Mechanical lock device for three-phase interlocked disconnector

Abstract

The present application relates to a mechanical lock device of a three-phase linkage disconnecting switch, which is part of the three-phase linkage disconnecting switch further comprising a base, three movable contact holders, three static contact holders, three knife switch assemblies, three connecting rod devices, a plurality of support insulators, a transmission shaft device, a self-locking spring, an operating handle and an anti-unhooking device. When not in operation, the mechanical lock working assembly is embedded in the base and circumferentially fixes the transmission shaft device, thereby locking the transmission shaft device and avoiding mis-tripping or mis-closing. The anti-unhooking device is installed on the knife switch assembly and is in transmission connection with the connecting rod device. The anti-unhooking device is detachably embedded in the movable contact holder under the traction of the connecting rod device. When the anti-unhooking device is embedded in the movable contact holder, the knife switch assembly is locked, so that even if the self-locking spring fails, the knife switch assembly can be reliably fixed to avoid mis-tripping.

Description

[0001] This application is a divisional application of the patent application entitled "Three-phase linkage disconnect switch". The original application was filed on July 23, 2020, and the application number is CN202010718109.4. Technical Field

[0002] This invention relates to the field of disconnecting switch technology, and in particular to a mechanical locking device for a three-phase linkage disconnecting switch. Background Technology

[0003] In power system transmission and transformation equipment, three-phase linkage high-voltage disconnect switches perform the crucial tasks of synchronously opening and closing three-phase power lines and ensuring maintenance safety. In a three-phase linkage high-voltage disconnect switch with vertically opening and closing control switches, the linkage drive mechanism of the three-phase disconnect switch includes a drive shaft device rotatably mounted on the base. The three drive cranks of the drive shaft device are respectively connected to three insulating pull rods in the middle of the three-phase disconnect switch. The operating handle is rotated using the disconnect switch operating lever to control the drive shaft device, thereby opening and closing the circuit. To prevent maloperation of the disconnect switch in the open state, the three-phase linkage high-voltage disconnect switch is equipped with a self-locking spring device. This self-locking is achieved through a self-locking spring between the drive cranks attached to the drive shaft device and the base. However, the elastic force of the self-locking spring can decay or fatigue, making it difficult to achieve a reliable self-locking design, which can easily lead to erroneous opening and closing. Summary of the Invention

[0004] To overcome the technical defects of the existing technology, the present invention provides a mechanical locking device for a three-phase linkage disconnect switch, which can reliably prevent accidental opening and closing of the switch.

[0005] The technical solution adopted in this invention is: a mechanical locking device for a three-phase interlocking disconnect switch, which is part of a three-phase interlocking disconnect switch. This three-phase interlocking disconnect switch also includes a base, three moving contact seats, three stationary contact seats, three knife switch assemblies, three connecting rod devices, several support insulators, a transmission shaft device, a self-locking spring, an operating handle, and an anti-disengagement device. The operating handle is fixedly mounted at the end of the transmission shaft device. The three moving contact seats and three stationary contact seats are mounted on the base via support insulators. One end of each knife switch assembly is hinged to a corresponding stationary contact seat, and the other end is movably connected to the corresponding moving contact seat. The transmission shaft device is rotatably mounted on the base. Three transmission crank arms are provided on the transmission shaft device at positions corresponding to each knife switch assembly. One end of each connecting rod device is hinged to a corresponding knife switch assembly, and the other end is hinged to a corresponding transmission crank arm. The transmission shaft device also has a self-locking crank arm, and one end of the self-locking spring is hinged to... The mechanical lock device includes a mechanical lock trigger assembly mounted on an operating handle and a mechanical lock working assembly that slides axially along a transmission shaft. The mechanical lock trigger assembly is driven by the mechanical lock working assembly. The mechanical lock working assembly is circumferentially fixed to the transmission shaft and is detachably embedded in a base. The anti-disengagement device is mounted on a knife switch assembly and driven by a linkage device. The anti-disengagement device is detachably embedded in a moving contact seat under the traction of the linkage device. The anti-disengagement device is mounted on a knife switch assembly. The hinge hole between the linkage device and the knife switch assembly is an elongated hole. The moving contact seat is provided with an anti-disengagement slot. One end of the anti-disengagement device is connected to the upper side of the linkage device, and the other end is detachably embedded in the anti-disengagement slot. The linkage device slides along the direction of the elongated hole to pull the anti-disengagement device. The anti-disengagement device has a hook detachably connected to the anti-disengagement slot, and the hook is provided with a guide slope.

