A fixture for checking overload characteristics of molded case circuit breakers

Abstract

The application relates to the technical field of electrical connection devices, in particular to a clamp for checking the overload characteristics of a molded case circuit breaker. The clamp mainly comprises a bottom plate, a first positioning plate and a second positioning plate. The bottom surface of the bottom plate is in contact with the traction rod of the circuit breaker to realize positioning in the first direction. The first positioning plate and the second positioning plate are arranged side by side along the second direction and jointly enclose a space for accommodating the traction rod with the bottom plate, and the surface of the first positioning plate close to the second positioning plate is used for being in contact with the surface of the traction rod away from the bimetallic component in the second direction to realize positioning of the bottom plate and the traction rod in the second direction. The clamp significantly improves the accuracy of gap adjustment between the bimetallic component and the traction rod through bidirectional positioning. Meanwhile, the second positioning plate in contact with the bimetallic component is used as a clear adjustment standard, so that the operation is simple and unified, the dependence on personnel experience is effectively reduced, and the adjustment efficiency and consistency are improved.

Description

Technical Field

[0001] This application relates to the field of electrical connection device technology, and in particular to a fixture for verifying the overload characteristics of a molded case circuit breaker. Background Technology

[0002] The thermal trip structure is a crucial component of molded case circuit breakers (MCCBs). The bimetallic assembly, traction rod, and tripping mechanism are the core components of the thermal trip structure. When the current flowing through the MCCB exceeds the rated current, the bimetallic strip in the bimetallic assembly bends due to heat. When the bending amount exceeds the gap between the bimetallic assembly and the traction rod, the traction rod is pushed by the bimetallic assembly, triggering the tripping mechanism and causing the MCCB to open, thus achieving overload protection for the line and equipment. Therefore, the gap between the bimetallic assembly and the traction rod determines the overload tripping characteristics of the MCCB.

[0003] Currently, the gap between the bimetallic assembly and the pull rod is mainly adjusted manually by visual inspection or by using a feeler gauge, which is inconvenient to operate and highly dependent on the experience of the operator. Utility Model Content

[0004] This application provides a fixture for verifying the overload characteristics of a molded case circuit breaker, which can improve the efficiency and accuracy of gap adjustment between the bimetallic assembly and the traction rod.

[0005] The technical solution of this application is as follows: The fixture for verifying the overload characteristics of molded case circuit breakers provided in this application includes a base plate, a first positioning plate, and a second positioning plate.

[0006] Along the first direction, the base plate includes a top surface and a bottom surface that are positioned opposite each other. The bottom surface is used to contact the traction rod of the molded case circuit breaker to achieve positioning of the base plate and the traction rod in the first direction.

[0007] The first positioning plate and the second positioning plate are arranged side by side along the second direction and are both connected to the base plate. The space enclosed by the three plates is sufficient to accommodate the traction rod. The surface of the first positioning plate closest to the second positioning plate is used to contact the surface of the traction rod away from the bimetallic assembly in the second direction, thereby positioning the base plate and the traction rod in the second direction. The surface of the second positioning plate away from the first positioning plate is the contact and positioning surface of the bimetallic assembly in the second direction. The second direction is perpendicular to the first direction.

[0008] Based on the fixture for verifying the overload characteristics of molded case circuit breakers provided in this application, the bottom surface of the base plate is used to contact the traction rod of the molded case circuit breaker, achieving positioning of the base plate and the traction rod in the first direction. The surface of the first positioning plate near the second positioning plate is used to contact the surface of the traction rod away from the bimetallic assembly in the second direction, achieving positioning of the base plate and the traction rod in the second direction. Thus, when adjusting the gap between the bimetallic assembly and the traction rod using the fixture of this application, the fixture and the traction rod are positioned in both the first and second directions, thereby improving the accuracy of gap adjustment. Furthermore, the standard for adjusting the position of the bimetallic assembly is based on the contact between the bimetallic assembly and the second positioning plate. This standard is very clear, and operators, regardless of experience, can operate accurately, which not only improves the accuracy of adjustment but also increases adjustment efficiency.

