A two-stage interlocking device for an electric earthing switch and a circuit breaker

Abstract

The present invention discloses a two-stage interlocking device for an electric grounding switch and a circuit breaker, and belongs to the technical field of switch cabinets. It includes an operating hole baffle, which is arranged in a vertical limit slide groove inside the cabinet body, and a hollow operating window is arranged on the upper part of the operating hole baffle, and also includes an interlocking plate, a movable interlocking plate and a circuit breaker interlocking plate. The original manual operation interlocking structure is retained, and the downward limit of the toggle operation hole baffle can be released by toggling the circuit breaker interlocking plate, and the operating hole baffle is manually pressed down to expose the end of the grounding switch operating shaft from the operating window to achieve the closing and opening of the grounding switch; the electric operation mode relies on the electromagnet to energize to release the movable interlocking plate, release the downward limit of the toggle operation hole baffle, and unlock the rotation of the grounding switch operating shaft. The rotation of the operating shaft and the cam sheet will not be blocked by the horizontal slide surface of the operating hole baffle, so that the rotation of the operating shaft is unobstructed, thereby achieving the closing and opening of the grounding switch.

Description

Technical Field

[0001] The present invention relates to a two-stage interlocking device for an electric earthing switch and a circuit breaker, belonging to the technical field of switch cabinets. Background Art

[0002] The earthing switch is used to release the static charge of the electrical equipment under maintenance and is an important mechanical earthing device to ensure the personal safety of maintenance personnel. In case of abnormal conditions such as short circuits, it can withstand the current for a certain period of time, but under normal operating conditions, it does not pass the load current. In general use, the earthing switch is part of the disconnecting switch, and the two are often combined into one device. At present, there are two operation modes for closing and opening the earthing switch: (1) the traditional manual operation mode; (2) the electric operation mode.

[0003] In the traditional manual operation mode, the operating shaft is connected to the switch main shaft of the earthing switch by a gear. By manually putting the operating handle of the earthing switch on the end of the operating shaft and rotating the operating shaft, the switch main shaft is driven to realize the closing and opening of the earthing switch.

[0004] In the electric operation mode, the motor directly drives the rotation of the switch main shaft to realize the closing and opening of the earthing switch.

[0005] Both of the above two operation modes require an interlocking device. Only when the rear door of the switch cabinet is closed can the earthing switch be opened; only after the earthing switch is closed can the rear door of the switch cabinet be opened. In addition, during manual operation, the circuit breaker interlocking plate can also be linked with the earthing switch. Only when the circuit breaker interlocking plate is unlocked can the earthing switch be closed to ensure the safety of the operator and the equipment. The setting of the interlocking device can prevent the operator from entering the live compartment by mistake and ensure the safety of the equipment and personnel.

[0006] At present, the conventional interlocking mechanism without electric operation is already very perfect. However, with the development of the automation of switchgear, the electric operation mode has been more and more widely applied, and more and more earthing switches have electric functions. At this time, the conventional interlocking mechanism can no longer meet the requirements. In order to enable the electric earthing switch to be operated manually and electrically, a two-stage interlocking device for an electric earthing switch and a circuit breaker is designed. The two-stage interlocking device adds the interlocking that meets the electric operation requirements on the basis of meeting the interlocking requirements of manual operation. Summary of the Invention

[0007] The technical problem to be solved by the present invention is: to provide a two-stage interlocking device for an electric earthing switch and a circuit breaker, which solves the problem that the current earthing switch interlocking device cannot be compatible with both electric operation and manual operation modes.

