Overload protection adjusting structure of circuit breaker

Abstract

The utility model discloses an overload protection adjusting structure of a circuit breaker, which comprises an adjusting frame, an adjusting screw and a calibration assembly, the adjusting screw and the calibration assembly are connected and arranged at the top of a circuit breaker body, and two side baffles are arranged on two sides of the top of the circuit breaker body. The protection cover plate is installed between the two side baffles through the buckle structure and covers the calibration assembly and the adjusting screw, so that a protection space for accommodating and covering the calibration assembly is formed at the top of the circuit breaker, and the protection cover plate plays a role in installation and protection of the calibration assembly and the adjusting screw which are installed at the top of the circuit breaker. Therefore, the calibration assembly is prevented from being influenced by collision in the product installation and transportation process, meanwhile, the situation that the adjustment angle of the bimetallic element is influenced due to direct misoperation or mistaken touch of the calibration assembly is avoided, the protection performance is good, and the adjustment operation stability and reliability of the overload protection adjustment structure are guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to low voltage electrical apparatus technical field, concretely relates to an overload protection adjusting structure of circuit breaker. BACKGROUND

[0002] The oil-immersed circuit breaker is a kind of power switch equipment using high insulation oil as medium.In power system, the oil-immersed circuit breaker is mainly used for protection and control of power transmission and distribution network, can cut off and isolate fault current in circuit, and protects power equipment and personal safety.When circuit works normally, circuit breaker can achieve power-off, power supply and circuit conversion by closing or opening circuit supplying power.

[0003] The existing oil-immersed circuit breaker has adjustable overload protection function, and overload protection is realized by thermal tripping mechanism of circuit breaker, and the thermal tripping mechanism mainly includes bimetallic strip, adjusting screw, adjusting support and adjusting calibration assembly, adjusting support is rotatably arranged in circuit breaker and is connected with adjusting screw and bimetallic strip respectively, adjusting calibration assembly can drive adjusting screw to rotate and make adjusting support swing, so as to realize the purpose of adjusting angle of bimetallic strip, and adjusting calibration assembly is arranged at top of circuit breaker in the form of multi-link structure, but adjusting calibration assembly is easily affected by collision during installation and transportation, which causes damage to adjusting calibration assembly and affects adjusting precision, and the protection is poor. SUMMARY

[0004] Therefore, the utility model solves the technical problem that adjusting calibration assembly is arranged at top of circuit breaker in prior art, and adjusting calibration assembly is easily affected by collision during installation and transportation, which affects adjusting precision and the protection is poor.

[0005] To solve the above technical problems, the utility model provides an overload protection adjusting structure of circuit breaker, which comprises adjusting frame, adjusting screw and calibration assembly, the adjusting screw is connected with the calibration assembly and arranged at top of circuit breaker body, the adjusting frame is rotatably arranged in the circuit breaker body under the drive of the adjusting screw, two side baffles higher than the top of the circuit breaker body are arranged on both sides of the circuit breaker body, a cover plate covering the adjusting screw and the calibration assembly is arranged between the two side baffles, the cover plate is fixedly connected with the two side baffles through buckle structure, and the protection space containing the calibration assembly is formed by the two side baffles and the cover plate connected at top of the circuit breaker body.

[0006] As a preferred scheme, the buckle structure comprises at least one buckle slot arranged on the two side baffles respectively, and at least one plug-in buckle arranged at both ends of the cover plate and matched with the buckle slot, and a guide slot extending obliquely and connecting the buckle slot is arranged at top of the side baffles.

[0007] As a preferred solution, the two side plates are respectively provided with a limiting boss connected to the lower side of the buckle groove, so that the cover plate abuts against the limiting boss when the cover plate is buckled with the side plate.

[0008] As a preferred solution, the circuit breaker body is provided with a support structure abutting against the middle part of the cover plate.

[0009] As a preferred solution, the circuit breaker body comprises two circuit breaker units arranged side by side, and the support structure is a support plate arranged between the two circuit breaker units, each circuit breaker unit is provided with an adjusting screw and an adjusting bracket, and the two adjusting screws of the two circuit breaker units are linked and matched through the calibration assembly.

[0010] As a preferred solution, the calibration assembly comprises two calibration rods respectively linked with the two adjusting screws, a transmission rod connecting the two calibration rods, and a driving rod rotatably arranged on the top of the circuit breaker body, the driving rod is movably connected with the transmission rod, and the driving rod is rotated by force to synchronously rotate the two calibration rods through the transmission rod.