[0009] In one possible design, the first positioning plate and the base plate are an integral structure.

[0010] Based on the fixture for verifying the overload characteristics of molded case circuit breakers provided in this embodiment, the first positioning plate and the base plate can be manufactured as a single piece, which helps to improve the dimensional fit between the two. Since both the base plate and the first positioning plate have positioning functions, improving the dimensional fit between the two helps to improve the accuracy of gap adjustment.

[0011] In one possible design, the surface of the pull rod away from the bimetallic assembly in the second direction includes a first surface and a second surface, the first surface being a plane. The first and second surfaces are arranged side by side along a third direction and are located in different planes.

[0012] Along the third direction, the first positioning plate includes at least one positioning sub-plate and a first clearance groove. The surface of the positioning sub-plate near the second positioning plate is used for contact positioning with the first surface, and the first clearance groove is used to avoid the second surface. The third direction is perpendicular to the first and second directions.

[0013] Based on the fixture for verifying the overload characteristics of molded case circuit breakers provided by this embodiment, when the fixture is in use, the first positioning sub-plate can cooperate with the first surface of the traction rod away from the bimetallic component in the second direction, and the second surface can be avoided by the first clearance groove. In this way, it is beneficial to achieve contact positioning between the first positioning plate and the traction rod in the second direction, and the structure of the first positioning plate itself is also easier to process and manufacture.

[0014] In one possible design, the second positioning plate and the base plate are an integral structure.

[0015] Based on the fixture for verifying the overload characteristics of molded case circuit breakers provided by this embodiment, when the second positioning plate and the base plate are an integral structure, the second positioning plate and the base plate can be manufactured as a single unit. This helps to improve the fitting accuracy between the two, thereby improving the accuracy of gap adjustment and making it convenient to use.

[0016] In one possible design, the base plate also includes multiple insertion slots, which penetrate the base plate along a first direction. Along a second direction, the multiple insertion slots are arranged side-by-side. The second positioning plate can be inserted into and connected to the base plate through any one of these insertion slots.

[0017] The fixture for verifying the overload characteristics of molded case circuit breakers provided by this embodiment can adjust the position of the bimetallic component in molded case circuit breakers with different rated currents by setting different plug slots. It is convenient to use and cost-effective.

[0018] In one possible design, the second positioning plate includes an integral body and a connector, and a second positioning surface is formed between the connector and the body along a first direction.

[0019] After the second positioning plate is inserted into the base plate, the main body is located on one side of the top surface of the base plate, the second positioning surface is in contact with the top surface, at least part of the insertion part is located on one side of the bottom surface, and the surface of the insertion part away from the first positioning plate is the contact positioning surface of the bimetallic assembly.

[0020] Based on the fixture for verifying the overload characteristics of molded case circuit breakers provided in this embodiment, when the second positioning plate and the base plate are inserted, the second positioning surface can keep the main body on one side of the top surface, preventing the second positioning plate from falling off and facilitating insertion and removal. In addition, the second positioning surface can ensure that the insertion part has sufficient insertion depth, and the insertion part can be directly aligned with the bimetallic component, thereby ensuring the normal operation of the adjustment process.

[0021] In one possible design, there are n connectors, which are arranged along a third direction, where n is 2, 3, or 4, and the third direction is perpendicular to the first and second directions.

[0022] The insertion slot includes multiple insertion sub-slots that correspond one-to-one with multiple insertion parts, and the second positioning plate is connected to the base plate through the multiple insertion sub-slots.

[0023] Based on the fixture for verifying the overload characteristics of molded case circuit breakers provided in this embodiment, the fixture can be used to adjust the position of multiple bimetallic components in a multiphase molded case circuit breaker. Each plug part can be aligned with a bimetallic component. In this way, the position of different bimetallic components in the molded case circuit breaker can be adjusted at one time using the same fixture, which helps to improve the adjustment efficiency.