[0008] The technical problem to be solved by the present invention is achieved by the following technical solutions:

[0009] Preferred solution 1: A two-stage interlocking device for an electric earthing switch and a circuit breaker, comprising an operating hole baffle plate, which is arranged in a vertical limiting chute inside the cabinet body. The upper end of the operating hole baffle plate is connected to the upper cabinet body through a tension spring. An operating window with a hollowed-out part is arranged on the upper part of the operating hole baffle plate. When the operating hole baffle plate is at the uppermost position of the vertical limiting chute, the lower part of the operating hole baffle plate blocks the earthing switch operating shaft inside. A horizontal sliding plate surface is arranged on the inner side of the operating hole baffle plate, and a cam piece pressing on the horizontal sliding plate surface is arranged on the earthing switch operating shaft. It also includes an interlocking plate, a movable interlocking plate and a circuit breaker interlocking plate;

[0010] The interlocking plate is fixed at the bottom of the operating hole baffle plate. A horizontal baffle is arranged on the upper part of the interlocking plate, and a vertical chute is arranged on the lower part. An electromagnet with a suction rod that extends in the power-off state is fixed on one side of the vertical chute;

[0011] The movable interlocking plate is restricted to slide up and down in the vertical chute. A guiding shaft passing through the horizontal baffle is fixed at the top of the movable interlocking plate. A locking nut for restricting the downward movement of the movable interlocking plate is fixed at the top end of the guiding shaft. A compression spring is sleeved on the guiding shaft between the horizontal baffle and the movable interlocking plate. A positioning hole is arranged on one side of the movable interlocking plate. When the compression spring is in the maximum extended state, the suction rod of the electromagnet just inserts into the positioning hole;

[0012] The circuit breaker interlocking plate is arranged in a horizontal limiting chute on the inner side of the cabinet body below the movable interlocking plate. A horizontal chute hole is arranged on the outer side wall of the horizontal limiting chute. A handle passing through the horizontal chute hole is arranged on the outer side of the circuit breaker interlocking plate. When the circuit breaker interlocking plate extends out of the horizontal limiting chute, it blocks the lower end of the movable interlocking plate. When the circuit breaker interlocking plate completely retracts into the horizontal limiting chute, the lower end of the movable interlocking plate is unrestricted.

[0013] On the basis of the original manual earthing switch structure, a two-stage interlocking device is designed. The two-stage interlocking device means that the first stage composed of the operating hole baffle plate and the interlocking plate, and the movable interlocking plate connected below the interlocking plate through a compression spring and a guiding shaft is the second stage.

[0014] Manual operation mode:

[0015] When starting the manual operation mode, the electromagnet is not powered on, and the suction rod of the electromagnet extends and inserts into the positioning hole of the movable interlocking plate. The operating hole baffle plate, the interlocking plate and the movable interlocking plate move integrally. Manually move the handle and the circuit breaker interlocking plate to retract into the horizontal limiting chute, so that the lower end of the movable interlocking plate is unrestricted, and the operating hole baffle plate can move downwards. The cam piece on the operating shaft is not blocked by the horizontal sliding plate surface, completing the unlocking of the operating shaft. Then manually overcome the tension of the tension spring to pull down the operating hole baffle plate, expose the end of the earthing switch operating shaft from the operating window, put the earthing switch operating handle on the end of the operating shaft, and the earthing switch operating handle drives the operating shaft, thereby driving the switch main shaft to realize the closing and opening of the earthing switch.

[0016] Electric operation mode:

[0017] When the electric operation mode is started, the electromagnet is energized, the electromagnet's suction rod is disengaged from the positioning hole, and the operating hole baffle and interlocking plate can move relative to the movable interlocking plate. The circuit breaker interlocking plate is in an extended state, blocking the lower end of the movable interlocking plate, limiting the movement of the movable interlocking plate. The motor drives the switch main shaft of the grounding switch to rotate, and the switch main shaft drives the operating shaft to rotate through the gear. The cam piece on the operating shaft presses down the horizontal sliding plate surface on the inner side of the operating hole baffle, and the operating hole baffle and interlocking plate overcome the elastic force of the compression spring and move downward relative to the movable interlocking plate, unlocking the operating shaft of the grounding switch, so that the operating shaft can rotate without hindrance, thereby realizing the closing and opening of the grounding switch.

[0018] Preferred solution two, the movable interlocking plate is provided with a vertical long waist hole, and a rivet screw that slides in cooperation with the long waist hole is fixed on the vertical slide groove.

[0019] The movable interlocking plate is installed movably through the long waist hole, which can move within the limited range of the long waist hole and has stable and reliable operation.

