A fuse type controllable voltage limiting device

Abstract

The application discloses a fusing type controllable voltage limiter, and relates to the technical field of controllable voltage limiters, which comprises a shell, a fuse fixedly installed on the inner wall of the shell, a plurality of control buttons evenly electrically installed on the upper surface of the shell, a display fixedly installed on the upper surface of the shell, a wiring board fixedly installed on the side wall of the shell, and a stable structure arranged on the surface of the shell, wherein the stable structure is arranged on the side wall of the shell and used for reinforcing and preventing the wires installed on the wiring board from being detached, the stable structure comprises two connecting rods fixedly installed on the side wall of the shell, the stable structure is convenient for reinforcing the wires by using barbs, the wires installed on the wiring board are prevented from being detached under the action of external force, the fuse type controllable voltage limiter is prevented from being broken, and the stability of the voltage limiter during use is improved to a certain extent.

Description

Technical Field

[0001] This invention relates to the field of controllable pressure limiter technology, specifically a fusible controllable pressure limiter device. Background Technology

[0002] A controllable voltage limiter, also known as a thyristor power regulator, is a power control device based on thyristors and with a dedicated control circuit as its core. It is usually installed in a distribution cabinet and can be used in conjunction with fuses to improve the safety of the voltage limiter during use.

[0003] When using a fusible controllable voltage limiter, it is usually installed in a distribution cabinet. The distribution cabinet has many control switches and complicated wiring. When tidying up the switches in the distribution cabinet, it is easy to accidentally pull the wires. When the wires are pulled by external force, they are prone to falling off the outer casing wiring board, which can easily cause the fusible controllable voltage limiter to lose contact and affect the normal operation of the device.

[0004] Therefore, we propose a fusible controllable pressure limiting device. Summary of the Invention

[0005] The purpose of this invention is to provide a fusible controllable pressure limiting device to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a fuse-type controllable voltage limiting device, comprising a housing, a fuse fixedly installed on the inner wall of the housing, a plurality of control buttons uniformly and electrically installed on the upper surface of the housing, a display fixedly installed on the upper surface of the housing, a wiring board fixedly installed on the side wall of the housing, and a stabilizing structure provided on the surface of the housing, further comprising: a stabilizing structure respectively disposed on the side wall of the housing for reinforcing and preventing the wires mounted on the wiring board from detaching, the stabilizing structure comprising two connecting rods fixedly installed on the side wall of the housing, and a rectangular frame fixedly installed at one end of the two connecting rods close to each other. The rectangular frame surface is provided with a limiting structure to prevent the wire from shaking, an anti-detachment structure to prevent the wire from falling off the wiring board under external force, and barbs to stabilize the wire. The outer side of the barbs has an arc surface structure. Protective structures are respectively provided on the side walls of the housing to temporarily cover the heat dissipation holes on the housing. The protective structures include a cover cloth for covering the side walls of the housing. Anti-accidental touch structures are respectively provided on the upper surface of the housing to prevent accidental operation of the control button and the inverted pressure limiting device. The anti-accidental touch structure includes a limiting frame with a "U"-shaped cross-section fixedly installed on the surface of the housing. A rotating block is rotatably installed on the surface of the limiting frame.

[0007] The aforementioned components achieve the following effects: By establishing a sturdy structure, the use of barbs to secure the wires is facilitated, reducing the likelihood of wires coming loose when mounted on the wiring board under external force, which could lead to the fuse breaking and the voltage limiter disconnecting. This improves the stability of the voltage limiter during use to some extent. The protective structure facilitates flexible covering of the side panels of the housing, maintaining the permeability of the side ventilation holes and further improving the heat dissipation effect. The anti-accidental touch structure facilitates covering the control buttons with the frame, and the rotating block applies pressure to the control buttons, reducing the need for accidental touch prevention and improving the accuracy of button operation.

[0008] Preferably, the anti-detachment structure includes two connecting plates fixedly installed on the surface of a rectangular frame. A circular rod is rotatably installed on one side of the two connecting plates that are close to each other. A rotating plate is fixedly installed on the side wall of the circular rod. A sliding frame is slidably inserted inside the rotating plate. A pressure plate is fixedly installed on the lower side of the sliding frame. The two ends of the pressure plate are bent. Six barbs are fixedly installed in groups of three on the inner side of the two pressure plates. A spring is fixedly installed on the side of the sliding frame and the pressure plate that are close to each other.

