Switching-on and switching-off device for moving contact of direct-current circuit breaker

Abstract

The invention provides an opening and closing device for a moving contact of a direct-current circuit breaker. The opening and closing device comprises an auxiliary signal mechanism and a linkage mechanism which are in contact connection, the linkage mechanism comprises a moving contact, a sliding block, a shifting fork and an arc contact, the moving contact is hinged to a copper bar of the direct-current circuit breaker, the sliding block is arranged on the moving contact, the shifting fork is arranged on the periphery of the moving contact and clamped with the sliding block, the end, away from the sliding block, of the shifting fork is connected with the electromagnetic executing mechanism, and the arc contact is rotationally arranged at the top end of the moving contact. A first elastic piece is arranged between one end part of the arc contact and the end surface of the top end of the moving contact; the auxiliary signal mechanism comprises an auxiliary contact component and an opening component, an opening rod of the opening component is in contact with an opening shaft of the auxiliary contact component, and an opening end of the opening component is in contact connection with the bottom of the moving contact. According to the invention, the quick response of the opening and closing device can be realized, the time for opening and closing is reduced, the overall stability of the system is high, and the product performance is improved.

Description

Technical Field

[0001] The present application belongs to the technical field of circuit breakers, and in particular relates to a moving contact opening and closing device of a DC circuit breaker. Background Art

[0002] The DC circuit breaker moving contact opening and closing device is composed of an auxiliary signal mechanism and a linkage mechanism connected to each other. The working principle of the auxiliary signal mechanism is to directly weld a small micro switch on the printed circuit board, press and release the micro switch roller lever through a metal sheet metal box fixed on a metal shaft that can slide back and forth to control the micro switch on and off; the front end of the sliding shaft is painted green, and a red rubber sheet with a cross cut in the middle can be passed through to indicate the opening and closing state of the moving contact. A through hole is machined on the moving contact, and a metal shaft is fixed with a shaft elastic retaining ring. A hollow roller is inserted into each end of the metal shaft, and the roller is limited by the shaft elastic retaining ring, and the shift fork is placed on top of the roller. The movement process of the linkage mechanism is as follows: when the closing mechanism is energized, the shift fork is pushed forward, and the shift fork boss pushes the roller, causing the moving contact to move toward the static contact, and the moving and static contacts are pressed together to complete the closing; when the opening mechanism is energized, the shift fork is pushed upward, the shift fork boss is disengaged from the roller, and the moving contact leaves the static contact under the action of the opening spring, and finally stops at the initial position to complete the opening.

[0003] However, the common DC circuit breakers on the market currently have at least the following problems:

[0004] For the auxiliary signal mechanism, firstly, the small micro switch is directly welded on the printed circuit board, the micro switch trigger stroke is small, and the groove of the sheet metal box triggered by the mechanism is shallow, so when the micro switch is close to the sheet metal box, the micro switch will be damaged by overpressure, and when the micro switch is far away from the sheet metal box, the triggering action cannot be completed. Secondly, the micro switches are closely arranged front and back. As the silver point is ablated during use, the thickness decreases, and the compression stroke of the opening spring shaft becomes larger. When closing the switch, the sheet metal box moves to the left side of the figure. The groove moves too far and the transmission signal is wrong. Furthermore, in the original scheme of the opening spring mechanism, the inner sleeve of the mechanism is directly fixed on the support plate and cannot move. The contact surface between the moving contact and the end of the outer sleeve is a plane, the friction force is large, and there is a large fluctuation. The outer sleeve of the mechanism and the opening shaft play a guiding role together. The movement trajectory of the moving contact during the opening and closing process is a fan, so the outer sleeve and the inner shaft of the mechanism will always be subject to the constantly changing force of the vertical axis. After long-term operation, the opening shaft will loosen and the outer sleeve will crack.