[0020] Preferred solution three, the operating hole baffle is provided with a vertical slide, a slidably matched limit block is provided in the vertical slide, and the limit block is fixed to the vertical limit slide groove by screws and nuts.

[0021] In addition to being set in the vertical limit slide groove inside the cabinet, the operation hole baffle also cooperates with the limit block through the vertical slide, making the up and down sliding smoother and more stable.

[0022] Preferred solution four, a hole plate extending outward is provided at the bottom edge of the operation window of the operation hole baffle.

[0023] The operation hole baffle can be moved downward by manually pressing down the orifice plate to expose the operation window.

[0024] The beneficial effects of the present invention are:

[0025] (1) The original manual operation interlocking structure is retained. By toggling the circuit breaker interlocking plate, the downward limit of the toggle operation hole baffle can be released, and the operation hole baffle can be manually pressed down to expose the end of the grounding switch operating shaft from the operation window. The grounding switch operating handle is sleeved on the end of the operating shaft, and the operating shaft is rotated to drive the switch main shaft to realize the closing and opening of the grounding switch;

[0026] (2) The electric operation mode relies on the energization of the electromagnet to release the movable interlock plate. Even if the circuit breaker interlock plate is not manually toggled, when the movable interlock plate is blocked, the operating hole baffle can move downward against the elastic force of the compression spring, unlocking the rotation of the earthing switch operating shaft through the electromagnet. The rotation of the operating shaft and the cam plate will not be blocked by the horizontal sliding plate surface of the operating hole baffle. The rotation of the cam plate will press down the horizontal sliding plate, enabling the operating shaft to rotate without obstruction, thereby achieving the closing and opening of the earthing switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic structural diagram of the present invention;

[0028] Figure 2 is a top view structural diagram of the operating hole baffle and the vertical limit chute;

[0029] Figure 3 is a schematic structural diagram of the present invention applied to a switchgear cabinet;

[0030] Figure 4 is a schematic structural diagram of the electromagnet locking the movable interlock plate;

[0031] Figure 5 is a schematic structural diagram of the horizontal sliding plate surface of the earthing switch operating shaft being pressed down by the cam plate;

[0032] Figure 6 is a schematic structural diagram after the electromagnet unlocks the movable interlock plate.

[0033] In the figure: 1. Operating hole baffle; 101. Operating window; 102. Horizontal sliding plate surface; 103. Vertical slideway; 104. Limit block; 105. Hole plate; 2. Vertical limit chute; 3. Tension spring; 301. Connecting seat; 4. Cabinet body; 5. Operating shaft; 501. Cam plate; 6. Interlock plate; 601. Horizontal baffle; 602. Vertical chute; 603. Electromagnet; 604. Suction rod; 605. Rivet screw; 7. Movable interlock plate; 701. Guide shaft; 702. Locking nut; 703. Compression spring; 704. Positioning hole; 705. Long waist hole; 8. Circuit breaker interlock plate; 801. Horizontal limit chute; 802. Horizontal chute hole; 803. Handle; 9. Earthing switch; 901. Switch main shaft. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] In order to facilitate the understanding of the technical means, creative features, achieved purposes and effects of the present invention, the present invention will be further described below in conjunction with specific embodiments.

[0035] Embodiment 1

[0036] As Figure 1 , Figure 2 , Figure 5As shown in the figure, the two-stage interlocking device includes an operation hole baffle 1. The operation hole baffle 1 is arranged in the vertical limit chute 2 inside the cabinet body 4. The upper end of the operation hole baffle 1 is connected to the upper cabinet body 4 through a tension spring 3. The upper end of the tension spring 3 is connected to the inside of the cabinet body 4 through a connecting seat 301. An operation window 101 with a hollowed-out structure is arranged on the upper part of the operation hole baffle 1. When the operation hole baffle 1 is located at the uppermost part of the vertical limit chute 2, the lower part of the operation hole baffle 1 covers the operating shaft 5 of the earthing switch 9 inside. A horizontal sliding surface 102 is arranged on the inner side of the operation hole baffle 1, and a cam piece 501 pressing on the horizontal sliding surface 102 is arranged on the operating shaft 5 of the earthing switch 9.

