Magnetic control pole-mounted circuit breaker

Abstract

The utility model relates to a magnetic control pole-mounted circuit breaker, which comprises a shell, a pole, an upper insulating column, a lower insulating column, a brake rod, a locking piece and a guide loop, the lower insulation column is inserted into an inner cavity of the pole from the inside of the shell, the inner cavity of the pole is provided with a first wiring end, a first sliding groove is formed in the lower insulation column, the upper insulation column is inserted into the first sliding groove and connected with the lower insulation column in an up-down sliding mode, and the lower insulation column is connected with the upper insulation column through an elastic piece so as to support the upper insulation column at a specific position; the brake rod is fixedly connected with the lower end of the upper insulation column and inserted into the first sliding groove, the lower insulation column is provided with a second sliding groove which extends in the horizontal direction and is communicated with the first sliding groove, the locking piece is inserted into the second sliding groove to be horizontally and slidably connected with the lower insulation column, and the locking piece and the lower insulation column are arranged in a linkage mode. An elastic friction pad is arranged between the first end of the locking piece and the brake rod, the guide loop is fixed to the shell, and the second end of the locking piece is matched with the guide loop. And therefore, the use is convenient, and the cost is low.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker technology, and in particular to a magnetically controlled pole-mounted circuit breaker. Background Technology

[0002] Referring to Chinese Patent Application No. CN202310725717.1, there is a magnetically controlled pole-mounted circuit breaker. The working process of this circuit breaker is as follows: When the contact and the first terminal abut, the brake cylinder drives the first friction plate and the second friction plate to abut, and the second friction plate is tightly pressed against the brake rod to lock the brake rod in the second groove. When it is necessary to disconnect the circuit, because the brake rod is locked in the second groove, the magnetic control mechanism drives the lower insulating column, brake rod, upper insulating column, and brake cylinder to move downwards as a whole. At this time, when the contact and the first terminal disengage, it prevents the upper insulating column from rebounding under the action of the spring, thus lifting the circuit breaker. It features high power-off speed and increased power-off safety. After the circuit is disconnected, the brake cylinder eliminates its interaction with the first and second friction plates. The second friction plate is no longer tightly pressed against the brake lever, allowing the brake lever to slide up and down relative to the second sliding groove. At this time, the highest position of the upper insulating column, rebounded by the spring, is lower than the first terminal. When the circuit needs to be reconnected, the magnetic control mechanism drives the lower insulating column, brake lever, upper insulating column, and brake cylinder to move upward as a whole. After the contact and the first terminal come into contact, the magnetic control mechanism continues to drive the lower insulating column upward, compressing the spring and ensuring a tight fit between the contact and the first terminal, thus improving the stability of the transmitted current.

[0003] The aforementioned magnetically controlled pole-mounted circuit breaker requires a control brake pump during the up-and-down movement of the insulating column driven by the magnetic control mechanism. This control process is complex and can easily cause inconvenience in use. Furthermore, the use of a brake pump increases costs.

[0004] Therefore, there is an urgent need for an improved magnetically controlled pole-mounted circuit breaker. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a magnetically controlled pole-mounted circuit breaker that does not require the use of a brake pump, is convenient to use, and is low in cost.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, the main technical solutions adopted by this utility model include:

[0009] This utility model provides a magnetically controlled pole-mounted circuit breaker, including a housing, poles, an upper insulating pole, a lower insulating pole, a brake rod, a locking element, and a guide circuit with a unique path; the poles are fixedly installed on the top of the housing, the lower insulating pole is inserted into the inner cavity of the poles from the housing, the inner cavity of the poles has a first terminal, the lower insulating pole has a first sliding groove, the upper insulating pole is inserted into the first sliding groove and slidably connected to the lower insulating pole, and the lower insulating pole is connected to the upper insulating pole through an elastic element to support the upper insulating pole in a specific position;