[0009] The above components achieve the following effect: the pressure plate is pressed against the wire by the spring force on the rotating block. After the wire is pulled a certain distance, it is installed on the wiring board. When the wire is pulled back, the barbs will penetrate into the wire. At this time, the wire can be stabilized. The greater the external force on the wire, the deeper the wire penetrates into the barbs, thereby improving the stability of the wire fixed on the wiring board.

[0010] Preferably, a connecting frame with a "T"-shaped cross-section is fixedly installed on one side of the two connecting plates that are close to each other. An elastic rope is fixedly installed on one side of the connecting frame and the rotating plate that are close to each other. A positioning block is fixedly installed on the side wall of the circular rod. A pin is slidably inserted inside the positioning block. An insertion hole is opened on the surface of the connecting plate. The size of the insertion hole is adapted to the size of the pin.

[0011] The effect achieved by the above components is as follows: when it is necessary to remove the wire from the wiring board for maintenance, the pin inserted into the inner wall of the socket on the connecting plate is pulled out. At this time, the rotating block will be lifted by the elastic rope on the connecting frame, which will cause the sliding frame and the pressure plate to be lifted. At this time, the barbs will be raised, which facilitates the removal of the wire between the two pressure plates.

[0012] Preferably, the limiting structure includes two fixed rods fixedly installed on the surface of a rectangular frame. A limiting cylinder is fixedly installed at one end of the two fixed rods that are close to each other. The side of the limiting cylinder away from the fixed rods is a hollow frustum structure. Two limiting frames are slidably installed inside the limiting cylinder. A slot with a "V" shaped cross-section is opened on one side of the limiting frame. An arc surface is provided on one side of the limiting frame. A driving rod is threaded through the inside of the limiting cylinder. The driving rod is rotatably connected to the inside of the limiting frame.

[0013] The above-mentioned components achieve the following effects: the wire is fitted into the inner wall of the limiting cylinder, and the limiting cylinder with a hollow frustum structure at the end facilitates the insertion of the wire. When the drive rod is rotated, the drive rod will push the limiting frame to move, and the "V" shaped groove on the limiting frame will limit the wire, reducing the possibility of the wire shaking after reinforcement.

[0014] Preferably, the protective structure further includes a protruding frame fixedly installed on the side wall of the outer shell, a movable frame slidably installed on the surface of the protruding frame, and a plurality of barbs uniformly fixedly installed on the side wall of the movable frame, and the cover cloth is covered on the surface of the plurality of barbs.

[0015] The effect achieved by the above components is as follows: take out a clean, breathable cloth, lay the cloth flat on the surface of the moving frame, and put the two sides of the cloth over the surfaces of the two rows of barbs to achieve the initial fixation of the cloth.

[0016] Preferably, a protrusion is fixedly installed on the surface of the outer shell, and a screw is threaded through the internal thread of the protrusion, and the screw is rotatably connected to the internal part of the movable frame.

[0017] The effect achieved by the above components is as follows: rotating the screw inside the protrusion will cause the moving frame to slide on the surface of the protrusion, which can tighten and fix the cloth on the surface of the protrusion, thereby facilitating the stable covering of the heat dissipation holes on the side of the outer shell.

[0018] Preferably, a sliding rod with a U-shaped cross-section is slidably inserted inside the movable frame. A push plate is fixedly installed at one end of the sliding rod located on the inner wall of the movable frame. A plurality of protrusions are uniformly fixedly installed on the surface of the push plate, and the cross-section of the protrusions is "V" shaped.

[0019] The effect achieved by the above components is as follows: when the sliding bar is pulled, the sliding bar will drive the push plate to move, and the protrusions on the push plate will be placed on the two long sides of the cover. The "human" shaped protrusions improve the stability of fixing the two long sides of the cover.

[0020] Preferably, the anti-accidental touch structure includes a cover frame fixedly installed on the outer surface of the control button housing, the surface of the cover frame having a slot, a pull block fixedly installed on the surface of the rotating block, and a pull ring rotatably installed on the inner wall of the pull block.

