A fuse terminal, replacement method and assembly method

Abstract

This invention relates to the field of terminal block technology, specifically to a fusible terminal block, a replacement method, and an assembly method. It includes a main body and a detachable fusible assembly inserted into the main body. The fusible assembly includes a plug-in bracket and a detachable fusible core. A limiting member is fixedly installed on the plug-in bracket, located below the fusible core. A fixed bracket is fixedly installed inside the main body, and a locking component is installed on the fixed bracket. The locking component includes a locking member rotatably mounted on the fixed bracket. A return spring is installed between the locking member and the inner wall of the main body or between the locking member and the fixed bracket. A locking tongue is fixedly installed on the locking member, used to press against the upper side of the limiting member to prevent the fusible assembly from being pulled out of the main body. This invention, while ensuring convenient replacement of the fusible core, effectively prevents the fusible assembly from accidentally detaching from the main body during normal operation due to accidental contact, thereby improving the safety and reliability of equipment operation.

Description

Technical Field

[0001] This invention relates to the field of terminal block technology, and specifically to a fusible terminal block, a replacement method, and an assembly method. Background Technology

[0002] Existing fusible terminal blocks have conductive connecting bars at both ends inside the housing. These connecting bars have snap-fit ​​recesses for electrically connecting the fuse. A quick-replaceable fuse assembly is located on the upper part of the housing. The fuse assembly includes a fuse carrier base and a fuse connected within the fuse carrier base. The fuse can be disconnected from the snap-fit ​​recess by removing the fuse carrier base. This existing fuse assembly structure is designed for easy replacement of the fuse core after the fuse in the fusible terminal block has blown.

[0003] Although this type of fuse terminal block allows for quick replacement of the fuse core, the fuse assembly is usually removed from the top of the housing. During normal operation, accidental contact or misoperation can easily separate the fuse assembly from the housing, causing an interruption of the power circuit, affecting equipment operation, and in severe cases, even leading to a safety accident. Furthermore, at this time, the circuit current of the fuse terminal block may be far below the fusing value, but at the moment of conductor separation, a strong electric arc will form between the contacts. This high-temperature arc can not only burn the internal conductive busbars and retaining springs of the terminal block, causing permanent damage to the contact surface, but may also splash inside the confined housing, causing phase-to-phase or inter-pole short circuits, directly burning out the upstream switch or causing a fire.

[0004] In view of this, there is an urgent need to design a new type of fusible terminal block to solve the defects of existing fusible terminal blocks in practical use. Summary of the Invention

[0005] To address the technical problem of accidental separation of the fuse assembly from the housing during normal operation of a fusible terminal block, this invention provides a fusible terminal block, a replacement method, and an assembly method. This method effectively prevents the fuse assembly from accidentally detaching from the main body due to accidental contact during normal operation, while ensuring convenient replacement of the fuse element inside the fuse. This improves the safety and reliability of equipment operation.

[0006] In a first aspect of the invention, a fusible terminal block is provided, comprising a main body and a detachable fusible assembly inserted into the main body. The main body is provided with a first wiring portion and a second wiring portion. The fusible assembly includes a plug-in bracket and a detachable fusible core thereon. One end of the fusible core is electrically connected to the first wiring portion via a first conductor, and the other end of the fusible core is electrically connected to the second wiring portion via a second conductor. A limiting member is fixedly provided on the plug-in bracket, and the limiting member is located below the fusible core. A fixing bracket is fixedly provided inside the main body, and a locking assembly is provided on the fixing bracket. The locking assembly includes a locking member, which is rotatably disposed on the fixing bracket. A return spring is provided between the locking member and the inner wall of the main body or between the fixing bracket, and the return spring is used to give the locking member a tendency to swing toward the side where the limiting member is located. A locking tongue is fixedly provided on the locking member, and the locking tongue is used to press against the upper side of the limiting member to prevent the fusible assembly from being pulled out of the main body.

[0007] Optionally, the locking assembly further includes a latch, the latch tongue having an opening groove, the latch being rotatably disposed within the opening groove, the latch being fixedly provided with a snap-fit ​​end, the snap-fit ​​end being used to snap with the limiting member to restrict the rotation of the locking member; a torsion spring is provided between the latch and the locking member, the torsion spring being used to give the snap-fit ​​end a tendency to rotate toward the limiting member.

[0008] Optionally, the fastening end is provided with a guide surface on the side opposite to the limiting member, and the guide surface is used to abut against the limiting member.

