High-voltage switch cabinet with handcart self-locking structure

Abstract

The application belongs to the technical field of high-voltage switch cabinets, and particularly relates to a high-voltage switch cabinet with a handcart self-locking structure; the application comprises a cabinet body, the cabinet body is sequentially provided with an instrument room, a circuit breaker room and a cable room from top to bottom, a circuit breaker trolley capable of being pushed and pulled is connected in the circuit breaker room, a movable locking frame and a threaded rod for driving the locking frame to move are installed on the circuit breaker trolley, a plurality of moving contacts are fixedly connected on the circuit breaker trolley, and a static contact in contact with the moving contacts is arranged in the circuit breaker room; a locking mechanism is installed on the circuit breaker trolley, the locking mechanism comprises a rotating rod and profile gears fixedly connected at both ends of the rotating rod; a clamping mechanism matched with the locking mechanism is installed in the circuit breaker room; through linkage cooperation of the locking mechanism and the limiting mechanism, the circuit breaker trolley is prevented from being incompletely pushed into the circuit breaker room, and personnel are prevented from misoperating to perform a closing operation, so that personnel safety is ensured.

Description

Technical Field

[0001] This invention relates to the field of high-voltage switchgear technology, and in particular to high-voltage switchgear with a self-locking handcart structure. Background Technology

[0002] Switchgear is one of the most important pieces of equipment in substations, undertaking the power distribution tasks for important loads in various regions. High-voltage switchgear equipment is frequently used and widely distributed in the power grid. Switchgear can be classified in many ways, such as by the circuit breaker installation method (removable switchgear and fixed switchgear); or according to the cabinet structure (open switchgear, metal-enclosed switchgear, metal-enclosed armored switchgear); and according to voltage level (high-voltage switchgear, medium-voltage switchgear, and low-voltage switchgear), etc.

[0003] As a core piece of equipment in the power system, the design of the self-locking structure of the high-voltage switchgear is directly related to operational safety and equipment reliability. Traditional designs have several key drawbacks: closing operations can be performed even if the switchgear is not fully pushed into the designated position inside the circuit breaker room, which can easily lead to accidents due to operational errors; significant safety hazards exist: the lack of a mandatory interlocking mechanism means that personnel can accidentally pull the switchgear out without opening the circuit breaker, posing a safety hazard. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a high-voltage switchgear with a self-locking mechanism for the handcart. Through the cooperation of a locking mechanism and a limiting mechanism, it aims to resolve the safety hazards described in the background section. To achieve the above-mentioned technical objectives, the specific technical solution of the present invention is as follows: The high-voltage switchgear with a self-locking structure proposed in this invention includes a cabinet, which, from top to bottom, comprises an instrument compartment, a circuit breaker compartment, and a cable compartment. A push-pull circuit breaker trolley is connected to the circuit breaker compartment. A movable locking frame and a threaded rod for driving the locking frame are installed on the circuit breaker trolley. Multiple moving contacts are fixedly connected to the circuit breaker trolley, and a stationary contact that engages with the moving contacts is provided inside the circuit breaker compartment. A locking mechanism is installed on the circuit breaker trolley to lock the circuit breaker trolley inside the circuit breaker compartment. The locking mechanism includes a rotating rod and shaped gears fixedly connected to both ends of the rotating rod. A locking mechanism that engages with the locking mechanism is installed inside the circuit breaker compartment. The locking mechanism includes a pair of mounting brackets fixedly installed on the inner wall of the circuit breaker compartment and a locking plate fixedly connected to the mounting brackets. The locking plate has several slots that engage with the shaped gears.

[0005] As a preferred embodiment of the present invention, the locking frame is equipped with a limiting mechanism that is linked to the locking mechanism on both sides for limiting the locking frame. A pair of guide frames are fixedly connected to the circuit breaker trolley, and the locking frame is slidably connected to the guide frames.

