CN112260385A

CN112260385A - Circuit overload monitoring device with selective circuit breaking function

Info

Publication number: CN112260385A
Application number: CN202011102613.8A
Authority: CN
Inventors: 朱金德
Original assignee: Hangzhou Caiya Electronic Technology Co Ltd
Current assignee: Hangzhou Caiya Electronic Technology Co Ltd
Priority date: 2020-10-15
Filing date: 2020-10-15
Publication date: 2021-01-22

Abstract

The invention discloses a circuit overload monitoring device for selective circuit breaking, which comprises a box body, wherein a working cavity is arranged in the box body, the inner walls of the front side and the rear side of the working cavity are vertically symmetrical and are fixedly provided with two fixing plates, the working circuit is divided into a white list circuit and a non-white list circuit, when the total circuit is overloaded, the non-white list circuit is preferentially broken to relieve the overload state of the total circuit, the load of the white list circuit can be ensured to maintain a normal working state, so that the accidental loss caused by the sudden circuit breaking of the total circuit is prevented, in the process, the device sends out an alarm to remind a worker to manually close some non-white list loads, so that the maximum load use is realized in a load bearing range of the total circuit, the device carries out real-time monitoring on the load condition of the total circuit, and can effectively realize the preferential distribution of circuit energy, the rationality of the power utilization is improved.

Description

Circuit overload monitoring device with selective circuit breaking function

Technical Field

The invention relates to the field of power grid monitoring, in particular to a circuit overload monitoring device with selective circuit breaking.

Background

When current flows through the wire, the wire heats up and increases in temperature. In an electrical line, the amount of current that is allowed to pass through continuously without overheating the wire is called the safe ampacity, and if the current flowing through the wire exceeds the safe ampacity, the wire is overloaded.

The overload of the circuit can cause the damage of electrical components, if the circuit breaker is installed, the circuit breaker can trip, however, the overload circuit-breaking protection of the existing circuit often happens in the moment, and the whole circuit is often broken, the sudden power-off often causes certain damage to some equipment, and if some important data are not stored in time in editing, the data loss is possibly caused, and more serious loss is caused. The present invention addresses the above-mentioned problems.

Disclosure of Invention

The technical problem is as follows: the overload circuit-breaking protection of the existing circuit usually happens instantaneously, a sudden power-off often causes certain damage to some equipment, and if some important data are not stored in time in editing, the data are possibly lost, and more serious loss is caused.

In order to solve the above problems, the present embodiment provides a circuit overload monitoring device for selective circuit breaking, which comprises a box body, a working chamber is arranged in the box body, two fixing plates are symmetrically arranged on the front and back inner walls of the working chamber, a first electric wire is fixedly arranged in the upper fixing plate, the other end of the first electric wire is divided into two parts in the working chamber and extends to the outer side of the upper end face of the box body respectively, the first electric wire is electrically connected with white list electric appliances at the left end, the first electric wire is electrically connected with a main circuit at the right end, a second electric wire is fixedly arranged in the lower fixing plate, the other end of the second electric wire extends to the outer side of the lower end face of the box body and is electrically connected with the white list electric appliances, a circuit breaking device is arranged in the working chamber, the circuit breaking device comprises two first bearing plates which are symmetrically arranged on the front and back inner walls of the working chamber, two guide rods are symmetrically and fixedly arranged in front and back between the two first bearing plates, a connecting block is arranged on each guide rod in a left-right sliding mode, a connecting wire capable of being electrically connected with the first electric wire and the second electric wire is fixedly arranged in each connecting block, an induction device is arranged on the upper side of the circuit breaking device and comprises a heat conducting block fixedly arranged at the other end of the right side on the first electric wire, an induction box is fixedly arranged on the right end face of the heat conducting block, an induction cavity is arranged in each induction box, a first piston plate is arranged in each induction cavity in a left-right sliding mode, the left side of the first piston plate in each induction cavity is filled with thermal expansion gas, a first spring is fixedly arranged between the right end face of the first piston plate and the inner wall of the right side of the induction cavity, a power cavity is arranged in each box, an alarm delay device is arranged in each power cavity and comprises a motor fixedly arranged on the inner wall of the, the power shaft is connected with the right end of the motor in a power connection mode and is rotatably connected with the inner wall of the right side of the power cavity, a cam is fixedly arranged on the power shaft, a pull rope is fixedly arranged on the inner wall of the upper side of the power cavity, a small bell capable of being abutted against the cam is hung at the lower end of the pull rope, a pressure relief cavity is formed in the box body, the inner wall of the upper side of the box body is communicated with the inner wall of the lower side of the working cavity, and a pressure relief device is.

