A pole-mounted circuit breaker with mechanical self-locking

Abstract

The application discloses a pole-mounted circuit breaker with mechanical self-locking, which comprises a mechanical box, a circuit breaker is installed on the top of the mechanical box, and a knife switch is installed on one side of the circuit breaker; a fixing frame is fixedly installed on one side of the mechanical box, a connecting head is installed on the side, away from the circuit breaker, of the fixing frame, and an operating mechanism for operating the knife switch is installed on the fixing frame; the circuit breaker comprises an insulating shell, a static contact is fixedly installed on the top of the insulating shell, and a connecting head is installed on the top of the static contact; a corrugated expansion pipe is installed at the bottom of the insulating shell, and a dynamic contact is fixedly installed at the center of the corrugated expansion pipe. Through the cooperative work of the triggering assembly, the triggering switch and the control box, the application can not only identify transmission jam faults and timely alarm, but also can monitor the contact pressure state in real time, trigger maintenance early warning when the contact is worn to the insufficient contact performance, effectively avoid the contact fusion accident, and guarantee the overall operation safety of the power grid.

Description

Technical Field

[0001] This invention relates to the field of pole-mounted circuit breaker technology, and more particularly to a pole-mounted circuit breaker with mechanical self-locking. Background Technology

[0002] Pole-mounted circuit breakers are outdoor pole-mounted high-voltage power distribution equipment. They mostly use vacuum arc extinguishing and are suitable for urban and rural overhead lines. They can switch on and off loads, overloads and short-circuit currents. In case of a fault, they automatically trip to isolate the faulty section and reduce the power outage area.

[0003] Pole-mounted circuit breakers connect via moving and stationary contacts, placing the circuit breaker in the connected state. A disconnector then connects the circuit breaker, and subsequent maintenance involves arc extinguishing via the circuit breaker. The disconnector provides a clearly visible isolation point for electrical isolation. However, over time, factors such as melting and wear can cause the moving contact to lose contact with the stationary contact, increasing the resistance at the contact point and causing a sustained rise in contact temperature. Ultimately, this can lead to the moving and stationary contacts fusing together, preventing the circuit breaker from breaking the circuit properly. This can affect the operational safety of the entire power grid in the relevant circuits. Obstruction of the internal mechanical transmission of the control box can also prevent the moving and stationary contacts from closing. Furthermore, the disconnector lacks a self-locking mechanism when closed or open, making it prone to accidental opening or closing due to accidental contact. Additionally, the entire circuit breaker is in an open state, making it vulnerable to damage from severe weather such as hail. Therefore, a device is needed to address these issues. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned shortcomings by providing a pole-mounted circuit breaker with mechanical self-locking.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: A pole-mounted circuit breaker with mechanical self-locking includes a mechanical housing, on the top of which the circuit breaker is mounted, and on one side of which a disconnect switch is mounted. A mounting bracket is fixedly mounted on one side of the mechanical housing, and a connector is mounted on the side of the mounting bracket away from the circuit breaker. An operating mechanism for operating the disconnect switch is mounted on the mounting bracket. The circuit breaker includes an insulating housing, a stationary contact fixedly mounted on the top of the insulating housing, and a connector mounted on the top of the stationary contact; a corrugated expansion tube mounted on the bottom of the insulating housing, and a moving contact fixedly mounted at the center of the corrugated expansion tube; a groove is formed at the bottom of the moving contact, and a movable rod is movably mounted in the groove, the movable rod having an inverted T-shaped cross-section; an elastic component is provided between the movable rod and the moving contact; an insulating cover is fixedly mounted on the outside of the movable rod, the insulating cover being movably fitted over the outside of the moving contact; a trigger switch is fixedly mounted on the inner wall of the corrugated expansion tube, the trigger switch having upper and lower trigger surfaces; a trigger component is provided on the moving contact; and a pressure block is fixedly mounted on the outside of the insulating cover. A control box is fixedly installed on one side of the mechanical box. The control box is electrically connected to the trigger switch. The control box is used to receive the detection signal from the trigger switch and is wirelessly connected to an external control terminal.

[0006] Furthermore, the triggering component includes an oil bladder, which is installed at the top of the inner cavity of the moving contact groove; a perforation is provided on one side of the moving contact; a rubber hose is connected to the outside of the oil bladder, and the rubber hose extends through the perforation to the outside of the moving contact; a hollow block is fixedly installed on the top triggering surface of the trigger switch, and the bottom surface of the hollow block is a rubber membrane structure; the bottom of the rubber hose is connected to and fixed to the top of the hollow block, so that the oil bladder, the rubber hose and the interior of the hollow block form a communicating cavity, and the communicating cavity is filled with hydraulic oil.

