Contact wear monitoring method for magnetic induction circuit breaker

Abstract

The present invention discloses a contact wear monitoring method for a magnetic induction circuit breaker, including a circuit breaker, a base, a contact finger, two potentiometers and a connecting line, wherein the contact finger is mounted on the base and can move relative to the base, a cavity is provided on the surface of the base, a mounting shell is installed in the cavity, a traction component is installed in the inner cavity of the mounting shell, a reset component is provided at the lower end of the traction component, and two potentiometers are provided on both sides of the reset component; the present invention relates to the field of low-voltage electrical technology. The contact wear monitoring method for a magnetic induction circuit breaker can ensure the reset of the device through the reset component, and ensure that the sliding handle can always move in the vertical direction during the movement process, ensure the accuracy of the monitoring data, realize online monitoring of contact wear, and the monitoring result is more accurate and reliable. The present invention has a simple structure and low implementation cost.

Description

Technical Field

[0001] The invention relates to the field of low-voltage electrical technology, in particular to a contact wear monitoring method for a magnetic induction circuit breaker. Background Art

[0002] As a common device in the electrical field, circuit breakers will experience more or less wear on their contacts each time they are switched on and off, especially when there is an electric arc. When the contacts of the circuit breaker are worn to a certain extent, it will affect the stability and safety allowed by the equipment. Therefore, if the degree of contact wear can be monitored in real time, users will be able to understand the remaining life of the circuit breaker and whether it should be replaced.

[0003] According to the publication (announcement) number: CN103377860B, the publication (announcement) date: 2017-03-01, a circuit breaker is disclosed, which includes: a moving contact, which includes a base and a contact finger installed on the base and capable of moving relative to the base; a potentiometer, which is fixedly installed on the base; and a connecting wire, one end of which is fixed on the contact finger and the other end is fixed on the sliding handle of the potentiometer, so that the movement of the contact finger relative to the base can drive the sliding handle to slide on the potentiometer via the connecting wire to cause the output voltage of the potentiometer to change. The above circuit breaker of the present invention can monitor the wear of the contacts at a low cost. The present invention also provides a method for monitoring contact wear through the aforementioned circuit breaker. However, in the prior art, a connecting wire is used to drive a sliding handle to move on a potentiometer to achieve monitoring. However, in the process of the connecting wire driving the sliding handle to move, since one end of the connecting wire is directly connected to the sliding handle, as the connecting wire moves, it is impossible to ensure that the sliding handle moves horizontally or vertically on the potentiometer, resulting in an inability to accurately determine the moving distance of the sliding handle, which results in inaccurate monitoring data. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a contact wear monitoring method for a magnetic induction circuit breaker, which solves the problem that the existing contact wear monitoring method for a magnetic induction circuit breaker cannot ensure that the sliding handle moves horizontally or vertically on the potentiometer during use, thereby resulting in the inability to accurately determine the moving distance of the sliding handle, thereby resulting in the problem of inaccurate monitoring data.

[0005] To achieve the above objectives, the present invention is implemented by the following technical scheme: A contact wear monitoring method for a magnetic induction circuit breaker specifically comprises the following steps:

[0006] S1; providing a potentiometer, the potentiometer is fixedly mounted on the base of the moving contact of the circuit breaker;

[0007] S2; provide a connecting wire, and fix one end of the connecting wire on the contact finger of the moving contact of the circuit breaker, and the other end is passed through the fixed pulley, the moving pulley, and the second fixed pulley in sequence and fixed to the top of the second fixed frame, and the connecting wire is always in a maximum tension state, so that the movement of the contact finger relative to the base can drive the second fixed frame to slide via the connecting wire, and the second fixed frame drives the connecting block, the hook, the positioning ring, and the counterweight block to slide, so that the counterweight block drives the sliding handle to slide on the potentiometer, and the contact wear monitoring device is used for monitoring;