[0010] The brake lever is fixedly connected to the lower end of the upper insulating column and inserted into the first sliding groove. The lower insulating column has a second sliding groove that extends horizontally and communicates with the first sliding groove. The locking member is inserted into the second sliding groove and slidably connected to the lower insulating column. The locking member and the lower insulating column are linked. An elastic friction pad is provided between the first end of the locking member and the brake lever. The guide circuit is fixed to the housing. The second end of the locking member cooperates with the guide circuit. During the process of the lower insulating column moving upward from the initial position to the energized position, the guide circuit guides the locking member to slide horizontally. The second end of the locking member never pushes the elastic friction pad to abut against the brake member. During the process of the lower insulating column moving downward from the energized position to the initial position, the guide circuit guides the locking member to slide horizontally. The second end of the locking member always pushes the elastic friction pad to abut against the brake member.

[0011] Optionally, the second end of the locking member has a guide portion, the locking member extends along a first horizontal direction, the guide portion extends along a second horizontal direction, the first direction and the second direction are perpendicular to each other, the guide loop is located on the plane containing the first direction and the vertical direction, and the guide portion is inserted into the guide loop and cooperates with the guide loop.

[0012] Optionally, the guide circuit is a groove structure fixed on the housing.

[0013] Optionally, the guide circuit includes a first passage and a second passage. The first passage is positioned closer to the lower insulating post than the second passage. Both the first and second passages extend vertically. The first passage protrudes towards the lower insulating post, while the second passage protrudes away from the lower insulating post. The upper end of the first passage is connected to the upper end of the second passage through a first connection, and the lower end of the first passage is connected to the lower end of the second passage through a second connection. During the process of the lower insulating post moving from its initial position to its energized position, the guide portion moves along the second passage from the second connection to the first connection. During the process of the lower insulating post moving from its energized position to its initial position, the guide portion moves along the first passage from the first connection to the second connection.

[0014] Optionally, the first and second pathways are interconnected to form a hexagonal or elliptical guide loop.

[0015] Optionally, a first guiding structure is provided at the first connection point, and a second guiding structure is provided at the second connection point; during the movement of the guide part along the guide loop, the first guiding structure allows the guide part to enter the second passage from the first passage, and the first guiding structure prevents the guide part from entering the first passage from the second passage, while the second guiding structure allows the guide part to enter the first passage from the second passage and prevents the guide part from entering the second passage from the first passage.

[0016] Optionally, the first passage is a groove, and the second passage is a second groove;

[0017] The first guide structure includes a first guide surface and a first blocking surface connected to the bottom of the second groove and sequentially connected along the direction of the second groove toward the first groove. The connection between the first guide surface and the first blocking surface is located closer to the opening of the second groove than the bottom of the second groove. During the movement of the guide part along the guide loop, the guide part can move along the first guide surface until it passes the first blocking surface and reaches the first connection point. At the first connection point, the guide part abuts against the first blocking surface. The first blocking surface prevents the guide part from entering the second groove, but allows the guide part to enter the first groove and move along the first groove.

[0018] The second guiding structure includes a second guiding surface and a second blocking surface connected to the bottom of the first groove and sequentially connected along the direction from the first groove to the second groove. The connection between the second guiding surface and the second blocking surface is located closer to the opening of the first groove than the bottom of the first groove. During the movement of the guide part along the guide loop, the guide part can move along the second guiding surface until it passes the second blocking surface and reaches the second connection point. At the second connection point, the guide part abuts against the second blocking surface. The second blocking surface prevents the guide part from entering the first groove, but allows the guide part to enter the second groove and move along the second groove.

[0019] Optionally, as the locking member moves along with the lower insulating post, the guide portion is always elastically pressed against the bottom of the groove in the guide circuit.