[0006] As a preferred embodiment of the present invention, the limiting mechanism includes a lever rotatably connected to the side of the guide frame and a slider that can move up and down on the guide frame. The guide frame is provided with a sliding hole that is slidably connected to the slider. A baffle for blocking the locking frame is fixedly connected to the slider. When the lever rotates, it drives the baffle to move up and down.

[0007] As a preferred embodiment of the present invention, a handle is fixedly connected to the rotating rod, a push rod is rotatably connected between the handle and the lever, and a connecting rod is rotatably connected between the lever and the slider.

[0008] As a preferred embodiment of the present invention, the slider is provided with a groove, and the locking frame is provided with a stop block that can be inserted into the groove, the stop block being used to block the top of the slider.

[0009] As a preferred embodiment of the present invention, a tension spring rod is fixedly connected to the surface of the rotating rod, and a tension spring is fixedly connected between the tension spring rod and the circuit breaker trolley.

[0010] As a preferred embodiment of the present invention, a guide rail is fixedly connected to the surface of the mounting bracket, and a slide block that is slidably connected to the guide rail is fixedly connected to the side of the circuit breaker trolley.

[0011] As a preferred embodiment of the present invention, a lifting limit plate is connected between the two mounting brackets to limit the movement of the circuit breaker trolley. A vertical rod is fixedly connected to the mounting bracket, and both ends of the limit plate are fixedly connected to the vertical rod.

[0012] The beneficial effects of this invention are as follows: 1. This invention utilizes the linkage between the locking mechanism and the limiting mechanism. When the circuit breaker trolley is fully pushed into the circuit breaker chamber, the baffle on the limiting mechanism descends, no longer obstructing the locking frame. The locking frame moves through the rotation of the threaded rod, thus performing the closing action. This avoids accidental closing by personnel when the circuit breaker trolley is not fully pushed into the circuit breaker chamber.

[0013] 2. This invention utilizes the cooperation between the slider and the stop block on the limiting mechanism. After the circuit breaker is closed, the stop block limits the slider, thereby locking and fixing the rotating rod. This prevents the circuit breaker trolley from being accidentally operated by personnel when the circuit breaker is closed. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the high-voltage switchgear of the present invention.

[0015] Figure 2 This is a schematic diagram of the circuit breaker trolley proposed in this invention.

[0016] Figure 3 for Figure 2 Another perspective diagram.

[0017] Figure 4 This is a schematic diagram of the locking frame proposed in this invention.

[0018] Figure 5 for Figure 4 Another perspective diagram.

[0019] Figure 6 for Figure 4 A schematic diagram of the layout structure.

[0020] Figure 7 This is a schematic diagram of the engaging mechanism proposed in this invention.

[0021] The corresponding names of the attached figures are as follows: 1. Cabinet; 2. Instrument Room; 3. Cable Room; 4. Circuit Breaker Room; 5. Circuit Breaker Trolley; 51. Locking Frame; 52. Limiting Mechanism; 521. Slider; 522. Baffle; 523. Groove; 524. Lever; 525. Connecting Rod; 526. Sliding Hole; 527. Push Rod; 53. Locking Mechanism; 531. Rotating Rod; 532. Special Gear; 533. Handle Rod; 534. Tension Spring Rod; 535. Tension Spring; 54. Moving Contact; 55. Guide Frame; 56. Threaded Rod; 57. Slide Seat; 58. Stop Block; 6. Engaging Mechanism; 61. Mounting Frame; 62. Guide Rail; 63. Card Plate; 65. Card Slot; 66. Vertical Rod; 67. Limiting Plate; 7. Stationary Contact. Detailed Implementation

[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0023] Example: This example discloses a high-voltage switchgear with a self-locking structure for handcarts, such as... Figures 1-7 As shown, the device includes a cabinet 1, which, from top to bottom, contains an instrument compartment 2, a circuit breaker compartment 4, and a cable compartment 3. The instrument compartment 2 is used to install instruments and electronic devices, the cable compartment 3 is used for cable routing, and the circuit breaker compartment 4 is connected to a push-pull circuit breaker trolley 5. The circuit breaker trolley 5 is equipped with a movable locking frame 51 and a threaded rod 56 for driving the locking frame 51. The locking frame 51 is equipped with a threaded block that is threadedly connected to the threaded rod 56. Multiple moving contacts 54 are fixedly connected to the circuit breaker trolley 5, and the circuit breaker compartment 4 is equipped with stationary contacts 7 that contact and cooperate with the moving contacts 54. When the circuit breaker trolley 5 is fully pushed into the circuit breaker compartment 4, the threaded rod 56 is rotated to drive the locking frame 51 to move, thereby making the moving contacts 54 contact the stationary contacts 7, completing the closing action.

