Removable three-position operating function unit

Abstract

The present invention relates to a removable three-position operating functional unit, wherein the main circuit body reversing plug comprises a plug portion located on the front of the plug mounting plane and a terminal reversing portion located on the back of the plug mounting plane, which reverses the terminal to one side of the plug end of the plug portion. The interphase center of the main circuit plug is arranged corresponding to the interphase center of the corresponding phase of the circuit breaker. In addition, a removable operating structure is provided, including upper and lower operating ports formed by a double-column rotating shaft assembly, and operating tools inserted into the upper and lower operating ports use the lever principle to operate the removable assembly of the functional unit. The beneficial effects of the present invention are: saving materials and labor, greatly improving the degree of processability, and achieving the high-standard technical goal of 1000V insulation voltage between the phase center of the connection between the plug and the circuit breaker, with extremely high practicality and considerable economic value in industrial applications. The operating mechanism has a fast operation mode for connection and exit, and a novel structural design concept.

Description

Technical Field

[0001] The present invention relates to the technical field of low-voltage complete equipment, in particular to a main circuit body reversing plug and a main circuit connection structure of the main circuit body reversing plug connected to a circuit breaker, a functional unit removable assembly and a removable functional unit. Background Art

[0002] Low-voltage complete equipment comes in three structural types: fixed, pluggable, and drawer. Fixed types are primarily used for high-current equipment exceeding 800A, pluggable types are primarily used for 63A to 630A separation units, and drawer types are primarily used for 32A to 800A separation units. Fixed and pluggable types use a rigid connection to the vertical busbar, while the drawer type uses a plug for a flexible connection to the vertical busbar.

[0003] The circuit breaker of the plug-in separation unit adopts a plug-in switch, which is equipped with an auxiliary base for connecting the plug-in switch. The base is hard-connected to the vertical busbar. There is a plug on the plug-in switch and the base is a spring pressure socket.

[0004] The operation of the drawer-type structure requires a propulsion mechanism and an interlocking mechanism. The main circuit plug is flexibly connected to the vertical busbar. The drawer installation assembly is operated by the propulsion mechanism and has three-position functions of connection, test, and separation. A fixed switch is used.

[0005] Plug-in separation units are widely used in the power distribution function circuits of low-voltage complete sets of equipment.

[0006] The drawer type is widely used in motor control circuits, and the power distribution circuit accounts for a larger proportion than the motor control circuit.

[0007] The plug-in separation unit of low-voltage complete equipment is the mainstream application equipment. The manufacturing process of the separation unit is to connect the plug-in switch with the base, and the base is hard-connected to the vertical busbar.

[0008] The base of the plug-in separation unit of the low-voltage complete equipment is installed on the rear panel of the cabinet. The incoming line end of the base is connected to the vertical busbar through a hole. The outgoing line connector of the base is fixed to the cabinet with a pillar to provide the user with an outgoing line connection. The process manufacturing cost is very high.

[0009] Manufacturing process of plug-in separation unit connectors: Busbar punching is carried out according to the phase-to-phase size of the unit module base. The busbar punching process is very labor-intensive. The busbar punching of each cabinet may not be universal and must be managed by label. The outgoing connectors of 400A and 630A are suspended far from the rear panel of the cabinet due to the size of the current transformer. The upper cable is heavy, so there must be a structural support at the rear of the cabinet to ensure the strength of the outgoing hanging cable. Sheet metal structure is required.

[0010] During installation, the plug-in switch is connected to the base, and the switch is fastened to the base in a balanced manner using 4 screws. The installation work is done in the cabinet unit room, and the installation time is relatively long, especially for the upper and lower cabinet units, which is a bit labor-intensive and time-consuming.

[0011] The base structure of the plug-in switch also has a spring plug, but due to the small center of the switch and the limited space between the base phases, the base current carrying capacity design will be relatively small. The switch and the base cannot dissipate heat when connected, and the operating temperature rise is relatively high.

[0012] Plug-in maintenance is difficult, and it is difficult to pull out the switch. This is a major defect in application maintenance, especially for the units at the bottom of the cabinet.

[0013] The plug-in switch is connected to the base in a coordinated manner. The current transformer can only be arranged at the outlet terminal at the rear of the cabinet. When the current transformer is arranged at the outlet terminal at the rear of the cabinet, it is not reasonable to connect the current transformer signal line from the rear of the cabinet to the instrument module on the cabinet door. The current transformer arranged at the outlet terminal at the rear of the cabinet occupies the depth of the rear of the cabinet. When the user cable is strung from the bottom of the cabinet, structural problems may occur.

[0014] After more than ten years of application, the plug-in partition unit has the above structural deficiencies, which are well known to manufacturers and users. This brief description is based on feedback from manufacturers and users.

[0015] Furthermore, the combined cost of plug-in partitions and base components exceeds the manufacturing cost of drawer-type systems, yet their structural performance is inferior to that of drawer-type and removable systems. In particular, overheating and burnout of the base require power outages for replacement, leading to production losses for users.

[0016] Looking at the technical deficiencies in the final assembly technology of the low-voltage drawer-type functional unit system structure, the drawer-type main circuit plug structure is arranged in a straight line between the center of the vertical busbar, which is inconsistent with the connection surface of the circuit breaker. A transition switch is required to align the center of the circuit breaker before connection. This complex process, the connector specifications are numerous, the connectors use a lot of copper, and the electrical clearance between the phases cannot meet the high insulation voltage standard of 1000V (unless insulating sleeves are installed). Manufacturers have always felt that this structure is not the best solution.

[0017] The drawer-type functional unit structure unit door is connected to the drawer. Since the drawer functional unit uses input and output plugs, the installation position of the input and output plugs is not in the center of the drawer, and the pushing mechanism can only be arranged in the center of the drawer. There are main and auxiliary circuit plugs at the output end, and only the main circuit plug at the input end. Therefore, when pushing the drawer to connect (due to the unequal pressure of the input and output plugs, and potential structural layout limitations), the potential technical problem of the functional unit being offset to the left and right due to the resistance of the plug pressure is bound to exist when the drawer functional unit is pushed to the connection stroke. The left side of the unit room door will produce a gap that is greater than the standard IR41 protection level of 1.0mm (generally there will be 2 to 2.5mm), which has always been a structural technical problem that is difficult for manufacturers to solve. (There is no such technical problem when the plug-in unit door is installed on the frame).

[0018] The drawer-type functional unit door is mounted on the frame of the Schneider B cabinet, and the domestic GCK cabinet door is also mounted on the cabinet body (the functional unit is operated with the door open). However, these two drawer-type structures lack a three-position operation interlock mechanism, which also has functional defects and reduces the feasibility of operational protection safety. During operation and maintenance, the drawer is removed from the unit room.