[0007] Furthermore, the operating mechanism includes a movable shaft, which is rotatably mounted inside the fixed frame; an operating rod is fixedly mounted at one end of the movable shaft, and the two ends of the operating rod are symmetrically provided with circular holes for applying force to rotate; a swing arm is fixedly sleeved on the outside of the movable shaft, and a connecting rod is hinged to the top of the swing arm; the knife switch is hinged to one side of the circuit breaker, and the top of the connecting rod is hinged to the bottom of the knife switch; a limiting component for limiting the rotation position of the operating rod is installed on the mechanical housing.

[0008] Furthermore, the limiting component includes an arc-shaped block, which is fixedly installed on the mechanical housing; an arc-shaped groove is formed inside the arc-shaped block; a limiting hole is correspondingly formed on the operating rod; a slider is slidably installed in the groove, and the slider can reciprocate along the axial direction of the groove; a limiting block is fixedly installed on the slider, the end of the limiting block near the operating rod is arc-shaped, and the limiting block is adapted to engage with the limiting hole; a return spring is provided between the slider and the inner sidewall of the groove; a stop is fixedly installed on the arc-shaped block, and the stop is used to limit the extreme rotation range of the operating rod.

[0009] Furthermore, an anti-pull mechanism is provided on the outside of the connector; the anti-pull mechanism includes a U-shaped frame, which is fixedly installed on the fixing frame and the circuit breaker, and the U-shaped frame is sleeved on the outside of the connector; a cover plate is fixedly installed on the outside of the U-shaped frame, and the cover plate and the U-shaped frame enclose a relatively closed protective space; a fixing tube is installed on the U-shaped frame; multiple elastic pressure plates are fixed at equal intervals along the circumference at the end of the fixing tube away from the U-shaped frame; a sleeve is fitted on the outside of the fixing tube by threaded engagement.

[0010] Furthermore, the sleeve is fixedly composed of a straight tube section and a frustum tube section, with the inner sidewall of the frustum tube section away from the U-shaped frame tightly attached to the outer surface of the elastic pressure plate.

[0011] Furthermore, a protective mechanism is provided on the top of the machine housing; the protective mechanism includes columns, which are fixedly installed on the top of the machine housing, and at least two columns are provided; a top plate is fixedly installed on the top of the columns, and an extension frame is fixedly installed on the bottom surface of the top plate, with a gap for cable routing between the extension frame and the top plate; a protective cloth is fixedly connected to the bottom surface of the extension frame, which is normally folded and stored; a counterweight frame is fixedly connected to the bottom end of the protective cloth; and a drive assembly for driving the counterweight frame to move up and down along the columns is installed on the top of the top plate.

[0012] Furthermore, the drive assembly includes a protective cover, which is fixedly installed on the top of the top plate; a rotating shaft is rotatably installed inside the protective cover; a first gear is fixedly sleeved on the outside of the rotating shaft; a drive motor is fixedly installed on the top of the top plate, and the drive motor is located inside the protective cover; a second gear is fixedly installed at the output end of the drive motor, and the second gear meshes with the first gear. The drive motor drives the first gear to rotate through the second gear, thereby driving the rotating shaft to rotate synchronously; steel wire ropes are wound around both ends of the rotating shaft, and the bottom end of the steel wire ropes passes through the top plate and is wound and fixed to the top of the counterweight frame.

[0013] Furthermore, the counterweight frame is movably sleeved on the outside of the column, and the column is used to guide the lifting and lowering movement of the counterweight frame.

[0014] Furthermore, four lifting rings are fixedly installed on the top of the machine box, and are respectively arranged at the four corners of the top of the machine box.

[0015] The beneficial effects of this invention are reflected in: This invention addresses the risks of poor contact and contact fusion caused by wear and melting of moving contacts during long-term operation, as well as the problem of contact failure to close due to transmission obstruction inside the mechanical housing. Through the coordinated work of the triggering component, triggering switch, and control box, it can identify transmission jamming faults and issue timely alarms, and monitor the contact pressure status of the contacts in real time. When the contacts wear to the point of insufficient contact performance, it triggers maintenance warnings, effectively avoiding contact fusion accidents and ensuring the overall safe operation of the power grid.

[0016] In this invention, the limiting component configured in the operating mechanism can achieve mechanical self-locking of the knife switch, effectively preventing accidental opening and closing of the operating lever due to accidental contact, and improving the operational stability of the equipment.