[0009] Optionally, the opening groove divides the latch into a first tongue and a second tongue, and a blocking member is provided between the first tongue and the second tongue. The blocking member is used to restrict the unidirectional rotation stroke of the latch.

[0010] Optionally, a first pressing part is provided on one end of the locking member opposite to the fastening end.

[0011] Optionally, a cover plate is provided on one side of the main body, and the cover plate is provided with a clearance hole, which is used to provide movement space for the locking component.

[0012] Optionally, a second pressing part is provided on the locking member at the end opposite to the locking tongue.

[0013] Optionally, a limiting surface is provided at one end of the second pressing part away from the locking tongue. The limiting surface is inclined relative to the locking member and is used to abut against the cover plate to constrain the travel of the locking member to the side away from the main body.

[0014] Optionally, the edge of the clearance hole is provided with a first flange, and the side of the main body away from the clearance hole is provided with a second flange. When adjacent fuse terminals are spliced, the adjacent first flange and second flange are spliced ​​together to form a storage space.

[0015] Optionally, it also includes a pressure plate assembly, which includes a flip bracket and a pressure plate. One end of the flip bracket is hinged to the second flange, and the pressure plate is fixedly disposed at the other end of the flip bracket. When the flip bracket is flipped to a vertical position, the pressure plate presses against the top of the plug-in bracket.

[0016] Optionally, the pressure plate is provided with a first suction part, and the top of the plug-in bracket is provided with a second suction part, wherein the first suction part and the second suction part are magnetically attracted to each other.

[0017] Optionally, the top of the main body is provided with a lamp hole, the top of the lamp hole is provided with a viewing window, and an LED lamp bead is provided inside the lamp hole. The LED lamp bead includes a first pin and a second pin. A PCB board is provided inside the main body. The PCB board is electrically connected to the first conductor, and the first pin is electrically connected to the PCB board. The main body is also provided with a first contact and a second contact electrically connected by an internal wire. The second pin is electrically connected to the first contact, and the second contact is electrically connected to the second conductor.

[0018] In a second aspect of the invention, a replacement method is provided for the aforementioned fusible terminal block, comprising: rotating a flip bracket away from the main body to move a pressure plate away from the plug-in bracket; rotating a locking member to move the latching end away from the limiting member, while simultaneously rotating a locking member to move the locking tongue away from the limiting member; rotating or removing the plug-in bracket and replacing the fusible core thereon, and then re-inserting the fusible assembly into the main body, ensuring that one end of the fusible core is electrically connected to the first terminal part through a first conductor, and the other end of the fusible core is electrically connected to the second terminal part through a second conductor; the locking assembly naturally resets under the action of a return spring and a torsion spring, ensuring that the locking tongue is pressed against the upper side of the limiting member, and that the latching end is latched against the limiting member; and rotating the flip bracket to press the pressure plate against the top of the plug-in bracket.

[0019] In a third aspect of the invention, an assembly method is provided for assembling the aforementioned fusible terminal block, comprising: assembling a second engaging portion and a fusible core on a plug-in bracket to form a fusible assembly; inserting the fusible assembly into a main body; hingedly providing a locking member and a torsion spring on a locking member to form a locking assembly; hingedly providing a locking member on a fixed bracket to connect the locking assembly to the fixed bracket; providing a return spring between the locking member and the inner wall of the main body or between the fixed brackets to ensure that the locking tongue presses against the upper side of the limiting member, and that the latching end latches against the limiting member; fixing a flip bracket and a pressure plate together to form a pressure plate assembly; hinged the flip bracket to the main body to ensure that the first engaging portion and the second engaging portion magnetically engage.

[0020] Compared with the prior art, the technical solution provided by this invention has the following advantages: Addressing the technical problem of accidental separation of the fuse assembly from the housing during normal operation of a fusible terminal block, this invention effectively prevents the fuse assembly from accidentally detaching from the main body due to misoperation by locking the assembly, while ensuring convenient replacement of the fuse core. This improves the safety and reliability of equipment operation. Specific effects will be described in the following embodiments. Attached Figure Description

[0021] Figure 1 This is one of the structural schematic diagrams of the fusible terminal block proposed in the embodiments of the present invention.

[0022] Figure 2 This is the second schematic diagram of the structure of the fusible terminal block proposed in the embodiment of the present invention.

[0023] Figure 3 This is the third schematic diagram of the structure of the fusible terminal block proposed in the embodiment of the present invention.

