Mechanical locking device for working positions of electric grounding switch and handcart

Abstract

The invention relates to a mechanical locking device for working positions of an electric grounding switch and a handcart, which comprises an extended pressing plate fixedly connected to a chassis of the handcart, a steering stop block fixedly connected to a grounding interlocking large shaft, a mounting frame fixedly connected in a switch cabinet and a steering baffle plate hinged to the mounting frame, when the handcart is rocked to a working position, the steering baffle plate is pushed to swing through the extension pressing plate, so that the steering baffle plate swings to a swing path of the steering baffle plate when the handcart is switched on, and when the handcart is rocked out of the working position, the grounding interlocking large shaft drives the steering baffle plate to swing towards one side. The anti-misoperation switch cabinet has the advantages that the anti-misoperation capability of the switch cabinet is enhanced, the operation safety of equipment is improved, the structure is simple, the action is reliable, an additional power source is not needed, the maintenance is convenient, the defect that the switch cabinet purely depends on electrical interlocking in the prior art is effectively overcome, and the safety of the switch cabinet is improved. And a dual protection mechanism is provided for the high-voltage switch cabinet.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of switch cabinet, in particular to a mechanical locking device for electric grounding switch and handcart working position. BACKGROUND

[0002] 10kV high-voltage switch cabinet is a complete switch control device widely used in power system, and its safety is crucial, especially for the switch cabinet with grounding switch. At present, the manual operation of grounding switch has generally adopted mechanical interlocking structure, which can effectively prevent the misoperation of grounding switch when the handcart is in non-test position, such as through the ways of shutter locking and operation handle insertion hole shielding. However, for the electric operation of grounding switch, the existing technology only relies on electrical interlocking as the anti-misoperation measure. The electrical interlocking realizes the interlocking of handcart position and electric operation of grounding switch through control circuit, but its reliability is affected by electrical elements, lines and control logic state. Once the failure conditions such as relay failure, loose wiring or abnormal control power supply occur, the electrical interlocking will lose its protection effect. At this time, if the handcart is in working position (i.e. the main circuit is in live state), the operator remotely or locally electrically closes the grounding switch, which will cause live grounding fault, and may cause serious accidents such as equipment short circuit, arc ablation, system trip and even personnel injury. There is no mature structure in the market that can realize mechanical locking for electric operation of grounding switch when the handcart is in working position, and this technical defect has become a hidden danger for safe operation of switch cabinet. SUMMARY

[0003] The present application provides a mechanical locking device for electric grounding switch and handcart working position, which increases mechanical interlocking to make the handcart and grounding interlocking large shaft generate locking condition, and the handcart working position controls the rotation of grounding interlocking large shaft blocked by mechanical interlocking.

[0004] The present application is realized by the following technical scheme, which provides a mechanical locking device for electric grounding switch and handcart working position, including an extension pressure plate fixed on the handcart chassis, a steering block fixed on the grounding interlocking large shaft, a mounting frame fixed in the switch cabinet and a steering baffle hinged on the mounting frame. When closing, the grounding interlocking large shaft drives the steering block to swing to one side, and further including a reset tension spring connected with the steering baffle. When the handcart is rocked into working position, the extension pressure plate pushes the steering baffle to swing, so that the steering baffle swings to the swing path of the steering block when closing. After the handcart is rocked out of working position, the steering baffle leaves the swing path of the steering block under the tension of the reset tension spring.

[0005] The trolley of the scheme is in the test position, and the steering baffle is away from the swing path of the steering block under the tension of the reset tension spring. At this time, the manual or electric switch can be normally used, and the motor and the grounding interlock can be normally rotated. When the trolley is rocked into the working position, the trolley chassis is rocked forward, the extension pressure plate touches the steering baffle, and the steering baffle swings to the swing path of the steering block when the baffle is closed. At this time, when the grounding switch is closed, the motor drives the grounding interlock shaft and the steering block to rotate, and the steering block is blocked by the steering baffle. Therefore, the closing operation cannot be performed.

[0006] As an optimization, the extension pressure plate is fixed to the front end of the trolley chassis by bolts. In the scheme, the steering baffle is pushed forward by being rocked forward, and the height space is not occupied. The length of the extension pressure plate can be replaced and adjusted according to the length of the chassis through bolt connection.