[0019] A technical analysis of the structural technology of plug-in (distribution function) separation units for low-voltage complete sets of equipment, the comprehensive defects of the existing application structure status, the high cost, and other comprehensive structural defects. The main technical goal of ensuring non-stop maintenance of equipment operation failures has not been fully achieved. Reduce costs (materials) and (labor costs), simplify the manufacturing process structure, and improve the versatility of manufacturing components. In current industry applications, drawer-type applications in distribution circuits also occupy a large part of the usage, but the materials and processes of the plug structure type connection switches are relatively cumbersome. The distribution circuit functional unit only requires the application function of the main circuit power connection, and the application of flexible connection between the plug and the busbar, and the plug terminal and switch connection process, is material-intensive, has many parts, and the connection process is also complicated. To solve the process of connecting the plug structure to the circuit breaker, it is necessary to optimize the plug structure. Key points of the plug structure: (mainly the plug structure terminal). Only by innovating the main circuit plug structure terminal body to meet the plug module installation reversing connection structure with the installation center consistent with the phase center of the circuit breaker, and using the corresponding matching of the plug module installation structure and the circuit breaker installation type in manufacturing, can the structural principle of simplified connection process, material saving and high component versatility be achieved to completely solve the connection process difficulties in industry application manufacturing. Summary of the Invention

[0020] The technical problem to be solved by the present invention is to provide a main circuit body reversing plug and a main circuit connection structure for connecting the main circuit body reversing plug to a circuit breaker, simplifying the process and installation method, reducing the number of connection points, and shortening the front and rear installation space distance. In addition, a removable operating structure is provided to achieve a simple and fast operating structure type.

[0021] The technical solution adopted by the present invention to solve its technical problems is: a main circuit body reversing plug, which is divided into a plug part located on the front side of the plug installation plane and a terminal reversing part located on the back side of the plug installation plane. The terminal reversing part is a horizontal extension structure connected to the plug part, which reverses the terminal to one side of the plug end of the plug part. The plug part and the terminal reversing part are insulated and isolated by an insulating shell, and the plug end and the terminal are exposed from the insulating shell.

[0022] It is further defined that the specific structure of the main circuit body reversing plug is as follows: it includes an insulating shell and a plug unit insulated and isolated by the insulating shell, the plug unit includes a main circuit plug and a terminal block, the plug end is the front end of the main circuit plug, the wiring end is the rear end of the terminal block, the front end of the terminal block is connected to the rear end of the main circuit plug, and a transverse extension section is between the front end and the rear end of the terminal block. The front end and the rear end of the terminal block are distributed on the front and back sides of the transverse extension section and are in a vertical relationship. The insulating shell includes a plug part and a transverse extension part. The main circuit plug is installed in the plug part of the insulating shell, constituting the plug part of the main circuit body reversing plug, the transverse extension section of the terminal block is installed in the transverse extension part of the insulating shell and the rear end of the terminal block is exposed from the transverse extension part of the insulating shell, constituting the wiring terminal reversing part.

[0023] A main circuit connection structure for connecting a main circuit body reversing plug to a circuit breaker includes a circuit breaker and a main circuit plug. Phases arranged from top to bottom on the incoming line side of the circuit breaker are connected to the main circuit plugs of the corresponding phases via conductive connectors. The main circuit plugs of the phases on the incoming line side are arranged in layers from top to bottom, and the horizontal phase spacing of the plug ends of the main circuit plugs of the phases is consistent with the phase spacing of the vertical busbars, so that they are directly plugged into the vertical busbars. The main circuit plugs of all or some phases are the above-mentioned main circuit body reversing plugs.

[0024] It is further defined that the interphase centers of the main circuit plug are arranged correspondingly to the interphase centers of the corresponding phases of the circuit breaker, so that the main circuit plug and the corresponding phases of the circuit breaker can be connected one by one by arranging the conductive connectors in layers from top to bottom.

[0025] It is further defined that the incoming line side of the circuit breaker has phase A, phase B and phase C arranged from top to bottom, wherein the main circuit plugs of phase A and phase B are conventional structure main circuit plugs, the main circuit plug of phase C is a main circuit body reversing plug, and the connection terminals of the main circuit plugs of phase A and phase C are arranged in a row from top to bottom; or, the main circuit plug of phase A is a conventional structure main circuit plug, the main circuit plugs of phase B and phase C are main circuit body reversing plugs, and the connection terminals of the main circuit plugs of phase A, phase B and phase C are arranged in a row from top to bottom; or, the incoming line side of the circuit breaker has phase A, phase B, phase C and phase N arranged from top to bottom, the main circuit plug of phase A is a conventional structure main circuit plug, the main circuit plugs of phase B, phase C and phase N are main circuit body reversing plugs, and the connection terminals of the main circuit plugs of each phase are arranged in a row from top to bottom.

[0026] A removable functional unit assembly for low-voltage complete equipment adopts the above-mentioned main circuit body reversing plug connection structure of the circuit breaker, including a circuit breaker and a removable functional unit rack. The circuit breaker is horizontally mounted on the removable functional unit rack, and a vertically arranged rack rear end plate is provided at the rear end of the removable functional unit rack. The main circuit plug is mounted on the rack rear end plate. The plug end of the main circuit plug is plugged into and connected to the vertical busbar, and the connection end of the main circuit plug is connected to the circuit breaker. The plug connection relationship between the main circuit plug and the main circuit is connected or disconnected by horizontally moving the removable functional unit rack.

[0027] It is further defined that the front of the functional unit movable rack has an upper operating port of the operating mechanism, and the functional unit movable rack is operated by using the lever principle and the plug-in tool and the lower operating port on the unit room shelf. The front and rear sides of the upper operating port serve as the lever force points a when moving the functional unit movable rack.

[0028] It is further defined that the upper operating port is composed of a double-column shaft assembly, which includes two shaft columns arranged in front and behind, respectively serving as the lever force point a of the plug-in and pull-out tools. The two plug-in and pull-out columns are arranged horizontally and fixed to the rack base plate of the removable rack of the functional unit through a bracket. The two plug-in and pull-out columns are higher than the upper plane of the rack base plate.

[0029] A removable functional unit of a low-voltage complete switchgear cabinet comprises a unit chamber and a removable functional unit assembly of the above-mentioned low-voltage complete equipment within the unit chamber. A lower operating port is provided on a layer plate of the unit chamber. When an insertion tool is inserted into the upper and lower operating ports, the front and rear sides of the lower operating port respectively serve as lever force points a for moving the removable rack of the functional unit.