[0020] Optionally, the first slide rail includes a first sub-slide rail and a second sub-slide rail connected sequentially from top to bottom. The diameter of the first sub-slide rail is larger than that of the second sub-slide rail. The first sub-slide rail is connected to the second sub-slide rail through a stepped surface. The lower end of the upper insulating post is inserted into the first sub-slide rail. The upper end of the brake rod is inserted into the first sub-slide rail and fixedly connected to the upper insulating post. The lower end of the brake rod is inserted into the second sub-slide rail. The bottom of the upper insulating post is connected to the stepped surface through an elastic element.

[0021] (III) Beneficial Effects

[0022] The beneficial effects of this utility model are:

[0023] The magnetically controlled column-mounted circuit breaker provided in this embodiment does not require a brake cylinder. Under the action of the guide circuit, the upper insulating component is automatically locked by mechanical cooperation according to the working stroke of the lower insulating component. It is convenient to use and has a lower cost. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of a magnetically controlled column-mounted circuit breaker according to a specific embodiment, wherein the lower insulating column is in the energized position;

[0025] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0026] Figure 3 This is a schematic diagram of a magnetically controlled column-mounted circuit breaker according to a specific embodiment, wherein the lower insulating column is located at a certain position during the process of moving from the energized position to the initial position;

[0027] Figure 4 for Figure 3 Enlarged view of point B in the middle;

[0028] Figure 5 This is a schematic diagram of a magnetically controlled column-mounted circuit breaker according to a specific embodiment, wherein the lower insulating column is located at a certain position during the process of moving from the initial position to the energized position;

[0029] Figure 6 for Figure 5 Enlarged diagram of point C in the middle.

[0030] Explanation of reference numerals in the attached figures

[0031] 1: Shell;

[0032] 2: Pole post;

[0033] 21: First terminal; 22: Mating part;

[0034] 3: Upper insulating post;

[0035] 31: Contact;

[0036] 4: Lower insulating post;

[0037] 5: Elastic components;

[0038] 6: Magnetic control mechanism;

[0039] 7: Brake lever;

[0040] 8: Locking components;

[0041] 81: First friction pad; 82: Second friction pad;

[0042] 9: Guide loop;

[0043] 91: First passageway; 92: Second passageway; 93: First guide surface; 94: First blocking surface; 95: Second guide surface; 96: Second blocking surface. Detailed Implementation

[0044] To better explain and facilitate understanding of this utility model, a detailed description of its specific embodiments is provided below with reference to the accompanying drawings. In this document, the terms "upper" and "lower" refer to... Figure 1 The orientation is used as a reference.

[0045] like Figures 1 to 6 As shown, the magnetically controlled post-connected circuit breaker includes a housing 1, a pole 2, an upper insulating post 3, and a lower insulating post 4. The pole 2 is fixedly installed above the housing 1 and has a first terminal 21 and a second terminal (not shown in the figure). The lower insulating post 4 is inserted into the inner cavity of the pole 2 from inside the housing 1. The first terminal 21 has a mating part 22 located in the inner cavity of the pole 2, which is located above the lower insulating post 4. The lower insulating post 4 has a first sliding groove extending in the vertical direction. The upper insulating post 3 is inserted into the first sliding groove and slides vertically with the lower insulating post 4. The upper end of the upper insulating post 3 extends upward beyond the lower insulating post 4. The lower insulating post 4 is connected to the upper insulating post 3 through an elastic member 5 to support the upper insulating post 3 in a first position (the first position is the position of the upper insulating post 3 relative to the lower insulating post 4). The lower end of the lower insulating post 4 is connected to the magnetic control mechanism 6 located inside the housing 1, and the upper end of the upper insulating post 3 has a contact 31.