[0006] As a further improvement of the present invention, the mechanical lock working assembly includes a mechanical lock reset component and a locking barrel. The mechanical lock reset component is installed between the operating handle and the locking barrel, and both ends of the mechanical lock reset component abut against the operating handle and the locking barrel respectively. The mechanical lock reset component acts in a direction that causes the locking barrel to press against the base. The locking barrel slides along the axial direction of the transmission shaft device and is circumferentially fixed to the transmission shaft device. The locking barrel is detachably connected to the base.

[0007] As a further improvement of the present invention, the locking barrel is integrally provided with a plurality of equally spaced limiting teeth on the side near the base, and the side wall of the base is provided with a plurality of tooth limiting holes that correspond to and cooperate with each limiting tooth.

[0008] As a further improvement of the present invention, the inner wall of the locking barrel is provided with a mechanical lock guide protrusion and the transmission shaft device is provided with a locking guide groove, and the mechanical lock guide protrusion slides along the locking guide groove.

[0009] As a further improvement of the present invention, the mechanical lock reset component is a compression spring, one end of which presses against the operating handle and the other end of which presses against the locking barrel.

[0010] The beneficial effects of this invention are:

[0011] The mechanical lock device includes a mechanical lock triggering component mounted on the operating handle and a mechanical lock working component that slides axially along the transmission shaft device. The mechanical lock triggering component is connected to the mechanical lock working component in a transmission manner. The mechanical lock working component is circumferentially fixed to the transmission shaft device and has a detachable embedded base.

[0012] When the disconnecting switch is not operated, the mechanical lock working component is embedded in the base and constrained by the base so that it cannot rotate. Because the mechanical lock working component is circumferentially fixed to the drive shaft device, even if the self-locking spring is unable to achieve reliable self-locking due to its own decay or fatigue, the drive shaft device is fixed by the mechanical lock working component, so the disconnector assembly will not be accidentally tripped. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the three-phase linkage disconnect switch of the present invention.

[0014] Figure 2 for Figure 1 Enlarged diagram of point B in the middle.

[0015] Figure 3 This is a schematic diagram of the locking barrel structure of the present invention.

[0016] Figure 4 This is a mechanical lock trigger component.

[0017] Figure 5 for Figure 4 Enlarged diagram of point C in the middle.

[0018] Figure 6 for Figure 1 Enlarged schematic diagram of point A in the middle.

[0019] Figure 7 This is a cross-sectional view of the drive shaft assembly at the position of the angle adjustment ring.

[0020] Figure 8 This is a schematic diagram of the transmission shaft device.

[0021] Figure 9 This is a schematic diagram of the anti-disengagement device when the circuit is closed.

[0022] Figure 10 This is a schematic diagram of the anti-disengagement device when the circuit breaker is tripped.

[0023] Figure 11 This is a side view schematic diagram of the three-phase linkage disconnect switch of the present invention.

[0024] Figure 12 for Figure 11 Schematic diagram of the structure at point E in the middle.

[0025] Figure 13 This is a schematic diagram of the structure of the three-phase linkage disconnect switch (excluding mechanical lock device) of the present invention.

