A user-friendly low-voltage switchgear with a safety protection interlock device

Abstract

The present invention discloses a user-friendly low-voltage switchgear cabinet with a safety protection interlocking device. It includes a static connection component module, a hinge interlocking protection mechanism, an anti-misoperation interlocking bottom plate, a modular circuit breaker, a dynamic connection component module, a closing interlocking mechanism, and an electromagnetic protection interlocking mechanism arranged on the installation bottom plate of the cabinet body. The static connection component module is fixedly arranged on the installation bottom plate, the hinge interlocking protection mechanism is installed on the assembly end face of the installation bottom plate, the modular circuit breaker is installed on the anti-misoperation interlocking bottom plate, the anti-misoperation interlocking bottom plate is combined with the anti-misoperation positioning screws on the installation bottom plate, and the anti-misoperation interlocking bottom plate and the hinge interlocking protection mechanism are interlocked and combined with each other. The beneficial effects of the present invention include: the low-voltage switchgear cabinet provided by the present invention adopts a protection mechanism composed of a general-purpose low-voltage complete circuit breaker switch module device and a safety interlocking protection structure of an adjustable adaptation module device, ensuring the safety of operators and realizing a user-friendly operation experience for maintenance personnel.

Description

Technical Field

[0001] The present invention belongs to the technical field of safety control structures for distribution equipment, and more specifically, particularly relates to a user-friendly low-voltage switchgear with a safety protection interlock device. Background Art

[0002] In modern power supply systems, low-voltage switchgear, as a key device for power distribution and control, is widely used in various industrial, commercial, and civilian places. The plug-in circuit breaker, as one of the core components of low-voltage switchgear, plays a crucial role in aspects such as on-off control of circuits, overload protection, and short-circuit protection. However, during the operation and maintenance process of repairing or replacing the plug-in circuit breaker of a fixed low-voltage cabinet, there are many operation risks, seriously threatening the personal safety of operation and maintenance personnel and the stable operation of the power system.

[0003] (I) Problem of hot plugging under the closing state

[0004] Currently, many plug-in circuit breakers of fixed low-voltage cabinets are not equipped with effective interlock devices. This allows maintenance personnel to potentially remove the switch body from the switch base without knowing it when the switch is in the closing state. In some places lacking standardized operation procedures and effective equipment protection, the situation of plugging and unplugging without realizing that the switch is in the closing state often occurs. Such hot plugging operations are extremely likely to cause arcing phenomena. The high temperature and strong light generated by the arc can not only instantly burn maintenance personnel but also may lead to serious accidents such as electrical fires and explosions, resulting in huge losses.

[0005] (II) Problem of exposed live conductors on the base

[0006] When the switch body is pulled out from the base, the live conductors on the base will be partially exposed. In the narrow internal space of the low-voltage cabinet, when maintenance personnel are performing switch replacement operations, due to reasons such as blocked vision, limited operation space, and distracted attention, it is very easy to accidentally touch these exposed live conductors, and accidentally touching the exposed live conductors on the base may lead to electric shock accidents and cause casualties.

[0007] (III) Problem of bursting and removal of the insulating material of the switch body

[0008] During the installation and disassembly of the plug-in circuit breaker, if the operator constructs improperly, such as using too much torque to tighten the screws at the connection part between the switch body and the base, or applying too much force or incorrect direction during the plugging and unplugging process, it may cause the insulating material on the switch body to burst. The bursting of the insulating material will not only reduce the insulation performance of the switch but also may cause internal live components to be exposed, increasing the risk of electric shock. Damaging the switch also makes subsequent repair work more complex and dangerous.

[0009] When the insulating connection part of the switch body bursts and is damaged, since there is no emergency unlocking device, the screws of the switch moving component are still connected to the base. At this time, if the switch body needs to be removed, it is often necessary to violently remove the entire switch base. This removal method is not only difficult to construct, consuming a large amount of time and manpower, but also during the removal process, since the switch base is energized, the operation and maintenance personnel are extremely likely to get an electric shock, bringing serious obstacles to the maintenance work.

[0010] (4) Anti-misoperation installation problems during the installation process

[0011] When installing the circuit breaker body and the moving component, existing plug-in circuit breakers often lack obvious anti-misoperation designs. This makes the operation and maintenance personnel operate based on experience or memory during the installation process, and it is easy to make installation errors. For example, installing the circuit breaker body in the reverse direction, incorrect connection of the moving component, etc. These incorrect installations may cause the circuit breaker to not work properly, and even cause failures when power is supplied, affecting normal power supply. Incorrect installations not only affect the normal operation of a single circuit breaker, but also may pose a threat to the stability and reliability of the entire power system.

[0012] (5) Problem of poor contact of the conductor lap joint

[0013] As a multi-transfer adjustable adapter device, the good or bad contact of the conductor lap joint of the plug-in circuit breaker directly affects the quality of power transmission. If the conductor lap joint has poor contact, it will cause too high loop resistance. According to Joule's law, an increase in resistance will cause the conductor to generate more heat when passing through current, resulting in too high a temperature rise. When the temperature rise does not meet the national standard, it will not only accelerate the aging and damage of the conductor, but also may cause safety accidents such as fires, bringing huge economic losses to the enterprise.

[0014] In summary, these operation risks existing in the plug-in circuit breaker of the existing fixed low-voltage switchgear during the repair or replacement process seriously affect the safe and stable operation of the power system and the personal safety of operation and maintenance personnel. Therefore, it is extremely urgent to develop a switchgear circuit breaker with a safety plugging and unplugging mechanism with an interlocking mechanism. Summary of the Invention

[0015] The purpose of the present invention is to solve the problems existing in the above-mentioned prior art in practical applications, and provide a user-friendly low-voltage switchgear with a new design of a safety protection interlocking device that is convenient to install, firmly combined, and safe to use.

