Mechanical interlocking plug-in box

Abstract

The application discloses a mechanical interlocking plug-in box, which comprises a box body, a box cover, and a first chamber and a second chamber formed by an end sealing plate in the box body; a lock foot mechanism is arranged in the first chamber, and a circuit breaker is arranged in the second chamber; a vertical sliding groove is formed on the surface of a guide movable plate of the lock foot mechanism; a limiting rod is horizontally arranged in the first chamber and is in limiting cooperation with the vertical sliding groove, and one end of the limiting rod extends into the second chamber along the axial direction of the rod to interlock the guide movable plate; a linkage operating mechanism is connected between the limiting rod and the circuit breaker, and is used for driving the limiting rod to cancel the limiting of the guide movable plate and synchronously controlling the circuit breaker to make a breaking action; and an opening and closing mechanism is connected between the linkage operating mechanism and the circuit breaker, and is used for interlocking the breaking state of the circuit breaker and hindering the circuit breaker to make a closing action. The application realizes the interlocking between the lock foot of the plug-in box and the opening and closing mechanism of the plug-in box, and improves the safety protection level.

Description

A mechanical interlocking plug box Technical Field

[0001] This invention relates to the field of power technology, and more specifically to a mechanically interlocked plug-in box. Background Technology

[0002] Most existing circuit breaker (including miniature circuit breakers) manual operating mechanisms on the market are based on rotary handles, controlling the opening and closing of the box door (cover) via a linkage. These mechanisms are widely used in switchgear, busbar duct plug-in boxes (or tap changers), and other switchgear, representing a common operating structure for mechanically interlocked plug-in boxes. However, there is no dedicated operating mechanism available for individual products, such as busbar duct plug-in boxes.

[0003] Our company has applied for a utility model patent for a mechanical interlocking plug-in box circuit breaker operating mechanism based on the existing rotary handle mechanism of miniature circuit breakers - application number: 2020213077695. This mechanism converts the rotary handle of the miniature circuit breaker itself into a linear motion mechanism for opening and closing. A single mechanism can independently realize the opening and closing of a single-pole miniature circuit breaker. However, it only realizes the opening and closing of a single-pole switch of the miniature circuit breaker and does not realize interlocking. In 2020, we applied for an invention patent for a mechanical interlocking plug-in box with a linkage locking function, application number: 202011240482X. Although this patent realizes the basic interlocking protection function, it lacks the emergency unlocking function.

[0004] In view of this, it is necessary to improve the interlocking structure in the existing technology to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to disclose a mechanically interlocked plug-in box to solve the problems of existing plug-in boxes lacking interlocking protection capabilities, emergency unlocking functions, and safety protection. This invention can perform bidirectional synchronous control of the plug-in box by rotating the handle, and perform safety interlocking on the plug-in box locking feet and the opening and closing mechanism, thereby reducing operational risks.

[0006] To achieve the above objectives, the present invention provides a mechanical interlocking plug-in box, including a box body and a box body cover. The interior of the box body is divided into a first chamber and a second chamber by an end sealing plate. A locking foot mechanism is arranged in the first chamber, and a circuit breaker is arranged in the second chamber.

[0007] The guide plate of the locking mechanism has a vertical groove on its surface;

[0008] It also includes: a limiting rod, which is horizontally arranged in the first chamber and forms a limiting fit with the vertical slide groove, and one end extends along the axial direction of the rod into the second chamber for interlocking the guide movable plate;

[0009] A linkage operating mechanism is connected between the limit rod and the circuit breaker, used to drive the limit rod to remove its limit on the guide movable plate and simultaneously control the circuit breaker to perform a tripping action;

[0010] The opening and closing mechanism is connected between the linkage operation mechanism and the circuit breaker, and is used to interlock the opening state of the circuit breaker and prevent the circuit breaker from closing.

[0011] The linkage operation mechanism includes:

[0012] A cam, arranged in the second chamber, has its rotation center connected to a rotating handle on the top of the housing via a vertical rotating shaft, and is used to make the limiting rod slide along the axial direction of the rod under the drive of the rotating handle;

[0013] A rack and pinion reversing assembly is arranged between the vertical rotating shaft and the circuit breaker to convert the rotation of the vertical rotating shaft into a horizontal sliding motion that drives the circuit breaker's opening and closing levers to perform an opening action.