[0011] As a preferred solution, a plurality of first adjusting holes are arranged on the transmission rod at intervals, the driving rod is provided with an adjusting groove extending along the length direction of the driving rod, and a first connecting piece is arranged through the first adjusting hole and the adjusting groove.

[0012] As a preferred solution, a plurality of second adjusting holes are arranged on the calibration rod at intervals, and the calibration rod and the transmission rod are connected through the second adjusting hole and the first adjusting hole by a second linkage.

[0013] As a preferred solution, the driving rod is rotatably arranged on the mounting boss on the top of the circuit breaker body through a rotating shaft, the driving rod is provided with a plurality of third adjusting holes through which the rotating shaft passes, and the plurality of third adjusting holes are distributed at one end of the adjusting groove along the length direction of the driving rod.

[0014] As a preferred solution, the adjusting handle assembly for driving the driving rod to rotate is further included, the adjusting handle assembly comprises a handle operating rod rotatably arranged on the mounting panel, a handle connecting plate fixed at one end of the handle operating rod, and a metal connecting rod connecting the handle connecting plate and the driving rod, the handle connecting plate is provided with a first hole connecting the metal connecting rod, the driving rod comprises a bent connecting end and a plurality of second holes arranged on the connecting end in a matrix, and the two ends of the metal connecting rod are respectively bent and connected in the first hole and the second hole.

[0015] As a preferred solution, the handle operating rod is provided with a pin hole structure on the convex end of the handle connecting plate, and a spring split pin is arranged in the pin hole structure to prevent the handle connecting plate from being separated from the handle operating rod.

[0016] Compared with the prior art, the technical scheme of the utility model has the following advantages:

[0017] 1. In the overload protection adjusting structure, the adjustment screw drives the adjusting frame to rotate under the drive of the calibration assembly, the bimetallic element is fixedly connected to the adjusting frame, so that the angle of the bimetallic element is adjusted, the calibration assembly and the adjusting screw are arranged on the top of the circuit breaker body, two side baffles are arranged on the two sides of the top of the circuit breaker body, the protective cover plate is installed between the two side baffles by the buckle structure and covers the calibration assembly and the adjusting screw, a protective space is formed on the top of the circuit breaker to accommodate the calibration assembly, the calibration assembly and the adjusting screw installed on the top of the circuit breaker are protected, so that the calibration assembly is not affected by collision during product installation and transportation, direct misoperation or accidental touch of the calibration assembly is avoided, the adjustment angle of the bimetallic element is not affected, the protection is good, and the adjustment operation stability and reliability of the overload protection adjusting structure are ensured.

[0018] 2. In the overload protection adjusting structure, the protective cover plate is installed between the two side baffles by the snap buckle and the buckle groove, the limiting boss abutting against the two ends of the protective cover plate is arranged on the two side baffles, and the supporting plate abutting against the middle part of the protective cover plate is arranged on the top of the circuit breaker, the limiting boss plays a limiting and supporting role on the two ends of the protective cover plate, the structural strength of the connection position of the snap buckle and the buckle groove is effectively enhanced, the supporting plate further supports the protective cover plate, the stress during installation is more balanced, so that the protective cover plate can better resist external impact, and therefore, the supporting plate with the limiting boss can effectively disperse the external force received by the protective cover plate, ensure the balance and stability of the installation position of the protective cover plate, and protect the adjusting structure.

[0019] 3. The overload protection adjusting structure, the calibration assembly comprises a calibration rod, a transmission rod and a driving rod, a plurality of first adjusting holes and a plurality of second adjusting holes are arranged on the transmission rod and the calibration rod respectively at intervals, and an adjusting groove is arranged on the driving rod, the first connecting piece passes through the adjusting groove and the first adjusting hole to realize the mounting connection between the driving rod and the transmission rod, the second connecting piece passes through the first adjusting hole and the second adjusting hole to realize the connection between the transmission rod and the sensing rod, the connection distance between the driving rod and the transmission rod can be adjusted through the position cooperation of the plurality of first adjusting holes and the adjusting groove, correspondingly, the connection distance between the driving rod and the sensing rod can be adjusted through the position cooperation of the plurality of second adjusting holes and the first adjusting hole, so that the connection positions between the calibration rod, the transmission rod and the driving rod and other components can be adjusted, so that the on-site installation and adjustment of the calibration assembly can be satisfied, the adjustment accuracy is guaranteed, the practicability is good, and the adjustment operation is convenient.