[0046] The working principle of the above-mentioned magnetically controlled column circuit breaker is as follows: When it is necessary to connect the circuit, the magnetic control mechanism 6 drives the lower insulating column 4 to move upward from the initial position. Due to the supporting effect of the elastic element 5, the upper insulating element will move upward together with the lower insulating element. After the contact 31 and the mating part 22 abut, the magnetic control mechanism 6 continues to drive the lower insulating column 4 to move upward to the energized position. The elastic element 5 yields, and the upper insulating column 3 moves to the second position (the second position is the position of the upper insulating column 3 relative to the lower insulating column 4), so that the contact 31 and the mating part 22 fit tightly and improve the stability of the transmitted current. When the circuit needs to be disconnected, the magnetic control mechanism 6 drives the lower insulating post 4 to move downward. Initially, due to the yielding and recovery of the elastic element 5, the upper insulating post 3 gradually moves from the second position to the first position. The contact 31 and the mating part 22 will remain in contact until the lower insulating post 4 moves downward and the upper insulating post 3 returns to the first position. At this time, the magnetic control mechanism 6 drives the lower insulating post 4 to continue to move downward, and the contact 31 and the mating part 22 will disengage. The power disconnection speed is slow, and the contact 31 after disengagement may rebound under the action of the elastic element 5 and re-engage with the mating part 22, resulting in an unsafe power disconnection. The lower insulating post 4 moves downward to the initial position, and the power disconnection is completed.

[0047] It should be noted that when the magnetically controlled circuit breaker is normally energized, the contact 31 and the mating part 22 abut against each other, and the current in the first terminal 21 flows through the contact 31 to the second terminal.

[0048] To improve power-off speed and safety, the magnetically controlled pole-mounted circuit breaker provided in this embodiment also includes a brake rod 7, a locking member 8, and a guide circuit 9 with a unique path. The brake rod 7 and the upper insulating column 3 are fixedly connected from bottom to top. The brake rod 7 is inserted into the first sliding groove, and the lower end of the brake rod 7 is located inside the housing 1. A second sliding groove extending horizontally is opened on the lower insulating column 4. The second sliding groove communicates with the first sliding groove. The locking member 8 is inserted into the second sliding groove and slides horizontally with the lower insulating column 4. The locking member 8 and the lower insulating column 4 are linked. An elastic friction pad is provided between the first end of the locking member 8 and the brake rod 7. The guide circuit 9 is fixed on the housing 1, and the second end of the locking member 8 cooperates with the guide circuit 9. The locking member 8 moves with the lower insulating column 4 for one working stroke, driving the second end of the locking member 8 to always move along the guide circuit 9 in a unique clockwise rotation direction and move around the guide circuit 9 for one revolution. The working stroke is the movement of the lower insulating column 4 from the initial position to the energized position and back to the initial position. During the process of the lower insulating post 4 moving from the initial position to the energized position, the guide circuit 9 guides the locking member 8 to slide horizontally, and the second end of the locking member 8 never pushes the elastic friction pad to abut against the brake member; when the lower insulating post 4 is in the energized position, the guide circuit 9 causes the second end of the locking member 8 to push the elastic friction pad to abut against the brake member; during the process of the lower insulating post 4 moving from the energized position to the initial position, the guide circuit 9 guides the locking member 8 to slide horizontally, and the second end of the locking member 8 always pushes the elastic friction pad to abut against the brake member; when the lower insulating post 4 is in the initial position, the guide circuit 9 begins to cause the second end of the locking member 8 to allow the elastic friction pad to disengage from the brake member.