[0017] This invention allows the protective mechanism to unfold and wrap the main body of the equipment with protective cloth in severe weather such as hail, preventing damage to the insulating outer shell from external impacts; at the same time, the anti-pull mechanism at the connector can strengthen the connection strength of the power cord, reduce the risk of poor contact caused by external pulling, and comprehensively improve the reliability and service life of the equipment. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the pole-mounted circuit breaker with mechanical self-locking described in this invention; Figure 2 This is a side view of the pole-mounted circuit breaker with mechanical self-locking described in this invention; Figure 3 This is a first cross-sectional view of the pole-mounted circuit breaker with mechanical self-locking described in this invention; Figure 4 This is a schematic diagram of the protective mechanism structure of the pole-mounted circuit breaker with mechanical self-locking described in this invention; Figure 5 This is a second sectional view of the pole-mounted circuit breaker with mechanical self-locking described in this invention; Figure 6 This is a cross-sectional view of the pole-mounted circuit breaker with mechanical self-locking as described in this invention. Figure 7 Appendix to this invention Figure 3 Enlarged view of point A in the middle; Figure 8 Appendix to this invention Figure 5 Enlarged view of point B in the middle; Figure 9 Appendix to this invention Figure 6 Enlarged diagram of point C in the middle.

[0019] In the picture: 1. Mechanical case; 2. Control box; 3. Circuit breaker; 31. Insulating housing; 32. Stationary contact; 33. Moving contact; 34. Corrugated expansion tube; 35. Flexible component; 36. Triggering component; 361. Oil bladder; 362. Perforation; 363. Rubber hose; 364. Hollow block; 37. Insulating cover; 371. Pressure block; 38. Trigger switch; 39. Movable rod; 4. Disconnect switch; 5. Connector; 51. Anti-pull mechanism; 511. Cover plate; 512. U-shaped frame; 513. Sleeve; 514. Elastic pressure plate; 515. Fixing tube; 6. Protective mechanism; 61. Top plate; 62. Extension frame; 63. Protective cloth; 64. Counterweight frame; 65. Column; 66. Drive assembly; 661. First gear; 662. Second gear; 663. Shaft; 664. Steel wire rope; 665. Drive motor; 67. Protective cover; 7. Operating mechanism; 71. Connecting rod; 72. Swing arm; 73. Movable shaft; 74. Operating lever; 75. Limiting assembly; 751. Arc block; 752. Limiting hole; 753. Limiting block; 754. Return spring; 755. Hole and slot; 756. Slider; 757. Stop block; 8. Hanging rings; 9. Fixture. Detailed Implementation

[0020] 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 a part of the embodiments of the present invention, and not all of them. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. 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.

[0021] Please see Figures 1-9This invention discloses a pole-mounted circuit breaker with mechanical self-locking, comprising: a mechanical housing 1, on which a circuit breaker 3 is mounted, and the mechanical housing 1 is used to control the on / off state of the circuit breaker 3. A knife switch 4 is mounted on one side of the circuit breaker 3. A mounting bracket 9 is welded and fixed to one side of the mechanical housing 1. A connector 5 is mounted on the side of the mounting bracket 9 away from the circuit breaker 3, the connector 5 being used to connect a power line, and the knife switch 4 being used to isolate or close the circuit breaker 3 from the connector 5 on the mounting bracket 9. An operating mechanism 7 for operating the knife switch 4 is mounted on the mounting bracket 9. The circuit breaker 3 includes an insulating housing 31. A stationary contact 32 is welded and fixed to the top of the insulating housing 31. A connector 5 is welded and fixed to the top of the stationary contact 32. A corrugated expansion tube 34 is embedded and fixed to the bottom of the insulating housing 31. A moving contact 33 is embedded and fixed to the center of the corrugated expansion tube 34. A movable rod 39 is movably installed at the bottom of the moving contact 33 through a groove. The movable rod 39 has an inverted T-shaped cross-section. An elastic component 35, which is a spring, is welded and fixed between the movable rod 39 and the moving contact 33. An insulating cover 37 is welded and fixed to the outside of the movable rod 39. The insulating cover 37 is movably sleeved on the outside of the moving contact 33. A trigger switch 38 is embedded and fixed to the inner wall of the corrugated expansion tube 34. The trigger switch 38 has two trigger surfaces, upper and lower. A trigger component 36 is installed on the moving contact 33. A pressure block 371 is welded and fixed to the outside of the insulating cover 37. A control box 2 is fixedly installed on one side of the mechanical box 1 by bolts. The control box 2 has a built-in control chip and is electrically connected to the trigger switch 38. The control box 2 is used to receive signals from the trigger switch 38 and is wirelessly connected to the control terminal.

