A kind of anti-burn primary and secondary fusion sleeve circuit breaker

Abstract

The present application relates to the technical field of circuit breaker, in particular to a kind of anti-burning primary and secondary fusion sleeve column circuit breaker, including circuit breaker main body, three isolation gates, three contact springs, rotary drive mechanism and mounting frame, the anti-burning primary and secondary fusion sleeve column circuit breaker, when front blade is clamped in two contact springs, two contact springs can be pushed in by outward pushing mechanism, so that two contact springs clamp front blade, solve the loss of self spring force caused by long-term use of contact spring.When front blade and rear blade are bent due to rust block, front blade rotates, and front blade will form rotary cutting with the rust block of contact spring, which will gradually break the rust block, reduce the resistance when the isolation blade is lifted. And this rotary cutting method can produce pulling friction, avoid lifting the rust block, avoid the isolation blade and the rust block to produce more gap.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit breakers, and in particular to a burn-proof primary and secondary fusion sleeve column mounted circuit breaker. Background Art

[0002] The primary and secondary fused pole-mounted circuit breakers are prone to gaps and misalignment between the isolating blades and contacts under the action of electrical forces. This can cause arcing between the isolating blades and contacts, ultimately burning them. This gap is primarily caused by the loss of elasticity in the contact springs over time. Furthermore, the contact springs, exposed to outdoor conditions, inevitably rust at the contact points with the isolating blades, leading to adhesion. This creates significant resistance when the switch is rotated and lifted, preventing the isolating blades from lifting. Forcible lifting can also dislodge rust from between the isolating blades and the contact springs. This rust is then removed by workers, widening the gap between the isolating blades and the contact springs when they re-enter the circuit breaker, leading to arcing and burns. Furthermore, the forced lifting process requires workers to climb onto the pole, preventing the circuit breaker from automatically shutting off the power. If power is not shut off promptly, the circuit breaker can still burn out due to the high load. Moreover, the process of workers rushing to the scene and climbing up the electric poles takes a long time, and the power outage process is more dangerous.

[0003] Therefore, it is necessary to design a burn-proof primary and secondary fusion sleeve column circuit breaker, which can avoid the loss of self-elasticity of the contact spring due to long-term use. At the same time, when the isolation blade plate and the contact spring plate are rusted and adhered, the resistance encountered when the isolation blade plate is lifted can be reduced, and the rust can be reduced, thereby avoiding a large gap between the isolation blade plate and the rust. Summary of the Invention

[0004] In view of the above-mentioned technical deficiencies, the purpose of the present invention is to provide a burn-proof primary and secondary fusion sleeve column circuit breaker, which can avoid the loss of self-elasticity of the contact springs due to long-term use. At the same time, when the isolation blade plate and the contact spring plate are rusted and adhered, the resistance encountered when the isolation blade plate is lifted can be reduced, and the rust can be reduced, thereby avoiding the formation of a large gap between the isolation blade plate and the rust block.

[0005] In order to achieve the above object, the present application adopts the following technical scheme: the present application provides a kind of anti-burn primary and secondary fusion sleeve circuit breaker, including circuit breaker main body, three isolation gates, three contact springs, rotary drive mechanism and mounting frame, mounting frame is fixedly connected with circuit breaker main body, three conducting rods are provided on circuit breaker main body, three contact springs are fixedly installed on mounting frame, three isolation gates are used to connect three conducting rods with contact spring respectively, each isolation gate includes front blade, back blade and elastic straightening mechanism, one end of back blade is hinged with conducting rod, the other end of back blade is hinged with front blade, elastic straightening mechanism is fixedly installed on back blade, oblique slot one is formed in front blade, elastic straightening mechanism is provided with push column one capable of being pushed horizontally, when push column one is in contact with the bottom of oblique slot one, the top of back blade is parallel to the top of front blade.

[0006] Preferably, the two sides of the back blade are symmetrically provided with an outer pushing mechanism, the contact spring is divided into two half spring pieces, each half spring piece corresponds to an outer pushing mechanism, and the outer pushing mechanism is used to push the two contact spring pieces outward.

