Low-voltage switch with wiring protection function

Abstract

The invention relates to the field of low-voltage switches, and discloses a low-voltage switch with a wiring protection function, the low-voltage switch comprises a shell, fastening bolts and protection plates, the fastening bolts are arranged on the two sides of the top of the shell, the protection plates are located on the two sides of the shell and are distributed corresponding to the fastening bolts to fix a cable, and a plurality of movable frames are arranged in the middles of the protection plates; a base is fixed to the side wall of the protection plate, a trapezoidal groove is formed in the middle of the base, a trapezoidal block matched with the trapezoidal groove is rotationally arranged at the bottom of the fastening bolt, the trapezoidal block is pressed downwards to be meshed with the trapezoidal groove to fix a cable, a groove is formed in the side wall of the trapezoidal block, and a bent plate is rotationally arranged at the end of the movable frame. And if the cable is loosened due to vibration or external force, the trapezoidal block is loosened and moves upwards, and the end part of the bending plate prevents the trapezoidal block from moving upwards, so that the trapezoidal block is prevented from being loosened due to rotation or vibration of the bolt, the anti-vibration and anti-loosening capability of crimping and fixing the end part of the cable is enhanced, and the long-term reliability and safety of electrical connection are improved.

Description

Technical Field

[0001] This invention relates to the field of low-voltage switches, and more specifically to a low-voltage switch with wiring protection function. Background Technology

[0002] Low-voltage switches are fundamental components in power distribution systems, and the reliable connection of their terminals directly affects the safe and stable operation of the entire circuit. Depending on the number of phase wires, low-voltage switches can be classified into single-pole, double-pole, and three-pole types, but their core conductor connection structure and the reliability issues they face are common.

[0003] Traditional low-voltage switches often use bolt-fitted terminals for wiring. This involves tightening bolts to directly press a pressure plate or washer against the exposed conductor end of the cable to achieve an electrical connection. The clamping force acts only on a single point or plane at the cable end. Under long-term operation, vibration, temperature changes, or unexpected external forces, the connection point is prone to loosening, and the fastening bolts can easily rotate and loosen. This leads to a decrease in the clamping force of the pressure plate on the cable, an increase in the contact resistance at the connection point, and a risk of overheating or even arcing, threatening electrical safety.

[0004] Existing wiring protection solutions primarily focus on insulation during wiring. For example, Chinese Patent Publication No. CN118054229A describes a high- and low-voltage switch with wiring protection function. This includes a switch control box with a socket on one side and a protective plug adapted to the socket. The protective plug includes a housing with a wiring port on the side away from the socket. The housing consists of a detachably connected upper and lower housing. A connecting component and a energizing component are located inside the lower housing, and an insulating component is located beside the energizing component. When a circuit fault occurs, the insulating component separates the energizing and connecting components, preventing the switch control box from being energized and avoiding damage to the switch control box. This solves the problem that existing high- and low-voltage switch protection connectors only protect workers during wiring but do not protect the equipment itself. While such solutions can protect the switch body during circuit faults, they do not fundamentally optimize or enhance the reliability of the wiring connection itself.

[0005] Therefore, a new type of low-voltage switch wiring structure is needed, whose protection function focuses directly on improving the anti-loosening ability of the wiring points themselves, thereby fundamentally improving the long-term reliability of the wiring connection and achieving protection of the connecting wires through anti-loosening wiring. Summary of the Invention

[0006] The purpose of this invention is to provide a low-voltage switch with wiring protection function to solve the above-mentioned problems. The cable is fixed by pressing down the trapezoidal block and engaging with the trapezoidal groove. If the cable loosens due to vibration or external force, the trapezoidal block will loosen and move upward. The end of the bending plate hinders the upward movement of the trapezoidal block, thereby preventing the trapezoidal block from loosening due to bolt rotation or vibration. This enhances the anti-vibration and anti-loosening ability of the cable end crimping fixation, and improves the long-term reliability and safety of the electrical connection, as detailed below.