[0022] In practice, during normal use, the mechanical box 1 drives the movable rod 39 to move upward, thus compressing the elastic component 35 to a compressed state. Then, the elastic force pushes the moving contact 33 upward until the moving contact 33 contacts the stationary contact 32. At this time, the elastic component 35 is in a compressed state, and the pressure block 371 presses the bottom surface of the trigger switch 38, so that the control box 2 receives an electrical signal. At this time, the moving contact 33 and the stationary contact 32 are in normal contact. When the mechanical box 1 is jammed, the upward distance of the movable rod 39 becomes smaller, and the pressure block 371 cannot contact the trigger switch 38. At this time, the control box 2 cannot receive an electrical signal, indicating that the moving contact 33 and the stationary contact 32 cannot make contact. The control box 2 then transmits the signal to the control terminal.

[0023] In one embodiment, the trigger assembly 36 includes an oil bladder 361, which is embedded and fixed at the top of the groove of the moving contact 33; a through hole 362 is provided on one side of the moving contact 33; a rubber hose 363 is embedded and fixed outside the oil bladder 361, and the rubber hose 363 extends to the outside of the moving contact 33 through the through hole 362; a hollow block 364 is welded and fixed on the trigger surface of the top of the trigger switch 38, and the bottom surface of the hollow block 364 is a rubber mold; the bottom of the rubber hose 363 is embedded and fixed to the top of the hollow block 364, so that the oil bladder 361, the rubber hose 363 and the hollow block 364 are in a communication state, and the oil bladder 361, the rubber hose 363 and the hollow block 364 are filled with hydraulic oil; when the moving contact 33 is in normal contact with the stationary contact 32, the movable rod 39 presses the oil bladder 361 upward. 61. Pressure causes the hydraulic oil inside the oil bladder 361 to be injected into the hollow block 364 through the rubber hose 363, increasing the internal pressure of the hollow block 364. This causes the rubber diaphragm at the bottom of the hollow block 364 to deform towards the top of the trigger switch 38, squeezing the top of the trigger switch 38 and transmitting an electrical signal to the control box 2. When the moving contact 33 or the stationary contact 32 wears, the elastic component 35 drives the moving contact 33 to move upward to fill the gap. At this time, the pre-tightening force of the elastic component 35 decreases until the movable rod 39 can no longer squeeze the oil bladder 361. At this time, the pre-tightening force of the elastic component 35 can no longer support the normal contact between the moving contact 33 and the stationary contact 32, thus preventing the top of the trigger switch 38 from being squeezed for continuous electrical signal output. When the control box 2 does not receive a signal, it transmits the information to the control terminal, prompting that maintenance is required.

[0024] In one embodiment, the operating mechanism 7 includes a movable shaft 73, which is rotatably mounted in the fixed frame 9 via bearings; an operating rod 74 is fixedly mounted on one end of the movable shaft 73 by bolts, and the operating rod 74 has symmetrically opened round holes at both ends for pulling the operating rod 74 to rotate, and the operating rod 74 is used to rotate the movable shaft 73; a swing arm 72 is welded and fixed to the outside of the movable shaft 73, and a connecting rod 71 is hinged to the top of the swing arm 72; the knife switch 4 is hinged to one side of the circuit breaker 3, and the top of the connecting rod 71 is hinged to the bottom of the knife switch 4; a limiting component 75 for limiting the position of the operating rod 74 is installed on the mechanical housing 1.

[0025] Specifically, the limiting component 75 includes an arc-shaped block 751, which is welded and fixed to the mechanical housing 1; a slot 755 is formed inside the arc-shaped block 751; a limiting hole 752 is formed on the operating rod 74; a slider 756 is slidably installed inside the slot 755, and the slider 756 moves axially along the slot 755; a limiting block 753 is welded and fixed to the slider 756, the end of the limiting block 753 near the operating rod 74 is arc-shaped, and the limiting block 753 cooperates with the limiting hole 752; a return spring 754 is welded and fixed between the slider 756 and the inner wall of the slot 755; a stop 757 is welded and fixed to the arc-shaped block 751, which is used to limit the movement range of the operating rod 74; in use, the operating rod 74 is pulled through the round hole on the operating rod 74, causing the movable shaft 73 to rotate, which drives the knife switch 4 through the swing arm 72 and the connecting rod 71. Rotating around the connection point with circuit breaker 3 controls the opening and closing of disconnector 4. When disconnector 4 moves, it presses the arc-shaped end of limit block 753, causing limit block 753 to press slider 756 to move along the inside of slot 755, thereby pressing return spring 754. This causes limit block 753 to move into slot 755 until limit block 753 is aligned with limit hole 752. At this time, return spring 754 resets, driving limit block 753 to engage inside limit hole 752. At this time, operating rod 74 rotates to its position and is locked by limit block 753 to prevent accidental activation. When operating rod 74 needs to be rotated again, force is applied to drive operating rod 74, and the inner wall of limit hole 752 presses limit block 753 to move back into slot 755. This restores normal rotation of operating rod 74. External force-assisted locking ensures the stability of operating rod 74.