[0008] S3; connecting the input end of the potentiometer to the control unit of the circuit breaker to obtain a constant input voltage from the control unit, connecting the output end of the potentiometer to the control unit of the circuit breaker, and measuring the output voltage of the potentiometer when the moving contact of the circuit breaker is normally closed; calculating the degree of contact wear of the circuit breaker after several on-off cycles, wherein the degree of wear is expressed as |V0-Vi| / |V0-V1|, wherein V0 represents the output voltage measured for the first time when the contact of the circuit breaker is not worn, V1 represents the output voltage measured when the contact of the circuit breaker is worn to the point of being unusable, and Vi represents the output voltage measured after several on-off cycles of the circuit breaker;

[0009] The contact wear monitoring device in S2 includes a circuit breaker, a base, a contact finger, two potentiometers and a connecting wire, and is characterized in that: the contact finger is installed on the base and can move relative to the base, a cavity is opened on the surface of the base, a mounting shell is installed in the cavity, a traction component is installed in the inner cavity of the mounting shell, a reset component is arranged at the lower end of the traction component, and two potentiometers are arranged on both sides of the reset component, one end of the connecting wire is fixed to the contact finger through a first connector, and the other end is connected to the traction component through a second connector, and the connecting wire is always in a maximum tension state; the traction component includes a first fixed frame fixedly installed on the top of the inner cavity of the mounting shell, the upper half of the first fixed frame is rotatably connected to a fixed pulley through a rotating shaft, and the lower half is connected to the fixed pulley through a rotating shaft. The cam is provided with a second fixed pulley for rotation, and a second fixed frame is provided in the middle of the inner cavity of the installation shell, and sliding rods are fixedly connected to the two sides of the second fixed frame and are slidably connected to the inner wall of the installation shell through the sliding rods, and the inner cavity of the second fixed frame is rotatably connected to the movable pulley through a rotating bearing, and a stabilizing component is provided at the bottom of the second fixed frame; the stabilizing component includes a connecting block fixedly connected to the bottom of the second fixed frame, and four groups of sliding holes are provided on the surface of the connecting block, and sliding rods are slidably connected in the four groups of sliding holes, and the bottom end of the sliding rod is fixedly connected to a fixed block, and the fixed block is installed at the bottom of the inner cavity of the installation shell, and a hook is installed at the bottom of the connecting block, and a counterweight block is slidably connected to the sliding rod, and a positioning ring is fixedly connected to the top of the counterweight block, and the hook is hung on the positioning ring.

[0010] Preferably, one end of the potentiometer is slidably connected to a sliding handle, and the other end of the potentiometer is respectively provided with an input end, a common end, and an output end.

[0011] Preferably, the sliding handles on the two groups of potentiometers are fixedly connected to the two sides of the counterweight block, the input end is connected to the voltage output end of the control unit of the circuit breaker, the common end is connected to the ground end of the control unit of the circuit breaker, and the output end is connected to the voltage input end of the control unit of the circuit breaker.

[0012] Preferably, a symmetrical sliding groove is provided on the inner wall of the installation shell, and a sliding block is symmetrically slidably connected in the sliding groove, and one end of the sliding block is fixedly connected to one end of the sliding rod.

[0013] Preferably, the reset assembly includes a symmetrical fixing plate, a positioning block is symmetrically fixedly installed on the inner wall of the fixing plate, a sliding groove is opened on the inner end of the positioning block, and a fixing rod is fixedly connected in the sliding groove, a sliding block is slidably connected to the fixing rod, a spring is sleeved on the fixing rod, and the spring is located on the top of the sliding block, a connecting plate is fixedly connected to the upper part of one side surface of the sliding block, and a connecting rod is fixedly connected to the top of the connecting plate.

[0014] Preferably, the fixing plates are symmetrically fixedly mounted on both sides of the inner wall of the mounting shell, and both ends of the counterweight block are fixedly connected to one end of the connecting rod.

[0015] Preferably, the connecting assembly includes two groups of rotating rods rotatably arranged on one side surface of the sliding block, a mounting block is fixedly connected to one side surface of the fixing plate and located below the reset assembly, a positioning shaft is fixedly connected to one side surface of the mounting block, the positioning shaft is respectively rotatably connected to a linkage plate and a sliding block, the sliding block can be rotated into the mounting block, and one end of the sliding block is movably connected to one end of the linkage plate through a rotating shaft, and the other end of the linkage plate is movably connected to one end of the rotating rod through a rotating shaft.

