An interlocking mechanism for a movable drawer unit and the movable drawer unit.

Abstract

This utility model relates to the field of low-voltage switchgear technology, specifically an interlocking mechanism for a movable drawer unit and the movable drawer unit itself. The interlocking mechanism includes a position interlocking mechanism, comprising a position interlocking drive plate and a movable portion position locking plate. The movable portion position locking plate is located on the back of the movable drawer unit and is fixed to the movable portion. The position interlocking drive plate is positioned by embedding a positioning element into a corresponding position positioning hole on the movable portion position locking plate. The fixed and movable portions of the movable drawer unit are interlocked through the aforementioned interlocking mechanism. The advantages are: the interlocking mechanism has complete functions, low structural cost, small space occupation, and enables unit miniaturization; the use of T-shaped sliding columns and guide rails for push-guided limiting reduces the precision requirements of sheet metal parts processing, lowers costs, solves push-up failures, controls the upward tilting of the rear of the movable portion, and also increases the internal width of the unit.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage switchgear technology, and in particular to an interlocking mechanism for a movable drawer unit and the movable drawer unit itself. Background Technology

[0002] MS, GCS, and GCK drawer units (hereinafter collectively referred to as economic drawer units) are the mainstream terminal power supply equipment in low-voltage switchgear. When the economic drawer unit is in three-position operation, the entire drawer unit moves within the unit compartment in three positions. When the drawer unit is in the separated or test position, there is a certain gap between the unit door and the cabinet. Only when the drawer unit is in the connected position is the unit door tightly against the cabinet, and only then can the unit's operational protection rating reach IP40. The position interlocking mechanism of the economic drawer unit works in conjunction with the position positioning components within the unit compartment to position the drawer unit.

[0003] The difference between a movable drawer unit and an economy drawer unit lies in the fact that a movable drawer unit consists of two parts: a fixed part and a movable part, as seen in the applicant's Chinese patent applications 200410064770.9 and 200920037161.2. The fixed part includes a lead screw and a position interlocking mechanism, a position display mechanism, a closing interlocking mechanism, and a unit locking mechanism. The movable part is equipped with a nut that mates with the lead screw. The fixed and movable parts are connected together and can move back and forth. The lead screw on the fixed part, in conjunction with the nut, pushes the movable part to move back and forth relative to the fixed part. The position interlocking mechanism locks the lead screw by inserting the head end of a position locking plate into the splined bushing of the lead screw.

[0004] However, existing movable drawer units have the following technical drawbacks:

[0005] 1. The position interlocking mechanism has a complex structure, and the position interlocking mechanism and its supporting position display mechanism and closing interlocking mechanism occupy a large space on the left side of the interlocking mechanism space of the fixed part's push screw, making it impossible to achieve a cabinet width of 500m.

[0006] The reason is that the position interlocking mechanism uses a slotted engagement between a position locking plate and a position locking rod for position locking. The position locking plate is located on the left side of the lead screw, and its head is inserted into the splined bushing of the lead screw to lock it. The position display mechanism works in conjunction with the position locking rod to display the position, and is located in front of the position locking rod. All of these factors contribute to the complexity of the position interlocking mechanism's structure.

[0007] Additionally, the position locking rod connected to the movable part is located on the left side of the push screw, which is positioned in the middle of the fixed part and its position cannot be changed. This divides the space of the fixed part into a left-side space and a right-side space. The separation position positioning slot on the position locking rod is located at the rear relative to other position positioning slots, so the position locking plate can only be located at the rear of the fixed part. Simultaneously, the position display mechanism works in conjunction with the head of the position locking rod via a position display arc-shaped component. The position display is indicated by the forward and backward movement of the position locking rod. Since the position locking rod is on the left side of the push screw, the position display arc-shaped component can only be on the left side of the push screw. The right side of the position display arc-shaped component also has a mechanism for interlocking with the closing mechanism. The locking hole for the closing interlocking rod, and the fact that the closing interlocking rod needs to be set a certain distance to the left of the push screw, all contribute to the large space occupied by the position interlocking mechanism and its associated position display mechanism, closing interlocking mechanism on the left side of the fixed part's push screw. The space occupied on the left side of the fixed part is about 40mm. In addition, a unit locking mechanism also needs to be set in the space on the left side of the fixed part. The minimum internal width of the unit for a cabinet width of 600mm is 505mm. The position interlocking mechanism, position display mechanism, closing interlocking mechanism and unit locking mechanism have already filled the space on the left side of the fixed part. The internal width of the unit for a cabinet width of 500mm is only 414mm. Therefore, only a cabinet width of 600mm can be achieved, and a cabinet width of 500mm cannot be achieved.

[0008] 2. The position interlocking mechanism locks the lead screw by inserting the head end of the position locking plate into the splined bushing. Because the splined groove of the splined bushing is V-shaped, there is always a large clearance when the head end of the position locking plate is inserted into the splined bushing. Moreover, splined bushings are usually made of powder metallurgy material, which has high hardness but low structural strength. In case of misoperation, if the impact is too strong, there are cases where the splined bushing will burst. In this case, the hand-cranked drive mechanism must be replaced. Due to the complexity of the structure, the on-site operator cannot replace it and it must be returned to the factory for repair.

[0009] 3. The closing interlocking mechanism that is matched with the position interlocking mechanism occupies a large amount of unit height, and the minimum unit height can only be 200mm.

[0010] The reason is that the position interlocking mechanism occupies 30mm of the unit chamber height, and the closing interlocking mechanism is fixed on the upper surface of the fixed part of the unit by 30mm, with a minimum height of 82mm, which cannot be reduced. Since the opening and closing stroke of the crank arm of the closing interlocking mechanism also occupies the height, the unit height of 200mm cannot be changed, and the unit height of 150mm cannot be achieved.

[0011] 4. The movable drawer unit has a push-in failure, and the push-in screw and nut have a short mechanical life.

[0012] The reason is as follows: The fixed part of the movable drawer unit has outer beams on both sides, which are L-shaped and have grooves. The movable part has a screw plate and an L-shaped inner beam. The movable part is slidably connected to the outer beam via a sliding post on the inner beam and a groove on the outer beam. The movable part is manually propelled by a push screw and screw nut installed on both the fixed and movable parts. The movable drawer unit is guided and limited by rollers or steel shafts on the side of the outer beam of the fixed part and guide rails on both sides of the unit compartment.

[0013] The clearance between the lead screw and the nut is only 0.3mm, and there is also a corresponding clearance between the sliding column of the movable part and the outer beam of the fixed part. Theoretically, the vertical clearance between the two can be designed to be 0.3mm. However, in actual production, it is difficult to achieve the front and rear flatness of the outer beam due to sheet metal bending. Even with special mold processing, the vertical clearance between the sliding column of the movable part and the groove of the outer beam is often greater than 0.5mm. When the lead screw is manually cranked to push the movable part to the connection position, the insertion resistance caused by the main circuit connector is generated. In particular, the insertion pressure of the 630A main circuit connector is 1500N~1800N. The insertion resistance is generated instantaneously, causing the rear of the movable part to tilt upward by more than 0.5mm. This causes the clearance between the rollers on both sides of the unit and the guide rail to disappear, resulting in compression. The clearance between the lead screw and the nut is only 0.3mm, but the overall upward tilt of the rear of the movable part is greater than 0.3mm. This will cause the lead screw and nut to be damaged due to compression, resulting in a mechanical life of less than 500 cycles, which is not up to standard.

[0014] 5. The maximum internal width of a 500mm cabinet unit is only 414mm. If the movable drawer unit is still pushed and guided by the rollers or steel shafts on the side of the outer beam of the fixed part and the guide rails on both sides of the unit, the internal width of the unit will be even smaller, and it will be impossible to achieve an internal width of 414mm. If the internal width of the unit is less than 414mm, the feasibility of arranging the main and auxiliary circuit connectors at the rear of the movable part cannot be met.

[0015] 6. The structural cost of movable drawer units is higher than that of economy drawer units.

[0016] Because of the aforementioned technical defects in existing movable drawer units, their market application is very small.

[0017] However, the movable drawer unit's door closing operation ensures that the unit door remains firmly against the cabinet regardless of whether the unit is in a separated, testing, or connected position, resulting in high safety during unit operation and maintenance. Users highly appreciate this feature, especially in special scenarios such as marine applications and offshore platforms. For data center scenarios with a large number of electrical devices, users also greatly appreciate the movable drawer unit.

[0018] If the structure can be optimized and costs reduced while maintaining high safety, there will be considerable demand from users in specific locations, as long as costs decrease.

[0019] In 2022, the applicant launched an economical drawer unit for power distribution circuits, achieving a cabinet width of 500mm and current ratings exceeding 630A and 400A, with a unit depth of 400mm. In 2023, it further miniaturized the unit, achieving a unit depth of 350mm, a cabinet width of 500mm, and a cabinet depth of 800mm.