[0007] Preferably, each outer pushing mechanism includes a bent plate, an elastic inner pushing mechanism, a push column two, a guide plate and a sliding block, the contact spring is fixedly installed on the elastic seat of the elastic inner pushing mechanism, one end of the bent plate is fixedly connected with the contact spring, the guide plate is fixedly installed on the back blade, the front blade is rotatably connected with the guide plate, a strip-shaped accommodating groove is formed in the guide plate, the width of the sliding block is less than the width of the strip-shaped accommodating groove, the sliding block is located in the strip-shaped accommodating groove, two oblique grooves two are formed in the guide plate, two sliding columns fixedly provided on the sliding block are inserted into the oblique grooves two, the push column two is fixedly installed on the sliding block, the end portion of the sliding block passes through the guide plate and contacts the bent plate, an avoiding hole is formed in the guide plate for the end portion of the sliding block to pass through, and one side of the sliding block contacts the push column one.

[0008] Preferably, the elastic inner pushing mechanism includes a guide seat one, a sliding seat, a guide column one, a spring one and a limiting circular plate, the sliding seat is slidably installed on the guide seat one, the half spring piece is fixedly installed on the sliding seat, the guide column one is slidably connected with the guide seat one, a guide plate is fixedly provided on the guide seat one for guiding the guide column one, the spring one is used to provide an elastic force of the contact spring towards the front blade, and the limiting circular plate is fixedly installed on the end portion of the guide column one.

[0009] Preferably, the elastic straightening mechanism further includes symmetrically arranged elastic seats, each elastic seat includes a displacement plate, a guide column two, a spring two, a guide seat three and a reinforcing frame, one end of the displacement plate is fixedly connected with the push column one, the guide column two is fixedly connected with the other end of the displacement plate, the guide seat three is fixedly installed on the side surface of the back blade, the guide column two is slidably connected with the guide seat three, the spring two is used to apply an elastic force of the displacement plate away from the guide seat three, the reinforcing frame is connected to the side surface of the displacement plate and the tail portion of the guide column two, and a guide hole is formed in the outer edge of the displacement plate for the push column two to pass through.

[0010] Preferably, the rotating driving mechanism comprises an isolation rotating shaft, an isolation pull rod and a main crank, one end of the main crank is fixedly installed on the isolation rotating shaft, the other end of the main crank is hingedly connected with the bottom of the isolation pull rod, and the top of the isolation pull rod is hingedly connected with the rear blade.

[0011] Preferably, a reset mechanism is fixedly arranged on the mounting frame, the reset mechanism is used for providing a rotating pushing force for the isolation rotating shaft, and the reset mechanism comprises a secondary crank and an extension rod, one end of the secondary crank is fixedly installed on the isolation rotating shaft, the other end of the secondary crank is rotationally connected with the extension rod, and one end of the extension rod is hingedly connected with the mounting frame.

[0012] The application has the advantages that when the front blade is clamped on the two contact spring sheets, the two contact spring sheets can be pushed inward by the outward pushing mechanism, so that the two contact spring sheets clamp the front blade, and the loss of the elastic force of the contact spring sheet due to long-term use is solved.

[0013] When the front blade and the rear blade are bent due to rust blocks, the front blade rotates, and the front blade cuts the rust blocks of the contact spring sheet in a rotating manner, which breaks the rust blocks one by one, reduces the resistance when the isolation blade is lifted, and generates pulling friction in the rotating cutting manner, avoids lifting the rust blocks as a whole, and avoids a large gap between the isolation blade and the rust blocks.

[0014] When the front blade and the rear blade are bent, the outward pushing mechanism adaptively pushes the contact spring sheet outward, so that the two contact spring sheets and the front blade generate a pulling force, and the displacement distance of the contact spring sheet is small, so that the rust blocks are not pulled apart. In this way, the front blade and the contact spring sheet are more easily separated due to the pulling and sawing friction between the two sides.

[0015] The outward pushing mechanism does not use an electric control manner, the overall structure is small and exquisite, and the contact spring sheet can be adaptively pushed outward at the moment when the front blade and the rear blade are bent. Moreover, the outward movement distance of the pushing column is limited by the slope of the inclined groove, and the distance can be set to be small, so that the contact spring sheet is not excessively pulled outward. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only show some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort.

