Direct-current circuit breaker tripping device and control method

Abstract

The invention provides a direct-current circuit breaker tripping device and a control method. The direct-current circuit breaker tripping device comprises a breaking current constant value adjusting mechanism, a front tripping mechanism, a rear tripping mechanism, a conductive copper bar and a magnetic loop, the breaking current constant value adjusting mechanism is arranged on the circuit breaker bottom plate and is used for displaying the minimum current value of the tripping operation of the front tripping mechanism; the conductive copper bar penetrates through the middle of the magnetic loop, the magnetic loop is arranged on a side plate of the circuit breaker, the front tripping mechanism penetrates through the magnetic loop, the rear tripping mechanism is arranged on one side away from the front tripping mechanism, and the top of the front tripping mechanism is connected with the rear tripping mechanism through a lever. And the bottom of the front tripping mechanism is in transmission connection with the breaking current constant value adjusting mechanism. According to the device, the accuracy of equipment tripping work is guaranteed, the stability of mechanism operation is improved, the device has the advantages of being compact and simple in overall structure and high in integration level, assembly and later maintenance are facilitated, and the production cost and the use cost are reduced.

Description

Technical Field

[0001] The present application belongs to the technical field of circuit breakers, and in particular, relates to a DC circuit breaker tripping device and a control method. Background Art

[0002] In power plants, substations and other large-capacity, high-voltage power systems, the DC system provides reliable power for relay protection, operation control, signal sound, emergency lighting and other equipment. Small DC circuit breakers are one of the most important components in the DC system. Their stable and reliable operation will directly ensure the safety of the entire power system.

[0003] The existing DC circuit breaker tripping device has the following disadvantages: (1) The tripping structure of the circuit breaker body has only one main rod, with a compression spring at the lower end and a triangular armature at the upper end. The main rod is too long, the assembly size requirements are strict, and it is difficult to process. The force arm during the tripping movement is long, and deformation occurs after long-term operation; (2) The triangular armature has no guide structure. When the power is turned on and the armature is attracted, it first rotates to one side and then moves downward, causing the main body to release slowly, exceeding the tripping time required by the standard; (3) The tripping current mark is directly marked on the lower sleeve, and the scale distance is close, which is not easy to observe; when changing the tripping current value, the main rod compression spring block is directly adjusted, and the space is small and the operation is difficult; (4) The eddy current release and the main body release are separate and have no connection between them, which makes the two structures occupy a large space. In addition, the eddy current release structure is far away from the closing position, resulting in the situation that the eddy current cannot release. Summary of the invention

[0004] In view of this, the present application aims to provide a DC circuit breaker tripping device and a control method to solve at least one of the above problems.

[0005] To achieve the above purpose, the technical solution of this application is implemented as follows: In a first aspect, the present application provides a DC circuit breaker tripping device, comprising a breaking current fixed value adjustment mechanism, a front tripping mechanism, a rear tripping mechanism, a conductive copper busbar, and a magnetic circuit; The breaking current fixed value adjustment mechanism is arranged on the bottom plate of the circuit breaker, and the breaking current fixed value adjustment mechanism is used to display the minimum current value for the front tripping mechanism to perform a tripping operation; The conductive copper busbar passes through the middle of the magnetic circuit, the magnetic circuit is arranged on the side plate of the circuit breaker, the front tripping mechanism runs through the magnetic circuit, the rear tripping mechanism is arranged on the side away from the front tripping mechanism, the top of the front tripping mechanism is connected to the rear tripping mechanism through a lever, and the bottom of the front tripping mechanism is transmission-connected to the breaking current constant value adjustment mechanism.

[0006] In a second aspect, based on the same inventive concept, the present application further provides a DC circuit breaker tripping control method, which uses a DC circuit breaker tripping device as described in the first aspect, including: In response to the current in the main circuit exceeding the specified minimum current value, the magnetic circuit attracts the armature to drive the front fulcrum of the lever to move downward, the lever rotates along the rear fulcrum of the lever, and the right end of the lever moves downward to complete the tripping action.