[0020] Miniaturization of units and switchgear equipment can reduce the footprint of switchgear equipment, building upon the successful achievement of an economical drawer unit with a cabinet width of 500mm. If a movable drawer unit can achieve a cabinet width of 500mm and a unit height of 150mm, its application prospects will be even broader. Furthermore, the movable drawer unit allows for three-position advancement via its movable section, with the three-position travel occurring within the unit itself; therefore, the unit depth of the movable drawer unit is greater than that of the economical drawer unit. Utility Model Content

[0021] The technical problem to be solved by this utility model is that the existing interlocking mechanism has a complex structure, requires a large space, is not conducive to the miniaturization of the unit, and cannot achieve a cabinet width of 500mm.

[0022] The technical solution adopted by this utility model to solve its technical problem is: an interlocking mechanism for a movable drawer unit, including a position interlocking mechanism, the position interlocking mechanism comprising:

[0023] The position interlock drive plate is oscillatingly mounted on the fixed part of the movable drawer unit and oscillates to one side under the action of the elastic element.

[0024] The movable part position locking plate is used to cooperate with the position interlock drive plate for position positioning. The movable part position locking plate is located on the back of the movable drawer unit. The movable part position locking plate is fixed to the movable part and is used to make the movable part position locking plate move back and forth with the movable part. The movable part position locking plate has a positioning guide surface with position positioning holes arranged in the front and back.

[0025] The position interlock drive plate has a positioning element that extends to the back of the fixed part and cooperates with the positioning guide surface. The position interlock drive plate swings to one side under the action of the elastic element to make the positioning element fit the positioning guide surface, and when the movable part moves back and forth into the corresponding position, it is embedded in the corresponding position positioning hole to position the movable part.

[0026] In some embodiments, optionally, the movable portion position locking plate is connected to the fixed portion via a translational connection structure that allows for forward and backward translation.

[0027] In some embodiments, the optional translational connection structure is a groove-type connection structure, which specifically includes a groove and a groove screw that passes through the groove for connection and installation.

[0028] In some embodiments, optionally, the positioning guide surface is located inside the movable portion position locking plate, the movable portion position locking plate has a position locking clearance groove, and the positioning guide surface is one side of the position locking clearance groove.

[0029] In some embodiments, optionally, the interlocking mechanism of the movable drawer unit further includes a position display mechanism. The position display mechanism is installed on the fixed part of the movable drawer unit. The position display mechanism has a position display drive plate, which is pivotally mounted on the fixed part of the movable drawer unit. The movable part position locking plate has a display guide groove, and the position display drive plate has a display drive member that cooperates with the display guide groove. The display drive member extends to the back of the fixed part and is embedded in the display guide groove. During the process of the movable part moving back and forth into the corresponding position, the display guide groove drives the position display drive plate to swing through the display drive member. The swing of the position display drive plate drives the position display plate of the position display mechanism to move, thereby displaying the position.

[0030] In some embodiments, optionally, the position interlocking mechanism further includes a push screw position locking plate driven by a position interlocking drive plate. The head end of the push screw position locking plate is inserted into a position locking slot on the side of the front end of the push screw to lock the position of the push screw. The push screw position locking plate and the position interlocking drive plate are mounted on a mounting base plate and are mounted on the fixed part of the movable drawer unit via the mounting base plate. The front part of the mounting base plate has a locking plate fixing bracket protruding from the mounting base plate. The push screw position locking plate is laterally movable on the locking plate fixing bracket via a lateral connection structure. The locking plate fixing bracket and the push screw position... The upper end of each locking plate has a closing interlock slot for cooperating with the closing interlock mechanism for closing interlocking. When the push screw position locking plate locks the push screw, the closing interlock slot on the locking plate fixing bracket and the push screw position locking plate coincides. The interlock mechanism also includes a closing interlock mechanism, which is installed on the fixed part of the movable drawer unit. The closing interlock mechanism has a closing interlock locking plate that moves up and down under the drive of the opening and closing shaft. The closing interlock locking plate locks the position interlock mechanism and the push screw by embedding into the closing interlock slot on the locking plate fixing bracket and the push screw position locking plate.

[0031] A movable drawer unit includes a fixed part and a movable part, which are interlocked by the interlocking mechanism of the movable drawer unit.

[0032] In some embodiments, optionally, a translatable connection structure is provided between the fixed part and the movable part for translatably connecting the fixed part and the movable part together, and the bottom of the movable part has a T-shaped sliding column for engaging with the guide rail in the unit chamber for propulsion guidance and limiting.

[0033] In some embodiments, optionally, a slidable connection structure between the fixed portion and the movable portion is located on the left and right sides of the movable drawer unit.

[0034] In some embodiments, optionally, the fixed part includes a push interlock base plate and slide brackets on both sides of the push interlock base plate. The push interlock base plate is used for mounting the push screw and the position interlock mechanism. The slide brackets on both sides also extend to both sides of the movable part. The slidable connection structure between the fixed part and the movable part is located on the slide bracket and the movable part, respectively. The slidable connection structure between the fixed part and the movable part is specifically a slide-type connection structure. The slide-type connection structure specifically includes a slide and a slide screw that passes through the slide for connection and installation. The slide is located on the side of the slide bracket. The slide screw passes through the slide to connect the slide bracket and the movable part together in a slidable manner.

[0035] Alternatively, the slide is located on the side of the movable part, and the slide screw passes through the slide to connect the slide bracket and the movable part together in a way that allows them to slide back and forth.

[0036] In some embodiments, optionally, the lead screw is mounted on the lead screw interlocking base plate via a lead screw mounting seat. The movable part has a nut that cooperates with the lead screw to push the movable part to move back and forth. The nut is mounted on the movable part via a nut mounting seat. The lead screw mounting seat and the nut mounting seat have a balance pressure plate for guiding and limiting the lead screw. One end of the balance pressure plate is fixedly connected to the nut mounting seat, and the other end of the balance pressure plate is movably connected to the lead screw mounting seat via a movable connection structure. Specifically, the movable connection structure between the balance pressure plate and the lead screw mounting seat is a groove-type connection structure.

[0037] Alternatively, one end of the balance plate is fixedly connected to the lead screw mounting base, and the other end of the balance plate is connected to the lead screw mounting base in a way that allows for forward and backward translation through a translational connection structure. Specifically, the translational connection structure between the balance plate and the lead screw mounting base is a sliding groove connection structure.

[0038] In some embodiments, optionally, a position display mechanism and a unit locking mechanism are also installed on the propulsion interlocking base plate, and an upper cover plate is installed on the propulsion interlocking base plate, covering the position interlocking mechanism, the position display mechanism and the unit locking mechanism, and a closing interlocking mechanism is installed on the upper cover plate.

[0039] In some embodiments, optionally, the movable part includes a base plate, which is divided into front and rear parts, namely a front threaded nut plate and a rear base plate. The threaded nut plate is used for mounting the threaded nut, and the movable part is connected to the fixed part in a way that allows it to slide back and forth through the threaded nut plate.

[0040] The beneficial effects of this utility model are: the design of setting the movable part position locking plate on the back of the unit reduces the external size of the position interlocking mechanism and the space occupied on the left side of the fixed part. In addition, the position display mechanism and the closing interlocking mechanism that cooperate with it also occupy less space, so that a cabinet width of 500mm can be achieved. Correspondingly, a cabinet width of 600mm can also be achieved simultaneously. The minimum unit height can be 150mm. The movable drawer unit with a cabinet width of 500mm can save copper on the horizontal busbar of the cabinet. For example, the horizontal busbar 2500A saves 5.22kg of copper.

[0041] The movable part's position locking plate is connected to the bottom surface of the fixed part through a sliding groove connection structure, which further balances the movable part and the fixed part, and ensures that the position interlocking mechanism and position display mechanism move flexibly and without jamming during the three-position movement of the movable part.

[0042] The interlocking mechanism of this utility model has complete functions, and its structure is simplified and its cost is reduced.

[0043] In the prior art, the unit's advancement guidance and limitation are jointly achieved by the guide rail and rollers, as well as the sliding column of the movable part and the sliding groove on the outer beam of the fixed part. However, this utility model adopts the T-shaped sliding column of the movable part and the guide rail of the unit chamber to cooperate for advancement guidance and limitation. The unit advances in a balanced manner in all directions, and the structure without squeezing effectively controls the failure of unit advancement.

[0044] In addition, the fit clearance between the movable connection structure between the fixed part and the movable part is no longer related to the push limit, no longer subject to force, and no longer requires control of the fit clearance, which simplifies the unit structure, reduces the processing accuracy requirements of sheet metal parts, reduces costs, and reduces the amount of steel plate used.

[0045] Meanwhile, this utility model adopts a T-shaped sliding column of movable part to cooperate with the guide rail of unit chamber for pushing, guiding and limiting, which can expand the inner width of the unit, so that the inner width of movable drawer unit with cabinet width of 500mm can reach a maximum of 414mm.