[0014] The opening and closing mechanism includes:

[0015] The drive plate is arranged parallel to the rack of the gear and rack reversing assembly and is connected to the rack via a connector;

[0016] A transverse lever is arranged on the track axis of the circuit breaker opening and closing lever and connected to the drive plate. Under the drive of the drive plate, the circuit breaker opening and closing lever is pushed to the opening end or restricted to the opening end.

[0017] As a further improvement of the present invention, the connecting member is a drive coupling plate, which is connected between the drive plate and the rack;

[0018] The drive coupling plate is fixedly connected to the drive plate. The drive coupling plate is rotatably connected to the housing at one end away from the drive plate by a detachable screw. A slider is rotatably connected to the drive coupling plate. A first sliding groove that cooperates with the slider is opened on the rack. Under the horizontal sliding drive of the rack, the drive coupling plate rotates and swings around the detachable screw as the rotation center, and drives the drive plate to slide towards the opening end. The slider slides along the opening direction of the first sliding groove.

[0019] As a further improvement of the present invention, a limiting hole is provided at the bottom end of the vertical slide groove, and a limiting block is provided on the limiting rod to cooperate with the limiting hole.

[0020] As a further improvement of the present invention, a return spring is provided at the end of the limiting rod away from the cam. During the rotation and reset process of the cam, the return spring is used to restore the locking of the limiting rod to the guide plate.

[0021] As a further improvement of the present invention, the outer edge of the cam is provided with a track groove, and the end of the limiting rod near the cam is provided with a protrusion that cooperates with the track groove, so that the limiting rod and the cam always remain in a movable connection.

[0022] As a further improvement of the present invention, the rotating handle is provided with a locking mechanism for fixing the rotation position of the rotating handle.

[0023] As a further improvement of the present invention, the gear and rack reversing assembly includes:

[0024] The gear is fixed on the vertical rotating shaft and rotates about the rotation center of the vertical rotating shaft;

[0025] The rack is plate-shaped and arranged parallel to the track shaft. It has a toothed groove on the side near the gear that meshes with the gear. Multiple horizontal grooves are provided on the rack along the sliding direction of the rack.

[0026] The guide post is vertically fixed on the structural base of the housing, and its top passes through the horizontal slide groove to limit the horizontal sliding of the rack.

[0027] As a further improvement of the present invention, the opening and closing mechanism further includes a guide rod, which is arranged parallel to the track axis and slides in cooperation with the drive plate to provide guidance for the movement of the drive plate.

[0028] Compared with the prior art, the beneficial effects of the present invention are:

[0029] (1) A mechanically interlocked plug-in box interlocks the circuit breaker's opening and closing operations with the plug-in box and busbar duct's locking operations. By controlling the rotation of the handle on the top of the box, the variable radius structure of the cam drives the limit rod to move, thereby releasing the limit engagement between the limit rod and the vertical slide groove, unlocking the vertical movable plate. The vertical movable plate is controlled to move by the pull plate set on the side of the box, opening the locking foot and allowing the plug-in box to detach from the busbar duct. At the same time, the rotation of the vertical shaft is converted into horizontal sliding by the gear and rack reversing assembly, so as to drive the opening and closing mechanism to push the circuit breaker's opening and closing lever to the opening end or restrict it to the opening end. On the one hand, it can avoid the circuit breaker being in the closed state when the locking foot is open, thus avoiding the risk of electric shock. On the other hand, it can avoid the risk of accidental closing of the circuit breaker during maintenance due to operator error. This invention can perform bidirectional synchronous control of the plug-in box by rotating the handle, and perform safety interlocking on the plug-in box locking foot and the opening and closing mechanism, reducing operational risks and improving the safety protection level.

[0030] (2) Drive plate, which is connected to the rack and drive plate, has an emergency unlocking function. In the event of a circuit breaker burnout, the drive plate and rack are changed from sliding fit to rotational fit by removing the detachable screws. The rack slide is released from the jammed state, thereby unlocking the guide movable part by rotating the handle to drive the limit rod. The locking foot can move, allowing the plug box to detach from the busbar. Attached Figure Description

[0031] Figure 1 is a top view of a mechanical interlocking plug-in box according to the present invention, with the box cover plate omitted;

[0032] Figure 2 is a schematic diagram of the locking foot mechanism in a mechanical interlocking plug box according to the present invention. The end sealing plate is also disclosed in the figure.

