Connecting structure of moving contact of circuit breaker

Abstract

The utility model relates to the technical field of low-voltage electric appliance components, in particular to a connecting structure of a moving contact of a circuit breaker. Comprising a mechanism main shaft, a connecting rod, a contact support, a fixed shaft, a pin shaft and an insertion sheet, one end of the connecting rod is fixed on the contact support through a fixing shaft, and the other end of the connecting rod is fixed on the mechanism main shaft through a pin shaft; according to the structure that the inserting piece is clamped on the contact support and limits the fixing shaft, in the using process of the circuit breaker, when the connecting rod is abraded to influence the pressure of the contact and overtravel needs to be replaced, the moving contact assembly does not need to be disassembled, only the inserting piece on the contact support needs to be disassembled, and the fixing shaft needs to be pulled out, so that the connecting rod can be easily disassembled; after replacement is completed, the fixed shaft is inserted, and the insertion sheet is clamped again to complete replacement of the connecting rod, thereby increasing the width of the connecting rod, enabling the connecting rod and the fixed shaft to be stressed more uniformly, enabling the connecting rod to be not liable to wear, enabling the connection to be firmer, reducing the installation and connection difficulty of the moving contact, and facilitating the maintenance, repair and adjustment of the whole structure.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage electrical components, in particular to a connection structure of a moving contact of a circuit breaker. Background Art

[0002] As users' demands for the safety of universal circuit breakers increase, the power transmission safety of circuit breakers is increasingly valued. As the conductive part of the main circuit of the circuit breaker, the reliability of the moving contact will directly affect the safety performance of the entire circuit breaker. However, the connection structure between the operating mechanism and the contact mechanism of the existing universal circuit breaker is relatively simple. The existing limit method is not only complex in structure, but also cumbersome in assembly process. It is easy to produce fatigue after the circuit breaker is opened and closed many times, which leads to the loss of movement power of the moving contact. During the use of the circuit breaker, when the connecting rod is worn and affects the contact pressure and overtravel, it needs to be replaced. Since the traditional moving contact fixes the connecting rod through the left and right clamps, the moving contact assembly needs to be disassembled to complete the replacement of the connecting rod, and the disassembled contact support cannot be reused. Disassembly and assembly are troublesome, time-consuming and labor-intensive. In some frame circuit breakers, the connection point between the moving contact and the mechanism is the connecting rod pin. Due to less contact, the connection is not firm enough. Utility Model Content

[0003] The purpose of the utility model is to provide a connection structure for the moving contact of a circuit breaker in view of the defects existing in the prior art, so that during the use of the circuit breaker, when the connecting rod is worn and affects the contact pressure and overtravel and needs to be replaced, it is no longer necessary to disassemble the moving contact assembly. It is only necessary to remove the plug on the contact support and pull out the fixed shaft to easily complete the disassembly of the connecting rod. After the replacement is completed, the fixed shaft is inserted and the plug is re-engaged to complete the replacement of the connecting rod, thereby increasing the width of the connecting rod, making the connecting rod and the fixed shaft more evenly stressed, and the connecting rod is not easy to wear. At the same time, the connection is more tightened, reducing the difficulty of installing and connecting the moving contact, and facilitating the maintenance, repair and adjustment of the entire structure.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a connection structure of a moving contact of a circuit breaker, comprising a mechanism main shaft, a connecting rod, a contact support, a fixed shaft, a pin shaft, and an insert; one end of the connecting rod is fixed to the contact support through the fixed shaft, and the other end of the connecting rod is fixed to the mechanism main shaft through the pin shaft; the insert shaft is clamped on the contact support and limits the fixed shaft.

[0005] Furthermore, a cantilever is provided on the main shaft of the mechanism, a cantilever through hole is provided on the cantilever, the pin passes through the cantilever through hole to fix the connecting rod on the main shaft of the mechanism, and the connecting rod is rotationally connected to the main shaft of the mechanism.

[0006] Furthermore, the contact support bottom is provided with two arc-shaped grooves, and the connecting rod rotates in the arc-shaped grooves.

[0007] Furthermore, a countersunk hole is provided on a side surface of the contact support, and the fixed shaft is inserted into the countersunk hole to fix the connecting rod on the contact support.