[0020] 4. The overload protection adjusting structure, one end of the metal connecting rod is connected in the first hole of the handle connecting plate, and the other end is connected in the second hole arranged on the driving rod, a plurality of second holes are arranged on the connecting end of the driving rod in a matrix, and the metal connecting rod is connected in the second hole at a suitable position according to the connection distance between the metal connecting rod and the driving rod, so that the connection distance between the metal connecting rod and the driving rod can be well adapted and adjusted, the applicability is good, and the motion and force can be transmitted between the handle connecting plate and the driving rod. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the specific embodiments of the utility model or the technical solutions in the prior art, the drawings needed in the specific embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating creative labor.

[0022] Figure 1 It is a structural schematic view of the overload protection adjusting structure of the circuit breaker of the utility model;

[0023] Figure 2 It is Figure 1 It is a structural schematic view after the hidden cover plate;

[0024] Figure 3 It is an installation structural schematic view of the calibration assembly of the utility model;

[0025] Figure 4 It is a schematic view of the internal structure of the circuit breaker provided by the utility model.

[0026] Explanation of reference signs: 1, calibration assembly; 11, calibration rod; 12, transmission rod; 13, drive rod; 14, adjusting groove; 15, first adjusting hole; 16, second adjusting hole; 17, third adjusting hole; 18, second hole; 19, rotating shaft; 2, adjusting screw; 3, adjusting frame; 4, side baffle; 41, buckle groove; 42, guide groove; 43, let go of slot; 5, cover plate; 50, protection space; 51, plug buckle; 6, limiting boss; 7, support structure; 8, adjusting handle assembly; 81, handle operating rod; 82, handle connecting plate; 83, metal connecting rod; 84, spring split pin; 9, circuit breaker body; 91, circuit breaker unit; 92, double gold element. DETAILED DESCRIPTION

[0027] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0028] In the description of the present application, it should be noted that the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0029] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0030] Embodiment

[0031] The present embodiment provides a kind of calibration assembly as described above, and it further includes: Figures 1-4The overload protection adjusting structure of the circuit breaker shown comprises an adjusting frame 3, an adjusting screw 2 and a calibration assembly 1, the adjusting screw 2 is arranged on the top of the circuit breaker body 9 in connection with the calibration assembly 1, the adjusting frame 3 is rotatably arranged in the circuit breaker body 9 driven by the adjusting screw 2, and a double metal element 92 fixedly connected to the adjusting frame 3 is arranged in the circuit breaker, which functions to drive the tripping mechanism of the circuit breaker to act when an overload fault occurs, thereby realizing the overload protection tripping of the circuit breaker. Two side plates 4 higher than the top of the circuit breaker body 9 are arranged on both sides of the circuit breaker body 9, a cover plate 5 covering the calibration assembly 1 and the adjusting screw 2 is installed between the two side plates 4, the cover plate 5 is fixedly connected to the two side plates 4 through a buckle structure, and the cover plate 5 and the two side plates 4 connected at the top of the circuit breaker body 9 form a protective space 50 accommodating the calibration assembly 1.

[0032] In the above embodiment, the cooperation of the calibration assembly 1, the adjusting screw 2 and the adjusting frame 3 realizes the adjustment of the swing angle of the double metal element 92, specifically, the adjusting screw 2 drives the adjusting frame 3 to rotate under the drive of the calibration assembly 1, the double metal element 92 is fixedly connected to the adjusting frame 3, thereby realizing the adjustment of the angle of the bimetallic strip, the calibration assembly 1 and the adjusting screw 2 are arranged on the top of the circuit breaker body 9, two side plates 4 are arranged on both sides of the top of the circuit breaker body 9, the cover plate 5 is installed between the two side plates 4 and covers the calibration assembly 1 and the adjusting screw 2 through a buckle structure, which forms a protective space 50 accommodating the calibration assembly 1 on the top of the circuit breaker, thereby playing a protective role for the calibration assembly 1 and the adjusting screw 2 installed on the top of the circuit breaker, avoiding the impact on the calibration assembly during product installation and transportation, and avoiding the direct misoperation or accidental touch of the calibration assembly 1 affecting the adjustment angle of the double metal element, which has good protection and ensures the stability and reliability of the adjustment operation of the overload protection adjusting structure.