[0024] like Figures 2-4 and Figure 7As shown, a locking mechanism 53 is installed on the circuit breaker trolley 5 to lock the circuit breaker trolley 5 inside the circuit breaker compartment 4, ensuring the stability of the circuit breaker trolley 5 inside the circuit breaker compartment 4. The locking mechanism 53 includes a rotating rod 531 and a special-shaped gear 532 fixedly connected to both ends of the rotating rod 531. The rotating rod 531 is rotatably connected to the circuit breaker trolley 5. The special-shaped gear 532 has a fan-shaped structure with multiple evenly distributed teeth on its outer edge. A locking mechanism 6 that cooperates with the locking mechanism 53 is installed inside the circuit breaker compartment 4. The locking mechanism 6 includes a pair of mounting brackets 61 fixedly installed on the inner wall of the circuit breaker compartment 4, and a fixed connection. A clamping plate 63 is attached to the mounting bracket 61. The clamping plate 63 has several slots 65 that mate with the shaped gear 532. The clamping plate 63 is positioned above the shaped gear 532. When the circuit breaker trolley 5 is pushed into the circuit breaker chamber 4, the shaped gear 532 will contact the clamping plate 63. As the circuit breaker trolley 5 moves deeper into the circuit breaker chamber 4, the clamping plate 63 drives the shaped gear 532 to rotate, thereby generating mechanical meshing feedback and producing a clicking sound. The shaped gear 532 rotates until the teeth are facing upwards, which in turn drives the rotating rod 531 to rotate, and the shaped gear 532 engages with the clamping plate 63.

[0025] like Figures 5-6As shown, the locking frame 51 is equipped with limiting mechanisms 52 that are linked to the locking mechanism 53 on both sides. These mechanisms limit the locking frame 51, that is, physically blocking the closing movement path of the locking frame under prohibited conditions, thus preventing the locking frame 51 from moving. A pair of guide frames 55 are fixedly connected to the circuit breaker trolley 5, and the locking frame 51 is slidably connected to the guide frames 55. The limiting mechanism 52 includes a lever 524 rotatably connected to the side of the guide frame 55 and a slider 521 that can rise and fall on the guide frame 55. The guide frame 55 is provided with a sliding hole 526 that is slidably connected to the slider 521. A baffle 522 for blocking the locking frame 51 is fixedly connected to the slider 521. When the lever 524 rotates, it drives the baffle 522 to rise and fall. A handle 533 is fixedly connected to the rotating rod 531. A push rod 527 is rotatably connected between the handle 533 and the lever 524. The lever 524 and the slider 521 rotate... The circuit breaker trolley 5 is connected by a connecting rod 525. As the circuit breaker trolley 5 moves deeper into the circuit breaker chamber 4, the locking plate 63 drives the special gear 532 to rotate, which in turn drives the rotating rod 531 to rotate. When the rotating rod 531 rotates, it drives the lever 524 to rotate, which in turn drives the slider 521 and the baffle 522 to descend. When the circuit breaker trolley 5 is fully pushed into the circuit breaker chamber 4, the baffle 522 descends to below the locking frame 51 and no longer obstructs the locking frame 51. At this time, the locking frame 51 can be moved by rotating the threaded rod 56, so that the moving contact 54 contacts the stationary contact 7, completing the closing action. In this embodiment, through the design of the limiting mechanism 52 and the locking mechanism 53, when the circuit breaker trolley 5 is not fully pushed into the circuit breaker chamber 4, the locking frame 51 is blocked by the baffle 522. At this time, the closing action cannot be performed, thus avoiding the phenomenon that the circuit breaker trolley 5 closes before it has moved into position.