[0007] As an optimization, the mounting frame includes a transverse reinforcing plate and two steering baffle support plates fixed to the reinforcing plate, and the steering baffle is located between the two steering baffle support plates. The steering baffle is hinged to the mounting frame by bolts penetrating the steering baffle and the two steering baffle support plates. In the scheme, the hinging of the steering baffle is realized by the two steering baffle support plates.

[0008] As an optimization, the upper end of the steering baffle penetrates the reinforcing plate. In the scheme, the upper end of the steering baffle penetrates the reinforcing plate, so that the steering baffle is located below the reinforcing plate, improving the connection strength between the steering baffle and the reinforcing plate.

[0009] As an optimization, the upper and lower ends of the steering baffle swing in opposite directions, the extension pressure plate pushes the upper end of the steering baffle to swing, and the lower end of the steering baffle swings to the swing path of the steering block when the baffle is closed. In the scheme, the upper and lower ends of the steering baffle swing in opposite directions, the upper end is used to contact the extension pressure plate, and the lower end is used to contact the steering block, which is convenient for space arrangement inside the switch cabinet.

[0010] As an optimization, the upper end of the steering baffle is inclined forward. Thus, the extension pressure plate pushes the steering baffle forward.

[0011] As an optimization, the swing plane of the steering baffle is perpendicular to the swing plane of the steering block. Thus, the swing direction of the steering block is perpendicular to the swing direction of the steering baffle, which plays a better stopping role.

[0012] As an optimization, the mounting frame is fixed to the intermediate partition plate inside the switch cabinet by bolts. Thus, the mounting frame is fixed.

[0013] As an optimization, one end of the reset tension spring is connected to the lower end of the steering baffle, and the other end is connected to the switch cabinet. Thus, the lower end of the steering baffle is swung by the reset tension spring.

[0014] The beneficial effects of the present application are: the mechanical interlocking device of the electric ground switch and the handcart working position of the present application realizes the rigid mechanical interlocking between the handcart working position and the electric operation of the ground switch through the innovative mechanical structure design, and fundamentally eliminates the risk of misoperation caused by the failure of the electrical interlocking. The device uses components such as the extended pressing plate fixed on the handcart chassis, the turning block installed on the ground interlocking large shaft, and the turning baffle hinged in the cabinet, when the handcart is rocked into the working position, the turning baffle is automatically cut into the closing swing path of the turning block through mechanical linkage, forming a physical barrier. When the electrical interlocking is abnormal and the closing instruction of the ground switch is issued, the turning block is mechanically blocked by the turning baffle, the ground interlocking large shaft cannot rotate, and then the motor is blocked, triggering the controller to alarm and cut off the operation, so that the closing operation cannot be performed. After the handcart is withdrawn from the working position to the test position, the turning baffle is automatically reset under the action of the reset spring, the interference to the turning block is removed, and the manual and electric operation of the ground switch can be normally performed. The structure not only enhances the anti-misoperation ability of the switch cabinet and improves the safety of the equipment operation, but also is simple in structure, reliable in action, does not need additional power source, is convenient to maintain, effectively makes up for the deficiency of the existing technology which simply relies on electrical interlocking, and provides a double protection mechanism for high-voltage switch cabinets. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a side view of the present application; Figure 2 is a structural schematic view of the present application; Figure 3 is a structural schematic view of the present application from another angle; Figure 4 is a schematic view of the present application when the extended pressing plate just contacts the turning baffle; Figure 5 is a lower schematic view of the present application after the extended pressing plate presses down the turning baffle; Figure 6 is an upper schematic view of the present application after the extended pressing plate presses down the turning baffle; In the drawings: 1, handcart chassis, 2, extended pressing plate, 3, reinforced lining plate, 4, ground interlocking large shaft, 5, turning baffle support plate, 6, turning block, 7, turning baffle, 8, reset spring. DETAILED DESCRIPTION

[0016] In order to clearly illustrate the technical features of the present application, the present application will be described below through specific embodiments.

[0017] As Figures 1-6As shown, the present invention provides a mechanical interlocking device for the working position of an electric grounding switch and a handcart, comprising an extension pressure plate 2 fixed to the handcart chassis 1, a steering block 6 fixed to the grounding interlocking shaft 4, a mounting bracket fixed to the switch cabinet, and a steering baffle 7 hinged to the mounting bracket.

