A trip buckle for a molded case circuit breaker

Abstract

The application relates to the technical field of snap buckles, and discloses a snap buckle of a molded case circuit breaker, which comprises a rotating shaft piece and a matching part, the matching part is provided with two groups and is symmetrically arranged at the front and back ends of the rotating shaft piece, and the rotating shaft piece comprises a first connecting rod. The snap buckle of the molded case circuit breaker is provided with a rotating ball, an extension rod, a sliding groove and a sliding block, the rolling friction coefficient of the rotating ball is far lower than the sliding friction coefficient of the inclined surface, the resistance is smaller when the clamping column is inserted into the clamping groove, the operation feels more convenient, the snap buckle is especially suitable for frequent disassembly scenes (such as replacement of the limiting block), meanwhile, material abrasion is reduced, the service life is prolonged, the extension rod is additionally arranged in the spring, the axial movement of the spring is forcedly restricted, the clamping column is ensured to always move along a straight line, reset failure caused by spring distortion is avoided, the action reliability of the clamping column is improved, the sliding block is automatically slid into the sliding groove during installation, the angle between the matching part and the rotating shaft piece is forcedly aligned, and misalignment is avoided.

Description

Technical Field

[0001] This application relates to the field of tripping technology, specifically a tripping mechanism for a molded case circuit breaker. Background Technology

[0002] A trip button, located inside a circuit breaker, is used to control the connection and disconnection of the circuit within the circuit breaker.

[0003] An existing patent (publication number: CN219418936U) discloses a trip button for a molded case circuit breaker, including a rotating shaft and a trip plate. The outer wall of the rotating shaft has axially extending connecting teeth, and the trip plate has connecting holes that mate with the connecting teeth. The inner wall of the connecting holes has mating teeth that mate with the connecting teeth. The rotating shaft includes a snap-fit ​​portion and a mating portion. The mating portion is located on both sides of the snap-fit ​​portion. The snap-fit ​​portion includes a first connecting rod, with connecting teeth disposed on the first connecting rod. Snap-fit ​​grooves are formed on both sides of the first connecting rod, and snap-fit ​​holes communicating with the snap-fit ​​grooves are also formed on the first connecting rod, located on both sides of the connecting teeth. The mating portion includes a second connecting rod and a limiting block disposed at one end of the second connecting rod. The other end of the second connecting rod has a snap-fit ​​post that mates with the snap-fit ​​groove, and the snap-fit ​​post has a limiting element for limiting the mating portion. This application allows for easy replacement of the limiting block; if the limiting block is damaged, it can be disassembled and replaced, reducing replacement costs.

[0004] Although the device in the aforementioned comparative document allows for the removal and replacement of the limiting block, reducing replacement costs, the sliding friction between the inclined surface of the locking block and the locking hole in the aforementioned device is prone to wear. After long-term use, it is prone to jamming. Furthermore, the locking pin relies solely on the clearance fit of the locking groove, which can easily lead to misalignment between the mating part and the locking part due to assembly errors or external impacts. The original return spring is prone to lateral bending during compression / extension, causing the locking pin's movement trajectory to deviate or even jam. Therefore, a tripping clip for a molded case circuit breaker is provided. Utility Model Content

[0005] To address the shortcomings of existing technologies, this application provides a tripping clip for a molded case circuit breaker, which reduces material wear, extends service life, ensures that the locking block always moves in a straight line, avoids reset failure caused by spring torsion, and forcibly aligns the angle between the mating part and the locking part to prevent misalignment.

[0006] To achieve the above objectives, this application provides the following technical solution: a trip button for a molded case circuit breaker, comprising a rotating shaft and a mating part, wherein the mating part is provided in two sets and symmetrically arranged at the front and rear ends of the rotating shaft, the rotating shaft includes a first connecting rod, the first connecting rod having a snap-fit ​​groove on its side, and a sliding groove having a sliding groove inside the snap-fit ​​groove, the sliding groove having two sets and symmetrically arranged inside the snap-fit ​​groove, the first connecting rod having a snap-fit ​​hole on its upper surface, the mating part including a second connecting rod, the second connecting rod having a limit block on the side away from the rotating shaft and a snap-fit ​​post on the side of the second connecting rod closer to the rotating shaft, and so on. The snap-fit ​​post is inserted into the snap-fit ​​groove. An installation hole is formed inside the snap-fit ​​post, and a fixing plate is fixedly connected inside the installation hole. A telescopic rod and a spring are fixedly connected to the upper surface of the fixing plate. A receiving groove is formed on the upper surface of the snap-fit ​​post. The receiving groove and the snap-fit ​​hole are vertically aligned and have the same dimensions. The telescopic rod and the spring are inserted into the receiving groove. A ball seat is fixedly connected to the upper end of the telescopic rod and the spring. The ball seat is movably connected to the receiving groove and the snap-fit ​​hole. A rotating ball is rotatably connected to the upper surface of the ball seat. Slider blocks are fixedly connected to both sides of the snap-fit ​​post, and the sliders are movably connected inside the sliding groove.

