A ring main unit locking device

Abstract

The application relates to the field of ring network cabinets, in particular to a ring network cabinet locking device, which comprises a shell fixedly installed on a cabinet door of a ring network cabinet and a fixing frame fixedly installed on a cabinet body of the ring network cabinet, a lock box is fixedly arranged at the tail end of the shell, the lock box is located between the upper and lower two fixing frames and is blocked by the fixing frames, a control rod and a driving rod are coaxially arranged in the shell, the control rod is axially slidably installed in the shell, the driving rod is rotatably installed in the shell, lock core rods are movably arranged at the upper and lower ends in the lock box, interlocking plates are arranged at the upper and lower ends of the side wall of the lock box, lock holes are arranged through the interlocking plates, and a first clamping lock and a second clamping lock are arranged on the fixing frame. When the lock is opened, the application can automatically cut off the power to form circuit protection, greatly improving the operation safety, and when the lock is closed, the application can automatically supply power to ensure the normal operation of the ring network cabinet, so that the locking device is stable and reliable.

Description

Technical Field

[0001] This invention relates to the field of ring main unit technology, and in particular to a ring main unit locking device. Background Technology

[0002] A ring main unit is a combination of high-voltage switchgear used in a ring power distribution network. Its core components are load switches and fuses. By encapsulating the power transmission and distribution equipment in a metal or non-metal insulating cabinet, its core function is to realize power distribution and line protection through a ring power supply network. It features compact structure, low cost, and high power supply reliability, and is widely used in power distribution systems in urban residential areas, factories, and other load centers.

[0003] The safety interlock of the ring main unit is the core guarantee to prevent live operation. The existing ring main unit interlock structure requires maintenance after manual safety grounding and power disconnection. The staff needs to control the power supply of the ring main unit and the opening and closing mechanism, which is troublesome and poses certain electrical safety hazards. Summary of the Invention

[0004] The purpose of this invention is to provide a ring main unit locking device to solve the above-mentioned technical problems.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A ring main unit locking device includes a housing fixedly installed on the ring main unit door and a fixing frame fixedly installed on the ring main unit body. A lock box is fixedly provided at the tail end of the housing. The lock box is located between two sets of fixing frames and is adapted and blocked by the fixing frames. A control rod and a drive rod are coaxially arranged inside the housing. The control rod is axially slidably installed in the housing, and the drive rod is rotatably installed in the housing. Lock cylinder rods are movably installed at the upper and lower ends of the lock box. Interlocking plates are extended from the upper and lower ends of the side wall of the lock box. Lock holes are provided through the interlocking plates. A first locking latch and a second locking latch are respectively provided on the fixing frame. Pressing the control rod makes it form a self-locking engagement with the drive rod. The control rod drives the drive rod to rotate to realize the power on and off control of the ring main unit. The rotation of the control rod and the drive rod also causes the first locking latch to lock or unlock the lock cylinder rod, and at the same time causes the second locking latch to lock or unlock the lock hole.

[0007] As a further aspect of the present invention: a limiting rod sleeve is fitted on the outer wall of the control rod, the limiting rod sleeve is rotatably installed in the housing and forms a limiting sliding fit with the control rod, and a pressing spring is provided between one side of the limiting rod sleeve and the control rod.

[0008] As a further aspect of the present invention: the first end of the control lever is provided with a slot for inserting a key, the end of the control lever is provided with a clearance groove for the control lever to move, a radial locking block is circumferentially and evenly slidably installed on the inner wall of the clearance groove, and a compression spring is provided between the tail end of the radial locking block and the control lever.

[0009] As a further embodiment of the present invention: the drive rod is rotatably mounted in the housing via an annular protrusion, and a sloping push head is fixedly connected to one end of the drive rod near the control rod. The radial block is arc-shaped at one end near the sloping push head, and a locking hole adapted to the radial block is provided on the outer wall of the drive rod.

[0010] As a further aspect of the present invention: a movable rod sleeve is slidably sleeved on the outer wall of the drive rod, and an inclined step portion is provided at one end of the movable rod sleeve near the inclined push head. The inclined step portion is inclined in the opposite direction to the inclined surface of the inclined push head, and the inclined step portion matches the end face of the inclined push head. A tension spring is provided between the end of the movable rod sleeve away from the inclined push head and the housing, and the movable rod sleeve moves away from the inclined push head under the tension of the tension spring.