[0046] The movable drawer unit structure of this utility model allows the supplier to provide only the fixed part and the mother plate of the unit assembly, without having to provide the movable rear part, thus reducing procurement costs, transportation and packaging costs.

[0047] Combining the above advantages, the movable drawer unit of this utility model can achieve a cabinet width of 500mm, the unit advancement failure rate will be basically eliminated, and the overall application cost is similar to the total cost of the economical drawer unit currently used in the market, which is at least 20% lower than the application cost of existing movable drawer units. Attached Figure Description

[0048] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0049] Figure 1 A first-person perspective 3D view of the position interlocking mechanism;

[0050] Figure 2 A second-view perspective perspective view of the position interlocking mechanism;

[0051] Figure 3 This is a third-person perspective view of the position interlocking mechanism;

[0052] Figure 4 This is a front view of the interlocking mechanism in the interlocked state when it is in the separated position.

[0053] Figure 5 This is a rear view showing the interlocking mechanism in the interlocked state when in the separated position;

[0054] Figure 6 This is a side view of the interlocking mechanism in the interlocked state when it is in the separated position.

[0055] Figure 7 A perspective view of the interlocking mechanism in the interlocked state when in the separated position;

[0056] Figure 8 This is a front view of the interlocking mechanism in the unlocked state when it is in the separated position.

[0057] Figure 9 This is a rear view showing the interlocking mechanism in the unlocked state in the separated position.

[0058] Figure 10 This is a schematic diagram of the back of the interlocking mechanism in the interlocked state at the test position.

[0059] Figure 11 This is a side view of the interlocking mechanism in the interlocked state at the test position.

[0060] Figure 12 This is a rear view showing the interlocking mechanism in the interlocked state at the connection position;

[0061] Figure 13 This is a side view of the interlocking mechanism in the interlocked state at the connection position;

[0062] Figure 14This is a structural diagram of the fixed part;

[0063] Figure 15 A schematic diagram of the structure of the wire mother plate for the fixed part and the movable part;

[0064] Figure 16 In order to be in Figure 15 A structural diagram showing the addition of a nut mounting base and a balance pressure plate to the existing structure;

[0065] Figure 17 In order to be in Figure 16 A structural diagram showing the addition of a cover plate and a limit switch to the existing structure.

[0066] Figure 18 In order to be in Figure 17 A structural diagram showing the addition of a rear base plate to the existing structure;

[0067] Figure 19 A front-view structural diagram showing the closing coupling mechanism and the position interlocking mechanism in the unlocked state.

[0068] Figure 20 A rear-view structural diagram showing the closing coupling mechanism and the position interlocking mechanism in the unlocked state.

[0069] Figure 21 A front-view structural diagram showing the closing coupling mechanism and the position interlocking mechanism in an interlocked state.

[0070] Figure 22 A rear-view structural diagram showing the closing coupling mechanism and the position interlocking mechanism in an interlocked state;

[0071] Figure 23 A schematic diagram of the unit's open door configuration;

[0072] Figure 24 This is a schematic diagram of the unit room in the closed state.

[0073] Figure 25 This is a schematic diagram of the overall structure of the movable drawer unit;

[0074] Figure 26 This is a three-dimensional view of the unit locking mechanism;

[0075] Figure 27 This is a schematic diagram of the locking unit of the interlocking mechanism in the separated position.

[0076] Figure 28 This is a schematic diagram of the unlocking unit of the locking mechanism in the separated position unit;

[0077] Figure 29 This is a schematic diagram of the locking unit of the interlocking mechanism in the connection and test positions.

[0078] Figure 30 This is a structural diagram of the emergency unlocking unit of the interlocking mechanism in the connection and test positions.

[0079] Figure 31 This is a structural schematic diagram of the movable drawer unit assembly in the separated position;

[0080] Figure 32 This is a schematic diagram of the movable drawer unit assembly at the test location;

[0081] Figure 33 This is a structural schematic diagram of the movable drawer unit assembly at the connection position;

[0082] Figure 34 A schematic diagram of a movable drawer unit for power distribution circuits with a cabinet width of 600mm, a unit depth of 450mm, and a unit height of 150mm.

[0083] Figure 35 A schematic diagram of a movable drawer unit for power distribution circuits with a cabinet width of 600mm, a unit depth of 450mm, and a unit height of 200mm.

[0084] Figure 36 This is a structural diagram of a movable drawer unit for power distribution circuits with a cabinet width of 600mm, a unit depth of 450mm, and a unit height of 400mm.

[0085] Figure 37 A schematic diagram of a movable drawer unit for power distribution circuits with a cabinet width of 500mm, a unit depth of 450mm, and a unit height of 150mm.

[0086] Figure 38 A schematic diagram of a 250A movable drawer unit for power distribution circuits, with a cabinet width of 500mm, a unit depth of 450mm, and a unit height of 200mm.

[0087] Figure 39 This is a structural diagram of a movable drawer unit for power distribution circuits with a cabinet width of 500mm, a unit depth of 450mm, and a unit height of 400mm.

[0088] Figure 40 A structural diagram of a switch cabinet with movable drawer units of 150mm, 200mm, 300mm, and 400mm in height;

[0089] In the diagram, 1. Position interlock drive plate, 2. Movable part position locking plate, 3. Slide groove, 4. Slide groove screw, 5. Position locking clearance groove, 6. Position display drive plate, 7. Position display plate, 8. Display guide groove, 9. Push screw position locking plate, 10. Push screw, 11. Position locking slot, 12. Mounting base plate, 13. Closing interlock slot, 14. Closing interlock locking plate, 14-1. Closing lock plate, 14-2. Closing plug plate, 15. T-shaped sliding column, 1 6. Unit compartment; 16-1. Unit compartment rear plate; 17. Guide rail; 18. Push interlock base plate; 19. Slide bracket; 20. Lead screw mounting seat; 21. Lead screw nut; 22. Lead screw nut mounting seat; 23. Balance pressure plate; 24. Top cover plate; 25. Side plate; 26. Unit rear plate; 27. Lead screw nut plate; 28. Rear bottom plate; 29. ​​Main circuit connector; 30. Auxiliary circuit connector; 31. Operating bushing; 32. Position operation unlocking plate; 33. Torsion spring; 34. Positioning shaft; 3 5. Fixed shaft, 36. Limit switch push head, 37. Limit switch, 38. Position display base, 39. Display drive shaft, 40. Closing interlock fixing bracket, 41. Closing interlock traction plate, 41-1. Arc-shaped traction slide, 42. Hand crank operation hole, 43. Opening / closing shaft, 43-1. Telescopic bushing, 43-2. ​​Limit bushing, 43-3. Handle side shaft, 43-4. Switch side shaft, 44. Connection position positioning port, 45. Test position positioning port, 4 6. Separation position positioning port; 47. Mounting base; 48. Handle; 49. Unlocking pressure plate; 50. Unit locking plate; 51. Compression spring; 52. Base plate locking slot; 53. Instrument panel; 54. Circuit breaker; 55. Hook plate; 56. Unit door; 57. Operation panel; 57-1. Crank handle entry hole; 57-2. Position display window; 57-3. Position unlocking button; 57-4. Hole blocking plate; 58. Switch opening and closing handle; 59. Door interlock unlocking hole; 60. Door lock. Detailed Implementation

[0090] To address the technical problems existing in the current technology and to provide a feasible solution for realizing a movable drawer unit with a cabinet width of 500mm and a unit height of 150mm, the following considerations are made: The fixed and movable parts of the movable drawer unit are fixed and cannot be changed. The maximum internal width of a movable drawer unit with a cabinet width of 500mm is only 414mm. If the existing position interlocking mechanism and its matching position display mechanism are used, the space on the left side of the fixed part is insufficient to accommodate the spatial arrangement of the unit locking mechanism, making it impossible to realize a movable drawer unit with a cabinet width of 500mm. Therefore, a position interlocking mechanism needs to be provided. This position interlocking mechanism has a reduced external size, and the space occupied by this position interlocking mechanism and its matching position display mechanism on the fixed left side is reduced, thus satisfying the arrangement of the unit locking mechanism.

[0091] In addition, the existing position interlocking mechanism has a very complex structure, occupying a height of 30mm. Furthermore, the closing interlocking mechanism that is matched with this position interlocking mechanism occupies a minimum height of 82mm, which cannot be reduced. The opening and closing stroke of the crank arm of the closing interlocking mechanism also occupies height. The unit height of 200mm cannot be changed, and it is impossible to achieve a unit height of 150mm.