[0007] Compared with the prior art, the DC circuit breaker tripping device and control method described in this application have the following beneficial effects: The present application discloses a DC circuit breaker tripping device and a control method, which ensures the accuracy of the device tripping operation and improves the stability of the mechanism operation. The device has the characteristics of compact and streamlined overall structure and high integration, is easy to assemble and maintain later, and reduces production and use costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0009] Figure 1 This is a schematic diagram of the first angle structure of a DC circuit breaker tripping device according to an embodiment of the present application; Figure 2 This is a schematic diagram of the structure of a DC circuit breaker tripping device according to an embodiment of the present application from a second angle; Figure 3 This is a schematic diagram of the internal structure of the breaking current fixed value adjustment mechanism described in the embodiment of the present application; Figure 4 It is a schematic diagram of the front tripping mechanism, the rear tripping mechanism and the lever connection structure described in the embodiment of the present application; Figure 5 A cross-sectional view of the front tripping mechanism described in an embodiment of the present application; Figure 6 This is a cross-sectional view of the rear tripping mechanism described in an embodiment of the present application.

[0010] Description of reference numerals: 1-breaking current fixed value adjustment mechanism; 11-outer frame; 12-marking wheel; 13-adjusting shaft; 14-worm; 15-first bevel gear; 16-transmission shaft; 17-turbine; 18-adjusting tool; 19-fixing bolt; 2-front release mechanism; 21-first sleeve; 22-fixing rod; 23-limiting rod; 24-armature; 25-first pressing member; 26-limiting rotating shaft; 27-limiting member; 28-washer; 29-lever damping plate; 210-second sleeve; 211-pressure cover; 212-plug; 213-screw; 214-spring; 2 15-second bevel gear; 216-flanged sleeve; 217-limiting pin; 218-fixed rod damping plate; 3-rear release mechanism; 31-coil outer frame; 32-coil; 33-third sleeve; 34-repulsion disk; 35-guide shaft; 36-spacer column; 37-manual push rod; 38-end; 39-second clamping member; 310-first return spring; 311-second return spring; 312-fixing member; 313-circuit spring; 314-sleeve flange; 4-magnetic circuit; 5-conductive copper busbar; 6-lever; 7-circuit breaker bottom plate; 8-circuit breaker side plate. DETAILED DESCRIPTION

[0011] In order to make the objectives, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0012] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should have the usual meanings understood by people with ordinary skills in the field to which the present application belongs. The words "first", "second" and similar words used in the embodiments of the present application do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprises" and other similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and other similar words are not limited to physical or mechanical connections, but can be

[0013] Including electrical connections, whether direct or indirect. "Up", "down", "left", "right", etc. are only used to indicate relative position relationships. When the absolute position of the object being described changes, the relative position relationship may also change accordingly.

[0014] See also Figure 1 and Figure 2 As shown, this embodiment provides a DC circuit breaker tripping device, including a breaking current fixed value adjustment mechanism 1, a front tripping mechanism 2, a rear tripping mechanism 3, a conductive copper bus 5 and a magnetic circuit 4; The breaking current fixed value adjustment mechanism 1 is arranged on the circuit breaker bottom plate 7, and the breaking current fixed value adjustment mechanism 1 is used to display the minimum current value for the front tripping mechanism 2 to perform a tripping operation; The conductive copper bus 5 passes through the middle of the magnetic circuit 4, the magnetic circuit 4 is arranged on the side plate 8 of the circuit breaker, the front tripping mechanism 2 is arranged through the magnetic circuit 4, the rear tripping mechanism 3 is arranged on the side away from the front tripping mechanism 2, the top of the front tripping mechanism 2 is connected to the rear tripping mechanism 3 through the lever 6, and the bottom of the front tripping mechanism 2 is transmission connected to the breaking current fixed value adjustment mechanism 1.

[0015] Specifically, in this embodiment, the device is mainly divided into three parts. The first part is a breaking current constant value adjustment mechanism 1, through which the minimum current value that needs to be broken in the main circuit of the circuit breaker can be conveniently and accurately set, and it can be intuitively displayed on a rotating wheel with a scale; the second part is a circuit breaker front tripping mechanism 2, when the current in the main circuit does not exceed the set minimum breaking current value, the mechanism will not disconnect the main circuit, when the current in the main circuit exceeds the set minimum breaking current value, the mechanism controls the moving contact to disconnect the main circuit; the third part is a circuit breaker rear tripping mechanism 3, through the circuit breaker control device, a short-time current is provided to the coil 32, and a repulsive force is generated between the metal disk and the coil 32 to control the moving contact to disconnect the main circuit. The mechanism can also be manually operated to complete the tripping operation of the mechanism.

