An overload emergency protection device for power distribution cabinet

Abstract

The present invention relates to the field of power distribution cabinets, and discloses an overload emergency protection device for a power distribution cabinet, comprising a cabinet body and an overload protection mechanism, the overload protection mechanism comprising a mounting bracket, a line assembly, a protection assembly, a controller and an ammeter, the line assembly comprising two line components, the line component comprising a mounting seat slidably arranged on the mounting bracket along a vertical direction, a first spring being provided on each of the two mounting seats on opposite sides, a touch plate being provided on each of the two mounting seats on opposite sides, a third line being provided between the two touch plates, a first circuit connector being provided on each of the two mounting seats on opposite sides, a conductive connection being achieved between the touch plate in the line component and the first circuit connector via the first line, a second line being provided at the end of the first circuit connector of any line component, a second circuit connector being provided at the end of the second line, a coil being provided on the outside of the second circuit, and the coil being connected to the ammeter.

Description

Technical Field

[0001] The present invention relates to the field of power distribution cabinets, in particular to the field of power distribution cabinet protection, and in particular to an overload emergency protection device for a power distribution cabinet. Background Art

[0002] The distribution cabinet is divided into power distribution cabinet, lighting distribution cabinet and metering cabinet. It is the final equipment of the distribution system and the general term for the motor control center. During use, the distribution cabinet may be overloaded, so it is generally necessary to set an overload protector. The overload protector is when the current is overloaded. The excessive current will increase the line temperature, and the bimetallic strip of the overload protector will deform due to heat. The deformation action causes the bimetallic strip to push the moving spring, separating the moving contact from the static contact, disconnecting the circuit, and achieving the protection purpose. However, the load of some electrical equipment changes frequently, which can easily cause frequent deformation of the bimetallic strip, easily lead to bouncing fatigue of the bimetallic strip, and failure of the protector.

[0003] Based on the above, after searching, the Chinese invention patent application with application publication number CN107301936A was found, which discloses a current overload protector structure. When the current is too large, the heat generated by the heating wire of the thermal fuse is transferred to the bimetallic strip, causing the bimetallic strip to deform due to heat, so that the overload protection structure is triggered, cutting off the circuit and achieving the purpose of overload protection. However, this method has some shortcomings. For example: its essence is still to achieve overload protection through the thermal deformation of the bimetallic strip, and the bimetallic strip still has the problem of bouncing fatigue; the fuse needs to be manually replaced after it is blown, which is more troublesome; the critical value when overload protection occurs is a fixed value, and the critical value varies depending on the different electrical equipment connected to the distribution cabinet. Therefore, if the existing technology needs to adjust the critical value, then the bimetallic strip needs to be replaced, which needs to be improved.

[0004] Based on the above, the present invention proposes an overload emergency protection device for a power distribution cabinet. Summary of the Invention

[0005] In order to solve the problems mentioned in the above background, the present invention provides an overload emergency protection device for a power distribution cabinet.

[0006] In order to achieve the above technical objectives, the technical solutions adopted by the present invention are as follows.

[0007] An overload emergency protection device for a power distribution cabinet includes a cabinet body and an overload protection mechanism disposed in the cabinet body. The overload protection mechanism includes a mounting bracket, a line assembly, a protection assembly, a controller, and an ammeter. The line assembly includes a line component. Two line components are disposed in a vertical direction.

[0008] The circuit component includes a mounting seat that is slidably arranged on a mounting bracket along a vertical direction and a first spring for driving the mounting seat to move. The first springs in the two circuit components are arranged on the opposite sides of the mounting seats in the two circuit components. A touch plate is respectively provided on the opposite sides of the mounting seats in the two circuit components. The touch plate is made of conductive material. A third circuit is provided between the touch plates in the two circuit components. A first circuit connector is respectively provided on the opposite sides of the mounting seats in the two circuit components. A conductive connection is achieved between the touch plate in the circuit component and the first circuit connector through the first circuit. A second circuit is provided at the end of the first circuit connector of any circuit component, and a second circuit connector is provided at the end of the second circuit. A coil is provided on the outside of the second circuit, and the coil is connected to the ammeter.

[0009] As a further improvement and optimization of the present invention, the third circuit includes an insulating sleeve and a wire core arranged in the insulating sleeve. Initially, two ends of the wire core are in conductive contact with the two touch plates respectively.