[0021] The above-mentioned components achieve the following effect: when it is necessary to operate the control button, pulling the pull ring will cause the rotating block to rotate outside the limit frame, thereby driving the rotating block to rotate. At this time, the rotating block will squeeze the control button, thus realizing the operation of the control button. By setting the cover frame, the control button is covered, reducing the possibility of accidental touch due to external force on the control button.

[0022] Preferably, a rotating rod is rotatably mounted inside the rotating block, and rollers are fixedly mounted on the side wall of the rotating rod.

[0023] The effect achieved by the above components is that by setting the rollers, the friction of the rotating block during the movement of the control button is reduced, further improving the stability of the control button during its movement.

[0024] Preferably, a plastic sheet is bonded to the surface of the control button, and the plastic sheet is made of acrylic sheet.

[0025] The above-mentioned components achieve the following effects: the plastic sheet facilitates the covering of the control button surface, reduces the possibility of damage to the lettering due to pressure on the control button surface, and facilitates the protection of the control button.

[0026] Compared with the prior art, the beneficial effects of the present invention are: This invention, by setting a stable structure, facilitates the use of barbs to secure the wires, reduces the likelihood of the wires coming loose when mounted on the wiring board under external force, and thus prevents the fuse voltage limiter from breaking contact, thereby improving the stability of the voltage limiter during use to a certain extent.

[0027] By setting up a protective structure, this invention facilitates the flexible covering of the side cover of the outer casing, maintains the permeability of the heat dissipation holes on the side of the outer casing, and further improves the heat dissipation effect of the outer casing.

[0028] This invention, by setting an anti-accidental touch structure, facilitates the work of covering the control buttons with a cover frame, and by setting a rotating block to apply pressure to the control buttons, reduces the work of preventing accidental touches of the control buttons and improves the accuracy of the operation of the control buttons. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a partial structural diagram of the present invention; Figure 3 This is a schematic diagram of the stabilizing structure in this invention; Figure 4 In this invention Figure 2 A partial structural diagram; Figure 5 In this invention Figure 3 Enlarged view of point C; Figure 6 This is a schematic diagram of the protective structure in this invention; Figure 7 This is a schematic diagram of the structure at the movable frame in this invention; Figure 8 In this invention Figure 6 Enlarged view of point B; Figure 9 In this invention Figure 1 Enlarged view of point A; Figure 10 This is a schematic diagram of the structure of the shielding frame in this invention.

[0030] In the diagram: 1-Housing; 2-Fuse; 3-Control button; 4-Display; 5-Wiring board; 6-Stabilizing structure; 61-Connecting rod; 62-Rectangular frame; 63-Limiting structure; 631-Limiting cylinder; 632-Limiting frame; 633-Drive rod; 634-Fixing rod; 64-Anti-detachment structure; 641-Pressure plate; 642-Elastic rope; 643-Slide frame; 644-Connecting plate; 645-Connecting bracket; 646-Pin; 6 47-Spring; 648-Positioning block; 649-Rotating plate; 65-Barb; 7-Protective structure; 71-Protruding frame; 72-Moving frame; 73-Covering cloth; 74-Screw; 75-Protrusion; 76-Hook; 77-Sliding rod; 78-Push plate; 79-Protruding bar; 8-Anti-accidental contact structure; 81-Covering frame; 82-Limiting frame; 83-Rotating block; 84-Plastic sheet; 85-Rotating rod; 86-Roller; 87-Pull block; 88-Pull ring. Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Please see Figure 1-10This invention provides a technical solution: a fuse-type controllable voltage limiting device, comprising a housing 1, a fuse 2 fixedly installed on the inner wall of the housing 1, a plurality of control buttons 3 uniformly and electrically installed on the upper surface of the housing 1, a display 4 fixedly installed on the upper surface of the housing 1, a wiring board 5 fixedly installed on the side wall of the housing 1, and a stabilizing structure 6 provided on the surface of the housing 1. It further includes: stabilizing structures 6 respectively disposed on the side wall of the housing 1 for reinforcing and preventing the wires mounted on the wiring board 5 from detaching; the stabilizing structure 6 includes two connecting rods 61 fixedly installed on the side wall of the housing 1, and a rectangular frame 62 fixedly installed at the end of the two connecting rods 61 that are close to each other; the surface of the rectangular frame 62 is provided with... The enclosure includes a limiting structure 63 to prevent the wire from shaking, an anti-detachment structure 64 to prevent the wire from falling off the wiring board 5 under external force, and barbs 65 to stabilize the wire. The outer side of the barbs 65 is an arc surface structure. Protective structures 7 are respectively installed on the side wall of the outer casing 1 to temporarily cover the heat dissipation holes on the outer casing 1. Protective structures 7 include a cover cloth 73 for covering the side wall of the outer casing 1. Anti-accidental contact structures 8 are respectively installed on the upper surface of the outer casing 1 to prevent accidental operation of the inverted pressure limiting device by accidentally touching the control button 3. Anti-accidental contact structures 8 include a limiting frame 82 with a "U"-shaped cross section fixedly installed on the surface of the outer casing 1. A rotating block 83 is rotatably installed on the surface of the limiting frame 82. By setting up the stabilizing structure 6, the barbs 65 are used to secure the wires, reducing the possibility of the wires coming loose when mounted on the wiring board 5 under external force, which could lead to the fuse breaking and the voltage limiter disconnecting. This improves the stability of the voltage limiter during use to a certain extent. By setting up the protective structure 7, the side cover 73 of the outer casing 1 is flexibly covered, maintaining the permeability of the heat dissipation holes on the side of the outer casing 1 and further improving the heat dissipation effect of the outer casing 1. By setting up the anti-accidental touch structure 8, the control button 3 is covered by the cover frame 81. The rotating block 83 applies pressure to the control button 3, reducing the need for anti-accidental touch measures and improving the accuracy of operating the control button 3.