[0005] For the linkage mechanism, firstly, the pressure of the shift fork on the roller is relatively large when closing the circuit breaker, so the sliding friction between the roller and the metal shaft is greater than the rolling friction between the roller and the shift fork. The moving contact rotates around the axis during the closing process, causing the roller and the metal shaft to be relatively still, and rolling with the shift fork. As a result, after the moving contact completes the closing action and becomes still, the shift fork will appear to bend up. After the number of operations increases, friction loss will occur between the shift fork boss and the outer surface of the roller, resulting in the circuit breaker being tripped and unable to close. Secondly, the roller is a hollow structure. During the closing process, the shift fork will impact the roller. As the number of times accumulates, the roundness of the roller will decrease. The roller can rotate freely on the metal shaft. After the roller loses its roundness, the roller surfaces contacted by the left and right rods of the shift fork will be inconsistent when closing the switch. When opening the switch, the left and right rods of the shift fork are subjected to different forces. In addition, the left and right rods of the shift fork are processed from a piece of material. The internal stress generated by processing and heat treatment will cause the two shift fork rods to be inconsistent and unable to be completely leveled. These two reasons make the left and right rods of the shift fork inconsistent in action, resulting in the situation of re-opening after opening, causing the circuit breaker to fail to open and burn electrical components. Furthermore, the silver contact point is directly welded to the moving contact. The arc generated during opening directly burns the silver point. After the silver point is burned, the moving contact can only be replaced, which is costly and difficult and cumbersome to replace. Summary of the invention

[0006] In view of this, the present application aims to provide a DC circuit breaker moving contact opening and closing device to solve at least one of the above problems.

[0007] To achieve the above purpose, the technical solution of this application is implemented as follows:

[0008] The present application provides a DC circuit breaker moving contact opening and closing device, including an auxiliary signal mechanism and a linkage mechanism in contact connection;

[0009] The linkage mechanism comprises a moving contact, a slider, a shift fork and an arc contact, wherein the moving contact is hinged to the copper bar of the DC circuit breaker and electrically connected to the copper bar, the slider is arranged on the moving contact, the shift fork is arranged on the periphery of the moving contact and is engaged with the slider, one end of the shift fork away from the slider is connected to the electromagnetic actuator, the arc contact is rotatably arranged at the top end of the moving contact, and a first elastic member is arranged between one end of the arc contact and the top end face of the moving contact;

[0010] The auxiliary signal mechanism includes an auxiliary contact component and a trip component. The auxiliary contact component is arranged in the chassis, and the trip component is arranged on the frame support plate. The trip rod of the trip component is in contact with the trip shaft of the auxiliary contact component, and the trip end of the trip component is in contact and connected with the bottom of the moving contact.

[0011] Furthermore, the shift fork comprises two separate shift fork rods, the two shift fork rods are located on both sides of the moving contact, and a boss is extended upward from the upper end surface of the shift fork rod.

[0012] Furthermore, the number of the sliders is two, and the two sliders are correspondingly arranged on the two side walls of the moving contact, and one end face of the slider adjacent to the boss is an arcuate surface, and the arcuate surface is tangent to the top end face of the slider, and a groove is provided on the arcuate surface of the slider, and the groove matches the boss;

[0013] The bottom end surface of the sliding block is in contact with the upper end surface of the shift fork rod.

[0014] Furthermore, a connection portion is extended upward from the top end surface of the moving contact, and a stop groove is provided at the bottom end of the arc contact, the stop groove is correspondingly arranged on the connection portion, and the arc contact is connected to the connection portion by a fixed pin shaft and a split pin;

[0015] A notch is provided on a side wall of the top end of the moving contact away from the silver point, a mounting hole is provided at the notch, the first elastic member is arranged above the mounting hole, the top end of the first elastic member is against the arc contact, the clamping bolt passes through the moving contact, and the first elastic member is arranged in the mounting hole.

[0016] Furthermore, the auxiliary contact member comprises an outer frame, a trigger block, a micro switch, a trip shaft and a prompt block, the outer frame is fixed in the chassis, and the outer frame has a built-in placement space, and the trigger block is installed in the placement space;

[0017] There are multiple micro switches, which are respectively arranged on both sides of the outer frame. The prompt block is rotatably arranged at one end of the outer frame. A second elastic member is arranged between the end of the trigger block close to the prompt block and the outer frame. The opening shaft passes through the outer frame, the trigger block, the second elastic member, contacts the prompt block, and drives the prompt block to rotate.