[0010] As a further improvement and optimization of the present invention, the ammeter includes a pointer and a mounting ring, a touch rod extends from the end face of the mounting ring, the touch rod is made of conductive material, the mounting ring is made of insulating material, when the pointer is deflected, it can contact the touch rod and the pointer is made of conductive material, an insulating layer is provided at the connection between the pointer and the ammeter, a signal generator is connected in series between the pointer and the touch rod, when the pointer contacts the touch rod, the signal generator is energized and sends a signal to the controller, and the controller sends an instruction to the protection component.

[0011] As a further improvement and optimization of the present invention, the mounting ring can rotate around its own axis, and the axis of the mounting ring coincides with the axis of the pointer deflection trajectory.

[0012] As a further improvement and optimization of the present invention, a knob is provided on the housing of the ammeter, and a power connection is achieved between the knob and the mounting ring via a power connector.

[0013] As a further improvement and optimization of the present invention, the protection component includes a movable bracket mounted on the mounting bracket for sliding in a horizontal direction and a linear module for driving the movable bracket to move. The third line is connected to the movable bracket, and a protection unit is provided on the movable bracket.

[0014] As a further improvement and optimization of the present invention, the protection unit includes a vertically arranged outer cylindrical shell, one end of the outer cylindrical shell is open and provided with an end cover, and the other end is closed and provided with a through hole, the end covers on the two outer cylindrical shells are coaxially connected, a piston is provided inside the outer cylindrical shell, a push rod extends from the end surface of the piston, and the end of the push rod is located in the through hole, a second spring is provided between the piston and the closed end of the outer cylindrical shell, and a thermal expansion medium is provided in the area between the piston and the end cover. The outer cylindrical shell of the protection component is made of conductive material, and the two ends of the third circuit are respectively flush with the closed ends of the two outer cylindrical shells.

[0015] As a further improvement and optimization of the present invention, a limiting assembly is provided at the closed end of the outer cylinder shell, and the limiting assembly includes a card groove provided on the outer cylindrical surface of the ejector rod and a mounting groove provided on the outer cylindrical surface of the closed end of the outer cylinder shell. A bayonet is provided in the mounting groove, and a bypass opening for avoiding the ejector rod is provided on the bayonet pin. A third spring is provided between the bayonet pin and the bottom of the mounting groove. Initially, the third spring is in a compressed state. During the process of thermal expansion medium thermally expanding and pushing the piston and the ejector rod, the card groove can face the hole wall of the bypass opening and the elastic force of the third spring is released to enable the hole wall of the bypass opening to be inserted into the card groove.

[0016] As a further improvement and optimization of the present invention, a protruding rod is provided on the mounting bracket, and a slope is provided at the end of the protruding rod. When the protection unit moves away from the touch plate, the end of the pin extending out of the mounting slot can come into contact with the slope, and the slope can push the pin to move closer to the bottom of the mounting slot.

[0017] As a further improvement and optimization of the present invention, both side surfaces of the touch panel along the movement direction of the movable bracket are configured to be arc-shaped, and the corresponding arc surfaces on the two touch panels are bent toward opposite sides.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. In this solution, when the power distribution cabinet is in normal use, the protection component that performs overload protection does not form a conductive connection with the line component. Therefore, the line component is equivalent to a wire. That is, there is no overload protection structure in the circuit between the power distribution cabinet, the power supply, and the electrical equipment. Therefore, the circuit is not subject to any interference from the overload protection structure. In the prior art, overload protectors are generally set in series in the circuit. The resistance value of the overload protector is greater than the resistance value of the wire, thus generating additional energy consumption. In contrast, in this solution, such additional energy consumption does not exist.