[0016] The breaking current fixed value adjustment mechanism 1 is meshed with the front tripping mechanism 2 through bevel gears. The scale value displayed by the breaking current fixed value adjustment mechanism 1 is the minimum current value for the front tripping mechanism 2 to perform a tripping operation. The front tripping mechanism 2 is connected to the rear tripping mechanism 3 through a lever 6. They support each other when working separately and gain each other when working together, thereby ensuring the stability of the equipment's tripping operation. The tripping operation of the tripping device is realized by operating the lever 6.

[0017] A DC circuit breaker tripping device described in this embodiment ensures the accuracy of the equipment tripping operation and improves the stability of the mechanism operation. The device has the characteristics of compact, streamlined and highly integrated overall structure, is easy to assemble and maintain later, and reduces production and use costs.

[0018] In some embodiments, Figure 1 and Figure 3 As shown, the breaking current fixed value adjustment mechanism 1 includes an outer frame 11, and a value wheel 12 rotatably arranged in the outer frame 11, the value wheel 12 is engraved with scales, and a window is opened on one side of the outer frame 11 for displaying the scales on the value wheel 12; An adjusting shaft 13 for adjusting the rotation of the calibration wheel 12 is also rotatably disposed in the outer frame 11. One end of the adjusting shaft 13 is a polygonal structure, and the other end is provided with a first bevel gear 15. It also includes an adjustment tool 18 , in which an adjustment hole matching the polygonal structure is provided. The adjustment tool 18 is set on the outer frame 11 through a fixing bolt 19 , and the position of the adjusted adjustment tool 18 is fixed by the fixing bolt 19 .

[0019] Specifically, in this embodiment, the outer frame 11 of the mechanism is fixed on the circuit breaker base plate 7, the adjusting shaft 13 passes through the outer frame 11 longitudinally and is fixed, and can only rotate around the axial direction. The upper end of the adjusting shaft 13 is an outer hexagonal shape, and can be quickly rotated by an adjusting tool 18. A bevel gear is fixed to the other end, and a worm is fixed in the middle of the adjusting shaft 13; the transmission shaft 16 passes through the outer frame 11 horizontally and is fixed, and can only rotate around the axial direction. A value wheel 12 and a turbine 17 are installed in the middle section. The value wheel 12 is engraved with scales indicating the minimum current value of the disconnection, with numbers 4 to 9 on one side and numbers 10 to 16 on the other side. The turbine 17 is meshed with the worm 14. When the adjusting shaft 13 is rotated, the value wheel 12 is driven to rotate together.

[0020] The breaking current constant value adjustment mechanism 1 described in this embodiment magnifies the adjustment amount of the elastic part of the front tripping mechanism 2. The adjustment of the elastic part is more precise, making the setting of the minimum current value of the tripping more accurate and intuitive. The breaking current constant value adjustment mechanism 1 can be directly adjusted with tools, which simplifies the constant value adjustment work and improves work efficiency.

[0021] In some embodiments, the front tripping mechanism is a split structure consisting of upper and lower parts, wherein the upper component is connected to the lower component by an elastic member, the upper component is connected to the rear tripping mechanism by a lever for performing a tripping action, and the lower component is meshed and transmitted with the breaking current constant value adjustment mechanism for force value adjustment.

[0022] Specifically, in this embodiment, the front tripping mechanism is divided into upper and lower parts, the lower part is responsible for force adjustment, and the upper part is responsible for tripping. The two parts are connected by a spring, and the two parts work independently without affecting each other, which reduces the mutual interference of the mechanism movement, reduces the complexity of the mechanism, and improves the stability of the mechanism operation.