[0033] The following section will explain the specific design and function of its stabilizing structure 6, protective structure 7, and anti-accidental touch structure 8.

[0034] like Figures 1-5As shown, the anti-detachment structure 64 includes two connecting plates 644 fixedly installed on the surface of the rectangular frame 62. A circular rod is rotatably installed on one side of the two connecting plates 644 that are close to each other. A rotating plate 649 is fixedly installed on the side wall of the circular rod. A sliding frame 643 is slidably inserted inside the rotating plate 649. A pressure plate 641 is fixedly installed on the lower side of the sliding frame 643. The two ends of the pressure plate 641 are bent. Six barbs 65 are fixedly installed in groups of three on the inner side of the two pressure plates 641. A spring 647 is fixedly installed on the side of the sliding frame 643 and the pressure plate 641 that are close to each other. The pressure plate 641 is pressed against the wire by the elastic force of the spring 647 on the rotating block 83. After the wire is pulled a certain distance, the wire is installed on the wiring board 5. When the wire is pulled back, the barbs 65 will penetrate into the wire. At this time, the wire can be stably secured. The greater the external force on the wire, the deeper the wire penetrates into the barbs 65, thereby improving the stability of the wire fixed on the wiring board 5. A T-shaped connecting frame 645 is fixedly installed on one side of the two connecting plates 644 that are close to each other. An elastic rope 642 is fixedly installed on one side of the connecting frame 645 and the rotating plate 649 that are close to each other. A positioning block 648 is fixedly installed on the side wall of the circular rod. A pin 646 slides through the inside of the positioning block 648. The surface of the connecting plate 644 has a socket, the size of which matches the size of the pin 646. When it is necessary to remove the wire from the wiring board 5 for maintenance, the pin 646 inserted into the inner wall of the socket on the connecting plate 644 is pulled out. At this time, the rotating block 83 will be lifted by the tension of the elastic rope 642 on the connecting frame 645, which will cause the sliding frame 643 and the pressure plate 641 to be lifted. At this time, the barb 65 will be raised, which will facilitate the removal of the wire between the two pressure plates 641.

[0035] The limiting structure 63 includes two fixed rods 634 fixedly installed on the surface of the rectangular frame 62. A limiting cylinder 631 is fixedly installed at one end of the two fixed rods 634 that is close to each other. The side of the limiting cylinder 631 away from the fixed rods 634 is a hollow frustum structure. Two limiting frames 632 are slidably installed inside the limiting cylinder 631. One side of the limiting frame 632 has a slot with a "V" shaped cross-section and an arc surface. A drive rod 633 is threaded through the inside of the limiting cylinder 631, and the drive rod 633 is rotatably connected to the inside of the limiting frame 632. The limiting cylinder 631, with its hollow frustum structure at one end, facilitates the insertion of the wire by placing it on the inner wall of the limiting cylinder 631. Rotating the drive rod 633 will push the limiting frame 632 to move. The "V" shaped slot on the limiting frame 632 will limit the wire, reducing the possibility of the wire shaking after reinforcement.