[0024] Figure 4 This is a schematic diagram of the structure of the fuse assembly proposed in an embodiment of the present invention.

[0025] Figure 5 This is one of the structural schematic diagrams of the main body proposed in the embodiments of the present invention.

[0026] Figure 6 This is the second structural schematic diagram of the main body proposed in the embodiment of the present invention.

[0027] Figure 7 This is one of the structural schematic diagrams of the locking component proposed in an embodiment of the present invention.

[0028] Figure 8 This is the second schematic diagram of the locking component proposed in an embodiment of the present invention.

[0029] Figure 9 This is a schematic diagram of the locking component in a locked state according to an embodiment of the present invention.

[0030] Figure 10 This is a schematic diagram of the locking element in the unlocked state according to an embodiment of the present invention.

[0031] Figure 11 This is a schematic diagram of the locking component in the unlocked state according to an embodiment of the present invention.

[0032] Figure 12 This is a schematic diagram showing the state of the locking element and the limiting element when they abut against each other, as proposed in an embodiment of the present invention.

[0033] Figure 13This is a schematic diagram of the pressure plate assembly in the unlocked state according to an embodiment of the present invention.

[0034] Figure 14 This is a schematic diagram of the torsion spring proposed in an embodiment of the present invention.

[0035] Explanation of reference numerals in the attached drawings: 1. Main body; 10. Fixed bracket; 101. First wiring part; 102. Second wiring part; 103. Hinge part; 104. Bracket mounting part; 21. Insertion bracket; 210. Limiting element; 211. First conductor; 212. Second conductor; 22. Fusible core; 30. Locking element; 300. Locking tongue; 301. Opening groove; 302. Blocking element; 303. Second pressing part; 3031. Limiting surface; 304. Locking mounting part; 31. Return spring; 32. Locking fastener; 320. Snap-on end; 3201. Guide surface; 321. 1. First pressing part; 33. Locking pin; 34. Torsion spring; 341. First spring body; 342. Second spring body; 343. First connecting arm; 344. Second connecting arm; 345. First stop arm; 346. Second stop arm; 347. Bridging arm; 35. Locking pin; 4. Cover plate; 40. Clearance hole; 401. First flange; 402. Second flange; 50. Flip bracket; 51. Pressure plate; 511. First suction part; 512. Second suction part; 60. Lamp hole; 61. Viewing window; 62. PCB board; 631. First contact; 632. Second contact. Detailed Implementation

[0036] To further understand the content of this invention, a detailed description of the invention will be provided in conjunction with the accompanying drawings and embodiments.

[0037] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings. The terms "first," "second," etc., used in this invention are for the convenience of describing the technical solutions of the invention and have no specific limiting effect; they are all general terms and do not constitute a limitation on the technical solutions of the invention. It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other. In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, not to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Multiple technical solutions in the same embodiment, as well as multiple technical solutions in different embodiments, can be arranged and combined to form new technical solutions that do not contradict or conflict, all of which are within the scope of protection claimed by this invention.

[0038] Example 1

[0039] Combined with appendix Figure 1 To be continued Figure 14 This embodiment proposes a fusible terminal block, including a main body 1 and a detachable fusible assembly inserted into the main body 1. The main body 1 is provided with a first wiring portion 101 and a second wiring portion 102. The fusible assembly includes a plug-in bracket 21 and a detachable fuse core 22 thereon. One end of the fuse core 22 is electrically connected to the first wiring portion 101 through a first conductor 211, and the other end of the fuse core 22 is electrically connected to the second wiring portion 102 through a second conductor 212.

[0040] A limiting member 210 is fixedly installed on the insertion / removal bracket 21, located below the fusible core 22. A fixed bracket 10 is fixedly installed inside the main body 1, and a locking assembly is provided on the fixed bracket 10. The locking assembly includes a locking member 30, which is rotatably mounted on the fixed bracket 10. A return spring 31 is provided between the locking member 30 and the inner wall of the main body 1 or between the locking member 30 and the fixed bracket 10. The return spring 31 is used to make the locking member 30 tend to swing towards the side where the limiting member 210 is located. A locking tongue 300 is fixedly installed on the locking member 30, which is used to press against the upper side of the limiting member 210 to prevent the fusible assembly from being pulled out from the main body 1.

[0041] Specifically, the fixed bracket 10 includes an outwardly extending hinge portion 103, and the locking member 30 is rotatably connected to the hinge portion 103 of the fixed bracket 10 via a locking pin 33.