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0018] Figure 2 This is the main view before and after switching to this state.

[0019] Figure 3 It is a schematic diagram of the local three-dimensional structure of the present invention.

[0020] Figure 4 It is a schematic diagram of the partial three-dimensional structure tapping of the present invention.

[0021] Figure 5 This is a schematic diagram of the installation status of the elastic straightening mechanism and the front blade.

[0022] Figure 6 Schematic diagram of the decomposed state of the extrapolation mechanism.

[0023] Figure 7 It is a schematic diagram of the three-dimensional structure of the elastic inward push mechanism.

[0024] Figure 8 It is a schematic diagram of the three-dimensional structure of the rotary drive mechanism.

[0025] Figure 9 It is a schematic diagram of the three-dimensional structure of the reset mechanism.

[0026] Explanation of the accompanying symbols: 1. Circuit breaker body; 1a. Conductive rod; 2. Front blade; 2a. Bevel groove 1; 3. Rear blade; 4. Contact spring; 5. Rotary drive mechanism; 5a. Isolation rotating shaft; 5b. Isolation pull rod; 5c. Main crank arm; 6. Elastic straightening mechanism; 6a. Push column 1; 6b. Displacement plate; 6c. Guide column 2; 6d. Spring 2; 6e. Guide seat 3; 6f. Reinforcement frame; 7. Mounting frame; 8. Outward push mechanism; 8a. Bending plate; 8b. Elastic inward push mechanism; 8b1. Guide seat 1; 8b2. Sliding seat; 8b3. Guide column 1; 8b4. Spring 1; 8b5. Limiting circular plate; 8c. Push column 2; 8e. Guide plate; 8e1. Bevel groove 2; 8f. Sliding block; 8h. Sliding column; 9. Resetting mechanism; 9a. Auxiliary crank arm; 9b. Telescopic rod. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] Embodiment: The present invention provides a burn-proof primary and secondary fusion sleeve column circuit breaker, such as Figure 1-5As shown, it includes a circuit breaker body 1, three isolating blades, three contact springs 4, a rotation drive mechanism 5 and a mounting frame 7. The mounting frame 7 is fixedly connected to the circuit breaker body 1. Three conductive rods 1a are provided on the circuit breaker body 1. The three contact springs 4 are fixedly mounted on the mounting frame 7. The three isolating blades are respectively used to connect the three conductive rods 1a with the contact springs 4. Each isolating blade includes a front blade plate 2, a rear blade plate 3 and an elastic straightening mechanism 6. One end of the rear blade plate 3 is hinged to the conductive rod 1a, and the other end of the rear blade plate 3 is hinged to the front blade plate 2. The elastic straightening mechanism 6 is fixedly mounted on the rear blade plate 3. An inclined slot 2a is provided on the front blade plate 2. The elastic straightening mechanism 6 is provided with a push column 6a that can be pushed horizontally. Horizontally pushed by the push column 6a, when the push column 6a contacts the bottom of the inclined slot 2a, the top of the rear blade plate 3 is parallel to the top of the front blade plate 2. At this time, no bending occurs between the front blade plate 2 and the rear blade plate 3. During the process of the front blade 2 rotating and snapping into the contact spring 4, the front blade 2 cannot bend upwards due to the resistance of the push column 1 6a to the front blade 2, that is, there is sufficient supporting force during the snapping of the front blade 2. When the front blade 2 needs to be separated from the contact spring 4, due to rust between the front blade 2 and the contact spring 4, when the front blade 2 is lifted upward, if the resistance is small, the elastic straightening mechanism 6 will not be compressed. However, if the resistance is large, the elastic straightening mechanism 6 will be compressed, and the front blade 2 and the rear blade 3 will bend. Figure 2 As shown, the state transitions from the upper diagram to the lower diagram. During this transition, the front blade 2 rotates, creating a rotary cutting pattern with the rust blocks on the contact spring 4. This pattern breaks up the rust blocks point by point, reducing the resistance encountered when the isolation blade is lifted. This rotary cutting pattern also creates pulling friction, preventing the entire rust block from being lifted and preventing a large gap between the isolation blade and the rust block.