[0007] The above solution, by setting up a rotating ball, telescopic rod, slide groove, and slider, achieves a rolling friction coefficient of the rotating ball that is much lower than that of the inclined plane sliding friction. This reduces resistance when the locking pin is inserted into the locking groove, making operation easier and more suitable for frequent disassembly scenarios (such as replacement of limit blocks). It also reduces material wear and extends service life. The addition of a telescopic rod inside the spring forcibly constrains the axial movement of the spring, ensuring that the locking pin always moves in a straight line, avoiding reset failure caused by spring torsion, and improving the reliability of the locking pin's action. During installation, the slider automatically slides into the slide groove, forcibly aligning the mating part with the angle of the rotating shaft, preventing misalignment.

[0008] Furthermore, the first connecting rod surface is provided with connecting teeth, the rotating shaft surface is provided with a buckle plate, the buckle plate includes a connecting plate, the connecting plate is provided with a connecting hole that mates with the connecting teeth, and the connecting plate is interference-fitted to the connecting teeth through the connecting hole.

[0009] The above solution provides axial tensile and radial torsional resistance, ensuring no relative displacement between the buckle plate and the pivot during buckle operation. The buckle plate is installed in one step through riveting, eliminating the need for bolts or welding and reducing production costs.

[0010] Furthermore, the connecting hole is provided with mating teeth that cooperate with the connecting teeth.

[0011] Through the above scheme, the toothed meshing distributes the force of the buckle to the multi-tooth contact surface, avoiding single tooth overload breakage. The interlocking of the mating teeth and connecting teeth prevents the rotating shaft from rotating circumferentially during operation.

[0012] Furthermore, a positioning ring is provided on the outer wall of the connecting tooth, one side of the positioning ring is aligned with one side wall of the connecting tooth, and the positioning ring abuts against one side of the connecting plate.

[0013] The above solution involves setting a positioning ring on the outer wall of the connecting teeth, which abuts against the side wall of the buckle plate for limiting the position. The positioning ring acts as a mechanical stop to ensure the accurate installation depth of the buckle plate and prevent deformation caused by excessive pressure.

[0014] Furthermore, a positioning groove is provided on the inner wall of the connecting hole, and a positioning post that cooperates with the positioning groove is provided on the side wall of the connecting tooth.

[0015] The above method ensures that the positioning post and positioning groove are forcibly connected, guaranteeing the uniqueness of the installation angle between the buckle plate and the rotating shaft.

[0016] Furthermore, the spring is made of high-carbon steel.

[0017] Through the above solution, high-carbon steel provides excellent elastic recovery, ensuring that the ball seat can reliably rebound after multiple disassemblies.

[0018] Furthermore, the rotating ball is made of bearing steel.

[0019] The above method significantly reduces the frictional loss between the rotating ball and the snap-fit ​​hole by increasing the hardness of the bearing steel (HRC 58-62).

[0020] Furthermore, when the ball seat retracts into the receiving groove, it is rolled into the snap-fit ​​groove.

[0021] The above solution avoids scratches on the inner wall of the locking groove by rolling contact, thus maintaining long-term fitting accuracy.