[0020] 2. In this solution, when the current of the distribution cabinet is about to reach the critical value of overload protection, the pointer of the ammeter contacts the touch rod, the signal generator is energized and sends a signal to start the linear module of the protection component, driving the movable bracket to move, thereby pushing the protection unit to the two contact plates of the line component, and starting the overload trigger protection, that is, the overload protection performance is not affected, and on this basis: on the one hand, the medium for overload triggering is a thermal expansion medium, compared with the bimetallic strip in the prior art, there is no problem of bouncing fatigue, the service life is longer, and the use is more reliable. On the other hand, after the overload protection occurs, the staff performs circuit maintenance , there is no need to manually reset the overload protection structure, you only need to press the corresponding button to make the controller issue the corresponding command to achieve automatic reset of the overload protection structure, which is more convenient to use. On the one hand, when overload protection occurs, it means that the current passing through the line component exceeds the preset value and is very large. At this time, this solution is to achieve circuit breaking by pushing the touch plate to move through the push rod. The separation of the conductive contact between the touch plate and the outer cylinder shell is instantaneous, so no electric spark phenomenon will be generated. On the other hand, in the prior art, the disconnection of the moving contact and the static contact is similar to that of a knife switch, which is a little bit of contact separation, and electric spark phenomenon is prone to occur under high current conditions;

[0021] 3. In this solution, the position of the pointer can be changed by changing the position of the touch rod, thereby changing the position of the pointer when the pointer contacts the touch rod, that is, changing the triggering condition of the protection component, which is equivalent to changing the critical value of the overload protection triggering of the distribution cabinet. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The structure of the present invention is schematically shown Figure 1 ;

[0023] Figure 2 The structure of the present invention is schematically shown Figure 2 ;

[0024] Figure 3 Schematic diagram of the overload protection mechanism Figure 1 ;

[0025] Figure 4 Schematic diagram of the overload protection mechanism Figure 2 ;

[0026] Figure 5 Schematic diagram of line components and protection components Figure 1 ;

[0027] Figure 6 Schematic diagram of line components and protection components Figure 2 ;

[0028] Figure 7 Schematic diagram of line components and protection components Figure 3 ;

[0029] Figure 8 is a schematic diagram of the circuit components;

[0030] Figure 9 is a schematic diagram of an ammeter;

[0031] Figure 10 A schematic diagram of the protection component;

[0032] Figure 11 A cross-sectional view of the protection unit.

[0033] The reference numerals in the accompanying drawings are:

[0034] 100, cabinet; 200, overload protection mechanism; 201, mounting bracket; 202, circuit assembly; 2021, first circuit connector; 2022, first circuit; 2023, touch panel; 2024, mounting base; 2025, first spring; 2026, second circuit connector; 2027, second circuit; 2028, coil; 2029, third circuit; 203, protection assembly; 2031, movable bracket ; 2032, linear module; 2033, protruding rod; 2034, protection unit; 204, controller; 205, ammeter; 2051, pointer; 2052, mounting ring; 2053, touch rod; 2054, knob; 2055, power connection; 206, outer cylinder shell; 207, piston; 208, push rod; 2081, slot; 209, second spring; 210, bayonet pin; 211, third spring. DETAILED DESCRIPTION

[0035] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0036] Reference Figures 1-11 , an overload emergency protection device for a distribution cabinet, including a cabinet body 100 and an overload protection mechanism 200 arranged in the cabinet body 100.

[0037] The overload protection mechanism 200 includes a mounting bracket 201 , on which a circuit component 202 , a protection component 203 , a controller 204 and an ammeter 205 are mounted.

[0038] Line component 202: refer to Figure 8 and Figure 10 The line assembly 202 includes a line component, and two line components are arranged in the vertical direction.

[0039] The circuit components include a mounting seat 2024 slidably arranged on the mounting bracket 201 along the vertical direction and a first spring 2025 for driving the mounting seat 2024 to move. The first springs 2025 in the two circuit components are arranged on the opposite side of the mounting seat 2024 in the two circuit components.

[0040] A contact plate 2023 is provided on each of the facing sides of the mounting base 2024 in the two circuit components. The contact plate 2023 is made of conductive material, such as copper. The mounting base 2024, the mounting bracket 201 and the first spring 2025 are made of insulating material or have an insulating layer on the surface.

[0041] A third circuit 2029 is provided between the contact plates 2023 in the two circuit components. Furthermore, due to the presence of the first spring 2025, the upper and lower ends of the third circuit 2029 are subjected to force. Therefore, the third circuit 2029 may include an insulating sleeve and a wire core arranged in the insulating sleeve. The two ends of the wire core are respectively in conductive contact with the two contact plates 2023, and the insulating sleeve serves as a supporting medium.