[0007] To achieve the above objectives, the present invention provides the following technical solution: The present invention provides a low-voltage switch with wiring protection function, including a housing, fastening bolts and a protective plate. Fastening bolts are provided on both sides of the top of the housing. The protective plate is located on both sides of the housing and is distributed correspondingly to the fastening bolts to fix the cable. Multiple movable brackets are provided in the middle of the protective plate. The protective plate has a base fixed to its side wall. The base has a trapezoidal groove in the middle. The bottom of the fastening bolt has a trapezoidal block that is adapted to the trapezoidal groove. The trapezoidal block presses down and engages with the trapezoidal groove to fix the cable. The side wall of the trapezoidal block has a groove. The end of the movable frame has a bending plate that rotates. When the trapezoidal block moves upward, the end of the bending plate abuts against the side wall of the groove to prevent the trapezoidal block from moving upward.

[0008] When using the aforementioned low-voltage switch with wiring protection function, during wiring, the cable is inserted into the base along the lead groove, and the fastening bolt is tightened downwards to drive the trapezoidal block to move downwards along the guide block. The trapezoidal block engages with the trapezoidal groove to press the cable end. At the same time, the side slope of the trapezoidal block, which is wider at the top and narrower at the bottom, pushes the bending plate to rotate downwards. The bending plate drives the movable frame to move along the support plate towards the opening of the lead groove. The movable frame pushes the wire clamp plate to move horizontally towards the lead cylinder through the irregular frame. Since the middle section of the wire clamp plate is rotatably connected to the wire frame and fits against the inner wall of the slot of the lead cylinder, and the opening size of the wire groove is larger than the slot opening, the middle part of the wire clamp plate gradually shrinks inwards due to the constraint of the inner wall of the slot during the horizontal movement towards the lead cylinder, thereby clamping and fixing the middle section of the cable at the end of the wire clamp plate. When disconnecting the cable, push the bending plate inward through the reset hole to disengage its end from the groove of the trapezoidal block and compress the guide spring, thus releasing the restriction on the upward movement of the trapezoidal block. Then, loosen the fastening bolt in the opposite direction. The trapezoidal block moves upward with the bolt, and its inclined surface separates from the trapezoidal groove to release the cable end. After the trapezoidal block moves upward, the end of the movable frame loses the limit of the trapezoidal block, causing the irregular frame to reset and move under the push of the transmission spring. This moves the wire clamp away from the lead tube, and the end of the wire clamp gradually moves into the lead groove, so that the middle section of the wire clamp is no longer pressed against the groove opening, thereby releasing the middle section of the cable. The cable can then be pulled out of the lead groove. When adapting to cables of different diameters, the depth of the trapezoidal block's downward movement varies with the cable diameter, and the displacement amplitude of its side inclined surface pushing the bending plate and movable frame changes accordingly. This, in turn, adjusts the translation distance and degree of convergence of the wire clamp plate toward the lead tube, thereby achieving adaptive clamping of the middle section of cables of different diameters.

[0009] Preferably, the trapezoidal block is wider at the top and narrower at the bottom, and when the trapezoidal block moves downward, it pushes the bending plate to rotate downward, and when the trapezoidal block moves upward, the guide spring pushes the end of the bending plate to fit into the groove.

[0010] Preferably, the upper end of the bending plate is a positioning section, and the side wall of the positioning section is attached to the movable frame. When the bending plate rotates upward, the positioning section is attached to the movable frame to prevent the bending plate from moving upward.

[0011] Preferably, the housing has lead wire grooves at both ends, the base is located in the lead wire grooves and the cable enters the base through the lead wire grooves to connect the circuit.

[0012] Preferably, the base has a support plate on both sides of the top, the movable frame is distributed correspondingly to the support plate and is slidably connected to the middle of the support plate, the end of the movable frame near the opening of the lead wire groove is fixed with a special-shaped frame, the wire frame is fixed between the special-shaped frames, and the wire frame has a wire groove in the middle.

[0013] Preferably, the side wall of the wire frame is fixed with multiple rotating shafts arranged in a ring around the conductor groove. The ends of the rotating shafts are rotatably provided with wire clamps. The outer wall of the protective plate is fixed with a lead tube. The end of the lead tube has a slot. The middle section of the wire clamp fits against the inner wall of the slot. The conductor groove is larger than the slot opening. The trapezoidal block pushes the bending plate and the movable frame to move, so that the irregular frame moves synchronously. The multiple wire clamps move with the irregular frame and approach the lead tube, so that the ends of the wire clamps close together to clamp the middle section of the cable.