[0011] As a further embodiment of the present invention: a set of L-shaped toothed plates are symmetrically arranged in the center of the lock box. The L-shaped toothed plates are slidably installed on the inner side wall of the lock box. The lock cylinder rod is fixedly installed on the top of the corresponding L-shaped toothed plate. A drive tooth is fixedly sleeved on the drive rod. The two sides of the drive tooth mesh with the L-shaped toothed plate.

[0012] As a further aspect of the present invention: the first locking mechanism includes a sleeve, which is fixedly mounted on a mounting bracket. The bottom end of the sleeve has a through hole for the lock cylinder rod to pass through. The top end of the sleeve has a sliding rod, which has an energized contact block fixedly mounted on the top end of the rod. The bottom end of the rod has a top plate fixedly mounted on the top end of the rod. A top spring is provided between the upper end of the top plate and the sleeve.

[0013] As a further aspect of the present invention: a radially sliding ball is provided on the inner wall of the sleeve, a push spring is provided between the tail end of the ball and the sleeve, a limiting hole is provided on the outer wall of the top plate to engage with the ball, and a positioning hole is provided on the outer wall of the lock cylinder rod to engage with the ball.

[0014] As a further embodiment of the present invention: one side of the fixing frame is fixedly installed on the ring main unit cabinet by a mounting side plate, and an energized contact plate is fixedly provided at the upper end of the fixing frame. The bottom of the energized contact plate has a contact point that passes through the fixing frame, and the contact point is located directly above the energized contact block.

[0015] As a further aspect of the present invention: the second lock includes a lock housing, which is fixedly mounted on a mounting frame. A metal plate is movably mounted inside the lock housing. Both ends of the metal plate are slidably mounted on a sliding rod. A lock cylinder block adapted to the lock hole is fixedly provided at the bottom of the metal plate. A return spring is provided between the bottom end of the metal plate and the mounting frame. An electromagnetic coil is fixedly mounted at the bottom inside the lock housing. The electromagnetic coil achieves power-on / off control through the contact or separation of the energized contact block and the energized contact plate.

[0016] The beneficial effects of this invention are:

[0017] (1) Through the press-lock structure formed by the control rod and the drive rod, the staff needs to press the rod during the unlocking and locking process, and can get clear status feedback through touch and sound, so that the staff can clearly understand the current operation process and avoid accidental operation. At the same time, the power can be automatically cut off when unlocking to form circuit protection, which greatly improves the operation safety. When locking, the power can be automatically turned on to ensure the normal operation of the ring network cabinet, making the locking device stable and reliable.

[0018] (2) By setting the first and second locking mechanisms, when locking, the lock cylinder rod extends into the corresponding sleeve, and the energized contact block contacts the contact point at the bottom of the energized contact plate, thereby realizing the automatic energization of the ring main unit. At the same time, the rolling ball will be inserted into the positioning hole of the lock cylinder rod, thereby limiting and locking the lock cylinder rod to keep its position fixed. The electromagnetic coil will also be energized to generate magnetism, and the metal plate will move downward under the magnetic attraction, and drive the lock cylinder block to engage with the lock hole. In the locking process, while realizing automatic energization, the two sets of locking mechanisms will also realize double mechanical locking, which effectively improves the locking reliability of the ring main unit. Attached Figure Description

[0019] The invention will now be further described with reference to the accompanying drawings.

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0021] Figure 2 This is a schematic diagram of the full cross-section of the present invention.

[0022] Figure 3 This is a schematic diagram of the internal structure of the shell in this invention.

[0023] Figure 4 This is a schematic diagram of the control lever in this invention.

[0024] Figure 5 This is a schematic diagram of the internal structure of the control lever in this invention.

[0025] Figure 6 This is a schematic diagram of the drive rod in this invention.

[0026] Figure 7 This is a schematic diagram of the lock box structure in this invention.