[0026] In one embodiment, an anti-pull mechanism 51 is installed outside the connector 5; the anti-pull mechanism 51 includes a U-shaped frame 512, which is welded and fixed to the fixing frame 9 and the circuit breaker 3, and the U-shaped frame 512 is sleeved on the outside of the connector 5; a cover plate 511 is bolted and fixed to the outside of the U-shaped frame 512, which makes the U-shaped frame 512 form a relatively closed structure to protect the connector 5; a fixing tube 515 is embedded and fixed on the U-shaped frame 512; a plurality of elastic pressure plates 514 are welded and fixed at equal intervals to the end of the fixing tube 515 away from the U-shaped frame 512; a sleeve 513 is threaded and sleeved on the outside of the fixing tube 515, wherein the sleeve 513 is composed of a straight tube section and a frustum tube section welded together, and the inner side of the frustum tube section away from the U-shaped frame 512 is tightly attached to the elastic pressure plate. The outer surface of the elastic pressure plate 514; during use, the power cord is passed through the elastic pressure plate 514 and the fixing tube 515, and then the power cord is connected and fixed to the connector 5. Then, the sleeve 513 is rotated so that the sleeve 513 moves axially along the fixing tube 515. The frustum tube of the sleeve 513 squeezes the outer surface of the elastic pressure plate 514. At this time, the elastic pressure plate 514 deforms and squeezes the outer surface of the power cord, thus increasing the fixing points of the power cord. When the power cord is pulled, the pulling force acts on the contact surface between the elastic pressure plate 514 and the power cord, reducing the impact of the pulling force on the connection between the power cord and the connector 5, and preventing poor contact due to pulling. At the same time, the cover plate 511 covers the connection, so that the U-shaped frame 512 forms a relatively closed space, reducing the impact of the external environment on the connection point between the connector 5 and the power cord.

[0027] In one embodiment, a protective mechanism 6 is installed on the top of the machine housing 1; the protective mechanism 6 includes a column 65, which is welded and fixed to the top of the machine housing 1, and at least two columns 65 are provided; a top plate 61 is welded and fixed to the top of the column 65, and an extension frame 62 is welded and fixed to the bottom of the top plate 61, with a gap between the extension frame 62 and the top plate 61 for wiring; a protective cloth 63 is glued and fixed to the bottom of the extension frame 62, and the protective cloth 63 is in a folded state; a counterweight frame 64 is glued and fixed to the bottom of the protective cloth 63, and the counterweight frame 64 is movably sleeved on the outside of the column 65; a drive assembly 66 for driving the counterweight frame 64 to move is installed on the top of the top plate 61.

[0028] Specifically, the drive assembly 66 includes a protective cover 67, which is bolted to the top of the top plate 61; a rotating shaft 663 is rotatably mounted inside the protective cover 67 via bearings; a first gear 661 is bolted to the outside of the rotating shaft 663; a drive motor 665 is bolted to the top of the top plate 61, located inside the protective cover 67; a second gear 662 is fixedly mounted at the output end of the drive motor 665 via a coupling, the second gear 662 meshes with the first gear 661, and the drive motor 665 drives the first gear 661 to rotate via the second gear 662, thereby driving the rotating shaft 663 to rotate; and a second gear 662 is bolted to the top of the top plate 61 via bolts. Each end is wound with a steel wire rope 664. The bottom of the steel wire rope 664 moves through the top plate 61 and is then wound and fixed to the top of the counterweight frame 64. In the event of extreme weather, the drive motor 665 drives the first gear 661 to rotate through the second gear 662, causing the shaft 663 to rotate. This causes the steel wire rope 664 wound around the outside of the shaft 663 to loosen, and the counterweight frame 64 moves down under the action of gravity, causing the protective cloth 63 to unfold and cover the outside of the pole-mounted circuit breaker to achieve the protective function. After use, the drive motor 665 rotates in the opposite direction, and the shaft 663 winds the steel wire rope 664 around the outside of the shaft 663, pulling the counterweight frame 64 up, causing the protective cloth 63 to be squeezed, folded and stored.