[0023] In some embodiments, Figure 1 , Figure 4 and Figure 5 As shown, the magnetic circuit 4 is formed by a plurality of silicon steel sheets stacked on the side plate 8 of the circuit breaker, openings are reserved above the plurality of silicon steel sheets, and the interior is hollow; An inner hole is provided in the magnetic circuit 4, and the upper component includes a first sleeve 21, a fixing rod 22, a limiting rod 23 and an armature 24. The first sleeve 21 is installed in the inner hole, and the fixing rod 22 is located in the first sleeve 21. The fixing rod 22 passes through the armature 24 and the first pressing member 25, and is fixed in position by a nut. The first pressing member 25 serves as a front fulcrum of the lever and is arranged on the lever 6 by a limiting rotating shaft 26. The limiting rod 23 passes through the armature 24, and the top of the limiting rod 23 is fixed by a nut, and the bottom is arranged on the first sleeve 21 by a limiting member 27. The limiting member 27 is used to limit the position of the limiting rod 23. A limiting protrusion is provided at the bottom of the fixing rod 22, the upper end surface of the limiting protrusion contacts the bottom end surface of the first sleeve 21, and a fixing rod damping sheet 218 is also provided between the lower end surface of the limiting protrusion and the inner hole end surface of the second sleeve; A first protrusion is provided on the first sleeve 21 , and a plurality of washers 28 are installed between the upper end surface of the first protrusion and the limiting member 27 .

[0024] Specifically, in this embodiment, the back of the magnetic circuit 4 (formed by a plurality of stacked silicon steel sheets) is fixed on the circuit breaker side plate 8, the lower end of the first sleeve 21 is processed with an external thread, and the upper end of the second sleeve 210 is processed with an internal thread, and the two pass through the through hole of the magnetic circuit 4 and are tightened and fixed together; the upper end of the fixing rod 22 is processed with an external thread, passes through the first sleeve 21 and is fixed together with the triangular armature 24 and the first clamping piece 25 by a nut, and the first clamping piece 25 is arranged on the lever 6 through the limiting rotating shaft 26 as the front fulcrum of the lever 6 (it should be noted that there are two levers 6 in this embodiment, and a gap is reserved between the two levers 6, and the first clamping piece 25 after installation is located in the gap). The upper end of the limit rod 23 is processed with an external thread, which passes through the triangular armature 24 and the lever shock absorber 29, and the three are fixed together by a nut. The limit rod 23 passes through the front end round hole of the limit member 27 for limiting, and the rear end slotted hole of the limit member 27 is inserted into the upper end of the upper sleeve, and a washer 28 is provided below to adjust the height. By tightening the bolts, the slot is contracted and clamped to fix the first sleeve 21.

[0025] In some embodiments, Figure 1 , Figure 4 and Figure 5 As shown, the lower component includes a second sleeve 210, and a gland 211, a plug 212 and a lead screw 213 disposed in the second sleeve 210; The second sleeve 210 is installed in the inner hole (the outer wall of the second sleeve 210 also extends outward with a boss, and the upper end surface of the boss is in contact with the magnetic circuit 4 formed by the silicon steel sheet. In order to prevent the second sleeve 210 from rotating, a limit pin 218 is provided on one side of the boss, and the limit pin 218 is inserted into the magnetic circuit), and the top end of the second sleeve 210 is threadedly connected with the bottom end of the first sleeve 21, the fixing rod 22 extends into the second sleeve 210 and contacts with the top end surface of the gland 211, the elastic member (spring 214) is installed in the second sleeve 210, the top end of the elastic member abuts with the gland 211, the lead screw 213 is threadedly connected with the plug 212, and the bottom end of the elastic member abuts with the upper end surface of the plug 212; A second bevel gear 215 is mounted on the lead screw 213 , and the second bevel gear 215 is meshed with the first bevel gear 15 . The bottom end of the lead screw 213 is disposed on the circuit breaker bottom plate 7 via a first flanged sleeve 216 .

[0026] Specifically, in the present embodiment, the shock absorbing gasket of the fixing rod 22 is placed in the second sleeve 210, and when the fixing rod 22 moves downward, it plays the role of shock absorbing and limiting; one end of the spring 214 is supported on the tail end of the fixing rod 22 through the pressure cover 211, and the other end is supported on the plug 212. The plug 212 is processed with an internal thread. The plug 212 moves up and down through the forward and reverse rotation of the screw 213 to compress or release the spring 214, thereby providing different thrusts to the fixing rod 22. The first flanged sleeve 216 is fixed on the circuit breaker bottom plate 7, and the screw 213 is placed on it. The second bevel gear 215 is fixed on the screw 213 through a flat key and meshes with the first bevel gear 15 of the breaking current constant value adjustment mechanism 1.