[0030] It is further defined that the upper operating port is composed of a double-column rotating shaft assembly, the double-column rotating shaft assembly includes two rotating shaft columns arranged in front and behind, which serve as the lever force point a of the plug-in and pull-out tools respectively, the two plug-in and pull-out columns are arranged horizontally and fixed to the rack bottom plate of the movable rack of the functional unit through a bracket, and the two plug-in and pull-out columns are higher than the upper plane of the rack bottom plate, and the lower operating port is also composed of a double-column rotating shaft assembly, and the double-column rotating shaft assembly of the lower operating port is fixed to the lower part of the unit room shelf, and the two rotating shaft columns of the lower operating port are lower than the lower plane of the unit room shelf.

[0031] It is further defined that the front part of the movable assembly of the functional unit is also equipped with a position interlocking mechanism, and the front part of the unit room layer plate has a position positioning piece used in conjunction with the position interlocking mechanism. The position interlocking mechanism includes an unlocking angle plate, a spring and an interlocking plate, and the unlocking angle plate can be rotatably arranged, one end of the unlocking angle plate is an unlocking end, and the other end is a positioning end, and a positioning shaft is provided on the positioning end. One side of the position positioning piece has a positioning groove arranged from front to back for two-position positioning or three-position positioning, and the unlocking angle plate rotates under the action of the spring so that the positioning shaft is embedded in the positioning groove to achieve position positioning. The unlocking end of the unlocking angle plate is manually pushed to rotate the unlocking angle plate in the opposite direction to disengage the positioning shaft from the positioning groove to achieve position unlocking. The interlocking plate is connected to the unlocking angle plate. When the unlocking angle plate rotates to the position positioning state, the unlocking angle plate drives the interlocking plate to cover the upper operating port and lock the operating mechanism. When the unlocking angle plate rotates to the position unlocking state, the unlocking angle plate drives the interlocking plate to give up the upper operating port and unlock the operating mechanism.

[0032] It is further defined that the interlock plate is hinged on the positioning end of the unlocking angle plate, and the unlocking angle plate drives the interlock plate to block or give up the upper operating port through a horizontal movement. The unlocking end of the unlocking angle plate is provided with a padlock fitting hole, and the front part of the functional unit movable assembly is also provided with a padlock bracket, and the padlock bracket has a padlock fitting hole. The padlock bracket is located on the outside of the unlocking end of the unlocking angle plate, and is used to lock the unlocking angle plate by padlocking when the unlocking angle plate is rotated to the position positioning state. The front part of the functional unit movable assembly is also provided with a closing interlocking hole, and the interlocking plate also has a closing interlocking hole. When the unlocking angle plate is reset to the position positioning state, the closing interlocking hole of the functional unit movable assembly corresponds to the closing interlocking hole of the interlocking plate. When the unlocking angle plate is rotated to the position unlocking state, the closing interlocking hole of the functional unit movable assembly is staggered with the closing interlocking hole of the interlocking plate.

[0033] The beneficial effects of the present invention are: saving materials and labor, greatly improving the degree of process and achieving the high standard technical goal of 1000V phase-to-phase center insulation voltage between the plug and the circuit breaker. It is highly practical and has considerable economic value in industrial applications.

[0034] It can be widely used in low-voltage power distribution systems and motor protection control systems. The main circuit connection structure of the main circuit body reversing plug connected to the circuit breaker is an innovative concept with high practicality. The position interlocking mechanism of the door-type functional unit provides great convenience for user maintenance.

[0035] The operating mechanism is quick to connect and exit, and has a novel structural design concept. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The present invention will be further described below with reference to the accompanying drawings and examples;

[0037] Figure 1 It is a structural diagram of the L1 plug module of the present invention;

[0038] Figure 2 It is a structural diagram of the L2 plug module of the present invention;

[0039] Figure 3 It is a structural diagram of the L3 plug module of the present invention;

[0040] Figure 4 It is a structural diagram of the L4 plug module of the present invention;

[0041] Figure 5 This is a schematic diagram of the installation arrangement structure of the first main circuit plug of the present invention;

[0042] Figure 6 This is a schematic diagram of the installation arrangement structure of the second main circuit plug of the present invention;

[0043] Figure 7 This is a schematic diagram of the installation arrangement structure of the third main circuit plug of the present invention;

[0044] Figure 8 This is a structural diagram of a main circuit plug connection circuit breaker of an existing drawer-type functional unit;

[0045] Figure 9 yes Figure 5 A structural diagram of connecting the main circuit plug with the circuit breaker;

[0046] Figure 10 yes Figure 6 A structural diagram of connecting the main circuit plug with the circuit breaker;

[0047] Figure 11 is Figure 9 Schematic diagram of the structure in which current transformers and insulation isolation components are installed;

[0048] Figure 12 1. It is a front structural diagram of the position interlocking mechanism in the separated position;

[0049] Figure 13 It is a schematic diagram of the reverse structure of the position interlocking mechanism in the separation position;

[0050] Figure 14 This is a schematic diagram of the front structure of the position interlocking mechanism in the test position;

[0051] Figure 15 It is a schematic diagram of the reverse structure of the position interlocking mechanism in the test position;

[0052] Figure 16 It is a front structural diagram of the position interlocking mechanism in the connected position;

[0053] Figure 17 It is a schematic diagram of the reverse structure of the position interlocking mechanism in the connected position;

[0054] Figure 18 This is a schematic diagram of the installation structure of the position interlocking mechanism on the movable rack of the functional unit;

[0055] Figure 19 This is a schematic diagram of the assembly of the lower operating port and the positioning member of the operating mechanism;

[0056] Figure 20 It is a state diagram of the removable functional unit in the separated position;

[0057] Figure 21 It is the state diagram of the test position of the removable functional unit;

[0058] Figure 22 It is the state diagram of the removable functional unit when it is in the connection position;

[0059] Figure 23 This is a diagram of the initial state of the removable functional unit when the plug-in tool is moved from the test position to the connection position;

[0060] Figure 24 yes Figure 23 AA cross-section of

[0061] Figure 25 This is a state diagram of operating the plug-in tool to advance to the connection position;

[0062] Figure 26 It is a diagram of the initial state when the plug-in and pull-out tool is removed from the connection position;

[0063] Figure 27 This is a state diagram of operating the plug-in and pull-out tool to withdraw to the test position;

[0064] Figure 28 It is a schematic diagram of unlocking the corner plate and locking it with a padlock in the separated position;

[0065] Figure 29 It is a schematic diagram of the angle plate being unlocked and locked with a padlock in the test position;

[0066] Figure 30 This is a schematic diagram of the switch in the closed state;

[0067] Figure 31 This is a schematic diagram of the switch being opened and padlocked;

[0068] Figure 32 This is a schematic diagram of the installation of the limiting guide component at the bottom of the movable assembly of the functional unit;

[0069] Figure 33 This is the rear view of the functional components of the unit room in the final assembly and connection state;

[0070] Figure 34 This is the cabinet assembly panel diagram.