[0008] Furthermore, the bottom of the contact support has a square groove for placing the plug-in piece, and the side of the contact support has two square through holes, which cooperate with the plug-in piece to form a snap connection and limit the fixed shaft.

[0009] Furthermore, a first connecting rod through hole and a second connecting rod through hole are provided on the connecting rod; the first connecting rod through hole cooperates with the fixed shaft so that the connecting rod is rotatably connected to the fixed shaft; the second connecting rod through hole cooperates with the cantilever through hole on the cantilever, and the pin shaft passes through the cantilever through hole and the second connecting rod through hole to fix the connecting rod to the mechanism main shaft, and the connecting rod is rotatably connected to the cantilever.

[0010] Furthermore, a boss is provided on the left side of the pin shaft, and a pin shaft through hole is provided on the right side of the pin shaft.

[0011] Furthermore, the insert is a square structure, and the insert matches the square groove.

[0012] Furthermore, two clamping heads are arranged on the inserting piece, and the clamping heads cooperate with the square through holes to form a clamping connection and limit the fixed shaft.

[0013] Furthermore, when the inserting piece is inserted into the square slot, the clamping head may be deformed inward to a certain extent so that the inserting piece can be smoothly inserted into the square slot.

[0014] The invention comprises a mechanism main shaft, a connecting rod, a contact support, a fixed shaft, a pin shaft and an insert; one end of the connecting rod is fixed to the contact support by the fixed shaft, and the other end of the connecting rod is fixed to the mechanism main shaft by the pin shaft; the insert shaft is clamped on the contact support and limits the fixed shaft, so that during the use of the circuit breaker, when the connecting rod is worn and affects the contact pressure and overtravel and needs to be replaced, it is no longer necessary to disassemble the moving contact assembly, and only the insert shaft on the contact support needs to be removed and the fixed shaft needs to be pulled out, so that the connecting rod can be easily disassembled, and after the replacement is completed, the fixed shaft is inserted, and the insert shaft is clamped again to complete the replacement of the connecting rod, thereby increasing the width of the connecting rod, making the connecting rod and the fixed shaft more evenly stressed, and the connecting rod is not easy to wear. At the same time, the connection is more tightened, reducing the difficulty of installing and connecting the moving contact, and facilitating the maintenance, repair and adjustment of the entire structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 This is a schematic diagram of the connection structure of a moving contact of a circuit breaker of the utility model;

[0017] Figure 2 This is a schematic diagram of the main shaft structure of the connecting structure mechanism of the moving contact of a circuit breaker of the utility model;

[0018] Figure 3 This is a schematic diagram of a connecting rod structure of a circuit breaker moving contact of the utility model;

[0019] Figure 4 This is a schematic diagram of a contact support structure of a connection structure of a moving contact of a circuit breaker of the utility model;

[0020] Figure 5 This is a schematic diagram of a fixed shaft structure of a connection structure of a circuit breaker moving contact of the utility model;

[0021] Figure 6 This is a schematic diagram of the pin structure of a connection structure of a moving contact of a circuit breaker of the utility model;

[0022] Figure 7 This is a schematic diagram of the connecting structure of the moving contact of a circuit breaker of the utility model;

[0023] Reference numerals:

[0024] Mechanism main shaft 1, cantilever 1-1, cantilever through hole 1-2, connecting rod 2, first connecting rod through hole 2-1, second connecting rod through hole 2-2, contact support 3, arc groove 3-1, countersunk hole 3-2, square groove 3-3, square through hole 3-4, fixed shaft 4, pin shaft 5, boss 5-1, pin shaft through hole 5-2, insert 6, and clamp 6-1. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0026] In the description of the present invention, it should be noted that the directions or positional relationships indicated by “center”, “up”, “down”, “left”, “right”, “vertical”, “horizontal”, “inside” and “outside”, etc., are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0027] A connection structure for a moving contact of a circuit breaker, such as Figure 1 , 3 As shown, it includes a mechanism main shaft 1, a connecting rod 2, a contact support 3, a fixed shaft 4, a pin shaft 5, and an insert 6; one end of the connecting rod 2 is fixed to the contact support 3 through the fixed shaft 4, and the other end of the connecting rod 2 is fixed to the mechanism main shaft 1 through the pin shaft 5; the insert 6 is clamped on the contact support 3 and limits the fixed shaft 4.