[0014] Preferably, the upper side of the base is fixed with a plurality of transmission seats corresponding to the support plate, the irregular frame corresponds to and is slidably connected to the transmission seats, the middle section of the irregular frame is fixed with a top plate, and the middle section of the irregular frame is sleeved with transmission springs at both ends abutting against the top plate and the transmission seats respectively.

[0015] Preferably, the top two sides of the outer casing are provided with fixing holes corresponding to the fastening bolts, the lead wire groove is located at the bottom of the fixing hole, and the inner walls of the lead wire groove are provided with guide grooves on both sides. The trapezoidal block is fixed with guide blocks that slide up and down with the guide grooves at both ends. Multiple reset holes penetrating the lead wire groove are provided on both sides of the outer casing. The reset holes correspond to the bending plate to adjust the angle of the bending plate and release the trapezoidal block.

[0016] Preferably, the inner wall of the trapezoidal groove is provided with a plurality of slots that are adapted to the groove.

[0017] Preferably, a gate is provided in the middle of the upper side of the housing, and a fastening groove is provided at the bottom of the housing.

[0018] The beneficial effects are as follows: 1. By tightening the fastening bolts, the trapezoidal block is pressed down and engaged with the trapezoidal groove to fix the cable. If the cable tends to loosen due to vibration or external force, it will be transmitted to the trapezoidal block, causing it to have an upward loosening tendency. At this time, the end of the bending plate will abut against the groove in the side wall of the trapezoidal block, preventing the trapezoidal block from moving upward, thereby preventing the trapezoidal block from loosening due to bolt rotation or vibration, enhancing the anti-vibration and anti-loosening ability of the cable end crimping fixation, and improving the long-term reliability and safety of the electrical connection. 2. A single tightening operation: while the tightening bolt drives the trapezoidal block to press down and fix the cable end, its inclined surface simultaneously pushes the bending plate and movable frame to move. In turn, the wire frame drives multiple ring-distributed wire clamps to move and retract towards the lead tube, realizing synchronous clamping of the middle section of the cable. The action of tightening the bolt is transformed into clamping the cable end and middle section, and the synchronization is high, which improves the wiring efficiency and wiring reliability. 3. When disconnecting the cable, loosen the fastening bolts in the opposite direction; the trapezoidal block moves upward with the bolts, releasing the cable end. At the same time, the compressed transmission spring immediately releases its elastic force, pushing the top plate and the irregular frame to move in the opposite direction and reset. As the cable clamp moves away, its middle part is released from the constraint of the slot. The free ends of each cable clamp automatically unfold outward under the action of elasticity or self-weight, thereby simultaneously releasing the clamping of the middle section of the cable. This process realizes the simultaneous completion of the end fastening release and the middle section clamping release, making it convenient, fast and safe to pull out the cable. 4. After the wiring is completed, the end of the bending plate automatically springs into the groove of the trapezoidal block under the action of the guide spring, preventing the trapezoidal block from moving upwards accidentally. At the same time, the groove of the trapezoidal block corresponds to the edge of the corresponding slot on the inner wall of the trapezoidal groove, increasing the friction force and resisting the loosening of the connection caused by vibration or cable tension, thus improving the long-term stability and safety of the electrical connection. 5. The downward pressing depth of the trapezoidal block is adjusted according to the cable diameter, thereby changing the displacement amplitude of the pushing bending plate and the movable frame. The displacement of the movable frame is transmitted to the wire frame through the irregular frame, which in turn controls the translation distance of the wire clamp plate towards the lead tube. Since the middle section of the wire clamp plate is constrained by the fixed slot, its degree of closure is directly related to the translation distance. Therefore, it can adapt to cables of different diameters and maintain sufficient clamping force. It has strong versatility and the multiple wire clamp plates have uniform contact, avoiding the problem of single, unchangeable clamping damaging the cable or being too loose and causing clamping failure. 6. The guide spring ensures the stability of the return spring force of the bending plate. The fit between its positioning section and the movable frame limits the over-return, allowing the bending plate to abut against the groove. The transmission spring provides the return force and pre-tightening force for the irregular frame and wire clamp, enabling the reset of each component after wire disconnection and providing a definite initial position for the next wiring operation. The operation cycle is reliable and the reset is accurate. 7. The locking mechanism can be easily released by using a tool to pry the bending plate from the outside through the preset reset hole on the outer casing. The wire can be disconnected without disassembling the switch, making maintenance convenient. The entire wire disconnection process is logically clear, simple in steps, and easy to operate, reducing the possibility of misoperation. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a three-dimensional structural schematic diagram of the present invention; Figure 2 This is a structural breakdown diagram of the present invention; Figure 3 This is a partial structural schematic diagram of the present invention; Figure 4 This is the present invention. Figure 3 A magnified structural diagram at point A; Figure 5 This is a partial structural diagram of the present invention from another angle; Figure 6 This is the present invention. Figure 5 A magnified structural diagram at point B; Figure 7 This is a partial structural breakdown diagram of the present invention; Figure 8 This is a schematic diagram of the fastening bolt of the present invention; Figure 9 This is a schematic diagram of the structure of the protective plate of the present invention; Figure 10 This is a schematic diagram of the structure of the movable frame of the present invention; Figure 11 This is the present invention. Figure 10 A magnified structural diagram at point C; Figure 12 This is a three-dimensional structural diagram of the bottom of the present invention; Figure 13 This is the present invention. Figure 12 A magnified structural diagram at point D.