[0071] In the figure, 1. Insulating housing, 2. Plug end, 3. Wiring end, 4-1. L1 plug module, 4-2. L2 plug module, 4-3. L3 plug module, 4-4. L4 plug module, 5. Circuit breaker, 6. Conductive connector, 7. Current transformer, 8. Rack rear panel, 9. Unit compartment shelf, 10. Double-column shaft assembly, 10-1. Shaft column, 11. Rack bottom plate, 12. Insertion and extraction tool, 12-1. Handle end, 12-2. Insertion end, 13. Unlocking angle plate, 14. Spring, 15. Interlock plate, 16. Base plate, 17. Closing switch Interlocking hole guide, 18. Closing interlocking hole, 19. Angle plate shaft, 20. Positioning shaft, 21. Positioning piece, 22. Padlock fitting hole, 23. Padlock bracket, 24. Insulation spacer, 25. Flip row, 26. Inlet side isolation plate, 27. Roller, 28. Limit guide rail, 29. Hook plate, 30. Pad, 31. Operating stroke limit slot block, 32. Vertical busbar, 33. Outgoing static socket, 34. Functional unit removable assembly, 35. Closing interlocking rod, 36. Padlock, 37. Guide strip, 38. Switch opening and closing handle, 39. Travel switch. DETAILED DESCRIPTION

[0072] The current status of drawer-type functional units in the industry is that the main circuit plug and the vertical busbar 32 are flexibly connected, the circuit breaker is a fixed circuit breaker, the incoming line side of the circuit breaker 5 is connected to the terminal 3 of the main circuit plug to form a main circuit power connection, the outgoing line side of the circuit breaker 5 is connected to the terminal 3 of the main circuit plug, and a current transformer 7 is installed, and the main circuit plug on the outgoing line side is connected to the outgoing static socket 33. As seen in the current market, the arrangement of the main circuit plugs used in drawer-type units is basically a three-phase straight line arrangement of A, B, and C. The terminal 3 of the main circuit plug is inconsistent with the terminal face of the horizontally mounted circuit breaker. Therefore, the connection process must use a flip-up 25 to connect to the circuit breaker 5, which wastes copper. The conductive connector 6 is manufactured with a 1-to-1 process structure. If wire connection is used, the cost will be even higher. The process of installing the connector of the current transformer 7 on the outgoing line side is more complicated than that of the conductive connector 6 on the incoming line side. It also occupies a larger depth in the front and back of the unit. After assembly, the electrical clearance between the conductive connector 6 can only meet the insulation voltage of 690V. It needs to be isolated with a thermal bushing to achieve the insulation voltage of 1000V, which is labor-intensive and increases costs. Figure 8 The connection status of

[0073] This solution innovates a main circuit reversing plug and a main circuit connection structure for connecting a circuit breaker through the main circuit reversing plug. This simplifies the process and installation method, reduces the number of connection points, and connects the circuit breaker through the main circuit reversing plug to reduce the installation space between the front and back. The installation type satisfies the plug and the vertical busbar 32, which can solve the comprehensive problems and defects in the background technology, reduce costs, improve the versatility of parts, facilitate manufacturing and installation, and facilitate application and rapid maintenance. At the same time, it innovates a removable operating structure to achieve a simple and fast operating structure type, ensure reliable plug connection, and a functional unit structure with minimal operating displacement. The installation and connection process is simplified, improving the cost reduction and achieving the comprehensive technical requirements.

[0074] The main circuit body reversing plug is divided into a plug part located on the front of the plug mounting plane and a terminal reversing part located on the back of the plug mounting plane. The terminal reversing part is a horizontally extending structure connected to the plug part, which reverses the terminal 3 to the side of the plug end 2 of the plug part. The plug part and the terminal reversing part are insulated and isolated by an insulating shell 1, and the plug end 2 and the terminal 3 are exposed from the insulating shell 1.

[0075] The specific structure of the main circuit reversing plug is as follows: it includes an insulating shell 1 and a plug unit insulated and isolated by the insulating shell 1, the plug unit includes a main circuit plug and a terminal block, the plug end 2 is the front end of the main circuit plug, the connection terminal 3 is the rear end of the terminal block, the front end of the terminal block is connected to the rear end of the main circuit plug, and a transverse extension section is between the front and rear ends of the terminal block. The front and rear ends of the terminal block are distributed on the front and back sides of the transverse extension section and are in a vertical relationship. The insulating shell 1 includes a plug part and a transverse extension part. The main circuit plug is installed in the plug part of the insulating shell 1, constituting the plug part of the main circuit reversing plug, the transverse extension section of the terminal block is installed in the transverse extension part of the insulating shell 1 and the rear end of the terminal block is exposed from the transverse extension part of the insulating shell 1, constituting the connection terminal reversing part.

[0076] The main circuit reversing plug of the main circuit body is connected to the main circuit connection structure of the circuit breaker, including a circuit breaker 5 and a main circuit plug. The phases arranged from top to bottom on the incoming line side of the circuit breaker 5 are connected to the main circuit plugs of the corresponding phases through conductive connectors 6. The main circuit plugs of each phase on the incoming line side are arranged in layers from top to bottom, and the horizontal phase spacing of the plug ends 2 of the main circuit plugs of each phase is consistent with the phase spacing of the vertical busbar 32, which is used for direct plug connection with the vertical busbar 32. The main circuit plugs of all or some phases are the above-mentioned main circuit body reversing plugs.

[0077] The interphase centers of the main circuit plug and the interphase centers of the corresponding phases of the circuit breaker 5 are arranged correspondingly, so that the main circuit plug and the corresponding phases of the circuit breaker 5 can be connected one by one by arranging the conductive connectors 6 in layers from top to bottom.

[0078] In the specific implementation process of the main circuit connection structure of the main circuit body reversing plug connection circuit breaker, the design and manufacturing use plug module assembly. By meeting the principle of consistent connection between the phase centers of various types of circuit breakers, it can not only shorten the material length of the conductive connector 6, but also simplify the process of the conductive connector 6 and improve the isolation level of the phase center connection insulation voltage. The maximum technical goal is to reduce 50% of connecting parts, save 35% of copper, and reduce costs.

[0079] Figure 1 、 2 As shown in Figures 3 and 4, there are four types of plug modules: L1, L2, L3, and L4. The L1 plug module 4-1 is a conventional main circuit plug, and the L2, L3, and L4 plug modules 4-2, 4-3, and 4-4 are main circuit body reversing plugs. The only difference between the L2, L3, and L4 plug modules is that the reversing part of the connection terminal changes from short to long.