[0033] As a preferred embodiment, as shown in Figures 1-2 The buckle structure comprises at least one buckle slot 41 arranged on each of the two side plates 4, and at least one plug-in buckle 51 arranged at both ends of the cover plate 5 and matched with the buckle slot 41, and a guide slot 42 inclinedly extending to connect the buckle slot 41 is arranged on the top of the side plate 4, which facilitates the plug-in buckle 51 to be more easily and accurately buckled into the buckle slot 41, and facilitates the plug-in buckle 51 and the buckle slot 41 to be matched to realize the installation and fixation of the cover plate 5 and the two side plates 4, which is convenient for installation and disassembly and improves the installation efficiency.

[0034] To enhance the pressure and impact resistance of the cover plate 5, each of the two side baffles 4 is provided with a limiting protrusion 6 connected to the lower side of the snap-fit ​​groove 41, so that the cover plate 5 abuts against the limiting protrusion 6 when it is engaged with the side baffles 4. At the same time, the top of the circuit breaker body 9 is provided with a support structure 7 that abuts against the middle of the cover plate 5. The support structure 7 can preferably be a support plate erected on the top of the circuit breaker body 9. In this structural configuration, the cover plate 5 is installed between the two side baffles 4 through the snap-fit ​​engagement of the plug-in buckle 51 and the snap-fit ​​groove 41. Limiting bosses 6 are provided on the two side baffles, abutting against both ends of the cover plate 5, and a support plate is provided on the top of the circuit breaker, abutting against the middle of the cover plate 5. The advantages of this design are that the limiting bosses 6 provide limiting support at both ends of the cover plate 5, effectively enhancing the structural strength of the connection between the plug-in buckle 51 and the snap-fit ​​groove 41. Furthermore, the support plate further supports the cover plate 5, resulting in more balanced installation force and allowing the cover plate 5 to better resist external impacts. Therefore, the support plate with limiting bosses effectively disperses external forces on the cover plate 5, ensuring the balance and stability of the cover plate's installation position and providing protection for the adjustment structure. In addition, according to the requirement that the circuit breaker has an external control line, a clearance slot 43 is opened on one of the side baffles 4, and a wire harness plug is provided on the top of the circuit breaker, so that the control line can pass through the clearance slot and connect to the wire harness plug.

[0035] The circuit breaker provided in this embodiment is an oil-immersed circuit breaker. Existing oil-immersed circuit breaker products can be divided into single-pole and multi-pole specifications, etc. A multi-pole circuit breaker is assembled from multiple single-pole circuit breaker units 91. Each circuit breaker unit 91 consists of a housing, a conductive system, a contact mechanism, a tripping mechanism, etc. As a preferred embodiment, this oil-immersed circuit breaker adopts a two-pole structure, such as... Figure 3 As shown, the circuit breaker body 9 includes two circuit breaker units 91 arranged side by side. The support structure 7 is a support plate arranged between the two circuit breaker units 91. Each circuit breaker unit 91 is provided with an adjusting screw 2 and an adjusting bracket 3. The two adjusting screws 2 of the two circuit breaker units are linked together through the calibration component 1.

[0036] The following is combined Figures 1-4 The specific setup method of the calibration component is described in detail below:

[0037] The calibration assembly 1 comprises two calibration rods 11 respectively connected with two adjusting screws 2, a transmission rod 12 connecting the two calibration rods 11, and a driving rod 13 rotatably arranged on the top of the circuit breaker body 9, the driving rod 13 is movably connected with the transmission rod 12, when the driving rod 13 is forced to rotate, the two execution rods are synchronously rotated through the transmission rod 12, and the two execution rods respectively drive the two adjusting screws 2 to rotate by a certain angle, so as to drive the adjusting frame 3 to rotate, and finally realize the purpose of adjusting the swing angle of the double gold element 92, which plays a role in adjusting the overload tripping time and speed of the circuit breaker.

