Indoor metal-clad movable switch cabinet based on double power supply

Abstract

This invention relates to the field of distribution cabinet technology, specifically to an indoor metal-clad withdrawable switchgear based on dual-power supply, comprising: a switchgear body, wherein a contact seat is disposed within the switchgear body; a trolley, wherein a rotatable moving contact is disposed on the trolley; a second gear, wherein the second gear is connected to the rotating shaft of the moving contact via a clearance structure; a drive structure, wherein the drive structure is connected to the second gear and wherein a guide portion is disposed on the drive structure; a rotary connection structure, wherein the rotating shaft of the moving contact is connected, the rotary connection structure is sleeved on the drive structure, and wherein a fitting shaft is disposed inside the rotary connection structure, the fitting shaft cooperating with the guide portion; and a locking structure, wherein the locking structure is connected to the rotating shaft of the moving contact, the locking structure being able to unlock when the moving contact moves away from the contact seat and lock again when the moving contact rotates 180°, thereby improving the alignment accuracy between the moving contact and the contact seat after switching is completed.

Description

Technical Field

[0001] This invention relates to the field of power distribution cabinet technology, specifically an indoor metal-clad withdrawable switchgear based on dual power supply. Background Technology

[0002] In dual-power supply systems, indoor metal-clad withdrawable switchgear is often used to achieve load switching between main and backup circuits. Traditional solutions require two sets of fixed contacts to be arranged on a single trolley, and the moving contact is moved between the two sets of contact seats by translation or rotation to ensure that one circuit is conducting while the other is isolated.

[0003] However, regardless of translation or rotation, the existing structure always faces two major challenges: accurate insertion and consistent phase sequence. Translation switching relies on lead screws or guide rails, requiring the moving contact to simultaneously meet both vertical insertion stroke accuracy and horizontal positioning accuracy. After long-term operation, wear, deformation, and accumulated errors in the guide bracket and mating clearance cause millimeter-level misalignment between the moving contact and the contact seat's central axis, leading to insertion jamming, poor contact, or even bent contact fingers. While rotation switching eliminates the need for long linear guide rails, motor positioning errors, reducer backlash, and elastic deformation of the transmission chain can cause the actual rotation angle of the moving contact to deviate from the theoretical 180°, resulting in alignment deviation as well. Furthermore, after the three-phase moving contacts rotate as a whole with the shaft, the spatial positions of phases A, B, and C are interchanged. If the downstream load is sensitive to phase sequence, manual or additional phase-changing devices must be used to readjust the phases after switching, increasing operational steps and the risk of misoperation. Summary of the Invention

[0004] The purpose of this invention is to provide an indoor metal-clad withdrawable switchgear based on dual power supply, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an indoor metal-clad withdrawable switchgear based on dual-power supply, comprising: a switchgear body, wherein two sets of contact seats are disposed within the switchgear body; a trolley, disposed within the switchgear body, wherein a rotatable movable contact is disposed on the trolley; a second gear, coaxial with the rotating shaft of the movable contact, wherein the second gear and the rotating shaft of the movable contact are connected by a clearance structure, the clearance structure being able to drive the movable contact to rotate when the second gear rotates at a predetermined angle; and a drive structure, disposed on the trolley, wherein the drive... The structure connects to the second gear, and the drive structure is provided with a guide portion; a rotary connection structure connects to the rotating shaft of the moving contact, the end of the rotary connection structure away from the rotating shaft of the moving contact is sleeved on the drive structure, and the rotary connection structure is provided with a fitting shaft inside, the fitting shaft cooperates with the guide portion, and can drive the moving contact away from the contact seat when the moving contact rotates; a locking structure connects to the rotating shaft of the moving contact, the locking structure can unlock when the moving contact moves away from the contact seat, and lock again when the moving contact rotates 180°.