[0027] Figure 8 yes Figure 7 A magnified schematic diagram of the structure at point A in the middle.

[0028] Figure 9 This is a schematic diagram of the top rod and top plate in this invention.

[0029] Figure 10 This is a schematic diagram of the structure of the second locking mechanism in this invention.

[0030] Figure 11 This is a schematic diagram of the internal structure of the lock shell in this invention.

[0031] In the diagram: 1. Housing; 2. Lock box; 201. L-shaped toothed plate; 202. Lock cylinder rod; 2021. Positioning hole; 203. Interlocking plate; 204. Lock hole; 3. Fixing bracket; 301. Mounting side plate; 302. Power contact plate; 4. Control rod; 401. Limit rod sleeve; 402. Pressing spring; 403. Slot; 404. Clearance groove; 405. Radial locking block; 4051. Compression spring; 5. Drive rod; 501. Angled push head; 502. 503. Snap hole; 5031. Movable rod sleeve; 5032. Sloping stepped section; 5033. Tension spring; 504. Drive tooth; 6. First locking; 601. Snap sleeve; 602. Top rod; 603. Power contact block; 604. Top plate; 6041. Limiting hole; 605. Top spring; 606. Rolling ball; 607. Push spring; 7. Second locking; 701. Lock shell; 702. Metal plate; 703. Electromagnetic coil; 704. Lock cylinder block; 705. Return spring. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Please see Figures 1-3As shown, this invention is a locking device for a ring main unit, comprising a housing 1 fixedly installed on the door of the ring main unit and a fixing frame 3 fixedly installed on the cabinet body of the ring main unit. A lock box 2 is fixedly provided at the tail end of the housing 1. The lock box 2 is located between two sets of fixing frames 3 and is adapted and blocked by the fixing frames 3. A control rod 4 and a drive rod 5 are coaxially arranged inside the housing 1. The control rod 4 is axially slidably installed inside the housing 1, and the drive rod 5 is rotatably installed inside the housing 1. Lock cylinder rods 202 are movably installed at the upper and lower ends inside the lock box 2. Interlocking plates 203 are extended from the upper and lower ends of the side wall. Lock holes 204 are provided through the interlocking plates 203. A first locking 6 and a second locking 7 are respectively provided on the fixing frame 3. Pressing the control rod 4 makes it form a self-locking engagement with the drive rod 5. The control rod 4 drives the drive rod 5 to rotate to realize the power on and off control of the ring main unit. The rotation of the control rod 4 and the drive rod 5 will also cause the first locking 6 to lock or unlock the lock cylinder rod 202, and at the same time, it will cause the second locking 7 to lock or unlock the lock hole 204.

[0034] Specifically, by setting up control lever 4 and drive lever 5, when unlocking the ring main unit, pressing control lever 4 causes it to form a self-locking engagement with drive lever 5. At this time, control lever 4 can drive drive lever 5 to rotate. When drive lever 5 rotates, it automatically de-energizes the ring main unit. At the same time, the first locking latch 6 and the lock cylinder, as well as the second locking latch 7 and the lock hole 204, unlock simultaneously. When locking the ring main unit, control lever 4 again controls drive lever 5 to rotate in the opposite direction, which can realize the automatic power-on of the ring main unit and ensure that the first locking latch 6 and the second locking latch 7 are locked. Then, press control lever 4 again to disengage it from drive lever 5, completing the entire locking process. Through the press-locking structure formed by the control lever 4 and the drive lever 5, the operator needs to press the lever during both the unlocking and locking processes. The operator can receive clear status feedback through touch and sound, allowing the operator to clearly understand the current operation process and avoid accidental operation. At the same time, the device can automatically cut off the power during unlocking to form circuit protection, which greatly improves the safety of operation. During locking, the device can automatically turn on the power to ensure the normal operation of the ring main unit, making the locking device stable and reliable.

[0035] like Figures 3-4 As shown, a limiting rod sleeve 401 is fitted on the outer wall of the control rod 4. The limiting rod sleeve 401 is rotatably installed in the housing 1 and forms a limiting sliding fit with the control rod 4. A pressing spring 402 is provided between one side of the limiting rod sleeve 401 and the control rod 4.