[0042] A first circuit connector 2021 is provided on each of the two circuit components on opposite sides of the mounting base 2024 , and a conductive connection is achieved between the touch panel 2023 in the circuit component and the first circuit connector 2021 via the first circuit 2022 .

[0043] In the two circuit components, a connecting component is provided at the end of the first circuit connector 2021 of any one of the circuit components. In this solution, the connecting component is provided on the lower circuit component.

[0044] The connecting component includes a second circuit connector 2026 and a second circuit 2027 provided between the second circuit connector 2026 and the first circuit connector 2021 . A coil 2028 is provided outside the second circuit 2027 , and the coil 2028 is connected to the ammeter 205 .

[0045] When the circuit assembly 202 is in normal use, the second circuit connector 2026 and the first circuit connector 2021 of another circuit component are connected to the power supply and the power-consuming device respectively. Of course, other existing electrical components are included in the connection route. This is achievable in the existing technology and will not be described in detail.

[0046] When the circuit assembly 202 is in normal use, the second circuit connector 2026, the second circuit 2027, the first circuit connector 2021 in one circuit component, the first circuit 2022 and the touch pad 2023, the third circuit 2029, the touch pad 2023 in another circuit component, the first circuit 2022 and the first circuit connector 2021 are in a series relationship, equivalent to a single wire.

[0047] In addition, when alternating current is passed through the second circuit 2027, a magnetic field is generated, so the coil 2028 will generate a small current. This is achievable with existing technology and will not be elaborated on. The current of the coil 2028 is monitored by the ammeter 205, and the current passing through the second circuit 2027 can be indirectly calculated based on the monitored value. Therefore, the pointer 2051 of the ammeter 205 displays the current passing through the second circuit 2027, that is, the current passing through the distribution cabinet. This current detection technology is achievable with existing technology and will not be elaborated on.

[0048] Ammeter 205: Reference Figure 9 The ammeter 205 includes a pointer 2051 and a mounting ring 2052. The mounting ring 2052 can rotate around its own axis. The axis of the mounting ring 2052 coincides with the axis of the deflection trajectory of the pointer 2051. A touch rod 2053 extends from the end face of the mounting ring 2052. The touch rod 2053 is made of conductive material, and the mounting ring 2052 is made of insulating material. When the pointer 2051 deflects, it can contact the touch rod 2053. The pointer 2051 is made of conductive material. It should be noted that an insulating layer is provided at the connection between the pointer 2051 and the ammeter 205. Therefore, the pointer 2051 will only match the scale value of the ammeter 205. The value of the test result is displayed without interfering with the use of the ammeter 205. In addition, the pointer 2051 and the touch rod 2053 are respectively connected to the signal generator through wires. The pointer 2051 and the touch rod 2053 are equivalent to a switch. When the pointer 2051 and the touch rod 2053 come into contact, it is equivalent to the switch being closed, the signal generator is energized, and a signal is sent to the controller 204. The controller 204 sends an instruction to the protection component 203. It should be noted that when the pointer 2051 and the touch rod 2053 come into contact, the scale value corresponding to the position of the pointer 2051 is slightly smaller than the maximum current value of the distribution cabinet, that is, slightly smaller than the critical value of the overload trigger.

[0049] Furthermore, a knob 2054 is provided on the housing of the ammeter 205, and a power connection is achieved between the knob 2054 and the mounting ring 2052 via a power connector 2055. The significance of this is that the position of the touch rod 2053 can be changed by the knob 2054, thereby changing the position of the pointer 2051 when the pointer 2051 contacts the touch rod 2053, that is, changing the trigger value when the protection component 203 is activated.

[0050] Protection component 203: Refer to Figure 10 and Figure 11The protection component 203 includes a movable bracket 2031 that is slidably installed on the mounting bracket 201 along the horizontal direction and a linear module 2032 for driving the movable bracket 2031 to move. The linear module 2032 can be an electric telescopic rod technology or an existing screw linear motion technology. When the signal generator is powered on and sends a signal to the controller 204, the controller 204 sends an instruction to the protection component 203, thereby starting the linear module 2032 and driving the movable bracket 2031 to move. The movable bracket 2031 moves with the protection unit 2034, so that the protection unit 2034 is close to the touch plate 2023.