[0016] Preferably, the connecting wire is sequentially passed through the fixed pulley, the movable pulley, and the second fixed pulley and is fixedly connected to the top of the second fixed frame through a second connector. The connecting wire is made of an electrically insulating tensile-resistant material and is made of nylon braided wire.

[0017] Preferably, the circuit breaker further comprises a control unit, the output end of the potentiometer is electrically connected to the control unit of the circuit breaker to monitor the output voltage of the potentiometer in real time, the circuit breaker further comprises another control unit, the input end of the potentiometer is electrically connected to the control unit of the circuit breaker to obtain a constant input voltage from the control unit, the control unit comprises a calculation unit for calculating the degree of contact wear of the circuit breaker after several on-off cycles, wherein the degree of wear is expressed as |V0-Vi| / |V0-V1|, wherein V0 represents the output voltage first measured when the contacts of the circuit breaker are not worn out, V1 represents the output voltage measured when the contacts of the circuit breaker are worn to the point of being unusable, and Vi represents the output voltage measured after several on-off cycles of the circuit breaker, wherein V0 and V1 are respectively a constant, and the magnitude of the input voltage is between 0-5 volts.

[0018] Preferably, V0 and V1 are obtained in advance by conducting experiments on circuit breakers of the same model and stored as known parameters in the control unit of the circuit breaker. It also includes setting a threshold value for the degree of contact wear. When the actual calculated value of the degree of contact wear is greater than the threshold value, the control unit outputs an alarm signal, and the alarm signal is a sound signal, an optical signal, or a combination of a sound signal and an optical signal. The method also includes outputting the calculated value of the degree of contact wear to the display panel of the control unit for real-time display, and the input voltage is set between 0-5 volts.

[0019] Beneficial Effects

[0020] The present invention provides a contact wear monitoring method for a magnetic induction circuit breaker. Compared with the prior art, it has the following beneficial effects:

[0021] (1) The contact wear monitoring method of the magnetic induction circuit breaker can drive the connecting rods on both sides to move during the movement of the counterweight block, and the connecting rods can drive the connecting plate and the sliding block to move and compress the spring. The spring is arranged to facilitate the elastic force of the spring to reset the counterweight block and the sliding handle. The reset component is arranged to ensure the reset of the device and ensure that the sliding handle can always move in the vertical direction during the movement, thereby ensuring the accuracy of the monitoring data, realizing online monitoring of contact wear, and the monitoring result is more accurate and reliable. The present invention has a simple structure and low implementation cost.

[0022] (2) The contact wear monitoring method of the magnetic induction circuit breaker is to connect the output end of the potentiometer to the voltage input end of the control unit of the circuit breaker, whereby the output end and the common end constitute the voltage output end of the potentiometer. It should be noted that the wiring method of the potentiometer is not limited to this, and it depends on the actual model of the potentiometer. For low-end circuit breakers, they often do not have a control unit. In this case, the input end, common end and output end of the potentiometer can be led out through leads. When the user needs to detect the contact wear of the circuit breaker, these terminals can be connected to appropriate additional devices for measurement without having to disassemble the circuit breaker to observe the contact wear. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic diagram of a moving contact of a circuit breaker of the present invention;

[0024] Figure 2 It is a schematic diagram of the external structure of the installation shell in the present invention;

[0025] Figure 3 It is a structural schematic diagram of the traction assembly in the present invention;

[0026] Figure 4 It is a schematic diagram of the structure of the stabilizing component in the present invention;

[0027] Figure 5 It is a structural schematic diagram of the reset component in the present invention;

[0028] Figure 6 It is a structural cross-sectional view of the reset assembly in the present invention;

[0029] Figure 7 for Figure 6 Enlarged view of point A in the middle;

[0030] Figure 8 It is a structural cross-sectional view of the installation housing in the present invention;

[0031] Fig. 9 It is a schematic diagram of the structure of the potentiometer in the present invention;

[0032] Fig.10 The present invention is a flow chart of a method for monitoring the degree of contact wear of a circuit breaker after several on-off cycles.