[0018] Furthermore, the number of the micro switches is four groups, and they are symmetrically arranged on the outer walls of both sides of the outer frame, and a gap is reserved on the outer frame for the roller lever of the micro switch to move.

[0019] Furthermore, a mounting bracket is provided at one end of the outer frame, and the prompt block is rotatably arranged on the mounting bracket via a rotating shaft;

[0020] The mounting bracket is also provided with a limiting rod for limiting the prompt block.

[0021] Furthermore, a through hole is provided on one side panel of the chassis, and the prompt block is arranged corresponding to the through hole. The prompt block is in a fan-shaped structure, and a two-color rubber sheet is pasted thereon.

[0022] Furthermore, the second elastic member is a reset spring, and the reset spring is sleeved on the opening shaft. An inner groove is annularly provided on the opening shaft, and a retaining spring is installed in the inner groove for limiting the reset spring.

[0023] Furthermore, the opening brake component includes an opening brake base, an outer sleeve, an inner sleeve, an opening brake spring, an embedded component, an opening brake rod and an opening brake end;

[0024] The gate-opening base is arranged on the frame support plate, and an arc-shaped groove is provided on one side of the gate-opening base, and the tail of the inner sleeve is arranged as an arc-shaped protrusion and is correspondingly arranged in the arc-shaped groove;

[0025] One end of the opening rod is installed in the outer sleeve through an embedded part, the opening spring is sleeved on the opening rod, and the opening spring is installed in the outer sleeve through the inner sleeve, and the other end of the opening rod passes through the inner sleeve and the arc-shaped groove, and extends into the chassis, and contacts with the opening shaft;

[0026] A groove in an arc-shaped structure is provided at the bottom of the moving contact, and an arc-shaped structure matching with the groove is provided on the opening end.

[0027] Compared with the prior art, the DC circuit breaker moving contact opening and closing device described in the present application has the following beneficial effects:

[0028] A DC circuit breaker moving contact opening and closing device described in the present application realizes a rapid response of the opening and closing device, reduces the time taken for opening and closing, and effectively improves the output stability of the opening and closing signals, through structural design of the auxiliary signal mechanism and the linkage mechanism, combining the structural characteristics of the auxiliary signal mechanism and the structural characteristics of the linkage mechanism. The entire device structure moves smoothly, the overall system stability is high, and the product performance is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] 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:

[0030] Figure 1 This is a schematic structural diagram of a DC circuit breaker moving contact opening and closing device according to an embodiment of the present application;

[0031] Figure 2 This is a schematic diagram of the first angle structure of a DC circuit breaker moving contact opening and closing linkage mechanism according to an embodiment of the present application;

[0032] Figure 3 This is a schematic diagram of the second angle structure of a DC circuit breaker moving contact opening and closing linkage mechanism according to an embodiment of the present application;

[0033] Figure 4 This is a schematic diagram of the shift fork structure described in an embodiment of the present application;

[0034] Figure 5 This is a schematic diagram of the slider structure described in an embodiment of the present application;

[0035] Figure 6 This is a schematic diagram of the structure of a DC circuit breaker moving contact opening and closing auxiliary signal mechanism according to an embodiment of the present application;

[0036] Figure 7 This is a schematic diagram of the internal structure of the auxiliary contact component according to an embodiment of the present application;

[0037] Figure 8 This is a schematic diagram of the structure of the gate-opening component described in an embodiment of the present application;

[0038] Fig. 9 This is a cross-sectional view of a DC circuit breaker moving contact opening and closing auxiliary signal mechanism described in an embodiment of the present application.

