A five-prevention interlocking device for permanent magnet circuit breaker handcart

Abstract

The utility model relates to the field of circuit breaker handcart, specifically provides a five -proof interlocking device for permanent -magnetic circuit breaker handcart, including extension, transmission part and spacing box, extension connects on the lock plate of handcart, can rotate with the rotation of lock plate, the spacing box horizontal extension has spacing rod, spacing rod is located the path of extension rotation, transmission part one end and handcart switch -on -off switch pivot swing arm transmission connection, the other end with spacing rod transmission connection, swing arm rotation makes transmission part drive spacing rod leave the path of extension rotation, the utility model discloses the existing structure of permanent -magnetic circuit breaker handcart, can under not destroying the integrity of handcart condition, additionally set up the device, guarantee circuit breaker handcart movable when switching off, then cannot move when switching on from the physical structure level, let the permanent -magnetic circuit breaker handcart of no interlocking structure realize the two -way interlocking between handcart position and circuit breaker switch -on -off state, further increase the safety of permanent -magnetic circuit breaker handcart.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker trolleys, specifically providing a five-proof interlocking device for permanent magnet circuit breaker trolleys. Background Technology

[0002] The permanent magnet circuit breaker trolley uses a permanent magnet mechanism as its drive unit, featuring a bistable internal undervoltage release and an integrated design with a mechanical manual release, making manual tripping operation easier and more reliable. Compared to other traditional circuit breaker trolleys using spring-operated mechanisms, it uses fewer mechanical parts and has a simpler structure. Due to the simple structure of the permanent magnet circuit breaker trolley and its different transmission method compared to other traditional circuit breaker trolleys, in terms of achieving five-proof interlocking, the chassis and mechanism body generally use electrical signals to control the circuit breaker's opening, closing, and trolley position, which cannot achieve bidirectional mechanical re-interlocking. Furthermore, the interlocking structure of traditional spring-operated mechanisms is relatively complex and cannot be easily applied to permanent magnet circuit breaker trolleys.

[0003] Therefore, in order to further improve the safety of existing permanent magnet circuit breaker trolleys, there is an urgent need for a device that can achieve bidirectional interlocking between the trolley position and the circuit breaker status. Utility Model Content

[0004] To address the aforementioned problems, this invention provides a modular interlocking device that can be easily installed on a permanent magnet circuit breaker trolley, achieving bidirectional interlocking between the trolley position and the circuit breaker status. The specific technical solution is as follows:

[0005] A five-prevention interlocking device for a permanent magnet circuit breaker trolley includes an extension, a transmission component, and a limit box. The extension is connected to the lock plate of the trolley and can rotate with the lock plate. A limit rod extends horizontally from the limit box and is located on the rotation path of the extension. One end of the transmission component is connected to a swing arm on the opening and closing switch shaft of the trolley, and the other end is connected to the limit rod. The rotation of the swing arm causes the transmission component to drive the limit rod away from the rotation path of the extension.

[0006] In this solution, the extension unit is linked to the locking plate that controls the rotation of the hand crank shaft in the existing permanent magnet circuit breaker trolley. The transmission component is linked to the swing arm at the opening and closing switch. The state of the opening and closing switch is reflected on the limit box. The blocking rod on the limit box restricts the movement of the extension unit, thus restricting the movement of the locking plate. From a physical structural perspective, this ensures that the circuit breaker trolley cannot move when the circuit breaker is closed. Utilizing the existing structure of the permanent magnet circuit breaker, this device can be added without compromising the integrity of the permanent magnet circuit breaker trolley. This allows for bidirectional interlocking of the trolley position and the circuit breaker state in permanent magnet circuit breaker trolleys without interlocking structures, further enhancing the safety of the permanent magnet circuit breaker trolley.

[0007] Preferably, the limiting box has a mounting plate connected to its back side. The mounting plate fixes the limiting box to the handcart, positioned above the locking plate. The limiting rod is movably disposed within the limiting box, which contains an elastic member. This elastic member consistently provides a force to the limiting rod, preventing it from rotating away from the extension. The limiting box can be fixed to the inside of the handcart housing via the mounting plate, avoiding obstruction or interference with other structures.

[0008] Preferably, one side of the mounting plate is used to mount the limiting box, and the other side is provided with a guide plate. The extension is disposed in the gap between the guide plate and the mounting plate. This ensures that the extension can always move within the gap formed by the guide plate and the mounting plate when the locking plate rotates, without any deviation, and that the movement of the extension is blocked by the limiting rod.