[0049] The working principle of this magnetically controlled column-mounted circuit breaker is as follows: When the circuit needs to be connected, the magnetic control mechanism 6 drives the lower insulating column 4 from the initial position to the energized position. During this process, the guide circuit 9 guides the second end of the locking member 8 to remain in contact with the elastic friction pad and the braking member. The upper insulating member, located in the first position, moves upward along with the lower insulating member. After the contact 31 and the mating part 22 abut, the magnetic control mechanism 6 continues to drive the lower insulating column 4 upward to the energized position. The elastic member 5 yields, and the upper insulating column 3 moves to the second position, making the contact 31 and the mating part 22 fit tightly, improving the stability of the transmitted current. When the lower insulating column 4 is in the energized position, the guide circuit 9 causes the second end of the locking member 8 to push the elastic friction pad to abut with the braking member, locking the upper insulating column 3 in the second position. When the circuit needs to be disconnected, the magnetic control mechanism 6 drives the lower insulating post 4 to move from the energized position to the initial position. During this process, the guide circuit 9 guides the locking member 8 to slide horizontally. The second end of the locking member 8 always pushes the elastic friction pad against the braking member, thus locking the upper insulating post 3 in the second position. The contact 31 will initially follow the lower insulating post 4 downwards, causing the contact 31 to disengage from the mating part 22, resulting in a fast power-off speed. When the lower insulating post 4 is in the initial position, the guide circuit 9 begins to cause the second end of the locking member 8 to allow the elastic friction pad to disengage from the braking member. Due to the yielding and recovery of the elastic member 5, the upper insulating post 3 moves from the second position to the first position. Even if the contact 31 rebounds, it is difficult for it to interact with the mating part 22, making the power-off safer.

[0050] The magnetically controlled column-mounted circuit breaker provided in this embodiment does not require a brake cylinder. Under the action of the guide circuit 9, the upper insulating component is automatically locked by mechanical cooperation according to the working stroke of the lower insulating component. It is convenient to use and has a lower cost.

[0051] Preferably, the second end of the locking member 8 has a guide portion, the locking member 8 extends along a first horizontal direction, the guide portion extends along a second horizontal direction, the first direction and the second direction are perpendicular to each other, the guide circuit 9 is located on the plane containing the first direction and the vertical direction, and the guide portion is inserted into the guide circuit 9 and cooperates with the guide circuit 9.

[0052] More preferably, in this embodiment, the guide circuit 9 is a groove structure fixed on the housing 1.

[0053] Preferably, the guide circuit 9 includes a first passage 91 and a second passage 92. The first passage 91 is positioned closer to the lower insulating post 4 than the second passage 92. Both the first passage 91 and the second passage 92 extend vertically. The first passage 91 protrudes towards the lower insulating post 4, and the second passage 92 protrudes away from the lower insulating post 4. The upper end of the first passage 91 is connected to the upper end of the second passage 92 through a first connection, and the lower end of the first passage 91 is connected to the lower end of the second passage 92 through a second connection. During the process of the lower insulating post 4 moving from the initial position to the energized position, the guide part moves along the second passage 92 from the second connection to the first connection. When the lower insulating post 4 is in the energized position, the guide part is located at the first connection. During the process of the lower insulating post 4 moving from the energized position to the initial position, the guide part moves along the first passage 91 from the first connection to the second connection. When the lower insulating post 4 is in the initial position, the guide part is located at the second connection.

[0054] More preferably, the first passage 91 and the second passage 92 are interconnected to form a hexagonal guide loop 9. Optionally, the first passage 91 and the second passage 92 are interconnected to form an elliptical guide loop 9.

[0055] Preferably, a first guiding structure is provided at the first connection point, and a second guiding structure is provided at the second connection point; during the movement of the guide part along the guide loop 9, the first guiding structure allows the guide part to enter the second passage 92 from the first passage 91, and the first guiding structure prevents the guide part from entering the first passage 91 from the second passage 92, while the second guiding structure allows the guide part to enter the first passage 91 from the second passage 92, and the second guiding structure prevents the guide part from entering the second passage 92 from the first passage 91.