[0024] In one possible design, a handle is also provided on the top surface.

[0025] Based on the clamp for verifying the overload characteristics of molded case circuit breakers provided by this embodiment, on the one hand, the handle facilitates the operator's handling of the clamp. On the other hand, the operator can apply external force to the clamp through the handle, thereby enabling the clamp to be accurately positioned with the traction rod, which helps to improve the accuracy of the clamp's position calibration of the bimetallic component.

[0026] In one possible design, the second positioning plate is also provided with a second clearance groove for avoiding the handle.

[0027] Based on the fixture for verifying the overload characteristics of molded case circuit breakers provided by this embodiment, a second clearance groove is provided on the second positioning plate, which can prevent the installation between the second positioning plate and the base plate from being affected by the handle, and the area of ​​the top surface of the base plate can be more fully utilized, and the fixture structure is also more compact.

[0028] In one possible design, the base plate, the first positioning plate, and the second positioning plate are made of alloy tool steel. Alloy tool steel has the characteristics of good rigidity and high hardness, and is not easily deformed, which can ensure the accuracy of gap adjustment. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of a clamp provided in an embodiment of this application.

[0030] Figure 2 for Figure 1 The diagram shows the fit between the clamp, the bimetallic component in the molded case circuit breaker, and the traction rod.

[0031] Figure 3 This is a schematic diagram of a traction rod structure in a molded case circuit breaker.

[0032] Figure 4 The diagram shown is a schematic diagram of the combined structure of the base plate and the first positioning plate in the fixture provided in the embodiment of this application.

[0033] Figure 5 To and Figure 4 A schematic diagram of the structure of the second positioning plate that mates with the structure shown.

[0034] Figure 6 This is a schematic diagram of the structure of a clamp and bimetallic component and traction rod combination in a multiphase molded case circuit breaker provided in an embodiment of this application.

[0035] The attached figures are labeled as follows: 1. Fixture; 11. Base plate; 111. Top surface; 112. Bottom surface; 113. Insertion slot; 1131. Insertion sub-slot; 12. First positioning plate; 121. Positioning sub-plate; 122. First clearance groove; 13. Second positioning plate; 131. Main body; 132. Insertion part; 133. Second positioning surface; 134. Second clearance groove; 14. Handle; 2. Traction rod; 20. End face of the traction rod away from the base of the molded case circuit breaker; 21. First surface; 22. Second surface; 3. Bimetallic assembly; 31. Screw; D1, First Direction; D2, Second Direction; D3, Third Direction. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The terms “comprising” and “having”, and any variations thereof, in the specification, claims, and drawings of this application are intended to cover non-exclusive inclusion.

[0038] The term "embodiment" as used herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of the phrase "embodiment" in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0039] Furthermore, the terms "first," "second," etc., in the specification and claims of this application or in the aforementioned drawings are used to distinguish different objects rather than to describe a specific order, and may explicitly or implicitly include one or more of the features.

[0040] In the description of this application, unless otherwise stated, "multiple" means two or more (including two).

[0041] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, "connection" or "joining" in mechanical structures can refer to a physical connection. A physical connection can be a fixed connection, such as a connection secured by spacers, screws, bolts, or other spacers. A physical connection can also be a detachable connection, such as a snap-fit ​​or interlocking connection. A physical connection can also be an integral connection, such as a connection formed by welding, bonding, or integral molding. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0042] The present application will be described in detail below with reference to the accompanying drawings.

[0043] Figure 1 This is a schematic diagram of the structure of a clamp provided in an embodiment of this application. Figure 2 for Figure 1 The diagram shows the fit between the clamp, the bimetallic component in the molded case circuit breaker, and the traction rod.

[0044] Please refer to Figure 1 and Figure 2 The fixture 1 for verifying the overload characteristics of a molded case circuit breaker provided in this application includes a base plate 11, a first positioning plate 12 and a second positioning plate 13.