[0037] As Figure 3 shown, in the traditional manual operation mode, the operating shaft 5 is connected to the switch main shaft 901 of the earthing switch 9 through a gear. By manually putting an earthing switch operating handle on the end of the operating shaft 5 and rotating the operating shaft 5, the switch main shaft 901 is driven to realize the closing and opening of the earthing switch 9. When the electric operation mode is adopted, a gear can be arranged on the switch main shaft 901, and the gear and the switch main shaft 901 are driven to rotate by a motor, so as to realize the electric closing and opening operations of the earthing switch.

[0038] In addition to the above structure, this solution also includes an interlocking plate 6, a movable interlocking plate 7 and a circuit breaker interlocking plate 8;

[0039] The interlocking plate 6 is fixed at the bottom of the operation hole baffle 1. A horizontal baffle 601 is arranged on the upper part of the interlocking plate 6, and a vertical chute 602 is arranged on the lower part. An electromagnet 603 whose suction rod 604 extends in the power-off state is fixed on one side of the vertical chute 602. The electromagnet 603 is a commercially available product, mainly composed of a suction rod 604 adsorbed by an electromagnetic coil and a return spring that pushes the suction rod 604 out and extends in the power-off situation;

[0040] The movable interlocking plate 7 is restricted to slide up and down in the vertical chute 602. A guide shaft 701 passing through the horizontal baffle 601 is fixed at the top of the movable interlocking plate 7. A locking nut 702 for restricting the downward movement of the movable interlocking plate 7 is fixed at the top end of the guide shaft 701. A compression spring 703 is sleeved on the guide shaft 701 between the horizontal baffle 601 and the movable interlocking plate 7. A positioning hole 704 is arranged on one side of the movable interlocking plate 7. When the compression spring 703 is in the maximum elongation state, the suction rod 604 of the electromagnet 603 just inserts into the positioning hole 704;

[0041] The circuit breaker interlocking plate 8 is arranged in a horizontal limiting slide groove 801 located on the inner side of the cabinet 4 below the movable interlocking plate 7. A horizontal slide groove hole 802 is arranged on the outer side wall of the horizontal limiting slide groove 801. A handle 803 passing through the horizontal slide groove hole 802 is arranged on the outer side of the circuit breaker interlocking plate 8. When the circuit breaker interlocking plate 8 extends out from the horizontal limiting slide groove 801, it is blocked at the lower end of the movable interlocking plate 7. When the circuit breaker interlocking plate 8 is fully retracted into the horizontal limiting slide groove 801, the lower end of the movable interlocking plate 7 is unrestricted.

[0042] Based on the structure of the original manual earthing switch 9, a two-stage interlocking device is designed. The two-stage interlocking device refers to: the first stage is composed of the operating hole baffle 1 and the interlocking plate 6, and the movable interlocking plate 7 connected to the lower part of the interlocking plate 6 by the compression spring 703 and the guide shaft 701 is the second stage.

[0043] Manual operation mode:

[0044] like Figure 1 As shown, when the manual operation mode is started, the electromagnet 603 is not energized, the suction rod 604 of the electromagnet 603 is extended and inserted into the positioning hole 704 of the movable interlocking plate 7, and the operating hole baffle 1, the interlocking plate 6, and the movable interlocking plate 7 move in an integrated manner. The handle 803 and the circuit breaker interlocking plate 8 are manually moved and retracted into the horizontal limit slide groove 801, so that the lower end of the movable interlocking plate 7 is unrestricted, the operating hole baffle 1 can move downward, and the cam piece 501 on the operating shaft 5 is not blocked by the horizontal slide surface 102, and the operating shaft 5 is unlocked. Then, the operating hole baffle 1 is manually pulled down by overcoming the tension of the tension spring 3, and the end of the operating shaft 5 of the grounding switch 9 is exposed from the operating window 101. The operating handle of the grounding switch 9 is used to cover the end of the operating shaft 5. The operating handle of the grounding switch 9 drives the operating shaft 5, thereby driving the switch main shaft 901 to achieve the closing and opening of the grounding switch 9.