[0006] As described above, the indoor metal-clad withdrawable switchgear based on dual power supply has the following features: a connecting sleeve is detachably installed on the trolley, a connecting shaft is slidably disposed within the connecting sleeve, and the connecting shaft is connected to the moving contact via a connecting frame; a connecting ring is disposed on the connecting shaft, and the connecting ring is connected to a cylindrical spring disposed within the connecting sleeve; a damping washer is disposed at the slidable connection between the connecting sleeve and the connecting shaft; and the second gear is coaxially disposed with the connecting shaft.

[0007] As described above, the indoor metal-clad withdrawable switchgear based on dual power supply includes an arc-shaped portion disposed on the connecting shaft and an arc-shaped groove disposed inside the second gear. The arc-shaped portion is capable of sliding within the arc-shaped groove. The central angle of the arc-shaped portion is smaller than the central angle of the arc-shaped groove.

[0008] The indoor metal-clad withdrawable switchgear based on dual power supply as described above: the drive structure includes a drive device fixedly mounted on the handcart, a first gear connected to the output shaft of the drive device, the first gear meshing with a second gear, and the axial thickness of the second gear being greater than the axial thickness of the first gear; the end of the output shaft of the drive device is provided with the guide portion.

[0009] As described above, the indoor metal-clad withdrawable switchgear based on dual power supply: the guide part includes a first arc surface and a second arc surface disposed on the output shaft of the drive device, the first arc surface and the second arc surface are parallel; the first arc surface and the second arc surface are connected at their beginning and end by a set of guide surfaces, and when the fitting shaft moves from the first arc surface along the guide surface, the moving contact can move away from the contact seat.

[0010] The indoor metal-clad withdrawable switchgear based on dual power supply as described above: the rotary connection structure includes an annular connecting part disposed on the connecting shaft, a double-headed connector is rotatably installed in the annular connecting part, and one end of the double-headed connector away from the annular connecting part is slidably fitted with the output shaft of the drive device; the fitting shaft is disposed on the double-headed connector.

[0011] The indoor metal-clad withdrawable switchgear based on dual power supply as described above: the locking structure includes a locking member fixedly installed on the handcart and coaxial with the connecting shaft, and the inner side of the locking member is provided with two sets of locking grooves; the locking structure also includes a follower rotating member fixedly connected coaxially with the connecting shaft, and the follower rotating member is provided with two sets of convex shafts adapted to the locking grooves.

[0012] The indoor metal-clad withdrawable switchgear based on dual power supply as described above further includes: connecting wires, three sets of which are electrically connected to the moving contact, the connecting wires passing through the connecting shaft and extending to the end of the connecting shaft; and a telescopic connector electrically connected to the trolley, the telescopic connector being connected to the connecting wires via a ring connection structure.