[0080] It is more reasonable to use L1 plug module 4-1 for phase A and phase B on the incoming line side, and L3 and L4 plug modules 4-3 and 4-4 for phase C and N. L1 plug module 4-1 is basically selected for the outgoing line side, and L2 plug module 4-2 can also be selected.

[0081] like Figure 5 As shown, the present invention is most commonly used in specific applications. On the incoming line side, phases A and B use L1 plug module 4-1, while phase C uses L3 plug module 4-3. The main circuit plug terminals 3 of phases A and C are arranged in a row from top to bottom. The main circuit plug terminals 3 of phase B are staggered with those of phases A and B. On the outgoing line side, all L1 plug modules 4-1 are used. The main circuit plugs on the incoming line are connected to vertical busbar 32, while the main circuit plugs on the outgoing line are connected to the outgoing static socket 33. Figure 9 for Figure 5 Schematic diagram of the structure of connecting the main circuit plug to the circuit breaker. Figure 11 For Figure 9 Schematic diagram of the structure in which a current transformer 7 and an insulating spacer 24 are additionally installed.

[0082] like Figure 6 As shown, in another specific application of the present invention, the A phase on the incoming line side uses the L1 plug module 4-1, the B phase and the C phase use the L2 and L3 plug modules 4-2 and 4-3, and the connection terminals 3 of the main circuit plugs of the A phase, B phase and C phase are arranged in a row from top to bottom. Figure 10 for Figure 6 Schematic diagram of the structure of connecting the main circuit plug to the circuit breaker.

[0083] like Figure 7 As shown, in another specific application of the present invention, the incoming line side has phase A, phase B, phase C and phase N arranged from top to bottom, and phase A, phase B, phase C and phase N respectively use L1, L2, L3, L4 plug modules 4-1, 4-2, 4-3, 4-4, and the connection terminals 3 of the main circuit plugs of each phase are arranged in a row from top to bottom. The inter-phase gap of the conductive connector 6 of each phase will be less than the insulation voltage standard requirement of 1000V. The insulation voltage of 1000V can be achieved by providing insulating spacers 24 between the conductive connectors 6.

[0084] In the specific implementation process, the four plug modules must be selected L3 plug module 4-3 installed close to the rear end plate 8 of the rack, which can shorten the conductive connector 615mm. The 6 main circuit plugs on the input and output sides can all be shortened by 15mm, saving copper. Compared with the existing straight-line main circuit plugs on the market, the phase center of the main circuit plug is designed to correspond to the phase center of the corresponding phase of the circuit breaker 5. The design of the main circuit body reversing plug can save the copper of 6 connectors in the 3-pole input and output lines. The application of 6 parts can be shortened by another 15mm, and the copper used in the conductive connector 6 is reduced by about 35% in total. Figure 5 The current status of the industry's main circuit plug and circuit breaker connection structure requires 12 conductive connectors 6, which wastes materials.

[0085] In the application, Figure 5 The selection of plug modules for main circuit plug installation and layout is the most practical. Figure 6 、 Figure 7 The installation arrangement structure cannot be excluded in the application.

[0086] The standard width of the functional unit cabinet for low-voltage complete sets of equipment is 600mm, and the width of the functional unit mounting frame is 505-510mm. The side-outlet structure functional unit mounting frame cannot be greater than 505mm wide. The functional unit uses a current of 630A, and the external volume of the circuit breaker is relatively large. The current transformer 7 must be arranged for the outgoing line, and the corresponding space must be provided for the outgoing line installation. Therefore, the circuit breaker 5 is arranged on the left side of the functional unit, and the incoming vertical bus 32B, C, and N phases are all behind the circuit breaker 5. The incoming line terminals of the circuit breaker 5 are all on the outside of the vertical bus 32. Therefore, by reversing the terminal 3 of the main circuit plug to the main circuit body reversing plug outside the incoming line terminal of the circuit breaker 5, the problem is solved, the process structure of the conductive connector 6 is optimized, and the modular structure of the main circuit plug is realized, which meets the manufacturer's requirement that the plug module be used in the corresponding plug module installation structure of the circuit breaker phase center. Of the four designed L1, L2, L3, and L4 plug modules 4-1, 4-2, 4-3, and 4-4, L1 plug module 4-1 is used for phase A. Terminal 3 does not require reversing and is installed outside the circuit breaker 5. While the main circuit plug for phase B is located behind the circuit breaker 5, its terminal 3 is very close to the circuit breaker 5 terminals. The terminal 3 of the main circuit plug for phase C is farther away from the circuit breaker 5 terminals. If L1 plug module 4-1 were used for phase C, the conductive connector 6 would need to be flipped 25 for connection, adding additional connecting components and complicating the connection process. Therefore, a reversing plug for the main circuit body of phase C is used to reverse the terminal 3, and with the insulating housing 1 for insulation, it can be installed snugly against the rear panel 8 of the rack. This creates interphase isolation between the main circuit body reversing plug for phase C and the standard main circuit plug for phase B, reducing copper length overall. Furthermore, the conductive connector 6 of phase B can be offset from the conductive connections of phases A and C, increasing the interphase electrical clearance. The interphase isolation of the connection terminals of the circuit breaker 5 is equipped with insulating isolators 24, and the interphase isolation of the guide connectors of each phase can achieve the high standard technical goal of connection with an insulation voltage of 1000V.

[0087] When the interphase center of the plug module is not consistent with the interphase center of the circuit breaker 5, the interphase center of the plug module can be adjusted in positive and negative dimensions. In addition, the conductor center hole of the terminal 3 of the plug module can be adjusted in positive and negative dimensions to ensure that the connection structure consistent with the interphase center of the circuit breaker 5 is fully realized.

[0088] In this solution, the interphase centers of the main circuit plug are arranged correspondingly to the interphase centers of the corresponding phases of the circuit breaker 5. The technical goal is to optimize the main circuit power connection process of the functional unit, reduce copper usage, increase the connection isolation distance, improve safety, simplify the manufacturing process, increase the commonality of the connector by more than 60%, and significantly reduce the workload of batch production design.

[0089] The design of the main circuit reversing plug and the main circuit connection structure connecting the main circuit reversing plug to the circuit breaker 5 in this solution significantly reduces costs, processes, design workload, and system costs in manufacturing applications, and has a highly economical impact on technological advancement in the low-voltage complete system industry. This connection structure connecting the main circuit reversing plug to the circuit breaker 5 in this solution has been a technological goal pursued by generations of technicians in this industry.

[0090] The innovation of this solution also includes the operating mechanism and position interlocking mechanism functions.