[0026] Explanation of reference numerals in the attached drawings: 1. Base; 11. Toothed limiting hole; 21. Moving contact seat; 211. Anti-detachment groove; 22. Stationary contact seat; 31. Detachment traction rope; 32. Fastening hook; 321. Hook; 33. Elastic torsion member; 34. Guide post; 4. Knife switch assembly; 41. Conductive blade; 42. Hinge bolt; 43. Compression spring; 44. Compression nut; 45. Compression bolt; 5. Linkage device; 6. Transmission shaft device; 61. First rotating shaft; 611. Locking guide groove; 612. Reset step; 62. Second rotating shaft; 621. Second 63. Shaft guide groove; 64. Angle adjustment ring; 65. Dustproof and waterproof ring; 66. Angle ring guide protrusion; 67. Shaft return spring; 68. Limiting snap ring; 69. Transmission crank arm; 60. Self-locking crank arm; 71. Self-locking spring; 82. Operating handle; 83. Operating notch; 94. Limiting block; 95. Mechanical lock device; 96. Mechanical lock reset component; 97. Locking barrel; 98. Limiting tooth; 99. Mechanical lock guide protrusion; 90. Control panel; 91. First guide ring; 92. Second guide ring; 92. Mechanical lock traction rope. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings:

[0028] like Figure 1-13 As shown, this embodiment provides a mechanical locking device for a three-phase linkage disconnect switch, which is part of the three-phase linkage disconnect switch. The three-phase linkage disconnect switch also includes a base 1, three moving contact seats 21, three stationary contact seats 22, three knife switch assemblies 4, three linkage devices 5, several support insulators, a transmission shaft device 6, a self-locking spring 7, and an operating handle 8.

[0029] In this embodiment, the operating handle 8 is fixedly mounted on the end of the transmission shaft device 6. Three moving contacts 21 and three stationary contacts 22 are mounted on the base 1 via support insulators. One end of each knife switch assembly 4 is hinged to the corresponding stationary contact 22, and the other end is movably connected to the corresponding moving contact 21. The transmission shaft device 6 is rotatably mounted on the base 1. Three transmission cranks 66 are provided at positions corresponding to each knife switch assembly 4 on the transmission shaft device 6. One end of each connecting rod device 5 is hinged to the corresponding knife switch assembly 4, and the other end is hinged to the corresponding transmission crank 66. The transmission shaft device 6 is also provided with a self-locking crank 67. Rotating the operating handle 8 using the disconnect switch operating lever will... The drive shaft device 6 drives three drive crank arms 66, which in turn causes the three linkage devices 5 to pull the corresponding knife switch assembly 4 to achieve synchronous closing and opening. One end of the self-locking spring 7 is hinged to the self-locking crank arm 67 and the other end is hinged to the base 1. The self-locking spring 7 locks the self-locking crank arm 67 by pressing it. The mechanical lock device 9 includes a mechanical lock trigger assembly installed on the operating handle 8 and a mechanical lock working assembly that slides along the axis of the drive shaft device 6. The mechanical lock trigger assembly and the mechanical lock working assembly are connected in a transmission connection. The mechanical lock working assembly is circumferentially fixed to the drive shaft device 6 and is detachably embedded in the base 1.

[0030] When the disconnecting switch is not operated, the mechanical lock working component is embedded in the base 1 and is constrained by the base 1 and cannot rotate. Since the mechanical lock working component is circumferentially fixed to the transmission shaft device 6, even if the self-locking spring 7 is unable to achieve reliable self-locking due to its own decay or fatigue, the transmission shaft device 6 is fixed by the mechanical lock working component, so the knife switch assembly 4 will not be accidentally tripped.

[0031] When it is necessary to open the circuit, the operator uses the disconnecting switch operating rod to pull the mechanical lock triggering component. The mechanical lock triggering component is connected to the mechanical lock working component and pulls the mechanical lock working component to slide axially along the transmission shaft device 6, eventually causing the mechanical lock working component to disengage from the base 1. In this way, the transmission shaft device 6 is released from circumferential fixation. At this time, the disconnecting switch operating rod can hook the operating handle 8 to rotate the operating handle 8 to complete the opening.

[0032] After the circuit breaker is tripped, the operating lever of the isolating switch disengages from the mechanical lock triggering component, and the mechanical lock working component is re-embedded into the base 1, circumferentially fixing the transmission shaft device 6. This re-locks the transmission shaft device 6, preventing accidental closing.