[0009] Since the handcart's opening and closing switch is a certain distance from the locking plate, in order to physically transmit the action of the handcart's opening and closing switch to the limit box, and also to avoid setting up a complex transmission structure, preferably, the transmission component includes a brake cable. One end of the brake cable is fixedly connected to the top of the limit box, so that the core of the brake cable at that end passes through the limit box from the top. The other end of the brake cable is fixedly connected to the swing arm housing, so that the core of the brake cable at that end is fixedly connected to the swing arm.

[0010] In this design, the brake cable is flexible and will not interfere with other structures in the circuit breaker trolley. It is also lightweight and will not increase the weight of the circuit breaker trolley.

[0011] Preferably, the mounting plate and the limiting box are provided with the same elongated through hole, the limiting box body is provided with a vertical slide rail and a slider adapted to the vertical slide rail, the surface of the limiting box body and the mounting plate are provided with elongated through holes along the sliding direction of the slider, and the limiting rod is inserted into the limiting box body through the elongated through hole and fixedly connected to the slider.

[0012] In this scheme, the circuit breaker trolley's opening and closing switch is activated, which is the opening action. This tauts the brake cable, which pulls the slider along the slide rail. At the same time, it moves the limit rod upward, away from the rotation trajectory of the extension, allowing the extension to move freely. Only then can the restriction on the movement of the trolley by the locking plate be released.

[0013] Preferably, the slider is fixedly connected to the brake cable core, and the elastic component includes a pressure spring disposed in the limiting box. The pressure spring provides a downward pushing force to the slider, and the slider can maintain its position when the brake cable does not provide an upward pulling force, so that the limiting rod is always in the position of blocking the extension part. It is only after the brake is opened that the limiting rod can release the obstruction of the extension part by pulling the slider upward.

[0014] In another preferred embodiment, the mounting plate and the limiting box are provided with the same elongated through hole, one end of the limiting rod is hinged in the limiting box, and the other end extends out of the mounting plate from the elongated through hole, with the length direction of the elongated through hole being in the rotation plane of the limiting rod.

[0015] In this scheme, only when the circuit breaker trolley's opening and closing switch is activated, i.e., the opening action is performed, which tightens the brake cable. The brake cable pulls the limit rod upward to rotate away from the rotation trajectory of the extension section, releasing the obstruction to the extension section and allowing it to move freely. Only then can the locking plate release the restriction on the movement of the trolley.

[0016] Preferably, the brake cable core is fixedly connected to the end of the limiting rod, and the elastic member includes a torsion spring disposed at the hinge of the limiting rod. The torsion spring provides the limiting rod with a force that abuts against the end of the elongated through hole. The torsion spring ensures that the limiting rod remains in its current position when the brake cable does not provide upward tension, and it remains in the position blocking the extension. Only after the brake is released, and the brake cable pulls the limiting rod upward, causing it to rotate, can the limiting rod's obstruction of the extension be released.

[0017] Preferably, an indicator plate is provided on the side of the slider away from the limit rod. The upper and lower halves of the indicator plate are respectively provided with different indicator colors. A transparent observation window is provided on the surface of the limit box. The slider is moved by the brake cable, so that the transparent observation window displays the colors of different positions on the indicator plate. The observation window allows for a direct visual indication of whether the circuit breaker trolley is allowed to move, further improving the safety factor.

[0018] Preferably, the extension includes a first adjusting member, which includes a vertical height plate and a horizontal plate connected together. The vertical height plate is bolted to a locking plate. A vertical rotating plate is mounted on the horizontal plate. The rotating plate extends into the gap between the guide plate and the mounting plate. The limiting rod hinders the movement of the rotating plate.

[0019] In this scheme, since the locking plate positions in different models of permanent magnet circuit breaker trolleys are different, the height of the rotating plate is adapted to the limit box by setting vertical height plates in the first adjusting component of different heights. By setting horizontal plates of different lengths, the rotating plate can be positioned exactly in the gap between the guide plate and the mounting plate.

[0020] The beneficial effects of this utility model are as follows: The extension of this utility model is linked to the locking plate that controls the rotation of the hand crank shaft in the existing permanent magnet circuit breaker trolley, and the transmission component is linked to the swing arm at the opening and closing switch. The state of the opening and closing switch is reflected on the limit box. The blocking rod on the limit box restricts the movement of the extension, that is, restricts the movement of the locking plate. From the physical structure level, it ensures that the circuit breaker trolley cannot move when the circuit breaker is closed. The entire device utilizes the existing structure of the permanent magnet circuit breaker and can be added without destroying the integrity of the permanent magnet circuit breaker trolley. This allows the permanent magnet circuit breaker trolley without an interlocking structure to achieve bidirectional interlocking between the trolley position and the circuit breaker state, further increasing the safety of the permanent magnet circuit breaker trolley. Attached Figure Description

[0021] To more clearly illustrate the technical solution of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a three-dimensional schematic diagram of the present invention.