[0036] like Figure 2 and Figures 6-8As shown, the protective structure 7 also includes a protruding frame 71 fixedly installed on the side wall of the outer shell 1. A movable frame 72 is slidably installed on the surface of the protruding frame 71. Several barbs 76 are evenly fixedly installed on the side wall of the movable frame 72. A cloth 73 is covered on the surface of the barbs 76. Take out a clean cloth 73 with a certain degree of breathability, lay the cloth 73 flat on the surface of the movable frame 72, and cover the two sides of the cloth 73 onto the surface of the two rows of barbs 65 respectively to achieve the initial fixation of the cloth 73.

[0037] A protrusion 75 is fixedly installed on the surface of the outer casing 1. A screw 74 is threaded through the inside of the protrusion 75, and the screw 74 is rotatably connected to the inside of the movable frame 72. Rotating the screw 74 inside the protrusion 75 causes the movable frame 72 to slide on the surface of the protrusion frame 71, thereby tightening and fixing the covering cloth 73 on the surface of the protrusion frame 71, which facilitates the stable covering of the heat dissipation holes on the side of the outer casing 1. A sliding rod 77 with a "U"-shaped cross-section slides through the inside of the movable frame 72. A push plate 78 is fixedly installed at one end of the sliding rod 77 on the inner wall of the movable frame 72. Several protrusions 79 are evenly fixedly installed on the surface of the push plate 78, and the cross-section of the protrusions 79 is "V"-shaped. Pulling the sliding rod 77 causes the push plate 78 to move, and the protrusions 79 on the push plate 78 are fitted onto the two long sides of the covering cloth 73. The "V"-shaped protrusions 79 improve the stability of fixing the two long sides of the covering cloth 73.

[0038] like Figure 2 and Figure 9 as well as Figure 10 As shown, the anti-accidental touch structure 8 includes a cover frame 81 fixedly installed on the surface of the outer shell 1 of the control button 3. The surface of the cover frame 81 has a slot. A pull block 87 is fixedly installed on the surface of the rotating block 83, and a pull ring 88 is rotatably installed on the inner wall of the pull block 87. When it is necessary to operate the control button 3, the pull ring 88 is pulled, which will drive the rotating block 83 to rotate outside the limit frame 82, thereby driving the rotating block 83 to rotate. At this time, the rotating block 83 will squeeze the control button 3, thereby realizing the operation of the control button 3. By setting the cover frame 81, the control button 3 is covered, reducing the possibility of accidental touch of the control button 3 due to external force.

[0039] A rotating rod 85 is rotatably mounted inside the rotating block 83, and a roller 86 is fixedly mounted on the side wall of the rotating rod 85. By setting the roller 86, the friction of the rotating block 83 during its movement on the control button 3 is reduced, further improving the stability of the control button 3 during movement. A plastic sheet 84, made of acrylic, is glued to the surface of the control button 3. The plastic sheet 84 facilitates the covering of the surface of the control button 3, reducing the possibility of damage to the lettering due to pressure, and facilitating the protection of the control button 3.

[0040] Working principle: When installing the wire into the wiring board 5, first, the wire is placed inside the limiting cylinder 631. The limiting cylinder 631, with its hollow frustum structure at one end, facilitates the insertion of the wire. Rotating the drive rod 633 moves the limiting frame 632, which in turn limits the wire by using a "V"-shaped slot, reducing the likelihood of the wire wobbling after reinforcement. After the wire is inserted between the two pressure plates 641, the pressure plates 641 are pressed against the wire by the spring 647 on the rotating block 83. After pulling the wire a certain distance, it is installed on the wiring board 5. Pulling the wire back causes the barbs 65 to penetrate the wire, ensuring its stability. The greater the external force applied to the wire, the deeper the wire penetrates the barbs 65. This improves the stability of the wires fixed on the wiring board 5. When the wires need to be removed from the wiring board 5 for maintenance, the pin 646 inserted into the inner wall of the socket on the connecting plate 644 is pulled out. At this time, the rotating block 83 will be pulled up by the elastic rope 642 on the connecting frame 645, which will cause the sliding frame 643 and the pressure plate 641 to be lifted. At this time, the barbs 65 will be raised, which facilitates the removal of the wires between the two pressure plates 641. Inserting the pin 646 into the inner wall of the socket allows the two pressure plates 641 to be used normally. By setting the stabilizing structure 6, it is convenient to use the barbs 65 to stabilize the wires, reducing the possibility of the wires coming loose when they are installed on the wiring board 5 under external force, which could lead to the fuse voltage limiter breaking contact. This improves the stability of the voltage limiter during use to a certain extent.