[0033] In this embodiment, the mechanical lock working assembly includes a mechanical lock reset component 911 and a locking barrel 912. The mechanical lock reset component 911 and the locking barrel 912 are respectively fitted into the transmission shaft device 6. The locking barrel 912 is circumferentially fixed on the transmission shaft device 6 and slides along the axial direction of the transmission shaft device 6. The mechanical lock reset component 911 is installed between the operating handle 8 and the locking barrel 912. The mechanical lock reset component 911 is a compression spring, with one end pressing against the operating handle 8 and the other end pressing against the locking barrel 912. The action direction of the mechanical lock reset component 911 causes the locking barrel 912 to press against the base 1. The inner wall of the locking barrel 912 is provided with a mechanical lock guide protrusion 9122, and the transmission shaft device 6 is provided with a locking guide groove 611. The mechanical lock guide protrusion 9122 slides along the locking guide groove 611, causing the locking barrel 912 to slide along the axial direction of the transmission shaft device 6, and the locking barrel 912 and the transmission shaft... The device 6 is circumferentially fixed. The locking barrel 912 is integrally provided with several equally spaced limiting teeth 9121 on the side near the base 1. The side wall of the base 1 is provided with several tooth limiting holes 11 that correspond to each limiting tooth 9121. The limiting teeth 9121 are detachably embedded in the base 1. When the limiting teeth 9121 are embedded in the base 1, they circumferentially fix the transmission shaft device 6 and lock the knife switch assembly 4 to prevent the knife switch assembly 4 from being misoperated. When it is necessary to perform the opening and closing operation, the disconnecting switch operating rod pulls the mechanical lock triggering component and then pulls the locking barrel 912 to slide along the axial direction of the transmission shaft device 6. The limiting teeth 9121 disengage from the tooth limiting holes 11 and release the circumferential fixation of the transmission shaft device 6. Since the disconnecting switch operating rod has already applied pressure to the mechanical lock triggering component, that is, applied pressure to the operating handle 8, the disconnecting switch operating rod can then pull the operating handle 8 to perform the opening and closing operation.

[0034] In this embodiment, the operating handle 8 is provided with an operating notch 81. The mechanical lock triggering assembly includes a control plate 921, a first guide ring 922, a second guide ring 923, and a mechanical lock traction rope 924. The first guide ring 922 and the second guide ring 923 are both fixedly mounted on the side of the operating handle 8 near the base 1. One end of the control plate 921 is hinged to the operating notch 81, and the other end is fixedly mounted with the mechanical lock traction rope 924. The operating handle 8 is provided with a limiting block 82, which abuts against the control plate 921 on the side of the control plate 921 near the operating notch 81, limiting the rotation range of the control plate 921 and preventing the control plate 921 from disengaging from the operating notch 81. One end of the mechanical lock traction rope 924 is fixedly mounted on the control plate 921, and the other end is fixedly mounted on the mechanical lock working assembly. The mechanical lock traction rope 924 passes through the first guide ring 922 and the second guide ring 923 in sequence. The mechanical lock traction rope 924 runs parallel to the operating handle 8 between the first guide ring 922 and the second guide ring 923. The mechanical lock traction rope 924 runs parallel to the transmission shaft device 6 between the second guide ring 923 and the mechanical lock assembly. When the disconnecting switch operating lever performs opening and closing operations, it must hook onto the operating notch 81. Before pressing down on the operating notch 81, the control plate 921 is first pressed down. The control plate 921 rotates, thereby pulling the mechanical lock traction rope 924. Guided by the first guide ring 922 and the second guide ring 923, the mechanical lock traction rope 924 pulls the mechanical lock working assembly, specifically, it pulls the locking barrel 912 to slide along the transmission shaft device 6 and disengage from the base 1. This achieves the purpose of opening and closing only when the disconnecting switch operating lever presses down on the control plate 921, preventing accidental opening and closing.