[0033] In the figure: 1, base; 2, contact finger; 3, potentiometer; 4, connecting line; 5, mounting shell; 6, traction assembly; 7, reset assembly; 8, connecting assembly; 101, cavity; 301, sliding handle; 302, input end; 303, common end; 304, output end; 401, first connector; 402, second connector; 501, slide groove; 502, slider; 601, first fixed frame; 602, fixed pulley; 603, second fixed pulley; 604, sliding rod; 605, second fixed frame; 606, movable pulley; 607, stabilizing assembly; 701, positioning block; 702, sliding block; 703, fixed rod; 704, spring; 705, connecting plate; 706, connecting rod; 707, fixed plate; 801, rotating rod; 802, mounting block; 803, positioning shaft; 804, linkage plate; 805, sliding block. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] See also Figure 1-10 The present invention provides a technical solution: a contact wear monitoring method for a magnetic induction circuit breaker, which specifically comprises the following steps:

[0036] S1; providing a potentiometer 3, the potentiometer 3 is fixedly mounted on the base 1 of the moving contact of the circuit breaker;

[0037] S2; provide a connecting wire 4, and fix one end of the connecting wire 4 on the contact finger of the moving contact of the circuit breaker, and the other end is passed through the fixed pulley 602, the movable pulley 606, and the second fixed pulley 603 in sequence and fixed to the top of the second fixed frame 605, and the connecting wire 4 is always in a maximum tension state, so that the movement of the contact finger 2 relative to the base 1 can drive the second fixed frame 605 to slide via the connecting wire 4, and the second fixed frame 605 drives the connecting block 6071, the hook 6077, the positioning ring 6076, and the counterweight block 6075 to slide, so that the counterweight block 6075 drives the sliding handle 301 to slide on the potentiometer 3, and is monitored by the contact wear monitoring device;

[0038] S3; connecting the input end of the potentiometer 3 to the control unit of the circuit breaker to obtain a constant input voltage from the control unit, connecting the output end of the potentiometer 3 to the control unit of the circuit breaker, and measuring the output voltage of the potentiometer when the moving contact of the circuit breaker is normally closed; calculating the degree of contact wear of the circuit breaker after several on-off cycles, wherein the degree of wear is expressed as |V0-Vi| / |V0-V1|, wherein V0 represents the output voltage measured for the first time when the contact of the circuit breaker is not worn, V1 represents the output voltage measured when the contact of the circuit breaker is worn to the point of being unusable, and Vi represents the output voltage measured after several on-off cycles of the circuit breaker;