[0091] A removable functional unit assembly for low-voltage complete equipment utilizes the above-mentioned main circuit body reversing plug connection structure for the circuit breaker, comprising a circuit breaker 5 and a removable functional unit rack. The circuit breaker 5 is horizontally mounted on the removable functional unit rack, and a vertically arranged rack rear end plate 8 is provided at the rear end of the removable functional unit rack. The main circuit plug is mounted on the rack rear end plate 8, and the plug end of the main circuit plug is plugged into and connected to the vertical busbar. The connection end of the main circuit plug is connected to the circuit breaker 5. The plug-in connection relationship between the main circuit plug and the main circuit is connected or disconnected by horizontally moving the removable functional unit rack. The front portion of the removable functional unit rack has an upper operating port for an operating mechanism. The removable functional unit rack is operated using the principle of a lever and a plug-in tool 12 in conjunction with the lower operating port on the unit chamber layer plate 9. The front and rear sides of the upper operating port serve as lever force points a when moving the removable functional unit rack. The upper operating port is composed of a double-column shaft assembly 10, which includes two shaft columns 10-1 arranged in front and behind, which serve as the lever force point a of the plug-in and pull-out tool 12 respectively. The two shaft columns 10-1 are arranged horizontally and fixed to the rack base plate 11 of the functional unit movable rack through a bracket. The two shaft columns 10-1 are higher than the upper plane of the rack base plate 11.

[0092] A removable functional unit of a low-voltage complete switchgear cabinet includes a unit chamber and a removable functional unit assembly of the low-voltage complete equipment described above within the unit chamber. The unit chamber layer plate 9 includes a lower operating port. When a plug-in tool 12 is inserted into the upper and lower operating ports, the front and rear sides of the lower operating port serve as lever force points a for moving the removable functional unit rack. The upper operating port is formed by a double-column rotating shaft assembly 10. The double-column rotating shaft assembly 10 includes two front-to-rear rotating shaft columns 10-1, which serve as lever force points a for the plug-in tool 12. The two rotating shaft columns 10-1 are arranged horizontally and fixed to the rack base plate 11 of the removable functional unit rack via a bracket. The two rotating shaft columns 10-1 are higher than the upper plane of the rack base plate 11. The lower operating port is also formed by a double-column rotating shaft assembly 10. The double-column rotating shaft assembly 10 of the lower operating port is fixed to the lower portion of the unit chamber layer plate 9. The two rotating shaft columns 10-1 of the lower operating port are lower than the lower plane of the unit chamber layer plate 9.

[0093] The insertion tool 12 includes a handle end 12 - 1 and an insertion end 12 - 2 located in front of the handle end 12 - 1 , and the handle end 12 - 1 and the insertion end 12 - 2 are L-shaped.

[0094] like Figures 13-18 As shown, the front of the functional unit movable assembly is also equipped with a position interlocking mechanism, and the front of the unit room layer plate 9 has a position positioning member 21 used in conjunction with the position interlocking mechanism. The position interlocking mechanism includes an unlocking angle plate 13, a spring 14 and an interlocking plate 15. The unlocking angle plate 13 is rotatable around the angle plate axis 19. One end of the unlocking angle plate 13 is an unlocking end, and the other end is a positioning end. The positioning end has a positioning shaft 20. One side of the position positioning member 21 has positioning grooves arranged from front to back for two-position positioning or three-position positioning. The unlocking angle plate 1 Under the action of the spring 14, the positioning shaft 20 is rotated to fit into the positioning groove to achieve the positioning state. The unlocking end of the unlocking angle plate 13 is manually pushed to rotate the unlocking angle plate 13 in the opposite direction to disengage the positioning shaft 20 from the positioning groove to achieve the unlocking state. The interlocking plate 15 is connected to the unlocking angle plate 13. When the unlocking angle plate 13 rotates to the positioning state, the unlocking angle plate 13 drives the interlocking plate 15 to cover the upper operating port and lock the operating mechanism. When the unlocking angle plate 13 rotates to the unlocking state, the unlocking angle plate 13 drives the interlocking plate 15 to give up the upper operating port and unlock the operating mechanism.

[0095] The interlocking plate 15 is hinged on the positioning end of the unlocking angle plate 13. The unlocking angle plate 13 drives the interlocking plate 15 to block or give up the upper operating port by a horizontal movement. The unlocking end of the unlocking angle plate 13 is provided with a padlock fitting hole 22. A padlock bracket 23 is also provided at the front of the movable assembly of the functional unit. The padlock bracket 23 is provided with a padlock fitting hole 22. The padlock bracket 23 is located on the outer side of the unlocking end of the unlocking angle plate 13 and is used to unlock the lock by rotating the unlocking angle plate 13 to the position positioning state. The unlocking angle plate 13 is locked by padlocking. A closing interlock hole 18 is also provided on the front of the functional unit movable assembly. The interlocking plate 15 also has a closing interlock hole 18. When the unlocking angle plate 13 is reset to the positioned state, the closing interlock hole 18 of the functional unit movable assembly corresponds to the closing interlock hole 18 of the interlocking plate 15. When the unlocking angle plate 13 is rotated to the unlocked state, the closing interlock hole 18 of the functional unit movable assembly is staggered with the closing interlock hole 18 of the interlocking plate 15. The unit room layer plate 9 also has a closing interlock hole 18 that cooperates with the closing interlock hole 18 of the unit movable assembly. There are two closing interlock holes 18 on the unit room layer plate 9, namely a connection position closing interlock hole and a test position closing interlock hole.

[0096] The position interlocking mechanism is mounted on the frame bottom plate 11 through a base plate 16. A closing interlocking hole guide 17 is provided on the closing interlocking hole 18 of the unit movable assembly. The interlocking plate 15 passes through the closing interlocking hole guide 17 and is guided laterally by the closing interlocking hole guide 17. Of course, the interlocking plate 15 can also be guided by other guides provided on the frame bottom plate 11 of the unit movable assembly.

[0097] like Figure 18 As shown, the operating mechanism is specifically installed in the middle right part of the front section of the functional unit movable assembly 34, and the position interlocking mechanism is arranged in the middle left part. The interlocking plate 15 of the position interlocking mechanism locks the upper operating port of the operating mechanism. Only by unlocking the position interlocking mechanism can the upper operating port of the operating mechanism be opened, and the operating tool is inserted to operate the functional unit movable assembly 34 to move in and out of the unit room.

[0098] like Figure 19 As shown, the front end of the shelf of the unit room is correspondingly arranged with a double-column rotating shaft assembly 10 and a positioning member 21 constituting the lower operating port. There are two types of positioning members 21: the first type is a two-position positioning member for positioning in two positions of testing and connection, and the second type is a three-position positioning member for positioning in three positions of separation, testing, and connection.