[0041] Take out a clean, breathable covering cloth 73 and lay it flat on the surface of the moving frame 72. Place both sides of the covering cloth 73 onto the surfaces of the two rows of barbs 65 to initially secure it. Pull the sliding rod 77, which will move the push plate 78. Place the protrusions 79 on the push plate 78 onto the long sides of the covering cloth 73. The herringbone structure of the protrusions 79 improves the stability of securing the two long sides of the covering cloth 73. Then, rotate the screw 74 inside the protrusion 75. The screw 74 will cause the moving frame 72 to slide on the surface of the protrusion frame 71, thus securing the covering cloth 73 to the surface of the protrusion frame 71. The tightening and fixing work facilitates the stable covering of the heat dissipation holes on the side of the outer casing 1, reducing the possibility of dirt and grime accumulating on the inner wall of the heat dissipation holes. This reduces the risk of dirt and grime falling into the inner wall of the outer casing 1 and affecting the equipment components if swept forcefully. By setting the cover 73 and the side wall of the outer casing 1 to be flexible and detachable, the cover 73 can be easily replaced, maintaining the permeability of the cover 73 at the heat dissipation hole position and further ensuring the normal heat dissipation of the outer casing 1. By setting the protective structure 7, the flexible covering of the cover 73 on the side of the outer casing 1 is facilitated, maintaining the permeability of the heat dissipation hole position on the side of the outer casing 1 and further improving the heat dissipation effect of the outer casing 1.

[0042] When control button 3 needs to be operated, pull ring 88 will cause rotating block 83 to rotate outside of limit frame 82, thus driving rotating block 83 to rotate. At this time, rotating block 83 will press on control button 3, thereby realizing the operation of control button 3. By setting the cover frame 81, the control button 3 is covered, reducing the possibility of accidental touch due to external force. By setting roller 86, the friction of rotating block 83 on control button 3 is reduced, further improving the stability of control button 3 during operation. The plastic sheet 84 facilitates the covering of the surface of control button 3, reducing the possibility of damage to the lettering due to pressure, and facilitating the protection of control button 3. By setting the anti-accidental touch structure 8, the cover frame 81 is convenient for covering control button 3. By setting rotating block 83 to apply pressure to control button 3, the anti-accidental touch work of control button 3 is reduced, improving the accuracy of control button 3 operation.

[0043] It should be noted that, in this document, relational terms such as "first" and "second" are used only 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 process, method, article, or apparatus.