Wherein the circuit breaking device also comprises a first fixed rod which is fixedly arranged on the left end surface of the connecting block and is connected with the first bearing shaft plate on the left side in a left-right sliding way, a touch cavity is arranged in the box body, a touch plate is arranged in the touch cavity in a left-right sliding manner, a second spring is fixedly arranged between the right end surface of the touch plate and the inner wall of the right side of the touch cavity, a first chute is arranged on the inner wall of the upper side of the touch cavity and the inner wall of the lower side of the working cavity in a run-through manner, a fixed pin which slides left and right in the first chute is fixedly arranged between the lower end surface of the first fixed rod and the upper end surface of the touch plate, and by controlling the relative position of the touch plate in the touch cavity, the connection and disconnection of the connecting lead and the first and second wires can be realized, and when the second wire is overloaded, the circuit is broken so as to protect the working state of the first wire.

Wherein, the induction device also comprises a first piston rod which is fixedly arranged on the right end surface of the first piston plate, the right end of the first piston rod extends into the working cavity, a driving inclined surface block is fixedly arranged on the lower end surface of the first piston rod, a second bearing plate is fixedly arranged on the inner wall of the right side of the working cavity, a slide rod is arranged in the second bearing plate in a vertical sliding manner, a driven inclined surface block which can be abutted against the driving inclined surface block is fixedly arranged on the left end surface of the slide rod, a third spring is fixedly arranged between the lower end surface of the driven inclined surface block and the upper end surface of the second bearing plate, a second fixed rod which can be connected with the first bearing plate in a horizontal sliding manner is fixedly arranged on the right end surface of the linking block, a first clamping block is fixedly arranged on the upper end surface of the second fixed rod, rotating pins are rotatably arranged on the torsional springs on the front and rear inner walls of the working cavity, and, the upper end face of the lower end of the clamping rod is fixedly provided with a second clamping block, the right end face of the second clamping block is fixedly provided with a trigger switch capable of abutting against the left end face of the first clamping block, the lower end face of the slide rod can abut against the upper end face of the right end of the clamping rod, when the first electric wire is overloaded, the heat conducting block generates heat, gas expansion in the induction cavity pushes the first piston plate to move rightwards, the driving inclined plane block moves rightwards to push the driven inclined plane block to move downwards, so that the slide rod moves downwards to abut against the clamping rod and drives the clamping rod to rotate clockwise, the clamping of the first clamping block and the second clamping block is released, and the first clamping block loses the abutting against the trigger switch and the overload protection of the trigger device.