[0056] Preferably, the first passage 91 is a groove, and the second passage 92 is a second groove; the first guide structure includes a first guide surface 93 and a first blocking surface 94 connected to the bottom of the second groove and sequentially connected along the direction from the second groove to the first groove. The connection between the first guide surface 93 and the first blocking surface 94 is located closer to the opening of the second groove than the bottom of the second groove. During the movement of the guide part along the guide loop 9, the guide part can move along the first guide surface until it passes the first blocking surface 94 and reaches the first connection point. At the first connection point, the guide part abuts against the first blocking surface 94, and the first blocking surface 94 prevents the guide part from entering the second groove, allowing the guide part to enter the first groove. The guide part moves along the first groove; the second guide structure includes a second guide surface 95 and a second blocking surface 96 connected to the bottom of the first groove and sequentially connected along the direction from the first groove to the second groove. The connection between the second guide surface 95 and the second blocking surface 96 is set closer to the opening of the first groove than the bottom of the first groove. During the movement of the guide part along the guide loop 9, the guide part can move along the second guide surface until it passes the second blocking surface 96 and reaches the second connection point. At the second connection point, the guide part abuts against the second blocking surface 96. The second blocking surface 96 prevents the guide part from entering the first groove, but allows the guide part to enter the second groove and move along the second groove.

[0057] More preferably, during the movement of the locking member 8 following the lower insulating post 4 for one working stroke, the guide portion is always elastically pressed against the bottom of the groove in the guide circuit 9. The elastic force on the guide portion can be provided by the locking member 8 itself.

[0058] Preferably, the first slide groove includes a first sub-slide groove and a second sub-slide groove connected sequentially from top to bottom. The diameter of the first sub-slide groove is larger than that of the second sub-slide groove. The first sub-slide groove is connected to the second sub-slide groove through a stepped surface. The lower end of the upper insulating post 3 is inserted into the first sub-slide groove. The upper end of the brake rod 7 is inserted into the first sub-slide groove and fixedly connected to the upper insulating post 3. The lower end of the brake rod 7 is inserted into the second sub-slide groove. The bottom of the upper insulating post 3 is connected to the stepped surface through an elastic element 5. Further, in this embodiment, the elastic element 5 is a spring sleeved on the brake rod 7.

[0059] Preferably, a friction pad receiving groove is provided on the inner wall of the second sub-slide groove, the friction pad receiving groove is connected to the second slide groove, and the elastic friction pad includes a first friction pad 81 and a second friction pad 82. The first friction pad 81 is located in the second slide groove, the second friction pad 82 is located in the friction pad receiving groove, and the size of the second friction pad 82 is larger than that of the first friction pad 81.

[0060] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0061] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0062] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0063] In the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0064] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A magnetic column on-break circuit breaker, characterized by, The application relates to a circuit breaker comprising a housing, a pole, an upper insulating column, a lower insulating column, a brake lever, a locking piece and a guide loop with a unique path. The pole is fixedly installed above the housing, the lower insulating column is inserted into the inner cavity of the pole from the housing, the inner cavity of the pole is provided with a first wiring end, a first sliding groove is formed in the upper insulating column, the upper insulating column is inserted into the first sliding groove and is in sliding connection with the lower insulating column in the up-down direction, and the lower insulating column is connected with the upper insulating column through elastic elements to support the upper insulating column at a specific position. The brake lever is fixedly connected with the lower end of the upper insulating column and is inserted into the first sliding groove, a second sliding groove is formed in the lower insulating column and extends in the horizontal direction and is communicated with the first sliding groove, the locking piece is inserted into the second sliding groove and is in horizontal sliding connection with the lower insulating column, the locking piece is arranged in linkage with the lower insulating column, an elastic friction pad is arranged between the first end of the locking piece and the brake lever, the guide loop is fixed on the housing, and the second end of the locking piece is matched with the guide loop. In the process that the lower insulating column moves upwards from the initial position to the energizing position, the guide loop guides the horizontal sliding of the locking piece, and the second end of the locking piece does not always push the elastic friction pad to abut against the brake lever; in the process that the lower insulating column moves downwards from the energizing position to the initial position, the guide loop guides the horizontal sliding of the locking piece, and the second end of the locking piece always pushes the elastic friction pad to abut against the brake lever.

