Energy storage type molded case circuit breaker electric operating mechanism

Abstract

The application discloses a kind of energy storage type moulded case circuit breaker electric operating mechanism, including base, operating mechanism, electric drive mechanism, auxiliary switch, wiring terminal, counter, indicator board, and with handle together for encapsulation on shell form a square electric operating mechanism module, simultaneously with manual operation function, outer appearance is simple, can be directly installed on different shell frame moulded case circuit breaker, wide applicability.The operating mechanism of the application realizes mechanism closing and opening process by the same group of energy storage spring, small volume and simple structure;During mechanism closing or opening process, energy storage spring is stored energy before releasing energy, and the fast closing and opening process of circuit breaker is realized by energy storage spring releasing energy, which can be directly used for live electric opening, avoiding the defect that ordinary electric operation is slow and cannot be directly used for live electric opening of moulded case circuit breaker.

Description

Technical Field

[0001] This invention relates to the field of low-voltage electrical technology, specifically to an electric operating mechanism for an energy storage molded case circuit breaker. Background Technology

[0002] Molded case circuit breakers (MCCBs), typically rated at less than 1000A, are widely used in various power systems. They can connect, carry, and disconnect current under normal circuit conditions, and also provide protection by promptly disconnecting the circuit in case of overload, short circuit, or other faults. The electric operating mechanism of an MCCB is fundamental to remote control of the circuit breaker. With technological advancements and rising living standards, the demand for intelligent control of power systems is increasing, making remote control of circuit breakers increasingly important, and thus, the electric operating mechanism of the MCCB is crucial.

[0003] The existing electric operating mechanism of molded case circuit breakers mainly uses a motor to drive a crank-slider mechanism to push the circuit breaker handle to achieve closing and opening. Because the motor rotates at a constant speed and the slider moves slowly, the circuit breaker handle moves smoothly during both closing and opening. Since the molded case circuit breaker is a current-limiting circuit breaker, it uses a four-bar linkage energy storage mechanism to drive the contacts to achieve closing and opening. Therefore, when the circuit breaker is electrically energized for opening, as the handle moves slowly, near the intermediate critical position, the contact pressure gradually decreases to zero. At this point, the contacts will be repelled and arced under the action of electrodynamic force and Holm force, resulting in severe contact erosion and seriously affecting the electrical life of the circuit breaker.

[0004] The current common solution is that the electric operating mechanism of the molded case circuit breaker is only responsible for closing when energized and opening and closing when not energized. Opening when energized is achieved by the shunt trip unit driving the circuit breaker to trip freely. Summary of the Invention

[0005] To address the aforementioned shortcomings in the prior art, this invention provides an electric operating mechanism for an energy storage molded case circuit breaker.

[0006] The technical solution adopted by this invention to solve its technical problem is as follows: an electric operating mechanism for an energy storage molded case circuit breaker, comprising a base and an operating mechanism, an electric drive mechanism, an auxiliary switch, and terminals mounted on the base, and a housing encapsulated around the base to form a square module; the base includes a bottom base and a connecting rod base, a lower rocker base, an upper rocker base, a lower cam base, and an upper cam base respectively fixedly mounted on the bottom base by screws; the bottom base consists of a bracket and a first slide rod and a second slide rod mounted on the bracket; the operating mechanism includes a rocker, an energy storage spring, a connecting rod, and a slider; the rocker is hinged between the lower rocker base and the upper rocker base and can rotate around the hinge; the connecting rod is hinged to a connecting rod base and can rotate around the connecting rod base; one end of the energy storage spring is mounted on the connecting rod via a spring shaft, and the other end is mounted on the rocker. The slider is mounted on the first and second slide rods and can move linearly along them. One end of the connecting rod is hinged to the slider to form a crank-slider structure. When the rocker arm rotates counterclockwise or clockwise, the slider moves up and down linearly to the baseline position via the connecting rod. The slider is used to operate the handle of the molded case circuit breaker to achieve closing or opening. The electric transmission mechanism includes a cam, an operating rod, and a motor assembly. The operating rod is rotatably mounted on the mounting holes of the lower and upper cam bases arranged in parallel vertically via bearings. The cam between the lower and upper cam bases is fixed to the operating rod by a key. The motor assembly, fixed to the upper base of the rocker arm by screws, drives the cam to rotate via gear transmission. The cam can also be rotated by rotating the operating rod. The outer casing is provided with handles connected to the slider for manually operating the closing and opening actions of the mechanism. An indicator plate is also provided to indicate the status of the circuit breaker.