[0051] The third line 2029 is connected to the movable bracket 2031 , and a protection unit 2034 is provided on the movable bracket 2031 . When the protection unit 2034 moves along with the movable bracket 2031 , the protection unit 2034 can pass through the area between the contact plates 2023 in the two line components.

[0052] The protection unit 2034 includes a vertically arranged outer cylindrical shell 206 , one end of the outer cylindrical shell 206 is open and provided with an end cover, and the other end is closed and provided with a through hole. The end covers on the two outer cylindrical shells 206 are coaxially connected.

[0053] A piston 207 is sleeved in the outer cylindrical shell 206, and a push rod 208 extends from the end surface of the piston 207. The end of the push rod 208 is located in the through hole. A second spring 209 is provided between the piston 207 and the closed end of the outer cylindrical shell 206, and a thermal expansion medium is provided in the area between the piston 207 and the end cover.

[0054] A limit assembly is provided at the closed end of the outer cylindrical shell 206, which includes a slot 2081 provided on the outer circumferential surface of the ejector pin 208 and a mounting slot provided on the outer circumferential surface of the closed end of the outer cylindrical shell 206. A bayonet 210 is sleeved in the mounting slot, and a bypass opening for avoiding the ejector pin 208 is provided on the bayonet 210. A third spring 211 is provided between the bayonet 210 and the bottom of the mounting slot. Initially, the third spring 211 is in a compressed state, and the hole wall of the bypass opening contacts the ejector pin 208. When the thermal expansion medium expands and pushes the piston 207 and the ejector pin 208 to move, when the slot 2081 is facing the hole wall of the bypass opening, the third spring 211 releases its elastic force, enabling the hole wall of the bypass hole to be inserted into the slot 2081, thereby limiting the movement of the ejector pin 208.

[0055] The outer cylindrical shell 206 of the protection component 203 is made of conductive material, and the rest is made of insulating material or has an insulating layer on the outer surface.

[0056] Further, refer to Figure 10A protruding rod 2033 is provided on the mounting bracket 201, and a slope is provided at the end of the protruding rod 2033. When the protection unit 2034 moves away from the touch plate 2023, the end of the latch 210 extending out of the mounting slot can come into contact with the slope. In this way, the latch 210 can be pushed to move closer to the bottom of the mounting slot, thereby removing the restriction on the top rod 208, and the second spring 209 can release the elastic force to reset the protection unit 2034.

[0057] Further, refer to Figure 8 The touch panels 2023 are arranged in an arc shape at both ends along the movement direction of the movable bracket 2031. The arc surfaces on the two touch panels 2023 are bent toward opposite sides. The purpose is to facilitate the protection unit 2034 and the third circuit 2029 to enter and exit the area between the two touch panels 2023.

[0058] Working principle of the present invention:

[0059] During normal operation, third line 2029 is located between two contact plates 2023. Line assembly 202 is equivalent to a single wire, and normal operation of the power distribution cabinet is not affected. Ampere meter 205 monitors the current flowing through line assembly 202 in real time. When the current is about to reach the critical value for triggering an overload, pointer 2051 contacts contact rod 2053, energizing the signal generator and sending a signal to controller 204. Controller 204 issues a command to protection assembly 203, activating linear module 2032 and driving movable bracket 2031 to move. Movable bracket 2031, along with protection unit 2034, moves along with third line 2029. During this process:

[0060] Initially, the third line 2029 does not leave the area between the two contact pads 2023 and remains conductively connected, so there is no disconnection. Subsequently, the protection component 203 enters the area between the two contact pads 2023. The closed ends of the two outer cylindrical shells 206 made of conductive material in the protection component 203 respectively form conductive contact with the two contact pads 2023. The outer cylindrical shells 206 and the third line 2029 are connected in parallel, so there is no disconnection. Subsequently, the third line 2029 leaves the area between the two contact pads 2023. In the area between the two contact plates 2023, only the outer cylindrical shell 206 remains as the conductive medium between the two contact plates 2023. Since the outer cylindrical shell 206 has a relatively large resistance, it generates heat when energized, causing the thermal expansion medium to expand, pushing against the piston 207 and the push rod 208. When the overload lasts for a period of time, such as half a minute, the push rod 208 contacts the contact plates 2023. The two push rods 208 push against the two contact plates 2023, causing the outer cylindrical shell 206 and the contact plates 2023 to break contact, resulting in a circuit breaker and achieving overload protection.