[0039] The contact wear monitoring device in S2 is used for monitoring, and includes a circuit breaker, a base 1, a contact finger 2, two potentiometers 3 and a connecting wire 4. The contact finger 2 is mounted on the base 1 and can move relative to the base 1. A cavity 101 is provided on the surface of the base 1. A mounting shell 5 is mounted in the cavity 101. A traction component 6 is mounted in the inner cavity of the mounting shell 5. A reset component 7 is arranged at the lower end of the traction component 6, and two potentiometers 3 are arranged on both sides of the reset component 7. One end of the connecting wire 4 is fixed on the contact finger 2 through a first connector 401, and the other end is connected to the traction component 6 through a second connector 402, and the connecting wire 4 is always in a maximum tension state. During the closing process of the moving contact of the circuit breaker, first, the base 1 and the contact finger 2 of the moving contact are moved toward the static contact of the circuit breaker (the static contact is in Figure 1 4, and the movable contact is moved toward the fixed contact. Figure 1Therefore, it can be foreseen that, since the base 1 of the moving contact always moves to the same predetermined position during each closing process, as the moving and static contacts wear, when the moving and static contacts are more worn, the position of the leftmost side of the contact finger of the moving contact (the side in contact with the static contact) will be farther away from the base 1 of the moving contact than when the moving and static contacts are less worn, thereby causing the sliding handle of the potentiometer to move further to the upper side. In other words, the wear of the moving and static contacts can be The change of the position of the sliding handle of the potentiometer is characterized by the change of the output voltage of the potentiometer. Therefore, by monitoring the output voltage of the potentiometer, the total wear of the moving and static contacts of the circuit breaker can be monitored. The traction component 6 includes a first fixed frame 601 fixedly installed on the top of the inner cavity of the installation shell 5, the upper half of the first fixed frame 601 is rotatably connected to a fixed pulley 602 through a rotating shaft, and the lower half is rotatably connected to a second fixed pulley 603 through a rotating shaft. A second fixed frame 605 is arranged in the middle of the inner cavity of the installation shell 5, and sliding rods 604 are fixedly connected to both sides of the second fixed frame 605, and The sliding rod 604 is slidably connected to the inner wall of the installation shell 5, and the inner cavity of the second fixed frame 605 is rotatably connected to the movable pulley 606 through a rotating bearing. The bottom of the second fixed frame 605 is provided with a stabilizing component 607; the stabilizing component 607 includes a connecting block 6071 fixedly connected to the bottom of the second fixed frame 605, and the surface of the connecting block 6071 is provided with four groups of sliding holes 6072 penetrating therethrough, and the four groups of sliding holes 6072 are slidably connected with sliding rods 6073, and the bottom end of the sliding rod 6073 is fixedly connected to a fixing block 6074, and the fixing block 6074 is installed at the bottom of the inner cavity of the installation shell 5, and the connecting block 60 A hook 6077 is installed at the bottom of 71, a counterweight 6075 is slidably connected to the slide bar 6073, a positioning ring 6076 is fixedly connected to the top of the counterweight 6075, the hook 6077 is hung on the positioning ring 6076, the connecting line 4 can drive the second fixed frame 605 to slide, the second fixed frame 605 can drive the connecting block 6071 to slide on the slide bar 6073, the connecting block 6071 drives the positioning ring 6076 and the counterweight 6075 to slide on the slide bar 6073 through the hook 6077, so that the counterweight 6075 drives the sliding handles 301 on both sides to slide on the potentiometer 3;One end of the potentiometer 3 is slidably connected to a sliding handle 301, and the other end of the potentiometer 3 is respectively provided with an input end 302, a common end 303, and an output end 304. The output end 304 of the potentiometer 3 is connected to the voltage input end of the control unit of the circuit breaker, so that the output end 304 and the common end 303 constitute the voltage output end of the potentiometer. It should be noted that the wiring method of the potentiometer is not limited to this, which depends on the actual model of the potentiometer. For low-end circuit breakers, they often do not have a control unit. In this case, the input end 302, the common end 303, and the output end 303 of the potentiometer can be led out through leads. When the user needs to detect the trigger of the circuit breaker, When the contact wear is detected, these terminals can be connected to appropriate additional devices for measurement without disassembling the circuit breaker to observe the contact wear; the sliding handles 301 on the two sets of potentiometers 3 are fixedly connected to the two sides of the counterweight block 6075, the