[0092] Furthermore, the maximum internal width of a 500mm wide unit is only 414mm. If the movable drawer unit still relies on rollers or steel shafts on the side of the outer beam of the fixed part for pushing and guiding, the internal width of the unit will be even smaller, making it impossible to achieve the 414mm internal width. If the internal width of the unit is less than 414mm, the feasibility of arranging the main and auxiliary circuit connectors at the rear of the movable part cannot be met. Moreover, the existing pushing and guiding structure places too high demands on the sheet metal processing precision of the movable drawer unit's sheet metal components, especially the outer beam, which fails to meet design requirements, leading to pushing failures. Therefore, a new pushing and guiding structure is needed.

[0093] Therefore, the position interlocking mechanism needs to be innovatively designed to simplify the structural design and reduce costs; and reduce the space occupied by the position interlocking mechanism, position display mechanism, and closing interlocking mechanism to make it feasible to achieve a cabinet width of 500mm and a unit height of 150mm; at the same time, the structure of the movable part positioned by the outer beam should be changed to solve the design problem that causes propulsion failure.

[0094] Based on the above considerations, the main inventive contents of this utility model are as follows:

[0095] 1. The movable part of the position interlocking mechanism, the position locking plate 2, is located on the back of the unit. The movable part position locking plate 2 has a positioning guide surface and a position positioning port. The movable part position locking plate 2 also has a display guide groove 8 for position display. The movable part position locking plate 2 is connected to the fixed part in a way that allows it to slide back and forth through a slidable connection structure. This design reduces the overall length of the position interlocking mechanism, reduces the space occupied on the left side of the fixed part, and also reduces the space occupied by the position display mechanism and the closing interlocking mechanism that work with it. This allows a cabinet width of 500mm to be achieved. Based on the 500mm cabinet width, a cabinet width of 600mm can also be achieved.

[0096] 2. The position interlocking mechanism synchronously locks the movable part and the push screw 10 of the hand-cranked push mechanism. The position locking plate 9 of the push screw of the position interlocking mechanism is located at the front of the fixed part, so that this unit can be equipped with a closing interlocking mechanism with small space occupation. While achieving a cabinet width of 500mm, the minimum unit height can be 150mm.

[0097] 3. The outer beam of the fixed part is eliminated. The movable drawer unit uses T-shaped sliding columns 15 to hook and cooperate with the guide rails 17 in the unit chamber 16 for pushing and guiding. This simplifies the unit structure, reduces the processing accuracy requirements of sheet metal parts, reduces costs, reduces the amount of steel plate used, solves the pushing failure problem, and controls the upward tilting of the rear of the movable part. After the movable drawer unit is locked in the unit chamber 16, the T-shaped sliding columns 15 on the movable part hook with the guide rails 17, making the pushing limit gap of the movable part smaller. The pushing balance is completely determined within 0.25mm to 0.4mm and remains unchanged. This eliminates the defect of damage to the pushing screw 10 and screw nut 21 due to extrusion. The fit gap of the movable connection structure between the fixed part and the movable part is no longer related to the pushing limit, no longer subject to force, and no longer requires control of the fit gap. Correspondingly, the processing accuracy requirements of sheet metal parts are reduced.

[0098] 4. After eliminating the outer beam in the fixed part, the only components of the movable drawer unit requiring specialized mold sheet metal processing to ensure machining accuracy are the sheet metal parts of the fixed part and the threaded mother plate 27 of the movable part. After dividing the base plate of the movable part into the threaded mother plate 27 and the rear base plate 28, the applicant, as the supplier to the switchgear equipment manufacturer, only needs to provide the switchgear equipment manufacturer with components including interlocking mechanisms, etc. Figure 20 The unit assembly shown can be assembled separately. The switchgear equipment manufacturer can process other components on its own, which reduces the cost for users to purchase switchgear equipment from the switchgear equipment manufacturer.

[0099] The following is a detailed description of a specific embodiment of the present invention.

[0100] like Figures 1-13 As shown, an interlocking mechanism for a movable drawer unit includes a position interlocking mechanism, which comprises:

[0101] Position interlock drive plate 1 is mounted on the fixed part of the movable drawer unit and can swing left and right, and swings to one side under the action of the elastic element.

[0102] The movable part position locking plate 2 is used to cooperate with the position interlock drive plate 1 for position positioning. The movable part position locking plate 2 is located on the back of the movable drawer unit. The movable part position locking plate 2 is fixed to the movable part and is used to move the movable part position locking plate 2 back and forth with the movable part. The movable part position locking plate 2 has a positioning guide surface with position positioning holes arranged in the front and back. Specifically, the rear end of the movable part position locking plate 2 is fixed to the movable part by self-tapping screws.

[0103] The position interlock drive plate 1 has a positioning element that extends to the back of the fixed part and cooperates with the positioning guide surface. The position interlock drive plate 1 swings to one side under the action of the elastic element to make the positioning element fit the positioning guide surface, and when the movable part moves back and forth into the corresponding position, it is embedded in the corresponding position positioning hole to position the movable part.

[0104] The movable part position locking plate 2 is connected to the fixed part in a way that allows it to move back and forth via a translatable connection structure.

[0105] The movable connection structure is specifically a sliding groove connection structure, which includes a sliding groove 3 and a sliding groove screw 4 that passes through the sliding groove 3 for connection and installation. Specifically, the sliding groove 3 and the sliding groove screw 4 are located on the movable part position locking plate 2 and the fixed part, respectively.

[0106] In this embodiment, the positioning guide surface is located inside the movable part position locking plate 2, the movable part position locking plate 2 has a position locking clearance groove 5, and the positioning guide surface is one side of the position locking clearance groove 5.

[0107] The interlocking mechanism of the movable drawer unit also includes a position display mechanism. The position display mechanism is installed on the fixed part of the movable drawer unit. The position display mechanism has a position display drive plate 6. The position display drive plate 6 is swayably installed on the fixed part of the movable drawer unit. The movable part position locking plate 2 has a display guide groove 8. The position display drive plate 6 has a display drive component that cooperates with the display guide groove 8. The display drive component extends to the back of the fixed part and is embedded in the display guide groove 8. During the process of the movable part moving back and forth into the corresponding position, the display guide groove 8 drives the position display drive plate 6 to swing left and right through the display drive component. The swing of the position display drive plate 6 drives the position display plate 7 of the position display mechanism to move and perform position display.

[0108] The position interlocking mechanism also includes a push screw position locking plate 9 driven by a position interlocking drive plate 1. The head end of the push screw position locking plate 9 is inserted into the position locking slot 11 on the side of the front end of the push screw 10 to lock the position of the push screw 10. The push screw position locking plate 9 and the position interlocking drive plate 1 are mounted on a mounting base plate 12 and are mounted on the fixed part of the movable drawer unit through the mounting base plate 12. The front part of the mounting base plate 12 has a locking plate fixing bracket protruding from the mounting base plate 12. The push screw position locking plate 9 can be mounted on the locking plate fixing bracket by a lateral connection structure. The upper ends of the locking plate fixing bracket and the push screw position locking plate 9 both have a closing interlocking slot 13. When the push screw position locking plate 9 locks the position of the push screw 10, the closing interlocking slot 13 on the locking plate fixing bracket and the push screw position locking plate 9 coincide.

[0109] The interlocking mechanism of the movable drawer unit also includes a closing interlocking mechanism, which is installed on the fixed part of the movable drawer unit. The closing interlocking mechanism has a closing interlocking locking plate 14 that moves up and down under the drive of the opening and closing shaft 43. The closing interlocking locking plate 14 locks the position interlocking mechanism and the pushing screw 10 by embedding it into the locking plate fixing bracket and the closing interlocking slot 13 on the push screw position locking plate 9.

[0110] like Figures 14-40 As shown, a movable drawer unit includes a fixed part and a movable part, which are interlocked by the interlocking mechanism of the movable drawer unit described above.

[0111] The fixed part and the movable part have a sliding connection structure for connecting them to each other in a way that allows them to slide back and forth. The bottom of the movable part has a T-shaped slide post 15 for engaging with the guide rail 17 inside the unit compartment 16 to guide and limit the unit's advancement. The sliding connection structure between the fixed part and the movable part is located on the left and right sides of the movable drawer unit.

[0112] Specifically, the fixed part includes a push-locking base plate 18 and slide brackets 19 on both sides of the push-locking base plate 18. A push screw 10 is installed on the fixed part. The push-locking base plate 18 is used for the installation of the push screw 10 and the position interlocking mechanism. The slide brackets 19 on both sides also extend to both sides of the movable part. The movable connection structure between the fixed part and the movable part is located between the slide brackets 19 and the movable part. The movable connection structure between the fixed part and the movable part is specifically a slide-type connection structure. The slide-type connection structure specifically includes a slide 3 and a slide screw 4 that passes through the slide 3 for connection and installation. The slide 3 is located on the side of the slide bracket 19. The slide screw 4 passes through the slide 3 and is screwed onto the movable part to connect the slide bracket 19 and the movable part in a way that allows them to slide back and forth. Preferably, there are at least two slide screws 4 in the movable connection structure on each side.

