Overload emergency protection device for power distribution cabinet

Abstract

The invention relates to the field of power distribution cabinets, and discloses an overload emergency protection device for a power distribution cabinet, which comprises a cabinet body and an overload protection mechanism, the overload protection mechanism comprises a mounting bracket, a circuit assembly, a protection assembly, a controller and an ampere meter, and the circuit assembly comprises two circuit parts. The circuit component comprises mounting seats which are slidably arranged on the mounting bracket in the vertical direction, the opposite sides of the two mounting seats are each provided with a first spring, the opposite sides of the two mounting seats are each provided with a touch plate, a third circuit is arranged between the two touch plates, and the third circuit is connected with the first spring; the sides, opposite to each other, of the two mounting bases are each provided with a first circuit connector, the touch panels in the circuit components are electrically connected with the first circuit connectors through first circuits, the tail end of the first circuit connector of any circuit component is provided with a second circuit, and the tail end of the second circuit is provided with a second circuit connector. And a coil is arranged outside the second circuit and is connected with the ampere meter.

Description

Technical Field

[0001] The invention relates to the field of power distribution cabinets, specifically to the field of power distribution cabinet protection, and particularly 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 an overload protector is generally required. 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 double-strip bounce fatigue, and fail the protector.

[0003] Based on the above, after searching, a 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 electrical equipment connected to the distribution cabinet. Therefore, if the prior art 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 solution adopted by the present invention is as follows.

[0007] An overload emergency protection device for a power distribution cabinet comprises a cabinet body and an overload protection mechanism arranged in the cabinet body, wherein the overload protection mechanism comprises a mounting bracket, a line assembly, a protection assembly, a controller and an ammeter, wherein the line assembly comprises a line component, and two line components are arranged in a vertical direction;

[0008] The circuit component includes a mounting seat 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 side of the mounting seat in the two circuit components, a touch plate is respectively arranged on the opposite side of the mounting seat in the two circuit components, and the touch plate is made of conductive material, a third circuit is arranged between the touch plates in the two circuit components, a first circuit connector is respectively arranged on the opposite side of the mounting seat in the two circuit components, and 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 arranged at the end of the first circuit connector of any circuit component, a second circuit connector is arranged at the end of the second circuit, a coil is arranged outside 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, and 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 slidably installed on the mounting bracket 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 arranged on the movable bracket.

[0014] As a further improvement and optimization of the present invention, the protection unit includes a vertically arranged outer cylinder shell, one end of the outer cylinder 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 cylinder shells are coaxially connected, a piston is sleeved inside the outer cylinder 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 arranged between the piston and the closed end of the outer cylinder shell, a thermal expansion medium is arranged in the area between the piston and the end cover, the outer cylinder 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 cylinder 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 slot arranged on the outer cylindrical surface of the ejector rod and an installation groove arranged on the outer cylindrical surface of the closed end of the outer cylinder shell, a bayonet is sleeved in the installation groove, and a bypass opening for avoiding the ejector rod is arranged on the bayonet, and a third spring is arranged between the bayonet and the bottom of the installation groove. Initially, the third spring is in a compressed state. During the process of thermal expansion medium undergoing thermal expansion and pushing the piston and the ejector rod, the slot can face the hole wall of the bypass opening and the elastic force of the third spring can be released to enable the hole wall of the bypass opening to be inserted into the slot.

[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 groove can come into contact with the slope, and the slope can push the pin to move closer to the bottom of the mounting groove.