[0045] The original manual operation interlocking structure is retained, and the downward restriction of the toggle operation hole baffle 1 can be released by toggling the circuit breaker interlocking plate 8, and the operation hole baffle 1 can be manually pressed down to expose the end of the operating shaft 5 of the grounding switch 9 from the operation window 101. The grounding switch 9 operating handle is used to be sleeved on the end of the operating shaft 5, and the operating shaft 5 is rotated to drive the switch main shaft 901 to realize the closing and opening of the grounding switch 9.

[0046] Electric operation mode:

[0047] like Figure 1 , Figures 4 - 6As shown, when the electric operation mode is started, the electromagnet 603 is energized, the suction rod 604 of the electromagnet 603 is disengaged from the positioning hole 704, and the operating hole baffle 1 and the interlocking plate 6 can move relative to the movable interlocking plate 7. The circuit breaker interlocking plate 8 is in an extended state, blocking the lower end of the movable interlocking plate 7, limiting the movement of the movable interlocking plate 7. The motor drives the switch main shaft 901 of the grounding switch 9 to rotate, and the switch main shaft 901 drives the operating shaft 5 to rotate through the gear. The cam piece 501 on the operating shaft 5 presses down the horizontal slide surface 102 on the inner side of the operating hole baffle 1, and the operating hole baffle 1 and the interlocking plate 6 overcome the elastic force of the compression spring 703 and move downward relative to the movable interlocking plate 7, unlocking the operating shaft 5 of the grounding switch 9, so that the operating shaft 5 can rotate without hindrance, thereby realizing the closing and opening of the grounding switch 9.

[0048] The electric operation mode relies on the electromagnet 603 to energize and release the movable interlock plate 7. Even if the circuit breaker interlock plate 8 is not manually turned, the movable interlock plate 7 is blocked, and the operating hole baffle 1 can overcome the elastic force of the compression spring 703 and move downward, unlocking the rotation of the operating shaft 5 of the grounding switch 9 through the electromagnet 603. The rotation of the operating shaft 5 and the cam piece 501 will not be blocked by the horizontal slide surface 102 of the operating hole baffle 1. The rotation of the cam piece 501 will press down the horizontal slide, so that the rotation of the operating shaft 5 is unobstructed, thereby realizing the closing and opening of the grounding switch 9.

[0049] Original electric operation mode (without electromagnet 603 and movable interlocking plate 7):

[0050] When the electric operation mode is started, the operator still needs to manually turn the circuit breaker interlocking plate 8 so that the lower end of the operating hole baffle 1 is not restricted, so that the operating hole baffle 1 cannot move downward, and the cam piece 501 is restricted from rotating by the horizontal slide surface 102, so that the operating shaft 5 cannot rotate, so that the switch main shaft 901 and the motor connected to the operating shaft 5 through the gear are locked. However, this solution does not require manual release of the circuit breaker interlocking plate 8, and the electromagnet 603 can be used to unlock the connection between the operating hole baffle 1 and the interlocking plate 6 in the first section and the movable interlocking plate 7 in the second section, so that the first section can move downward relative to the second section, so as to achieve the purpose of both manual operation and full automatic operation of the grounding switch 9.

[0051] Example 2

[0052] like Figure 4 As shown, other structures are the same as those in Example 1, a vertical long waist hole 705 is provided on the movable interlocking plate 7, and a rivet screw 605 that slides with the long waist hole 705 is fixed on the vertical slide groove 602. The specific fixing method is to set a thread on the end of the rivet screw 605, and screw a nut into the rivet screw 605, and there is a gap between the rivet screw 605 and the movable interlocking plate 7, so that the movable interlocking plate 7 can slide up and down freely.

[0053] The long waist hole 705 is adopted to movably install the movable interlock plate 7, which can move within the limit range of the long waist hole 705, and the operation is stable and reliable.