input end 302 is connected to the voltage output end of the control unit of the circuit breaker, the common end 303 is connected to the ground end of the control unit of the circuit breaker, and the output end 304 is connected to the voltage input end of the control unit of the circuit breaker; the inner wall of the mounting housing 5 is provided with a symmetrical sliding groove 501, and a slider 502 is slidably connected in the symmetrical sliding groove 501, and one end of the slider 502 is fixedly connected to one end of the sliding rod 604, so that the first The second fixed frame 605 can move in the vertical direction when moving with the connecting line 4; the reset component 7 includes a symmetrical fixed plate 707, the inner wall of the symmetrical fixed plate 707 is fixedly installed with a positioning block 701, the inner side end of the positioning block 701 is provided with a slide groove, and a fixed rod 703 is fixedly connected in the slide groove, and a sliding block 702 is slidably connected to the fixed rod 703, and a spring 704 is sleeved on the fixed rod 703, and the spring 704 is located at the top of the sliding block 702, and a connecting plate 705 is fixedly connected to the upper part of one side surface of the sliding block 702, and a connecting rod 706 is fixedly connected to the top of the connecting plate 705. When the counterweight block 6075 moves, The connecting rods 706 on both sides can be driven to move, and the connecting rods 706 can drive the connecting plates 705 and the sliding blocks 702 to move, and compress the springs 704. The springs 704 are arranged so that the elastic force of the springs 704 can be used to reset the counterweight 6075 and the sliding handle 301. The reset assembly 7 is arranged to ensure the reset of the device, and ensure that the sliding handle 301 can always move in the vertical direction during the movement, thereby ensuring the accuracy of the monitoring data. The symmetrical fixing plates 707 are fixedly mounted on both sides of the inner wall of the mounting shell 5, and both ends of the counterweight 6075 are fixedly connected to one end of the connecting rod 706.The connecting assembly 8 includes two groups of rotating rods 801 rotatably arranged on the surface of one side of the sliding block 702, a mounting block 802 is fixedly connected to one side surface of the fixing plate 707 and located below the reset assembly 7, a positioning shaft 803 is fixedly connected to one side surface of the mounting block 802, the positioning shaft 803 is rotatably connected to the linkage plate 804 and the sliding block 805 respectively, the sliding block 805 can be rotated into the mounting block 802, and one end of the sliding block 805 is movably connected to one end of the linkage plate 804 through the rotating shaft, and the other end of the linkage plate 804 is movably connected to one end of the rotating rod 801 through the rotating shaft, and the sliding block The movement of 702 can drive the rotating rod 801 to contract, and the rotating rod 801 can drive the linkage plate 804 and the sliding block 805 to rotate on the positioning shaft 803; the connecting wire 4 is sequentially passed through the fixed pulley 602, the movable pulley 606, and the second fixed pulley 603 and is fixedly connected to the top of the second fixed frame 605 through the second connector 402, and the connecting wire 4 is made of electrically insulating tensile material, and the connecting wire 4 is made of nylon braided wire; the circuit breaker also includes a control unit, and the output end of the potentiometer 3 is electrically connected to the control unit of the circuit breaker to monitor the output voltage of the potentiometer in real time. The circuit breaker also includes The invention further comprises another control unit, wherein the input end of the potentiometer 3 is electrically connected to the control unit of the circuit breaker to obtain a constant input voltage from the control unit, and the control unit comprises a calculation unit for calculating the degree of contact wear of the circuit breaker after several on-off operations, wherein the degree of wear is expressed as |V0-Vi| / |V0-V1|, wherein V0 represents the output voltage measured for the first time when the contact of the circuit breaker is not worn out, V1 represents the output voltage measured when the contact of the circuit breaker is worn to the point of being unusable, and Vi represents the output voltage measured after several on-off operations of the circuit breaker, wherein V0 and V1 are respectively constant, the input voltage is between 0-5 volts; V0 and V1 are obtained in advance by conducting experiments on the same type of circuit breaker and stored in the control unit of the circuit breaker as known parameters, and also include setting a threshold for the contact wear degree. When the actual calculated contact wear degree value is greater than the threshold, the control unit outputs an alarm signal, which is a sound signal, an optical signal, or a combination of a sound signal and an optical signal. The method also includes outputting the calculated contact wear degree value to a display panel of the control unit for real-time display. The input voltage is set between 0-5 volts. ;