[0022] Compared with the prior art, the technical solution of this application has the following beneficial effects: This type of trip button for a molded case circuit breaker features a rotating ball, telescopic rod, sliding groove, and slider. The rolling friction coefficient of the rotating ball is much lower than that of the sliding friction on the inclined plane, resulting in less resistance when the locking pin is inserted into the locking groove and a smoother operation. This is especially suitable for scenarios requiring frequent disassembly (such as replacing limit blocks). It also reduces material wear and extends service life. The telescopic rod inside the spring forcibly constrains the axial movement of the spring, ensuring that the locking pin always moves in a straight line, avoiding reset failure due to spring torsion, and improving the reliability of the locking pin's operation. During installation, the slider automatically slides into the sliding groove, forcibly aligning the mating part with the angle of the rotating shaft to prevent misalignment. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the disassembled structure of this application; Figure 2 This is a three-dimensional structural diagram of the present application. Figure 3This is a cross-sectional structural schematic diagram of the rotating shaft component of this application; Figure 4 This is a cross-sectional structural diagram of the mating part of this application; Figure 5 This is a three-dimensional enlarged structural diagram of the buckle plate in this application.

[0024] In the picture: 1. Rotating shaft; 101. First connecting rod; 102. Snap-fit ​​groove; 103. Slide groove; 104. Snap-fit ​​hole; 105. Connecting tooth; 106. Positioning ring; 107. Positioning post; 2. Mating part; 201. Second connecting rod; 202. Limiting block; 203. Snap-fit ​​post; 204. Mounting hole; 205. Fixing plate; 206. Spring; 207. Telescopic rod; 208. Ball seat; 209. Rotating ball; 210. Receiving groove; 211. Slider; 3. Buckle plate; 301. Connecting plate; 302. Connecting hole; 303. Mating tooth; 304. Positioning groove. Detailed Implementation

[0025] 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, and 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.

[0026] Please see Figure 1 , Figure 3 and Figure 4The trip button of a molded case circuit breaker in this embodiment includes a rotating shaft 1 and a mating part 2. The mating part 2 has two sets symmetrically arranged at the front and rear ends of the rotating shaft 1. The rotating shaft 1 includes a first connecting rod 101, with a snap-fit ​​groove 102 on its side. Two sets of sliding grooves 103 are symmetrically arranged inside the snap-fit ​​groove 102. A snap-fit ​​hole 104 is formed on the upper surface of the first connecting rod 101. The mating part 2 includes a second connecting rod 201, which is located away from the rotating shaft. A limit block 202 is provided on one side of the second connecting rod 201 near the rotating shaft 1. A locking post 203 is provided on the side of the second connecting rod 201. The locking post 203 passes through the locking groove 102. An installation hole 204 is opened inside the locking post 203. A fixing plate 205 is fixedly connected inside the installation hole 204. A telescopic rod 207 and a spring 206 are fixedly connected to the upper surface of the fixing plate 205. A receiving groove 210 is opened on the upper surface of the locking post 203. The receiving groove 210 and the locking hole 104 are vertically corresponding and have the same size. The telescopic rod 207 and the spring 206 pass through the receiving groove 210. Inside the receiving groove 210, a ball seat 208 is fixedly connected to the upper end of the telescopic rod 207 and the spring 206. The ball seat 208 is movably connected inside the receiving groove 210 and the snap-fit ​​hole 104. A rotating ball 209 is rotatably connected to the upper surface of the ball seat 208. Slider 211 is fixedly connected to both sides of the snap-fit ​​post 203. The slider 211 is movably connected inside the slide groove 103. By setting the rotating ball 209, telescopic rod 207, slide groove 103 and slider 211, the rolling friction coefficient of the rotating ball 209 is much lower than the sliding friction of the inclined plane, so that the snap-fit ​​post 206... 3. When inserting into the snap-fit ​​slot 102, the resistance is smaller and the operation is easier, which is especially suitable for frequent disassembly scenarios (such as the replacement of the limit block 202). At the same time, it reduces material wear and extends service life. A telescopic rod 207 is added inside the spring 206 to forcibly constrain the axial movement of the spring 206, ensuring that the snap-fit ​​post 203 always moves in a straight line, avoiding reset failure caused by the twisting of the spring 206, and improving the reliability of the snap-fit ​​post 203. During installation, the slider 211 automatically slides into the slide groove 103, forcibly aligning the angle between the mating part 2 and the rotating shaft 1 to avoid misalignment.