Wherein, the alarm time-delay device also comprises a pressure cavity which is arranged in the box body and is positioned at the lower side of the power cavity, a second piston plate is arranged in the pressure cavity in a vertical sliding manner, a second piston rod which is connected with the upper side inner wall of the pressure cavity and the lower side inner wall of the power cavity in a vertical sliding manner is fixedly arranged on the upper end surface of the second piston plate, a driven plate of which the upper end surface is butted with the cam is fixedly arranged on the upper end surface of the second piston rod, a fourth spring is fixedly arranged between the lower end surface of the driven plate and the lower side inner wall of the power cavity, a transition cavity is arranged in the box body, the right side inner wall of the transition cavity is communicated with the left side inner wall of the butted cavity and is provided with a balloon positioned in the butted cavity in a threaded connection manner, an air inlet hole is arranged, the inner wall of the lower side of the pressure cavity and the inner wall of the left side of the transition cavity are communicated with air outlet holes, air outlet one-way valves for one-way air outlet are arranged in the air outlet holes, when the trigger switch and the first clamping block lose conflict, the motor works, the cam rotates to hit the bell to give an alarm and conflict to drive the driven plate to move up and down, the second piston plate moves up and down in the pressure cavity and sucks air through the air inlet hole and the air inlet one-way valve, the air is extruded into the transition cavity through the air outlet one-way valve, and the air pressure of the transition cavity is increased to enable the balloon to expand in the conflict cavity, so that the conflict plate is pushed to complete intermittent trial access to the second electric wire.

Wherein, the pressure relief device comprises an electromagnet fixedly arranged on the inner wall of the upper side of the pressure relief cavity and connected with the second electric wire in series, a sliding cavity positioned at the lower side of the transition cavity is arranged in the box body, a sliding plate is arranged in the sliding cavity in a left-right sliding manner, a fifth spring is fixedly arranged between the right end surface of the sliding plate and the inner wall of the right side of the sliding cavity, a pressure relief hole is arranged on the inner wall of the lower side of the transition cavity and the inner wall of the upper side of the pressure relief cavity in a penetrating manner, a second sliding groove is arranged on the inner wall of the lower side of the sliding cavity and the inner wall of the upper side of the pressure relief cavity in a penetrating manner, a third fixing rod which is arranged in the second sliding groove in a penetrating manner is fixedly arranged on the lower end surface of the sliding plate, a permanent magnet which can be attracted with the electromagnet is fixedly arranged on the right end surface of the third fixing rod, when the, thereby the electro-magnet with the permanent magnet actuation, the slide is located the relative right side position in the sliding chamber, the compression of fifth spring, the slide does not block up the pressure release hole, consequently the atmospheric pressure will pass through in the transition chamber the release of pressure release hole, thereby realizes the gassing of balloon.

The invention has the beneficial effects that: according to the invention, the white list circuit and the non-white list circuit are divided into the working circuit, when the main circuit is overloaded, the non-white list circuit is preferentially broken to remove the overload state of the main circuit, and meanwhile, the load of the white list circuit can be ensured to maintain a normal working state, so that the accidental loss caused by the sudden disconnection of the main circuit is prevented.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.

The invention is further illustrated with reference to the following figures and examples.

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of the structure in the direction "A-A" of FIG. 1;

FIG. 3 is an enlarged schematic view of portion "B" of FIG. 1;

fig. 4 is an enlarged schematic view of a portion "C" in fig. 1.

Detailed Description

The invention will now be described in detail with reference to fig. 1-4, wherein for ease of description the orientations described hereinafter are now defined as follows: the up, down, left, right, and front-back directions described below correspond to the up, down, left, right, and front-back directions in the projection relationship of fig. 1 itself.