[0018] like Figure 6 As shown, the extension pressure plate 2 is a U-shaped plate with an upper opening. One of its vertical plates is fixed to the front end of the handcart chassis 1 by bolts. The handcart chassis 1 is the main component of the handcart. The overall height of the extension pressure plate 2 is less than or equal to the height of the handcart chassis 1. Specifically, the upper end of the extension pressure plate 2 is lower than or equal to the upper end of the handcart chassis 1, and the lower end of the extension pressure plate 2 is higher than or equal to the lower end of the handcart chassis 1.

[0019] The extension plate 2 is connected by bolts, so that the length of the extension plate 2 can be changed and adjusted according to the length of the chassis vehicle.

[0020] The grounding interlock shaft 4 is a rotating shaft used to perform grounding operations. The shaft extends forward and backward, typically located on one side below the handcart. Grounding is achieved by rotating the grounding interlock shaft 4 to one side via a motor. The steering block 6 is elongated, with one end fixedly connected to the grounding interlock shaft 4 (the connection method is not limited and can include welding, bolting, or sleeve connection), and the other end swinging as the grounding interlock shaft 4 rotates. When the circuit is closed, the grounding interlock shaft 4 drives the steering block 6 to swing to one side.

[0021] The mounting bracket is fixed to the intermediate partition plate inside the switch cabinet by bolts. Specifically, as follows: Figure 2 As shown, the mounting frame includes a transverse reinforcing liner 3 and two parallel steering baffle support plates 5 fixed to the reinforcing liner 3. The reinforcing liner 3 is an inverted U-shaped plate, with one end fixedly connected to the middle partition inside the switch cabinet by bolts. The two parallel steering baffle support plates 5 are fixed to the lower end face of the reinforcing liner 3 by bolts, thus forming a certain space between the two steering baffle support plates 5. The steering baffle 7 is located between the two steering baffle support plates 5. Bolts pass through the steering baffle 7 and the two steering baffle support plates 5 to achieve the hinge connection between the steering baffle 7 and the mounting frame. Furthermore, the bolts pass through the middle position of the steering baffle 7 in the vertical direction, causing the upper and lower ends of the steering baffle 7 to swing back and forth in opposite directions. The upper end of the steering baffle 7 passes through the reinforcing liner 3.

[0022] The steering baffle 7 is a vertically elongated bent plate structure, with its upper end tilted forward. The swing plane of the steering baffle 7 is perpendicular to the swing plane of the steering block 6.

[0023] It also includes a reset spring 8 connected to the steering baffle 7, one end of which is connected to the lower end of the steering baffle 7 and the other end is connected inside the switch cabinet.

[0024] When the trolley is shaken into the working position, the upper end of the steering baffle 7 is pushed to swing by the extension pressing plate 2, so that the lower end of the steering baffle 7 swings to the swing path of the steering block 6 when the switch is closed; after the trolley is shaken out of the working position, the steering baffle 7 is away from the swing path of the steering block 6 under the pulling force of the reset tension spring 8.

[0025] The present application has the following advantages when installed: (1) The extension pressing plate 2 is installed at the front of the trolley, so that the bottom of the extension pressing plate is flush with the chassis of the trolley.

[0026] (2) The rotating block 6 is installed on the grounding interlock large shaft 4, so that the side of the rotating block 6 close to the rotating baffle is perpendicular to the bottom surface of the switch cabinet.

[0027] (3) The installation hole and the long slot with a width of 10 mm are arranged on the middle partition plate, so that the protection level between the compartments meets IP2X.

[0028] (4) The reinforcing lining plate and the rotating baffle support plate are installed on the middle partition plate.

[0029] (5) The upper part of the rotating baffle penetrates into the middle partition plate, so as to realize the interlocking function with the trolley; the lower part is hinged on the rotating baffle support plate by using a shaft or a bolt; the gasket is installed between the rotating baffle and the rotating baffle support plate, and the lubricating grease is applied, so as to ensure the smoothness of the rotation; the rear reset tension spring is used to realize the connection.

[0030] The use method of the present application is as follows: when the trolley is in the test position, the steering baffle 7 is kept at the rear under the influence of the reset tension spring 8, and does not interfere with the steering block 6, so that the manual or electric switch can be normally used.