[0028] Specifically, the structure includes a mechanism main shaft 1, a connecting rod 2, a contact support 3, a fixed shaft 4, a pin shaft 5, and an insert 6; one end of the connecting rod 2 is fixed to the contact support 3 through the fixed shaft 4, and the other end of the connecting rod 2 is fixed to the mechanism main shaft 1 through the pin shaft 5; the insert 6 is clamped on the contact support 3 and limits the fixed shaft 4, so that the connection between the basic components with compact structure is direct and simple, thereby simplifying the installation process, and the connecting rod 2 is respectively connected to the contact support 3 and the mechanism main shaft 1 through the fixed shaft 4 and the pin shaft 5, which further facilitates the operation, and the insert 6 makes the fixed shaft 4 The limiting of the fixed axis 4 is more convenient and can be completed without complicated tools or steps. When the connecting rod 2 needs to be replaced due to wear, it is only necessary to remove the plug 6 on the contact support 3 and pull out the fixed axis 4 to easily complete the disassembly of the connecting rod. After the replacement is completed, the new fixed axis 4 is inserted and the plug 6 is re-engaged to complete the replacement of the connecting rod. The whole process is fast and simple. The connecting rod 2 is firmly connected with the contact support 3 and the main axis 1 of the mechanism through the fixed axis 4 and the pin 5, ensuring the stability of the entire structure. The limiting effect of the plug 6 further enhances the firmness of the connection and reduces the safety risk caused by the loosening or falling off of the connecting rod. At the same time, the design of increasing the width of the connecting rod 2 makes the connecting rod and the fixed axis 4 more evenly stressed, reduces the wear problem caused by uneven stress, prolongs the service life of the connecting rod, and reduces the maintenance cost caused by the wear of the connecting rod. Further, through the optimized connection structure, the circuit breaker is more stable and reliable during the opening and closing process, reducing the safety risk caused by improper operation or equipment failure, and improving the electrical performance and service life of the circuit breaker. The connection structure of the moving contact of the circuit breaker is ensured to have the effects of simple structure, easy installation and maintenance, convenient replacement of connecting rods, firm connection, optimized force distribution and improved reliability and stability.

[0029] As a preferred embodiment of the above, Figure 1 As shown, a cantilever 1-1 is provided on the mechanism main shaft 1, a cantilever through hole 1-2 is provided on the cantilever 1-1, the pin 5 passes through the cantilever through hole 1-2 to fix the connecting rod 2 on the mechanism main shaft 1, and the connecting rod 2 is rotationally connected to the mechanism main shaft 1.

[0030] Specifically, the cantilever 1-1 is provided on the mechanism main shaft 1, and the cantilever through hole 1-2 is provided on the cantilever 1-1. The pin shaft 5 passes through the cantilever through hole 1-2 to fix the connecting rod 2 on the mechanism main shaft 1. The structure of the connecting rod 2 and the mechanism main shaft 1 being rotatably connected allows the connecting rod 2 to flexibly rotate on the mechanism main shaft 1, ensuring that the moving contact of the circuit breaker can move according to a predetermined trajectory and angle during the opening and closing process, thereby achieving accurate and reliable action. The connecting rod 2 is connected to the mechanism main shaft 1 by passing the pin shaft 5 through the cantilever through hole 1-2. This connection method is simple and direct, and does not require complicated The installation steps or tools are reduced, which reduces the difficulty and cost of assembly. At the same time, the cooperation between the pin shaft 5 and the cantilever through hole 1-2 ensures that the connection between the connecting rod 2 and the mechanism main shaft 1 is stable and reliable, reducing the safety risks caused by loosening or falling off. When the connecting rod 2 needs to be maintained or replaced, the connecting rod 2 can be easily removed from the mechanism main shaft 1 by removing the pin shaft 5, which is convenient for subsequent maintenance or replacement. Since the connection between the connecting rod 2 and the mechanism main shaft 1 is achieved through the pin shaft 5 and the cantilever through hole 1-2, this connection method reduces direct contact and friction, reduces the degree of wear, and thus extends the service life of the circuit breaker. The cantilever 1-1 and the cantilever through hole 1-2 set on the mechanism main shaft 1 are used in conjunction with the pin shaft 5, which not only realizes the flexible rotation connection between the connecting rod 2 and the mechanism main shaft 1, but also has the effect of simplifying the connection structure, enhancing the connection stability, improving the maintainability and extending the service life.