The invention relates to a selective circuit-breaking circuit overload monitoring device, which is mainly applied to the selective circuit-breaking circuit overload monitoring process, and the invention is further explained by combining the attached drawings of the invention: the invention relates to a selective circuit breaking circuit overload monitoring device, which comprises a box body 11, wherein a working cavity 67 is arranged in the box body 11, the inner walls of the front side and the rear side of the working cavity 67 are vertically symmetrical and are fixedly provided with two fixing plates 46, the fixing plate 46 on the upper side is fixedly provided with a first electric wire 31, the other end of the first electric wire 31 is divided into two parts in the working cavity 67 and respectively extends to the outer side of the upper end face of the box body 11, the first electric wire 31 at the other end of the left side is electrically connected with white list electric appliances, the first electric wire 31 at the other end of the right side is electrically connected with a main circuit, the fixing plate 46 on the lower side is fixedly provided with a second electric wire 47, the other end of the second electric wire 47 extends to the outer side of the lower end face of the box body 11 and is electrically connected with the white list electric appliances, a circuit breaking device 901 is arranged in the working cavity 67, the circuit breaking device 901 comprises, two guide rods 55 are symmetrically and fixedly arranged in front and back between the two first bearing plates 30, an engagement block 45 is arranged on each guide rod 55 in a left-right sliding manner, an engagement lead 44 capable of being electrically connected with the first electric wire 31 and the second electric wire 47 is fixedly arranged in each engagement block 45, an induction device 902 is arranged on the upper side of the circuit breaking device 901, each induction device 902 comprises a heat conduction block 62 fixedly arranged on the other end of the right side of the first electric wire 31, an induction box 63 is fixedly arranged on the right end face of the heat conduction block 62, an induction cavity 64 is arranged in each induction box 63, a first piston plate 66 is arranged in each induction cavity 64 in a left-right sliding manner, the left side of the first piston plate 66 in each induction cavity 64 is filled with thermal expansion gas, a first spring 65 is fixedly arranged between the right end face of the first piston plate 66 and the inner wall of the right side of each induction cavity 64, and a power cavity 23 is arranged in the box, the alarm device is characterized in that an alarm delay device 903 is arranged in the power cavity 23, the alarm delay device 903 comprises a motor 20 fixedly arranged on the inner wall of the left side of the power cavity 23, a power shaft 21 rotatably connected with the inner wall of the right side of the power cavity 23 is connected to the power connection of the right end of the motor 20, a cam 22 is fixedly arranged on the power shaft 21, a pull rope 25 is fixedly arranged on the inner wall of the upper side of the power cavity 23, a small bell 24 capable of abutting against the cam 22 is hung at the lower end of the pull rope 25, a pressure relief cavity 53 through which the inner wall of the upper side of the box body 11 is communicated with the inner wall of the lower side of the working cavity 67 is arranged in the.

According to an embodiment, the circuit breaking device 901 is described in detail below, the circuit breaking device 901 further includes a first fixing rod 27 fixedly disposed on a left end surface of the connecting block 45 and slidably connected to the first bearing plate 30 on the left side, a contact chamber 50 is disposed in the box 11, a contact plate 49 is slidably disposed in the contact chamber 50 on the left side and on the right side, a second spring 48 is fixedly disposed between a right end surface of the contact plate 49 and a right inner wall of the contact chamber 50, a first sliding slot 28 is disposed between an upper inner wall of the contact chamber 50 and a lower inner wall of the working chamber 67, a fixing pin 29 slidably disposed in the first sliding slot 28 is fixedly disposed between a lower end surface of the first fixing rod 27 and an upper end surface of the contact plate 49, and by controlling a relative position of the contact plate 49 in the contact chamber 50, connection and disconnection between the lead 44 and the first wire 31 and the second wire 47 can be realized, when the second electric wire 47 is overloaded, a disconnection is performed to protect the operating state of the first electric wire 31.