[0021] The annotations in the attached figures are explained as follows: 1. Outer shell; 101. Lead wire groove; 102. Fixing hole; 103. Fastening groove; 104. Knife gate; 105. Guide groove; 106. Reset hole; 2. Fastening bolt; 201. Trapezoidal block; 201a. Guide block; 202. Groove; 3. Protective plate; 301. Base; 302. Trapezoidal groove; 302a. Slot; 303. Lead wire tube; 303a. Groove opening; 304. Support plate; 305. Transmission seat; 4. Movable frame; 401. Bending plate; 401a. Positioning section; 402. Guide spring; 403. Irregular frame; 403a. Top plate; 404. Transmission spring; 405. Wire frame; 405a. Wire groove; 406. Rotating shaft; 407. Wire clamp plate. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0023] See Figures 1-13 As shown, the present invention provides a low-voltage switch with wiring protection function, including a housing 1, fastening bolts 2 and a protective plate 3. Fastening bolts 2 are provided on both sides of the top of the housing 1. The protective plate 3 is located on both sides of the housing 1 and is distributed corresponding to the fastening bolts 2 to fix the cable. Multiple movable frames 4 are provided in the middle of the protective plate 3. A base 301 is fixed to the side wall of the protective plate 3. A trapezoidal groove 302 is provided in the middle of the base 301. A trapezoidal block 201 that matches the trapezoidal groove 302 is rotatably connected to the bottom of the fastening bolt 2 (see details). Figures 7-9 During wiring operations, tightening the fastening bolt 2 moves the trapezoidal block 201 downwards, causing it to press down and engage with the trapezoidal groove 302 to clamp the cable end placed therein. The trapezoidal block 201 also has a groove 202 on its side wall (see details). Figure 8 The end of the movable frame 4 that extends into the base 301 is provided with a bending plate 401 that rotates via a pin. A guide spring 402 is provided between the inner side of the bending plate 401 and the movable frame 4 (see details). Figure 4 , Figure 11 During the unloading operation, when the trapezoidal block 201 is moved upward by the bolt, the guide spring 402 pushes the end of the bending plate 401 to rotate inward and abut against the side wall of the groove 202 to prevent the trapezoidal block 201 from moving upward.

[0024] As an optional implementation, the trapezoidal block 201 is a trapezoidal protrusion that is wider at the top and narrower at the bottom. When tightening the fastening bolt 2 during wiring operations, the trapezoidal block 201 moves downward, and its widened sidewall slope pushes the bending plate 401 to rotate downward around the axis of rotation. During this process, the guide spring 402 is compressed and stores energy. During the wire removal operation, when loosening the fastening bolt 2 upward, the trapezoidal block 201 begins to move upward. At this time, the compressed guide spring 402 releases its elastic force, pushing the bending plate 401 to rotate upward around the axis of rotation, causing its end to... The groove 202 on the side wall of the trapezoidal block 201 is reset and fitted to prevent the trapezoidal block 201 from moving upward. The upper end of the bending plate 401 is set as a positioning section 401a. The side wall of the positioning section 401a is fitted with the corresponding surface of the movable frame 4. When the bending plate 401 is pushed upward by the guide spring 402, the positioning section 401a rotates and finally fits tightly with the movable frame 4, thereby preventing the bending plate 401 from moving upward and shaking further, and ensuring the stability of the fitting state between the end of the bending plate 401 and the groove 202.