[0031] As a preferred embodiment of the above, Figure 1 , 2 As shown, two arc grooves 3 - 1 are provided at the bottom of the contact support 3 , and the connecting rod 2 rotates in the arc grooves 3 - 1 .

[0032] Specifically, two arc grooves 3-1 are provided at the bottom of the contact support 3, and the connecting rod 2 is structured to rotate in the arc groove 3-1, so that the arc groove 3-1 allows the connecting rod 2 to rotate freely therein, ensuring that the moving contact can move according to a predetermined trajectory and angle during the opening and closing process, thereby achieving accurate and reliable action. By providing the arc groove 3-1 on the contact support 3, the contact between the connecting rod 2 and the contact support during rotation becomes a line contact rather than a point contact, reducing the pressure on the contact surface, thereby reducing friction and wear, and extending the service life of the connecting rod and the contact support. At the same time, the arc groove 3-1 guides and limits the rotation of the connecting rod 2, ensuring that the connecting rod will not deviate from the predetermined trajectory during rotation, thereby enhancing the stability of the entire structure and reducing the safety risks caused by the deviation of the connecting rod. The arc groove 3-1 makes the installation and debugging of the connecting rod 2 simpler and more convenient. By adjusting the position of the connecting rod 2 in the arc groove 3-1, the position and angle of the moving contact can be easily adjusted to meet different usage requirements, and because the arc groove 3-1 provides a certain rotation range and flexibility, the circuit breaker can adapt to different working scenarios and operating requirements. Whether in normal operation or in an emergency, the circuit breaker can quickly and accurately complete the opening and closing actions. The two arc grooves 3-1 set at the bottom of the contact support 3 provide a flexible rotation space for the connecting rod 2, reduce friction and wear, enhance the stability of the structure, and simplify the installation and debugging process. Make the connection structure of the moving contact of the entire circuit breaker more reliable, efficient and easy to maintain.

[0033] As a preferred embodiment of the above, Figure 1 As shown, a countersunk hole 3 - 2 is provided on the side of the contact support 3 , and the fixed shaft 4 is inserted into the countersunk hole 3 - 2 to fix the connecting rod 2 on the contact support 3 .

[0034] As a preferred embodiment of the above, Figure 1 As shown, the bottom of the contact support 3 has a square groove 3-3 for placing the plug 6, and the side of the contact support 3 has two square through holes 3-4, which cooperate with the plug 6 to form a snap connection and limit the fixed shaft 4.

[0035] Specifically, the side of the contact support 3 is provided with a countersunk hole 3-2, and the fixed shaft 4 is inserted into the countersunk hole 3-2 to fix the connecting rod 2 on the contact support 3. The bottom of the contact support 3 is provided with a square groove 3-3 for placing the plug 6. The side of the contact support 3 has two square through holes 3-4, and the square through holes 3-4 cooperate with the plug 6 to form a structure for clamping and limiting the fixed shaft 4. The design of the countersunk hole 3-2 allows the fixed shaft 4 to be inserted, thereby firmly fixing the connecting rod 2 on the contact support 3. It ensures that the connecting rod 2 will not be accidentally displaced or loosened during operation. The combination of the square groove 3-3 and the square through hole 3-4 provides an accurate positioning point for the plug 6. The plug 6 is clamped on the contact support 3 through the square through hole 3-4 and limits the fixed shaft 4, further enhancing the stability of the entire structure. The countersunk hole 3-2 and the square groove 3-3 make the installation and disassembly of the fixed shaft 4 and the plug 6 very simple. Only the fixed shaft 4 needs to be inserted into the countersunk hole 3-2, and then the plug 6 is clamped on the contact support 3 through the square through hole 3-4 to complete the installation. When disassembling, only the reverse operation is required. The precise dimensions of the square groove 3-3 and the square through hole 3-4 ensure that the insert 6 can be tightly clamped on the contact support 3 and accurately limit the fixed shaft 4. This limiting function not only ensures the accuracy of the moving contact during the operation, but also effectively prevents failures caused by looseness or dislocation. By adjusting the position of the insert 6 in the square groove 3-3, the limiting position of the fixed shaft 4 can be conveniently adjusted to adapt to different operating requirements, so that the connection structure of the moving contact of the circuit breaker has higher adaptability and flexibility. Moreover, due to the stable structure and easy maintenance, this design can significantly extend the service life of the circuit breaker. At the same time, the precise limiting function also reduces the wear and damage caused by looseness or dislocation, further improving the reliability and stability of the circuit breaker. Combining the countersunk hole 3-2 on the side of the contact support 3 and the square groove 3-3 at the bottom with the square through hole 3-4 brings enhanced stability, easy installation and disassembly, precise limiting function, adaptability and flexibility, and extended service life to the connection structure of the moving contact of the circuit breaker.