[0099] like Figures 20-22As shown, when the functional unit movable assembly 34 moves to the separation position, the main circuit power is disconnected; when the functional unit movable assembly 34 moves to the test position, the main circuit power is disconnected, the auxiliary power is connected, and the limit switch 39 connects the position power; when the functional unit movable assembly 34 moves to the connection position, the main circuit power is connected, the auxiliary power is connected, and the limit switch 39 disconnects the position power. Alternatively, the limit switch 39 can be arranged to connect the position power. When the functional unit movable assembly 34 moves to the third position, the upper operating port of the operating mechanism is locked.

[0100] Operation procedure: Starting from the separation position, manually unlock the unlocking end of the unlocking angle plate 13 to unlock the position interlocking mechanism, manually push the functional unit movable assembly 34 to the test position, and then manually unlock the unlocking end of the unlocking angle plate 13. The unlocking angle plate 13 drives the interlocking plate 15 to release the upper operating port through the plug-in and pull-out action. Insert the operating tool and pull it upward to the limit to make the functional unit movable assembly 34 enter the connection position.

[0101] When the operating mechanism uses the lever principle to move in and out through the plug-in tool 12, the lever force point a is converted to each other. Figures 23-27 .

[0102] like Figures 23-25 As shown, the removable functional unit operates in three positions: With the unit door open, operate the removable functional unit assembly 34 by first gently pushing it to the disengaged position and positioning it. Then, manually push the unlocking end of the unlocking angle plate 13 and apply slight force to push it to the test position and positioning it. At this point, the auxiliary power is connected and the main circuit power is disconnected. Then, manually push the unlocking end of the unlocking angle plate 13 to unlock the upper operating port. Insert an operating tool and pull it upward to the limit to move the removable functional unit assembly 34 to the connected position. Remove the operating tool, close the unit door, and close the circuit breaker 5.

[0103] like Figures 26-27 As shown, the operation method of the three exit positions of the removable functional unit is: the circuit breaker 5 is opened, the unit door is opened, the unlocking end of the unlocking angle plate 13 is manually unlocked to unlock the upper operating port, the operating tool is inserted, and the unlocking angle plate 13 is pulled down to the test position, and the operating tool is pulled out, the unlocking angle plate 13 and the interlocking plate 15 are reset, and the position of the functional unit movable assembly 34 is positioned, the unlocking end of the unlocking angle plate 13 is manually unlocked to position and the functional unit movable assembly 34 is manually pulled to the separation position or the functional unit movable assembly 34 is directly moved out of the unit room.

[0104] The protection operation functions of this scheme are arranged as follows:

[0105] Figure 28 The unlocking angle plate 13 of the position interlocking mechanism is locked with the padlock 36 when in the separated position.

[0106] Figure 29When in the test position, the unlocking angle plate 13 of the position interlocking mechanism is locked with the padlock 36.

[0107] Figure 18 The incoming side of the circuit breaker 5 is equipped with an incoming side isolation plate 26 to form a charged body isolation zone to prevent the human body from accidentally touching the incoming line connection state conductor during operation or non-professionals from entering during maintenance and causing personal injury accidents.

[0108] Figure 30 This removable functional unit has a switch closing interlock function. When the switch is closed, the closing interlock rod 35 passes through the closing interlock hole guide 17 and the closing interlock hole 18. The functional unit removable assembly 34 is blocked by the closing interlock rod 35 and cannot enter the unit room, preventing misoperation.

[0109] Figure 31 The switch is in the open state, and the switch opening and closing handle 38 can be locked with a padlock 36, so the switch cannot be closed.

[0110] Figure 19 and 32 The functional unit removable assembly 34 and the unit compartment's operating limit structure are arranged. The functional unit removable assembly 34 is equipped with rollers 27, limit guide rails 28, hook plates 29, pads 30, and guide bars 37. The unit compartment is equipped with corresponding limit guide rails 28, hook plates 29, and operating travel limit slots 31 that cooperate with guide bars 37, corresponding to the functional unit removable assembly 34. This coordinated interaction ensures that the functional unit's high-current operating displacement complies with applicable operating standards, ensuring a high reliability technical target of ±1.0mm for both incoming and outgoing plug connection depths.

[0111] Figure 33 It is the layout of incoming busbar and outgoing line in the unit room.

[0112] Figure 34 Whole cabinet pattern.

[0113] This solution saves materials and labor, greatly improves the degree of process and achieves the high standard technical goal of 1000V insulation voltage between the plug and the circuit breaker 5. It is highly practical and has considerable economic value in industrial applications.

[0114] This solution can be widely used in low-voltage power distribution systems and motor protection control systems. The main circuit connection structure of the main circuit body reversing plug connected to the circuit breaker is an innovative concept with high practicality. The position interlocking mechanism of the door-opening functional unit provides great convenience for user maintenance.

[0115] The operating mechanism is quick to connect and exit, and has a novel structural design concept.

[0116] Operational safety: The live body isolation zone structural concept ensures the operator's safety.

[0117] The four plug modules used in the specific implementation have power ratings of 125A, 250A, 400A, and 630A, meeting the requirements for 3-pole and 4-pole installation applications. The operating force of the operating mechanism meets the requirements of the functional unit and the plug module is 2000N.

[0118] The plug module has an insulation voltage of 1000V and a rated working voltage of 690V.

[0119] The plug module installation connection structure has a phase-to-phase insulation voltage of 1000V.

[0120] The removable three-position operation functional unit system technology of this solution can be widely used in low-voltage complete equipment (power distribution and control circuits) and separated functional units. One device can be equipped with 9 units, or it can meet the needs of 9 units and 18 circuits.

Claims

1. A main circuit connection structure for connecting a main circuit body reversing plug to a circuit breaker, comprising a circuit breaker and a main circuit plug, wherein each phase arranged from top to bottom on the incoming line side of the circuit breaker is connected to the main circuit plug of the corresponding phase via a conductive connector, characterized in that: The main circuit plugs of each phase on the incoming line side are arranged in layers from top to bottom, and the horizontal phase spacing of the plug ends of the main circuit plugs of each phase is consistent with the phase spacing of the vertical busbar, and are used for direct plug-in connection with the vertical busbar. The main circuit plug of all or part of the phases is the main circuit body reversing plug; The main circuit reversing plug is divided into a plug portion located on the front of the plug mounting plane and a terminal reversing portion located on the back of the plug mounting plane. The terminal reversing portion has a terminal. The terminal reversing portion is a transversely extending structure connected to the plug portion, which reversals the terminal to one side of the plug end of the plug portion. The plug portion and the terminal reversing portion are insulated and isolated by an insulating shell, and the plug end and the terminal are exposed from the insulating shell. The circuit breaker has phases A, B, and C arranged from top to bottom on the incoming line side, wherein only the main circuit plug of phase C is a main circuit body reversing plug, and the connection terminals of the main circuit plugs of phases A and C are arranged in a row from top to bottom; or, in addition to the main circuit plug of phase A, the main circuit plugs of phases B and C are main circuit body reversing plugs, and the connection terminals of the main circuit plugs of phases A, B, and C are arranged in a row from top to bottom; Alternatively, the A phase, B phase, C phase and N phase are arranged from top to bottom on the incoming line side of the circuit breaker. Except for the main circuit plug of phase A, the main circuit plugs of phases B, C and N are main circuit body reversing plugs, and the connection terminals of the main circuit plugs of each phase are arranged in a row from top to bottom; The interphase centers of the main circuit plug are arranged correspondingly to the interphase centers of the corresponding phases of the circuit breaker, so that the main circuit plug and the corresponding phases of the circuit breaker can be connected one by one by arranging the conductive connectors in layers from top to bottom.