[0029] As the front blade 2 and the rear blade 3 continue to rotate and lift, the front blade 2 will form a sawing motion with the contact spring 4, reducing the resistance between the front blade 2 and the contact spring 4 and providing sawing friction on the rusted area of ​​the contact spring 4, further reducing the risk of lifting the entire rust block. Once the contact spring 4 and the front blade 2 separate, the elastic straightening mechanism 6 will push the front blade 2 back to its original position, preparing for the next rotation of the front blade 2 to engage the contact spring 4.

[0030] Although the above method can solve the problem of rust, it cannot solve the problem of loss of elasticity of the contact spring due to long-term use. Even if the front blade 2 is used to reduce the rust blocks on the contact spring 4, there is still a probability that the contact surface of the contact spring 4 will be worn thin during the sawing and friction process. Figure 4As shown, the two sides of the rear blade 3 are symmetrically fixed with an outward pushing mechanism 8, and the contact spring 4 is divided into two half-side springs, each half-side spring corresponds to an outward pushing mechanism 8, and the outward pushing mechanism 8 is used to push the two contact springs 4 to move outward. When the front blade 2 and the rear blade 3 are bent, the two outward pushing mechanisms 8 will simultaneously push the two contact springs 4 to move outward. By pushing the two contact springs 4 outward by the outward pushing mechanism 8, a pulling force will be generated between the two contact springs 4 and the front blade 2, and the displacement distance of the contact spring 4 is small, which prevents the rust block from being torn. In this way, during the sawing friction process, the front blade 2 and the contact spring 4 are also subjected to pulling forces from two sides, making it easier to separate the front blade 2 and the contact spring 4. And when the front blade 2 is stuck on the two contact springs 4, the two contact springs 4 can be pushed inward by the outward pushing mechanism 8, so that the two contact springs 4 clamp the front blade 2, solving the problem of loss of self-elasticity of the contact springs due to long-term use.

[0031] Since the push mechanism 8 needs to adaptively push the contact spring 4 outward when the front blade 2 and the rear blade 3 are bent, and the displacement distance is small, it is difficult to use an electronic control device for control operation. Figure 4 and Figure 6 As shown, each outward pushing mechanism 8 includes a bent plate 8a, an elastic inward pushing mechanism 8b, a second pushing column 8c, a guide plate 8e and a slider 8f. The contact spring 4 is fixedly mounted on the elastic seat of the elastic inward pushing mechanism 8b. One end of the bent plate 8a is fixedly connected to the contact spring 4. The guide plate 8e is fixedly mounted on the rear blade plate 3. The front blade 2 is rotatably connected to the guide plate 8e, that is, a rotational connection is formed between the rear blade 3 and the front blade 2. A strip-shaped accommodating groove is provided on the guide plate 8e. The width of the slider 8f is smaller than the width of the strip-shaped accommodating groove. The slider 8f is located in the strip-shaped accommodating groove. Two oblique grooves 8e1 are provided on the guide plate 8e. Two sliding columns 8h inserted into the second oblique groove 8e1 are fixedly provided on the slider 8f. The second pushing column 8c is fixedly mounted on the slider 8f. The end of the slider 8f passes through the guide plate 8e and contacts the bent plate 8a. A avoidance hole for the end of the slider 8f to pass through is provided on the guide plate 8e. One side of the slider 8f contacts the push column 1 6a. When the front blade 2 bends, the push post 1 6a will slide, and the sliding direction of the push post 1 6a is parallel to the length of the rear blade 3, allowing the push post 1 6a to slide along the strip-shaped receiving groove. As the push post 1 6a moves, it pushes the slider 8f to slide outward along the second inclined groove 8e1, causing the push post 2 8c to push the bent plate 8a, which in turn pulls the contact spring 4 outward, thereby simultaneously separating the two contact springs 4 from the front blade 2. The outward movement distance of the push post 2 8c is limited by the slope of the second inclined groove 8e1, and the distance can be set to be small to avoid excessive outward pulling of the contact spring 4. Furthermore, the contact spring 4 can be adaptively pushed outward at the moment the front blade 2 and rear blade 3 bend.