[0061] When overload protection occurs, the movement of the push rod 208 is restricted by the limit assembly. Therefore, even after a period of time, the thermal expansion medium recovers and the circuit breaker is not cancelled. At this time, after the user completes the relevant circuit maintenance, he actively uses the existing technology to make the controller 204 send an instruction to the protection component 203, so that the linear module 2032 drives the movable bracket 2031 to move in the opposite direction, so that the third line 2029 returns to between the two contact plates 2023, and the protection unit 2034 returns to the initial position. During the return process, the limit assembly cancels the restriction on the push rod 208 through the inclined surface of the protruding rod 2033, thereby resetting the protection unit 2034.

[0062] From the above description we can see that:

[0063] 1. In this solution, when the power distribution cabinet is in normal use, the protection component that performs overload protection does not form a conductive connection with the line component. Therefore, the line component is equivalent to a wire. That is, there is no overload protection structure in the circuit between the power distribution cabinet, the power supply, and the electrical equipment. Therefore, the circuit is not subject to any interference from the overload protection structure. In the prior art, overload protectors are generally set in series in the circuit. The resistance value of the overload protector is greater than the resistance value of the wire, thus generating additional energy consumption. In contrast, in this solution, such additional energy consumption does not exist.

[0064] 2. In this solution, when the current of the distribution cabinet is about to reach the critical value of overload protection, the pointer of the ammeter contacts the touch rod, the signal generator is energized and sends a signal to start the linear module of the protection component, driving the movable bracket to move, thereby pushing the protection unit to the two contact plates of the line component, and starting the overload trigger protection, that is, the overload protection performance is not affected, and on this basis: on the one hand, the medium for overload triggering is a thermal expansion medium, compared with the bimetallic strip in the prior art, there is no problem of bouncing fatigue, the service life is longer, and the use is more reliable. On the other hand, after the overload protection occurs, the staff performs circuit maintenance , there is no need to manually reset the overload protection structure, you only need to press the corresponding button to make the controller issue the corresponding command to achieve automatic reset of the overload protection structure, which is more convenient to use. On the one hand, when overload protection occurs, it means that the current passing through the line component exceeds the preset value and is very large. At this time, this solution is to achieve circuit breaking by pushing the touch plate to move through the push rod. The separation of the conductive contact between the touch plate and the outer cylinder shell is instantaneous, so no electric spark phenomenon will be generated. On the other hand, in the prior art, the disconnection of the moving contact and the static contact is similar to that of a knife switch, which is a little bit of contact separation, and electric spark phenomenon is prone to occur under high current conditions;

[0065] 3. In this solution, the position of the pointer can be changed by changing the position of the touch rod, thereby changing the position of the pointer when the pointer contacts the touch rod, that is, changing the triggering condition of the protection component, which is equivalent to changing the critical value of the overload protection triggering of the distribution cabinet.