[0042] Specifically, the fixed bracket 10 is provided with a bracket mounting part 104, and the locking part 30 is provided with a locking mounting part 304 on the side near the fixed bracket 10. Both the bracket mounting part 104 and the locking mounting part 304 are provided with mounting holes. The two ends of the return spring 31 are respectively connected to the mounting holes of the bracket mounting part 104 and the locking mounting part 304.

[0043] For the fusible terminal block in this embodiment, during normal operation, as shown in the attached... Figure 9 As shown, the locking member 30 can keep the locking tongue 300 pressed against the limiting member 210 under the action of the return spring 31. Since the plug-in bracket 21 needs to move towards the top of the main body 1 to be removed, after the locking tongue 300 presses against the limiting member 210, the plug-in bracket 21 is difficult to pull out directly, thereby locking the plug-in bracket 21.

[0044] Obviously, because the return spring 31 has a tendency to swing the locking member 30 towards the side where the limiting member 210 is located, the pressing of the locking tongue 300 against the limiting member 210 is relatively more stable and less susceptible to external interference. Even if there is accidental contact or misoperation of the locking member 30, since the return spring 31 always has the elastic force to reset the locking member 30, the locking member 30 can still reset and press against the limiting member 210 after the accidental contact or misoperation ends. In other words, the normal operation of the fuse will only be truly affected when the locking member 30 is accidentally rotated and the plug-in bracket 21 is also accidentally pulled out, but the probability of both happening at the same time is extremely small.

[0045] Therefore, based on the design of the fuse-type terminal block in this embodiment, the fuse core 22 inside the fuse can be easily replaced, and the setting of the locking component can effectively prevent the fuse component from accidentally detaching from the main body 1 due to accidental contact during normal operation, thereby improving the safety and reliability of equipment operation.

[0046] The specific operation for replacing the fuse 22 is as follows: rotate the locking member 30 to move the locking tongue 300 away from the limiting member 210; rotate or pull out the plug-in bracket 21 and replace the fuse 22 on it; then reinsert the fuse assembly into the main body 1, ensuring that one end of the fuse 22 is electrically connected to the first wiring part 101 through the first conductor 211, and the other end of the fuse 22 is electrically connected to the second wiring part 102 through the second conductor 212; the locking assembly naturally resets under the action of the return spring 31, ensuring that the locking tongue 300 is pressed against the upper side of the limiting member 210, thereby completing the replacement of the fuse 22.

[0047] In a further embodiment, as shown in the appendix Figure 7 and attached Figure 8 As shown, the locking assembly also includes a latch 32. The latch 300 has an opening groove 301, and the latch 32 is rotatably disposed in the opening groove 301. The latch 32 is fixedly disposed on the latch 32, and the latching end 320 is used to latch with the limiting member 210 to limit the rotation of the locking member 30. Specifically, the latch 32 is rotatably connected to the opening groove 301 through a latch pin 35. A torsion spring 34 is disposed between the latch 32 and the locking member 30. The torsion spring 34 is used to make the latching end 320 tend to rotate toward the limiting member 210.

[0048] Therefore, based on the locking of the locking member 30 by pressing against the upper side of the limiting member 210 to prevent the fusible assembly from being pulled out of the main body 1, this embodiment further designs a locking member 32, as shown in the attached figure. Figure 9 The locking element 32 shown can hook onto the limiting element 210 to further restrict the swing of the locking element 30. Understandably, in this embodiment, the swing of the locking element 30 due to misoperation is also restrained, thereby eliminating the possibility of the fuse assembly accidentally detaching from the main body 1 under normal operating conditions, thus further improving the safety and reliability of equipment operation.

[0049] Further details are attached. Figure 7 and attached Figure 8 As shown, a guide surface 3201 is provided on the side of the latching end 320 facing away from the limiting member 210. The guide surface 3201 is used to abut against the limiting member 210. The guide surface 3201 can be a smoothly transitioned curved surface or an inclined surface. The purpose of the guide surface 3201 is that when the fusible assembly needs to be locked, the locking member 32 swings toward the limiting member 210 with the locking member 30 under the action of the return spring 31, and at the same time, the locking member 32 swings from top to bottom toward the limiting member 210 under the action of the torsion spring, as shown in the attached figure. Figure 12 As shown, if the guide surface 3201 abuts against the limiting member 210 at this time, the guide surface 3201 can guide the fastening end 320 to pass over the limiting member 210 and fasten with the limiting member 210, thereby improving the ease of operation.