[0007] The electric operating mechanism of the energy storage molded case circuit breaker includes an auxiliary switch mounted on its base. The auxiliary switch includes a first auxiliary switch and a second auxiliary switch fixedly mounted on the cam base by screws. Both the first and second auxiliary switches consist of normally open / normally closed micro switches and contact arms with rollers. The micro switches are connected to the power line of the motor assembly, and the contact arm rollers are in contact with the outer edge surface of the cam.

[0008] The electric operating mechanism for an energy storage molded case circuit breaker includes a cam with several adjustment holes for adjusting the center of gravity. Gear wires and cam wires are respectively arranged on both sides of the outer edge of the cam. The contact arm roller of the first auxiliary switch abuts against the cam wire, and the contact arm roller of the second auxiliary switch abuts against the clearance surface between the gear wire and the cam wire. By utilizing the contact / non-contact interaction between the cam wire and the contact arm roller during cam rotation, the state of the microswitch is changed, thereby controlling the start and stop of the motor assembly, thus enabling the electric control operating mechanism to achieve closing and opening of the circuit breaker.

[0009] The electric operating mechanism of the energy storage type molded case circuit breaker has a slider composed of an upper slider and a lower slider. The connecting rod is composed of a transmission rod and a first roller and a second roller mounted on the transmission rod by a roller pin fixed by an interference fit. The first roller and the second roller are simultaneously installed in a U-shaped groove formed by the upper slider and the lower slider, so that the connecting rod and the slider form a crank-slider structure.

[0010] The electric operating mechanism of the energy storage molded case circuit breaker includes a rocker arm comprising a rod and a block fixedly mounted on the rod by screws. The operating lever includes a rocker shaft inserted into the block of the rocker arm and a cam shaft connected to the rocker shaft by a crossbar. By rotating the cam, the operating lever is driven to move, thereby driving the rocker arm to move, thus realizing the closing or opening action.

[0011] The electric operating mechanism of the energy storage type molded case circuit breaker includes a motor assembly comprising a motor, a gearbox, and an output gear. The motor drives the output gear to mesh with the gear line of the cam through the gearbox.

[0012] The electric operating mechanism of the energy storage type molded case circuit breaker has a counter fixed on the base of the rocker arm, and the sliding block moves back and forth to drive the counter to realize the counting function.

[0013] The beneficial effects of this invention are as follows: The operating mechanism of this invention realizes the closing and opening processes of the mechanism through the same energy storage spring. During the closing or opening process, the energy storage spring first stores energy and then releases energy, and the release of energy by the energy storage spring realizes the rapid opening and closing process of the circuit breaker, making the electric opening of the circuit breaker similar to the free trip opening process. On this basis, it can also be directly used for live electric opening, avoiding the defect that ordinary electric operation is slow and cannot be directly used for live opening of molded case circuit breakers. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the modular shape of the present invention; Figure 2 This is an internal isometric view of the present invention; Figure 3 This is a schematic diagram of the base of the present invention; Figure 4 This is a schematic diagram of the operating mechanism of the present invention; Figure 5 This is a schematic diagram of the electric drive mechanism of the present invention; Figure 6 This is a schematic diagram of the operating lever of the present invention; Figure 7 This is a schematic diagram of the slider structure of the present invention; Figure 8 This is a schematic diagram of the crank-slider connection point of the present invention; Figure 9This is a schematic diagram of the operating mechanism of the present invention in the closed state; Figure 10 This is a schematic diagram of the critical state of the operating mechanism of the present invention; Figure 11 This is a schematic diagram of the tripped state of the operating mechanism of the present invention; Figure 12 This is a schematic diagram of the auxiliary switch switching process of the present invention; Figure 13 This is a schematic diagram of the cam of the present invention; Figure 14 This is a schematic diagram of the counter operation of the present invention; Figure 15 This is a schematic diagram of the hinge connection of the present invention.