[0026] Furthermore, the slider 521 is provided with a groove 523, and the locking frame 51 is provided with a stop 58 that cooperates with the groove 523. The stop 58 can be inserted into the groove 523 and is used to block the slider 521 from above. When the closing is completed, the stop 58 is inserted into the groove 523 and is located above the slider 521, thereby restricting the slider 521 from moving upward. At this time, the equipment is in the closed state, and the baffle 522 and the slider 521 cannot rise. That is, the rotating rod 531 and the special gear 532 are in the locked state and cannot be rotated. At this time, it is necessary to first rotate the threaded rod 56 to drive the locking frame 51 to move in the opposite direction to open the circuit breaker and pull the circuit breaker trolley 5 out of the circuit breaker chamber 4. This avoids the problem of personnel accidentally moving the circuit breaker trolley 5 out of the circuit breaker chamber 4 when the circuit breaker is in the closed state.

[0027] Furthermore, a tension spring rod 534 is fixedly connected to the surface of the rotating rod 531, and a tension spring 535 is fixedly connected between the tension spring rod 534 and the circuit breaker trolley 5; the tension spring 535 applies tension to the rotating rod 531, so that after the circuit breaker trolley 5 moves out of the circuit breaker chamber 4, the rotating rod 531 and the special gear 532 rotate to their original positions so that the special gear 532 can engage with the clamping plate 63 next time.

[0028] like Figure 7 As shown, a guide rail 62 is fixedly connected to the surface of the mounting bracket 61, and a slide block 57 that is slidably connected to the guide rail 62 is fixedly connected to the side of the circuit breaker trolley 5. A lifting limit plate 67 is connected between the two mounting brackets 61 to limit the circuit breaker trolley 5. When the rear end of the circuit breaker trolley 5 contacts the limit plate 67, the circuit breaker trolley 5 stops moving. A vertical rod 66 is fixedly connected to the mounting bracket 61. The two ends of the limit plate 67 are adjustablely connected to the vertical rod 66 through nuts. The height of the limit plate 67 can be adjusted. The nuts are threadedly connected to the vertical rod 66. The two ends of the limit plate 67 are provided with rod sleeves that are slidably connected to the vertical rod 66. The two nuts limit the upper and lower ends of the rod sleeves. The adjustment method is to loosen the nuts with a wrench, move the limit plate 67 up and down along the vertical rod 66 to the designated position, and then tighten the nuts.

[0029] Working principle: When the circuit breaker trolley 5 is pushed into the circuit breaker chamber 4, the shaped gear 532 will contact the clamping plate 63. As the circuit breaker trolley 5 moves deeper into the circuit breaker chamber 4, the shaped gear 532 and the clamping plate 63 engage. The clamping plate 63 drives the shaped gear 532 to rotate, which in turn drives the rotating rod 531 to rotate. When the rotating rod 531 rotates, it drives the lever 524 to rotate, which in turn drives the slider 521 and the baffle 522 to descend. When the circuit breaker trolley 5 is completely pushed into the circuit breaker chamber 4, the baffle 522 descends to below the locking frame 51 and no longer obstructs the locking frame 51. At this time, the locking frame 51 can be moved by rotating the threaded rod 56, so that the moving contact 54 contacts the stationary contact 7, completing the process. The circuit breaker trolley 5 is not fully pushed into the circuit breaker chamber 4. When the trolley 5 is not fully pushed into the circuit breaker chamber 4, the locking frame 51 is blocked by the baffle 522. At this time, the closing action cannot be performed, thus avoiding the phenomenon of closing the circuit breaker trolley 5 before it is in place. When the equipment is in the closed state, the baffle 522 and the slider 521 are blocked by the stop block 58 and cannot rise. That is, the rotating rod 531 and the special gear 532 are locked and cannot rotate. At this time, the threaded rod 56 needs to be rotated first to drive the locking frame 51 to move in the opposite direction to open the circuit breaker. Only then can the circuit breaker trolley 5 be pulled out of the circuit breaker chamber 4. This avoids the problem of personnel accidentally moving the circuit breaker trolley 5 out of the circuit breaker chamber 4 when the circuit breaker is in the closed state, thus ensuring personnel safety.