[0016] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0017] A user-friendly low-voltage switchgear cabinet with a safety protection interlock device is provided with a static connection component module, a hinge interlock protection mechanism, an anti-misoperation interlock base plate, a modular circuit breaker, a dynamic connection component module, a closing interlock mechanism, and an electromagnetic protection interlock mechanism on the installation base plate of the cabinet body. The hinge interlock protection mechanism is used to block the exposed copper row part of the static connection component module through interlock actions when the dynamic connection component module is not installed or removed, avoiding accidental accidents caused by mis-touching during operation. The anti-misoperation interlock base plate is used to install the modular circuit breaker and combine with the hinge interlock protection mechanism for interlock actions. The dynamic connection component module is used to connect the modular circuit breaker with the static connection component module after the modular circuit breaker is installed. The closing interlock mechanism is used to combine with the modular circuit breaker to achieve manual closing locking interlock. The electromagnetic protection interlock mechanism is used to combine with the modular circuit breaker to achieve electric control closing locking interlock protection.

[0018] Among them, the static connection component module is fixedly arranged on the installation base plate, the hinge interlock protection mechanism is installed on the assembly end face of the installation base plate, the modular circuit breaker is installed on the anti-misoperation interlock base plate, the anti-misoperation interlock base plate is combined with the anti-misoperation positioning screws on the installation base plate, the anti-misoperation interlock base plate is interlocked and combined with the hinge interlock protection mechanism, the dynamic connection component module is connected and combined with the static connection component module and the modular circuit breaker, the closing interlock mechanism is combined and interlocked with the modular circuit breaker and installed on the anti-misoperation interlock base plate, the electromagnetic protection interlock mechanism is connected with the modular circuit breaker, and the electromagnetic protection interlock mechanism is installed on the fixing plate of the installation base plate.

[0019] Preferably, the hinge interlock protection mechanism includes a cover plate installed on the mounting base plate. A rotating link is provided on the rotating stud of the cover plate. The interlock stud of the rotating link is slidably arranged in the interlock guiding hole of the cover plate. The interlock guiding hole is inclined. The two ends of the rotating link are rotatably connected with transmission links. One end of the transmission link is rotatably connected with a protection connection link. An insulating guard plate is installed at the protruding end of the protection connection link. The rotating link rotates around the rotating stud under the sliding fit of the interlock stud and the interlock guiding hole, and drives the insulating guard plate to complete the contraction and extension interlock actions through the transmission link and the protection connection link. An interlock guiding plate is installed on the interlock side of the anti-misoperation interlock base plate. A guard plate interlock clamping hole is formed on the interlock guiding plate. The guard plate interlock clamping hole and the interlock stud are in sliding guiding fit. Installation plates are provided on both sides of the anti-misoperation interlock base plate. An anti-misoperation one-way clamping hole and an interlock sliding hole are formed on the installation plate. The anti-misoperation one-way clamping hole and the anti-misoperation positioning screw form an insertion clamping combination. A sliding guiding hole is provided at the position corresponding to the interlock sliding hole on the side of the anti-misoperation interlock base plate. The anti-misoperation interlock base plate forms an action interlock with the hinge interlock protection mechanism through the interlock guiding plate. The guard plate interlock clamping hole of the interlock guiding plate drives the interlock stud to act to control the interlock protection action of the hinge interlock protection mechanism. The sliding guiding hole is combined with the closing interlock mechanism.

[0020] Preferably, when the insulating guard plate contracts, it is arranged inside the moving component connection hole of the static connection component module, so that the moving combination bolt of the moving connection component module can be inserted and connected into the static connection component module. After the insulating guard plate extends, it shields and is arranged in front of the moving component connection hole of the static connection component module. The insulating guard plate completely covers and blocks in front of the moving component connection hole of the static connection component module, which can effectively prevent the operator from accidentally touching the exposed copper bar of the static connection component module and improve the safety of operation protection.

[0021] The weight of the insulating guard plate located below is greater than the weight of the insulating guard plate located above. Using the gravity effect, the heavier insulating guard plate below pulls down to enable the hinge interlock protection mechanism to automatically extend the insulating guard plate to both ends to shield the moving component connection hole of the static connection component module without interlock control, playing a protective role and further improving the safety protection of operation.

[0022] Preferably, a connecting tenon is provided at the combined end of the interlock guiding plate. The interlock guiding plate is fixedly combined with the mortise hole of the anti-misoperation interlock base plate through the connecting tenon on the interlock combined side of the anti-misoperation interlock base plate.

[0023] Preferably, the closing interlock mechanism comprises an interlocking paddle arranged outside the modular circuit breaker, an interlocking jack is provided in the middle of the interlocking paddle, the opening and closing paddle of the modular circuit breaker is inserted into the interlocking jack, and the opening and closing paddle can be linked with the interlocking paddle to realize the opening and closing protection interlocking when performing the opening and closing action. Sliding guide studs are installed on both sides of the interlocking paddle, and the sliding guide studs and the sliding guide holes are a sliding guide combination, and the sliding guide holes guide and limit the sliding stroke of the interlocking paddle, and the interlocking end of the interlocking paddle is installed with a stud screw, and the stud screw passes through the interlocking guide hole and is slidably installed in the limiting gourd hole on the mounting base plate, and the limiting gourd hole is a structure with a wide insertion part at the lower end and a narrow sliding part at the upper end, and the sliding part of the limiting gourd hole is in sliding fit with the screw of the stud screw. When in the opening state, the stud screw of the interlocking paddle is inserted from the insertion part at the lower end of the limit gourd hole to the rear end of the mounting base plate. When the closing action is performed, the opening and closing paddle drives the interlocking paddle to move upward along the interlocking guide hole, and the screw rod of the stud screw is inserted into the sliding part of the limit gourd hole and slides upward synchronously. The bolt head at the rear end of the stud screw is stuck on the outside of the sliding part, so that the interlocking paddle limits the installation position of the modular circuit breaker to prevent the modular circuit breaker from being removed in the closing state.

[0024] Preferably, the hole diameter of the insertion portion at the lower end of the limiting gourd hole is larger than the diameter of the screw end of the stud screw, the width of the sliding portion at the upper end of the limiting gourd hole is smaller than the diameter of the screw end of the stud screw, and the interlocking paddle is a "凵" type structure, which can be fitted and wrapped on the outside of the modular circuit breaker to save space.