[0015] The reference numerals in the attached figures are as follows: 1—base, 11—bottom base, 111—first slide rod, 112—second slide rod, 113—bracket, 12—connecting rod base, 13—lower rocker arm base, 14—upper rocker arm base, 15—lower cam base, 16—upper cam base, 2—operating mechanism, 21—rocker arm, 211—rod, 212—block, 22—energy storage spring, 23—connecting rod, 231—transmission rod, 232—first roller, 233—roller pin, 234—second roller, 24—spring shaft, 25—slider, 2 51—Upper slider, 252—Lower slider, 3—Electric transmission mechanism, 31—Cam, 311—Gear line, 312—Adjusting hole, 313—Cam line, 32—Key, 33—Operating lever, 331—Camshaft, 332—Crossbar, 333—Rockshaft, 34—Motor assembly, 341—Motor, 342—Reduction gearbox, 343—Output gear, 4—Auxiliary switch, 41—First auxiliary switch, 42—Second auxiliary switch, 5—Terminal, 6—Counter, 7—Indicator plate, 8—Handle, 9—Housing. Implementation

[0016] To further understand the content of this invention, a detailed description of the invention will be provided in conjunction with the accompanying drawings and embodiments.

[0017] The purpose of this invention is to overcome the problems existing in the electric operating mechanism of circuit breakers: slow circuit breaker opening process during electric operation with the main circuit energized, easy arcing of the contact system, severe burning of contact pieces, and low electrical life of the circuit breaker. This invention provides an energy storage type electric operating mechanism for molded case circuit breakers.

[0018] This invention achieves the closing and opening processes of the mechanism using the same set of energy storage springs. During the closing or opening process, the energy storage springs first store energy and then release it. The release of energy by the energy storage springs realizes the rapid opening and closing process of the circuit breaker, making the electric opening process of the circuit breaker the same as the free trip opening process. It can be directly used for live electric opening, avoiding the defects of ordinary electric operation which is slow and cannot be directly used for live opening of molded case circuit breakers. Furthermore, the electric operation mechanism of this molded case circuit breaker is small in size and simple in structure, making it suitable for modular design and widely adaptable.

[0019] This invention provides an electric operating mechanism for an energy storage molded case circuit breaker, mainly composed of a base 1, an operating mechanism 2, an electric drive mechanism 3, an auxiliary switch 4, a terminal block 5, a counter 6, an indicator plate 7, a handle 8, and a housing 9. The operating mechanism 2 and the electric drive mechanism 3 are mounted on the base 1, forming the main body of the circuit breaker's electric operating mechanism, enabling both electric and manual operation of the circuit breaker's closing and opening actions. The indicator plate 7 is mounted on the mechanism to indicate the circuit breaker's status. The base 1 also houses the auxiliary switch 4, terminal block 5, counter 6, and housing 9. The handle 8 is mounted on the housing 9 for manually operating the closing and opening actions of the mechanism. Figure 1 and Figure 2 As shown.

[0020] Reference Figure 3 The base 1 includes a bottom base 11, a connecting rod base 12, a lower rocker arm base 13, an upper rocker arm base 14, a lower cam base 15, and an upper cam base 16. The connecting rod base 12, the lower rocker arm base 13, the upper rocker arm base 14, the lower cam base 15, and the upper cam base 16 are all fixedly mounted on the bottom base 11 with screws, forming the base 1 of the entire electric operating mechanism for mounting different components. The bottom base 11 includes a first slide rod 111, a second slide rod 112, and a bracket 113. The first slide rod 111 and the second slide rod 112 are mounted on the bracket 113 for mounting the slider 25.

[0021] Reference Figure 4 The operating mechanism 2 consists of a rocker arm 21, an energy storage spring 22, a connecting rod 23, a spring shaft 24, and a slider 25. The rocker arm 21 is hinged between the lower rocker arm base 13 and the upper rocker arm base 14 and can rotate around the hinge. The connecting rod 23 is hinged to the connecting rod base 12 and can rotate around the connecting rod base 12. One end of the energy storage spring 22 is mounted on the connecting rod 23 via the spring shaft 24, and the other end is mounted on the rocker arm 21. The slider 25 is mounted on the first slide rod 111 and the second slide rod 112 and can move linearly along the first slide rod 111 and the second slide rod 112. One end of the connecting rod 23 is hinged to the slider to form a crank-slider structure. When the connecting rod 23 rotates, it drives the slider 25 to move linearly. The slider 25 is used to operate the molded case circuit breaker handle to achieve closing or opening.