[0013] The indoor metal-clad withdrawable switchgear based on dual power supply as described above: the annular connection structure includes two sets of conductive electrodes disposed on the telescopic connector and conductive parts connected to two sets of connecting wires. The conductive parts are rotatably fitted with the conductive electrodes, and locking rings are sleeved on the outside of the two sets of conductive parts.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: Firstly, the support of the second gear by the first gear on the second gear ensures the horizontality of the connecting shaft, preventing it from tilting downwards due to torque, which would cause the moving contact to change position after rotation and fail to insert into the corresponding contact seat. Secondly, during the operation of the connecting shaft, it can be unlocked first and then locked after rotation, ensuring the axial accuracy of the connecting shaft before and after repositioning, thus enabling the moving contact to be accurately inserted into the corresponding contact seat and ensuring stable switching of the power supply line. Thirdly, the connecting wire, telescopic connector, and ring connection structure allow the phase sequence of the moving contact to automatically switch before and after switching, ensuring that the phase sequence before and after switching is consistent, eliminating the need to adjust the phase sequence after switching the power supply circuit and reducing the difficulty of using and operating the distribution cabinet. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of an indoor metal-clad withdrawable switchgear based on dual power supply. Figure 2 This is a schematic diagram of the structure of an indoor metal-clad withdrawable switchgear with dual power supply after the main body of the distribution cabinet has been removed. Figure 3 This is a schematic diagram of the moving contact and contact seat in an indoor metal-clad withdrawable switchgear based on dual power supply. Figure 4 This is a schematic diagram of the second gear, drive structure, and rotary connection structure in an indoor metal-clad withdrawable switchgear based on dual power supply. Figure 5 An exploded view of the second gear, drive structure, and rotary connection structure in an indoor metal-clad withdrawable switchgear based on dual power supply. Figure 6 An exploded view of the double-ended connector and drive structure in an indoor metal-clad withdrawable switchgear based on dual power supply. Figure 7 This is a schematic diagram of the drive structure in an indoor metal-clad withdrawable switchgear based on dual power supply. Figure 8 This is a top view of the moving contact, connecting frame, connecting shaft, and second gear in an indoor metal-clad withdrawable switchgear based on dual power supply. Figure 9 for Figure 8 Cross-sectional view at point AA; Figure 10 This is a schematic diagram of the locking mechanism in an indoor metal-clad withdrawable switchgear based on dual power supply. Figure 11This is a schematic diagram of the connecting shaft and connecting sleeve in an indoor metal-clad withdrawable switchgear based on dual power supply. Figure 12 This is a schematic diagram of the internal structure of the connecting sleeve in an indoor metal-clad withdrawable switchgear based on dual power supply. Figure 13 This is an exploded view of the telescopic connector and conductive parts in an indoor metal-clad withdrawable switchgear based on dual power supply.

[0016] In the diagram: 1. Switchgear body; 2. Handcart; 3. Contact seat; 4. Moving contact; 5. Connecting frame; 6. Connecting shaft; 601. Arc-shaped part; 602. Connecting ring; 603. Annular connecting part; 7. Drive device; 701. First arc surface; 702. Guide surface; 703. Second arc surface; 8. First gear; 9. Second gear; 901. Arc groove; 10. Follower rotating part; 1001. Protruding shaft; 11. Double-headed connector; 1101. Fitting shaft; 12. Locking part; 1201. Locking groove; 13. Connecting sleeve; 14. Cylindrical spring; 15. Telescopic connector; 1501. Conducting electrode; 16. Locking ring; 17. Damping washer; 18. Connecting wire; 1801. Conductive part. Detailed Implementation

[0017] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0018] Please see Figures 1-13 As an embodiment of the present invention, the indoor metal-clad withdrawable switchgear based on dual power supply includes: switchgear body 1, handcart 2, second gear 9, drive structure, rotary connection structure and locking structure.

[0019] The switch cabinet body 1 is provided with two sets of contact seats 3; the handcart 2 is provided in the switch cabinet body 1, and the handcart 2 is provided with a rotatable moving contact 4. Specifically, the handcart 2 is detachably installed with a connecting sleeve 13, and a connecting shaft 6 is slidably provided in the connecting sleeve 13. The connecting shaft 6 is connected to the moving contact 4 through a connecting bracket 5; a connecting ring 602 is provided on the connecting shaft 6, and the connecting ring 602 is connected to a cylindrical spring 14 provided in the connecting sleeve 13; a damping washer 17 is provided at the sliding connection between the connecting sleeve 13 and the connecting shaft 6.

[0020] In this embodiment, when the handcart 2 is pushed into the switch cabinet body 1, the connecting shaft 6 can rotate to make the moving contact 4 alternately connect with the two sets of contact seats 3, thereby realizing the switching of the line and achieving the effect of stable power supply to the two sets of loads. Compared with the existing technology of using two switch cabinets for control, it effectively reduces the number of switch cabinets used and the space occupied.