[0025] Preferably, the electromagnetic protection interlocking mechanism includes a baffle, an electromagnetic lock and an electric control mechanism. The baffle is used to shield the operating part of the moving connection component module, so as to achieve the protection effect that the modular circuit breaker body cannot be disassembled in the closed state. The electric control mechanism is used to realize the opening and closing actions of the electrically controlled switch modular circuit breaker. The electromagnetic lock, the baffle and the electric control mechanism realize the electric control interlocking protection. A hanging plate hole is opened at the front end of the fixed plate, and a buckle is provided on the inner side of the baffle of the electromagnetic protection interlocking mechanism. The buckle is hung and installed in the hanging plate hole. An interlocking pressure plate is provided at the lower inner end of the baffle. The electromagnetic lock of the electromagnetic protection interlocking mechanism is installed at the upper end of the fixed plate below. The electromagnetic lock is connected to the modular circuit breaker, and the lock tongue of the electromagnetic lock is pressed against the upper end of the interlocking pressure plate. The electric control mechanism is installed on the operating end face of the modular circuit breaker. The baffle is hung on the fixed plate, the lock tongue of the electromagnetic lock is placed on the interlocking pressure plate, the electric control mechanism controls the modular circuit breaker to close and simultaneously energizes the connected electromagnetic lock, the lock tongue is pressed on the interlocking pressure plate, so that the baffle is firmly mounted on the fixed plate, and the baffle cannot be removed in the closed state.

[0026] Preferably, the bolt head of the movable combination bolt of the movable connection component module is a four-corner bolt head, and the outer surface of the four-corner bolt head is coated with insulating paint. The connecting end of the insulating connection head combined with the movable combination bolt is provided with a four-corner combination groove. The insulating connection head is combined and installed on the movable combination bolt through the four-corner combination groove and drives the movable combination bolt to rotate. The operating end of the insulating connection head is provided with an outer four-corner operating end, and the outer four-corner operating end extends outside the operating end of the movable connection component module. An inner hexagonal unlocking hole is provided in the four-corner bolt head of the movable combination bolt and the insulating connection head. The combined ends of the four-corner bolt head and the insulating connection head are both provided with a horizontally penetrating combination positioning hole. The combination positioning hole can help the installer accurately install the insulating connection head on the movable combination bolt, align the inner hexagonal unlocking hole of the four-corner bolt head with the insulating connection head. Further, a combination pin can be installed in the combination positioning hole to combine the insulating connection head and the movable combination bolt more firmly together, improving the transmission stability of the rotational operation.

[0027] Preferably, the static connection component module, the hinge interlock protection mechanism, the anti-misoperation interlock bottom plate, the modular circuit breaker, the movable connection component module and the closing interlock mechanism form a manual interlock protection structure, and the static connection component module, the hinge interlock protection mechanism, the anti-misoperation interlock bottom plate, the modular circuit breaker, the movable connection component module and the electromagnetic protection interlock mechanism form an electric control interlock protection structure.

[0028] Preferably, the coupler quick-connect panel provided on the mounting base plate is an inclined-angle access structure, and the insertion end of the coupler quick-connect panel is inclined downward, which can effectively reduce the installation stress caused when the cable is combined with the insertion end, improving the connection safety and the protection effect on the insertion end. There is a flip-type protective cover above the extended cable ear provided on the mounting base plate, which can effectively protect the cable ear. When connection is needed, it only needs to be flipped open. After the flip-type protective cover is flipped up, the cable ear can be locked to the copper bar lap joint hole with bolts. When connection is not needed, covering the flip-type protective cover can avoid accidental touch and accidents, and it can have both operation convenience and protection safety at the same time.

[0029] Compared with the prior art, the beneficial effects of the present invention include:

[0030] The low-voltage switchgear provided by the present invention adopts a protection mechanism composed of a safety interlock protection structure of a general-purpose low-voltage complete circuit breaker switch module device and an adjustable adaptation module device. Based on the general-purpose low-voltage complete circuit breaker switch module, a supporting safety protection interlock device is set to ensure the safety of operators and achieve a user-friendly operation experience for maintenance personnel.

[0031] The safety interlock protection structure provided by the present invention includes two interlock structures, a manual interlock protection structure and an electric control interlock protection structure. It can adapt to different installation and control requirements. The combined application of multiple interlock structures effectively prevents live plugging and unplugging operations in the closed state, greatly reduces the risks of arcing and electric shock, and protects the lives of operation and maintenance personnel.

[0032] The present invention installs a hinge interlocking protection mechanism on the installation base plate. The hinge protection interlocking structure composed of the hinge interlocking protection mechanism and the anti-misoperation interlocking base plate can prevent operators from accidentally touching the exposed copper busbar during operation, thereby realizing insulation interlocking protection during installation and maintenance, and providing effective safety protection for operators.

[0033] The present invention provides an anti-misoperation structure on the anti-misoperation interlocking base plate, and the design ensures the correct installation of the modular circuit breaker body and the dynamic connection component module, avoids the failure of the interlocking mechanism caused by installation errors, and ensures the normal operation of the power system.

[0034] The present invention improves the protruding end of the insulating connector of the dynamic connection component module into an outer four-corner operating end structure, which can withstand a higher operating torque, avoid damage or bursting of the insulating connector due to excessive torque during operation, ensure smooth maintenance and the safety of operators, reduce equipment damage caused by operating errors, extend the service life of the equipment, and reduce the overall cost. At the same time, the structural design of the hexagonal unlocking hole is provided inside the four-corner bolt head of the dynamic combination bolt of the dynamic connection component module and the insulating connector, so that when dealing with faults such as bursting of the insulating material of the switch body, there is no need to violently dismantle the entire switch base, saving maintenance time and labor costs.

[0035] The present invention has an inclined angle access structure for the coupler quick-connect panel on the mounting base plate, which can effectively reduce the installation stress caused by the cable connection and the insertion end when they are connected and combined, thereby improving the connection safety and the protection effect on the insertion end. The present invention also has a flip-up protective cover above the protruding cable ear arranged on the mounting base plate, which can effectively protect the cable ear. When connection is needed, it only needs to be flipped up. After the flip-up protective cover is flipped up, the cable ear can be locked on the copper busbar overlapping hole with bolts. When no connection is needed, covering the flip-up protective cover can prevent people from accidentally touching the live conductor in the cabinet, and can have both convenient operation and protective safety.

[0036] Through the combined action of the safety design measures of the multi-layer interlocking structure, the present invention provides comprehensive safety protection for operation and maintenance personnel during installation and repair, significantly reducing the safety risks in operation and maintenance operations. The interlocking protection design of the friendly low-voltage switchgear provided by the present invention is reasonable, has a compact structure, is convenient to install, and can be applied to various fixed low-voltage cabinets. Whether it is a new project or the transformation of an old low-voltage cabinet, it can be conveniently installed and used. Moreover, the various safety designs and function optimizations of the present invention do not affect the normal performance and operation of the internal devices of the switchgear, have good compatibility with the existing power system, and have broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 is a schematic structural diagram of the present invention.