[0027] Please see Figure 1 , Figure 3 and Figure 4The first connecting rod 101 has connecting teeth 105 on its surface, and the rotating shaft 1 has a buckle plate 3 on its surface. The buckle plate 3 includes a connecting plate 301, which has a connecting hole 302 that mates with the connecting teeth 105. The connecting plate 301 is interference-fitted to the connecting teeth 105 through the connecting hole 302. The connecting hole 302 has a mating tooth 303 that mates with the connecting teeth 105. The outer wall of the connecting teeth 105 has a positioning ring 106, one side of which is aligned with one side wall of the connecting teeth 105. The positioning ring 106 and one side of the connecting plate 301 abut against each other, forming an interference fit. The system provides axial tensile and radial torsional resistance to ensure no relative displacement between the buckle plate 3 and the rotating shaft 1 during the buckle's operation. The buckle plate is installed in one step through a riveting process, eliminating the need for bolts or welding, thus reducing production costs. The toothed meshing distributes the buckle's force to multiple tooth contact surfaces, preventing single tooth breakage due to overload. The interlocking teeth 303 and connecting teeth 105 prevent the rotating shaft 1 from rotating circumferentially during operation. A positioning ring 106 is provided on the outer wall of the connecting teeth 105, which abuts against and limits the buckle plate 3's side wall. The positioning ring 106 acts as a mechanical stop to ensure accurate installation depth of the buckle plate 3 and prevent deformation caused by overpressure.

[0028] Please see Figure 1 , Figure 3 and Figure 4 A positioning groove 304 is provided on the inner wall of the connecting hole 302, and a positioning post 107 that mates with the positioning groove 304 is provided on the side wall of the connecting tooth 105. The spring 206 is made of high carbon steel, and the rotating ball 209 is made of bearing steel. When the ball seat 208 is retracted into the receiving groove 210, it is rolled and connected to the snap-fit ​​groove 102. The positioning post 107 is forcibly inserted into the positioning groove 304 to ensure the uniqueness of the installation angle of the buckle plate 3 and the rotating shaft 1. The high carbon steel provides excellent elastic recovery force to ensure that the ball seat 208 can still reliably rebound after multiple disassemblies. The hardness of the bearing steel (HRC 58-62) significantly reduces the frictional loss between the rotating ball 209 and the snap-fit ​​hole 104. The rolling contact avoids scratches on the inner wall of the snap-fit ​​groove 102 and maintains long-term fitting accuracy.

[0029] In this embodiment, by setting a rotating ball 209, a telescopic rod 207, a sliding groove 103, and a slider 211, the rolling friction coefficient of the rotating ball 209 is much lower than that of the inclined plane sliding friction, so that the resistance is smaller when the locking post 203 is inserted into the locking groove 102, and the operation is easier, especially suitable for frequent disassembly scenarios (such as the replacement of the limit block 202). At the same time, it reduces material wear and extends service life. The telescopic rod 207 is added inside the spring 206 to forcibly constrain the axial movement of the spring 206, ensuring that the locking post 203 always moves in a straight line, avoiding reset failure caused by the torsion of the spring 206, and improving the reliability of the locking post 203. During installation, the slider 211 automatically slides into the sliding groove 103, forcibly aligning the angle between the mating part 2 and the rotating shaft 1 to avoid misalignment.

[0030] The working principle of the above embodiment is as follows: When installing the limiting block 202, the locking post 203 of the mating part 2 is aligned with the locking groove 102 of the rotating shaft part 1, and the sliders 211 on both sides slide along the groove 103 to ensure that the locking post 203 is inserted in a straight line and to prevent deflection. During the insertion of the locking post 203, the rotating ball 209 contacts the inner wall of the locking groove 102, pushing the ball seat 208 down. The spring 206 and the telescopic rod 207 are compressed synchronously, and the ball seat 208 is temporarily retracted into the receiving groove 210. When the locking post 203 is fully inserted, the receiving groove 210 aligns with the locking hole 104, the spring 206 releases pressure, pushing the ball seat 208 upward, and the rotating ball 209 embeds into the locking hole 104, forming a mechanical interlock. The mating part 2 is rigidly fixed to the rotating shaft 1. The two sets of mating parts 2 are symmetrically distributed at both ends of the rotating shaft 1. When the limiting block 202 contacts the internal mechanism of the circuit breaker, the load is evenly transmitted to the rotating shaft 1 through the slider 211 and the slide groove 103, avoiding stress concentration on one side. The sliding engagement between slider 211 and slide groove 103 restricts the circumferential displacement of locking post 203. The spherical contact between rotating ball 209 and locking hole 104 allows for small-angle adaptive adjustment, improving the flexibility of the snap-fit ​​action. During disassembly and replacement, external force presses on rotating ball 209, causing ball seat 208 to move down and compress spring 206. Rotating ball 209 exits locking hole 104 and slides in the opposite direction along slide groove 103, causing locking post 203 to slide back along slide groove 103. The mating part 2 separates from the rotating shaft 1, and the limiting block 202... It can be replaced individually. The high-carbon steel spring 206 provides stable elastic force, and the bearing steel rotating ball 209 reduces friction loss and ensures the reliability of repeated disassembly. The connecting teeth 105 of the rotating shaft 1 and the mating teeth 303 of the buckle plate 3 are interference-engaged. The deformable material after riveting fills the ring groove 106 to form an anti-rotation solid. The insertion of the positioning post 107 and the positioning groove 304 ensures the uniqueness of the installation angle of the rotating shaft 1. The positioning ring 106 abuts against the side wall of the connecting plate 301 to limit the axial displacement of the buckle plate 3.