[0039] Description of reference numerals:

[0040] 1-moving contact; 101-connecting part; 102-notch; 103-silver dot; 104-groove; 2-copper busbar; 3-shift fork; 301-shift fork rod; 302-boss; 4-slider; 401-groove; 402-threaded rod; 403-nut; 5-arc contact; 501-fixing pin; 502-split pin; 6-connecting piece; 7-pressing bolt; 8-first elastic piece; 9-chassis; 901-through hole; 10-auxiliary contact member; 1001-outer frame; 1002-trigger block ;1003-micro switch;1004-disconnect shaft;1005-prompt block;1006-mounting bracket;1007-rotating shaft;1008-limit rod;1009-reset spring;10010-circlip;11-disconnect component;1101-disconnect base;1102-outer sleeve;1103-inner sleeve;1104-disconnect spring;1105-embedded part;1106-disconnect rod;1107-disconnect end;1108-arc-shaped protrusion;1109-arc-shaped groove. DETAILED DESCRIPTION

[0041] 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.

[0042] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should be the usual meanings understood by people with ordinary skills in the field to which the present application belongs. The "first", "second" and similar words used in the embodiments of the present application do not represent any order, quantity or importance, but are only used to distinguish different components. "Including" or "comprising" and similar words mean that the elements or objects appearing in front of the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0043] See also Figure 1 As shown, this embodiment provides a DC circuit breaker moving contact opening and closing device, including an auxiliary signal mechanism and a linkage mechanism that are in contact connection;

[0044] like Figure 2 and Figure 3 As shown, the linkage mechanism includes a moving contact 1, a slider 4, a shift fork 3 and an arc contact 5. The moving contact 1 is hinged to the copper bar 2 of the DC circuit breaker and is electrically connected to the copper bar 2. The slider 4 is arranged on the moving contact 1. The shift fork 3 is arranged on the periphery of the moving contact 1 and is engaged with the slider 4. One end of the shift fork 3 away from the slider 4 is connected to an electromagnetic actuator. The electromagnetic actuator (the electromagnetic actuator described in this embodiment is a conventional mechanism in the art, such as a solenoid valve, etc., which will not be described in detail here, and the electromagnetic actuator is not shown in the drawings) drives the shift fork 3 to push the moving contact 1 to rotate around the copper bar 2 by squeezing the slider 4;

[0045] The arc contact 5 is rotatably arranged at the top of the moving contact 1, and a first elastic member 8 is arranged between one end of the arc contact 5 and the top end surface of the moving contact 1, and the first elastic member 8 is used to keep the arc contact 5 in a forward extending state;

[0046] like Figure 6 As shown, the auxiliary signal mechanism includes an auxiliary contact component 10 and a disconnecting component 11. The auxiliary contact component 10 is arranged in the chassis 9, and the disconnecting component 11 is arranged on the frame support plate. The disconnecting rod 1106 of the disconnecting component 11 is in contact with the disconnecting shaft 1004 of the auxiliary contact component 10, and the disconnecting end 1107 of the disconnecting component 11 is in contact and connected with the bottom of the moving contact 1.

[0047] Specifically, in this embodiment, the linkage mechanism used fixes the slider 4 on the moving contact 1, cooperates with the fork 3 arranged on the periphery of the moving contact 1, the fork 3 is engaged with the slider 4, and the fork 3 is driven by the electromagnetic actuator to push the moving contact 1 to rotate around the copper bus 2 through the slider 4. At the same time, an arc contact 5 is arranged on the top of the moving contact 1, and a thrust is applied by an elastic member to contact or disconnect the silver point 103, thereby protecting the silver point 103 from being burned by the electric arc. When the arc contact 5 is burned, it only needs to be replaced.

[0048] The opening device described in the present embodiment realizes a rapid response of the opening and closing device by structurally designing the auxiliary signal mechanism and the linkage mechanism, combining the structural characteristics of the auxiliary signal mechanism and the linkage mechanism, thereby reducing the time taken for opening and closing, and effectively improving the output stability of the opening and closing signals. The entire device structure moves smoothly, the overall system stability is high, and the product performance is improved.