[0032] like Figure 7 As shown, the elastic inward pushing mechanism 8b includes a guide seat 1 8b1, a slide 8b2, a guide post 1 8b3, a spring 1 8b4, and a limiting circular plate 8b5. The slide 8b2 is slidably mounted on the guide seat 1 8b1, half of the spring is fixedly mounted on the slide 8b2, and the guide post 1 8b3 is slidably connected to the guide seat 1 8b1. The guide seat 1 8b1 is fixedly provided with a guide plate for guiding the guide post 1 8b3. The spring 1 8b4 is used to provide an elastic force for the contact spring 4 toward the front blade 2. The spring 1 8b4 is mounted on the guide post 1 8b3 and is located between the slide 8b2 and the guide plate. The limiting circular plate 8b5 is fixedly mounted on the end of the guide post 1 8b3. When the contact spring 4 is pulled outward by the bent plate 8a, the slide 8b2 will move outward, driving the half of the contact spring 4 to separate from the front blade 2. When the front blade 2 is inserted into the contact spring 4, the elastic thrust of the spring 1 8b4 ensures that the front blade 2 fits the contact spring 4 even if the contact spring 4 is worn thin.

[0033] like Figure 4 As shown, the elastic straightening mechanism 6 also includes symmetrically arranged elastic seats, each of which includes a displacement plate 6b, a second guide post 6c, a second spring 6d, a third guide seat 6e, and a reinforcement frame 6f. One end of the displacement plate 6b is fixedly connected to the first push post 6a, the second guide post 6c is fixedly connected to the other end of the displacement plate 6b, the third guide seat 6e is fixedly mounted on the side of the rear blade plate 3, and the second guide post 6c is slidably connected to the third guide seat 6e. The second spring 6d is used to apply an elastic force to the displacement plate 6b away from the third guide seat 6e. The second spring 6d is sleeved on the second guide post 6c, with one end of the second spring 6d contacting the displacement plate 6b and the other end contacting the third guide seat 6e. The reinforcement frame 6f is connected to the side of the displacement plate 6b and the tail of the second guide post 6c. When the front blade 2 and the rear blade 3 bend and push the first push post 6a to move horizontally, the first push post 6a will drive the displacement plate 6b to move horizontally, which causes the second spring 6d to be compressed. When the front blade 2 and the contact spring 4 separate, the spring 2 6d propels the push pin 1 6a forward, resetting the front blade 2 and rear blade 3 to a parallel position. The reinforcement frame 6f strengthens the displacement plate 6b and the guide pin 2 6c. A guide hole for the push pin 2 8c is provided on the outer edge of the displacement plate 6b. This guide hole allows the push pin 2 8c to pass through the displacement plate 6b and contact the bent plate 8a.

[0034] like Figure 8As shown, the rotation drive mechanism 5 includes an isolation rotation shaft 5a, an isolation pull rod 5b, and a main crank arm 5c. The isolation rotation shaft 5a is rotatably connected to the mounting frame 7. One end of the main crank arm 5c is fixedly mounted on the isolation rotation shaft 5a. The other end of the main crank arm 5c is hinged to the bottom of the isolation pull rod 5b. The top of the isolation pull rod 5b is hinged to the rear blade 3. By rotating the isolation rotation shaft 5a, the isolation rotation shaft 5a can drive the isolation pull rod 5b to rotate through the main crank arm 5c, so that the rear blade 3 can rotate and swing.

[0035] like Figure 9 As shown, a reset mechanism 9 is fixedly mounted on the mounting frame 7. This reset mechanism 9 is used to provide rotational thrust to the isolation rotating shaft 5a. The reset mechanism 9 includes a secondary crank arm 9a and a telescopic rod 9b. One end of the secondary crank arm 9a is fixedly mounted on the isolation rotating shaft 5a, and the other end of the secondary crank arm 9a is rotatably connected to the telescopic rod 9b. One end of the telescopic rod 9b is hinged to the mounting frame 7. When the front blade 2 and rear blade 3 are in the closed state, the thrust provided by the telescopic rod 9b pushes the front blade 2 against the contact spring 4. When the switch is opened, the front blade 2 rotates upward. When the maximum compression position of the telescopic rod 9b is exceeded, the telescopic rod 9b will in turn apply an upward thrust to the front blade 2 through the isolation rotating shaft 5a.