[0025] Both ends of the outer casing 1 are provided with lead wire grooves 101 (see details) Figure 2 The base 301 is located inside the lead groove 101. During wiring, the cable passes through the lead groove 101 and enters the base 301 to connect the circuit. Support plates 304 are provided on both sides of the top of the base 301. Movable frames 4 are distributed one-to-one with the support plates 304, and their middle parts are slidably connected to the middle of the corresponding support plate 304. A shaped frame 403 is fixedly connected to the end of the movable frame 4 near the opening of the lead groove 101. Multiple shaped frames 403 are fixedly connected to a common wire frame 405 (see details). Figure 10The wire frame 405 has a conductor groove 405a in the middle for the cable to pass through. The wire frame 405 is located in the middle of the lead groove 101 so that the cable is in the middle. Multiple rotating shafts 406 are fixed on the side wall of the wire frame 405 and are arranged in a ring around the conductor groove 405a. A wire clamp 407 is rotatably installed in the middle of each rotating shaft 406. A lead cylinder 303 is fixed on the outer side wall of the protective plate 3. The lead cylinder 303 has a slot 303a near the end of the wire frame 405. In the initial state or when the cable is not clamped, the middle section of the wire clamp 407 is attached to the inner wall of the slot 303a, and the inner diameter of the conductor groove 405a is larger than the opening size of the slot 303a. When the fastening bolt 2 is tightened during the wiring operation, the downward-moving trapezoidal block 201 pushes the bending plate 401 to rotate downward. The bending plate 401 drives The movable frame 4 connected to it moves along the support plate 304 toward the opening of the lead wire groove 101. The movement of the movable frame 4 drives the irregular frame 403 fixedly connected to it to move synchronously. The irregular frame 403 drives the wire frame 405 and the rotating shaft 406 fixed thereon to move in the direction of the lead wire drum 303. As a result, multiple wire clamps 407 gradually approach the lead wire drum 303 as the irregular frame 403 and the wire frame 405 move as a whole. Since the middle section of the wire clamp 407 is always in contact with the inner wall of the groove 303a, and the conductor groove 405a is larger than the groove 303a, during the process of moving the wire clamp 407 toward the lead wire drum 303, the middle part of the wire clamp 407 is constrained by the inner wall of the groove 303a and rotates around the rotating shaft 406. This causes the free ends of all the wire clamps 407 to converge toward the center and jointly clamp the middle section of the cable passing through the conductor groove 405a. Multiple transmission seats 305, corresponding one-to-one with the support plate 304, are fixed on the upper side of the base 301. The irregular frame 403 corresponds to and passes through the transmission seats 305 to form a sliding connection. A top plate 403a is fixed in the middle section of the irregular frame 403, and a transmission spring 404 is sleeved in the middle section of the irregular frame 403 (see details). Figure 6 Under normal conditions, the two ends of the transmission spring 404 abut against the side of the top plate 403a facing the transmission seat 305 and the side of the transmission seat 305 facing the top plate 403a. When a wiring operation is performed, the movable frame 4 is pushed by the trapezoidal block 201, causing the irregular frame 403 to move towards the opening of the lead wire groove 101. The top plate 403a moves synchronously with the irregular frame 403 and compresses the transmission spring 404. During the wire removal operation, when the fastening bolt 2 is loosened upward and the trapezoidal block 201 moves upward and releases the pressure on the bending plate 401, the compressed transmission spring 404 releases its elastic force. Its elastic force pushes the top plate 403a and the irregular frame 403 fixed thereto to move back to the direction away from the opening of the lead wire groove 101. The resetting movement of the irregular frame 403 then drives the movable frame 4 connected thereto to slide back along the support plate 304, and finally restores the bending plate 401 to the initial position. At the same time, the elastic force continuously provided by the transmission spring 404 presses the movable frame 4 and the irregular frame 403, so that the bending plate 401 can press against the trapezoidal groove 302.