[0038] A plurality of first adjusting holes 15 are arranged on the transmission rod 12, the driving rod 13 is provided with an adjusting groove 14 along the length direction, a first connecting piece is arranged between the adjusting groove 14 and one of the first adjusting holes 15, so as to connect the transmission rod 12 with the driving rod 13, a plurality of second adjusting holes 16 are arranged on the calibration rod 11, and the transmission rod 12 is connected with the calibration rod 11 through a second connecting piece passing through the second adjusting hole 16 and the first adjusting hole 15, the driving rod 13 is arranged on the mounting boss on the top of the circuit breaker body 9 through a rotating shaft 19, the driving rod 13 is provided with a plurality of third adjusting holes 17 through which the rotating shaft 19 passes, the third adjusting holes 17 are distributed on one end of the adjusting groove 14 along the length direction of the driving rod 13, the driving rod is rotatably arranged on the rotating shaft through the third adjusting hole, and the driving rod is mounted and limited on the rotating shaft through a snap spring, so as to prevent the driving rod from being separated from the rotating shaft, the rotating shaft is integrally formed on the mounting boss in an insert injection molding manner, or is fixed on the mounting boss in a threaded structure, and the position of the rotating center of the driving rod 13 can be adjusted through the third adjusting hole 17. Through the first connecting piece passing through the adjusting groove 14 and the first adjusting hole 15, the driving rod 13 is connected with the transmission rod 12, and through the second connecting piece passing through the first adjusting hole 15 and the second adjusting hole 16, the transmission rod 12 is connected with the calibration rod 11, through the position cooperation of the plurality of first adjusting holes 15 and the adjusting groove 14, the connection distance between the driving rod 13 and the transmission rod 12 can be adjusted, and correspondingly, through the position cooperation of the plurality of second adjusting holes 16 and the first adjusting hole 15, the connection distance between the driving rod 13 and the sensing rod can be adjusted, so that the connection positions of the calibration rod 11, the transmission rod 12 and the driving rod 13 can be adjusted, which can meet the on-site installation and adjustment of the calibration assembly, ensure the adjustment accuracy, has good practicability, and is convenient to adjust.

[0039] The overload protection adjusting structure of the embodiment further comprises an adjusting handle assembly 8 for driving the driving rod 13 to rotate, referring to Figure 2The adjusting handle assembly 8 comprises a handle operating rod 81 rotatably arranged on the mounting panel, a handle connecting plate 82 fixed at one end of the handle operating rod 81, and a metal connecting rod 83 connecting the handle connecting plate 82 and the driving rod 13. Specifically, the handle operating rod has a protruding end penetrating the handle connecting plate and a pin hole structure arranged on the protruding end, and a spring split pin 84 for preventing the handle connecting plate from being separated from the handle operating rod is arranged in the pin hole structure. The spring split pin 84 plays a limiting and fixing role on the handle operating rod and the handle connecting plate. The handle connecting plate is provided with a guide inclined surface at one end of the pin hole structure, which plays a guiding role when the spring split pin is installed through the pin hole structure. The handle connecting plate 82 is provided with a first hole for connecting the metal connecting rod 83. The driving rod 13 comprises a bent connecting end and a plurality of second holes 18 arranged in a matrix on the connecting end. The two ends of the metal connecting rod 83 are respectively bent and connected in the first hole and the second hole 18, so that a multi-link transmission structure is formed between the handle operating rod, the handle connecting plate, the metal connecting rod, the driving rod, the transmission rod and the calibration rod. The metal connecting rod in the form of a round rod can be adapted to rotate in the first hole and the second hole. Therefore, when the handle connecting plate rotates under the drive of the handle operating rod, the driving rod is rotated around the rotation shaft by a certain angle through the metal connecting rod, and finally the calibration rod drives the adjusting screw to rotate by a certain angle. The advantage of this design is that the metal connecting rod 83 can be connected to the second hole 18 at a suitable position according to the connection distance between the driving rod 13, which can well adapt to adjust the connection distance between the metal connecting rod 83 and the driving rod 13, and has good applicability, thereby playing a role in transmitting motion and force between the handle connecting plate and the driving rod.