[0113] Of course, it is also possible that the slide groove 3 is located on the side of the movable part, and the slide groove screw 4 passes through the slide groove 3 and is screwed onto the slide groove bracket 19 to connect the slide groove bracket 19 and the movable part in a way that allows them to slide back and forth.

[0114] The clearance between the lead screw 10 and the nut 21 is designed to be 0.3mm. The clearance between the sliding bracket 19 of the fixed part and the sliding connection structure of the movable part is generally designed to be 0.25mm, which is smaller than the clearance between the lead screw 10 and the nut 21.

[0115] The lead screw 10 is mounted on the push interlock base plate 18 via the lead screw mounting seat 20. The movable part has a lead screw nut 21 that cooperates with the lead screw 10 to push the movable part to move back and forth. The lead screw nut 21 is mounted on the movable part via the lead screw nut mounting seat 22. The lead screw mounting seat 20 and the lead screw nut mounting seat 22 have a balance pressure plate 23 for pushing, guiding and limiting the lead screw 10. One end of the balance pressure plate 23 is fixedly connected to the lead screw nut mounting seat 22, and the other end of the balance pressure plate 23 is movably connected to the lead screw mounting seat 20 via a movable connection structure. The movable connection structure between the balance pressure plate 23 and the lead screw mounting seat 20 is specifically a groove-type connection structure. The groove-type connection structure specifically includes a groove 3 and a groove screw 4 that passes through the groove 3 for connection and installation.

[0116] Of course, it is also possible that one end of the balance plate 23 is fixedly connected to the lead screw mounting base 20, and the other end of the balance plate 23 is connected to the lead screw mounting base 22 through a movable connection structure that can move back and forth.

[0117] The propulsion interlocking base plate 18 is also equipped with a position display mechanism and a unit locking mechanism. An upper cover plate 24 is installed on the propulsion interlocking base plate 18, which covers the position interlocking mechanism, the position display mechanism and the unit locking mechanism. The closing interlocking mechanism is installed on the upper cover plate 24.

[0118] The movable part includes a base plate, side plates 25 fixed on both sides of the base plate, and a unit rear plate 26 fixed at the rear end of the base plate. The base plate is divided into two parts: a front threaded mother plate 27 and a rear base plate 28. The threaded mother plate 27 is used for the installation of the threaded mother 21, and the unit rear plate 26 is used for the installation of the main circuit connector 29 and the auxiliary circuit connector 30. The movable part is connected to the fixed part in a horizontally movable manner through the threaded mother plate 27.

[0119] like Figures 31-39 As shown, a movable drawer unit assembly includes the aforementioned movable drawer unit and unit chamber 16.

[0120] The following is a more detailed description of the structure of each part of the movable drawer unit and the movable drawer unit assembly in this embodiment.

[0121] like Figure 4 As shown, the front end of the push screw 10 has an operating sleeve 31, the side of the operating sleeve 31 is a position locking slot 11, the cross-section of the position locking slot 11 is rectangular, and the front end of the operating sleeve 31 is a hand crank operation hole 42 that cooperates with the crank handle.

[0122] The movable drawer unit and movable drawer unit assembly of this embodiment have three positions: a separated position, a test position, and a connected position. Therefore, the position interlocking mechanism is also a three-position interlocking mechanism. Of course, the movable drawer unit can also be a two-position movable drawer unit, namely a separated position and a connected position.

[0123] like Figures 1-3 As shown, the position interlocking mechanism specifically includes a mounting base plate 12, a position interlocking drive plate 1, a push screw position locking plate 9, and a position operation unlocking plate 32. The elastic element that drives the position interlocking drive plate 1 to swing to one side is a torsion spring 33. The positioning element on the position interlocking drive plate 1 that cooperates with the positioning guide surface is a positioning shaft 34. The position interlocking drive plate 1 is swayably mounted on the mounting base plate 12 via a fixed shaft 35. The torsion spring 33 is fitted on the fixed shaft 35 and drives the position interlocking drive plate 1 to swing to one side. The front of the mounting base plate 12 has a locking plate fixing bracket that protrudes from the mounting base plate 12. The push screw position locking plate 9 is swayably mounted on the locking plate fixing bracket via a slidable connection structure. The upper ends of the locking plate fixing bracket and the push screw position locking plate 9 both have a closing interlocking slot 13. When the push screw position locking plate 9 locks the push screw 10, the closing interlocking slot 13 on the locking plate fixing bracket and the push screw position locking plate 9 coincides. The position interlock drive plate 1 has a forward-extending interlock traction head for driving the position locking plate 9 of the push screw to move left and right. The position operation unlocking plate 32 is mounted on the position interlock drive plate 1 and is used to drive the position interlock drive plate 1 to swing in the opposite direction against the elastic force of the torsion spring 33. The position operation unlocking plate 32 has a limit switch pressing head 36 for pressing the limit switch 37. The positioning shaft 34 passes through the clearance grooves on the mounting base plate 12 and the push interlock base plate 18 and enters the position locking clearance groove 5.

[0124] The position display mechanism specifically includes a position display drive board 6, a position display board 7, and a position display base 38. The position display board 7 is movably disposed within the position display base 38 and is fixed to the front end face of the push-lock base plate 18 via the position display base 38. The position display drive board 6 is mounted on the mounting base 12, which can swing left and right via another fixed shaft 35. The display drive component on the position display drive board 6 is specifically a display drive shaft 39. The display drive shaft 39 passes through the clearance grooves on the mounting base 12 and the push-lock base plate 18 and enters the display guide groove 8.

[0125] like Figures 19-22As shown, the closing interlocking mechanism specifically includes a closing interlocking fixing bracket 40, a closing interlocking traction plate 41, and a closing interlocking locking plate 14. The closing interlocking fixing bracket 40 is fixed on the upper cover plate 24 on the push interlocking base plate 18. The closing interlocking fixing bracket 40 has a through hole for the opening and closing shaft rods. The closing interlocking traction plate 41 has an operating hole for the opening and closing shaft rods and an arc-shaped traction groove 41-1. The closing interlocking locking plate 14 can be slidably installed on the closing interlocking fixing bracket 40. The closing interlocking locking plate 14 has a closing locking plate 14-1 and a closing plugging plate 14-2. The opening and closing shaft 43 is a telescopic opening and closing shaft, including a telescopic bushing 43-1, a limit bushing 43-2, a handle-side shaft 43-3, and a switch-side shaft 43-4. The handle-side shaft 43-3 is fixedly connected to the telescopic bushing 43-1, and the front end of the switch-side shaft 43-4 is inserted into the rear port of the telescopic bushing 43-1, and they are telescopically connected to each other. When the handle side shaft 43-3 is rotated 90 degrees to the right, the closing interlock locking plate 14 moves down, and the closing lock plate 14-1 is embedded into the closing interlock slot 13 on the locking plate fixing bracket and the push screw position locking plate 9 to perform closing interlock. The push screw position locking plate 9, which is inserted into the position locking slot 11 to lock the position of the push screw 10, cannot move to the left, and the position interlock mechanism cannot be unlocked. The closing blocking plate 14-2 completely blocks the hand crank operation hole 42 of the push screw 10, and the crank handle for operating the push screw 10 cannot be inserted into the hand crank operation hole 42 to perform the three-position operation of the unit. When the handle side shaft 43-3 is rotated 90 degrees to the left, the closing interlock locking plate 14 moves up, and the closing lock plate 14-1 disengages from the closing interlock slot 13 to release the closing interlock. The push screw position locking plate 9 can move freely, and the position interlock mechanism can be unlocked. The closing blocking plate 14-2 moves up, exposing the hand crank operation hole 42.

[0126] like Figure 5 As shown, the positioning ports arranged front and back on the positioning guide surface of the movable part position locking plate 2 are, from front to back, the connection position positioning port 44, the test position positioning port 45, and the separation position positioning port 46. The positioning shaft 34 engages with the separation position positioning port 46 for separation position positioning, the positioning shaft 34 engages with the test position positioning port 45 for test position positioning, and the positioning shaft 34 engages with the connection position positioning port 44 for connection position positioning.

[0127] like Figure 14 , 15As shown in Figure 16, the lead screw 10 includes a front smooth section and a rear lead screw section. The lead screw 10 is inserted into the lead screw mounting base 20 through the smooth section. The lead screw mounting base 20 has copper sleeves at both ends for mounting the smooth section. The operating bushing 31 is fitted onto the end of the smooth section extending out of the lead screw mounting base 20 and fixed by a fixing pin. The balance pressure plate 23 is connected to the lead screw mounting base 20 through two sliding groove connection structures on the left and right sides. The balance pressure plate 23 ensures a higher degree of balance in the left-right and up-down directions of the drive engagement between the lead screw 10 and the nut 21, reaching ±0.3mm. This reduces friction during engagement, thus minimizing damage to the lead screw 10 and the nut 21.