[0030] Finally, it should be noted that in the description of this invention, the terms "vertical," "upper," "lower," "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0031] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. 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 high-voltage switchgear with a self-locking mechanism for handcarts, comprising a cabinet (1), wherein the cabinet (1) is provided with an instrument compartment (2), a circuit breaker compartment (4), and a cable compartment (3) from top to bottom, characterized in that, The circuit breaker compartment (4) is connected to a push-pull circuit breaker trolley (5). The circuit breaker trolley (5) is equipped with a movable locking frame (51) and a threaded rod (56) for driving the locking frame (51) to move. Multiple moving contacts (54) are fixedly connected to the circuit breaker trolley (5). The circuit breaker compartment (4) is provided with stationary contacts (7) that are in contact with the moving contacts (54). The circuit breaker trolley (5) is equipped with a locking mechanism (53) for locking the circuit breaker trolley (5) inside the circuit breaker compartment (4). The locking mechanism (53) includes a rotating rod (531) and a special gear (532) fixedly connected to both ends of the rotating rod (531). The circuit breaker compartment (4) is equipped with a locking mechanism (6) that cooperates with the locking mechanism (53). The locking mechanism (6) includes a pair of mounting brackets (61) fixedly installed on the inner wall of the circuit breaker compartment (4) and a locking plate (63) fixedly connected to the mounting brackets (61). The locking plate (63) is provided with a number of slots (65) that cooperate with the special gear (532). The locking frame (51) is equipped with a limiting mechanism (52) that is linked to the locking mechanism (53) on both sides, which is used to limit the locking frame (51). A pair of guide frames (55) are fixedly connected on the circuit breaker trolley (5), and the locking frame (51) and the guide frames (55) are slidably connected. The limiting mechanism (52) includes a lever (524) rotatably connected to the side of the guide frame (55) and a slider (521) that can move up and down on the guide frame (55). The guide frame (55) is provided with a sliding hole (526) that is slidably connected to the slider (521). A baffle (522) for blocking the locking frame (51) is fixedly connected to the slider (521). When the lever (524) rotates, it drives the baffle (522) to move up and down. When the rotating rod (531) rotates, it drives the lever (524) to rotate, thereby driving the slider (521) and the baffle (522) to descend. The slider (521) is provided with a groove (523), and the locking frame (51) is provided with a stop (58) that can be inserted into the groove (523). The stop (58) is used to block the top of the slider (521).

2. The high-voltage switchgear with a self-locking mechanism for handcarts according to claim 1, characterized in that, A handle (533) is fixedly connected to the rotating rod (531), a push rod (527) is rotatably connected between the handle (533) and the lever (524), and a connecting rod (525) is rotatably connected between the lever (524) and the slider (521).

3. The high-voltage switchgear with a self-locking handcart structure according to claim 1, characterized in that, A tension spring rod (534) is fixedly connected to the surface of the rotating rod (531), and a tension spring (535) is fixedly connected between the tension spring rod (534) and the circuit breaker trolley (5).

4. The high-voltage switchgear with a self-locking mechanism for handcarts according to claim 1, characterized in that, The mounting bracket (61) is fixedly connected to a guide rail (62), and the circuit breaker trolley (5) is fixedly connected to a slide block (57) that is slidably connected to the guide rail (62).

5. The high-voltage switchgear with a self-locking mechanism for a handcart as described in claim 1 or 4, characterized in that, A lifting limit plate (67) is connected between the two mounting brackets (61) to limit the circuit breaker trolley (5). A vertical rod (66) is fixedly connected to the mounting bracket (61). The two ends of the limit plate (67) are adjustablely connected to the vertical rod (66) through nuts.

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