[0029] In one embodiment, four lifting rings 8 are welded and fixed to the top of the machine box 1, and are respectively installed at the four corners of the top of the machine box 1 for lifting and installing the machine box 1.

[0030] Working principle: The movable rod 39 is the bottom extension of the moving contact 33. The mechanical box 1 drives the moving contact 33 to move, which is existing technology and will not be described in detail. Under normal closing conditions, the mechanical box 1 drives the movable rod 39 to move upward, squeezing the elastic component 35 into a compressed state. The elastic force of the elastic component 35 pushes the moving contact 33 to move upward along the inside of the insulating shell 31. The corrugated telescopic tube 34 embedded in the bottom of the insulating shell 31 expands and contracts with the moving contact 33 to maintain the internal sealing of the circuit breaker 3 until the moving contact 33 contacts the stationary contact 32 to achieve the main circuit conduction. At this time, the pressure block 371 fixed to the outer wall of the insulating cover 37 moves upward synchronously and squeezes the bottom trigger surface of the trigger switch 38. The insulating cover 37 is fixed to the outside of the movable rod 39 and movably sleeved on the outside of the moving contact 33. The trigger switch 38 sends a normal conduction signal to the control box 2, and the control box 2 synchronizes the operating status to the remote control terminal. When mechanical box 1 experiences a transmission jamming fault, the upward stroke of movable rod 39 is insufficient, and pressure block 371 cannot contact the bottom trigger surface of trigger switch 38. Control box 2 does not receive a conduction signal and determines that the main circuit is not properly connected, and then sends a jamming fault alarm to the control terminal. For online monitoring of contact wear, the triggering component 36 built into the moving contact 33 forms a connected hydraulic chamber with the hollow block 364 on the top of the trigger switch 38 through the oil bladder 361, the rubber hose 363, and the hydraulic oil filling the chamber. The rubber hose 363 passes through the perforation 362 on the side wall of the moving contact 33 and connects to the hollow block 364. When the circuit is normally open, the top of the movable rod 39 squeezes the oil bladder 361, and hydraulic oil is injected into the hollow block 364 through the rubber hose 363, causing the bottom rubber diaphragm to deform outward, squeezing the top trigger surface of the trigger switch 38 and outputting a continuous contact signal; when the moving contact 33 or the stationary contact 32 is worn, the pre-tightening force of the elastic component 35 is released to push the moving contact 33 upward to compensate for the wear. After compensation, the movable rod 39 can no longer squeeze the oil bladder 361, and the hydraulic pressure inside the hollow block 364 falls back, causing the rubber diaphragm to reset and disengage from the trigger switch 38. The control box 2 loses the continuous contact signal, which means that the contact pressure of the contact is insufficient, and sends a maintenance warning to the control terminal. In the control and mechanical self-locking link of the knife switch 4, the operating mechanism 7 fixed to the fixed frame 9 uses the movable shaft 73 as the rotation support. When the operating rod 74 is pulled to rotate, the movable shaft 73 drives the swing arm 72 to swing synchronously. Through the connecting rod 71, the knife switch 4 is driven to rotate around the hinge point on the side of the circuit breaker 3, so as to realize the isolation and closure of the circuit between the circuit breaker 3 and the connector 5 on the fixed frame 9. The arc-shaped block 751 of the limiting component 75 is fixed to the side of the mechanical box 1. A slider 756 is slidably installed in the internal slot 755. The limiting block 753 at the end of the slider 756 is kept in the extended state under the action of the return spring 754. When the operating rod 74 is rotated to the position, the limiting hole 752 on its surface is aligned with the limiting block 753. The return spring 754 pushes the limiting block 753 into the limiting hole 752 to complete the mechanical self-locking of the operating rod 74 and prevent accidental contact from changing the state of the knife switch 4. When unlocking is required, an external force is applied to rotate the operating lever 74. The inner wall of the limiting hole 752 presses against the arc-shaped end face of the limiting block 753, which drives the slider 756 to compress the reset spring 754 and return it to the slot 755 to release the lock. The stop 757 at the end of the arc-shaped block 751 is used to limit the extreme rotation angle of the operating lever 74. In terms of terminal protection, the anti-pull mechanism 51 set on the outside of the connector 5 forms a closed protective space by the U-shaped frame 512 and the cover plate 511 to wrap the wiring part. After the power cord passes through the fixed tube 515 and the elastic pressure plate 514 at the end, it is connected to the connector 5. The sleeve 513 is rotated to move along the axial direction of the fixed tube 515. The frustum section of the sleeve 513 squeezes the elastic pressure plate 514 to deform inward and hug the outer sheath of the power cord, transferring the tensile stress on the power cord to the clamping surface of the elastic pressure plate 514, so as to prevent the terminal of the connector 5 from being pulled loose. When the protection is activated in extreme weather, the protection mechanism 6 installed on the top of the mechanical box 1 is put into operation. The drive motor 665 of the drive component 66 meshes with the first gear 661 through the second gear 662, which drives the rotating shaft 663 inside the protective cover 67 to rotate and release the steel wire rope 664. The counterweight frame 64 slides down along the column 65 under the action of gravity, pulling the protective cloth 63 under the extension frame 62 downward to unfold and wrap the circuit breaker on the column to achieve rainproof and impact-proof protection. After the weather recovers, the drive motor 665 reverses, the shaft 663 winds up the steel wire rope 664 to pull the counterweight frame 64 upward, and folds the protective cloth 63 and stores it under the top plate 61 to complete the reset.