According to the embodiment, the sensing device 902 is described in detail below, the sensing device 902 further includes a first piston rod 32 fixedly disposed on the right end surface of the first piston plate 66, and the right end of the first piston rod 32 extends into the working chamber 67, a driving inclined surface block 33 is fixedly disposed on the lower end surface of the first piston rod 32, a second bearing plate 36 is fixedly disposed on the inner wall of the right side of the working chamber 67, a sliding rod 37 is slidably disposed in the second bearing plate 36 up and down, a driven inclined surface block 34 capable of abutting against the driving inclined surface block 33 is fixedly disposed on the left end surface of the sliding rod 37, a third spring 35 is fixedly disposed between the lower end surface of the driven inclined surface block 34 and the upper end surface of the second bearing plate 36, a second fixing rod 43 capable of being slidably connected with the first bearing plate 30 on the right side is fixedly disposed on the right end surface of the engaging block 45, a first clamping block 42 is fixedly disposed on the upper end surface of the second fixing rod 43, the torsional spring on the front and rear inner walls of the working cavity 67 is rotatably provided with a rotating pin 39, the rotating pin 39 is fixedly provided with a clamping rod 40, the lower end face of the left end of the clamping rod 40 is fixedly provided with a second clamping block 38, the right end face of the second clamping block 38 is fixedly provided with a trigger switch 41 capable of abutting against the left end face of the first clamping block 42, the lower end face of the sliding rod 37 can abut against the upper end face of the right end of the clamping rod 40, when the first wire 31 is overloaded, the heat-conducting block 62 generates heat, the gas in the sensing cavity 64 expands to push the first piston plate 66 to move right, the driving inclined-surface block 33 moves right to push the driven inclined-surface block 34 to move down, so that the sliding rod 37 moves down to abut against the clamping rod 40 and drive the clamping rod 40 to rotate clockwise, the clamping of the first clamping block 42 and the second clamping block 38 is released, and the first clamping block 42 loses the abutment against the trigger switch 41, triggering overload protection of the device.

According to the embodiment, the detail of the alarm delay device 903 is described below, the alarm delay device 903 further includes a pressure chamber 16 disposed in the box 11 and located on the lower side of the power chamber 23, a second piston plate 15 is slidably disposed in the pressure chamber 16 up and down, a second piston rod 17 slidably connected to the upper inner wall of the pressure chamber 16 and the lower inner wall of the power chamber 23 up and down is fixed to the upper end surface of the second piston plate 15, a driven plate 19 having an upper end surface abutting against the cam 22 is fixed to the upper end surface of the second piston rod 17, a fourth spring 18 is fixed between the lower end surface of the driven plate 19 and the lower inner wall of the power chamber 23, a transition chamber 26 is disposed in the box 11, a balloon 51 located in the abutting chamber 50 is disposed in threaded connection with the inner wall on the left side of the abutting chamber 50 and penetrates through the inner wall on the lower side of the pressure chamber 16 and the lower end surface of the box 11, and an air inlet 54 is disposed, an air inlet one-way valve 12 for one-way air inlet is arranged in the air inlet 54, an air outlet 13 is arranged on the inner wall of the lower side of the pressure cavity 16 and the inner wall of the left side of the transition cavity 26 in a penetrating manner, an air outlet one-way valve 14 for one-way air outlet is arranged in the air outlet 13, when the trigger switch 41 loses the interference with the first latch 42, the motor 20 operates, the cam 22 rotates to strike the bell 24 to send an alarm and drives the driven plate 19 to move up and down, the second piston plate 15 moves up and down in the pressure chamber 16 and sucks air through the intake holes 54 and the intake check valve 12, air is extruded into the transition cavity 26 through the air outlet one-way valve 14 and the air outlet hole 13, the balloon 51 is inflated within the abutment cavity 50 by increasing the gas pressure in the transition cavity 26, thereby pushing the contact plate 49 to complete the intermittent attempted path of the second wire 47.

According to the embodiment, the following detailed description will be made on the pressure relief device 904, where the pressure relief device 904 includes an electromagnet 52 fixedly disposed on the upper inner wall of the pressure relief cavity 53 and connected in series with the second wire 47, a sliding cavity 58 located on the lower side of the transition cavity 26 is disposed in the box 11, a sliding plate 57 is disposed in the sliding cavity 58 in a left-right sliding manner, a fifth spring 59 is fixedly disposed between the right end surface of the sliding plate 57 and the right inner wall of the sliding cavity 58, a pressure relief hole 56 is disposed in the lower inner wall of the transition cavity 26 and the upper inner wall of the pressure relief cavity 53 in a penetrating manner, the pressure relief hole 56 is disposed in the upper and lower inner walls of the sliding cavity 58 in a penetrating manner, a second sliding groove 68 is disposed in the lower inner wall of the sliding cavity 58 and the upper inner wall of the pressure relief cavity 53 in a penetrating manner, a third fixing rod 61 which slides in the second sliding manner in the second sliding groove 68 is fixedly disposed on the lower end surface of the, when the second wire 47 is in an electrified state, the electromagnet 52 connected in series with the second wire is electrified and has magnetism, so that the electromagnet 52 is attracted to the permanent magnet 60, the sliding plate 57 is located at a position on the right side relative to the sliding cavity 58, the fifth spring 59 is compressed, the sliding plate 57 does not block the pressure relief hole 56, and therefore air pressure in the transition cavity 26 is released through the pressure relief hole 56, and therefore air relief of the balloon 51 is achieved.