[0036] During use, when the front blade 2 rotates upward and separates from the contact spring 4, the rotary drive mechanism 5 will push the rear blade 3 to rotate upward. If the friction between the front blade 2 and the contact spring 4 is large, the spring 6d will be compressed, causing the front blade 2 and the rear blade 3 to bend. During the bending process, the slider 8f will slide obliquely through the second inclined groove 8e1 of 8b, causing the push column 8c to push the bent plate 8a to the sides. This will separate the two half-edge springs to the sides, making it easier to lift the front blade 2 and avoiding the removal of a lot of rust. After the front blade 2 and the contact spring 4 are completely separated, the elastic straightening mechanism 6 will push the front blade 2 parallel to the rear blade 3.

[0037] When the front blade 2 is clamped on the two contact springs 4, the two contact springs 4 can be pushed inward by the outward pushing mechanism 8, so that the two contact springs 4 clamp the front blade 2, solving the problem of loss of elasticity of the contact springs due to long-term use.

[0038] When the front blade 2 and the rear blade 3 are bent due to the rust block, the front blade 2 rotates, and the front blade 2 and the contact spring 4 form a rotary cutting method, which breaks the rust block point by point, reducing the resistance encountered when the isolation blade is lifted. In addition, this rotary cutting method can generate pulling friction, avoiding lifting the entire rust block and preventing a large gap from forming between the isolation blade and the rust block.

[0039] When the front blade 2 and the rear blade 3 bend, the outward pushing mechanism 8 adaptively pushes the contact spring 4 outward, generating tension between the two contact springs 4 and the front blade 2. The displacement of the contact spring 4 is small, preventing the rust blocks from being torn. In this way, during the sawing process, the front blade 2 and the contact spring 4 are also subjected to tension from two sides, making it easier to separate the front blade 2 and the contact spring 4.

[0040] The outward push mechanism 8 is not electrically controlled, and its overall structure is small and compact. It can adaptively push the contact spring 4 outward at the moment the front blade 2 and rear blade 3 bend. Furthermore, the outward movement distance of the second push post 8c is limited by the slope of the second inclined slot 8e1, allowing the distance to be set relatively small to avoid excessive outward movement of the contact spring 4.

[0041] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A burn-proof primary and secondary fusion sleeve column circuit breaker, characterized in that: The invention comprises a circuit breaker body (1), three isolating blades, three contact springs (4), a rotary drive mechanism (5) and a mounting frame (7), wherein the mounting frame (7) is fixedly connected to the circuit breaker body (1), three conductive rods (1a) are provided on the circuit breaker body (1), and the three contact springs (4) are fixedly mounted on the mounting frame (7), and the three isolating blades are used to connect the three conductive rods (1a) with the contact springs (4), respectively, and each isolating blade comprises a front blade plate (2), a rear blade plate (3 ) and an elastic straightening mechanism (6), one end of the rear blade plate (3) is hinged to the conductive rod (1a), the other end of the rear blade plate (3) is hinged to the front blade plate (2), the elastic straightening mechanism (6) is fixedly mounted on the rear blade plate (3), an inclined groove (2a) is provided on the front blade plate (2), and a push column (6a) capable of horizontal pushing is provided on the elastic straightening mechanism (6), when the push column (6a) contacts the bottom of the inclined groove (2a), the top of the rear blade plate (3) is parallel to the top of the front blade plate (2); Outward pushing mechanisms (8) are symmetrically fixedly provided on both sides of the rear blade (3); the contact spring (4) is divided into two half springs, each half spring corresponds to an outward pushing mechanism (8), and the outward pushing mechanism (8) is used to push the two contact springs (4) to move outward; Each outward pushing mechanism (8) includes a bent plate (8a), an elastic inward pushing mechanism (8b), a second pushing column (8c), a guide plate (8e) and a slider (8f); the contact spring (4) is fixedly mounted on the elastic seat of the elastic inward pushing mechanism (8b); one end of the bent plate (8a) is fixedly connected to the contact spring (4); the guide plate (8e) is fixedly mounted on the rear blade (3); the front blade (2) is rotatably connected to the guide plate (8e); a strip-shaped receiving groove is provided on the guide plate (8e); and the width of the slider (8f) is smaller than the strip-shaped groove. The width of the receiving groove is defined, the slider (8f) is located in the strip receiving groove, two inclined grooves (8e1) are provided on the guide plate (8e), two sliding posts (8h) inserted into the inclined grooves (8e1) are fixedly provided on the slider (8f), and the push post (8c) is fixedly mounted on the slider (8f), the end of the slider (8f) passes through the guide plate (8e) and contacts the bent plate (8a), and an avoidance hole for the end of the slider (8f) to pass through is provided on the guide plate (8e), and one side of the slider (8f) contacts the push post (6a).