[0045] Along the first direction D1, the base plate 11 includes a top surface 111 and a bottom surface 112 that are positioned opposite each other. The bottom surface 112 is used to contact the traction rod 2 of the molded case circuit breaker to achieve positioning of the base plate 11 and the traction rod 2 in the first direction D1.

[0046] The first positioning plate 12 and the second positioning plate 13 are arranged side by side along the second direction D2 and are both connected to the base plate 11. The space enclosed by the three plates is sufficient to accommodate the traction rod 2. The surface of the first positioning plate 12 closest to the second positioning plate 13 is used to contact the surface of the traction rod 2 away from the bimetallic component 3 in the second direction D2, thereby positioning the base plate 11 and the traction rod 2 in the second direction D2. The surface of the second positioning plate 13 away from the first positioning plate 12 is the contact and positioning surface of the bimetallic component 3 in the second direction D2. The second direction D2 is perpendicular to the first direction D1.

[0047] Figure 3 This is a schematic diagram of a traction rod structure in a molded case circuit breaker. Please refer to... Figures 1 to 3 In a molded case circuit breaker, the traction rod 2 is one of the core components of the thermal trip structure. The traction rod 2 is rotatably connected in the molded case circuit breaker. When the molded case circuit breaker is not energized, along the first direction D1, the end face 20 of the traction rod away from the base of the molded case circuit breaker includes a plane.

[0048] The clamp 1 of this application uses the plane of the end of the traction rod 2 away from the base of the molded case circuit breaker as the first reference plane, and the bottom surface 112 of the base plate 11 contacts the first reference plane, thereby realizing the positioning of the clamp 1 and the traction rod 2 in the first direction D1.

[0049] Based on this, along the second direction D2, in the molded case circuit breaker, a bimetallic assembly 3 is provided on one side of the traction rod 2, and a tripping mechanism is provided on the other side of the traction rod 2. The gap between the surface of the traction rod 2 near the bimetallic assembly 3 and the bimetallic assembly 3 affects the overload tripping characteristics of the molded case circuit breaker. When the current flowing through the molded case circuit breaker exceeds the rated current, the bimetallic assembly 3 bends and deforms, striking the traction rod 2 and causing the traction rod 2 to rotate towards the tripping mechanism, thereby triggering the tripping mechanism and causing the molded case circuit breaker to open.

[0050] The clamp 1 of this application uses the surface of the traction rod 2 in the second direction D2 away from the bimetallic component 3 as a second reference surface, and the first positioning plate 12 of the clamp 1 is positioned in contact with this second reference surface. The second positioning plate 13 is arranged side by side with the first positioning plate 12 in the second direction D2. According to the gap requirement between the bimetallic component 3 and the traction rod 2, the distance between the second positioning plate 13 and the first positioning plate 12 can be determined, so that the surface of the second positioning plate 13 away from the first positioning plate 12 becomes the calibration surface for the gap between the bimetallic component 3 and the traction rod 2.

[0051] In use, the clamp 1 provided in this application is placed on the traction rod 2. The first positioning plate 12 and the second positioning plate 13 are located on opposite sides of the traction rod 2 in the second direction D2, so that the bottom surface 112 of the base plate 11 contacts the plane of the traction rod 2 away from the circuit breaker base, and the first positioning plate 12 contacts the surface of the traction rod 2 away from the bimetallic assembly 3. Then, the distance between the bimetallic assembly 3 and the second positioning plate 13 is adjusted so that the part of the bimetallic assembly 3 used to strike the traction rod 2 contacts the second positioning plate 13. In this way, the adjustment of the gap between the bimetallic assembly 3 and the traction rod 2 is completed.