[0031] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0032] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A tripping clip for a molded case circuit breaker, comprising a rotating shaft (1) and a mating part (2), characterized in that: The mating part (2) is provided in two sets and is symmetrically arranged at the front and rear ends of the rotating shaft (1). The rotating shaft (1) includes a first connecting rod (101). The first connecting rod (101) has a snap-fit ​​groove (102) on its side. The snap-fit ​​groove (102) has a sliding groove (103) inside. There are two sets of sliding grooves (103) and they are symmetrically arranged inside the snap-fit ​​groove (102). The first connecting rod (101) has a snap-fit ​​hole (104) on its upper surface. The mating part (2) includes a second connecting rod (201). The second connecting rod (201) has a limit block (202) on the side away from the rotating shaft (1). The second connecting rod (201) has a snap-fit ​​post (203) on the side close to the rotating shaft (1). The snap-fit ​​post (203) passes through the snap-fit ​​groove (102). The snap-fit ​​post (203) has an installation hole (204) inside. A fixing plate (205) is fixedly connected inside the mounting hole (204). A telescopic rod (207) and a spring (206) are fixedly connected to the upper surface of the fixing plate (205). A receiving groove (210) is opened on the upper surface of the snap-fit ​​post (203). The receiving groove (210) and the snap-fit ​​hole (104) are vertically corresponding and have the same size. The telescopic rod (207) and the spring (206) pass through the receiving groove (210). A ball seat (208) is fixedly connected to the upper end of the telescopic rod (207) and the spring (206). The ball seat (208) is movably connected inside the receiving groove (210) and the snap-fit ​​hole (104). A rotating ball (209) is rotatably connected to the upper surface of the ball seat (208). A slider (211) is fixedly connected to both the left and right sides of the snap-fit ​​post (203). The slider (211) is movably connected inside the sliding groove (103).

2. The tripping mechanism of a molded case circuit breaker according to claim 1, characterized in that: The first connecting rod (101) has connecting teeth (105) on its surface, and the rotating shaft (1) has a buckle plate (3) on its surface. The buckle plate (3) includes a connecting plate (301). The connecting plate (301) has a connecting hole (302) that mates with the connecting teeth (105). The connecting plate (301) is interference-fitted to the connecting teeth (105) through the connecting hole (302).

3. The tripping mechanism of a molded case circuit breaker according to claim 2, characterized in that: The connecting hole (302) is provided with a mating tooth (303) that mates with the connecting tooth (105).

4. The tripping mechanism of a molded case circuit breaker according to claim 3, characterized in that: A positioning ring (106) is provided on the outer wall of the connecting tooth (105). One side of the positioning ring (106) is aligned with one side wall of the connecting tooth (105), and the positioning ring (106) abuts against one side of the connecting plate (301).

5. The tripping mechanism of a molded case circuit breaker according to claim 4, characterized in that: The inner wall of the connecting hole (302) is provided with a positioning groove (304), and the side wall of the connecting tooth (105) is provided with a positioning post (107) that cooperates with the positioning groove (304).

6. The tripping mechanism of a molded case circuit breaker according to claim 1, characterized in that: The spring (206) is made of high carbon steel.

7. The tripping mechanism of a molded case circuit breaker according to claim 1, characterized in that: The rotating ball (209) is made of bearing steel.

8. The tripping mechanism of a molded case circuit breaker according to claim 1, characterized in that: When the ball seat (208) retracts into the receiving groove (210), it is rolled into the snap-fit ​​groove (102).

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