[0036] Specifically, by setting a limiting sleeve 401, since the limiting sleeve 401 and the control rod 4 form a limiting sliding fit, the control rod 4 can only slide axially relative to the limiting sleeve 401. When the control rod 4 is pressed, causing the pressing spring 402 to compress and deform, it can limit and guide the control rod 4. At the same time, when the control rod 4 and the drive rod 5 form a self-locking mechanism, the control rod 4 can rotate synchronously with the limiting sleeve 401, thereby driving the drive rod 5 to rotate.

[0037] like Figures 5-6 As shown, the control lever 4 has a slot 403 for inserting a key at its front end and a clearance groove 404 for moving the control lever 4 at its rear end. A radial locking block 405 is circumferentially and evenly slidably installed on the inner wall of the clearance groove 404. A compression spring 4051 is provided between the rear end of the radial locking block 405 and the control lever 4.

[0038] Furthermore, the drive rod 5 is rotatably mounted inside the housing 1 via an annular protrusion. An inclined push head 501 is fixedly connected to one end of the drive rod 5 near the control rod 4. The radial locking block 405 is arc-shaped at one end near the inclined push head 501. A locking hole 502 adapted to the radial locking block 405 is provided on the outer wall of the drive rod 5.

[0039] Specifically, after the key is inserted into the slot 403, the control lever 4 is pressed and slid inward until the inclined push head 501 enters the clearance slot 404 and contacts the radial locking block 405. Since one side of the radial locking block 405 is arc-shaped, the inclined push head 501 will push the radial locking block 405 back inward until the inclined push head 501 has completely passed the radial locking block 405. At this time, the radial locking block 405 will be smoothly locked into the corresponding locking hole 502 under the action of the compression spring 4051, and make a clear "click" sound. The staff can clearly judge that the control lever 4 and the drive lever 5 have been locked by sound and touch, and stop pressing the control lever 4 and start rotating the control lever 4. At this time, the control lever 4 can drive the drive lever 5 to start rotating synchronously.

[0040] like Figures 5-6 As shown, a movable rod sleeve 503 is slidably sleeved on the outer wall of the drive rod 5. An inclined step portion 5031 is provided at one end of the movable rod sleeve 503 near the inclined push head 501. The inclined step portion 5031 is in the opposite direction to the inclined surface of the inclined push head 501, and the inclined step portion 5031 matches the end face of the inclined push head 501. A tension spring 5032 is provided between the end of the movable rod sleeve 503 away from the inclined push head 501 and the housing 1. The movable rod sleeve 503 moves away from the inclined push head 501 under the tension of the tension spring 5032.

[0041] Specifically, in its natural state, the inclined stepped portion 5031 rests against the inner wall of the housing 1 under the action of the tension spring 5032, maintaining a certain distance from the inclined push head 501. When locking is completed and the key needs to be removed, the control rod 4 is pressed inward again to slide inward. At this time, the radial locking block 405 will slide along the surface of the drive rod 5 until it contacts and presses against the inclined stepped portion 5031. Then, the radial locking block 405 retracts inward and finally abuts against the outer wall of the movable rod sleeve 503 after passing the inclined stepped portion 5031. At this time, the control rod 4 is pulled outward, and the radial locking block 405 will lock the steps of the inclined stepped portion 5031. The inclined step portion 5031 slides outward synchronously, and the tension spring 5032 begins to stretch and deform until the inclined step portion 5031 and the end face of the inclined push head 501 are closed. At this time, the control lever 4 is no longer pressed and is released. The control lever 4 will move in the opposite direction under the elastic force of the pressing spring 402. At this time, the radial block 405 will slide through the inclined step portion 5031 and the inclined push head 501. The inclined step portion 5031 is no longer limited by the radial block 405 and returns to its original position under the action of the tension spring 5032. At the same time, the control lever 4 as a whole will also return to its initial position for the next unlocking.

[0042] like Figure 6 and Figure 7 As shown, a set of L-shaped toothed plates 201 are symmetrically arranged in the center of the lock box 2. The L-shaped toothed plates 201 are slidably installed on the inner side wall of the lock box 2. The lock cylinder rod 202 is fixedly installed on the top of the corresponding L-shaped toothed plate 201. The drive rod 5 is fixedly sleeved with drive teeth 504, and the two sides of the drive teeth 504 mesh with the L-shaped toothed plates 201.