[0049] In some embodiments, Figure 4 As shown, the shift fork 3 includes two split shift fork rods 301, the two shift fork rods 301 are located on both sides of the moving contact 1, and a boss 302 extends upward from the upper end surface of the shift fork rod 301;

[0050] The shift fork rod 301 is connected to the electromagnetic actuator through a connecting piece 6. A fixing hole is provided in the connecting piece 6. The end of the shift fork rod 301 penetrates into the fixing hole and is fixed in the fixing hole by adhesive.

[0051] Specifically, in this embodiment, the present application improves the integrally processed fork 3 into a split fork 3 for the left and right rods, and at the same time reduces the height of the boss 302 on the previous fork rod 301, and the fork rod 301 is placed on the roller and modified to the fork rod 301 pressing the slider 4 from below, such as Figures 2 to 4 shown.

[0052] The original fork is processed as a whole. Since the fork rod 301 is slender, internal stress will be generated during processing and heat treatment, causing the fork rod 301 to deform. Even if it is reshaped, it is difficult to make it consistent and completely parallel. The height of the fork rod boss 302 in the original scheme is 6.5mm, and the roller radius is 5mm.

[0053] After the design improvement of the present application, the length of the fork rod 301 is shortened, the internal stress generated during the processing and heat treatment process is reduced, and the fork rod 301 is prevented from deformation. The left and right rods can be easily made completely consistent through the assembly tool. The height of the boss 302 is changed to 2mm in the present application, and the slider 4 in contact with the boss 302 is an acute angle edge, so the opening stroke is ≤2mm, which greatly reduces the opening stroke compared with the original design.

[0054] The present application improves the integrated processing of the fork rod 301 into separate processing of the left and right rods, and shortens the length of the fork rod 301. The original freely rotatable roller is improved into a fixed slider 4, eliminating the problem of inconsistent left and right relative positions of the fork 3 rollers when closing the switch in the original solution, and avoiding the situation of secondary opening and closing when opening the switch.

[0055] In some embodiments, there are two sliders 4, which are correspondingly arranged on the two side walls of the moving contact 1, and one end surface of the slider 4 adjacent to the boss 302 is an arc-shaped surface, and the arc-shaped surface is tangent to the top end surface of the slider 4, and a groove 401 is formed on the arc-shaped surface of the slider 4, and the groove 401 matches the boss 302;

[0056] The bottom end surface of the slider 4 is in contact with the upper end surface of the fork 3;

[0057] A plurality of threaded rods 402 are arranged to penetrate the slider 4 and the moving contact 1 , and ends of the threaded rods 402 are fixed by nuts 403 .

[0058] Specifically, in this embodiment, the present application changes the metal shaft into two metal rods with threads at both ends, changes the rollers on both sides into two sliders 4, and improves the original shaft fixing method using elastic retaining rings into four sets of nuts 403 with flat washers and spring washers.

[0059] The threaded rod 402 passes through the moving contact 1 and the sliders 4 on both sides to connect them together, and the two sides are then screwed and fixed with nuts 403 with flat washers and spring washers, such as Figure 4 The original shaft elastic retaining ring of the limiting roller is improved to a nut 403 for fixing the slider 4. The force value that the tightened nut 403 can bear is much greater than that of the shaft elastic retaining ring, which solves the problem that the retaining ring is easily ineffective under force and greatly enhances the stability of the system.

[0060] One side of the slider 4 is set as an arc, and a groove 401 is processed at the bottom of the arc. The adjacent surfaces of the other three planes are perpendicular to each other. The arc surface is tangent to one of the planes and has an acute angle with the other intersecting plane. The angles of the other planes are rounded, such as Figure 5 shown.

[0061] The present application improves the roller into a slider 4 and reduces the height of the boss 302 provided on the fork 3 rod, thereby shortening the movement distance during opening, accelerating the separation speed of the fork 3 and the moving contact 1, reducing the time used for opening, and improving product performance.

[0062] The shift fork 3 of the present application contacts the slider 4 from below. During the closing process, the boss 302 first contacts the arc groove 401 of the slider 4. In the process of pushing the moving contact 1 to rotate around the axis, sliding friction is generated between the boss surface and the arc surface of the slider. The boss surface is subjected to an upward force, so that the shift fork rod 301 can move closely against the slider 4 by relying on friction, eliminating the problem of the shift fork 3 in the original design tilting upward.