[0026] The top two sides of the outer casing 1 are provided with fixing holes 102 corresponding to the fastening bolts 2. The fastening bolts 2 are threaded into the fixing holes 102. The lead wire groove 101 is located at the bottom of the fixing holes 102, and the inner walls of the lead wire groove 101 on both sides are provided with longitudinally extending guide grooves 105 (see details). Figures 12-13 Both ends of the trapezoidal block 201 are fixed with guide blocks 201a, which are slidably disposed in the corresponding guide grooves 105. This allows the trapezoidal block 201 to slide stably up and down along the trajectory of the guide grooves 105 during the downward and upward movement, preventing it from deflecting. Multiple reset holes 106 are provided on both sides of the outer casing 1 in the area corresponding to the bending plate 401, extending into the lead wire groove 101 (see details). Figure 13 When it is necessary to remove the wire, a tool can be inserted through the reset hole 106 to move the bending plate 401 so that its end is disengaged from the groove 202 of the trapezoidal block 201, thereby releasing the restriction on the upward movement of the trapezoidal block 201, and adjusting the angle of the bending plate 401 to release the trapezoidal block 201.

[0027] The inner wall of the trapezoidal groove 302 is provided with multiple slots 302a (see details). Figure 9 The slot 302a is adapted to the groove 202 on the side wall of the trapezoidal block 201. When the wiring operation is performed and the trapezoidal block 201 is pressed down to engage with the trapezoidal groove 302 to fix the cable, the groove 202 on the side wall of the trapezoidal block 201 will align with the slot 302a on the inner wall of the trapezoidal groove 302. After the wiring is completed, if the cable is subjected to an unexpected pulling force, when the pulling force is transmitted to the trapezoidal block 201 to try to move it upward, the end of the bending plate 401 will abut against the groove 202. At the same time, the edge of the groove 202 will clamp the cable end with the corresponding edge of the slot 302a, thereby providing friction to prevent the trapezoidal block 201 and the cable from loosening.

[0028] The upper middle part of the housing 1 is provided with a switch 104 for controlling the on and off of the circuit, and the bottom of the housing 1 is provided with a fastening groove 103 for mounting and fixing the entire switch to the distribution box or support structure.

[0029] Using the above structure, during wiring, the cable is inserted into the base 301 along the lead-in groove 101, and the fastening bolt 2 is tightened downwards to drive the trapezoidal block 201 to move downwards along the guide block 201a. The trapezoidal block 201 engages with the trapezoidal groove 302 to press the cable end. At the same time, the side slope of the trapezoidal block 201, which is wider at the top and narrower at the bottom, pushes the bending plate 401 to rotate downwards. The bending plate 401 drives the movable frame 4 to move along the support plate 304 towards the opening of the lead-in groove 101. The movable frame 4 passes through... The irregular frame 403 synchronously pushes the wire clamp 407 to translate towards the lead tube 303. Since the middle section of the wire clamp 407 is rotatably connected to the wire frame 405 and fits against the inner wall of the slot 303a of the lead tube 303, and the opening size of the wire slot 405a is larger than that of the slot 303a, the middle part of the wire clamp 407 gradually shrinks inward due to the constraint of the inner wall of the slot 303a during the translation towards the lead tube 303, thereby clamping and fixing the middle section of the cable at the end of the wire clamp 407. When disconnecting the cable, the bending plate 401 is pushed inward through the reset hole 106, causing its end to disengage from the groove 202 of the trapezoidal block 201 and compress the guide spring 402, thus releasing the restriction on the upward movement of the trapezoidal block 201. Then, the fastening bolt 2 is loosened in the opposite direction, and the trapezoidal block 201 moves upward with the bolt, separating its inclined surface from the trapezoidal groove 302 to release the cable end. After the trapezoidal block 201 moves upward, the end of the movable frame 4 loses the restriction of the trapezoidal block 201, causing the irregular frame 403 to reset and move under the push of the transmission spring 404, driving the wire clamp 407 away from the lead tube 303. The end of the wire clamp 407 gradually moves into the lead groove 101, so that the middle section of the wire clamp 407 is no longer pressed against the groove 303a, thereby releasing the middle section of the cable, and the cable can be pulled out from the lead groove 101. When it is necessary to adapt to cables of different diameters, the depth of the trapezoidal block 201 moving down changes with the cable diameter, and the displacement amplitude of its side inclined surface pushing the bending plate 401 and the movable frame 4 changes accordingly, thereby adjusting the translation distance and degree of convergence of the wire clamp 407 toward the lead tube 303, so as to realize the adaptation clamping of the middle section of cables of different diameters. By tightening the fastening bolt 2, the trapezoidal block 201 is pressed down and engaged with the trapezoidal groove 302 to fix the cable. If the cable tends to loosen due to vibration or external force, it will be transmitted to the trapezoidal block 201, causing it to have an upward loosening tendency. At this time, the end of the bending plate 401 will abut against the groove 202 on the side wall of the trapezoidal block 201, preventing the trapezoidal block 201 from moving upward, thereby preventing the trapezoidal block 201 from loosening due to bolt rotation or vibration, enhancing the anti-vibration and anti-loosening ability of the cable end crimping fixation, and improving the long-term reliability and safety of the electrical connection.