2. The magnetic column on-break circuit breaker of claim 1, wherein, The second end of the locking piece is provided with a guide part, the locking piece extends in a first direction in the horizontal direction, the guide part extends in a second direction in the horizontal direction, the first direction is perpendicular to the second direction, the guide loop is located on the plane formed by the first direction and the up-down direction, and the guide part is inserted into the guide loop and matched with the guide loop.

3. The magnetic column on-break circuit breaker of claim 1 or 2, wherein, The guide loop is a groove structure fixed on the housing.

4. The magnetic column on-break circuit breaker of claim 2, wherein, The guide loop comprises a first channel and a second channel, the first channel is arranged close to the lower insulating column relative to the second channel, the first channel and the second channel both extend in the up-down direction, the first channel is arranged to protrude towards the direction close to the lower insulating column, the second channel is arranged to protrude towards the direction away from the lower insulating column, the upper end of the first channel is communicated with the upper end of the second channel through a first communication part, and the lower end of the first channel is communicated with the lower end of the second channel through a second communication part. In the process that the lower insulating column moves from the initial position to the energizing position, the guide part moves along the second channel from the second communication part to the first communication part; in the process that the lower insulating column moves from the energizing position to the initial position, the guide part moves along the first channel from the first communication part to the second communication part.

5. The magnetic column on-break circuit breaker of claim 4, wherein, The first channel and the second channel are communicated with each other to form a hexagonal or elliptical guide loop.

6. The magnetic column on-break circuit breaker of claim 4, wherein, The first communication part is provided with a first guide structure, the second communication part is provided with a second guide structure, in the process that the guide part moves along the guide loop, the first guide structure allows the guide part to enter the second channel from the first channel, the first guide structure prevents the guide part from entering the first channel from the second channel, the second guide structure allows the guide part to enter the first channel from the second channel, and the second guide structure prevents the guide part from entering the second channel from the first channel.

7. The magnetic column on-break circuit breaker of claim 6, wherein, The first channel is a groove, and the second channel is a second groove. The first guiding structure comprises a first guiding surface and a first blocking surface connected to the bottom of the second groove in sequence in the direction of the first groove, and the connection of the first guiding surface and the first blocking surface is arranged closer to the opening of the second groove than the bottom of the second groove; during the movement of the guiding part along the guiding loop, the guiding part can move along the first guiding surface until it passes the first blocking surface to reach the first communication position, at which the guiding part abuts against the first blocking surface, the first blocking surface prevents the guiding part from entering the second groove, and allows the guiding part to enter the first groove and move along the first groove; The second guiding structure comprises a second guiding surface and a second blocking surface connected to the bottom of the first groove in sequence in the direction of the second groove, and the connection of the second guiding surface and the second blocking surface is arranged closer to the opening of the first groove than the bottom of the first groove; during the movement of the guiding part along the guiding loop, the guiding part can move along the second guiding surface until it passes the second blocking surface to reach the second communication position, at which the guiding part abuts against the second blocking surface, the second blocking surface prevents the guiding part from entering the first groove, and allows the guiding part to enter the second groove and move along the second groove.

8. The magnetic column on-break circuit breaker of claim 7, wherein, During the movement of the locking member following the lower insulating column, the guiding part always abuts against the groove bottom of the guiding loop under the elastic action.

9. The magnetic column on-break circuit breaker of claim 1, wherein, The first sliding groove comprises a first sub-sliding groove and a second sub-sliding groove connected in sequence from top to bottom, the caliber of the first sub-sliding groove is larger than that of the second sub-sliding groove, the first sub-sliding groove is connected to the second sub-sliding groove through a stepped surface, the lower end of the upper insulating column is inserted into the first sub-sliding groove, the upper end of the brake lever is inserted into the first sub-sliding groove and fixedly connected to the upper insulating column, the lower end of the brake lever is inserted into the second sub-sliding groove, and the bottom of the upper insulating column is connected to the stepped surface through an elastic member.

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