[0052] As can be seen from the above, when adjusting the gap between the bimetallic component 3 and the traction rod 2 using the clamp 1 of this application, both the clamp 1 and the traction rod 2 are positioned in the first direction D1 and the second direction D2, thus improving the accuracy of the gap adjustment. Furthermore, the standard for adjusting the position of the bimetallic component 3 is based on the contact between the bimetallic component 3 and the second positioning plate 13. This allows operators, regardless of experience, to operate accurately, which not only improves the accuracy of the adjustment but also increases the adjustment efficiency.

[0053] It should be noted that, in one embodiment of this application, a screw 31 is provided at one end of the bimetallic component 3 for striking the traction rod 2, and the screw 31 is used to strike the traction rod 2 in the event of overcurrent. Therefore, when adjusting the position of the bimetallic component 3, the distance between the screw 31 and the traction rod 2 is mainly adjusted.

[0054] In other embodiments of this application, the bimetallic component 3 used to strike one end of the traction rod 2 may also adopt other structural forms. But essentially, adjusting the position of the bimetallic component 3 is equivalent to adjusting the gap between its striking end and the traction rod 2.

[0055] Figure 4 The diagram shown is a schematic representation of the combined structure of the base plate and the first positioning plate in the fixture provided in this embodiment of the application. Please refer to the diagram for details. Figure 1 , Figure 2 and Figure 4 In one embodiment of this application, the first positioning plate 12 and the base plate 11 are an integral structure.

[0056] Specifically, as mentioned above, the bottom surface 112 of the base plate 11 is used for positioning the clamp 1 and the traction rod 2 in the first direction D1, and the surface of the first positioning plate 12 near the second positioning plate 13 is used for positioning the clamp 1 and the traction rod 2 in the second direction D2. Thus, both the base plate 11 and the first positioning plate 12 have positioning functions. In this embodiment, the first positioning plate 12 and the base plate 11 are an integral structure, which allows them to be manufactured as a single piece. This helps to improve the dimensional fit between the two, thereby improving the accuracy of gap adjustment.

[0057] It should be noted that in some other embodiments of this application, the first positioning plate 12 and the base plate 11 may also adopt a separate structure, so that the two can be assembled by means of plug-in connection, threaded connection, pin connection, etc.

[0058] Please combine Figure 2 and Figure 3 In one embodiment of this application, the surface of the traction rod 2 away from the bimetallic component 3 in the second direction D2 includes a first surface 21 and a second surface 22, wherein the first surface 21 is a plane. The first surface 21 and the second surface 22 are arranged side by side along the third direction D3 and are located in different planes.

[0059] Please combine Figures 2 to 4 Along the third direction D3, the first positioning plate 12 includes at least one positioning sub-plate 121 and a first clearance groove 122. The surface of the positioning sub-plate 121 near the second positioning plate 13 is used for contact positioning with the first surface 21, and the first clearance groove 122 is used to avoid the second surface. The third direction D3 is perpendicular to the first direction D1 and the second direction D2.

[0060] Specifically, some molded case circuit breakers (MCCBs) are equipped with both a thermal tripping mechanism to prevent overcurrent and a residual current device (RCD) protection mechanism. The traction rod 2 needs to work in conjunction with the bimetallic component 3 in the thermal tripping mechanism to activate the tripping mechanism and trip the MCCB when an overcurrent occurs. It also needs to work in conjunction with the RCD protection mechanism to activate the tripping mechanism and trip the MCCB when the leakage current exceeds the rated value. Therefore, the traction rod 2 has both a part that works with the bimetallic component 3 and a part that works with the RCD protection mechanism.

[0061] From an overall structural perspective, the shape of the traction rod 2 is somewhat irregular. The surface of the traction rod 2 away from the bimetallic component 3 in the second direction D2 includes a first surface 21 and a second surface 22. The first positioning plate 12 of this application includes at least one positioning sub-plate 121 and a first clearance groove 122. The first positioning sub-plate 121 cooperates with the first surface 21 of the traction rod 2 away from the bimetallic component 3 in the second direction D2, and the first clearance groove 122 avoids a portion of the second surface 22. This facilitates contact positioning between the first positioning plate 12 and the traction rod 2 in the second direction D2, and the structure of the first positioning plate 12 itself is also easier to process and manufacture.