[0021] Please see Figure 9 , Figure 11 The second gear 9 is coaxial with the moving connecting shaft 6. The second gear 9 is connected to the rotating shaft of the moving contact 4 through a clearance structure. The clearance structure can drive the moving contact 4 to rotate when the second gear 9 rotates a predetermined angle. The clearance structure includes an arc-shaped portion 601 provided on the connecting shaft 6 and an arc-shaped groove 901 provided inside the second gear 9. The arc-shaped portion 601 can slide in the arc-shaped groove 901. The central angle of the arc-shaped portion 601 is smaller than the central angle of the arc-shaped groove 901.

[0022] In this embodiment, the main function of the yielding structure is that, since the driving structure is always connected to the second gear 9, and the locking structure is in a locked state in the initial state, when the driving structure moves and cooperates with the rotating connecting structure to move the moving contact 4 away from the contact seat 3 to unlock the locking structure, the second gear 9 is also rotating. At this time, under the action of the yielding structure, the connecting shaft 6 will not rotate with the second gear 9 and can maintain an axially stationary state under the action of the damping washer 17. When the locking structure is unlocked, the yielding structure allows the connecting shaft 6 to overcome the resistance of the damping washer 17 and rotate with the second gear 9, thereby realizing the rotation of the moving contact 4. Specifically, in the initial state, the arc-shaped part 601 and the arc-shaped groove 901 abut against the side of the connecting shaft 6 that rotates (see reference). Figure 9 When the drive structure operates, it can drive the second gear 9 to rotate counterclockwise, causing the arc groove 901 to slide relative to the arc part 601. During this process, the drive structure can cooperate with the rotary connection structure to make the moving contact 4 move away from the contact seat 3. When the moving contact 4 is completely separated from the contact seat 3, the arc part 601 abuts against the other side of the arc groove 901. At this time, the second gear 9 can drive the connecting shaft 6 to overcome the resistance of the damping washer 17 and force rotation, thereby realizing the replacement of the moving contact 4.

[0023] Based on the above settings, the connecting shaft 6 can be kept stationary when the drive structure is in motion, thus avoiding interference and locking.

[0024] Please see Figures 5-7The drive structure is mounted on the handcart 2, and is connected to the second gear 9. The drive structure is also provided with a guide. The drive structure includes a drive device 7 fixedly mounted on the handcart 2. A first gear 8 is connected to the output shaft of the drive device 7. The first gear 8 meshes with the second gear 9, and the axial thickness of the second gear 9 is greater than that of the first gear 8. This ensures that when the drive device 7 operates and cooperates with the rotary connection structure to drive the moving contact 4 away from the contact seat 3, although the second gear 9 will have an axial displacement relative to the first gear 8, the two will always be in a meshing state. This ensures the continuity of power transmission and prevents the first gear 8 and the second gear 9 from separating, which would prevent the moving contact 4 from being driven into position.

[0025] The guide portion is provided at the end of the output shaft of the drive device 7. The guide portion includes a first arc surface 701 and a second arc surface 703 disposed on the output shaft of the drive device 7. The first arc surface 701 and the second arc surface 703 are parallel. The first arc surface 701 and the second arc surface 703 are connected at their ends by a set of guide surfaces 702. When the fitting shaft 1101 moves from the first arc surface 701 along the guide surface 702, the moving contact 4 can move away from the contact seat 3.

[0026] It should be noted that the aforementioned drive device 7 is located directly below the connecting shaft 6, and the first gear 8 is in a meshing state with the second gear 9. In this state, the first gear 8 provides a certain support to the second gear 9, which can be transmitted to the connecting shaft 6 to ensure the horizontality of the connecting shaft 6. This prevents the connecting shaft 6 from generating a downward torque under the gravity of the moving contact 4 and the connecting frame 5, which would cause the connecting shaft 6 to tilt downward, resulting in the moving contact 4 changing position after the connecting shaft 6 rotates, and thus failing to be inserted into the corresponding contact seat 3.