The steps of using a selective-open circuit overload monitoring device herein will be described in detail with reference to fig. 1 to 4: initially, the hot expanding gas in the sensing cavity 64 is not expanded, the first spring 65 is not compressed, the driving inclined plane block 33 just abuts against the driven inclined plane block 34, the third spring 35 is only under the action of gravity, the lower end face of the sliding rod 37 just abuts against the upper end face of the right end of the clamping rod 40, the clamping rod 40 is kept horizontal, the elastic potential energy of the torsion spring of the rotating pin 39 is not accumulated, the trigger switch 41 abuts against the left end face of the first clamping block 42 and limits the left movement of the first clamping block 42, the connecting lead 44, the second electric wire 47 and the first electric wire 31 are in a connected state, the abutting plate 49 is positioned at a position on the right side in the abutting cavity 50, the second spring 48 is compressed, the second electric wire 47 is electrified, the electromagnet 52 has magnetism and is attracted with the permanent magnet 60, the sliding plate 57 is positioned at a position on the right side in the sliding cavity 58, the fifth spring 59 is compressed, the sliding plate 57 does not block the pressure; when the main circuit is overloaded, the non-white list electric appliance is broken to reduce the load and protect the working state of the white list electric appliance, when the first wire 31 is overloaded, the heat conducting block 62 generates heat, the gas in the sensing cavity 64 expands to push the first piston plate 66, the first piston rod 32 and the driving inclined plane block 33 to move right, the first spring 65 compresses, the driving inclined plane block 33 moves right to push the driven inclined plane block 34 and the sliding rod 37 to move down, the third spring 35 compresses, the sliding rod 37 moves down to abut against the clamping rod 40 and drives the clamping rod 40 to rotate clockwise, the clamping of the first clamping block 42 and the second clamping block 38 is released, the first clamping block 42 loses the abutment against the trigger switch 41, the trigger motor 20 works, the left movement limitation of the first clamping block 42 is released, and under the elastic force of the second spring 48, the abutting plate 49, the fixing pin 29, the first fixing rod 27, the engaging block 45, the engaging wire 44, the load and the working state of the white list electric appliance are protected, The second fixing rod 43 and the first clamping block 42 move leftwards, the connecting lead 44 is connected with the first electric wire 31 and the second electric wire 47, so that the second electric wire 47 is disconnected, the electromagnet 52 loses magnetism and the permanent magnet 60 loses attraction, the sliding plate 57 moves leftwards to block the pressure relief hole 56 under the action of the elasticity of the fifth spring 59, the motor 20 works to drive the power shaft 21 and the cam 22 to rotate, the cam 22 rotates to strike the bell 24, and therefore an alarm is given out to remind a worker of the circuit load condition; when the device is switched on again, the device reminds the operator to pay attention to the load condition of the circuit, so that the operator can manually switch off part of the non-white list electric appliances, in the process, the device intermittently switches on the second electric wire 47 in an attempt mode to observe whether the load of the total circuit can reach a bearing range, the cam 22 rotates to abut against the driven plate 19 and drive the driven plate 19, the second piston rod 17 and the second piston plate 15 to move up and down under the action of the elastic force of the fourth spring 18, the second piston plate 15 moves up and down in the pressure cavity 16 and sucks air through the air inlet hole 54 and the air inlet check valve 12, the air is extruded into the transition cavity 26 through the air outlet check valve 14 and the air outlet hole 13, the balloon 51 expands in the abutting cavity 50 by increasing the air pressure of the transition cavity 26 to push the abutting contact plate 49 to move right, the second spring 48 is compressed, at the moment, due to the disconnection of the second electric wire 47, the first electric wire, the clamping rod 40 and the second clamping block 38 return to the initial positions along the same transmission route, the first clamping block 42 moves rightwards to abut against the second clamping block 38, the second clamping block 38 rotates clockwise and then returns to the original position, the first clamping block 42 abuts against the trigger switch 41 again, the motor 20 stops working, the alarm is relieved, the connecting lead 44 is communicated with the first electric wire 31 and the second electric wire 47 again, the second electric wire 47 is electrified again, the permanent magnet 60 is attracted with the electromagnet 52, the sliding plate 57 moves rightwards to relieve the blockage of the pressure relief hole 56, the air pressure in the transition cavity 26 is released through the pressure relief hole 56, and therefore the deflation of the balloon 51 is realized, at the moment, all devices return to the initial state, if the load connected with the second electric wire 47 at the moment meets the load requirement of a total circuit, the second electric wire 47 can be stably in the connected state, if the load of the total circuit is still too large after a part of non-white list electric appliances are manually closed at, until the load to which the second wire 47 is connected meets the total circuit load requirement.