[0062] Please continue to refer to this. Figure 1 and Figure 2 In one embodiment of this application, the second positioning plate 13 and the base plate 11 are an integral structure.

[0063] Specifically, when the second positioning plate 13 and the base plate 11 are an integral structure, the second positioning plate 13 and the base plate 11 can be manufactured as a single piece. This helps to improve the fitting accuracy between the two, thereby improving the accuracy of gap adjustment and making it convenient to use.

[0064] In the design and manufacturing of molded case circuit breakers (MCCBs), different rated currents are used depending on the application requirements. Sometimes, MCCBs with the same shape may have different rated currents. For these types of MCCBs, different rated currents will result in different gaps when adjusting the gap between the bimetallic assembly 3 and the traction rod 2. Smaller rated currents correspond to smaller gaps, and larger rated currents correspond to larger gaps.

[0065] Figure 5 To and Figure 4 The diagram shows the structure of the second positioning plate 13 that mates with the structure shown. Please refer to... Figure 4 and Figure 5In order to adjust molded case circuit breakers of the same shape but different rated currents using the same clamp 1, in one embodiment of this application, the base plate 11 further includes multiple insertion slots 113. Along the first direction D1, the insertion slots 113 penetrate the base plate 11. Along the second direction D2, the multiple insertion slots 113 are arranged side by side. The second positioning plate 13 can be inserted and connected to the base plate 11 through any one of the insertion slots 113.

[0066] by Figure 4 Taking the structure shown as an example, in Figure 4 In the design, the base plate 11 has two insertion slots 113 along the second direction D2, and the distances between the two insertion slots 113 and the first positioning plate 12 are different. The distances between the different insertion slots 113 and the first positioning plate 12 are set according to the gap between the bimetallic component 3 and the traction rod 2 in the molded case circuit breaker with different rated currents. In use, according to the different rated currents of the molded case circuit breaker, the second positioning plate 13 is inserted into the corresponding insertion slot 113, thereby realizing the adjustment of the position of the bimetallic component 3 in the molded case circuit breaker with different rated currents using the same clamp 1.

[0067] For example, in Figure 4 In the structure shown, the plug slot 113 closer to the first positioning plate 12 is suitable for adjusting the position of the bimetallic component 3 in a molded case circuit breaker with a rated current of 80A. The plug slot 113 farther from the first positioning plate 12 is suitable for adjusting the position of the bimetallic component 3 in a molded case circuit breaker with a rated current of 100A.

[0068] It should be noted that, depending on the actual application requirements, the number of insertion slots 113 on the base plate 11 can be two, three, or other.

[0069] Please continue to refer to this. Figure 5 In some embodiments of this application, the second positioning plate 13 includes an integral body portion 131 and a plug portion 132, and a second positioning surface 133 is formed between the plug portion 132 and the body portion 131 along the first direction D1.

[0070] Please combine Figure 2 , Figure 4 and Figure 5 After the second positioning plate 13 is inserted into the base plate 11, the main body 131 is located on one side of the top surface 111 of the base plate 11, the second positioning surface 133 is in contact with the top surface 111, at least a part of the insertion part 132 is located on one side of the bottom surface 112, and the surface of the insertion part 132 away from the first positioning plate 12 is the contact positioning surface of the bimetallic component 3.

[0071] This design allows the body 131 of the second positioning plate 13 to be stably positioned on one side of the top surface 111 during insertion, which can prevent it from falling off and facilitate insertion and removal. In addition, the second positioning surface 133 allows the insertion part 132 to have sufficient insertion depth, and the insertion part 132 can be directly aligned with the bimetallic component 3, thereby ensuring the normal operation of the adjustment process.