[0027] The rotary connection structure connects to the rotating shaft of the moving contact 4. One end of the rotary connection structure away from the rotating shaft of the moving contact 4 is sleeved on the driving structure. The rotary connection structure has a fitting shaft 1101 inside. The fitting shaft 1101 cooperates with the guide part and can drive the moving contact 4 away from the contact seat 3 when the moving contact 4 rotates. The rotary connection structure includes an annular connecting part 603 disposed on the connecting shaft 6. A double-headed connector 11 is rotatably installed in the annular connecting part 603. One end of the double-headed connector 11 away from the annular connecting part 603 is slidably fitted with the output shaft of the driving device 7. The fitting shaft 1101 is disposed on the double-headed connector 11.

[0028] In this embodiment, when the drive device 7 is working, the output shaft of the drive device 7 will rotate, causing the guide part to rotate. Specifically, in the initial state, the fitting shaft 1101 is in contact with the first arc surface 701, and the column spring 14 is in a compressed state. When the guide part rotates, the fitting shaft 1101 can switch from the first arc surface 701 to the second arc surface 703 via the guide surface 702. At this time, the column spring 14 will be further compressed, and the double-headed connector 11 will drive the connecting shaft 6 and the moving contact 4 to move away from the contact seat 3, and completely separate the moving contact 4 from the contact seat 3 to prevent the moving contact 4 from rotating directly and causing interference when the moving contact 4 is not separated from the contact seat 3.

[0029] During the separation of the moving contact 4 from the contact seat 3, the locking structure will also unlock. At this time, the connecting shaft 6 can remain stationary under the resistance provided by the damping washer 17. Then, the arc-shaped part 601 abuts against the side wall of the arc-shaped groove 901, so that when the driving device 7 continues to rotate, the first gear 8 can drive the connecting shaft 6 to rotate through the second gear 9. In this state, the fitting shaft 1101 can roll on the second arc surface 703 and keep the moving contact 4 separated from the contact seat 3. When the fitting shaft 1101 moves towards the first arc surface 701 through another guide surface 702, the locking structure is still in the unlocked state. When the connecting frame 5 rotates accurately 180°, the locking structure locks again. At the same time, the columnar spring 14 pushes the connecting shaft 6 to move, so that the moving contact 4 is inserted into another set of contact seats 3, realizing the position switching of the moving contact 4 and its precise insertion into the contact seat 3.

[0030] Please see Figures 2-4 , Figure 10 The locking structure is connected to the rotating shaft of the moving contact 4. The locking structure can unlock when the moving contact 4 moves away from the contact seat 3 and lock again when the moving contact 4 rotates 180°. The locking structure includes a locking member 12 fixedly installed on the handcart 2 and coaxial with the connecting shaft 6. The inner side of the locking member 12 is provided with two sets of locking grooves 1201. The locking structure also includes a follower rotating member 10 fixedly connected to the connecting shaft 6 on the same axis. The follower rotating member 10 is provided with two sets of convex shafts 1001 that are adapted to the locking grooves 1201.

[0031] In this embodiment, in the initial state, the convex shaft 1001 is located within the locking groove 1201, which locks the connecting shaft 6, thus improving the connection stability between the moving contact 4 and the contact seat 3 to a certain extent. When the driving device 7 is working, the moving contact 4 can separate from the contact seat 3. During this process, the convex shaft 1001 also moves relative to the locking groove 1201. After the moving contact 4 and the contact seat 3 are completely separated, the convex shaft 1001 separates from the locking groove 1201. At this time, the fitting shaft 1101 moves into the second arc surface 703, allowing the convex shaft 1001 to remain separated from the locking groove 1201. When the connecting shaft 6 rotates... When rotated to a certain angle, although the engaging shaft 1101 will separate from the second arc surface 703, the convex shaft 1001 will abut against the side of the locking member 12, so that the moving contact 4 and the contact seat 3 remain separated until the connecting shaft 6 rotates 180°, at which point the convex shaft 1001 can engage with another locking groove 1201. At this time, under the action of the column spring 14, the connecting shaft 6 pushes the moving contact 4 to move, and at the same time the convex shaft 1001 moves along the length direction of the locking groove 1201, thereby achieving circumferential locking of the connecting shaft 6, ensuring the accuracy of the rotation angle of the connecting shaft 6, so that the moving contact 4 can be accurately inserted into the corresponding contact seat 3.