[0033] Figure 3 is a cross-sectional view of Figure 2;

[0034] Figure 4 is a schematic diagram of the guide plate in Figure 2;

[0035] Figure 5 is a schematic diagram of the cooperation between the linkage operation mechanism and the drive plate in Embodiment 2 of the present invention. The figure also shows the structural base at the bottom of the box.

[0036] Figure 6 is a schematic diagram of the installation and engagement of the cam, vertical shaft, and gear in a mechanical interlocking plug-in box according to the present invention;

[0037] Figure 7 is a schematic diagram of the opening and closing mechanism of a mechanical interlocking plug-in box circuit breaker according to the present invention;

[0038] Figure 8 is a schematic diagram of the positional relationship between the opening and closing mechanism and the opening and closing lever in the circuit breaker in a mechanical interlocking plug box of the present invention, and the horizontal lever is located at the closing end in the figure;

[0039] Figure 9 is a side view of a mechanical interlocking plug box according to the present invention, which shows the pull plate and the plug.

[0040] Figure 10 is a schematic diagram of the cover plate of a mechanical interlocking plug-in box according to the present invention, showing the rotating handle.

[0041] In the diagram: 10. End sealing plate; 11. Locking foot mechanism; 12. Circuit breaker; 14. Rotating handle; 15. Opening and closing control handle; 100. Housing; 101. First chamber; 102. Second chamber; 111. Guide plate; 112. Locking foot; 113. Pull plate; 121. Opening and closing lever; 122. Track shaft; 130. Structural base; 131. Limiting rod; 132. Linkage operation mechanism; 133. Connecting piece; 134. Opening and closing mechanism Gate mechanism; 135, guide post; 131a, limit block; 134a, drive plate; 134b, transverse lever; 134c, guide rod; 1110, vertical slide groove; 1110', limit hole; 1310, return spring; 1320, vertical rotating shaft; 1321, cam; 1322, gear; 1323, rack; 1323a, horizontal slide groove; 1331, detachable screw; 1332, slider; 1323', first slide groove. Detailed Implementation

[0042] The present invention will now be described in detail with reference to the embodiments shown in the accompanying drawings. However, it should be noted that these embodiments are not intended to limit the present invention. Equivalent changes or substitutions in function, method, or structure made by those skilled in the art based on these embodiments are all within the scope of protection of the present invention.

[0043] Please refer to Figures 1 to 10 for a specific embodiment of the mechanical interlocking plug-in box of the present invention.

[0044] Example 1:

[0045] In this embodiment, a mechanical interlocking plug-in box includes a box body 100 and a box body 100 cover plate. The interior of the box body 100 is divided into a first chamber 101 and a second chamber 102 by an end sealing plate 10. A locking foot 112 mechanism 11 is arranged in the first chamber 101, and a circuit breaker 12 is arranged in the second chamber 102. A vertical sliding groove 1110 is opened on the surface of the guide movable plate 111 of the locking foot 112 mechanism 11. The box also includes a limiting rod 131, which is horizontally arranged in the first chamber 101 and forms a limiting fit with the vertical sliding groove 1110. One end of the rod extends axially into the second chamber 102 for interlocking the guide movable plate 111. Specifically, a limiting hole 1110' is opened at the bottom end of the vertical sliding groove 1110, and a limiting block 131a that cooperates with the limiting hole 1110' is provided on the limiting rod 131. A return spring 1310 is provided at the end of the limit rod 131 away from the cam 1321. During the rotation and reset of the cam 1321, the return spring 1310 is used to restore the lock of the limit rod 131 on the guide movable plate 111. As shown in Figure 2-4, by controlling the rotation handle 14 on the top of the control box 100 to rotate, the variable radius structure of the cam 1321 drives the limit rod 131 to move, so that the limiting engagement between the limit rod 131 and the vertical slide 1110 is released, the vertical movable plate is unlocked, and the vertical movable plate is controlled to move by the pull plate 113 provided on the side of the control box 100, opening the locking foot 112, so that the plug box is detached from the busbar trunking; when the circuit breaker 12 is in the normal closed state, the limit rod 131 locks the vertical movable plate, and the operator cannot open the locking foot 112 by manually pulling the pull plate 113, thus protecting the plug box and preventing the plug box from detaching from the plug box and causing the risk of accidental electric shock.