[0054] Embodiment 3

[0055] As Figure 1 、 Figure 2 As shown, the other structures are the same as those in Embodiment 2. The operation hole baffle 1 is provided with a vertical slideway 103, and a limiting block 104 in sliding fit is arranged in the vertical slideway 103. The limiting block 104 is fixed to the vertical limiting chute 2 by screws and nuts.

[0056] In addition to being arranged in the vertical limiting chute 2 inside the cabinet body 4, the operation hole baffle 1 is also matched with the limiting block 104 through the vertical slideway 103, and the up and down sliding is smoother and more stable.

[0057] Embodiment 4

[0058] As Figure 1 、 Figure 2 As shown, the other structures are the same as those in Embodiment 1. The bottom edge of the operation window 101 of the operation hole baffle 1 is provided with a hole plate 105 extending outwards.

[0059] The operation hole baffle 1 can be moved down by manually pressing down the hole plate 105 by hand so as to expose the operation window 101.

[0060] In addition, the hole plate 105 can also be used in cooperation with another hole plate 105 (not shown in the figure) fixed at the corresponding position above the back of the cabinet body 4, and the two hole plates 105 are locked by a lock to prevent unauthorized personnel from misoperating.

[0061] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. A two-stage interlocking device for an electric earthing switch and a circuit breaker, comprising an operating hole baffle plate which is arranged in a vertical limiting chute inside the cabinet body. The upper end of the operating hole baffle plate is connected to the upper cabinet body through a tension spring. An operating window with a hollowed-out part is arranged at the upper part of the operating hole baffle plate. When the operating hole baffle plate is at the uppermost position of the vertical limiting chute, the lower part of the operating hole baffle plate shields the earthing switch operating shaft inside. A horizontal sliding plate surface is arranged on the inner side of the operating hole baffle plate, and a cam piece pressing on the horizontal sliding plate surface is arranged on the earthing switch operating shaft. It is characterized in that It further includes an interlocking plate, a movable interlocking plate and a circuit breaker interlocking plate; The interlocking plate is fixed at the bottom of the operation hole baffle. A horizontal baffle is arranged on the upper part of the interlocking plate, and a vertical chute is arranged on the lower part. An electromagnet with a suction rod that extends in the power-off state is fixed on one side of the vertical chute; The movable interlocking plate is restricted to slide up and down in the vertical chute. A guide shaft passing through the horizontal baffle is fixed at the top of the movable interlocking plate. A locking nut for restricting the downward movement of the movable interlocking plate is fixed at the top end of the guide shaft. A compression spring is sleeved on the guide shaft between the horizontal baffle and the movable interlocking plate. A positioning hole is arranged on one side of the movable interlocking plate. When the compression spring is in the maximum elongation state, the suction rod of the electromagnet just inserts into the positioning hole; The circuit breaker interlocking plate is arranged in a horizontal limit chute on the inner side of the cabinet below the movable interlocking plate. A horizontal chute hole is arranged on the outer side wall of the horizontal limit chute. A handle passing through the horizontal chute hole is arranged on the outer side of the circuit breaker interlocking plate. When the circuit breaker interlocking plate extends out of the horizontal limit chute, it blocks the lower end of the movable interlocking plate. When the circuit breaker interlocking plate completely retracts into the horizontal limit chute, the lower end of the movable interlocking plate is unrestricted.

2. The two-stage interlocking device for an electric earthing switch and a circuit breaker according to claim 1, wherein, A vertical oblong hole is arranged on the movable interlocking plate, and a rivet screw that cooperates with the oblong hole to slide is fixed on the vertical chute.

3. The two-stage interlocking device for an electric earthing switch and a circuit breaker according to claim 1 or 2, characterized in that, The operation hole baffle is provided with a vertical slideway, and a limit block that slides in cooperation is arranged in the vertical slideway. The limit block is fixed to the vertical limit chute through screws and nuts.

4. The two-stage interlocking device for an electric earthing switch and a circuit breaker according to claim 1, wherein, The bottom edge of the operation window of the operation hole baffle is provided with a hole plate that extends outwards.

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