[0043] Specifically, by setting up L-shaped toothed plates 201, when the control rod 4 drives the drive rod 5 to rotate, the drive rod 5 will drive the drive teeth 504 to rotate synchronously. The drive teeth 504 will drive the L-shaped toothed plates 201 at both ends to move towards each other, thereby causing the lock cylinder rods 202 at both ends to extend outward or retract inward at the same time, thereby realizing the unlocking or locking control.

[0044] like Figures 7-9 As shown, the first locking mechanism 6 includes a sleeve 601, which is fixedly installed on the mounting bracket 3. The bottom end of the sleeve 601 has a through hole for the lock cylinder rod 202 to pass through. The top end of the sleeve 601 has a sliding rod 602, and the top end of the rod 602 has an energized contact block 603. The bottom end of the rod 602 has a top plate 604, and a top spring 605 is provided between the upper end of the top plate 604 and the sleeve 601.

[0045] Furthermore, a radially sliding ball 606 is provided on the inner wall of the sleeve 601, a push spring 607 is provided between the tail end of the ball 606 and the sleeve 601, a limiting hole 6041 is provided on the outer wall of the top plate 604 to engage with the ball 606, and a positioning hole 2021 is provided on the outer wall of the lock cylinder rod 202 to engage with the ball 606.

[0046] Specifically, in its natural state, the top plate 604 is pressed down into the bottom of the sleeve 601 under the action of the top spring 605, while the ball 606 is precisely inserted into the limiting hole 6041 on the outer wall of the top plate 604 under the action of the push spring 607, thereby limiting and locking the top plate 604, keeping the top plate 604 in a fixed position, thus preventing the energized contact block 603 from shaking up and down and causing accidental contact.

[0047] like Figures 10-11 As shown, the mounting bracket 3 is fixedly installed on the ring main unit cabinet by the mounting side plate 301 on one side. The upper end of the mounting bracket 3 is fixedly provided with an energized contact plate 302. The bottom of the energized contact plate 302 has a contact point that passes through the mounting bracket 3 and is located directly above the energized contact block 603.

[0048] Furthermore, the second lock 7 includes a lock housing 701, which is fixedly installed on the mounting bracket 3. A metal plate 702 is movably installed inside the lock housing 701. Both ends of the metal plate 702 are slidably installed on the slide rod. A lock cylinder block 704 adapted to the lock hole 204 is fixedly installed at the bottom of the metal plate 702. A return spring 705 is provided between the bottom end of the metal plate 702 and the mounting bracket 3. An electromagnetic coil 703 is fixedly installed at the bottom inside the lock housing 701. The electromagnetic coil 703 realizes the power-on and power-off control through the contact or separation of the energized contact block 603 and the energized contact plate 302.

[0049] Specifically, by setting the first locking lock 6 and the second locking lock 7, when locking, the drive rod 5 drives the lock cylinder rod 202 to extend outward until the lock cylinder rod 202 extends into the corresponding sleeve 601. At this time, the lock cylinder rod 202 will push the top plate 604 upward, and the top spring 605 will begin to compress and deform. The top plate 604 will cause the energized contact block 603 to rise synchronously through the push rod 602 until the energized contact block 603 contacts the contact point at the bottom of the energized contact plate 302, thereby realizing the ring network. The cabinet is automatically powered on, and at the same time, the rolling ball 606 will be engaged in the positioning hole 2021 of the lock cylinder rod 202, thereby limiting and locking the lock cylinder rod 202 to keep it in a fixed position. The electromagnetic coil 703 will also be energized to generate magnetism. The metal plate 702 moves downward under the magnetic attraction and drives the lock cylinder block 704 to engage with the lock hole 204. In the locking process, while realizing automatic power-on, it will also achieve double mechanical locking through two sets of locking structures, effectively improving the locking reliability of the ring main unit.