[0066] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can, without departing from the scope of the technical solution of the present invention, make some changes or modifications to equivalent embodiments using the technical contents disclosed above. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. An overload emergency protection device for a power distribution cabinet, comprising a cabinet body (100) and an overload protection mechanism (200) arranged in the cabinet body (100), characterized in that: The overload protection mechanism (200) comprises a mounting bracket (201), a circuit assembly (202), a protection assembly (203), a controller (204), and an ammeter (205); the circuit assembly (202) comprises a circuit component, and two circuit components are arranged in a vertical direction; The circuit component comprises a mounting seat (2024) slidably arranged on a mounting bracket (201) in a vertical direction and a first spring (2025) for driving the mounting seat (2024) to move, wherein the first springs (2025) in the two circuit components are arranged on opposite sides of the mounting seats (2024) in the two circuit components, and a touch plate (2023) is respectively arranged on the opposite sides of the mounting seats (2024) in the two circuit components, and the touch plate (2023) is made of a conductive material. A third circuit (2029) is arranged between the touch plates (2023) in the two circuit components, and the two A first circuit connector (2021) is provided on opposite sides of the mounting seat (2024) in the circuit component; a conductive connection is achieved between the touch panel (2023) in the circuit component and the first circuit connector (2021) via a first circuit (2022); a second circuit (2027) is provided at the end of the first circuit connector (2021) of any circuit component; a second circuit connector (2026) is provided at the end of the second circuit (2027); a coil (2028) is provided outside the second circuit (2027); and the coil (2028) is connected to the ammeter (205); The ammeter (205) comprises a pointer (2051) and a mounting ring (2052); a touch rod (2053) extends from the end surface of the mounting ring (2052); the touch rod (2053) is made of a conductive material; the mounting ring (2052) is made of an insulating material; when the pointer (2051) deflects, it can contact the touch rod (2053); the pointer (2051) is made of a conductive material; an insulating layer is provided at the connection between the pointer (2051) and the ammeter (205); a signal generator is connected in series between the pointer (2051) and the touch rod (2053); when the pointer (2051) contacts the touch rod (2053), the signal generator is energized and sends a signal to the controller (204); and the controller (204) sends an instruction to the protection component (203); The protection assembly (203) comprises a movable bracket (2031) slidably mounted on the mounting bracket (201) in a horizontal direction, and a linear module (2032) for driving the movable bracket (2031) to move. The third line (2029) is connected to the movable bracket (2031), and a protection unit (2034) is provided on the movable bracket (2031). The protection unit (2034) includes a vertically arranged outer cylindrical shell (206), one end of the outer cylindrical shell (206) is open and provided with an end cap, and the other end is closed and provided with a through hole. The end caps on the two outer cylindrical shells (206) are coaxially connected. A piston (207) is sleeved inside the outer cylindrical shell (206), and a push rod (208) extends from the end surface of the piston (207). The end of the push rod (208) is located in the through hole. A second spring (209) is provided between the piston (207) and the closed end of the outer cylindrical shell (206). A thermal expansion medium is provided in the area between the piston (207) and the end cap. The outer cylindrical shell (206) of the protection component (203) is made of a conductive material, and the two ends of the third circuit (2029) are respectively flush with the closed ends of the two outer cylindrical shells (206).

2. The overload emergency protection device for a power distribution cabinet according to claim 1, characterized in that: The third circuit (2029) comprises an insulating sleeve and a wire core arranged in the insulating sleeve. Initially, two ends of the wire core are in conductive contact with the two contact plates (2023) respectively.

3. The overload emergency protection device for a power distribution cabinet according to claim 1, characterized in that: The mounting ring (2052) can rotate around its own axis, and the axis of the mounting ring (2052) coincides with the axis of the deflection trajectory of the pointer (2051).

4. The overload emergency protection device for a power distribution cabinet according to claim 3, characterized in that: A knob (2054) is provided on the housing of the ammeter (205), and a power connection is achieved between the knob (2054) and the mounting ring (2052) via a power connector (2055).

5. The overload emergency protection device for a power distribution cabinet according to claim 1, characterized in that: A limiting assembly is provided at the closed end of the outer cylindrical shell (206), the limiting assembly comprising a clamping groove (2081) provided on the outer circumferential surface of the ejector rod (208) and a mounting groove provided on the outer circumferential surface of the closed end of the outer cylindrical shell (206), a clamping pin (210) being sleeved in the mounting groove, a bypass opening for bypassing the ejector rod (208) being provided on the clamping pin (210), a third spring (211) being provided between the clamping pin (210) and the bottom of the mounting groove, initially, the third spring (211) is in a compressed state, and in the process of the thermal expansion medium thermally expanding and pushing the piston (207) and the ejector rod (208), the clamping groove (2081) can face the hole wall of the bypass opening, and the elastic force of the third spring (211) is released to enable the hole wall of the bypass opening to be inserted into the clamping groove (2081).

6. The overload emergency protection device for a power distribution cabinet according to claim 5, characterized in that: A protruding rod (2033) is provided on the mounting bracket (201), and a slope is provided at the end of the protruding rod (2033). When the protection unit (2034) moves away from the touch plate (2023), the end of the latch (210) extending out of the mounting groove can come into contact with the slope, and the slope can push the latch (210) to move closer to the bottom of the mounting groove.

7. The overload emergency protection device for a power distribution cabinet according to claim 1, characterized in that: Both side surfaces of the touch panel (2023) along the movement direction of the movable bracket (2031) are arranged in an arc shape, and the corresponding arc surfaces on the two touch panels (2023) are bent toward opposite sides.

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