[0036] As a preferred embodiment of the above, Figure 2 As shown, the connecting rod 2 is provided with a first connecting rod through hole 2-1 and a second connecting rod through hole 2-2; the first connecting rod through hole 2-1 cooperates with the fixed shaft 4 to make the connecting rod 2 rotatably connected with the fixed shaft 4; the second connecting rod through hole 2-2 cooperates with the cantilever through hole 1-2 on the cantilever 1-1, and the pin shaft 5 passes through the cantilever through hole 1-2 and the second connecting rod through hole 2-2 to fix the connecting rod 2 on the mechanism main shaft 1, and the connecting rod 2 is rotatably connected with the cantilever 1-1.

[0037] Specifically, a first connecting rod through hole 2-1 and a second connecting rod through hole 2-2 are provided on the connecting rod 2; the first connecting rod through hole 2-1 cooperates with the fixed shaft 4 to make the connecting rod 2 rotatably connected to the fixed shaft 4; the second connecting rod through hole 2-2 cooperates with the cantilever through hole 1-2 on the cantilever 1-1, and the pin 5 passes through the cantilever through hole 1-2 and the second connecting rod through hole 2-2 to fix the connecting rod 2 to the mechanism main shaft 1, and the structure in which the connecting rod 2 is rotatably connected to the cantilever 1-1 is used for the cooperation of the first connecting rod through hole 2-1 and the fixed shaft 4 to form a clear rotation connection point between the connecting rod 2 and the contact support 3. This design ensures that the connecting rod 2 can be accurately rotated around the fixed axis 4 when needed, thereby driving the moving contact to perform opening and closing operations. The second connecting rod through hole 2-2 and the cantilever through hole 1-2 are used in conjunction with the pin 5 to fix the connecting rod 2 on the mechanism main shaft 1, forming another stable rotation connection point. This double rotation connection enhances the stability and reliability of the entire structure. By passing the pin 5 through the cantilever through hole 1-2 and the second connecting rod through hole 2-2, the connecting rod 2 can be conveniently fixed to the mechanism main shaft 1. This design makes the installation process simple and quick, and is also convenient for subsequent adjustments and maintenance. Due to the existence of two rotation connection points (fixed shaft 4 and cantilever 1-1), the rotation of the connecting rod 2 can be precisely controlled to ensure that the moving contact moves accurately during the opening and closing process, thereby improving the performance and reliability of the circuit breaker. By adjusting the position of the pin 5 in the cantilever through hole 1-2 and the second connecting rod through hole 2-2, the connection angle and position between the connecting rod 2 and the mechanism main shaft 1 can be flexibly adjusted, so that the circuit breaker can adapt to different working scenes and operating requirements, thereby improving its adaptability and flexibility. The first connecting rod through hole 2-1 and the second connecting rod through hole 2-2 set on the connecting rod 2, and their coordination with the fixed shaft 4 and the cantilever through hole 1-2 on the cantilever 1-1, provide a clear rotation connection point and enhanced connection stability for the connection structure of the moving contact of the circuit breaker, while making it easy to install and adjust, with precise rotation control, and the effects of adaptability and flexibility.