[0023] Figure 2 This is a schematic diagram of the limiting box of this utility model.

[0024] Figure 3 This is a schematic diagram of the internal structure of the limiting box of this utility model.

[0025] Figure 4 This is a side sectional view of the limiting box of this utility model.

[0026] Figure 5 This is a side sectional view of another embodiment of the limiting box of this utility model.

[0027] In the above figures, the corresponding reference numerals are as follows:

[0028] 1-Extension, 11-Vertical height plate, 12-Horizontal plate, 13-Rotating plate, 2-Transmission component, 21-Brake line, 3-Limit box, 31-Limit rod, 32-Mounting plate, 33-Elastic component, 34-Guide plate, 35-Long through hole, 36-Vertical slide rail, 37-Slider, 38-Indicator plate, 39-Observation window, 4-Locking plate, 5-Hand crank shaft, 6-Swing arm housing. Detailed Implementation

[0029] The technical solution of this utility model will be clearly and completely described in conjunction with the accompanying drawings and through specific implementation methods of the embodiments of this utility model.

[0030] Example 1:

[0031] A five-proof interlocking device for permanent magnet circuit breaker trolleys, such as Figure 1 and Figure 2 As shown, it includes an extension 1, a transmission component 2, and a limiting box 3. The extension 1 is connected to the locking plate 4 of the handcart and can rotate with the rotation of the locking plate 4. A limiting rod 31 extends horizontally from the limiting box 3. The limiting rod 31 is located on the rotation path of the extension 1. One end of the transmission component 2 is connected to the swing arm on the handcart's opening and closing switch shaft, and the other end is connected to the limiting rod 31. The rotation of the swing arm causes the transmission component 2 to drive the limiting rod 31 away from the rotation path of the extension 1 by rotation, translation, etc.

[0032] The extension 1 is linked to the locking plate 4, which controls the rotation of the hand crank shaft 5 in the existing permanent magnet circuit breaker trolley. By pressing down the locking plate 4, the hand crank shaft 5 in the permanent magnet circuit breaker trolley can be locked, preventing the hand crank shaft 5 from rotating and thus avoiding movement of the circuit breaker trolley. The transmission component 2 is linked to the swing arm at the opening and closing switch. The swing arm at the opening and closing switch is an existing structure that is fixedly connected to the switching shaft of the opening and closing switch. When switching between opening and closing, the swing arm swings with the rotation of the switching shaft. The blocking rod on the limit box 3 restricts the movement of the extension 1, and reflects the state of the opening and closing switch to the limit box 3, thus restricting the movement of the locking plate 4. From a physical structural perspective, this ensures that the circuit breaker trolley cannot move when the circuit breaker is closed. Furthermore, by utilizing the existing structure of permanent magnet circuit breakers, this device can be added without compromising the integrity of the permanent magnet circuit breaker trolley, enabling bidirectional interlocking between the trolley position and the circuit breaker status of permanent magnet circuit breaker trolleys that lack interlocking structures, thereby further enhancing the safety of permanent magnet circuit breaker trolleys.

[0033] Specifically, such as Figure 2 and Figure 3The limiting box 3 has a mounting plate 32 connected to its back. The limiting box 3 is fixed to the handcart via the mounting plate 32, positioned above the locking plate 4. Preferably, the mounting plate 32 is bolted to the inner wall of the handcart housing. The limiting rod 31 is movably disposed within the limiting box 3. An elastic member 33 is provided within the limiting box 3, which consistently provides a force to the limiting rod 31, preventing it from rotating away from the extension 1. The limiting box 3 can be fixed to the inner side of the handcart housing via the mounting plate 32, avoiding obstruction or interference with other structures. One side of the mounting plate 32 is used to mount the limiting box 3, and the other side is provided with a guide plate 34. The extension 1 is disposed in the gap between the guide plate 34 and the mounting plate 32. This ensures that the extension 1 can always move within the gap formed by the guide plate 34 and the mounting plate 32 as the locking plate 4 rotates, without deviation, and that the movement of the extension 1 is blocked by the limiting rod 31. Preferably, the extension 1 includes a first adjusting member, which includes a vertical height plate 11 and a horizontal plate 12 connected together. The vertical height plate is bolted to the locking plate 4. A vertical rotating plate 13 is mounted on the horizontal plate 12. The rotating plate 13 extends into the gap between the guide plate 34 and the mounting plate 32. The limiting rod 31 hinders the movement of the rotating plate 13. Since the position of the locking plate 4 is different in different models of permanent magnet circuit breaker trolleys, by setting the vertical height plate 11 of the first adjusting member with different heights, the height of the rotating plate 13 is adapted to the limiting box 3. By setting the horizontal plate 12 of different lengths, the rotating plate 13 is positioned exactly in the gap between the guide plate 34 and the mounting plate 32.