[0038] Figure 2 is an exploded structural schematic diagram of the manual interlocking protection structure of the present invention.

[0039] Figure 3 is a schematic structural diagram of the electromagnetic protection interlocking mechanism of the present invention.

[0040] Figure 4 is a schematic structural diagram of the baffle of the present invention.

[0041] Figure 5 is a schematic structural diagram of the electromagnetic lock of the present invention.

[0042] Figure 6 is a combined interlocking schematic diagram of the electromagnetic protection interlocking mechanism of the present invention.

[0043] Figure 7 is a schematic structural diagram of the hinge interlocking protection mechanism of the present invention.

[0044] Figure 8 is a schematic structural diagram of the interlocking transmission side of the hinge interlocking protection mechanism of the present invention.

[0045] Figure 9 is a schematic structural diagram of the anti-misoperation interlocking bottom plate of the present invention.

[0046] Figure 10 is a schematic structural diagram of the interlocking side of the anti-misoperation interlocking bottom plate of the present invention.

[0047] Figure 11 is a combined interlocking schematic diagram of the anti-misoperation interlocking bottom plate and the hinge interlocking protection mechanism of the present invention.

[0048] Figure 12 is a schematic internal structural diagram of the moving connection component module of the present invention.

[0049] Figure 13 is a schematic diagram of the insulating connector structure of the present invention.

[0050] Figure 14 It is a schematic diagram of pre-installing a modular circuit breaker inside the cabinet of the present invention.

[0051] Explanation of the reference numerals in the attached drawings:

[0052] Static connection component module - 1, hinge interlock protection mechanism - 2, anti-misoperation interlock bottom plate - 3, modular circuit breaker - 4, moving connection component module - 5, closing interlock mechanism - 6, electromagnetic protection interlock mechanism - 7, installation bottom plate - 8, cover plate - 21, rotating stud - 22, rotating connecting rod - 23, interlock stud - 24, interlock guiding hole - 25, transmission connecting rod - 26, protection connecting rod - 27, insulating protection plate - 28, anti-misoperation one-way card hole - 31, interlock sliding hole - 32, sliding guiding hole - 33, interlock guiding plate - 34, protection plate interlock card hole - 35, connecting tenon - 36, mortise and tenon hole - 37, closing and opening toggle - 41, electric control mechanism - 42, moving combination bolt - 51, four - corner bolt head - 52, insulating connection head - 53, four - corner combination groove - 54, outer four - corner operation end - 55, internal hexagonal unlocking hole - 56, combination positioning hole - 57, interlock toggle - 61, interlock jack - 62, sliding guiding stud - 63, double - headed screw - 64, baffle - 71, buckle - 72, interlock pressure plate - 73, electromagnetic lock - 74, lock tongue - 75, anti - misoperation positioning screw - 81, limiting gourd hole - 82, fixing plate - 83, hanging plate hole - 84, flip - type protective cover - 85. Detailed implementation manners

[0053] The present invention will be further described below in conjunction with the detailed implementation manners. Among them, the attached drawings are only for illustrative purposes, showing only schematic diagrams, not physical diagrams, and should not be construed as a limitation to this patent; in order to better illustrate the embodiments of the present invention, some components in the attached drawings will be omitted, enlarged or reduced, which do not represent the actual size of the product; for those skilled in the art, it is understandable that some well - known structures and their descriptions in the attached drawings may be omitted.

[0054] In the attached drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", etc. indicating the orientation or position relationship, they are based on the orientation or position relationship shown in the attached drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the position relationship in the attached drawings are only for illustrative purposes and should not be construed as a limitation to this patent. For those of ordinary skill in the art, the specific meanings of the above - mentioned terms can be understood according to specific circumstances.

[0055] The present invention will be further described below in conjunction with specific embodiments and the attached drawings:

[0056] As Figures 1 to 14 shown is the structural schematic diagram provided by the present invention. Specifically, the present invention is a user-friendly low-voltage switchgear cabinet with a safety protection interlock device. A static connection component module 1, a hinge interlock protection mechanism 2, an anti-misoperation interlock bottom plate 3, a modular circuit breaker 4, a dynamic connection component module 5, a closing interlock mechanism 6, and an electromagnetic protection interlock mechanism 7 are provided on the installation bottom plate 8 of the cabinet body. The hinge interlock protection mechanism 2 is used to block the exposed copper bar part of the static connection component module 1 through an interlock action when the dynamic connection component module 5 is not installed or removed, so as to avoid accidental accidents caused by accidental touch during operation.

[0057] Among them, the anti-misoperation interlock bottom plate 3 is used to install the modular circuit breaker 4 and combine with the hinge interlock protection mechanism 2 for interlock action. The dynamic connection component module 5 is used to connect the modular circuit breaker 4 with the static connection component module 1 after the modular circuit breaker 4 is installed. The closing interlock mechanism 6 is used to combine with the modular circuit breaker 4 to achieve manual closing locking interlock. The electromagnetic protection interlock mechanism 7 is used to combine with the modular circuit breaker 4 to achieve electrically controlled closing locking interlock protection.

[0058] Among them, the static connection component module 1 is fixedly arranged on the installation bottom plate 8. The hinge interlock protection mechanism 2 is installed on the assembly end face of the installation bottom plate 8. The modular circuit breaker 4 is installed on the anti-misoperation interlock bottom plate 3. The anti-misoperation interlock bottom plate 3 is combined with the anti-misoperation positioning screw 81 on the installation bottom plate 8. The anti-misoperation interlock bottom plate 3 and the hinge interlock protection mechanism 2 are interlocked and combined with each other. The dynamic connection component module 5 is connected and combined with the static connection component module 1 and the modular circuit breaker 4. The closing interlock mechanism 6 is combined with the modular circuit breaker 4 and interlockingly installed on the anti-misoperation interlock bottom plate 3. The electromagnetic protection interlock mechanism 7 is connected with the modular circuit breaker 4, and the electromagnetic protection interlock mechanism 7 is installed on the fixing plate 83 of the installation bottom plate 8.