[0050] And, in another embodiment, as shown in the appendix Figure 7 and attached Figure 8 As shown, the opening slot 301 divides the latch 300 into a first tongue and a second tongue. A blocking member 302 is provided between the first tongue and the second tongue. The blocking member 302 is used to restrict the one-way rotation stroke of the latch 32. Obviously, the latch 32 will swing from top to bottom towards the limiting member 210 under the action of the torsion spring. In order to prevent the latch 32 from rotating excessively, the blocking member 302 is provided. The blocking member 302 can abut against the latch 32 to prevent its rotation.

[0051] In a preferred embodiment, a first pressing part 321 is provided on the end of the locking member 32 facing away from the fastening end 320. By providing the first pressing part 321, it is convenient for the operator to operate the locking member 32 to rotate from the outside of the main body 1. That is, by pressing the first pressing part 321, the locking member 32 can be rotated counterclockwise to disengage from the limiting member 210, thereby improving the convenience of unlocking the locking component.

[0052] For details, see attached. Figure 7 Appendix Figure 8 and attached Figure 14 As shown, the torsion spring 34 includes a first spring body 341 and a second spring body 342. The inner end of the first spring body 341 is provided with a first connecting arm 343, and the inner end of the second spring body 342 is provided with a second connecting arm 344. A bridging arm 347 connects the first connecting arm 343 and the second connecting arm 344. The outer end of the first spring body 341 is provided with a first stop arm 345, and the outer end of the second spring body 342 is provided with a second stop arm 346. The locking pin 35 passes through the locking tongue 300, the locking member 32, the first spring body 341, and the second spring body 342. The bridging arm 347 abuts against the outer end face of the locking member 32. The first spring body 341 and the second spring body 342 are located on both sides of the locking member 32, respectively. The first stop arm 345 abuts against the inner side of the first tongue, and the second stop arm 346 abuts against the inner side of the second tongue.

[0053] In this embodiment, the locking tongue 300 presses against the limiting member 210 and the latching end 320 of the locking member 32 locks the limiting member 210, effectively preventing the fuse assembly from coming off the main body 1 due to vibration or accidental contact. This ensures that the fuse assembly will not be accidentally pulled out during normal operation, guaranteeing continuous power supply to the circuit. It fundamentally eliminates the risk of strong electric arcing when the contacts separate, prevents high-temperature electric arc from burning the first conductor 211 and the second conductor 212, and avoids serious safety accidents such as phase-to-phase short circuits or fires that may be caused by this. This extends the service life of the fuse terminal block, provides a higher level of safety protection for operators and equipment, and reduces the risk of safety accidents.

[0054] The fusible terminal block in this embodiment is equipped with a locking component. While achieving high safety in the use of the fusible terminal block, this design does not sacrifice the convenience of replacing the fuse element. When the fuse element needs to be replaced, the fixing bracket 10 can be easily pulled out by simply following specific steps (rotating the locking fastener 32 and the locking engagement 30 to unlock). After replacement, the locking component will automatically reset and lock under the action of the return spring 31 and the torsion spring 34, achieving a balance between safety and convenience.

[0055] In this embodiment, the locking member 30 and the return spring 31 provide continuous downward pressure to the locking tongue 300, ensuring it always presses against the limiting member 210, forming the first physical lock; the connection and cooperation between the locking buckle 32 and the torsion spring 34 make the locking state between the locking end 320 of the locking buckle 32 and the limiting member 210 more stable, forming the second physical lock. All of the above structures are integrated into the locking assembly, resulting in a compact structure that does not increase the volume of the fusible terminal block.

[0056] For the fusible terminal block in this embodiment, see attached... Figure 1 As shown, a cover plate 4 is also provided on one side of the main body 1. The cover plate 4 is provided with a clearance hole 40, which is used to provide movement space and installation space for the locking components. As can be seen from the above description of the operation mode, the locking component 30, the locking fastener 32, etc. all require rotation space. Therefore, by providing a clearance hole 40 on the cover plate 4, rotation operation space and installation space can be provided for the locking component 30, the locking fastener 32, etc., forming a clearance and avoiding interference.

[0057] Similar to the aforementioned design where a first pressing part 321 is provided on the locking member 32, in one embodiment, as shown in the attached... Figure 7 and attached Figure 8 As shown, a second pressing part 303 is provided at the end of the locking member 30 that is opposite to the locking tongue 300. Therefore, the design of the second pressing part 303 makes it easy to rotate the locking member 30 so that the locking part is disengaged from the limiting member 210, which is convenient for the user to operate.