[0040] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0041] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0042] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for monitoring contact wear of a magnetic induction circuit breaker, comprising the following steps: S1; providing a potentiometer (3), the potentiometer (3) is fixedly mounted on the base (1) of the moving contact of the circuit breaker; S2: providing a connecting wire (4), and fixing one end of the connecting wire (4) on the contact finger of the moving contact of the circuit breaker, and the other end of the connecting wire (4) is passed through the fixed pulley (602), the moving pulley (606), and the second fixed pulley (603) in sequence and fixed on the top of the second fixed frame (605), and the connecting wire (4) is always in a maximum tension state, so that the movement of the contact finger (2) relative to the base (1) can drive the second fixed frame (605) to slide via the connecting wire (4), and the second fixed frame (605) drives the connecting block (6071), the hook (6077), the positioning ring (6076), and the counterweight (6075) to slide, so that the counterweight (6075) drives the sliding handle (301) to slide on the potentiometer (3), and monitoring is performed through the contact wear monitoring device; S3; connecting the input end of the potentiometer (3) to the control unit of the circuit breaker to obtain a constant input voltage from the control unit, connecting the output end of the potentiometer (3) to the control unit of the circuit breaker, and measuring the output voltage of the potentiometer when the moving contact of the circuit breaker is normally closed; calculating the degree of contact wear of the circuit breaker after a number of on-off cycles, wherein the degree of wear is expressed as |V0-Vi| / |V0-V1|, wherein V0 represents the output voltage measured for the first time when the contact of the circuit breaker is not worn, V1 represents the output voltage measured when the contact of the circuit breaker is worn to the point of being unusable, and Vi represents the output voltage measured after the circuit breaker is on and off a number of times; The contact wear monitoring device in S2 comprises a circuit breaker, a base (1), a contact finger (2), two potentiometers (3) and a connecting line (4), and is characterized in that: The contact finger (2) is mounted on the base (1) and is movable relative to the base (1); a cavity (101) is provided on the surface of the base (1); a mounting shell (5) is mounted in the cavity (101); a traction assembly (6) is mounted in the inner cavity of the mounting shell (5); a reset assembly (7) is arranged at the lower end of the traction assembly (6); and two potentiometers (3) are arranged on both sides of the reset assembly (7); one end of the connecting wire (4) is fixed to the contact finger (2) via a first connector (401); the other end is connected to the traction assembly (6) via a second connector (402); and the connecting wire (4) is always in a maximum tension state; The traction assembly (6) comprises a first fixed frame (601) fixedly mounted on the top of the inner cavity of the installation shell (5); the upper half of the first fixed frame (601) is rotatably connected to a fixed pulley (602) via a rotating shaft, and the lower half is rotatably connected to a second fixed pulley (603) via a rotating shaft; a second fixed frame (605) is arranged in the middle of the inner cavity of the installation shell (5); sliding rods (604) are fixedly connected to both sides of the second fixed frame (605), and the second fixed frame (605) is slidably connected to the inner wall of the installation shell (5) via the sliding rods (604); the inner cavity of the second fixed frame (605) is rotatably connected to a movable pulley (606) via a rotating bearing; and a stabilizing assembly (607) is arranged at the bottom of the second fixed frame (605); The stabilizing component (607) comprises a connecting block (6071) fixedly connected to the bottom of the second fixing frame (605); the surface of the connecting block (6071) is provided with four groups of sliding holes (6072) penetrating therethrough, and a sliding rod (6073) is slidably connected in the four groups of sliding holes (6072); the bottom end of the sliding rod (6073) is fixedly connected to a fixing block (6074), and the fixing block (6074) is installed at the bottom of the inner cavity of the installation shell (5); a hook (6077) is installed at the bottom of the connecting block (6071); a counterweight block (6075) is slidably connected to the sliding rod (6073); a positioning ring (6076) is fixedly connected to the top of the counterweight block (6075), and the hook (6077) is hung on the positioning ring (6076).