[0046] Specifically, as shown in Figure 5, the linkage operation mechanism 132 is connected between the limit rod 131 and the circuit breaker 12. It is used to drive the limit rod 131 to release its limit on the guide movable plate 111 and simultaneously control the circuit breaker 12 to perform a tripping action. The linkage operation mechanism 132 includes: a cam 1321, which is arranged in the second chamber 102. Its rotation center is connected to the rotating handle 14 on the top of the housing 100 through the vertical rotating shaft 1320. It is used to make the limit rod 131 slide along the axial direction of the rod under the drive of the rotating handle 14; a gear 1322 and a rack 1323 reversing assembly, which are arranged between the vertical rotating shaft 1320 and the circuit breaker 12. It is used to convert the rotation of the vertical rotating shaft 1320 into horizontal sliding that drives the circuit breaker 12's tripping block 121 to perform a tripping action.

[0047] Specifically, as shown in Figures 7-8, the opening and closing mechanism 134 is connected between the linkage operation mechanism 132 and the circuit breaker 12, and is used to interlock the open state of the circuit breaker 12 to prevent the circuit breaker 12 from performing a closing action. The opening and closing mechanism 134 includes: a drive plate 134a, which is arranged parallel to the rack 1323 of the gear 1322 rack 1323 reversing assembly, and is connected to the rack 1323 through a connector 133. The connector 133 is a connecting rod or a connecting plate, which is used to fix the rack 1323 and the drive plate 134a, and plays a transmission role; a transverse lever 134b, which is arranged on the track shaft 122 of the opening and closing lever 121 and is connected to the drive plate 134a. Under the drive of the drive plate 134a, the opening and closing lever 121 of the circuit breaker 12 is pushed to the open end or restricted to the open end. The opening and closing control handle 15 is a drive unit for directly controlling the opening and closing lever 121 from outside the housing 100.

[0048] Specifically, the gear 1322 and rack 1323 reversing assembly includes: a gear 1322, fixed on a vertical rotating shaft 1320, rotating about the rotation center of the vertical rotating shaft 1320; a rack 1323, plate-shaped, arranged parallel to the track shaft 122, with a toothed groove on the side near the gear 1322 that meshes with the gear 1322; and multiple horizontal grooves 1323a along the sliding direction of the rack 1323; and a guide post 135, vertically fixed on the structural base 130 of the housing 100, with its top passing through the horizontal grooves 1323a, providing a limiting fit for the horizontal sliding of the rack 1323. The opening and closing mechanism 134 also includes a guide rod 134c, arranged parallel to the track shaft 122, and slidingly engaged with the drive plate 134a, providing guidance for the movement of the drive plate 134a.

[0049] The rotation of the vertical shaft 1320 is converted into horizontal sliding by the gear 1322 and rack 1323 reversing assembly, so as to drive the circuit breaker 12 opening and closing mechanism 134 to push the circuit breaker 12 opening and closing block 121 to the opening end or restrict it to the opening end. On the one hand, it can avoid the circuit breaker 12 being in the closed state when the locking foot 112 is in the open state, thus avoiding the risk of electric shock. On the other hand, it can avoid the risk of accidental closing of the circuit breaker 12 during maintenance due to operator error. The present invention can perform bidirectional synchronous control of the plug box by rotating the handle 14, and perform safety interlocking of the plug box locking foot 112 and the opening and closing mechanism 134, thereby reducing operational risks and improving the level of safety protection.

[0050] Specifically, the rotating handle 14 is equipped with a locking mechanism to fix the rotation position of the rotating handle 14.

[0051] Example 2:

[0052] In this embodiment, the connector 133 is a drive plate, connected between the drive plate 134a and the rack 1323. The drive plate is fixedly connected to the drive plate 134a, and the end of the drive plate facing away from the drive plate 134a is rotatably connected to the housing 100 by a detachable screw 1331. A slider 1332 is rotatably connected to the drive plate. The rack 1323 has a first groove 1323' that cooperates with the slider 1332. Under the horizontal sliding drive of the rack 1323, the drive plate rotates and swings around the detachable screw 1331 as the rotation center, and drives the drive plate 134a to slide towards the opening end. The slider 1332 slides along the opening direction of the first groove 1323'. This provides an emergency unlocking function for the locking foot 112 mechanism 11 of the plug-in box, preventing the circuit breaker 12 from burning out and affecting the movement of the locking foot 112 mechanism 11.