[0059] Preferably, the hinge interlock protection mechanism 2 includes a cover plate 21, the cover plate 21 is installed on the installation base plate 8, a rotating connecting rod 23 on the rotating stud 22 of the cover plate 21, the interlocking stud 24 of the rotating connecting rod 23 is slidably arranged in the interlocking guide hole 25 of the cover plate 21, the interlocking guide hole 25 is inclined, both ends of the rotating connecting rod 23 are rotatably connected with a transmission connecting rod 26, one end of the transmission connecting rod 26 is rotatably connected with a protection connecting rod 27, an insulating guard plate 28 is installed at the protruding end of the protection connecting rod 27, and the rotating connecting rod 23 rotates around the rotating stud 22 under the sliding fit of the interlocking stud 24 and the interlocking guide hole 25, and drives the insulating guard plate 28 to complete the contraction and extension interlock actions through the transmission connecting rod 26 and the protection connecting rod 27. An interlocking guide plate 34 is installed on the interlocking side of the anti-misoperation interlock base plate 3, a guard plate interlocking card hole 35 is opened on the interlocking guide plate 34, the guard plate interlocking card hole 35 and the interlocking stud 24 are in sliding guide fit, installation plates are arranged on both sides of the anti-misoperation interlock base plate 3, an anti-misoperation one-way card hole 31 and an interlocking sliding hole 32 are opened on the installation plates, the anti-misoperation one-way card hole 31 and the anti-misoperation positioning screw 81 are in an insertion and clamping combination, and a sliding guide hole 33 is arranged at the position corresponding to the interlocking sliding hole 32 on the side of the anti-misoperation interlock base plate 3. The anti-misoperation interlock base plate 3 forms an action interlock with the hinge interlock protection mechanism 2 through the interlocking guide plate 34, and the guard plate interlocking card hole 35 of the interlocking guide plate 34 drives the interlocking stud 24 to act to realize the control of the interlock protection action of the hinge interlock protection mechanism 2. The sliding guide hole 33 is combined with the closing interlock mechanism 6.

[0060] Preferably, when the insulating guard plate 28 contracts, it is arranged inside the moving component connection hole of the static connection component module 1, so that the moving combination bolt 51 of the moving connection component module 5 can be inserted and connected into the static connection component module 1. After the insulating guard plate 28 extends, it shields and is arranged in front of the moving component connection hole of the static connection component module 1. The insulating guard plate 28 completely covers and blocks in front of the moving component connection hole of the static connection component module 1, which can effectively prevent the operator from accidentally touching the exposed copper bar of the static connection component module 1 and improve the safety of operation protection.

[0061] The weight of the lower insulating guard plate 28 is greater than the weight of the upper insulating guard plate 28. By using the gravity action, the heavier insulating guard plate 28 below pulls down, so that the hinge interlock protection mechanism 2 can realize the automatic extension of the insulating guard plate 28 to both ends to shield the moving component connection hole of the static connection component module 1 without interlock control, playing a protective role and further improving the safety protection of operation.

[0062] Preferably, a connecting tenon 36 is provided at the combined end of the interlocking guide plate 34. The interlocking guide plate 34 is fixedly combined with the mortise and tenon hole 37 of the anti-misoperation interlocking bottom plate 3 through the connecting tenon 36 on the interlocking combined side of the anti-misoperation interlocking bottom plate 3.

[0063] Preferably, the closing interlocking mechanism 6 includes an interlocking dial 61 arranged outside the modular circuit breaker 4. An interlocking jack 62 is opened in the middle of the interlocking dial 61. The closing and opening dial 41 of the modular circuit breaker 4 is sleeved into the interlocking jack 62. When the closing and opening dial 41 performs the closing and opening actions, it can drive the interlocking dial 61 to realize the closing and opening protection interlock.

[0064] Sliding guide studs 63 are installed on both sides of the interlocking dial 61. The sliding guide studs 63 and the sliding guide holes 33 are in a sliding guide combination. The sliding guide holes 33 guide and limit the sliding stroke of the interlocking dial 61. A double-headed screw 64 is installed at the interlocking end of the interlocking dial 61. The double-headed screw 64 passes through the interlocking guide hole 25 and is slidably installed in the limit calabash hole 82 on the mounting bottom plate 8. The limit calabash hole 82 has a structure with a wider insertion part at the lower end and a narrower sliding part at the upper end. The sliding part of the limit calabash hole 82 and the screw rod of the double-headed screw 64 are in sliding fit. When in the open state, the double-headed screw 64 of the interlocking dial 61 is inserted into the rear end of the mounting bottom plate 8 from the insertion part at the lower end of the limit calabash hole 82. Then, when performing the closing action, the closing and opening dial 41 drives the interlocking dial 61 to move upward along the interlocking guide hole 25. The screw rod of the double-headed screw 64 is inserted into the sliding part of the limit calabash hole 82 and slides upward synchronously. The bolt head at the rear end of the double-headed screw 64 is stuck outside the sliding part, so that the interlocking dial 61 defines the installation position of the modular circuit breaker 4 and prevents the modular circuit breaker 4 from being removed in the closed state.

[0065] Preferably, the aperture of the insertion part at the lower end of the limit calabash hole 82 is larger than the diameter of the screw head of the double-headed screw 64, and the width of the sliding part at the upper end of the limit calabash hole 82 is smaller than the diameter of the screw head of the double-headed screw 64. The interlocking dial 61 is of a "U" - shaped structure and can be attached and covered outside the modular circuit breaker 4 to save space.