[0128] like Figure 26 As shown, the unit locking mechanism includes a mounting base 47 and a handle 48, an unlocking pressure plate 49, a unit locking plate 50, and a compression spring 51 mounted on the mounting base 47. The unlocking pressure plate 49 is reset by the spring.

[0129] like Figure 27 As shown, the movable drawer unit is in the separated position, and the unit locking mechanism is in the separated locked position. The movable part presses against the unlocking plate 49. Under the action of the compression spring 51, the locking head of the unit locking plate 50 inserts into the locking slot 52 of the bottom plate of the unit chamber 16, locking the movable drawer unit. By lifting the handle 48, the unit locking plate 50 is lifted, and the locking head of the unit locking plate 50 disengages from the locking slot 52 of the bottom plate of the unit chamber 16, unlocking the movable drawer unit. The movable drawer unit can then be pulled out of the unit chamber 16, and the unit locking mechanism is in the separated unlocked position. Figure 28 As shown.

[0130] like Figure 29 As shown, the movable drawer unit is in the test and connection position, the unit locking mechanism is in the locked state, the movable part is disengaged from the unlocking plate 49, the unlocking plate 49 blocks the unit locking plate 50, the unit locking plate 50 cannot be lifted, and the movable drawer unit is in the locked state.

[0131] like Figure 30 As shown, the movable drawer unit is in the test / connection position, the unit locking mechanism is in the emergency unlocking state, the movable part is disengaged from the unlocking pressure plate 49, the unlocking pressure plate 49 is pressed by hand with a tool to disengage the unlocking pressure plate 49 from the unit locking plate 50, the unit locking plate 50 can be lifted by the handle 48, the locking head of the unit locking plate 50 disengages from the locking slot 52 of the bottom plate of the unit chamber 16, the movable drawer unit is unlocked, and the movable drawer unit can be pulled out of the unit chamber 16 in an emergency.

[0132] like Figure 18As shown, the base plate of the movable part has a total of four T-shaped sliding pillars 15. Two of the T-shaped sliding pillars 15 are located on the left side of the bottom of the movable part and are arranged front to back, for engaging with the guide rail 17 on the left side inside the unit chamber 16. The other two T-shaped sliding pillars 15 are located on the right side of the bottom of the movable part and are arranged front to back, for engaging with the guide rail 17 on the right side inside the unit chamber 16. Specifically, two are fixed to the threaded mother plate 27 and two are fixed to the rear base plate 28. The threaded mother plate 27 and the rear base plate 28 are fixed to each other at the end bends with self-tapping screws.

[0133] The upper cover 24 covering the interlocking base plate 18 is divided into left and right parts. A limit switch 37 is installed on the left upper cover 24. The limit switch pressing head 36 on the position operation unlocking plate 32 extends upward from the upper cover 24 to cooperate with the limit switch 37, pressing the limit switch 37. Figure 25 As shown, an instrument panel 53 is mounted on the upper cover 24 on the right side. The movable portion of the removable drawer unit has the main circuit actuator on the incoming line side, the main circuit actuator on the outgoing line side, the auxiliary circuit actuator, and the intelligent data actuator mounted on the unit rear plate 26. The circuit breaker 54 is fixed to the unit rear plate 26 by a mounting plate.

[0134] like Figure 23 As shown, the unit chamber 16, which is used in conjunction with the movable drawer unit, has two left and right guide rails 17, two left and right bottom plate locking slots 52, and two left and right hook plates 55. The two left and right hook plates 55 are used to engage with the hook plates 55 on the left and right sides of the bottom plate of the push-lock base plate 18. The T-shaped sliding column 15 of the bottom plate of the movable drawer unit is in an engaged state with the guide rails 17 in both the test position and the connected position. After the movable drawer unit is in the separated position, the movable drawer unit can be unlocked by lifting the handle 48 of the unit locking mechanism, and the movable drawer unit can be pulled out of the unit chamber 16.

[0135] When the movable drawer unit is pulled out of the unit chamber 16, the T-shaped slide column 15 is blocked by the front end of the guide rail 17 to prevent it from falling. The movable drawer unit is slightly lifted, and the T-shaped slide column 15 exits the guide rail groove of the guide rail 17 through the slide column inlet at the front end of the guide rail 17, and then crosses the front end of the guide rail 17, so the movable drawer unit can be pulled out.

[0136] The hook-fit clearance between the T-shaped slide column 15 and the guide rail 17 is designed to be 0.4mm, and the single-sided fit clearance on both sides of the slide groove of the T-shaped slide column 15 and the guide rail 17 is designed to be 0.25mm. This makes the maximum upward lifting limit of the rear part of the movable part only 0.4mm, and the upward lifting limit of the front part of the movable part only 0.3mm. This is the same as the fit clearance of 0.3mm between the push screw and the nut, so that the push screw 10 and the nut 21 will not be damaged by extrusion, greatly improving reliability and mechanical life of more than 1000 times.

[0137] The rear of unit compartment 16 is unit compartment rear panel 16-1, which is used to install the main circuit static plug on the incoming side, the main circuit static plug on the outgoing side, the auxiliary circuit static plug, and the intelligent data static plug. Unit door 56 is fixed on the cabinet column.

[0138] like Figure 24 As shown, the unit door 56 is equipped with an operation panel 57, a switch handle 58, a door interlock unlocking hole 59, and a door lock 60. The operation panel 57 has a crank handle entry hole 57-1, a position display window 57-2, a position unlocking button 57-3, and a blocking plate 57-4. The crank handle entry hole 57-1 corresponds to the hand crank operation hole 42 of the lead screw 10, the position display window 57-2 corresponds to the position display panel 7, the position unlocking button 57-3 corresponds to the position operation unlocking plate 32, and the blocking plate 57-4 can move left and right. Moving the blocking plate 57-4 to the left opens the crank handle entry hole 57-1, and moving the blocking plate 57-4 to the right blocks the crank handle entry hole 57-1. The switch handle 58 corresponds to the handle side shaft 43-3.

[0139] The three-position operation process of this embodiment 1 is as follows:

[0140] Separated Position: The movable drawer unit is inserted into the unit chamber 16, the T-shaped slide column 15 enters the guide rail groove of the guide rail 17, the locking head of the unit locking plate 50 of the unit locking mechanism is inserted into the bottom plate locking slot 52 of the unit chamber 16 to lock the movable drawer unit, the movable part of the movable drawer unit is in the separated position, the positioning shaft 34 is engaged in the separated position positioning port 46 to position the separated position, the head end of the push screw position locking plate 9 is inserted into the side position locking slot 11 of the front end of the push screw 10 to lock the position of the push screw 10, the position display plate 7 is in the separated display position, the position interlocking mechanism closes the unit door 56, the door lock 60 of the unit door 56 locks the cabinet column, the position display plate 7 displays "Separated" through the position display window 57-2, such as Figure 4 , 5 6, 7 and 31.

[0141] Separation to the test position: Insert the crank handle into the hand crank operation hole 42 of the push screw 10 through the crank handle inlet hole 57-1. Press and hold the position unlock button 57-3, causing the position operation unlock plate 32 to drive the push screw position locking plate 9 to move to the left through the position interlock drive plate 1, disengaging it from the position locking slot 11 of the push screw 10, thus unlocking the push screw 10. At the same time, the positioning shaft 34 moves out of the separation position positioning port 46, as shown. Figure 8 and 9As shown. By cranking the push screw 10 with the handle, the push screw 10 engages with the screw nut 21, pushing the movable part to move. When the movable part is pushed to the test position, the position interlock drive plate 1 swings back to its original position under the action of the torsion spring 33. The positioning shaft 34 engages with the test position positioning port 45 to position the test position. The display guide groove 8 on the movable part position locking plate 2 drives the position display drive plate 6 to swing via the display drive shaft 39. The swing of the position display drive plate 6 drives the position display plate 7 to move. The position display plate 7 displays "Test" through the position display window 57-2. The swinging back of the position interlock drive plate 1 also drives the push screw position locking plate 9 to move to the right, inserting into the position locking slot 11 of the push screw 10 to lock the push screw 10. When the movable part is pushed to the test position, the auxiliary circuit moving plug and the auxiliary circuit stationary plug on the movable part are connected, as shown... Figure 10 , 11 And 32.