[0053] Example 3:

[0054] In this embodiment, the limiting movement of the limiting rod 131 is achieved by the following method: the outer edge of the cam 1321 is provided with a track groove, and the end of the limiting rod 131 near the cam 1321 is provided with a protrusion that cooperates with the track groove, so that the limiting rod 131 and the cam 1321 always maintain a movable connection. The remaining technical features are the same as in Embodiment 1, and will not be repeated here.

[0055] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A mechanically interlocked plug-in box, comprising a box body and a box body cover, wherein the interior of the box body is divided into a first chamber and a second chamber by end sealing plates, a locking foot mechanism is arranged in the first chamber, and a circuit breaker is arranged in the second chamber; characterized in that, The guide plate of the locking mechanism has a vertical groove on its surface; it also includes: a limiting rod, horizontally arranged in the first chamber, forming a limiting fit with the vertical groove, and one end extending axially into the second chamber for locking the guide plate; a linkage operation mechanism connected between the limiting rod and the circuit breaker for driving the limiting rod to release the limiting of the guide plate and simultaneously controlling the circuit breaker to open; and a closing / opening mechanism connected between the linkage operation mechanism and the circuit breaker for interlocking the circuit breaker's open state and preventing the circuit breaker from closing; the linkage operation mechanism includes: a cam arranged in the second chamber, whose rotation center is connected to a rotating handle on the housing cover plate via a vertical rotating shaft, for causing the limiting rod to slide axially under the drive of the rotating handle; and a gear and rack reversing assembly arranged between the vertical rotating shaft and the circuit breaker for converting the rotation of the vertical rotating shaft into a driving force. The circuit breaker opening and closing lever slides horizontally to perform the opening action; the opening and closing mechanism includes: a drive plate, arranged parallel to the rack of the gear and rack reversing assembly, and connected to the rack via a connector; a transverse lever, arranged on the track shaft of the opening and closing lever and connected to the drive plate, which pushes the circuit breaker opening and closing lever to the opening end or restricts it at the opening end under the drive of the drive plate; the connector is a drive coupling plate, connected between the drive plate and the rack; the drive coupling plate is fixedly connected to the drive plate, and the drive coupling plate is rotatably connected to the housing at one end away from the drive plate via a detachable screw; a slider is rotatably connected to the drive coupling plate; a first sliding groove is provided on the rack to cooperate with the slider; under the horizontal sliding action of the rack, the drive coupling plate rotates and swings around the detachable screw as the rotation center, and drives the drive plate to slide towards the opening end; the slider slides along the opening direction of the first sliding groove.

2. The mechanical interlocking plug-in box according to claim 1, characterized in that, The bottom end of the vertical slide groove is provided with a limiting hole, and the limiting rod is provided with a limiting block that cooperates with the limiting hole.

3. A mechanical interlocking plug-in box according to claim 2, characterized in that, The end of the limiting rod away from the cam is provided with a return spring. During the rotation and reset process of the cam, the return spring is used to restore the locking of the limiting rod to the guide plate.

4. A mechanical interlocking plug-in box according to claim 2, characterized in that, The outer edge of the cam is provided with a track groove, and the end of the limiting rod near the cam is provided with a protrusion that cooperates with the track groove, so that the limiting rod and the cam always remain in a movable connection.

5. A mechanical interlocking plug-in box according to claim 1, characterized in that, The rotating handle is equipped with a locking mechanism to fix the rotation position of the rotating handle.

6. A mechanical interlocking plug-in box according to claim 1, characterized in that, The gear and rack reversing assembly includes: a gear, fixed on the vertical rotating shaft and rotating about the rotation center of the vertical rotating shaft; a rack, plate-shaped, arranged parallel to the track shaft, and having a toothed groove on the side near the gear that meshes with the gear; and multiple horizontal grooves on the rack along the sliding direction of the rack; and a guide post, vertically fixed on the structural base of the housing, with its top passing through the horizontal grooves to limit the horizontal sliding of the rack.

7. A mechanical interlocking plug-in box according to claim 1, characterized in that, The opening and closing mechanism also includes a guide rod, which is arranged parallel to the track axis and slides in cooperation with the drive plate to provide guidance for the movement of the drive plate.

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