[0035] In this embodiment, the transmission shaft device 6 includes a first rotating shaft 61, a second rotating shaft 62, and an angle adjusting ring 63. Both the first rotating shaft 61 and the second rotating shaft 62 are rotatably mounted on the base 1. Notably, both the first rotating shaft 61 and the second rotating shaft 62 are mounted on the base 1 via bearings, specifically self-aligning roller bearings. To ensure the stability of the first rotating shaft 61 and the second rotating shaft 62, the second rotating shaft 62 is mounted on the base 1 via at least two bearings at different positions in the axial direction. The first rotating shaft 61 has several axially arranged first shaft guide grooves equidistantly arranged on its circumferential surface. The inner hole of the angle adjusting ring 63... A plurality of axially arranged angle ring guide protrusions 631 are provided at equal intervals. Each angle ring guide protrusion 631 is inserted into the corresponding first shaft guide groove and slides, thereby realizing that the angle adjustment ring 63 is circumferentially fixed on the first rotating shaft 61 and slides along the first rotating shaft 61. A plurality of axially arranged second shaft guide grooves 621 are provided at equal intervals on the circumferential surface of the second rotating shaft 62. A plurality of axially arranged angle ring guide protrusions 631 are provided at equal intervals in the inner hole of the angle adjustment ring 63. Each angle ring guide protrusion 631 is inserted into the corresponding second shaft guide groove 621 and slides, thereby realizing that the angle adjustment ring 63 is detachably fixed to the second rotating shaft 62 circumferentially.

[0036] The operating handle 8 is fixedly mounted at the end of the first rotating shaft 61. Three transmission crank arms 66 are provided on the second rotating shaft 62 at positions corresponding to each disconnector assembly 4. The self-locking crank arm 67 is integrally mounted on the second rotating shaft 62. Since this three-phase linkage disconnector has various different installation angles, the angle of the operating handle 8 must be adjusted to adapt to the angle of the base 1. Because the installation angle of the transmission crank arm 66 follows the rotation of the base 1, it is necessary to adjust the angle between the operating handle 8 and the transmission crank arm 66, that is, the operating handle 8 rotates around the second rotating shaft 62. When adjusting the angle of the operating handle 8, one hand presses down on the control plate 921 to release the locking barrel 912 from the base 1, and the other hand moves the angle adjustment ring 63 to disengage the angle adjustment ring 63 from the second rotating shaft 62. At this time, the angle of the operating handle 8 can be adjusted by rotating the operating handle 8 alone, so that the operating handle 8 adapts to the installation angle of the base 1. Since the adjustment can be completed by hand without the use of tools, the adjustment is convenient and quick.

[0037] In this embodiment, the transmission shaft device 6 further includes a shaft return spring 64. A return step 612 is integrally provided on the first shaft 61. One end of the shaft return spring 64 presses against the return step 612, while the other end presses against the angle adjustment ring 63. When the shaft return spring 64 is in a free state, the angle adjustment ring 63 spans the first shaft 61 and the second shaft 62, so that the angle adjustment ring 63 is circumferentially fixed to both the first shaft 61 and the second shaft 62. When the shaft return spring 64 is in the compression limit position, the angle adjustment ring 63 and the second shaft 62 are... To disengage from the first rotating shaft 61 and the second rotating shaft 62, pull the angle adjusting ring 63 to compress the rotating shaft return spring 64 to its limit position. This disengages the angle adjusting ring 63 from the second rotating shaft 62. Then, rotate the operating handle 8 to the appropriate angle. After adjustment, release the angle adjusting ring 63 so that it, under the push of the rotating shaft return spring 64, crosses the first rotating shaft 61 and the second rotating shaft 62 again, thus fixing the angle adjusting ring 63 circumferentially to both the first rotating shaft 61 and the second rotating shaft 62.

[0038] The drive shaft device 6 also includes a limiting snap ring 65, which is installed on the second rotating shaft 62. When the return spring is in the extension limit position, the angle adjusting ring 63 locks the limiting snap ring 65, restricting the position of the angle adjusting ring 63 and preventing it from falling off. The angle adjusting ring 63 is integrally provided with a dustproof and waterproof ring 632, which forms an isolation cavity with the first rotating shaft 61. The rotating shaft return spring 64 is installed in the isolation cavity. The dustproof and waterproof ring 632 prevents the rotating shaft return spring 64 from being directly exposed to the outside environment and thus from being corroded and failing.