[0017] As a further improvement and optimization of the present invention, two side surfaces of the touch panel along the moving direction of the movable bracket are both arranged in an arc shape, 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 plays the role of 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, the overload protector is generally arranged in series in the circuit, and the resistance value of the overload protector is greater than the resistance value of the wire. Therefore, additional energy consumption will be generated. In contrast, in this solution, there is no such additional energy consumption;

[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 into the two touch 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 overload triggering medium 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 a 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, the present scheme is to achieve circuit breaking by pushing the touch plate against the push rod to move. 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. In contrast, in the prior art, the disconnection of the moving contact and the static contact is similar to 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 The structure diagram of the overload protection mechanism Figure 1 ;

[0025] Figure 4 The structure 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 a circuit component;

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

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

[0032] Fig.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 plate; 2024, mounting seat; 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, convex rod; 2034, protection unit; 204, controller; 205, ammeter; 2051, pointer; 2052, mounting ring; 2053, touch rod; 2054, knob; 2055, power connector; 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 explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation mode, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0036] Reference Figure 1-Figure 11 , 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.

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

[0038] Line component 202: reference Figure 8 and Fig.10 The line assembly 202 includes a line component, and two line components are arranged along 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 touch plate 2023 is provided on each of the facing sides of the mounting base 2024 in the two circuit components. The touch 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 arranged between the contact plates 2023 in the two circuit components. Furthermore, due to the existence 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, and 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 respectively arranged on the opposite sides of the mounting base 2024 in the two circuit components, 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] Among 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 disposed between the second circuit connector 2026 and the first circuit connector 2021 . A coil 2028 is disposed 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 source and the power-consuming device respectively. Of course, the connection route includes other existing electrical components, which can be realized by 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, these conductive components are connected in series, equivalent to a wire;

[0047] In addition, when alternating current flows 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 Fig. 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 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. 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 are in 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 are in 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: Reference Fig.10 and Fig.11The protection component 203 includes a movable bracket 2031 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 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 cylinder shell 206 , one end of the outer cylinder shell 206 is open and provided with an end cover, and the other end is closed and provided with a through hole, and the end covers on the two outer cylinder shells 206 are coaxially connected.

[0053] A piston 207 is sleeved in the outer cylinder shell 206, 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 arranged between the piston 207 and the closed end of the outer cylinder shell 206, and a thermal expansion medium is arranged in the area between the piston 207 and the end cover.

[0054] A limit assembly is provided at the closed end of the outer cylinder shell 206, and the limit assembly includes a slot 2081 provided on the outer cylindrical surface of the ejector rod 208 and a mounting slot provided on the outer cylindrical surface of the closed end of the outer cylinder shell 206. A bayonet 210 is sleeved in the mounting slot, and a bypass opening for avoiding the ejector rod 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 is in contact with the ejector rod 208. In the process that the thermal expansion medium undergoes thermal expansion and pushes the piston 207 and the ejector rod 208 to move, when the slot 2081 is directly opposite to the hole wall of the bypass opening, the third spring 211 releases its elastic force, so that the hole wall of the bypass hole can be inserted into the slot 2081, thereby limiting the movement of the ejector rod 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, see Fig.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 groove 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 groove, thereby canceling 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, see Figure 8 The two ends of the touch pad 2023 along the movement direction of the movable bracket 2031 are set into an arc shape, and the arc surfaces on the two touch pads 2023 are bent toward opposite sides. The significance is that it is convenient for the protection unit 2034 and the third circuit 2029 to enter and exit the area between the two touch pads 2023.

[0058] Working principle of the present invention:

[0059] During normal use, the third line 2029 is located between the two contact plates 2023, and the line component 202 is equivalent to a wire. The normal use of the power distribution cabinet is not affected, and the current passing through the line component 202 is monitored in real time by the ammeter 205. When the current is about to reach the critical value of overload triggering, the pointer 2051 contacts the contact rod 2053, the signal generator is powered on and sends a signal to the controller 204, and the controller 204 sends an instruction to the protection component 203 to start the linear module 2032 and drive the movable bracket 2031 to move. The movable bracket 2031 moves with the protection unit 2034 and the third line 2029. In this process:

[0060] Initially, the third line 2029 does not leave the area between the two contact plates 2023 and remains conductively connected, so there is no circuit breakage. Afterwards, the protection component 203 enters the area between the two contact plates 2023. In the protection component 203, the closed ends of the two outer cylinder shells 206 made of conductive material respectively form conductive contact with the two contact plates 2023. The outer cylinder shell 206 and the third line 2029 are in parallel relationship, so there is no circuit breakage. Afterwards, the third line 2029 leaves the area between the two contact plates 2023. In the area between the two contact plates 2023, only the outer cylinder shell 206 is left as the conductive medium between the two contact plates 2023. Since the resistance value of the outer cylinder shell 206 is relatively large, the power supply can generate heat, and the heat expansion medium will expand, which will push 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 will contact the contact plate 2023, and the two push rods 208 will push the two contact plates 2023 respectively, so that the outer cylinder shell 206 and the contact plate 2023 are out of contact, and a circuit is broken, thereby 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 instructions 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 convex rod 2033, so that the protection unit 2034 is reset.

[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 plays the role of 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, the overload protector is generally arranged in series in the circuit, and the resistance value of the overload protector is greater than the resistance value of the wire. Therefore, additional energy consumption will be generated. In contrast, in this solution, there is no such additional energy consumption;

[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 into the two touch 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 overload triggering medium 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 a 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, the present scheme is to achieve circuit breaking by pushing the touch plate against the push rod to move. 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. In contrast, in the prior art, the disconnection of the moving contact and the static contact is similar to 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 only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. 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 line component (202), a protection component (203), a controller (204) and an ammeter (205); the line component (202) comprises a line component, and two line 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, the first springs (2025) in the two circuit components are arranged on opposite sides of the mounting seats (2024) in the two circuit components, a touch plate (2023) is arranged on each side of the mounting seats (2024) facing each other in the two circuit components, 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 first springs (2025) are arranged on opposite sides of the mounting seats (2024) in the two circuit components. A first circuit connector (2021) is provided on each of the 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 an ammeter (205).

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 two contact plates (2023) respectively.

3. The overload emergency protection device for a power distribution cabinet according to claim 1, characterized in that: 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) is deflected, 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 a command to the protection component (203).

4. The overload emergency protection device for a power distribution cabinet according to claim 3, 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).

5. The overload emergency protection device for a power distribution cabinet according to claim 4, 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).

6. An overload emergency protection device for a power distribution cabinet according to claim 3 or 4, characterized in that: The protection component (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 arranged on the movable bracket (2031).

7. An overload emergency protection device for a power distribution cabinet according to claim 6, characterized in that: The protection unit (2034) comprises an outer cylindrical shell (206) arranged vertically, 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, a piston (207) is sleeved inside the outer cylindrical shell (206), a push rod (208) extends from the end surface of the piston (207), and the end of the push rod (208) is located in the through hole, a second spring (209) is arranged between the piston (207) and the closed end of the outer cylindrical shell (206), and a thermal expansion medium is arranged in the area between the piston (207) and the end cover, the outer cylindrical shell (206) of the protection component (203) is made of 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).

8. An overload emergency protection device for a power distribution cabinet according to claim 7, characterized in that: A limit assembly is provided at the closed end of the outer cylinder shell (206), the limit assembly comprising a clamping groove (2081) provided on the outer circumferential surface of the push rod (208) and a mounting groove provided on the outer circumferential surface of the closed end of the outer cylinder shell (206), a clamping pin (210) is sleeved in the mounting groove, a clearance opening for avoiding the push rod (208) is provided on the clamping pin (210), a third spring (211) is provided between the clamping pin (210) and the groove bottom of the mounting groove, initially, the third spring (211) is in a compressed state, and in the process of the heat expansion medium thermally expanding and pushing the piston (207) and the push rod (208), the clamping groove (2081) can face the hole wall of the clearance opening, and the elastic force of the third spring (211) is released to enable the hole wall of the clearance opening to be inserted into the clamping groove (2081).

9. An overload emergency protection device for a power distribution cabinet according to claim 8, 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.

10. An overload emergency protection device for a power distribution cabinet according to claim 7, 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 towards opposite sides.

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