[0022] When the manual operating mechanism performs closing and opening actions, during the energy storage process, the lever 33 is rotated via handle 8, causing the rocker arm 21 to move slowly. The energy storage spring 22 begins to store energy. When the mechanism passes the critical state and enters the energy release process, the energy storage spring 22 releases energy to achieve rapid movement of the connecting rod 23 and the slider 25, completing the closing or opening action. When the electric operating mechanism is used, the motor assembly 34 drives the cam 31 to rotate, thereby driving the mechanism to move. During the energy storage process, the auxiliary switch 4 remains in a constant state. When the mechanism is in a critical state, the state of the auxiliary switch 4 is about to change. When the mechanism just enters the energy release state, the auxiliary switch 4 immediately changes, the motor assembly 34 stops moving, and the energy storage spring 22 releases energy to achieve rapid movement of the connecting rod 23 and the slider 25.

[0023] The electric operating mechanism of the present invention is an energy storage type operating mechanism. The same set of energy storage springs is used in the opening and closing processes. During the closing or opening process of the electric operating mechanism, the energy storage springs first store energy and then release energy, so that the operating mechanism's operating characteristics for opening the circuit breaker are the same as its free trip opening characteristics.

[0024] Reference Figure 5 The electric transmission mechanism 3 includes a cam 31, an operating lever 33, and a motor assembly 34. The operating lever 33 is connected to the mounting holes of the lower cam base 15 and the upper cam base 16 arranged in parallel by bearings and can rotate. The cam 31 is fixedly mounted on the operating lever 33 by a key 32 and is located between the lower cam base 15 and the upper cam base 16. The motor assembly 34 is fixedly mounted on the rocker arm base 14 by screws. The motor assembly 34 drives the cam 31 to rotate through gear transmission, or it can drive the cam 31 to rotate by rotating the operating lever 33.

[0025] The motor assembly 34 includes a motor 341, a reduction gearbox 342, and an output gear 343. The motor 341 is reduced in speed by the reduction gearbox 342 and then meshes with the gear line 311 of the cam 31, which can drive the cam 31 to rotate through gear transmission.

[0026] The rocker arm 21 includes a rod 211 and a block 212, with the block 212 fixedly mounted on the rod 211 by screws.

[0027] Reference Figure 5 and Figure 6 The operating lever 33 includes a camshaft 331, a crossbar 332, and a rocker shaft 333. The rocker shaft 333 is inserted into the block 212 in the rocker 21. By rotating the cam 31, the operating lever 33 is driven to move, which in turn drives the rocker 21 to move, thereby realizing the closing or opening action.

[0028] Reference Figure 4 and Figure 15 The hinge connection between the connecting rod 23 and the connecting rod base 12, as well as the hinge connection between the rocker arm 21 and the lower rocker arm base 13 and the upper rocker arm base 14, are all achieved through the tension of the energy storage spring 22 and the concentric arc surface between the two parts. Axial positioning is achieved through the direct sheet metal bending of the connecting rod base 12, the lower rocker arm base 13 and the upper rocker arm base 14. It is a direct arc contact, without a connecting shaft, with a simple and reliable structure, compact size, and is very conducive to miniaturization.

[0029] Reference Figure 7 and Figure 8 The slider 25 consists of an upper slider 251 and a lower slider 252, and the connecting rod 23 consists of a transmission rod 231, a first roller 232, and a second roller 234. The first roller 232 and the second roller 234 are mounted on a roller pin 233, which is fixedly mounted on the transmission rod 231 via an interference fit. The first roller 232 and the second roller 234 are simultaneously installed in a U-shaped groove formed by the upper slider 251 and the lower slider 252, thus forming a crank-slider structure with the connecting rod 23 and the slider 25. When the transmission rod 231 rotates, the slider 25 moves linearly along the first slide rod 111 and the second slide rod 112 under the action of the first roller 232 and the second roller 234.

[0030] The outer casing 9 is provided with handles 8 that connect to sliders 25 for manually operating the closing and opening actions of the mechanism, and is also provided with an indicator plate 7 for indicating the status of the circuit breaker.

[0031] Reference Figure 12 The auxiliary switch 4 includes a first auxiliary switch 41 and a second auxiliary switch 42, both of which are fixedly mounted on the base 16 of the cam by screws and arranged on both sides of the operating lever 33. The first auxiliary switch 41 and the second auxiliary switch 42 are both composed of normally open / normally closed micro switches and contact arms with rollers. The micro switches are connected to the power line of the motor assembly 34, and the contact arm rollers are in contact with the outer edge surface of the cam 31.

[0032] Reference Figure 13 The cam 31 includes a gear line 311, an adjustment hole 312, and a cam line 313. The adjustment hole 312 is used to adjust the center of gravity of the cam 31 so that the center of gravity of the cam 31 is on the axis, thus ensuring the stability of the cam rotation.