[0066] Preferably, the electromagnetic protection interlocking mechanism 7 includes a baffle 71, an electromagnetic lock 74 and an electric control mechanism 42. The baffle 71 is used to shield the operating part of the movable connection component module 5, so as to achieve the protection effect that the modular circuit breaker 4 body cannot be disassembled in the closed state. The electric control mechanism 42 is used to realize the opening and closing actions of the electric control switch modular circuit breaker 4. The electromagnetic lock 74, the baffle 71 and the electric control mechanism 42 realize the electric control interlocking protection. A hanging plate hole 84 is opened at the front end of the fixed plate 83, and a buckle 72 is provided on the inner side of the baffle 71 of the electromagnetic protection interlocking mechanism 7. The buckle 72 is hung and installed in the hanging plate hole 84. An interlocking pressure plate 73 is provided at the inner lower end of the baffle 71. The electromagnetic lock 74 of the electromagnetic protection interlocking mechanism 7 is installed at the upper end of the fixed plate 83 below. The electromagnetic lock 74 is connected to the modular circuit breaker 4, and the lock tongue 75 of the electromagnetic lock 74 is pressed against the upper end of the interlocking pressure plate 73. The electric control mechanism 42 is installed on the operating end face of the modular circuit breaker 4. The baffle 71 is mounted on the fixed plate 83, and the lock tongue 75 of the electromagnetic lock 74 is placed on the interlocking pressure plate 73. The electric control mechanism 42 controls the modular circuit breaker 4 to close and simultaneously energizes the connected electromagnetic lock 74. The lock tongue 75 is pressed against the interlocking pressure plate 73, so that the baffle 71 is firmly mounted on the fixed plate 83, and the baffle 71 cannot be removed in the closed state.

[0067] Preferably, the bolt head of the dynamic combination bolt 51 of the dynamic connection component module 5 is a four-corner bolt head 52, the outer surface of the four-corner bolt head 52 is coated with insulating paint, and the connecting end of the insulating connection head 53 combined with the dynamic combination bolt 51 is provided with a four-corner combination groove 54, the insulating connection head 53 is combined with the four-corner bolt head 52 and installed on the dynamic combination bolt 51 through the four-corner combination groove 54 and drives the dynamic combination bolt 51 to rotate, and the operating end of the insulating connection head 53 is provided with an outer four-corner operating end 55, and the outer four-corner operating end 55 extends outward from the operating end of the dynamic connection component module 5. On the outside, the four-corner bolt head 52 of the dynamic combination bolt 51 and the insulating connector 53 are provided with a hexagonal unlocking hole 56, and the combined ends of the four-corner bolt head 52 and the insulating connector 53 are provided with a transversely penetrating combination positioning hole 57. The combination positioning hole 57 can help the installer to accurately install the insulating connector 53 on the dynamic combination bolt 51, so that the four-corner bolt head 52 is aligned with the hexagonal unlocking hole 56 of the insulating connector 53. Furthermore, a combination pin can be installed in the combination positioning hole 57 to firmly combine the insulating connector 53 with the dynamic combination bolt 51, thereby improving the transmission stability of the rotation operation.

[0068] Preferably, the static connection component module 1, the hinge interlock protection mechanism 2, the anti-misoperation interlock bottom plate 3, the modular circuit breaker 4, the dynamic connection component module 5 and the closing interlock mechanism 6 form a manual interlock protection structure, and the static connection component module 1, the hinge interlock protection mechanism 2, the anti-misoperation interlock bottom plate 3, the modular circuit breaker 4, the dynamic connection component module 5 and the electromagnetic protection interlock mechanism 7 form an electric control interlock protection structure.

[0069] Preferably, the coupler quick-connect panel provided on the mounting base plate 8 is an inclined-angle access structure, and the insertion end of the coupler quick-connect panel is inclined downward, which can effectively reduce the installation stress caused when the cable is combined with the insertion end, and improve the connection safety and the protection effect on the insertion end. A flip-type protective cover 85 is provided above the extended cable ear provided on the mounting base plate 8, which can effectively protect the cable ear. When connection is needed, it only needs to be flipped open. After the flip-type protective cover 85 is flipped up, the cable ear can be locked to the copper busbar lap joint hole with bolts. When connection is not needed, covering the flip-type protective cover 85 can avoid accidental touch and accidents, and can have both operation convenience and protection safety at the same time.

[0070] First Embodiment:

[0071] During installation, the static connection component module 1 is installed at the connection and installation position of the mounting base plate 8 of the cabinet body, and the hinge interlock protection mechanism 2 is installed on the mounting base plate 8 and disposed between the static connection component modules 1. The hinge interlock protection mechanism 2 is in a stretched state, and the insulating guard plates 28 at both ends shield the front ends of the dynamic component connection holes of the static connection component module 1, covering the connection copper busbar.

[0072] Install the modular circuit breaker 4 onto the anti-misoperation interlock base plate 3 according to the combination direction. Insert and combine through the anti-misoperation one-way card hole 31 on the anti-misoperation interlock base plate 3 and the anti-misoperation positioning screw 81 on the mounting base plate 8, and install the anti-misoperation interlock base plate 3 onto the mounting base plate 8. Realize the installation interlock through the combination of the interlock guide plate 34 of the anti-misoperation interlock base plate 3 and the interlock stud 24 of the hinge interlock protection mechanism 2, so that the insulating guard plates 28 at both ends contract to the inside of the moving component connection hole of the static connection component module 1, and expose the moving component connection hole of the static connection component module 1 to the connectable combination state. Install the moving connection component module 5 onto the modular circuit breaker 4 and combine and connect it with the static connection component module 1. Combine the interlock tab 61 of the closing interlock mechanism 6 with the closing and opening tab 41 of the modular circuit breaker 4, and then install it through the interlock sliding hole 32 of the anti-misoperation interlock base plate 3 into the limit gourd hole 82 of the mounting base plate 8 to complete the installation of the closing interlock mechanism 6. Then install the electromagnetic lock 74 onto the fixing plate 83, with the lock tongue 75 of the electromagnetic lock 74 in a movable state. Then hang and install the buckle 72 into the hanging plate hole 84, install the baffle 71 onto the fixing plate 83, place the lock tongue 75 on the interlock pressure plate 73, and then install the electric control mechanism 42 onto the operating end face of the modular circuit breaker 4 to complete the installation of the electromagnetic protection interlock mechanism 7.

[0073] Close the modular circuit breaker 4. The closing and opening tab 41 drives the interlock tab 61 to move through the interlock jack 62. The sliding guide stud 63 of the interlock tab 61 moves upward along the sliding guide hole 33, and the double-headed screw 64 is stuck into the sliding part of the limit gourd hole 82, and the interlock tab 61 is stuck on the mounting base plate 8 to realize the manual closing protection interlock, so that the modular circuit breaker 4 cannot be disassembled when in the closed state.