[0058] Furthermore, in a preferred embodiment, a limiting surface 3031 is provided on the end of the second pressing part 303 opposite to the locking tongue 300. The limiting surface 3031 is inclined relative to the locking member 30 and is used to abut against the cover plate 4 to constrain the travel of the locking member 30 in the direction opposite to the main body 1. Thus, in combination with the rotation mode of the locking member 30, by providing the limiting surface 3031, as shown in the attached... Figure 11 As shown, when the limiting surface 3031 rotates with the locking member 30 to a certain extent, it will abut against the cover plate 4. This is the maximum rotation stroke of the locking member 30. It can be understood that by designing the corresponding inclination degree of the limiting surface 3031, the maximum rotation stroke of the locking member 30 can be controlled.

[0059] In other embodiments, the edge of the clearance hole 40 is provided with a first flange 401, as shown in the attached figure. Figure 2 As shown, a second flange 402 is provided on the side of the main body 1 away from the clearance hole 40. When adjacent fusible terminals are spliced, the adjacent first flange 401 and second flange 402 are spliced ​​together to form a storage space. It is conceivable that fusible terminals may be used in practice in the form of multiple parallel arrangements. Therefore, the structure protruding from the main body 1 (or cover plate 4) needs a specific space to accommodate it, so as to avoid exposure and further reduce the possibility of misoperation. This embodiment uses the adjacent first flange 401 and second flange 402 to splice together to form a storage space, thereby accommodating the protruding structure.

[0060] In addition, as attached Figure 2 and attached Figure 13 As shown, the fusible terminal block in this embodiment also includes a pressure plate 51 assembly. The pressure plate 51 assembly includes a flip bracket 50 and a pressure plate 51. One end of the flip bracket 50 is hinged to the second flange 402, and the pressure plate 51 is fixedly disposed at the other end of the flip bracket 50. When the flip bracket 50 is flipped to a vertical position, the pressure plate 51 presses against the top of the plug-in bracket 21. The pressure plate 51 assembly is also designed to constrain the fusible component from being removed from the main body 1. The principle is that the pressure plate 51 presses against the top of the plug-in bracket 21 to prevent the plug-in bracket 21 from being removed. When it is necessary to remove the fusible component, the flip bracket 50 can be rotated first to move the pressure plate 51 away from the top of the plug-in bracket 21, and the locking member 30 and the latching member 32 mentioned above can be released from locking the limiting member 210, so that the fusible component can be removed.

[0061] When using only one fusible terminal block, or for a fusible terminal block located at the very edge, the flip-up bracket 50 is not stable enough and is easily flipped due to accidental operation. To solve this problem, in an improved embodiment, the pressure plate 51 is provided with a first engaging portion 511, and the top of the plug-in bracket 21 is provided with a second engaging portion 512. The first engaging portion 511 and the second engaging portion 512 are magnetically attracted to each other. Obviously, since the first engaging portion 511 and the second engaging portion 512 form a magnetic engagement, it can ensure that the pressure plate 51 is stably pressed against the top of the plug-in bracket 21, and also achieve a self-positioning effect, that is, in the final stroke, the magnetic attraction can spontaneously guide the pressure plate 51 to press into the correct position, thereby improving the ease of operation.

[0062] In addition, the fuse-type terminal block of this embodiment can also have a continuity indication effect. In a preferred embodiment, a lamp hole 60 is provided on the top of the main body 1, and a viewing window 61 is provided on the top of the lamp hole 60. An LED bead (not shown in the figure) is provided inside the lamp hole 60, and the LED bead includes a first pin and a second pin. A PCB board 62 is provided inside the main body 1, and the PCB board 62 is electrically connected to the first conductor 211, and the first pin is electrically connected to the PCB board 62. As shown in the attached figure. Figure 6 As shown, the main body 1 also includes a first contact 631 and a second contact 632 electrically connected by built-in wires. The second pin is electrically connected to the first contact 631, and the second contact 632 is electrically connected to the second conductor 212. The indication principle is as follows: when the fuse 22 is properly connected, the PCB board 62 can be normally powered, and a normal circuit can be formed between the first and second pins to allow the LED to light up normally; when the fuse 22 is not properly connected, the LED cannot light up, thus achieving the continuity indication effect.