2. The contact wear monitoring method of a magnetic induction circuit breaker according to claim 1, characterized in that: One end of the potentiometer (3) is slidably connected to a sliding handle (301), and the other end of the potentiometer (3) is respectively provided with an input end (302), a common end (303), and an output end (304).

3. The contact wear monitoring method of a magnetic induction circuit breaker according to claim 2, characterized in that: The sliding handles (301) on the two groups of potentiometers (3) are fixedly connected to the two sides of the counterweight (6075), the input end (302) is connected to the voltage output end of the control unit of the circuit breaker, the common end (303) is connected to the ground end of the control unit of the circuit breaker, and the output end (304) is connected to the voltage input end of the control unit of the circuit breaker.

4. The contact wear monitoring method of a magnetic induction circuit breaker according to claim 1, characterized in that: A symmetrical sliding groove (501) is provided on the inner wall of the installation shell (5), and a sliding block (502) is slidably connected in the symmetrical sliding groove (501), and one end of the sliding block (502) is fixedly connected to one end of the sliding rod (604).

5. The contact wear monitoring method of a magnetic induction circuit breaker according to claim 4, characterized in that: The reset assembly (7) comprises a symmetrical fixed plate (707), a positioning block (701) is symmetrically fixedly installed on the inner wall of the fixed plate (707), a sliding groove is opened at the inner side end of the positioning block (701), and a fixed rod (703) is fixedly connected in the sliding groove, a sliding block (702) is slidably connected to the fixed rod (703), a spring (704) is sleeved on the fixed rod (703), and the spring (704) is located on the top of the sliding block (702), a connecting plate (705) is fixedly connected to the upper part of one side surface of the sliding block (702), and a connecting rod (706) is fixedly connected to the top of the connecting plate (705).

6. The contact wear monitoring method of a magnetic induction circuit breaker according to claim 5, characterized in that: The fixing plates (707) are symmetrically fixedly mounted on both sides of the inner wall of the mounting shell (5), and both ends of the counterweight block (6075) are fixedly connected to one end of the connecting rod (706).

7. The contact wear monitoring method of a magnetic induction circuit breaker according to claim 5, characterized in that: The connecting assembly (8) comprises two groups of rotating rods (801) rotatably arranged on one side surface of the sliding block (702); a mounting block (802) is fixedly connected to one side surface of the fixing plate (707) and located below the resetting assembly (7); a positioning shaft (803) is fixedly connected to one side surface of the mounting block (802); the positioning shaft (803) is rotatably connected to a linkage plate (804) and a sliding block (805), respectively; the sliding block (805) can be rotated into the mounting block (802); one end of the sliding block (805) is movably connected to one end of the linkage plate (804) via a rotating shaft; the other end of the linkage plate (804) is movably connected to one end of the rotating rod (801) via a rotating shaft.

8. The contact wear monitoring method of a magnetic induction circuit breaker according to claim 1, characterized in that: The connecting wire (4) is passed through the fixed pulley (602), the movable pulley (606), and the second fixed pulley (603) in sequence and is fixedly connected to the top of the second fixed frame (605) through the second connector (402). The connecting wire (4) is made of an electrically insulating tensile-resistant material. The connecting wire (4) is made of a nylon braided wire.

9. The contact wear monitoring method of a magnetic induction circuit breaker according to claim 1, characterized in that: The circuit breaker further comprises a control unit, the output end of the potentiometer (3) is electrically connected to the control unit of the circuit breaker so as to monitor the output voltage of the potentiometer in real time, the circuit breaker further comprises another control unit, the input end of the potentiometer (3) is electrically connected to the control unit of the circuit breaker so as to obtain a constant input voltage from the control unit, the control unit comprises a calculation unit for calculating the degree of contact wear of the circuit breaker after several on-off cycles, wherein the degree of wear is expressed as |V0-Vi| / |V0-V1|, wherein V0 represents the output voltage measured for the first time when the contacts of the circuit breaker are not worn out, V1 represents the output voltage measured when the contacts of the circuit breaker are worn to the point of being unusable, and Vi represents the output voltage measured after several on-off cycles of the circuit breaker, wherein V0 and V1 are respectively constants, and the magnitude of the input voltage is between 0 and 5 volts.

10. The contact wear monitoring method of a magnetic induction circuit breaker according to claim 9, characterized in that: V0 and V1 are obtained in advance by conducting experiments on circuit breakers of the same model and are stored in the control unit of the circuit breaker as known parameters. The method also includes setting a threshold value for the degree of contact wear. When the actual calculated value of the degree of contact wear is greater than the threshold value, the control unit outputs an alarm signal, which is a sound signal, an optical signal, or a combination of a sound signal and an optical signal. The method also includes outputting the calculated value of the degree of contact wear to a display panel of the control unit for real-time display. The input voltage is set between 0-5 volts.

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