[0027] The front tripping mechanism 2 described in this embodiment is divided into an upper and lower structure. The lower component is responsible for force adjustment, and the upper component is responsible for tripping. The two parts are connected by a spring 214. The two parts do not affect each other and work independently, which reduces the mutual interference of the mechanism movement, reduces the complexity of the mechanism, and improves the stability of the mechanism operation.

[0028] In some embodiments, Figure 2 , Figure 4 and Figure 6 As shown, the rear tripping mechanism 3 includes a coil outer frame 31, a coil 32, a third sleeve 33, a repulsive disk 34, a guide shaft 35, a spacer column 36, a manual ejector rod 37, an end 38, a second pressing member 39, a first return spring 310 and a second return spring 311; The coil outer frame 31 is arranged on the circuit breaker side plate 8, and the coil outer frame 31 and the coil 32 are arranged in one piece. The third sleeve 33 is located in the middle hole formed by the coil 32, and the guide shaft 35 is located in the third sleeve 33. The top end of the guide shaft 35 is fixed on the circuit breaker side plate 8. The repulsion disk 34, the spacer column 36, the second pressing member 39 and the first return spring 310 are sequentially sleeved on the guide shaft 35, and the second pressing member 39 is rotatably connected to the lever 6 to serve as the rear fulcrum of the lever 6. The manual ejector rod 37 is arranged on the circuit breaker side plate 8 through the fixing member 312. The top end of the manual ejector rod 37 contacts the bottom end of the third sleeve 33. The manual ejector rod 37 is provided with an internal groove, in which a retaining spring 313 is installed. The return spring 214 is located between the retaining spring 313 and the fixing member 312. The end head 38 is arranged at the bottom end of the manual push rod 37 . A through hole for the end head 38 to pass through is opened on the circuit breaker bottom plate 7 . A second flanged sleeve 216 is arranged in the through hole. The end head 38 is limited in position by the second flanged sleeve 216 .

[0029] Specifically, in this embodiment, the coil 32 is cast in the coil outer frame 31 as a whole, the coil outer frame 31 is fixed on the circuit breaker side plate 8, the guide shaft 35 is fixed inside the circuit breaker side plate 8, and the first reset spring 310, the second pressing member 39, the spacer column 36, and the repulsion disk 34 pass through the middle. The first reset spring 310 ensures that the initial state of each component fits each other, and resets each component after the tripping action is completed. The repulsion disk 34 is located on the coil outer frame 31, and the guide shaft 35 is below. The end is inserted into the third sleeve 33, the third sleeve 33 is placed in the middle hole of the coil 32, one end of the manual push rod 37 is pressed against the lower end of the third sleeve 33, and the other end is fixed with a metal end 38, the upper end of the second reset spring 311 is pressed against the circuit breaker side plate 8, and the lower end is pressed against the retaining spring 313 on the manual push rod 37, ensuring that the push rod is at the lower end in the initial state and when resetting, the second flanged sleeve 216 is fixed on the circuit breaker bottom plate 7, and the end 38 is clamped on the second sleeve flange 314 for limiting.

[0030] The rear tripping mechanism 3 described in this embodiment integrates the functions of repulsion tripping and manual tripping. The final tripping actions of the two are the same, but the manual tripping component does not affect the movement of the repulsion tripping component, thereby ensuring the stability of the operation of the repulsion tripping component. The repulsion tripping reacts quickly, providing double protection for the equipment tripping.

[0031] The working principle of the tripping device described in this embodiment is: When the adjusting shaft 13 is rotated, the worm 14 and the bevel gear rotate synchronously, the worm 14 drives the turbine 17 to rotate, and then drives the value wheel 12 to rotate synchronously, the second bevel gear 215 drives the screw 213 to rotate through the meshing first bevel gear 15, and the rotation of the screw 213 drives the plug 212 to move up and down to compress and release the spring 214. The transmission ratio between the bevel gears is 1:1, and the transmission ratio between the turbine 17 and the worm 14 is 20:1. Therefore, when the value wheel 12 rotates 1 circle, the screw 213 rotates 20 circles, which amplifies the adjustment amount and facilitates accurate adjustment.