[0030] Through a single tightening operation, the fastening bolt 2 drives the trapezoidal block 201 to press down and fix the cable end. At the same time, its inclined surface simultaneously pushes the bending plate 401 and the movable frame 4 to move. Then, through the wire frame 405, multiple wire clamps 407 distributed in a ring are moved and retracted towards the lead tube 303, realizing the synchronous clamping of the middle section of the cable. The action of tightening the bolt is transformed into clamping the cable end and middle section. The synchronization is high, which improves the wiring efficiency and wiring reliability. When disconnecting the cable, loosen the fastening bolt 2 by rotating it in the opposite direction; the trapezoidal block 201 moves upward with the bolt, releasing the cable end. At the same time, the compressed transmission spring 404 immediately releases its elastic force, pushing the top plate 403a and the irregular frame 403 to move in the opposite direction and reset. As the cable clamp 407 moves away, its middle part is released from the constraint of the slot 303a. The free ends of each cable clamp 407 automatically unfold outward under the action of elasticity or self-weight, thereby simultaneously releasing the clamping of the middle section of the cable. This process realizes the simultaneous completion of the end fastening release and the middle section clamping release, making it convenient, quick and safe to pull out the cable. After the wiring is completed, under the action of the guide spring 402, the end of the bending plate 401 automatically springs into the groove 202 of the trapezoidal block 201, preventing the trapezoidal block 201 from moving upwards accidentally. At the same time, the groove 202 of the trapezoidal block 201 corresponds to the edge of the corresponding slot 302a on the inner wall of the trapezoidal groove 302, increasing the friction force and resisting the loosening of the connection caused by vibration or cable tension, thus improving the long-term stability and safety of the electrical connection. The pressing depth of the trapezoidal block 201 is adjusted according to the cable diameter, thereby changing the displacement of the bending plate 401 and the movable frame 4. The displacement of the movable frame 4 is transmitted to the wire frame 405 through the irregular frame 403, which in turn controls the translation distance of the wire clamp 407 towards the lead tube 303. Since the middle section of the wire clamp 407 is constrained by the fixed slot 303a, its degree of closure is directly related to the translation distance. Therefore, it can adapt to cables of different diameters and maintain sufficient clamping force. It has strong versatility and the multiple wire clamps 407 have uniform clamping contact, avoiding the problem of single, unchangeable clamping damaging the cable or being too loose and causing clamping failure. The guide spring 402 ensures the stability of the reset spring force of the bending plate 401. The fit between its positioning section 401a and the movable frame 4 limits the over-reset, allowing the bending plate 401 to abut against the groove 202. The transmission spring 404 provides reset force and pre-tightening force for the irregular frame 403 and the wire clamp 407, enabling the reset of each component after wire disconnection and providing a definite initial position for the next wiring operation. The operation cycle is reliable and the reset is accurate. The bend plate 401 can be easily moved from the outside to release the lock by using a tool through the preset reset hole 106 on the outer casing 1. The wire disconnection operation can be performed without disassembling the switch, which is convenient for maintenance. The entire wire disconnection process is logically clear, the steps are simple, and the operation is convenient, reducing the possibility of misoperation.

[0031] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A low voltage switch with a line protection function, characterized by: Including shell (1), fastening bolt (2) and guard plate (3), both sides of the top of the shell (1) are provided with fastening bolt (2), the guard plate (3) is located on both sides of the shell (1) and is distributed with fastening bolt (2) to fix cable, the middle part of the guard plate (3) is provided with multiple movable racks (4); The side wall of the guard plate (3) is fixed with a base (301), a trapezoidal groove (302) is formed in the middle part of the base (301), a trapezoidal block (201) is rotatably arranged at the bottom of the fastening bolt (2) and is matched with the trapezoidal groove (302), the trapezoidal block (201) is pressed down to engage with the trapezoidal groove (302) to fix the cable, and the side wall of the trapezoidal block (201) is provided with a groove (202), the end of the movable rack (4) is rotatably provided with a bent plate (401), when the trapezoidal block (201) moves upwards, the end of the bent plate (401) abuts against the side wall of the groove (202) to prevent the trapezoidal block (201) from moving upwards.