[0074] The electric control mechanism 42 controls the modular circuit breaker 4 to close, the electromagnetic lock 74 is powered on, and the lock tongue 75 of the electromagnetic lock 74 presses on the interlock pressure plate 73, so that the baffle 71 is firmly installed on the fixing plate 83 to realize the electric control closing protection interlock, and the baffle 71 cannot be removed when in the closed state.

[0075] When relevant operations such as inspection and maintenance are required, manually toggle the closing and opening tab 41 to turn the modular circuit breaker 4 to the open state, drive the interlock tab 61 to move to the unlocking position, the double-headed screw 64 moves from the sliding part at the upper end of the limit gourd hole 82 to the insertion part at the lower end, pull out the double-headed screw 64 from the insertion part, and remove the interlock tab 61.

[0076] The electric control mechanism 42 controls the modular circuit breaker 4 to the open state, the electromagnetic lock 74 is powered off, the lock tongue 75 of the electromagnetic lock 74 releases the pressing interlock on the interlock pressure plate 73, and the operator reversely removes the baffle 71 from the fixing plate 83.

[0077] Continue to remove the moving connection component module 5. Lift the anti-misoperation interlock base plate 3 installed with the modular circuit breaker 4 upwards so that the anti-misoperation one-way card hole 31 is pulled out from the anti-misoperation positioning screw 81. At the same time, the guard plate interlock card hole 35 of the interlock guide plate 34 drives the interlock stud 24 upwards to move along the interlock guide hole 25. By rotating the connecting rod 23, the driving connecting rod 26 drives the protective connecting rod 27 to extend towards both ends. The protective connecting rod 27 makes the insulating guard plate 28 extend synchronously to the front end of the moving component connection hole of the static connection component module 1, covering the moving component connection hole of the static connection component module 1 to prevent the copper busbar of the static connection component module 1 from being exposed, forming the protective interlock of the insulating guard plate 28. Operators can perform inspection and maintenance safely.

[0078] Second Embodiment:

[0079] This embodiment is similar to the first embodiment. The difference is that the bolt head of the moving combined bolt 51 in the moving connection component module 5 of this embodiment is designed as a four-corner bolt head 52. The outer surface of the four-corner bolt head 52 is coated with insulating paint. The connecting end of the insulating connection head 53 combined with the moving combined bolt 51 is provided with a four-corner combined groove 54. The insulating connection head 53 is combined and installed on the moving combined bolt 51 through the four-corner combined groove 54 and drives the moving combined bolt 51 to rotate. The operating end of the insulating connection head 53 is provided with an outer four-corner operating end 55, and the outer four-corner operating end 55 extends outside the operating end of the moving connection component module 5. An inner hexagon unlocking hole 56 is provided in the four-corner bolt head 52 of the moving combined bolt 51 and the insulating connection head 53.

[0080] Through the outer four-corner operating end 55, operators can withstand a higher operating torque when installing the moving connection component module 5, avoiding damage to the moving connection component module 5 during operation and ensuring the integrity of the operation. The combined ends of the four-corner bolt head 52 and the insulating connection head 53 are both provided with combined positioning holes 57. In case of emergency, operators can insert an insulating hexagon tool into the combined positioning hole 57 to combine with the four-corner bolt head 52 and directly operate the four-corner bolt head 52 to rotate, enabling live emergency removal operations and ensuring construction safety.

[0081] The combined positioning hole 57 can help installers accurately install the insulating connection head 53 on the moving combined bolt 51, aligning the four-corner bolt head 52 with the inner hexagon unlocking hole 56 of the insulating connection head 53. Further, a combined pin can be installed in the combined positioning hole 57 to make the insulating connection head 53 and the moving combined bolt 51 more firmly combined together, improving the transmission stability of the rotational operation.

[0082] Third Embodiment:

[0083] This embodiment is similar to the foregoing embodiment, except that in this embodiment, the coupler quick-connect panel provided on the mounting base plate 8 is an inclined-angle access structure, and the insertion end of the coupler quick-connect panel is inclined downward. When the operator connects the cable to the insertion end, the installation and insertion are more convenient, and at the same time, the installation stress caused during the access combination can be effectively reduced.

[0084] In this embodiment, a flip-type protective cover 85 is provided above the extended cable lug provided on the mounting base plate 8. When the operator connects the cable lug, only need to flip up the flip-type protective cover 85, then the cable lug can be locked to the copper busbar lap joint hole with bolts to complete the connection combination. After disconnection, covering the flip-type protective cover 85 can protect the cable lug and avoid accidental touch and accidents.

[0085] Furthermore, a user-friendly low-voltage switchgear with a safety protection interlock device of the present application can also connect the above-mentioned safety protection multi-interlock device to the power generation side power supply through the busbar interface of the busbar clamp above the mounting base plate 8.

[0086] Obviously, the above-mentioned embodiments of the present invention are merely examples for clearly explaining the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A user-friendly low-voltage switchgear with a safety protection interlock device, characterized in that, It includes a static connection component module (1), a hinge interlock protection mechanism (2), a misoperation prevention interlock base plate (3), a modular circuit breaker (4), a dynamic connection component module (5), a closing interlock mechanism (6), and an electromagnetic protection interlock mechanism (7) provided on the installation base plate (8) of the cabinet body. The static connection component module (1) is fixedly arranged on the installation base plate (8). The hinge interlock protection mechanism (2) is installed on the assembly end face of the installation base plate (8). The modular circuit breaker (4) is installed on the misoperation prevention interlock base plate (3). The misoperation prevention interlock base plate (3) is combined with the misoperation prevention positioning screw (81) on the installation base plate (8). The misoperation prevention interlock base plate (3) and the hinge interlock protection mechanism (2) are interlocked and combined with each other. The dynamic connection component module (5) is connected and combined with the static connection component module (1) and the modular circuit breaker (4). The closing interlock mechanism (6) is combined and interlocked with the modular circuit breaker (4) and installed on the misoperation prevention interlock base plate (3). The electromagnetic protection interlock mechanism (7) is connected to the modular circuit breaker (4). The electromagnetic protection interlock mechanism (7) is installed on the fixing plate (83) of the installation base plate (8). The hinge interlock protection mechanism (2) includes a cover plate (21). A rotating connecting rod (23) is installed on the rotating stud (22) of the cover plate (21). The interlock stud (24) of the rotating connecting rod (23) is slidably arranged in the interlock guiding hole (25) of the cover plate (21). The interlock guiding hole (25) is inclined. The two ends of the rotating connecting rod (23) are rotatably connected with a transmission connecting rod (26). One end of the transmission connecting rod (26) is rotatably connected with a protection connecting rod (27). An insulating guard plate (28) is installed at the protruding end of the protection connecting rod (27). An interlock guiding plate (34) is installed on the interlock side of the misoperation prevention interlock base plate (3). A guard plate interlock card hole (35) is formed on the interlock guiding plate (34). The guard plate interlock card hole (35) and the interlock stud (24) are in sliding guiding cooperation. Installation plates are arranged on both sides of the misoperation prevention interlock base plate (3). A misoperation prevention one-way card hole (31) and an interlock sliding hole (32) are formed on the installation plate. The misoperation prevention one-way card hole (31) and the misoperation prevention positioning screw (81) are in an insertion and clamping combination. A sliding guiding hole (33) is arranged at the position corresponding to the interlock sliding hole (32) on the side of the misoperation prevention interlock base plate (3). The sliding guiding hole (33) is combined with the closing interlock mechanism (6).