2. The main circuit connection structure of the main circuit body reversing plug connected to the circuit breaker according to claim 1 is characterized by: The main circuit reversing plug includes an insulating shell and a plug unit insulated and isolated by the insulating shell. The plug unit includes a main circuit plug part and a terminal block. The plug end is the front end of the main circuit plug part, and the connection end is the rear end of the terminal block. The front end of the terminal block is connected to the rear end of the main circuit plug part. There is a horizontal extension section between the front and rear ends of the terminal block. The front and rear ends of the terminal block are respectively located on the front and rear sides of the horizontal extension section and are perpendicular to the horizontal extension section. The insulating shell includes a plug shell portion and a transverse extension portion. The main circuit plug portion is installed in the plug shell portion of the insulating shell, constituting the plug portion of the main circuit body reversing plug. The transverse extension section of the terminal block is mounted on the transverse extension portion of the insulating shell and the rear end of the terminal block is exposed from the transverse extension portion of the insulating shell to form a terminal reversing portion.

3. A removable assembly of functional units of a low-voltage complete set of equipment, characterized by: The main circuit connection structure of the main circuit body reversing plug connected to the circuit breaker according to claim 1 comprises a circuit breaker and a movable functional unit rack, wherein the circuit breaker is horizontally mounted on the movable functional unit rack. A vertically arranged rack rear panel is provided at the rear end of the movable rack of the functional unit. The main circuit plug is installed on the rack rear panel. The plug end of the main circuit plug is plugged into the vertical busbar, and the connection end of the main circuit plug is connected to the circuit breaker. The functional unit movable rack is connected or disconnected from the plug-in connection relationship between the main circuit plug and the main circuit by horizontally moving the functional unit movable rack.

4. The removable functional unit assembly of the low-voltage complete equipment according to claim 3 is characterized by: The front of the functional unit movable rack has an upper operating port of the operating mechanism. The functional unit movable rack is operated by using the lever principle and the plug-in tool and the lower operating port on the unit room layer plate. The front and rear sides of the upper operating port serve as the lever force points a when moving the functional unit movable rack.

5. The removable functional unit assembly of the low-voltage complete equipment according to claim 4 is characterized by: The upper operating port is composed of a double-column shaft assembly, which includes two shaft columns arranged in front and behind, respectively serving as the lever force point a of the plug-in and pull-out tools. The two plug-in and pull-out columns are arranged horizontally and fixed to the rack base plate of the functional unit removable rack through a bracket. The two plug-in and pull-out columns are higher than the upper plane of the rack base plate.

6. A removable functional unit of a low-voltage complete switchgear cabinet, characterized by: A removable assembly of a functional unit of a low-voltage complete set of equipment as described in claim 3 including a unit room and the unit room, wherein the unit room layer plate has a lower operating port. When the upper operating port and the lower operating port are inserted through a plug-in tool, the front and rear sides of the lower operating port respectively serve as lever force points a when moving the removable rack of the functional unit.

7. The removable functional unit of the low-voltage complete switchgear according to claim 6 is characterized in that: The upper operation port is composed of a double-column shaft assembly, which includes two shaft columns arranged in front and behind, respectively serving as the lever force point a of the plug-in and pull-out tools. The two plug-in columns are arranged horizontally and fixed to the rack bottom plate of the functional unit removable rack through a bracket. The two plug-in columns are higher than the upper plane of the rack bottom plate. The lower operating port is also composed of a double-column rotating shaft assembly, which is fixed to the lower part of the unit room layer plate, and the two rotating shaft columns of the lower operating port are lower than the lower plane of the unit room layer plate.

8. The removable functional unit of the low-voltage complete switchgear according to claim 6 is characterized by: The front of the functional unit movable assembly is also equipped with a position interlocking mechanism, and the front of the unit room layer plate has a position positioning member that cooperates with the position interlocking mechanism. The position interlocking mechanism includes an unlocking angle plate, a spring and an interlocking plate. The unlocking angle plate can be rotatably arranged. One end of the unlocking angle plate is an unlocking end, and the other end is a positioning end. The positioning end is provided with a positioning shaft. One side of the position positioning member has positioning grooves arranged from front to back for two-position positioning or three-position positioning. The unlocking angle plate rotates under the action of the spring to embed the positioning shaft into the positioning groove to achieve position positioning. The unlocking end of the unlocking angle plate is manually pushed to rotate the unlocking angle plate in the opposite direction to disengage the positioning shaft from the positioning groove to achieve position unlocking. The interlocking plate is connected to the unlocking angle plate. When the unlocking angle plate rotates to the positioning state, the unlocking angle plate drives the interlocking plate to cover the upper operating port and lock the operating mechanism. When the unlocking angle plate rotates to the unlocking state, the unlocking angle plate drives the interlocking plate to give up the upper operating port and unlock the operating mechanism.

9. The removable functional unit of the low-voltage complete switchgear according to claim 8 is characterized by: The interlocking plate is hinged on the positioning end of the unlocking angle plate. The unlocking angle plate drives the interlocking plate to block or release the upper operating port by a horizontal movement. The unlocking end of the unlocking angle plate is provided with a padlock matching piece hole. A padlock bracket is also provided at the front of the movable assembly of the functional unit. The padlock bracket is provided with a padlock matching piece hole. The padlock bracket is located on the outer side of the unlocking end of the unlocking angle plate and is used to lock the unlocking angle plate by padlocking when the unlocking angle plate is rotated to the position positioning state. There is also a closing interlocking hole on the front of the functional unit removable assembly, and the interlocking plate also has a closing interlocking hole. When the unlocking angle plate is reset to the position positioning state, the closing interlocking hole of the functional unit removable assembly corresponds to the closing interlocking hole of the interlocking plate. When the unlocking angle plate is rotated to the position unlocking state, the closing interlocking hole of the functional unit removable assembly and the closing interlocking hole of the interlocking plate are staggered.

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