[0032] It should be noted that the locking groove 1201 is a "Y" shaped structure, so that when the convex shaft 1001 moves toward the locking groove 1201, it can guide the convex shaft 1001 and ensure that the convex shaft 1001 can be accurately inserted into the locking groove 1201.

[0033] Based on the above configuration, firstly, the support of the first gear 8 on the second gear 9 ensures the horizontality of the connecting shaft 6, preventing the connecting shaft 6 from tilting downwards due to torque, which would cause the moving contact 4 to change position after rotation and fail to insert into the corresponding contact seat 3. Secondly, during the operation of the connecting shaft 6, it can be unlocked first, and then locked again after rotating 180°, ensuring the axial accuracy of the connecting shaft 6 before and after repositioning, so that the moving contact 4 can be accurately inserted into the corresponding contact seat 3, ensuring the stable switching of the power supply line.

[0034] Please see Figures 11-13 The indoor metal-clad withdrawable switchgear based on dual power supply also includes: connecting wire 18 and telescopic connector 15.

[0035] The connecting wires 18 are provided in three sets and electrically connected to the moving contact 4. The connecting wires 18 pass through the connecting shaft 6 and extend to the end of the connecting shaft 6. The telescopic connector 15 is electrically connected to the handcart 2. The telescopic connector 15 and the connecting wires 18 are connected by a ring connection structure. The ring connection structure includes two sets of conductive electrodes 1501 provided on the telescopic connector 15 and conductive parts 1801 connected to two of the sets of connecting wires 18. The conductive parts 1801 are rotatably fitted with the conductive electrodes 1501, and locking rings 16 are sleeved on the outside of the two sets of conductive parts 1801.

[0036] In this embodiment, three sets of moving contacts 4 are provided, corresponding to phases A, B, and C respectively. The three sets of moving contacts 4 can be connected to three sets of connecting wires 18 respectively. The conductive parts 1801 connected to the connecting wires 18 of phases A and C are initially connected to two sets of conductive electrodes 1501 respectively. Phase B is directly electrically connected to the telescopic connector 15. When the connecting shaft 6 rotates 180°, the corresponding two sets of conductive parts 1801 can rotate and switch with the two sets of conductive electrodes 1501. At this time, although the connecting shaft 6 drives the moving contacts 4 to rotate 180°, the positions of the two sets of conductive parts 1801 and the two sets of conductive electrodes 1501 are switched, so that the phase sequence before the switch is consistent with the phase sequence after the switch. Therefore, it is not necessary to adjust the phase sequence after switching the power supply circuit, which reduces the difficulty of using and operating the distribution cabinet.

[0037] Based on the above settings, the phase sequence corresponding to the moving contact 4 can be automatically switched before and after switching, that is, the phase sequence before switching is consistent with the phase sequence after switching, so that there is no need to adjust the phase sequence after switching the power supply circuit, which reduces the difficulty of using and operating the distribution cabinet.

[0038] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0039] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An indoor metal-clad withdrawable switchgear based on dual power supply, comprising: The switch cabinet body is internally provided with two groups of contact seat; The handcart is provided in the switch cabinet body, and the movable contact capable of rotating is arranged on the handcart; characterized in that further comprising: a second gear coaxial with the rotating shaft of the movable contact, the second gear and the rotating shaft of the movable contact are connected through a let-out structure, the let-out structure can drive the movable contact to rotate when the second gear rotates by a predetermined angle; a driving structure is arranged on the handcart, the driving structure is connected with the second gear, and a guide part is arranged on the driving structure; a rotating connection structure is connected with the rotating shaft of the movable contact, one end of the rotating connection structure away from the rotating shaft of the movable contact is sleeved on the driving structure, and a fitting shaft is arranged in the rotating connection structure, the fitting shaft is matched with the guide part, and the movable contact can move away from the contact seat when the movable contact rotates; a locking structure is connected with the rotating shaft of the movable contact, the locking structure can be unlocked when the movable contact moves away from the contact seat, and the locking structure is locked again when the movable contact rotates by 180 degrees.