[0033] The contact arm roller of the first auxiliary switch 41 abuts against the cam line 313, and the contact arm roller of the second auxiliary switch 42 abuts against the clearance surface between the gear line 311 and the cam line 313. By using the contact / non-contact between the cam line 313 and the contact arm roller when the cam 31 rotates, the state of the micro switch is changed, thereby controlling the start and stop of the motor assembly 34, so as to realize the electric control operating mechanism to achieve closing and opening.

[0034] When the electric operating mechanism is activated, the motor assembly 34 drives the cam 31 to rotate, which in turn drives the mechanism to move. During the energy storage process, the state of the auxiliary switch 4 remains unchanged. When the mechanism is in a critical state, the state of the auxiliary switch 4 is about to change. When the mechanism just enters the energy release state, the auxiliary switch 4 immediately changes, the motor assembly 34 stops moving, and the energy is released through the energy storage spring 22 to realize the rapid movement of the connecting rod 23 and the slider 25.

[0035] Reference Figure 14 A counter 6 is fixed on the base 14 of the rocker arm. The counting function of the operating mechanism is realized by fixing the counter 6. When the mechanism performs the closing-opening cycle, the slider 25 moves back and forth to drive the counter to realize the counting function. The operating mechanism of the present invention can be made into a square electric operating mechanism module, which has a simple appearance, small size, and simple structure. It can be directly installed on molded case circuit breakers of different frames and has wide applicability.

[0036] Working principle of the mechanism of this invention: Refer to Figures 9-11 The rocker arm 21 moves counterclockwise to its limit position under the action of the energy storage spring 22 and contacts the upper limit position of the base 1. At this time, the connecting rod 23 drives the slider 25 to move upward to the baseline position, which is the closed position; or it moves clockwise to its limit position and contacts the lower limit position of the base 1. At this time, the connecting rod 23 drives the slider 25 to move downward to the baseline position, which is the open position.

[0037] As the rocker arm 21 moves clockwise from the closed position to the open position, it drives the energy storage spring 22 to rotate clockwise around the spring shaft 4. Before the energy storage spring 22 coincides with the connecting rod 23, the connecting rod 23 is subjected to a clockwise rotation torque under the tension of the energy storage spring 22, thus reaching its extreme clockwise position and remaining stationary. The energy storage spring 22 gradually lengthens, which is the energy storage process. When the energy storage spring 22 coincides with the connecting rod 23, the connecting rod 23 is at its extreme clockwise position, and the energy storage spring 22 is stretched. When the rocker arm 21 reaches its maximum position, energy storage ends and the device is at a critical position. As the rocker arm 21 continues to rotate clockwise, the energy storage spring 22 also continues to rotate clockwise. The tension on the connecting rod 23 causes the clockwise torque on the connecting rod 23 to suddenly become a counterclockwise torque. Under the action of the energy storage spring 22, the connecting rod 23 rotates counterclockwise to its limit position. The energy storage spring 22 then returns from its maximum position to its original state, which is the energy release process. During the energy release process, the rocker arm 21 drives the slider 25 to move rapidly to the opening position, completing the opening.

[0038] During the counterclockwise rotation of the rocker arm 21 from the open position to the closed position, the rocker arm 21 drives the energy storage spring 22 to rotate counterclockwise around the spring shaft 4. Before the energy storage spring 22 coincides with the connecting rod 23, the connecting rod 23 is subjected to a counterclockwise rotation torque under the tension of the energy storage spring 22, thus reaching the extreme position of counterclockwise movement and remaining stationary. The energy storage spring 22 gradually lengthens, i.e., the energy storage process. When the energy storage spring 22 coincides with the connecting rod 23, the connecting rod 23 is at the extreme position of counterclockwise movement, and the energy storage spring 22 is stretched. When the rocker arm 21 reaches its maximum position, energy storage ends and the device is at a critical position. When the rocker arm 21 continues to rotate counterclockwise, the energy storage spring 22 also continues to rotate counterclockwise. The tension on the connecting rod 23 causes the counterclockwise torque on the connecting rod 23 to suddenly become a clockwise torque. Under the action of the energy storage spring 22, the connecting rod 23 rotates clockwise to its limit position. The energy storage spring 22 then returns from its maximum position to its original state, which is the energy release process. During the energy release process, the rocker arm 21 drives the slider 25 to move quickly to the closing position, completing the closing process.

