.

[0043] See Figures 1-7 The fuse gripping and releasing system includes an insulating fixing base 501, a pressing insulating component, and a movable base 500. The movable base 500 is connected to the inner side of the insulating fixing base 501. The insulating fixing base 501 can slide up and down along the inner side of the insulating cover 10. The insulating fixing base 501 is provided with several second safety fixing clips 502 that cooperate with fuse end caps of corresponding specifications. The movable base 500 is also provided with a first safety fixing clip 503. The insulating fixing base 501 is provided with a release hole 504 coaxial with the first safety fixing clip 503. The gear transmission box housing is provided with a through hole 409. The pressing insulating component passes through the through hole 409 and the release hole 504 in sequence and can be engaged or disengaged from the interface on the fuse end cap. The sliding cooperation between the insulating fixed seat 501 and the movable seat 500 ensures that the gripping mechanism can move synchronously and precisely with the electric drive system. The first and second safety fixing clips 502 reliably clamp the fuse end cap from both sides, ensuring that it will not come loose during the pushing or pulling process. In particular, the design of pressing the insulating component through the entire electric drive system to the fuse interface allows the operator to remotely control the locking and releasing of the fuse from outside the insulating cover 10, realizing physical isolation between the person and the fuse / busbar during the installation and disassembly process, fundamentally eliminating the risk of electric arc injury from close-range operation.

[0044] See Figures 1-7The press-insulating assembly includes a release handle 300, an insulating sleeve 302, and a spring 301. The spring 301 is sleeved on the release handle 300 to form a compression assembly. The compression assembly is slidably located inside the insulating sleeve 302. The pressing end of the release handle 300 extends out of the upper end of the insulating cover 10. The insulating sleeve 302 passes through the electric drive system and the release hole 504 in sequence. When the release handle 300 is pressed down, the distal end of the release handle 300 extends into the interface on the fuse end cap. When the release handle 300 is released, the distal end of the release handle 300 disengages from the interface, and the spring 301 provides a restoring force. The press-and-release insulating assembly is specifically defined as including a release handle 300, an insulating sleeve 302, and a spring 301. When the handle is pressed down, the force of the spring 301 is overcome so that the distal end of the handle extends and engages with the interface to achieve locking. When the handle 300 is released, the distal end of the handle automatically retracts under the restoring force of the spring 301, disengaging from the interface to achieve unlocking. The insulating sleeve 302 provides a complete insulation barrier for the entire moving assembly, making the fuse grabbing and releasing operation simple, quick, reliable, and completely under insulation protection.

[0045] Specifically, see Figure 7 The release handle 300 is an insulating rod with a stepped shaft structure. At its distal end, the release handle 300 has a radially protruding latch or tongue, which corresponds to an L-shaped slot or jaw on the interface of the fuse cap. In the initial (unpressed) state, under the restoring force of the spring 301, the latch at the distal end of the release handle 300 is located outside the horizontal entrance section of the L-shaped slot. The operator presses the release handle 300 downwards from the top of the insulating cover 10, compressing the spring 301 and driving the entire insulating rod to slide downwards along the insulating sleeve 302. Its distal end moves downwards accordingly, and the radial latch first enters the horizontal entrance section of the L-shaped slot and continues downwards. When the latch reaches the top of the vertical section of the L-shaped slot, the operator can slightly rotate the release handle 300 (or allow for a slight deflection through structural guidance), causing the latch to slide from the horizontal entrance section into the vertical section. Due to the continuous downward pressure of the spring 301 and the possible slight bevel or chamfer design, the locking block will naturally engage with the bottom of the vertical section, forming a mechanical interlock. At this time, the release handle 300 is locked in the pressed position, and its distal end, through the cooperation of the locking block and the L-shaped slot, firmly hooks or locks into the interface of the fuse end cap, thereby connecting the fuse and the gripping mechanism (through the first and second safety fixing clips 502) into one unit, achieving reliable gripping and locking, and allowing for subsequent push-in or pull-out operations.

[0046] See Figures 1-7The movable seat 500 is also provided with a connecting hole 506. Pin holes are provided on the side wall of the connecting hole 506 and at the lower end of the transmission screw 402. The lower end of the transmission screw is connected to the movable seat 500 via pins. This creates a detachable, rigid, and reliable connection between the movable seat 500 and the output end of the transmission screw, capable of withstanding a certain bending moment. This not only ensures that the linear thrust of the electric drive system can be effectively and without loss transmitted to the movable seat 500 and the fuse gripping mechanism, but also that its simple pin structure facilitates the installation, maintenance, and replacement of gripping components of different specifications, enhancing the practicality and adaptability of the device.

[0047] See Figure 1 and Figure 6 The movable seat 500 has at least two guide grooves 505 on its outer periphery, and the insulating cover 10 has several protruding ridges that cooperate with the guide grooves 505 on its inner side. Because at least two guide grooves 505 are provided on the outer periphery of the movable seat 500, and form a sliding fit with the corresponding protruding ridges on the inner side of the insulating cover 10, it is ensured that the movement trajectory of the movable seat 500 remains strictly straight when subjected to axial installation and removal forces, without any swaying or jamming. This further ensures that the fuse remains precisely aligned with the stationary contact base during installation and removal, avoiding fuse damage, base contact deformation, or abnormal wear of the internal mechanism of the device due to lateral forces.