[0034] Furthermore, since the circuit breaker's opening and closing switch is a certain distance from the locking plate 4, in order to physically transmit the action of the circuit breaker's opening and closing switch to the limit box 3, and also to avoid setting up a complex transmission structure, the transmission component 2 includes a brake cable 21. One end of the brake cable 21 is fixedly connected to the top of the limit box 3, so that the core of the brake cable 21 at this end passes through the limit box 3 from the top. The other end of the brake cable 21 is fixedly connected to the swing arm housing 6, so that the core of the brake cable 21 at this end is fixedly connected to the swing arm. When the circuit breaker's handcart is closed, the swing arm is in the initial position, and at this time the brake cable 21 does not pull the limit rod 31. When the circuit breaker's handcart is opened, the swing arm moves with the rotation of the opening and closing switch shaft, pulling the brake cable 21. The brake cable 21 becomes taut and pulls the limit rod 31, causing the limit rod 31 to move upward and away from the rotation path of the extension 1. By using the brake cable 21 for transmission, it is ensured that the flexible brake cable 21 will not interfere with other structures in the circuit breaker truck, and at the same time, it is lightweight and will not increase the weight of the circuit breaker truck.

[0035] Example 2:

[0036] Based on Example 1, such as Figure 3 and Figure 4 As shown, the limiting rod 31 adopts a translational movement. The mounting plate 32 and the limiting box 3 are provided with the same elongated through hole 35. The limiting box 3 is provided with a vertical slide rail 36 and a slider 37 adapted to the vertical slide rail 36. The surface of the limiting box 3 and the mounting plate 32 are provided with elongated through holes 35 along the sliding direction of the slider 37. The limiting rod 31 is inserted into the limiting box 3 through the elongated through hole 35 and is fixedly connected to the slider 37.

[0037] Specifically, the slider 37 is fixedly connected to the core of the brake cable 21. The elastic component 33 includes a pressure spring disposed in the limiting box 3. The pressure spring provides a downward thrust to the slider 37, allowing the slider 37 to maintain its position when the brake cable 21 does not provide an upward pull. This ensures that the limiting rod 31 is always in the position blocking the extension 1, guaranteeing that the limiting rod 31 can only release the obstruction of the extension 1 after the circuit breaker trips and the brake cable 21 pulls the slider 37 upward. Only when the circuit breaker trips and the tripping switch is activated, causing the brake cable 21 to tighten, pulls the slider 37 along the slide rail, and simultaneously moves the limiting rod 31 upward, away from the rotation trajectory of the extension 1, allowing the extension 1 to move freely. Only then can the restriction on the movement of the tripping plate 4 be released.

[0038] Example 3:

[0039] Based on Example 1, and differing from Example 2, as follows: Figure 5 As shown, the mounting plate 32 and the limiting box 3 are provided with the same elongated through hole 35. One end of the limiting rod 31 is hinged in the limiting box 3, and the other end extends out of the mounting plate 32 from the elongated through hole 35. The length direction of the elongated through hole 35 is in the rotation plane of the limiting rod 31.

[0040] Specifically, the brake cable 21 is fixedly connected to the end of the limiting rod 31. The elastic member 33 includes a torsion spring disposed at the hinge of the limiting rod 31. The torsion spring provides the limiting rod 31 with a force that abuts against the end of the elongated through hole 35. The torsion spring ensures that the limiting rod 31 remains in its position when the brake cable 21 does not provide upward tension, and it is always in the position of blocking the extension 1. Only after the circuit breaker trips, when the brake cable 21 pulls the limiting rod 31 upward, causing the limiting rod 31 to rotate, can the obstruction of the extension 1 by the limiting rod 31 be released. Only when the circuit breaker truck trips the circuit breaker switch, i.e., the tripping action, does the brake cable 21 become taut, and the brake cable 21 pulls the limiting rod 31 upward to rotate away from the rotation trajectory of the extension 1, releasing the obstruction of the extension 1 and allowing the extension 1 to move freely. Only then can the restriction on the movement of the truck by the locking plate 4 be released.