[0040] Obviously, the above embodiments are only examples for clearly illustrating the present application, and are not intended to limit the embodiments. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, all the embodiments cannot be exhausted, and the obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. An overload protection adjustment structure for a circuit breaker, comprising an adjustment frame (3), an adjustment screw (2), and a calibration component (1), wherein the adjustment screw (2) is connected to the calibration component (1) and disposed on the top of the circuit breaker body (9), and the adjustment frame (3) is rotatably disposed within the circuit breaker body (9) driven by the adjustment screw (2), characterized in that: The circuit breaker body (9) is provided with two side plates (4) higher than the top of the circuit breaker body (9), a cover plate (5) is arranged between the two side plates (4) and covers the adjusting screw (2) and the calibration assembly (1), the cover plate (5) is fixedly connected with the two side plates (4) through a buckle structure, and the top of the circuit breaker body (9) is connected with the cover plate (5) through the two side plates (4) to form a protection space (50) for accommodating the calibration assembly (1).

2. The overload protection adjusting structure of the circuit breaker according to claim 1, characterized in that: The buckle structure comprises at least one buckle slot (41) arranged on each of the two side plates (4) and at least one plug buckle (51) arranged at the two ends of the cover plate (5) and matched with the buckle slot (41), and a guide slot (42) is arranged on the top of the side plate (4) and extends to connect the buckle slot (41).

3. The overload protection adjustment structure of the circuit breaker according to claim 2, characterized in that: The two side plates (4) are respectively provided with a limiting boss (6) connected to the lower side of the buckle slot (41), so that the cover plate (5) is abutted on the limiting boss (6) when the cover plate (5) is matched with the side plate (4).

4. The overload protection adjusting structure of the circuit breaker according to claim 3, characterized in that: The top of the circuit breaker body (9) is provided with a support structure (7) abutting against the middle position of the cover plate (5).

5. The overload protection adjustment structure of the circuit breaker according to any one of claims 1 to 4, characterized in that: The circuit breaker body (9) comprises two circuit breaker units (91) arranged side by side, a support structure (7) is arranged between the two circuit breaker units (91), the support structure (7) is a support plate, each circuit breaker unit (91) is provided with an adjusting screw (2) and an adjusting frame (3), and the two adjusting screws (2) of the two circuit breaker units (91) are connected through the calibration assembly (1).

6. The overload protection adjustment structure of the circuit breaker according to claim 5, characterized in that: The calibration assembly (1) comprises two calibration rods (11) connected with the two adjusting screws (2) respectively, a transmission rod (12) connecting the two calibration rods (11), and a driving rod (13) rotatably arranged on the top of the circuit breaker body (9), the driving rod (13) is movably connected with the transmission rod (12), and when the driving rod (13) is rotated under force, the two calibration rods (11) are synchronously rotated through the transmission rod (12).

7. The overload protection adjustment structure of the circuit breaker according to claim 6, characterized in that: A plurality of first adjusting holes (15) are arranged on the transmission rod (12) at intervals, an adjusting slot (14) is arranged on the driving rod (13) along the length direction of the driving rod (13), and a first connecting piece is arranged between the adjusting slot (14) and one of the first adjusting holes (15).

8. The overload protection adjustment structure of claim 7, wherein: A plurality of second adjusting holes (16) are arranged on the calibration rod (11) at intervals, and a second connecting piece is arranged between the calibration rod (11) and the transmission rod (12) to connect the second adjusting hole (16) and the first adjusting hole (15).

9. The overload protection adjustment structure of claim 8, wherein: The driving rod (13) is arranged on the mounting boss on the top of the circuit breaker body (9) through a rotating shaft (19), the driving rod (13) is provided with a plurality of third adjusting holes (17) through which the rotating shaft (19) passes, and the plurality of third adjusting holes (17) are distributed at one end of the adjusting slot (14) along the length direction of the driving rod (13).

10. The overload protection adjustment structure of the circuit breaker according to any one of claims 6 to 9, characterized in that: The adjusting handle assembly (8) for driving the driving rod (13) to rotate comprises a handle operating rod (81) rotatably arranged on the mounting panel, a handle connecting plate (82) fixed at one end of the handle operating rod (81), and a metal connecting rod (83) connecting the handle connecting plate (82) and the driving rod (13), wherein the handle operating rod is provided with a pin hole structure on the convex end of the handle connecting plate, and a spring opening pin is arranged in the pin hole structure; a plurality of first holes for connecting the metal connecting rod (83) are arranged on the handle connecting plate (82), the driving rod (13) comprises a bent connecting end and a plurality of second holes (18) arranged in a matrix on the connecting end, and the two ends of the metal connecting rod (83) are respectively bent and connected in the first holes and the second holes (18).

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