[0063] In some embodiments, a connection portion 101 is extended upward from the top end surface of the moving contact 1, and a stop groove is provided at the bottom end of the arc contact 5. The stop groove is correspondingly arranged on the connection portion 101, and the arc contact 5 is connected to the connection portion 101 by a fixed pin shaft 501 and a split pin 502;

[0064] A notch 102 is provided on a side wall of the top end of the moving contact 1 away from the silver point 103, and a mounting hole is provided at the notch 102. The first elastic member 8 (the first elastic member 8 described in this embodiment is a spring) is arranged above the mounting hole, and the top end of the first elastic member 8 is against the arc contact 5. The clamping bolt 7 passes through the moving contact 1 and the first elastic member 8 is arranged in the mounting hole.

[0065] Specifically, in the present embodiment, an arc contact 5 is additionally provided at the top of the moving contact 1. The arc contact 5 is fixed at the top of the moving contact 1 by a pin shaft and can swing back and forth. A spring is installed at the rear end of the arc contact to push the arc contact 5 so that the arc contact 5 always maintains a forward extended state. When closing the circuit breaker, the arc contact 5 first contacts the silver point 103 to be energized, and an arc appears on the arc contact 5 before contact. When opening the circuit breaker, the arc contact 5 is later disconnected from the silver point 103, and a high-energy arc generated by the opening of the circuit breaker is also generated on the arc contact 5, which protects the silver point 103 from being burned by the arc. When the arc contact 5 is burned, only the arc contact 5 needs to be replaced, which increases the maintainability of the equipment and greatly reduces the maintenance cost.

[0066] Based on the coordination of the above-mentioned structural parts, the linkage mechanism can effectively reduce the opening action time, improve the closing stability, eliminate the opening compound situation, improve the stability of the entire mechanism, protect the moving contact 1 silver point 103, and facilitate maintenance.

[0067] In some embodiments, Figure 7 and Fig. 9 As shown, the auxiliary contact member 10 includes an outer frame 1001, a trigger block 1002, a micro switch 1003, a trip shaft 1004 and a prompt block 1005. The outer frame 1001 is fixed in the chassis 9, and the outer frame 1001 has a built-in placement space, and the trigger block 1002 is installed in the placement space;

[0068] There are multiple micro switches 1003, which are respectively arranged on both sides of the outer frame 1001. The prompt block 1005 is rotatably arranged at one end of the outer frame 1001. A second elastic member is arranged between the end of the trigger block 1002 close to the prompt block 1005 and the outer frame 1001. The opening shaft 1004 passes through the outer frame 1001, the trigger block 1002, the second elastic member and contacts the prompt block 1005, and drives the prompt block 1005 to rotate.

[0069] Preferably, an end of the outer frame 1001 close to the opening member 11 is provided with a containing groove, and an end of the opening shaft 1004 is provided with an end head, which is correspondingly arranged in the containing groove.

[0070] Specifically, in this embodiment, firstly, the small micro switch 1003 of the auxiliary contact is replaced by a medium micro switch 1003, and is no longer welded on the printed circuit board, but fixed on the outer frame 1001 of the trigger mechanism, and is integrated with the trigger block 1002 through the outer frame 1001 as a whole, so that the position tolerance of the two is more stable and controllable, and the stability of the output of the opening and closing signals is ensured; secondly, the outer frame 1001 of the trigger mechanism is changed from sheet metal to metal machining, the sheet metal box of the triggering function is changed to the trigger block 1002 machined by non-metal, and the sheet metal box and the external bracket of the opening mechanism formed by the sheet metal process are changed to the trigger block 1002 and the outer frame 1001 formed by machining, so that the tolerance of the parts is reduced, and the matching of the various components of the structure is more stable and tight, the trigger block 1002 is a non-metal with self-lubricating properties, and the opening shaft 1004 passing through the outer frame 1001 and the trigger block 1002 can rotate freely, which ensures the smooth movement of the structure and increases the stability of the structure;

[0071] The prompt color information is changed by pushing the prompt block 1005 to rotate through the opening shaft 1004, and the scheme of interchangeable color change of the end and the rubber sheet is replaced by a rotatable prompt block 1005 scheme, which solves the problem of rubber sheets being damaged due to friction, aging, etc. after long-term use. The display area is increased through the structural setting of the prompt block 1005 itself, and the visualization of the equipment status is enhanced.