[0048] See Figure 1 It also includes a power supply unit and a control unit. The power supply unit includes a lithium battery 15, and the control unit includes a selector switch for controlling the forward and reverse rotation of the drive motor 403 in the electric drive system. The lithium battery 15 provides a stable and portable power source, freeing the device from dependence on a fixed power source and making it suitable for various field environments such as substations. An insulated handle 11 is also provided on the insulated cover 10.

[0049] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. 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 quick-release device for low-voltage side fuses of a station service transformer, characterized in that, include: At least one clamping structure, connected to an insulating cover, is used to clamp and position the entire device on a base near the stationary contact of the fuse. An electric drive system, housed within the insulated housing, is used to provide axial propulsion and pull-out forces; A fuse grabbing and releasing system is connected to the output end of the electric drive system for grabbing and releasing fuses.

2. The quick-release device for low-voltage side fuses of station service transformers according to claim 1, characterized in that, The clamping structure includes an operating handle extending from the insulating cover, a first gripper and a second gripper arranged opposite each other, and a linkage mechanism. The linkage mechanism includes a first link and a second link. The apex of the triangle of the first link is hinged to the insulating cover via a pivot, and the two bottom corners are respectively hinged to the lower inner side of the operating handle and the upper end of the second link. The lower end of the second link is hinged to the upper outer side of the second gripper, and the upper inner side of the second gripper is hinged to the insulating cover. The lower end of the operating handle is hinged to the upper outer side of the first gripper, and the upper inner side of the first gripper is hinged to the insulating cover.

3. The quick-release device for low-voltage side fuses of station service transformers according to claim 2, characterized in that, The clamping structure also includes a positioning baffle disposed at the lower end of the insulating cover. The positioning baffle has an operating groove for installing a fuse in the middle. The positioning baffle is used to abut against the mounting structure for installing the fuse when the first and second jaws are clamped on the fuse base.

4. The quick-release device for low-voltage side fuses of station service transformers according to claim 1, characterized in that, The electric drive system includes a drive motor and a gearbox. The gearbox is assembled from a lower gearbox housing and an upper gearbox housing. The drive motor is mounted on the gearbox, and the output shaft is connected to the mounting shaft via a coupling. A drive gear is mounted on the mounting shaft. A transmission screw is fixedly connected to the top of the insulating cover. The threaded end of the transmission screw is screwed into the center of the main gear inside the gearbox. The main gear meshes with the drive gear. When the drive motor rotates, the electric drive system moves up and down along the transmission screw.

5. The quick-release device for low-voltage side fuses of station service transformers according to claim 4, characterized in that, The electric drive system further includes a first driven gear and a second driven gear. The first driven gear and the second driven gear are both mounted in the gear transmission box through corresponding mounting shafts and mesh with the main gear. The first driven gear and the second driven gear are located on the side of the main gear away from the drive gear and are symmetrical about the virtual line connecting the centers of the main gear and the drive gear.

6. The quick-release device for low-voltage side fuses of station service transformers according to claim 4, characterized in that, The fuse gripping and releasing system includes an insulating base, a pressing insulating component, and a movable base. The movable base is connected to the inner side of the insulating base, and the insulating base can slide up and down along the inner side of the insulating cover. The insulating base is provided with several second safety retaining clips that cooperate with fuse end caps of corresponding specifications. The movable base is also provided with a first safety retaining clip. The insulating base is provided with a release hole coaxial with the first safety retaining clip. The gear transmission box housing is provided with a through hole. The pressing insulating component passes through the through hole and the release hole in sequence and can engage or disengage with the interface on the fuse end cap.

7. The quick-release device for low-voltage side fuses of station service transformers according to claim 6, characterized in that, The press-and-insulate assembly includes a release handle, an insulating sleeve, and a spring. The spring is sleeved on the release handle to form a compression assembly, which is slidably located inside the insulating sleeve. The pressing end of the release handle extends out of the upper end of the insulating cover. The insulating sleeve passes through the electric drive system and the release hole in sequence. When the release handle is pressed down, the distal end of the release handle extends into the interface on the fuse end cap. When the release handle is released, the pin is inserted into the distal end of the release handle and abuts against the interface on the fuse end cap.

8. The quick-release device for low-voltage side fuses of station service transformers according to claim 6, characterized in that, The movable seat is also provided with a connecting hole, and a pin hole is provided on the side wall of the connecting hole and the lower end of the transmission screw. The lower end of the transmission screw is connected to the movable seat by the pin.

9. The quick-release device for low-voltage side fuses of station service transformers according to claim 6, characterized in that, The outer periphery of the movable seat is provided with at least two guide grooves, and the inner side of the insulating cover is provided with several protruding ridges that cooperate with the guide grooves.

10. The quick-release device for low-voltage side fuses of station service transformers according to any one of claims 1-9, characterized in that, It also includes a power supply unit and a control unit. The power supply unit includes a lithium battery, and the control unit includes a switch for controlling the forward and reverse rotation of the drive motor in the electric drive system.

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