In the above manner, a person skilled in the art can make various changes depending on the operation mode within the scope of the present invention.

Claims

1. The utility model provides a circuit overload monitoring devices of selectivity broken circuit, includes the box, be equipped with the working chamber in the box, the symmetry just fixes being equipped with two fixed plates, its characterized in that about the inner wall of side about the working chamber goes up: a first electric wire is fixedly arranged in the fixing plate on the upper side, the other end of the first electric wire is divided into two parts in the working cavity and respectively extends to the outer side of the upper end face of the box body, the first electric wire at the other end on the left side is electrically connected with a white list electric appliance, the first electric wire at the other end on the right side is electrically connected with a main circuit, a second electric wire is fixedly arranged in the fixing plate on the lower side, the other end of the second electric wire extends to the outer side of the lower end face of the box body and is electrically connected with a non-white list electric appliance, and; the circuit breaking device comprises two first bearing plates which are bilaterally symmetrical and fixedly arranged on the inner walls of the front side and the rear side of the working cavity, two guide rods are symmetrically and fixedly arranged between the two first bearing plates in the front-rear direction, the guide rods are provided with connecting blocks in a left-right sliding manner, and connecting wires which can be electrically connected with the first electric wires and the second electric wires are fixedly arranged in the connecting blocks; an induction device is arranged on the upper side of the circuit breaking device, the induction device comprises a heat conduction block fixedly arranged at the other end of the right side of the circuit breaking device, an induction box is fixedly arranged on the right end face of the heat conduction block, an induction cavity is arranged in the induction box, a first piston plate is arranged in the induction cavity in a left-right sliding mode, the left side of the first piston plate in the induction cavity is filled with thermal expansion gas, a first spring is fixedly arranged between the right end face of the first piston plate and the inner wall of the right side of the induction cavity, and a power cavity is arranged in the box body; the alarm delay device is arranged in the power cavity and comprises a motor fixedly arranged on the inner wall on the left side of the power cavity, a power shaft connected with the inner wall on the right side of the power cavity in a rotating mode is arranged at the power connection of the right end of the motor, a cam is fixedly arranged on the power shaft, a pull rope is fixedly arranged on the inner wall on the upper side of the power cavity, a small bell capable of being abutted against the cam is hung at the lower end of the pull rope, a pressure relief cavity communicated with the inner wall on the lower side of the working cavity is formed in the box body, and a pressure relief device is arranged in the pressure relief cavity.