[0072] Molded case circuit breakers include not only single-phase molded case circuit breakers, but also two-phase, three-phase, and four-phase molded case circuit breakers. Correspondingly, in a two-phase molded case circuit breaker, there are two bimetallic assemblies 3, positioned on one side of the traction rod 2. In a three-phase molded case circuit breaker, there are three bimetallic assemblies 3, positioned on one side of the traction rod 2. In a four-phase molded case circuit breaker, there are three or four bimetallic assemblies 3, positioned on one side of the traction rod 2. When adjusting the overload characteristics of the molded case circuit breaker, the gap between each bimetallic assembly 3 and the traction rod 2 needs to be adjusted.

[0073] Based on this, please refer to Figures 4 to 6 ,in Figure 6 This is a schematic diagram illustrating the structure of a clamp and a bimetallic component and traction rod assembly in a multiphase molded case circuit breaker, as provided in an embodiment of this application. In one embodiment of this application, the number of plug-in portions 132 is n, and the n plug-in portions 132 are arranged along a third direction D3, where n is 2, 3, or 4. The third direction D3 is perpendicular to the first direction D1 and the second direction D2. The plug-in slot 113 includes a plurality of plug-in sub-slots 1131 corresponding one-to-one with the plurality of plug-in portions 132. The second positioning plate 13 is plugged into and connected to the base plate 11 through the plurality of plug-in sub-slots 1131.

[0074] Specifically, with Figure 6 Taking the structure shown as an example, Figure 6 In the structure shown, the molded case circuit breaker includes three bimetallic components 3. When adjusting the overload characteristics of this molded case circuit breaker, a clamp 1 with three plug-in parts 132 can be selected. After the clamp 1 is positioned with the traction rod 2 in the molded case circuit breaker, each plug-in part 132 can be directly aligned with a bimetallic component 3 in the second direction D2. In this way, the positions of three different bimetallic components 3 in the molded case circuit breaker can be adjusted at one time using the same clamp 1, which helps to improve the adjustment efficiency.

[0075] Furthermore, in this embodiment, there are multiple insertion parts 132. When the clamp 1 is applied, each insertion part 132 can correspond to a bimetallic component 3. This can reduce the influence between the bimetallic components 3 when adjusting their positions, thereby improving the accuracy of the clamp 1 in calibrating the position of the bimetallic component 3.

[0076] Please combine Figures 4 to 6 In one embodiment of this application, a handle 14 is also provided on the top surface 111. This facilitates the operator in picking up and placing the clamp 1. On the other hand, the operator can apply external force to the clamp 1 through the handle 14, thereby enabling the clamp 1 to be accurately positioned with the traction rod 2, thus calibrating the position of the clamp 1 on the bimetallic component 3.

[0077] Please continue to refer to this. Figures 4 to 6 In some embodiments of this application, the second positioning plate 13 is further provided with a second clearance groove 134 for avoiding the handle 14.

[0078] Specifically, the handle 14 occupies a portion of the area of ​​the top surface 111 of the base plate 11. By providing a second clearance groove 134 on the second positioning plate 13, the installation between the second positioning plate 13 and the base plate 11 can be freed from the influence of the handle 14, the area of ​​the top surface 111 of the base plate 11 can be more fully utilized, and the structure of the clamp 1 is more compact.

[0079] Please continue to refer to this. Figure 1 The clamp provided in this application is used to adjust the gap between the bimetallic assembly and the traction rod. During the adjustment process, deformation of the clamp itself is undesirable as it would affect the accuracy of the gap adjustment. Therefore, the clamp material is required to have good rigidity. In one embodiment of this application, the base plate, the first positioning plate, and the second positioning plate are made of alloy tool steel.

[0080] Alloy tool steel is characterized by high hardness and good wear resistance. The base plate, first positioning plate and second positioning plate are made of alloy tool steel, which has the characteristics of good rigidity and high hardness, and is not easy to deform, thus ensuring the accuracy of gap adjustment.