[0041] Example 4:

[0042] This embodiment is based on embodiment two, such as... Figure 3 As shown, an indicator plate 38 is provided on the side of the slider 37 away from the limit rod 31. The upper and lower halves of the indicator plate 38 are respectively provided with different indicator colors. A transparent observation window 39 is provided on the surface of the limit box 3. The slider 37 is moved by the brake cable 21, allowing the transparent observation window 39 to display the colors of different positions on the indicator plate 38. Specifically, the observation window 39 is fixed to the surface of the limit box 3, and the upper half of the indicator plate 38 is the color indicating closing, while the lower half is the color indicating opening. When the brake cable 21 is not pulled, the slider 37 is pressed down by the pressure spring, so that the color indicating closing is revealed in the observation window 39; when opening, the brake cable 21 pulls the slider 37, causing the slider 37 to move upward, and the lower half of the indicator plate 38 indicating opening is revealed in the observation window 39. The observation window 39 allows for a direct visual indication of whether the circuit breaker trolley is allowed to move, further improving the safety factor.

[0043] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A five-prevention interlocking device for a permanent magnet circuit breaker trolley, characterized in that, The device includes an extension, a transmission component, and a limiting box. The extension is connected to the lock plate of the handcart and rotates with the lock plate. A limiting rod extends horizontally from the limiting box and is located on the rotation path of the extension. One end of the transmission component is connected to a swing arm on the handcart's opening / closing switch shaft, and the other end is connected to the limiting rod. Rotation of the swing arm causes the transmission component to drive the limiting rod away from the rotation path of the extension. The limiting box has a mounting plate connected to its back, which fixes the limiting box on the handcart above the lock plate. The limiting rod is movably disposed in the limiting box, which contains an elastic component that constantly provides a force to the limiting rod, preventing it from leaving the rotation path of the extension.

2. The five-proof interlocking device for a permanent magnet circuit breaker trolley according to claim 1, characterized in that, One side of the mounting plate is used to install the limiting box, and the other side is provided with a guide plate. The extension is disposed in the gap between the guide plate and the mounting plate.

3. The five-proof interlocking device for a permanent magnet circuit breaker trolley according to claim 2, characterized in that, The transmission component includes a brake cable. One end of the brake cable is fixedly connected to the top of the limiting box, so that the brake cable core passes through the limiting box from the top. The other end of the brake cable is fixedly connected to the swing arm housing, so that the brake cable core is fixedly connected to the swing arm.

4. A five-prevention interlocking device for a permanent magnet circuit breaker trolley according to claim 3, characterized in that, The mounting plate and the limiting box are provided with the same elongated through hole. The limiting box is provided with a vertical slide rail and a slider adapted to the vertical slide rail. The surface of the limiting box and the mounting plate are provided with elongated through holes along the sliding direction of the slider. The limiting rod is inserted into the limiting box through the elongated through hole and fixedly connected to the slider.

5. A five-prevention interlocking device for a permanent magnet circuit breaker trolley according to claim 4, characterized in that... The slider is fixedly connected to the brake cable core, and the elastic component includes a pressure spring disposed in the limiting box, which provides a downward thrust to the slider.

6. A five-proof interlocking device for a permanent magnet circuit breaker trolley according to claim 3, characterized in that, The mounting plate and the limiting box are provided with the same elongated through hole. One end of the limiting rod is hinged in the limiting box, and the other end extends out of the mounting plate from the elongated through hole. The length direction of the elongated through hole is in the rotation plane of the limiting rod.

7. A five-proof interlocking device for a permanent magnet circuit breaker trolley according to claim 6, characterized in that, The brake cable core is fixedly connected to the end of the limiting rod, and the elastic member includes a torsion spring disposed at the hinge of the limiting rod, the torsion spring providing the limiting rod with a force that abuts against the end of the elongated through hole.

8. A five-proof interlocking device for a permanent magnet circuit breaker trolley according to claim 5, characterized in that, An indicator plate is provided on the side of the slider away from the limiting rod. The upper and lower halves of the indicator plate are respectively provided with different indicator colors. A transparent observation window is provided on the surface of the limiting box. The slider is moved by the brake cable, so that the transparent observation window displays the colors of different positions on the indicator plate.

9. A five-proof interlocking device for a permanent magnet circuit breaker trolley according to claim 2, characterized in that, The extension includes a first adjusting member, which includes a vertical height plate and a horizontal plate connected together. The vertical height plate is bolted to a locking plate. A vertical rotating plate is mounted on the horizontal plate. The rotating plate extends into the gap between the guide plate and the mounting plate. The limiting rod hinders the movement of the rotating plate.

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