[0038] As a preferred embodiment of the above, Figure 4 As shown, a boss 5 - 1 is provided on the left side of the pin 5 , and a pin through hole 5 - 2 is provided on the right side of the pin 5 .

[0039] Specifically, a boss 5 - 1 is provided on the left side of the pin shaft 5 , and a pin shaft through hole 5 - 2 is provided on the right side of the pin shaft 5 , so as to limit the left side of the pin shaft 5 and limit the insertion of the latch.

[0040] As a preferred embodiment of the above, Figure 3 As shown, the insert piece 6 is a square structure, and the insert piece 6 matches the square groove 3-3.

[0041] Specifically, the insert piece 6 is a square structure, and the structure in which the insert piece 6 cooperates with the square groove 3-3 is used to ensure a close fit between the insert piece 6 and the square groove 3-3. The square structure provides a stable contact surface, so that the insert piece 6 can be accurately inserted into the square groove 3-3, avoiding looseness or dislocation caused by shape mismatch. The size and shape of the square groove 3-3 match the insert piece 6, ensuring that the insert piece 6 can be fully embedded therein to form a stable connection. The close fit between the insert piece 6 and the square groove 3-3 ensures a stable connection between the contact support 3 and the connecting rod 2 or other related components, improves the overall structural stability of the circuit breaker, and reduces looseness or damage caused by vibration or external force. The cooperation of the square structure also makes the installation and disassembly process simpler and faster. The installation can be completed by simply inserting the insert piece 6 accurately into the square groove 3-3, and the insert piece 6 can be removed from the groove when disassembling.

[0042] As a preferred embodiment of the above, Figure 3 As shown, two clamping heads 6 - 1 are arranged on the inserting piece 6 , and the clamping heads 6 - 1 cooperate with the square through holes 3 - 4 to form a clamping connection and limit the fixed shaft 4 .

[0043] Specifically, two clamps 6-1 are provided on the insert 6, and the clamps 6-1 cooperate with the square through holes 3-4 to form a structure for clamping and limiting the fixed shaft 4, so that the two clamps 6-1 have specific shapes and sizes so as to cooperate with the square through holes 3-4 on the side of the contact support 3.

[0044] As a preferred embodiment of the above, Figure 1 As shown, when the inserting piece 6 is inserted into the square groove 3 - 3 , the clamping head 6 - 1 may be deformed inward to a certain extent so that the inserting piece 6 can be smoothly inserted into the square groove 3 - 3 .

[0045] Specifically, when the insert piece 6 is inserted into the square groove 3-3, the clamp head 6-1 can be deformed inward to a certain extent so that the insert piece 6 can be smoothly inserted into the square groove 3-3, so that the insertion process of the insert piece 6 is smoother and the installation difficulties caused by size mismatch or installation errors are reduced.

[0046] During installation, first insert the upper part of the connecting rod 2 into the arc groove 3-1 of the contact support 3, and then insert the fixed shaft 4 from the side countersunk hole 3-2 of the contact support 4, and pass through the connecting rod through hole 2-1 in sequence to the bottom. The connecting rod 2 can rotate on the fixed shaft 4, and then insert the insert piece 6 into the square groove 3-3 at the bottom of the contact support. When the insert piece 6 is inserted into the square groove 3-3, the clamping head 6-1 can be deformed inward to a certain extent, so that the insert piece 6 can be smoothly inserted into the square groove 3-3. The clamping head 6-1 cooperates with the square through hole 3-4 to form a clamping connection to limit the fixed shaft 4. The through hole 2-2 on the other side of the connecting rod 2 cooperates with the through hole 1-2 on the cantilever 1-1. The pin 5 passes through the through holes 1-2 and 2-2 at one time to fix the connecting rod 2 on the main shaft 1 of the mechanism. The latch is inserted into the through hole of the pin shaft 5-2 to limit the pin shaft 5-2. The connecting rod 2 and the cantilever 1-1 are rotatably connected. This structure is convenient for assembling and disassembling the moving contact. When the connecting rod is worn and affects the contact pressure and overtravel, and needs to be replaced, it is only necessary to remove the plug in the moving contact structure of the circuit breaker, pull out the fixed shaft, remove the connecting rod, install a new connecting rod, and then insert the fixed shaft and the plug. The screw-free installation causes damage to the contact support, and the contact support can be reused, which reduces costs and reduces the difficulty of installing the moving contact. This structure increases the width of the connecting rod, so that the connecting rod and the fixed shaft are more evenly stressed, the connecting rod is not easy to wear, the connection is tighter, and the installation and connection difficulty of the moving contact is reduced, which facilitates the maintenance, repair and adjustment of the entire structure.