2. The dual power supply based indoor metal-clad draw-out switchgear as claimed in claim 1, wherein, A connecting sleeve is detachably mounted on the handcart, a connecting shaft is slidably arranged in the connecting sleeve, and the connecting shaft is connected with the movable contact through a connecting frame; a connecting ring is arranged on the connecting shaft, and the connecting ring is connected with a cylindrical spring arranged in the connecting sleeve; a damping washer is arranged at the sliding connection position of the connecting sleeve and the connecting shaft; the second gear is coaxially arranged with the connecting shaft.

3. The dual power supply based indoor metal-clad draw-out switchgear according to claim 2, characterized in that, The let-out structure comprises an arc-shaped part arranged on the connecting shaft and an arc-shaped groove arranged in the second gear, and the arc-shaped part can slide in the arc-shaped groove; the central angle of the arc-shaped part is smaller than the central angle of the arc-shaped groove.

4. The dual power supply based indoor metal-clad draw-out switchgear as claimed in claim 2, wherein, The driving structure comprises a driving device fixedly mounted on the handcart, a first gear is connected with the output shaft of the driving device, the first gear is engaged with the second gear, and the axial thickness of the second gear is greater than the axial thickness of the first gear; the end of the output shaft of the driving device is provided with the guide part.

5. The dual power supply based indoor metal-clad draw-out switchgear as claimed in claim 4, wherein, The guide part comprises a first circular arc surface and a second circular arc surface arranged on the output shaft of the driving device, and the first circular arc surface is parallel to the second circular arc surface; the first circular arc surface and the second circular arc surface are connected through a group of guide surfaces at the head and tail respectively, and when the fitting shaft moves along the guide surface from the first circular arc surface, the movable contact can move away from the contact seat.

6. The dual power supply based indoor metal-clad draw-out switchgear as claimed in claim 4, wherein, The rotating connection structure comprises an annular connecting part arranged on the connecting shaft, a double-headed connecting piece is rotatably mounted in the annular connecting part, one end of the double-headed connecting piece away from the annular connecting part is slidably sleeved with the output shaft of the driving device; the fitting shaft is arranged on the double-headed connecting piece.

7. The dual power supply based indoor metal-clad draw-out switchgear as claimed in claim 2, wherein, The locking structure comprises a locking piece fixedly mounted on the handcart and coaxial with the connecting shaft, and the inner side of the locking piece is provided with two groups of locking grooves; the locking structure further comprises a follow-up rotating piece fixedly connected with the connecting shaft and coaxial with the connecting shaft, and the follow-up rotating piece is provided with two groups of convex shafts matched with the locking grooves.

8. The dual power supply based indoor metal-clad draw-out switchgear as claimed in claim 2, wherein, Further comprising: The connecting wires are provided in three sets and electrically connected to the moving contact. The connecting wires pass through the connecting shaft and extend to the end of the connecting shaft. The telescopic connector is electrically connected to the handcart, and the telescopic connector is connected to the connecting wires through a ring connection structure.

9. The dual power supply based indoor metal-clad draw-out switchgear according to claim 8, characterized in that, The ring connection structure includes two sets of conductive electrodes disposed on the telescopic connector and conductive parts connected to two sets of connecting wires. The conductive parts are rotatably fitted with the conductive electrodes, and locking rings are sleeved on the outside of the two sets of conductive parts.

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