2. The low voltage switch with a connection protection function according to claim 1, characterized in that: The trapezoidal block (201) is wide at the top and narrow at the bottom, and when the trapezoidal block (201) moves downwards, the bent plate (401) is pushed to rotate downwards, and when the trapezoidal block (201) moves upwards, the end of the bent plate (401) is pushed by the guide spring (402) to fit the groove (202).

3. The low voltage switch with a connection protection function according to claim 2, characterized in that: The end of the bent plate (401) is a positioning section (401a), the side wall of the positioning section (401a) abuts against the movable rack (4), and when the bent plate (401) rotates upwards, the positioning section (401a) abuts against the movable rack (4) to prevent the bent plate (401) from moving upwards.

4. The low voltage switch with a connection protection function according to claim 1, characterized in that: Both ends of the shell (1) are provided with lead grooves (101), the base (301) is located in the lead groove (101), and the cable enters the base (301) through the lead groove (101) to connect the circuit.

5. A low voltage switch with a line protection function according to claim 4, characterized in that: Both sides of the top of the base (301) are provided with supporting plates (304), the movable racks (4) are distributed correspondingly with the supporting plates (304) and are slidably connected to the middle parts of the supporting plates (304), the ends of the movable racks (4) close to the openings of the lead grooves (101) are fixed with special-shaped racks (403), the special-shaped racks (403) are fixed with wire racks (405) therebetween, and the middle part of the wire rack (405) is provided with a wire groove (405a).

6. A low voltage switch with a line protection function according to claim 5, characterized in that: The side wall of the wire rack (405) is fixed with multiple rotating shafts (406) which are annularly distributed around the wire groove (405a), the ends of the rotating shafts (406) are rotatably provided with wire clamping plates (407), the outer side wall of the guard plate (3) is fixed with a lead cylinder (303), the end of the lead cylinder (303) is provided with a slot (303a), the middle section of the wire clamping plate (407) abuts against the inner wall of the slot (303a), the wire groove (405a) is larger than the slot (303a), the trapezoidal block (201) pushes the bent plate (401) and the movable rack (4) to move, so that the special-shaped rack (403) moves synchronously, and multiple wire clamping plates (407) move close to the lead cylinder (303) along with the special-shaped rack (403), so that the ends of the wire clamping plates (407) are gathered to clamp the middle section of the cable.

7. The low voltage switch with a line protection function according to claim 5, characterized in that: The base (301) is fixed with a plurality of transmission seats (305) corresponding to the supporting plates (304) on the upside, the special-shaped frame (403) is corresponding to the transmission seat (305) and is slidably connected, the middle section of the special-shaped frame (403) is fixed with a top plate (403a), and the middle section of the special-shaped frame (403) is sleeved with a transmission spring (404) with two ends abutting against the top plate (403a) and the transmission seat (305) respectively.

8. The low voltage switch with a line protection function according to claim 4, characterized in that: The outer shell (1) is provided with a fixing hole (102) corresponding to the fastening bolt (2) on each side of the top, the lead slot (101) is located at the bottom of the fixing hole (102), guide grooves (105) are formed in the inner walls on both sides of the lead slot (101), guide blocks (201a) that are slidably connected to the guide grooves (105) are fixed at both ends of the trapezoidal block (201), a plurality of reset holes (106) that penetrate through the lead slot (101) are formed in the outer shell (1) on both sides, the reset holes (106) are corresponding to the bending plates (401) to adjust the angles of the bending plates (401) and release the trapezoidal block (201).

9. The low voltage switch with a terminal protection function according to claim 1, characterized in that: A plurality of clamping grooves (302a) that are adapted to the grooves (202) are formed in the inner walls of the trapezoidal grooves (302).

10. The low voltage switch with a terminal protection function according to claim 1, characterized in that: The outer shell (1) is provided with a gate (104) on the upside, and a fastening groove (103) is formed in the bottom of the outer shell (1).

Images