2. A selectively opened circuit overload monitoring apparatus according to claim 1, wherein: the circuit breaking device is characterized by further comprising a first fixing rod fixedly arranged on the left end face of the connecting block and connected with the left side in a sliding mode, a butting cavity is formed in the box body, a butting plate is arranged in the butting cavity in a sliding mode, the right end face of the butting plate is fixedly provided with a second spring between the inner walls of the right side of the butting cavity, the inner wall of the upper side of the butting cavity is communicated with a first sliding groove formed in the inner wall of the lower side of the working cavity, and a fixing pin capable of sliding left and right in the first sliding groove is fixedly arranged between the upper end face of the first fixing rod and the upper end face of the butting plate.

3. A selectively opened circuit overload monitoring apparatus according to claim 1, wherein: the induction device also comprises a first piston rod which is fixedly arranged on the right end face of the first piston plate, the right end of the first piston rod extends into the working cavity, a driving inclined plane block is fixedly arranged on the lower end face of the first piston rod, a second bearing plate is fixedly arranged on the inner wall of the right side of the working cavity, a slide rod is arranged in the second bearing plate in a vertical sliding manner, a driven inclined plane block which can be abutted against the driving inclined plane block is fixedly arranged on the left end face of the slide rod, a third spring is fixedly arranged between the lower end face of the driven inclined plane block and the upper end face of the second bearing plate, a second fixed rod which can be connected with the first bearing plate in a horizontal sliding manner is fixedly arranged on the right end face of the linking block, a first clamping block is fixedly arranged on the upper end face of the second fixed rod, rotating pins are rotatably arranged on the torsional springs on the front and rear inner walls of the working cavity, clamping rods are fixedly arranged on the rotating pins, and second clamping blocks are, the right end face of the second clamping block is fixedly provided with a trigger switch which can be abutted against the left end face of the first clamping block, and the lower end face of the sliding rod can be abutted against the upper end face of the right end of the clamping rod.

4. A selectively opened circuit overload monitoring apparatus according to claim 1, wherein: the alarm time delay device also comprises a pressure cavity which is arranged in the box body and is positioned at the lower side of the power cavity, a second piston plate is arranged in the pressure cavity in a vertical sliding manner, a second piston rod which is connected with the upper side inner wall of the pressure cavity and the lower side inner wall of the power cavity in a vertical sliding manner is fixedly arranged on the upper end surface of the second piston plate, a driven plate of which the upper end surface is butted with the cam is fixedly arranged on the upper end surface of the second piston rod, a fourth spring is fixedly arranged between the lower end surface of the driven plate and the lower side inner wall of the power cavity, a transition cavity is arranged in the box body, the right side inner wall of the transition cavity is communicated with the left side inner wall of the conflict cavity and is in threaded connection with the left side inner wall of the conflict cavity, an air inlet hole is arranged on the lower side inner wall of the pressure cavity and the lower end surface of the, and an air outlet one-way valve for one-way air outlet is arranged in the air outlet hole.

5. A selectively opened circuit overload monitoring apparatus according to claim 1, wherein: pressure relief device is including fixed setting on the pressure release chamber upside inner wall and with the electro-magnet of second electric wire series connection, be equipped with in the box and be located the sliding chamber of transition chamber downside, the sliding chamber horizontal slip is equipped with the slide, the slide right-hand member face with fixed being equipped with the fifth spring between the sliding chamber right side inner wall, transition chamber downside inner wall with pressure release chamber upside inner wall link up and is equipped with the pressure release hole, the pressure release hole with sliding chamber upper and lower side inner wall link up, sliding chamber downside inner wall with pressure release chamber upside inner wall link up and is equipped with the second spout, fixed being equipped with on the terminal surface under the slide the second spout third dead lever of horizontal slip, fixed being equipped with on the third dead lever right-hand member face can with the permanent magnet actuation.