[0031] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0032] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0033] Additionally, "multiple" refers to two or more.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A pole-mounted circuit breaker with mechanical self-locking, comprising a mechanical housing (1), wherein a circuit breaker (3) is mounted on the top of the mechanical housing (1), and a knife switch (4) is mounted on one side of the circuit breaker (3); a fixing bracket (9) is fixedly mounted on one side of the mechanical housing (1), and a connector (5) is mounted on the side of the fixing bracket (9) away from the circuit breaker (3), characterized in that, The fixed frame (9) is equipped with an operating mechanism (7) for operating the knife switch (4); The circuit breaker (3) includes an insulating shell (31), a stationary contact (32) is fixedly installed on the top of the insulating shell (31), and a connector (5) is installed on the top of the stationary contact (32); a corrugated expansion tube (34) is installed at the bottom of the insulating shell (31), and a moving contact (33) is fixedly installed at the center of the corrugated expansion tube (34); a groove is provided at the bottom of the moving contact (33), and a movable rod (39) is movably installed in the groove, the cross-section of the movable rod (39) being inverted T-shaped; the movable rod (39) is movably installed in the groove; the movable rod (39) is movably installed in the groove; the movable rod (39) is movably installed in the groove; the movable rod (39) is movably installed in the groove. An elastic component (35) is provided between the rod (39) and the moving contact (33); an insulating cover (37) is fixedly installed on the outside of the moving rod (39), and the insulating cover (37) is movably sleeved on the outside of the moving contact (33); a trigger switch (38) is fixedly installed on the inner wall of the corrugated telescopic tube (34), and the trigger switch (38) has two trigger surfaces, upper and lower; a trigger component (36) is provided on the moving contact (33), and a pressure block (371) is fixedly installed on the outside of the insulating cover (37); A control box (2) is fixedly installed on one side of the mechanical box (1). The control box (2) is electrically connected to the trigger switch (38). The control box (2) is used to receive the detection signal of the trigger switch (38), and the control box (2) is wirelessly connected to an external control terminal.

2. The pole-mounted circuit breaker with mechanical self-locking according to claim 1, characterized in that, The trigger assembly (36) includes an oil bladder (361), which is installed at the top of the groove of the moving contact (33). A perforation (362) is provided on one side of the moving contact (33). A rubber hose (363) is connected to the outside of the oil bladder (361), and the rubber hose (363) extends through the perforation (362) to the outside of the moving contact (33). A hollow block (364) is fixedly installed on the top trigger surface of the trigger switch (38), and the bottom surface of the hollow block (364) is a rubber membrane structure. The bottom of the rubber hose (363) is connected to the top of the hollow block (364), so that the oil bladder (361), the rubber hose (363) and the interior of the hollow block (364) form a communicating cavity, and the communicating cavity is filled with hydraulic oil.

3. The pole-mounted circuit breaker with mechanical self-locking according to claim 1, characterized in that, The operating mechanism (7) includes a movable shaft (73), which is rotatably installed inside the fixed frame (9); an operating rod (74) is fixedly installed at one end of the movable shaft (73), and the two ends of the operating rod (74) are symmetrically provided with round holes for applying force to rotate; a swing arm (72) is fixedly sleeved on the outside of the movable shaft (73), and a connecting rod (71) is hinged to the top of the swing arm (72); the knife switch (4) is hinged to one side of the circuit breaker (3), and the top of the connecting rod (71) is hinged to the bottom of the knife switch (4); a limiting component (75) for limiting the rotation position of the operating rod (74) is installed on the mechanical box (1).