2. The burn-proof primary and secondary fusion sleeve column circuit breaker according to claim 1, characterized in that: The elastic inward pushing mechanism (8b) comprises a guide seat (8b1), a slide seat (8b2), a guide post (8b3), a spring (8b4) and a limiting circular plate (8b5); the slide seat (8b2) can be slidably mounted on the guide seat (8b1); a half spring piece is fixedly mounted on the slide seat (8b2); the guide post (8b3) is slidably connected to the guide seat (8b1); a guide plate for guiding the guide post (8b3) is fixedly provided on the guide seat (8b1); the spring (8b4) is used to provide an elastic force for the contact spring piece (4) toward the front blade (2); and the limiting circular plate (8b5) is fixedly mounted on the end of the guide post (8b3).

3. The burn-proof primary and secondary fusion sleeve column circuit breaker according to claim 1, characterized in that: The elastic straightening mechanism (6) also includes elastic seats that are symmetrically arranged, each elastic seat including a displacement plate (6b), a guide column 2 (6c), a spring 2 (6d), a guide seat 3 (6e) and a reinforcing frame (6f), one end of the displacement plate (6b) is fixedly connected to the push column 1 (6a), the guide column 2 (6c) is fixedly connected to the other end of the displacement plate (6b), the guide seat 3 (6e) is fixedly installed on the side of the rear blade plate (3), the guide column 2 (6c) is slidably connected to the guide seat 3 (6e), the spring 2 (6d) is used to apply an elastic force to the displacement plate (6b) away from the guide seat 3 (6e), the reinforcing frame (6f) is connected to the side of the displacement plate (6b) and the tail of the guide column 2 (6c), and a guide hole for the push column 2 (8c) to pass through is provided on the outer edge of the displacement plate (6b).

4. The burn-proof primary and secondary fusion sleeve column circuit breaker according to claim 1, characterized in that: The rotary drive mechanism (5) comprises an isolation rotating shaft (5a), an isolation pull rod (5b) and a main crank arm (5c), wherein the isolation rotating shaft (5a) is rotationally connected to the mounting frame (7), one end of the main crank arm (5c) is fixedly mounted on the isolation rotating shaft (5a), the other end of the main crank arm (5c) is hinged to the bottom of the isolation pull rod (5b), and the top of the isolation pull rod (5b) is hinged to the rear blade (3).

5. The burn-proof primary and secondary fusion sleeve column circuit breaker according to claim 4, characterized in that: A reset mechanism (9) is fixedly provided on the mounting frame (7), and the reset mechanism (9) is used to provide a rotational thrust to the isolated rotating shaft (5a). The reset mechanism (9) includes a secondary crank arm (9a) and a telescopic rod (9b). One end of the secondary crank arm (9a) is fixedly mounted on the isolated rotating shaft (5a), and the other end of the secondary crank arm (9a) is rotatably connected to the telescopic rod (9b). One end of the telescopic rod (9b) is hinged to the mounting frame (7).

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