[0044] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A fusible controllable pressure limiting device, comprising a housing (1), characterized in that: A fuse (2) is fixedly installed on the inner wall of the housing (1). Several control buttons (3) are uniformly and electrically installed on the upper surface of the housing (1). A display (4) is fixedly installed on the upper surface of the housing (1). A wiring board (5) is fixedly installed on the side wall of the housing (1). The housing (1) also includes a stabilizing structure (6) provided on the side wall of the housing (1) to reinforce and prevent the wires installed on the wiring board (5) from falling off; a protective structure (7) provided on the side wall of the housing (1) to temporarily cover the heat dissipation holes opened on the housing (1); and an anti-accidental touch structure (8) provided on the upper surface of the housing (1) to prevent accidental touch of the control button (3) from causing malfunction of the pressure limiting device. The stabilizing structure (6) includes two connecting rods (61) fixedly installed on the side wall of the outer shell (1). A rectangular frame (62) is fixedly installed at one end of the two connecting rods (61) that is close to each other. The surface of the rectangular frame (62) is provided with a limiting structure (63) to prevent the wire from shaking and an anti-detachment structure (64) to prevent the wire from falling off the wiring board (5) under external force. The anti-detachment structure (64) includes two connecting plates (644) fixedly installed on the surface of the rectangular frame (62) and barbs (65) to stabilize the wire. The outer side of the barbs (65) is an arc surface structure. A circular rod is rotatably installed on one side of the two connecting plates (644) that is close to each other. A rotating plate (649) is fixedly installed on the side wall of the circular rod. A sliding frame (643) is slidably inserted inside the rotating plate (649). A pressure plate (641) is fixedly installed on the lower side of 43). The two ends of the pressure plate (641) are bent. The six barbs (65) are fixedly installed in groups of three on the inner side of the two pressure plates (641). A spring (647) is fixedly installed on the side of the rotating plate (649) and the pressure plate (641) that are close to each other. A connecting frame (645) with a "T" shaped cross section is fixedly installed on the side of the two connecting plates (644) that are close to each other. An elastic rope (642) is fixedly installed on the side of the connecting frame (645) and the rotating plate (649) that are close to each other. A positioning block (648) is fixedly installed on the side wall of the round rod. A pin (646) slides through the inside of the positioning block (648). A hole is opened on the surface of the connecting plate (644). The size of the hole is compatible with the size of the pin (646). The protective structure (7) includes a cover (73) for covering the sidewalls of the outer shell (1). The anti-accidental touch structure (8) includes a "U" shaped limit frame (82) fixedly installed on the surface of the outer shell (1), and a rotating block (83) is rotatably installed on the surface of the limit frame (82).

2. The fusible controllable voltage limiting device according to claim 1, characterized in that: The limiting structure (63) comprises two fixing rods (634) fixedly mounted on the surface of a rectangular frame (62), a limiting cylinder (631) is fixedly mounted at an end where the two fixing rods (634) are close to each other, a side of the limiting cylinder (631) away from the fixing rods (634) is of a hollow truncated cone structure, two limiting frames (632) are slidably mounted inside the limiting cylinder (631), a notch with a V-shaped cross-section is formed on one side of the limiting frame (632), one side of the limiting frame (632) is provided with an arc surface, a driving rod (633) is threaded through the interior of the limiting cylinder (631), and the driving rod (633) is rotatably connected to the interior of the limiting frame (632).

3. The fusible controllable voltage limiting device according to claim 1, characterized in that: The protective structure (7) further comprises a convex frame (71) fixedly mounted on the side wall of an outer casing (1), a moving frame (72) is slidably mounted on the surface of the convex frame (71), a plurality of barbs (76) are uniformly and fixedly mounted on the side wall of the moving frame (72), and a shielding cloth (73) is sleeved on the surfaces of the plurality of barbs (76).

4. The fusible controllable voltage limiting device according to claim 3, characterized in that: A convex block (75) is fixedly mounted on the surface of the outer casing (1), a screw rod (74) is threaded through the interior of the convex block (75), and the screw rod (74) is rotatably connected to the interior of the moving frame (72).

5. A fusible controllable voltage limiting device according to claim 4, characterized in that: A sliding rod (77) with a U-shaped cross-section is slidably threaded through the interior of the moving frame (72), a push plate (78) is fixedly mounted at an end of the sliding rod (77) located inside the moving frame (72), a plurality of convex spines (79) are uniformly and fixedly mounted on the surface of the push plate (78), and the cross-section of the convex spine (79) is herringbone-shaped.

6. The fusible controllable voltage limiting device according to claim 1, characterized in that: The anti-false-touch structure (8) further comprises a shielding frame (81) fixedly mounted on the surface of the outer casing (1) outside a control button (3), a notch is formed on the surface of the shielding frame (81), a pull block (87) is fixedly mounted on the surface of a rotating block (83), and a pull ring (88) is rotatably mounted on an inner wall of the pull block (87).

7. A fusible controllable voltage limiting device according to claim 6, characterized in that: A rotating rod (85) is rotatably mounted inside the rotating block (83), and a roller (86) is fixedly mounted on a side wall of the rotating rod (85).

8. A fusible controllable voltage limiting device according to claim 6, characterized in that: A plastic sheet (84) is adhesively bonded on the surface of the control button (3), and the plastic sheet (84) is made of acrylic plate material.

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