[0063] Specifically, a PCB cavity is provided inside the main body 1. The PCB cavity is located between the first conductor 211 and the first wiring part 101 on the main body 1. The built-in wire can be pre-embedded on the main body 1 (on the side relatively away from the cover plate 4), so that the PCB board 62 and the fuse assembly are independently distributed on the main body 1. This avoids affecting the continuity indicator accessories when the fuse assembly is replaced. At the same time, locking and unlocking the locking assembly will not affect the continuity indicator circuit.

[0064] Specifically, a current-limiting resistor is integrated on the PCB board 62. The current-limiting resistor, LED beads, and built-in wires are connected in series to form a continuity indicator circuit, which is used to indicate the current working status of the fuse terminal. The structure of the first contact 631 and the second contact 632 is not specifically limited. The lead ends can be fixed by welding, or an elastic conductive structure can be used to form a stable electrical connection through interference fit.

[0065] Example 2

[0066] Combined with appendix Figure 1 To be continued Figure 14This embodiment proposes a replacement method for the fusible terminal block described in the technical solution of Embodiment 1, comprising: rotating the flip bracket 50 away from the main body 1, so that the pressure plate 51 is away from the plug-in bracket 21; rotating the locking member 32 so that the latching end 320 is away from the limiting member 210, and simultaneously rotating the locking member 30 so that the locking tongue 300 is away from the limiting member 210; rotating or pulling out the plug-in bracket 21 and replacing the fusible core 22 thereon, and then re-inserting the fusible assembly into the main body 1, ensuring that one end of the fusible core 22 is electrically connected to the first wiring part 101 through the first conductor 211, and the other end of the fusible core 22 is electrically connected to the second wiring part 102 through the second conductor 212; the locking assembly naturally resets under the action of the return spring 31 and the torsion spring 34, ensuring that the locking tongue 300 is pressed against the upper side of the limiting member 210, and the latching end 320 is latched against the limiting member 210; rotating the flip bracket 50 so that the pressure plate 51 presses against the top of the plug-in bracket 21.

[0067] The replacement method described in this embodiment can be used to replace the fuse element 22 or the fuse assembly.

[0068] Example 3

[0069] Combined with appendix Figure 1 To be continued Figure 14 This embodiment proposes an assembly method for the fusible terminal block described in the technical solution of Embodiment 1, comprising: assembling a second engaging part 512 and a fusible core 22 on a plug-in bracket 21 to form a fusible assembly; inserting the fusible assembly into the main body 1; hingedly mounting a locking member 32 and a torsion spring 34 on a locking member 30 to form a locking assembly; hingedly mounting the locking member 30 on a fixed bracket 10 to connect the locking assembly to the fixed bracket 10; providing a return spring 31 between the locking member 30 and the inner wall of the main body 1 or between the fixed brackets 10 to ensure that the locking tongue 300 presses against the upper side of the limiting member 210, and that the fastening end 320 fastens with the limiting member 210; fixing the flip bracket 50 and the pressure plate 51 together to form a pressure plate 51 assembly; hinged the flip bracket 50 to the main body 1 to ensure that the first engaging part 511 and the second engaging part 512 magnetically engage.

[0070] In this embodiment, the order of the steps of inserting the fuse component into the main body 1 and assembling the locking component onto the main body 1 is not limited.

[0071] In this embodiment, after the locking components are assembled, the cover plate 4 is fastened onto the main body 1.

[0072] In this embodiment, the assembly of the fuse component and the locking component in the main body 1 is mainly described. Therefore, the assembly of the components related to the conduction indicator circuit will not be described in this embodiment.

[0073] The assembly method described in this embodiment enables the overall assembly of the fusible terminal block. By modularizing the fusible assembly, locking assembly, and pressure plate assembly and then assembling them sequentially, this design simplifies the manufacturing process, ensures product consistency, and facilitates subsequent maintenance and repair.

[0074] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A fusible terminal block, comprising a main body and a detachable fusible assembly inserted into the main body, wherein the main body is provided with a first wiring portion and a second wiring portion, and the fusible assembly includes a plug-in bracket and a detachable fusible core thereon, one end of the fusible core being electrically connected to the first wiring portion via a first conductor, and the other end of the fusible core being electrically connected to the second wiring portion via a second conductor, characterized in that: A limiting component is fixedly provided on the insertion / removal bracket, and the limiting component is located below the fused core; A fixed bracket is fixedly provided inside the main body, and a locking component is provided on the fixed bracket. The locking component includes a locking member, which is rotatably mounted on the fixed bracket. A return spring is provided between the locking member and the inner wall of the main body or between the fixed bracket. The return spring is used to make the locking member tend to swing towards the side where the limiting member is located. A locking tongue is fixedly provided on the locking member, and the locking tongue is used to press against the upper side of the limiting member to prevent the fuse assembly from being pulled out from the body.