[0039] In this embodiment, the disconnecting switch also includes an anti-disengagement device, which is installed on the knife switch assembly 4. The hinge hole between the connecting rod device 5 and the knife switch assembly 4 is an elongated hole. The moving contact seat 21 is provided with an anti-disengagement slot 211. One end of the anti-disengagement device is connected to the upper side of the connecting rod device 5, and the other end is detachably embedded in the anti-disengagement slot 211. The connecting rod device 5 slides along the direction of the elongated hole to pull the anti-disengagement device. The disconnecting switch also includes an anti-disengagement elastic reset member, one end of which is installed on the knife switch assembly 4, and the other end is connected to the anti-disengagement device. The action direction of the anti-disengagement elastic reset member causes the anti-disengagement device to be embedded in the anti-disengagement slot 211. When the knife switch assembly 4 is closed, the anti-disengagement device is embedded in the anti-disengagement slot 211 under the traction of the anti-disengagement elastic reset member. Even if the self-locking spring 7 fails, the knife switch assembly 4 can be reliably fixed.

[0040] In this embodiment, each knife switch assembly 4 includes two conductive blades 41, a hinge bolt 42, a clamping spring 43, a clamping nut 44, and a clamping bolt 45. The two conductive blades 41 clamp the corresponding stationary contact 22. Both conductive blades 41 are hinged to the stationary contact 22 by the hinge bolt 42. The two conductive blades 41 can be detachably clamped to the corresponding moving contact 21. The clamping bolt 45 passes through the two conductive blades 41 and the clamping spring 43 in sequence. The clamping bolt 45 and the clamping nut 44 are threadedly connected to clamp the two conductive blades 41. One end of the clamping spring 43 abuts against the clamping nut 44 and the other end abuts against the clamping bolt 45. When the two conductive blades 41 clamp the moving contact 21, the clamping spring 43 provides elastic support to ensure that the two conductive blades 41 reliably clamp the moving contact 21.

[0041] In this embodiment, the anti-disengagement device includes a disengagement traction rope 31, a fastening hook 32, and a guide post 34. The anti-disengagement elastic reset component is an elastic torsion member 33. The guide post 34 is fixed between two conductive blades 41. The connecting rod device 5 is hinged between the two conductive blades 41. One end of the fastening hook 32 is hinged between the two conductive blades 41, and the other end is integrally provided with a hook 321 detachably connected to the anti-disengagement slot 211. One end of the disengagement traction rope 31 is fixed to the top of the connecting rod device 5, and the other end is fixed to the fastening hook 32. The disengagement traction rope 31 passes around the guide post 34, and the elastic torsion member 33... One end is connected to the fastening hook 32 and the other end is connected to the conductive blade 41. The elastic torsion member 33 is a torsion spring. One end of the torsion spring is connected to the fastening hook 32 and the other end is connected to the conductive blade 41. The direction of the torsion spring causes the hook 321 to be embedded in the anti-detachment slot 211. When the circuit breaker is opened, the operating handle 8 is rotated and the transmission crank arm 66 pushes the connecting rod device 5 to slide upward. The connecting rod device 5 slides along the direction of the long hole and pulls the hook release traction rope 31. The hook release traction rope 31 overcomes the elastic force of the elastic torsion member 33 and pulls the hook 321 out of the anti-detachment slot 211 to realize the circuit breaker opening. The circuit breaker opening can be realized only when the operating handle 8 is rotated.

[0042] The position where the fastening hook 32 is fixed to the release traction rope 31 is the rope traction position. The distance between the rope traction position and the hinge position of the fastening hook 32 is less than the distance between the rope traction position and the hook 321. In this way, the small stroke movement of the release traction rope 31 can be converted into the large stroke movement of the hook 321, ensuring the real-time response of the operating handle 8 and shortening the rotation distance of the operating handle 8.