2. The user-friendly low-voltage switchgear with a safety protection interlock device according to claim 1, characterized in that, When the insulating guard plate (28) contracts, it is arranged inside the moving component connection hole of the static connection component module (1). After the insulating guard plate (28) extends, it shields and is arranged at the front end of the moving component connection hole of the static connection component module (1). The weight of the insulating guard plate (28) located below is greater than the weight of the insulating guard plate (28) located above.

3. A user-friendly low-voltage switchgear with a safety protection interlock device according to claim 1, characterized in that, A connecting tenon (36) is provided at the assembly end of the interlocking guide plate (34), and the interlocking guide plate (34) is fixedly assembled on the interlocking assembly side of the anti-misoperation interlocking base plate (3) through the connecting tenon (36) and the tenon-and-mortise hole (37) of the anti-misoperation interlocking base plate (3).

4. A user-friendly low-voltage switchgear cabinet with a safety protection interlock device according to claim 1, characterized in that, The closing interlock mechanism (6) comprises an interlocking paddle (61) arranged outside the modular circuit breaker (4), an interlocking plug hole (62) being provided in the middle of the interlocking paddle (61), the opening and closing paddle (41) of the modular circuit breaker (4) being inserted into the interlocking plug hole (62), sliding guide studs (63) being installed on both sides of the interlocking paddle (61), the sliding guide studs (63) and the sliding guide holes (33) forming a sliding guide combination, the sliding guide holes (33) guiding and limiting the sliding travel of the interlocking paddle (61), A stud screw (64) is installed at the interlocking end of the interlocking paddle (61); the stud screw (64) passes through the interlocking guide hole (25) and is slidably installed in a limiting gourd hole (82) on the mounting base plate (8); the limiting gourd hole (82) is a structure in which the insertion portion at the lower end is wide and the sliding portion at the upper end is narrow; the sliding portion of the limiting gourd hole (82) is in sliding fit with the screw rod of the stud screw (64).

5. A user-friendly low-voltage switchgear cabinet with a safety protection interlock device according to claim 4, characterized in that, The hole diameter of the lower end insertion portion of the limiting gourd hole (82) is larger than the diameter of the screw head of the stud screw (64), the width of the upper end sliding portion of the limiting gourd hole (82) is smaller than the diameter of the screw head of the stud screw (64), and the interlocking paddle (61) is a "凵" type structure.

6. A user-friendly low-voltage switchgear cabinet with a safety protection interlock device according to any one of claims 1 or 4, characterized in that, The electromagnetic protection interlocking mechanism (7) comprises a baffle (71), an electromagnetic lock (74) and an electric control mechanism (42); a hanging plate hole (84) is formed at the front end of the fixing plate (83); a buckle (72) is provided on the inner side of the baffle (71) of the electromagnetic protection interlocking mechanism (7); the buckle (72) is mounted in the hanging plate hole (84); an interlocking pressure plate (73) is provided at the inner lower end of the baffle (71); the electromagnetic lock (74) of the electromagnetic protection interlocking mechanism (7) is mounted on the upper end of the fixing plate (83) below; the electromagnetic lock (74) is connected to the modular circuit breaker (4); a lock tongue (75) of the electromagnetic lock (74) is arranged to fit and press against the upper end of the interlocking pressure plate (73); and the electric control mechanism (42) is mounted on the operating end face of the modular circuit breaker (4).

7. The user-friendly low-voltage switchgear cabinet with a safety protection interlock device according to claim 6, characterized in that, The bolt head of the movable combined bolt (51) of the movable connection component module (5) is a four-corner bolt head (52). The outer surface of the four-corner bolt head (52) is coated with insulating paint. The connecting end of the insulating connection head (53) combined with the movable combined bolt (51) is provided with a four-corner combined groove (54). The insulating connection head (53) is combined and installed on the movable combined bolt (51) through the four-corner combined groove (54) and drives the movable combined bolt (51) to rotate. The operating end of the insulating connection head (53) is provided with an outer four-corner operating end (55). The outer four-corner operating end (55) extends outside the operating end of the movable connection component module (5). The combined ends of the four-corner bolt head (52) and the insulating connection head (53) are both provided with a horizontally penetrating combined positioning hole (57). The four-corner bolt head (52) of the movable combined bolt (51) and the insulating connection head (53) are provided with an internal hexagonal unlocking hole (56).

8. A user-friendly low-voltage switchgear with a safety protection interlock device according to claim 7, characterized in that, The static connection component module (1), the hinge interlock protection mechanism (2), the anti-misoperation interlock bottom plate (3), the modular circuit breaker (4), the movable connection component module (5) and the closing interlock mechanism (6) form a manual interlock protection structure. The static connection component module (1), the hinge interlock protection mechanism (2), the anti-misoperation interlock bottom plate (3), the modular circuit breaker (4), the movable connection component module (5) and the electromagnetic protection interlock mechanism (7) form an electric control interlock protection structure.

9. A user-friendly low-voltage switchgear cabinet with a safety protection interlock device according to claim 7, characterized in that, The coupler quick-connect panel arranged on the mounting base plate (8) is an inclined-angle access structure. The insertion end of the coupler quick-connect panel is arranged to incline downward. A flip-type protective cover (85) is arranged above the extended cable ear arranged on the mounting base plate (8).

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