[0050] More specifically, to prevent the push rod 602 from rotating axially relative to the sleeve 601 and causing the position of the limiting hole 6041 to shift, the push rod 602 and the sleeve 601 in this embodiment adopt a limiting sliding fit. A groove can be provided on the outer wall of the push rod 602 along the axis, and a protrusion adapted to the groove can be provided on the top inner wall of the sleeve 601. This allows the push rod 602 to only move linearly up and down along the axis without rotating, thus ensuring that the limiting hole 6041 can always be accurately aligned with the ball 606.

[0051] The working principle of this invention is as follows: Figures 1-11 As shown, when locking the ring main unit, the operator inserts the key into slot 403 and presses the control lever 4 to slide it inward until the inclined push head 501 enters the clearance slot 404 and contacts the radial locking block 405. Since one side of the radial locking block 405 is arc-shaped, the inclined push head 501 will push the radial locking block 405 inward until the inclined push head 501 has completely passed the radial locking block 405. At this time, the radial locking block 405 will be smoothly locked into the corresponding locking hole 502 under the action of the compression spring 4051, and a clear "click" sound will be made. The operator can clearly judge from the sound and touch that the control lever 4 and the drive lever 5 have been locked. Then, the operator stops pressing the control lever 4 and starts to rotate the control lever 4. At this time, the control lever 4 can drive the drive lever 5 to start rotating synchronously. The drive lever 5 will drive the drive gear 504 to rotate synchronously. The drive gear 504 will drive the L at both ends. The toothed plates 201 move towards each other, causing the lock cylinder rods 202 at both ends to extend outwards simultaneously until they are inserted into the corresponding sleeves 601. At this point, the lock cylinder rods 202 will push the top plate 604 upwards, and the top spring 605 will begin to compress and deform. The top plate 604 will then cause the energized contact block 603 to rise synchronously through the top rod 602 until the energized contact block 603 contacts the contact point at the bottom of the energized contact plate 302, thereby realizing the automatic power-on of the ring main unit. At the same time, the ball 606 will be inserted into the positioning hole 2021 of the lock cylinder rod 202, thereby limiting and locking the lock cylinder rod 202 to keep it in a fixed position. The electromagnetic coil 703 will also be energized and generate magnetism. The metal plate 702 will move downwards under the magnetic attraction and drive the lock cylinder block 704 to engage with the lock hole 204. In the locking process, while realizing automatic power-on, the locking process will also achieve double mechanical locking through two sets of locking structures. Similarly, when unlocking the ring main unit, the control rod 4 drives the drive rod 5 to rotate in the opposite direction. At this time, the lock cylinder rods 202 at both ends retract inward, and the energized contact block 603 disengages from the energized contact plate 302. This allows for automatic power cut-off during unlocking, forming circuit protection and greatly improving operational safety. At the same time, the lock cylinder rod 202 will gradually exit the sleeve 601, and the lock cylinder block 704 will gradually exit the lock hole 204 to smoothly achieve the unlocking process.

[0052] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the present invention should still fall within the scope of the present invention.