[0047] The above shows and describes the basic principles, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principles of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A connection structure for a moving contact of a circuit breaker, characterized in that: It comprises a mechanism main shaft (1), a connecting rod (2), a contact support (3), a fixed shaft (4), a pin shaft (5), and an insert (6); One end of the connecting rod (2) is fixed to the contact support (3) via the fixed shaft (4), and the other end of the connecting rod (2) is fixed to the mechanism main shaft (1) via the pin shaft (5); The insert (6) is clamped on the contact support (3) and limits the fixed shaft (4).

2. The connection structure of the moving contact of the circuit breaker according to claim 1, characterized in that: The mechanism main shaft (1) is provided with a cantilever (1-1), the cantilever (1-1) is provided with a cantilever through hole (1-2), the pin shaft (5) passes through the cantilever through hole (1-2) to fix the connecting rod (2) on the mechanism main shaft (1), and the connecting rod (2) is rotatably connected to the mechanism main shaft (1).

3. The connection structure of the moving contact of the circuit breaker according to claim 2, characterized in that: The bottom of the contact support (3) is provided with two arc-shaped grooves (3-1), and the connecting rod (2) rotates in the arc-shaped grooves (3-1).

4. The connection structure of the moving contact of the circuit breaker according to claim 3, characterized in that: The side of the contact support (3) is provided with a countersunk hole (3-2), and the fixed shaft (4) is inserted into the countersunk hole (3-2) to fix the connecting rod (2) on the contact support (3).

5. The connection structure of the moving contact of the circuit breaker according to claim 4, characterized in that: The bottom of the contact support (3) is provided with a square groove (3-3) for accommodating the plug-in piece (6), and the side of the contact support (3) is provided with two square through holes (3-4), and the square through holes (3-4) cooperate with the plug-in piece (6) to form a snap connection and limit the fixed shaft (4).

6. The connection structure of the moving contact of the circuit breaker according to claim 5, characterized in that: The connecting rod (2) is provided with a first connecting rod through hole (2-1) and a second connecting rod through hole (2-2); the first connecting rod through hole (2-1) cooperates with the fixed shaft (4) so ​​that the connecting rod (2) is rotatably connected to the fixed shaft (4); the second connecting rod through hole (2-2) cooperates with the cantilever through hole (1-2) on the cantilever (1-1), the pin shaft (5) passes through the cantilever through hole (1-2) and the second connecting rod through hole (2-2) to fix the connecting rod (2) to the mechanism main shaft (1), and the connecting rod (2) is rotatably connected to the cantilever (1-1).

7. The connection structure of the moving contact of the circuit breaker according to claim 6, characterized in that: A boss (5-1) is arranged on the left side of the pin shaft (5), and a pin shaft through hole (5-2) is arranged on the right side of the pin shaft (5).

8. The connection structure of the moving contact of the circuit breaker according to claim 7, characterized in that: The inserting piece (6) is a square structure, and the inserting piece (6) matches the square groove (3-3).

9. The connection structure of the moving contact of the circuit breaker according to claim 8, characterized in that: The inserting piece (6) is provided with two clamping heads (6-1), and the clamping heads (6-1) cooperate with the square through holes (3-4) to form a clamping connection and limit the fixed shaft (4).

10. The connection structure of the moving contact of the circuit breaker according to claim 9, characterized in that: When the inserting piece (6) is inserted into the square groove (3-3), the clamping head (6-1) can be deformed inwards to a certain extent so that the inserting piece (6) can be smoothly inserted into the square groove (3-3).

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