4. The pole-mounted circuit breaker with mechanical self-locking according to claim 3, characterized in that, The limiting component (75) includes an arc-shaped block (751), which is fixedly installed on the mechanical housing (1); an arc-shaped groove (755) is provided inside the arc-shaped block (751); a limiting hole (752) is correspondingly provided on the operating rod (74); a slider (756) is slidably installed in the groove (755), and the slider (756) can reciprocate along the axial direction of the groove (755); a fixed... A limiting block (753) is installed, the end of the limiting block (753) near the operating rod (74) is arc-shaped, and the limiting block (753) is adapted to engage with the limiting hole (752); a return spring (754) is provided between the slider (756) and the inner wall of the slot (755); a stop block (757) is fixedly installed on the arc-shaped block (751), and the stop block (757) is used to limit the extreme rotation range of the operating rod (74).

5. The pole-mounted circuit breaker with mechanical self-locking according to claim 1, characterized in that, The connector (5) is provided with an anti-pull mechanism (51) on its exterior; the anti-pull mechanism (51) includes a U-shaped frame (512), which is fixedly installed on the fixed frame (9) and the circuit breaker (3), and the U-shaped frame (512) is sleeved on the exterior of the connector (5); a cover plate (511) is fixedly installed on the outside of the U-shaped frame (512), and the cover plate (511) and the U-shaped frame (512) enclose a relatively closed protective space; a fixing tube (515) is installed on the U-shaped frame (512); a plurality of elastic pressure plates (514) are fixed equidistantly along the circumference at one end of the fixing tube (515) away from the U-shaped frame (512); a sleeve (513) is sleeved on the outside of the fixing tube (515) by threaded engagement.

6. The pole-mounted circuit breaker with mechanical self-locking according to claim 5, characterized in that, The sleeve (513) is composed of a straight pipe section and a frustum pipe section, with the inner wall of the frustum pipe section away from the U-shaped frame (512) closely attached to the outer surface of the elastic pressure plate (514).

7. The pole-mounted circuit breaker with mechanical self-locking according to claim 1, characterized in that, The top of the machine box (1) is provided with a protective mechanism (6); the protective mechanism (6) includes a column (65), which is fixedly installed on the top of the machine box (1), and there are at least two columns (65); a top plate (61) is fixedly installed on the top of the column (65), and an extension frame (62) is fixedly installed on the bottom surface of the top plate (61), with a gap for wiring between the extension frame (62) and the top plate (61); a protective cloth (63) is fixedly connected to the bottom surface of the extension frame (62), and the protective cloth (63) is normally folded and stored; a counterweight frame (64) is fixedly connected to the bottom end of the protective cloth (63); a drive assembly (66) for driving the counterweight frame (64) to rise and fall along the column is installed on the top of the top plate (61).

8. The pole-mounted circuit breaker with mechanical self-locking according to claim 7, characterized in that, The drive assembly (66) includes a protective cover (67), which is fixedly installed on the top of the top plate (61); a rotating shaft (663) is rotatably installed inside the protective cover (67); a first gear (661) is fixedly sleeved on the outside of the rotating shaft (663); a drive motor (665) is fixedly installed on the top of the top plate (61), and the drive motor (665) is located inside the protective cover (67); the output end of the drive motor (665) is fixedly installed... The device is equipped with a second gear (662), which meshes with the first gear (661). The drive motor (665) drives the first gear (661) to rotate through the second gear (662), thereby driving the rotating shaft (663) to rotate synchronously. Both ends of the rotating shaft (663) are wound with steel wire ropes (664). The bottom end of the steel wire ropes (664) passes through the top plate (61) and is then wound and fixed to the top of the counterweight frame (64).

9. The pole-mounted circuit breaker with mechanical self-locking according to claim 7, characterized in that, The counterweight frame (64) is movably sleeved on the outside of the column (65), and the column (65) is used to guide the lifting and lowering movement of the counterweight frame (64).

10. The pole-mounted circuit breaker with mechanical self-locking according to claim 1, characterized in that, The top of the machine box (1) is fixedly equipped with lifting rings (8). There are four lifting rings (8) in total, which are respectively arranged at the four corners of the top of the machine box (1).

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