[0043] The hook 321 is provided with a guide slope. When the release traction rope 31 slides along the long hole of the connecting rod device 5, it pulls the fastening hook 32 and makes the movement trajectory of the guide slope pass through the moving contact seat 21. In this way, when the circuit is closed, the guide slope first contacts the moving contact seat 21, and the fastening hook 32 swings slightly under the guidance of the guide slope, and then continues to slide down until it is embedded in the anti-disengagement groove 211, so as to avoid the fastening hook 32 colliding with the moving contact seat 21.

[0044] The foregoing has shown and described the basic principles and main features of the present invention, as well as its advantages. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the present invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope. All such changes and modifications fall within the scope of the present invention as claimed, which is defined by the appended claims and their equivalents.

Claims

1. A mechanical locking device for a three-phase interlocking disconnector, which is part of the three-phase interlocking disconnector. The three-phase interlocking disconnector further includes a base, three moving contacts, three stationary contacts, three knife switch assemblies, three linkage devices, several support insulators, a drive shaft assembly, a self-locking spring, and an operating handle. The operating handle is fixedly mounted at the end of the drive shaft assembly. The three moving contacts and three stationary contacts are mounted on the base via support insulators. One end of each knife switch assembly is hinged to a corresponding stationary contact, and the other end is movably connected to a corresponding moving contact. The drive shaft assembly is rotatably mounted on the base. The drive shaft assembly and... Each knife switch assembly has three transmission cranks at corresponding positions. One end of each connecting rod is hinged to the corresponding knife switch assembly, and the other end is hinged to the corresponding transmission crank. The transmission shaft assembly also has a self-locking crank. One end of the self-locking spring is hinged to the self-locking crank, and the other end is hinged to the base. The mechanical lock device includes a mechanical lock trigger assembly mounted on the operating handle and a mechanical lock working assembly that slides axially along the transmission shaft assembly. The mechanical lock trigger assembly and the mechanical lock working assembly are drively connected. The mechanical lock working assembly is circumferentially fixed to the transmission shaft assembly and is detachably embedded in the base. The mechanical lock working assembly includes a mechanical lock reset component and a locking barrel. The mechanical lock reset component is installed between the operating handle and the locking barrel, with its two ends respectively abutting against the operating handle and the locking barrel. The mechanical lock reset component acts to press the locking barrel against the base. The locking barrel slides along the axial direction of the transmission shaft device and is circumferentially fixed to the transmission shaft device. The locking barrel is detachably connected to the base. The operating handle has an operating notch. The mechanical lock triggering assembly includes a control plate, a first guide ring, a second guide ring, and a mechanical lock traction rope. The first and second guide rings are both fixedly mounted on the side of the operating handle near the base. One end of the control panel is hinged to the control notch, while the other end is fixed with a mechanical lock traction rope. The operating handle is provided with a limiting block, which abuts against the control panel on the side of the control panel near the control notch, limiting the rotation range of the control panel and preventing the control panel from disengaging from the control notch. One end of the mechanical lock traction rope is fixed to the control panel, and the other end is fixed to the mechanical lock working component. The mechanical lock traction rope passes through the first guide ring and the second guide ring in sequence. The direction of the mechanical lock traction rope between the first guide ring and the second guide ring is parallel to the operating handle, and the direction of the mechanical lock traction rope between the second guide ring and the mechanical lock working component is parallel to the transmission shaft device.

2. The mechanical locking device for the three-phase linkage disconnect switch according to claim 1, characterized in that, The locking barrel has a number of equidistant limiting teeth on the side near the base, and the side wall of the base has a number of tooth limiting holes that correspond to and cooperate with each limiting tooth.

3. The mechanical locking device for the three-phase linkage disconnect switch according to claim 1, characterized in that, The inner wall of the locking barrel is provided with a mechanical lock guide protrusion, and the transmission shaft device is provided with a locking guide groove. The mechanical lock guide protrusion slides along the locking guide groove.

4. The mechanical locking device of the three-phase linkage disconnect switch according to claim 1, characterized in that, The mechanical lock reset component is a compression spring, with one end of the compression spring pressing against the operating handle and the other end pressing against the locking barrel.

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