2. The fusible terminal block according to claim 1, characterized in that, The locking assembly further includes a latch, the latch tongue has an opening groove, the latch is rotatably disposed in the opening groove, and the latch is fixedly provided with a fastening end, which is used to fasten with the limiting member to restrict the rotation of the locking member; A torsion spring is provided between the latching member and the locking member, and the torsion spring is used to make the latching end tend to rotate toward the limiting member.

3. A fusible terminal block according to claim 2, characterized in that, The fastening end has a guide surface on the side opposite to the limiting member, and the guide surface is used to abut against the limiting member.

4. A fusible terminal block according to claim 2, characterized in that, The opening groove divides the latch into a first tongue and a second tongue. A blocking member is provided between the first tongue and the second tongue to restrict the one-way rotation stroke of the latch.

5. A fusible terminal block according to claim 2, characterized in that, The locking element has a first pressing part at the end opposite to the fastening end.

6. A fusible terminal block according to claim 1, characterized in that, A cover plate is provided on one side of the main body, and an avoidance hole is provided on the cover plate to provide movement space for the locking component; a second pressing part is provided on the end of the locking member opposite to the latch, and a limiting surface is provided on the end of the second pressing part opposite to the latch. The limiting surface is inclined relative to the locking member and is used to abut against the cover plate to restrict the travel of the locking member to the side opposite to the main body.

7. A fusible terminal block according to claim 6, characterized in that, The edge of the clearance hole is provided with a first flange, and the side of the main body away from the clearance hole is provided with a second flange. When adjacent fuse terminals are spliced, the adjacent first flange and second flange are spliced ​​together to form a storage space.

8. A fusible terminal block according to claim 7, characterized in that, It also includes a pressure plate assembly, which includes a flip bracket and a pressure plate. One end of the flip bracket is hinged to the second flange, and the pressure plate is fixedly disposed at the other end of the flip bracket. When the flip bracket is flipped to a vertical position, the pressure plate presses against the top of the plug-in bracket. The pressure plate is provided with a first suction part, and the top of the plug-in bracket is provided with a second suction part. The first suction part and the second suction part are magnetically attracted to each other.

9. A fusible terminal block according to any one of claims 1 to 8, characterized in that, The top of the main body is provided with a lamp hole, the top of the lamp hole is provided with a viewing window, and an LED lamp bead is provided inside the lamp hole. The LED lamp bead includes a first pin and a second pin. A PCB board is disposed inside the main body, the PCB board is electrically connected to the first conductor, and the first pin is electrically connected to the PCB board; The main body is also provided with a first contact and a second contact that are electrically connected by built-in wires. The second pin is electrically connected to the first contact, and the second contact is electrically connected to the second conductor.

10. A replacement method for the fusible terminal block according to any one of claims 1 to 9, characterized in that, include: Rotate the flip bracket away from the main body to move the pressure plate away from the insertion bracket; Rotate the locking element to move the latching end away from the limiting element, and at the same time rotate the locking element to move the locking tongue away from the limiting element; Rotate or remove the plug-in bracket and replace the fuse core on it, then reinsert the fuse assembly into the main body, ensuring that one end of the fuse core is electrically connected to the first terminal through the first conductor, and the other end of the fuse core is electrically connected to the second terminal through the second conductor. The locking assembly naturally resets under the action of the return spring and torsion spring, ensuring that the locking tongue presses against the upper side of the limiting member and that the latching end latches against the limiting member; Rotate the flip bracket to press the pressure plate onto the top of the plug-in bracket.

11. An assembly method, characterized in that, For assembling the fusible terminal block according to any one of claims 1 to 9, comprising: A second engaging part and a fusible core are assembled on the plug-in bracket to form a fuse assembly, and the fuse assembly is inserted into the main body; A locking element and a torsion spring are hinged to the locking element to form a locking assembly; A locking element is hinged to the fixed bracket to connect the locking assembly to the fixed bracket. A return spring is provided between the locking element and the inner wall of the main body or between the fixed brackets to ensure that the locking tongue is pressed against the upper side of the limiting element and the latching end is latched to the limiting element. The flip bracket and the pressure plate are fixedly connected to form a pressure plate assembly. The flip bracket is hinged to the main body to ensure that the first suction part and the second suction part are magnetically attracted to each other.

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