[0142] To advance the test to the connection position: Insert the crank handle into the hand crank operation hole 42 of the lead screw 10 through the crank handle inlet hole 57-1. Press and hold the position unlock button 57-3, causing the position operation unlock plate 32 to drive the lead screw position locking plate 9 to move to the left through the position interlock drive plate 1, disengaging it from the position locking slot 11 of the lead screw 10 and unlocking the lead screw 10. At the same time, the positioning shaft 34 moves out of the test position positioning port 45. By cranking the lead screw 10 with the crank handle, the lead screw 10 engages with the nut 21, pushing the movable part to move. When the movable part is pushed to the connection position, the position interlock drive plate 1 swings back to its original position under the action of the torsion spring 33. The positioning shaft 34 engages with the connection position positioning port 44 to position the connection position. The display guide groove 8 on the movable part position locking plate 2 drives the position display drive plate 6 to swing through the display drive shaft 39. The swing of the position display drive plate 6 drives the position display plate 7 to move. The position display plate 7 displays "Connect" through the position display window 57-2. The swinging back of the position interlock drive plate 1 also drives the push screw position locking plate 9 to move to the right and insert into the position locking slot 11 of the push screw 10 to lock the push screw 10. When the movable part is pushed to the connection position, the main circuit moving plug and the main circuit stationary plug on the movable part are connected, such as Figure 12 , 13 As shown in Figure 33.

[0143] To remove the movable drawer unit: Reverse the above steps, move the movable part to the separated position, and then lift the handle 48. This will lift the unit locking plate 50, disengaging the locking head of the unit locking plate 50 from the locking slot 52 on the bottom plate of the unit chamber 16, thus unlocking the movable drawer unit. The movable drawer unit can then be pulled out of the unit chamber 16. In the event of a malfunction in the position interlocking mechanism or the hand-cranked push mechanism, an emergency unlocking mechanism can be operated to allow the movable drawer unit to be pulled out of the unit chamber 16 in an emergency.

[0144] Figure 7 , 14 Figures 25, 31, 33, and 37-39 show structural diagrams of a 500mm wide movable drawer unit, including its fixed and movable parts. As can be seen in the figures, the space on the left side of the fixed part perfectly accommodates the arrangement of the position interlocking mechanism, position display mechanism, closing interlocking mechanism, and unit locking mechanism. Correspondingly, as... Figures 34-36 Simultaneous operation of movable drawer units with a cabinet width of 600mm can also be achieved.

[0145] The advantages of this embodiment are:

[0146] The design of the movable part position locking plate 2 being located on the back of the unit reduces the overall size of the position interlocking mechanism and the space occupied on the left side of the fixed part. Furthermore, the position display mechanism and closing interlocking mechanism that work with it also occupy less space, making it possible to achieve a cabinet width of 500mm. Correspondingly, a cabinet width of 600mm can also be achieved simultaneously.

[0147] Compared with existing technologies, the position interlocking mechanism and the matching position display mechanism used in the movable drawer unit of this utility model are simple in structure and low in cost.

[0148] This utility model features a complete position interlocking mechanism and a matching position display mechanism, enabling simultaneous three-position positioning, display, and propulsion interlocking. The movable part is positioned in three positions by the position locking slot 5 on the movable part position locking plate 2 cooperating with the positioning element on the position interlocking drive plate 1. Simultaneously, the propulsion screw 10 is interlocked synchronously by the propulsion screw position locking plate 9, which is linked to the position interlocking drive plate 1. Finally, the three-position display is synchronously achieved by the display guide groove 8 on the movable part position locking plate 2 cooperating with the position display drive plate 6 of the position display mechanism.

[0149] The movable part position locking plate 2 is connected to the bottom surface of the fixed part through a sliding groove connection structure, which further balances the movable part and the fixed part, and makes the position interlocking mechanism and position display mechanism move flexibly and without jamming during the movement of the three positions of the movable part.

[0150] The position locking plate 9 of the position interlocking mechanism of this utility model is located at the front of the fixed part, which enables this unit to be equipped with a closing interlocking mechanism with a simple structure and smaller space occupation, ultimately achieving a unit height of 150mm, which can realize 12 circuits in one switch cabinet equipment.

[0151] The fixed part of this utility model eliminates the outer beam. The movable drawer unit uses a T-shaped sliding column 15 to hook and cooperate with the guide rail 17 in the unit chamber 16 for push-guide design. The fit gap between the movable connection structure between the fixed part and the movable part is no longer related to the push limit, no longer subject to force, and no longer requires control of the fit gap. This simplifies the unit structure, reduces the processing accuracy requirements of sheet metal parts, reduces costs, and reduces the amount of steel plate used.

[0152] Meanwhile, this design solves the problem of propulsion failure and controls the upward tilting of the rear of the movable part. After the movable drawer unit is locked in the unit chamber 16, the T-shaped sliding column 15 on the movable part hooks with the guide rail 17, making the propulsion limit gap of the movable part smaller and the propulsion balance completely determined within 0.25mm to 0.4mm without change. This eliminates the defect of damage to the propulsion screw 10 and screw nut 21 due to compression. Even for a 630A movable drawer unit with a main circuit connector 29 insertion pressure of 2500N, the connection surface of the main circuit connector 29 can meet the standard 100% when the movable part is pushed to the connection position. The propulsion mechanism will not be damaged, the reliability is greatly improved, the mechanical life reaches more than 1000 times, and the temperature rise of the main circuit connector 29 is guaranteed to be within 5K.

[0153] Based on the hook-and-loop engagement between the T-shaped slide column 15 and the guide rail 17 in the unit chamber 16, the reliability of the propulsion mechanism is further improved by adding a balance pressure plate 23 to the propulsion screw 10 and the screw nut 21.

[0154] After eliminating the outer beam in the fixed section, the only components of the movable drawer unit requiring specialized mold sheet metal processing to ensure machining accuracy are the sheet metal parts of the fixed section and the threaded mother plate 27 of the movable section. After dividing the base plate of the movable section into the threaded mother plate 27 and the rear base plate 28, the applicant, as the supplier to the switchgear equipment manufacturer, only needs to provide the switchgear equipment manufacturer with components including the interlocking mechanism, etc. Figure 20 The unit assembly shown can be assembled separately. The switchgear equipment manufacturer can purchase and process other components on its own, which reduces the cost for users to purchase switchgear equipment from the switchgear equipment manufacturer.

[0155] In this invention, the bottom of the movable part is connected to the bottom plate of the unit chamber 16 via a T-shaped sliding column 15 and a guide rail 17 for pushing and guiding. This changes the existing technology where the movable drawer unit uses outer rollers to engage with the guide rails 17 on both sides of the unit chamber 16 for pushing and guiding. This increases the inner width of the unit, meeting the space requirements for arranging 32 secondary plug-in points in a movable drawer unit with a cabinet width of 600mm and a unit height of 150mm when used for control circuits. It also meets the space requirements for arranging secondary plug-in points and RJ45 communication plug-in points in a movable unit switch cabinet with a cabinet width of 500mm when used for power distribution circuits and control circuits.

[0156] The installation method of the position locking plate 9 of the push screw of the position interlocking mechanism and the interlocking method of inserting it into the position locking slot 11 on the side of the push screw 10 make the interlocking force of the position interlocking mechanism on the push screw 10 large. If it is not unlocked, the push screw 10 cannot be moved by the crank handle in case of human error. Even if the crank handle is deformed, the interlocking mechanism will not be damaged. In addition, when the closing interlock is performed, the closing interlock locking plate 14 presses on the push screw position locking plate 9, which can further reduce the risk of deformation of the push screw position locking plate 9 under force.

[0157] The installation method of the lead screw 10 allows even non-professionals to replace it.

[0158] When the movable drawer unit is in the connected position, the position interlocking mechanism of this invention positions the movable part by engaging the position positioning slot on the position locking groove 5 on the movable part position locking plate 2 with the positioning component on the position interlocking drive plate 1. Simultaneously, the push screw position locking plate 9 interlocks the push screw 10. At the same time, the locking heads of the unit locking plates 50 on both sides of the fixed part of the unit are inserted into the locking slots 52 on the bottom plate of the unit chamber 16 to lock the movable drawer unit. This makes the unit more resistant to bumps and vibrations in the connected position, and can replace the fixed cabinet used on ships.

[0159] The miniaturized movable drawer unit and the switch cabinet equipment adapted to this unit have a small footprint. When in the separated position, the unit door 56 is closed and closely attached to the cabinet column, resulting in a high level of safety for operation and maintenance. Therefore, the miniaturized movable drawer unit of this invention is generally used in confined spaces, such as subways, offshore platforms, data centers, high-rise buildings, and ships, to improve the safety level of equipment maintenance. Of course, it is also applicable to all scenarios.

[0160] The overall cost of the movable drawer unit of this invention for use in power distribution circuits can be made comparable to that of economical drawer units currently used in the market.

[0161] Using a plug-in connection scheme for circuit breakers without lap joints, a 500mm wide switchgear unit with 7 units saves 6-8kg of copper in the connecting copper busbars compared to existing technologies, depending on the current rating. For a 2500A current rating switchgear unit with a 500mm wide cabinet, the horizontal busbars save 5.22kg of copper per unit compared to a 600mm wide switchgear unit.