[0032] The conductive copper bar 5 of the main circuit passes through the middle of the magnetic circuit 4. When current passes through the conductive copper bar 5, a circular magnetic field centered on the conductive copper bar 5 will be generated around it. After the magnetic field is generated in the magnetic circuit 4, an electromagnet is formed to attract the triangular armature 24 to move downward, driving the first clamping piece 25 and the limit rod 23 on the armature 24 to move together to complete the tripping action. The spring 214 at the bottom of the device provides a reaction force. The greater the reaction force, the greater the suction force required for the tripping action, and the stronger the magnetic field in the magnetic circuit 4, and the greater the minimum current passing through the conductive copper bar 5, thereby limiting the size of the current passing through the circuit.

[0033] When the coil 32 of the rear tripping mechanism 3 is energized, a magnetic field is generated instantly, and the magnetic field suddenly changes from nothing to something, so that an induced electromotive force and an induced current are generated inside the repulsion disk 34 made of metal material placed on the coil 32. The induced current forms a loop inside, and the magnetic field corresponding to the induced current is opposite to the magnetic field generated by the coil 32, so that a repulsive force is generated between the repulsion disk 34 and the coil 32, and the rear fulcrum of the lever 6 is pushed to move upward along the guide shaft 35 through the spacing column 36. At this time, the lever 6 rotates along the front fulcrum of the lever, and the right end of the lever 6 moves downward to complete the tripping action, and then the reset spring 214 completes the reset.

[0034] When manually tripping, the end 38 is pushed, so that the manual push rod 37 pushes the repulsion disk 34 upward through the third sleeve 33 to complete the tripping action, and the second reset spring 311 resets the manual push rod 37. The rest is similar and will not be repeated.

[0035] Based on the same inventive concept, corresponding to any of the above-mentioned embodiments, an embodiment of the present application further provides a DC circuit breaker tripping control method, including: In response to the current in the main circuit exceeding the specified minimum current value, the magnetic circuit attracts the armature to drive the front fulcrum of the lever to move downward, the lever rotates along the rear fulcrum of the lever, and the right end of the lever moves downward to complete the tripping action.

[0036] Specifically, in the present embodiment, when the current in the main circuit exceeds the specified minimum current value, the magnetic circuit 4 of the front tripping mechanism 2 attracts the triangular armature 24 to overcome the reaction force of the lower spring 214 and move downward, driving the front fulcrum of the lever to move downward, and the lever 6 rotates along the rear fulcrum of the lever, and the right end of the lever 6 moves downward to complete the tripping action, after which the thrust of the lower spring 214 completes the reset. When the eddy current device (i.e., the rear tripping mechanism 3) and the electromagnetic device (i.e., the front tripping mechanism 2) work together, the two gain each other, and the right end of the lever 6 moves downward at a faster speed to complete the tripping action.

[0037] The method of the above embodiment is used to implement the corresponding device in any of the above embodiments, and has the beneficial effects of the corresponding device embodiment, which will not be described in detail here.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

[0039] The embodiments of the present application are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present application should be included in the scope of protection of the present application.

Claims

1. A DC circuit breaker tripping device, characterized in that: It includes a breaking current fixed value adjustment mechanism, a front tripping mechanism, a rear tripping mechanism, a conductive copper busbar and a magnetic circuit; The breaking current fixed value adjustment mechanism is arranged on the bottom plate of the circuit breaker, and the breaking current fixed value adjustment mechanism is used to display the minimum current value for the front tripping mechanism to perform a tripping operation; The conductive copper busbar passes through the middle of the magnetic circuit, the magnetic circuit is arranged on the side plate of the circuit breaker, the front tripping mechanism runs through the magnetic circuit, the rear tripping mechanism is arranged on the side away from the front tripping mechanism, the top of the front tripping mechanism is connected to the rear tripping mechanism through a lever, and the bottom of the front tripping mechanism is transmission-connected to the breaking current constant value adjustment mechanism.

2. A DC circuit breaker tripping device according to claim 1, characterized in that: The breaking current fixed value adjustment mechanism comprises an outer frame, and a value wheel rotatably arranged in the outer frame, the value wheel is engraved with scales, and a window is opened on one side of the outer frame for displaying the scales on the value wheel; An adjusting shaft for adjusting the rotation of the calibration wheel is also rotatably arranged in the outer frame, one end of the adjusting shaft is arranged in a polygonal structure, and the other end is arranged with a first bevel gear.