[0031] When the trolley is shaken into the working position, the chassis 1 of the trolley is shaken forward, the extension pressing plate 2 touches the upper end of the steering baffle 7, and the steering baffle 7 is squeezed by the extension pressing plate 2 and rotates along the shaft, so that the part of the steering baffle 7 above the middle partition plate is pressed below by the extension pressing plate 2 when the trolley reaches the test position, so that the steering baffle 7 blocks the steering block 6 on the grounding interlock large shaft 4; at this time, the grounding switch is operated to close, the motor drives the grounding interlock large shaft 4 and the steering block 6 to rotate, the steering block 6 is blocked by the steering baffle 7, so that the steering block 6 cannot act, reversely blocks the action of the grounding interlock large shaft 4, extends to the motor and the controller to be blocked, the controller alarms, and the motor is reset when blocked.

[0032] When the rotating operation grounding switch is operated, there is a part of the air gap, that is, the grounding interlock large shaft 4 rotates, but the grounding switch does not act, so the turning baffle 7 and the turning block 6 are reserved with a 5mm gap between them, which ensures that when the electric operation grounding switch is operated, the motor operation large shaft has a certain rotation margin, the motor acts first and then blocks, which effectively reduces the damage of the motor blocking. This scheme effectively avoids the situation that even if the electric operation grounding switch is operated, the grounding switch cannot be closed in the case of electrical interlock failure, which improves the reliability and safety of the switch cabinet.

[0033] During the process of the trolley from the working position to the test position, the turning baffle 7 is restored to the original position under the action of the reset tension spring 8. Thus, the electric grounding switch and the trolley working position are mechanically locked.

[0034] Of course, the above description is not limited to the above examples, and the technical features not described in the application can be realized by or using the prior art, which will not be described here; the above examples and drawings are only used to illustrate the technical solutions of the application and are not limited to the application. The preferred embodiments of the application are described in detail, and those skilled in the art should understand that the changes, modifications, additions or substitutions made by those skilled in the art within the essential scope of the application do not deviate from the purpose of the application, and should also belong to the protection scope of the claims of the application.

Claims

1. A mechanical lockout device for an electrically operated grounding switch and a handcart operating position, characterized by: The device comprises an extension pressing plate (2) fixed on a handcart chassis (1), a steering block (6) fixed on a grounding interlock axle (4), a mounting frame fixed in a switch cabinet, and a steering baffle (7) hinged on the mounting frame.

2. A mechanical lockout device for an electrically operated grounding switch and a handcart operating position according to claim 1, characterized in that: The extension pressing plate (2) is bolted on the front end of the handcart chassis (1).

3. A mechanical lockout device for an electrically operated grounding switch and a handcart operating position according to claim 1, characterized in that: The mounting frame comprises a transverse reinforcing lining (3) and two parallel steering baffle support plates (5) fixed on the reinforcing lining (3), and the steering baffle (7) is located between the two steering baffle support plates (5), and the steering baffle (7) is hinged on the mounting frame by bolts.

4. A mechanical lockout device for an electrically operated grounding switch and a handcart operating position according to claim 3, characterized in that: The upper end of the steering baffle (7) penetrates the reinforcing lining (3).

5. A mechanical lockout device for an electrically operated grounding switch and a handcart operating position according to claim 1, characterized in that: The upper and lower ends of the steering baffle (7) swing in opposite directions, the extension pressing plate (2) pushes the upper end of the steering baffle (7) to swing, and the lower end of the steering baffle (7) swings to the swing path of the steering block (6) when the switch is closed.

6. A mechanical lockout device for an electrically operated grounding switch and a handcart operating position according to claim 1, characterized in that: The upper end of the steering baffle (7) is inclined forward.

7. A mechanical lockout device for an electrically operated grounding switch and a handcart operating position according to claim 1, characterized in that: The swing plane of the steering baffle (7) is perpendicular to the swing plane of the steering block (6).

8. A mechanical lockout device for an electrically operated grounding switch and a handcart operating position according to claim 1, characterized in that: The mounting frame is bolted on the middle partition plate inside the switch cabinet.

9. A mechanical lockout device for an electrically operated grounding switch and a handcart operating position according to claim 1, characterized in that: One end of the reset tension spring (8) is connected to the lower end of the steering baffle (7), and the other end is connected inside the switch cabinet.

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