[0162] Compared to the movable drawer unit disclosed in Chinese patent application 200920037161.2, the movable drawer unit of this utility model, used for power distribution circuits in a cabinet with a width of 600mm, can achieve a unit depth of 450mm, while the prior art can only achieve a unit depth of 500mm. This reduces the amount of steel plate used per unit by 1.8kg, resulting in a cost reduction of 10.8 yuan per unit (based on a steel plate unit price of 6 yuan). Furthermore, the movable drawer unit of this utility model, used for power distribution circuits in a cabinet with a width of 500mm, can also achieve a unit depth of 450mm. Compared to existing movable drawer units for power distribution circuits that can only achieve a cabinet width of 600mm and a unit depth of 500mm, this reduces the amount of steel plate used per unit by 3kg, resulting in a cost reduction of 18 yuan per unit (based on a steel plate unit price of 6 yuan). One switchgear unit has an average of 7 units. A switchgear unit with a cabinet width of 600mm, a cabinet depth of 1000mm, and a unit depth of 450mm can reduce the amount of steel plate used by 12.6kg. At a unit price of 6 yuan per steel plate, the cost of steel plate usage is reduced by 75.6 yuan. Applying 10,000 sets of switchgear units with the movable drawer units of this utility model for power distribution circuits can save 130 to 220 tons of steel plate.

[0163] The movable drawer unit technology of this utility model is adopted for power distribution circuits. Compared with the existing switch cabinet equipment with a cabinet width of 600mm and a cabinet depth of 1000mm, the volume of a switch cabinet equipment with a cabinet width of 500mm and a cabinet depth of 1000mm is reduced by 0.1㎡.

[0164] Compared to the movable drawer unit disclosed in Chinese patent application 200920037161.2, when used for control circuits, the switch cabinet equipment using the movable drawer unit of this utility model can achieve a unit depth of 500mm and a unit height of 150mm when the cabinet width is 600mm and the cabinet depth is 1000mm, while the unit height in the prior art can only be 200mm.

[0165] When used in control circuits, the movable drawer unit of this utility model can achieve a cabinet width of 500mm, a cabinet depth of 1000mm, and a unit depth of 500mm when the current rating is 63A to 250A. It can replace switch cabinet equipment with a cabinet width of 600mm for the same current rating.

[0166] When a 500mm wide control cabinet is used for a control circuit switchgear, the unit height of a movable drawer unit with a current rating of 63A to 100A can be as low as 150mm. In contrast, the minimum unit height of a movable drawer unit in the prior art is 200mm, and a single switchgear unit has only 9 circuits. This invention can achieve 12 circuits in a single switchgear unit, increasing the density of low-current control circuit equipment, saving copper in the horizontal busbar, reducing the total number of switchgear units, lowering costs, reducing the cabinet size and footprint, and virtually eliminating mechanical failures in unit propulsion. This invention is of great significance for engineering projects.

Claims

1. An interlocking mechanism for a movable drawer unit, characterized in that, Includes a position interlocking mechanism, the position interlocking mechanism comprising: Position interlock drive plate (1), which is swayably mounted on the fixed part of the movable drawer unit and swings to one side under the action of the elastic element; The movable part position locking plate (2) is used to cooperate with the position interlock drive plate (1) for position positioning. The movable part position locking plate (2) is located on the back of the movable drawer unit. The movable part position locking plate (2) is fixed to the movable part and is used to make the movable part position locking plate (2) move back and forth with the movable part. The movable part position locking plate (2) has a positioning guide surface and a front and rear arranged position positioning port on the positioning guide surface. The position interlock drive plate (1) has a positioning element that extends to the back of the fixed part and cooperates with the positioning guide surface. The position interlock drive plate (1) swings to one side under the action of the elastic element to make the positioning element fit the positioning guide surface, and embeds the corresponding position positioning hole when the movable part moves back and forth into the corresponding position to position the movable part.

2. The interlocking mechanism of the movable drawer unit according to claim 1, characterized in that: The movable part position locking plate (2) is connected to the fixed part in a way that allows it to move back and forth through a translatable connection structure.

3. The interlocking mechanism of the movable drawer unit according to claim 2, characterized in that: The movable part position locking plate (2) and the fixed part have a movable connection structure that is specifically a sliding groove connection structure. The sliding groove connection structure specifically includes a sliding groove (3) and a sliding groove screw (4) that passes through the sliding groove (3) for connection and installation.

4. The interlocking mechanism of the movable drawer unit according to claim 1, characterized in that: The positioning guide surface is located inside the movable part position locking plate (2), which has a position locking clearance groove (5), and the positioning guide surface is one side of the position locking clearance groove (5).

5. The interlocking mechanism of the movable drawer unit according to claim 1, characterized in that: It also includes a position display mechanism, which is installed on the fixed part of the movable drawer unit. The position display mechanism has a position display drive plate (6), which is swayably installed on the fixed part of the movable drawer unit. The movable part position locking plate (2) has a display guide groove (8), and the position display drive plate (6) has a display drive component that cooperates with the display guide groove (8). The display drive component extends to the back of the fixed part and is embedded in the display guide groove (8). During the process of the movable part moving back and forth into the corresponding position, the display guide groove (8) drives the position display drive plate (6) to swing through the display drive component. The swing of the position display drive plate (6) drives the position display plate (7) of the position display mechanism to move and perform position display.

6. The interlocking mechanism of the movable drawer unit according to claim 1, characterized in that: The position interlocking mechanism also includes a push screw position locking plate (9) driven by a position interlocking drive plate (1). The head end of the push screw position locking plate (9) is inserted into the position locking slot (11) on the side of the front end of the push screw (10) to lock the position of the push screw (10). The push screw position locking plate (9) and the position interlocking drive plate (1) are mounted on a mounting base plate (12) and mounted on the fixed part of the movable drawer unit through the mounting base plate (12). The front part of the mounting base plate (12) has a protruding mounting bracket. The locking plate fixing bracket of the mounting base plate (12) and the push screw position locking plate (9) can be installed on the locking plate fixing bracket by means of a movable connection structure. The upper ends of the locking plate fixing bracket and the push screw position locking plate (9) are both equipped with closing interlocking slots (13) for use in conjunction with the closing interlocking mechanism for closing interlocking. When the push screw position locking plate (9) locks the position of the push screw (10), the closing interlocking slots (13) on the locking plate fixing bracket and the push screw position locking plate (9) overlap.

7. A movable drawer unit, characterized in that: It includes a fixed part and a movable part, which are interlocked by the interlocking mechanism of the movable drawer unit as described in claim 1.

8. The movable drawer unit according to claim 7, characterized in that: The fixed part and the movable part have a translatable connection structure for connecting the fixed part and the movable part together in a translatable manner. The bottom of the movable part has a T-shaped sliding column (15) for hooking and cooperating with the guide rail (17) in the unit chamber (16) for propulsion guidance and limiting.

9. The movable drawer unit according to claim 8, characterized in that: The movable connection structure between the fixed part and the movable part is located on the left and right sides of the movable drawer unit.

10. The movable drawer unit according to claim 8, characterized in that: The fixed part includes a push interlock base plate (18) and slide brackets (19) on both sides of the push interlock base plate (18). A push screw (10) is installed on the fixed part. The push interlock base plate (18) is used for the installation of the push screw (10) and the position interlocking mechanism. The slide brackets (19) on both sides also extend to both sides of the movable part. The movable connection structure between the fixed part and the movable part is located on the slide bracket (19) and the movable part respectively. The movable connection structure between the fixed part and the movable part is specifically a slide-type connection structure. The slide-type connection structure specifically includes a slide (3) and a slide screw (4) that passes through the slide (3) for connection and installation. The slide (3) is located on the side of the slide bracket (19). The slide screw (4) passes through the slide (3) to connect the slide bracket (19) and the movable part together in a way that allows them to slide back and forth. Alternatively, the slide (3) is located on the side of the movable part, and the slide screw (4) passes through the slide (3) to connect the slide bracket (19) and the movable part together in a way that allows them to slide back and forth.

11. The movable drawer unit according to claim 10, characterized in that: The lead screw (10) is mounted on the push interlock base plate (18) via the lead screw mounting seat (20). The movable part has a nut (21) that cooperates with the lead screw (10) to push the movable part to move back and forth. The nut (21) is mounted on the movable part via the nut mounting seat (22).

12. The movable drawer unit according to claim 10, characterized in that: The propulsion interlocking base plate (18) is also equipped with a position display mechanism and a unit locking mechanism. An upper cover plate (24) is installed on the propulsion interlocking base plate (18). The upper cover plate (24) covers the position interlocking mechanism, the position display mechanism and the unit locking mechanism. A closing interlocking mechanism is installed on the upper cover plate (24).

13. The movable drawer unit according to claim 7 or 10, characterized in that: The movable part includes a base plate, which is divided into two parts: a front threaded mother plate (27) and a rear base plate (28). The threaded mother plate (27) is used for the installation of the threaded mother (21). The movable part is connected to the fixed part in a forward and backward manner through the threaded mother plate (27).

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