[0039] The above embodiments are merely illustrative of the principles and effects of the present invention, as well as some of the application examples. For those skilled in the art, various modifications and improvements can be made without departing from the inventive concept of the present invention, and these all fall within the protection scope of the present invention.

Claims

1. An electric operating mechanism for an energy storage type molded case circuit breaker, characterized in that: It includes a base (1) and an operating mechanism (2), an electric drive mechanism (3) and a terminal block (5) mounted on the base (1), and also includes a housing (9) encapsulated outside the base (1); The base (1) includes a bottom base (11) and a connecting rod base (12), a rocker lower base (13), a rocker upper base (14), a cam lower base (15) and a cam upper base (16) respectively installed on the bottom base (11). The bottom base (11) is composed of a bracket (113) and a first slide rod (111) and a second slide rod (112) installed on the bracket (113). The operating mechanism (2) includes a rocker arm (21), an energy storage spring (22), a connecting rod (23), and a slider (25). The rocker arm (21) is movably connected between the lower rocker arm base (13) and the upper rocker arm base (14). The connecting rod (23) is movably connected to the connecting rod base (12). One end of the energy storage spring (22) is mounted on the connecting rod (23) through the spring shaft (24), and the other end is mounted on the rocker arm (21). The slider (25) is mounted on the first sliding rod (111) and the second sliding rod (112). One end of the connecting rod (23) is movably connected to the slider (25) to form a crank-slider structure. When the rocker arm (21) rotates counterclockwise or clockwise, the connecting rod (23) drives the slider (25) to move up and down to achieve closing or opening the circuit breaker. The electric drive mechanism (3) includes a cam (31), an operating lever (33), and a motor assembly (34). The operating lever (33) is rotatably mounted on the lower cam base (15) and the upper cam base (16). The cam (31) between the lower cam base (15) and the upper cam base (16) is fixedly mounted on the operating lever (33) by a key (32). The motor assembly (34) mounted on the rocker upper base (14) drives the cam (31) to rotate through gear transmission. The outer casing (9) is provided with a handle (8) for connecting the slider (25) and an indicator plate (7) for indicating the status of the circuit breaker.

2. The electric operating mechanism for an energy storage type molded case circuit breaker according to claim 1, characterized in that, An auxiliary switch (4) is also installed on the base (1). The auxiliary switch (4) includes a first auxiliary switch (41) and a second auxiliary switch (42) installed on the cam base (16). The first auxiliary switch (41) and the second auxiliary switch (42) are both composed of a micro switch and a contact arm. The micro switch is connected to the power line of the motor assembly (34), and the contact arm is in contact with the outer edge of the cam (31).

3. The electric operating mechanism for an energy storage type molded case circuit breaker according to claim 2, characterized in that, The cam (31) is provided with several adjustment holes (312) for adjusting the center of gravity. Gear lines (311) and cam lines (313) are respectively provided on both sides of the outer edge of the cam (31). The contact arm of the first auxiliary switch (41) abuts against the cam line (313), and the contact arm of the second auxiliary switch (42) abuts against the clearance surface between the gear line (311) and the cam line (313).

4. The electric operating mechanism for an energy storage molded case circuit breaker according to claim 1, 2, or 3, characterized in that, The slider (25) consists of an upper slider (251) and a lower slider (252). The connecting rod (23) consists of a transmission rod (231) and a first roller (232) and a second roller (234) mounted on the transmission rod (231) via a roller pin (233). The first roller (232) and the second roller (234) are located in the U-shaped groove formed by the upper slider (251) and the lower slider (252), thereby forming a crank-slider structure.

5. The electric operating mechanism for an energy storage molded case circuit breaker according to claim 4, characterized in that, The rocker (21) includes a rod (211) and a block (212) fixedly mounted on the rod (211) by screws. The operating lever (33) includes a rocker shaft (333) inserted into the block (212) and a camshaft (331) connected to the rocker shaft (333) by a crossbar (332).

6. The electric operating mechanism for an energy storage molded case circuit breaker according to claim 5, characterized in that, The motor assembly (34) includes a motor (341), a gearbox (342) and an output gear (343). The motor (341) drives the output gear (343) to mesh with the gear line (311) of the cam (31) through the gearbox (342) to reduce speed.

7. The electric operating mechanism for an energy storage molded case circuit breaker according to claim 6, characterized in that, A counter (6) is fixed on the base (14) of the rocker arm.

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