3. A DC circuit breaker tripping device according to claim 2, characterized in that: It also includes an adjustment tool, in which an adjustment hole matching the polygonal structure is arranged, and the position of the adjustment tool is fixed by a fixing bolt.

4. A DC circuit breaker tripping device according to claim 2, characterized in that: The front tripping mechanism is a split structure consisting of upper and lower parts, wherein the upper component is connected to the lower component by an elastic member, the upper component is connected to the rear tripping mechanism by a lever for performing a tripping action, and the lower component is meshed and transmitted with the breaking current constant value adjustment mechanism for force value adjustment.

5. A DC circuit breaker tripping device according to claim 4, characterized in that: The magnetic circuit is formed by a plurality of silicon steel sheets stacked and arranged on the side plate of the circuit breaker, openings are reserved above the plurality of silicon steel sheets, and the interior is hollow; The magnetic circuit is provided with an inner hole passing through it, the upper component comprises a first sleeve, a fixing rod, a limiting rod and an armature, the first sleeve is installed in the inner hole, the fixing rod is located in the first sleeve, the fixing rod passes through the armature and the first pressing member, and is fixed in position by a nut, the first pressing member serves as a front fulcrum of the lever, and is arranged on the lever through a limiting rotating shaft, the limiting rod passes through the armature, the top of the limiting rod is fixed by a nut, and the bottom is arranged on the first sleeve through a limiting member; A limiting protrusion is provided at the bottom of the fixing rod, and an upper end surface of the limiting protrusion contacts the bottom end surface of the first sleeve.

6. A DC circuit breaker tripping device according to claim 5, characterized in that: The first sleeve is provided with a first protrusion, and a plurality of washers are installed between the upper end surface of the first protrusion and the limiting member.

7. A DC circuit breaker tripping device according to claim 4, characterized in that: The lower component includes a second sleeve, and a gland, a plug and a lead screw arranged in the second sleeve; The second sleeve is installed in the inner hole, and the top end of the second sleeve is threadedly connected to the bottom end of the first sleeve, the fixing rod extends into the second sleeve and contacts the top end surface of the gland, the elastic member is installed in the second sleeve, the top end of the elastic member abuts against the gland, the lead screw is threadedly connected to the plug, and the bottom end of the elastic member abuts against the upper end surface of the plug; The lead screw is provided with a second bevel gear, the second bevel gear is meshed with the first bevel gear, and the bottom end of the lead screw is arranged on the circuit breaker bottom plate through a first flanged sleeve.

8. A DC circuit breaker tripping device according to claim 1, characterized in that: The rear release mechanism includes a coil outer frame, a coil, a third sleeve, a repulsion disk, a guide shaft, a spacer column, a manual ejector rod, an end, a second pressing member, a first return spring, and a second return spring; The coil outer frame is arranged on the circuit breaker side plate, the coil outer frame and the coil are arranged in one piece, the third sleeve is located in the middle hole formed by the coil, the guide shaft is located in the third sleeve, the top end of the guide shaft is fixed on the circuit breaker side plate, the repulsion disk, the spacer column, the second clamping member and the first return spring are sequentially sleeved on the guide shaft, and the second clamping member is rotatably connected to the lever to serve as a rear fulcrum of the lever; The manual ejector rod is arranged on the side plate of the circuit breaker through a fixing piece, the top end of the manual ejector rod contacts the bottom end of the third sleeve, a built-in groove is provided on the manual ejector rod, a retaining spring is arranged in the built-in groove, and the reset spring is located between the retaining spring and the fixing piece; The end head is arranged at the bottom end of the manual push rod, and a through hole for the end head to pass through is opened on the bottom plate of the circuit breaker.

9. A DC circuit breaker tripping device according to claim 8, characterized in that: A second flanged sleeve is arranged in the through hole, and the end head is position-limited by the second flanged sleeve.

10. A DC circuit breaker tripping control method, using a DC circuit breaker tripping device according to any one of claims 1 to 9, characterized in that: include: In response to the current in the main circuit exceeding the specified minimum current value, the magnetic circuit attracts the armature to drive the front fulcrum of the lever to move downward, the lever rotates along the rear fulcrum of the lever, and the right end of the lever moves downward to complete the tripping action.

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