Claims

1. A ring main unit locking device, comprising a housing (1) fixedly installed on the door of the ring main unit and a fixing frame (3) fixedly installed on the cabinet body of the ring main unit, characterized in that, The housing (1) is fixedly provided with a lock box (2) at its tail end. The lock box (2) is located between two sets of upper and lower fixing frames (3) and is adapted and blocked by the fixing frames (3). A control rod (4) and a drive rod (5) are coaxially arranged inside the housing (1). The control rod (4) is axially slidably installed inside the housing (1), and the drive rod (5) is rotatably installed inside the housing (1). Lock cylinder rods (202) are movably installed at the upper and lower ends inside the lock box (2). Interlocking plates (203) are extended from the upper and lower ends of the side wall of the lock box (2). A lock hole (204) is provided through the lock plate (203). A first lock (6) and a second lock (7) are respectively provided on the fixing frame (3). Pressing the control rod (4) makes it form a self-locking engagement with the drive rod (5). The control rod (4) drives the drive rod (5) to rotate to realize the power on and off control of the ring network cabinet. The control rod (4) drives the drive rod (5) to rotate, which will also make the first lock (6) lock or unlock the lock cylinder rod (202), and at the same time make the second lock (7) lock or unlock the lock hole (204). A limiting rod sleeve (401) is fitted on the outer wall of the control rod (4). The limiting rod sleeve (401) is rotatably installed in the housing (1) and forms a limiting sliding fit with the control rod (4). A pressing spring (402) is provided between one side of the limiting rod sleeve (401) and the control rod (4). The control lever (4) has a slot (403) for inserting a key at its head end and a clearance groove (404) for moving the control lever (4) at its tail end. A radial locking block (405) is slidably installed on the inner wall of the clearance groove (404) in a circumferential direction. A compression spring (4051) is provided between the tail end of the radial locking block (405) and the control lever (4). The drive rod (5) is rotatably mounted in the housing (1) through an annular protrusion. An inclined push head (501) is fixed to one end of the drive rod (5) near the control rod (4). The radial block (405) is arc-shaped at one end near the inclined push head (501). A locking hole (502) adapted to the radial block (405) is provided on the outer wall of the drive rod (5). A movable rod sleeve (503) is slidably sleeved on the outer wall of the drive rod (5). The movable rod sleeve (503) has a stepped inclined section (5031) at one end near the inclined push head (501). The inclined stepped section (5031) is in the opposite direction to the inclined surface of the inclined push head (501), and the inclined stepped section (5031) matches the end face of the inclined push head (501). A tension spring (5032) is provided between the end of the movable rod sleeve (503) away from the inclined push head (501) and the housing (1). The movable rod sleeve (503) moves away from the inclined push head (501) under the tension of the tension spring (5032).

2. The ring main unit interlocking device according to claim 1, characterized in that, A set of L-shaped toothed plates (201) are symmetrically arranged in the center of the lock box (2). The L-shaped toothed plates (201) are slidably installed on the inner side wall of the lock box (2). The lock cylinder rod (202) is fixedly installed on the top of the corresponding L-shaped toothed plate (201). The drive rod (5) is fixedly sleeved with drive teeth (504). The drive teeth (504) mesh with the L-shaped toothed plates (201) on both sides.

3. The ring main unit interlocking device according to claim 1, characterized in that, The first locking mechanism (6) includes a sleeve (601), which is fixedly installed on the mounting bracket (3). The bottom end of the sleeve (601) is provided with a through hole for the lock cylinder rod (202) to pass through. The top end of the sleeve (601) is slidably provided with a top rod (602). The top end of the top rod (602) is fixedly provided with an energized contact block (603). The bottom end of the top rod (602) is fixedly provided with a top plate (604). A top spring (605) is provided between the upper end of the top plate (604) and the sleeve (601).

4. A ring main unit interlocking device according to claim 3, characterized in that, The inner wall of the sleeve (601) is provided with a radially sliding ball (606), and a push spring (607) is provided between the tail end of the ball (606) and the sleeve (601). The outer wall of the top plate (604) is provided with a limiting hole (6041) that engages with the ball (606), and the outer wall of the lock core rod (202) is provided with a positioning hole (2021) that engages with the ball (606).

5. A ring main unit interlocking device according to claim 4, characterized in that, The fixing frame (3) is fixedly installed on one side of the ring network cabinet by the mounting side plate (301). The upper end of the fixing frame (3) is fixedly provided with an electric contact plate (302). The bottom of the electric contact plate (302) has a contact point that passes through the fixing frame (3) and the contact point is located directly above the electric contact block (603).

6. A ring main unit interlocking device according to claim 5, characterized in that, The second lock (7) includes a lock shell (701), which is fixedly installed on a fixing frame (3). A metal plate (702) is movably installed inside the lock shell (701). Both ends of the metal plate (702) are slidably installed on a slide rod. A lock cylinder block (704) adapted to the lock hole (204) is fixedly provided at the bottom of the metal plate (702). A return spring (705) is provided between the bottom end of the metal plate (702) and the fixing frame (3). An electromagnetic coil (703) is fixedly installed at the bottom inside the lock shell (701). The electromagnetic coil (703) realizes the power-on and power-off control through the contact or separation of the energized contact block (603) and the energized contact plate (302).

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