[0081] For example, in some embodiments of this application, the alloy tool steel may be Cr12MoV, S136, etc.

[0082] Those skilled in the art will understand that although some embodiments herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of this application and form different embodiments. For example, in the claims, any of the claimed embodiments can be used in any combination.

[0083] The above-described embodiments are merely illustrative of the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to depart from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A fixture for verifying the overload characteristics of a molded case circuit breaker, characterized in that, Includes a base plate, a first positioning plate, and a second positioning plate; Along the first direction, the base plate includes a top surface and a bottom surface that are positioned opposite each other. The bottom surface is used to contact the traction rod of the molded case circuit breaker to achieve positioning of the base plate and the traction rod in the first direction. The first positioning plate and the second positioning plate are arranged side by side along the second direction and are both connected to the base plate. The space enclosed by the three plates can accommodate the traction rod. The surface of the first positioning plate near the second positioning plate is used to contact the surface of the traction rod away from the bimetallic component in the second direction, thereby positioning the base plate and the traction rod in the second direction. The surface of the second positioning plate away from the first positioning plate is the contact positioning surface of the bimetallic component in the second direction. The second direction is perpendicular to the first direction.

2. The fixture for verifying the overload characteristics of a molded case circuit breaker according to claim 1, characterized in that, The first positioning plate and the base plate are an integral structure.

3. The fixture for verifying the overload characteristics of a molded case circuit breaker according to claim 2, characterized in that, The surface of the traction rod away from the bimetallic component in the second direction includes a first surface and a second surface, wherein the first surface is a plane; the first surface and the second surface are arranged side by side along a third direction and are located in different planes; Along the third direction, the first positioning plate includes at least one positioning sub-plate and a first clearance groove. The surface of the positioning sub-plate near the second positioning plate is used to contact and position with the first surface, and the first clearance groove is used to avoid the second surface. The third direction is perpendicular to the first direction and the second direction.

4. The fixture for verifying the overload characteristics of a molded case circuit breaker according to any one of claims 1 to 3, characterized in that, The second positioning plate and the base plate are an integral structure.

5. The fixture for verifying the overload characteristics of a molded case circuit breaker according to any one of claims 1 to 3, characterized in that, The base plate also includes multiple insertion slots. Along the first direction, the insertion slots penetrate the base plate. Along the second direction, the multiple insertion slots are arranged side by side. The second positioning plate can be inserted and connected to the base plate through any one of the insertion slots.

6. The fixture for verifying the overload characteristics of a molded case circuit breaker according to claim 5, characterized in that, The second positioning plate includes an integral body and a plug-in part, and a second positioning surface is formed between the plug-in part and the body part along the first direction; After the second positioning plate is inserted into the base plate, the main body is located on one side of the top surface of the base plate, the second positioning surface is in contact with the top surface, at least a portion of the insertion part is located on one side of the bottom surface, and the surface of the insertion part away from the first positioning plate is the contact positioning surface of the bimetallic assembly.

7. The fixture for verifying the overload characteristics of a molded case circuit breaker according to claim 6, characterized in that, The number of the plug-in parts is n, and the n plug-in parts are arranged along a third direction, where n is 2, 3 or 4, and the third direction is perpendicular to the first direction and the second direction; The insertion slot includes multiple insertion sub-slots that correspond one-to-one with the multiple insertion parts, and the second positioning plate is inserted and connected to the base plate through the multiple insertion sub-slots.

8. The fixture for verifying the overload characteristics of a molded case circuit breaker according to claim 5, characterized in that, The top surface is also equipped with a handle.

9. The fixture for verifying the overload characteristics of a molded case circuit breaker according to claim 8, characterized in that, The second positioning plate is also provided with a second clearance groove for avoiding the handle.

10. The fixture for verifying the overload characteristics of a molded case circuit breaker according to any one of claims 1 to 3, characterized in that, The base plate, the first positioning plate, and the second positioning plate are made of alloy tool steel.

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