[0072] The mechanism described in this embodiment can effectively ensure the output of correct and stable auxiliary signals, effectively improve the stability of the entire mechanism, and improve visual observation and resolution accuracy, and facilitate overall structural maintenance.

[0073] In some embodiments, the number of micro switches 1003 is four groups (twelve micro switches are provided in this embodiment, each group of three), and they are symmetrically arranged on the outer walls on both sides of the outer frame 1001. A gap is also reserved on the outer frame 1001 for the roller lever action of the micro switch 1003.

[0074] Specifically, in this embodiment, the existing small micro switch 1003 is replaced by a medium-sized micro switch 1003, the trigger stroke is increased, and the machined outer frame 1001 reduces the position tolerance of the assembly, making the triggering of the micro switch 1003 more stable, and the lateral distance between the micro switches 1003 is increased. Even when the moving contact 1 is closed, the opening shaft 1004 drives the trigger block 1002 to move to the maximum position on the left, and the signal output by the micro switch 1003 will not change.

[0075] In some embodiments, a mounting bracket 1006 is disposed at one end of the outer frame 1001, and the prompt block 1005 is rotatably disposed on the mounting bracket 1006 via a rotating shaft 1007;

[0076] The mounting bracket 1006 is also provided with a limiting rod 1008 for limiting the prompt block 1005;

[0077] A through hole 901 is provided on one side plate of the chassis 9, and a prompt block 1005 is arranged corresponding to the through hole 901. The prompt block 1005 is in a fan-shaped structure, and a two-color rubber sheet is pasted on it.

[0078] Specifically, in this embodiment, the prompt block 1005 adopts a fan-shaped two-color rotating block structure. The upper half of the rotating block is green and the lower half is red. It is fixed to the mounting bracket 1006 by the rotating shaft 1007. The front end of the opening shaft 1004 contacts the lower side of the rear end face of the prompt block 1005. When the switch is opened, the prompt block 1005 is green in front, indicating the status of the equipment. When the switch is closed, the opening shaft 1004 extends to push the prompt block 1005 to rotate upward, and the green color turns red, indicating the status of the equipment. A limit rod 1008 is installed at the rear end of the prompt block 1005 to prevent the prompt block 1005 from being over-positioned.

[0079] In some embodiments, the second elastic member is a reset spring 1009 , which is sleeved on the opening gate shaft 1004 . The opening gate shaft 1004 has an inner groove in an annular shape, and a retaining spring 10010 is installed in the inner groove for limiting the reset spring 1009 .

[0080] Specifically, in this embodiment, the trigger mechanism and the micro switch 1003 of the original scheme are integrated together to increase the overall stability of the mechanism. First, the outer frame 1001 is changed from a sheet metal part to a metal block directly machined, the medium-sized micro switch 1003 is directly fixed to the outer frame 1001 by bolts and gaskets, the sheet metal box is changed to a trigger block 1002, the opening gate shaft 1004 directly passes through the through hole of the outer frame 1001 to connect the trigger block 1002 and the reset spring 1009 in series through the retaining spring 10010, the head of the opening gate shaft 1004 extends out of the front end of the left side of the outer frame 1001, passes through the mounting bracket 1006, and the head is against the side of the prompt block 1005, the opening gate shaft 1004 can rotate freely in the hole of the trigger block 1002, and the trigger block 1002 is a non-metallic material with self-lubricating properties, and is limited by the side wall of the outer frame 1001.

[0081] In some embodiments, Figure 8 and Fig. 9 As shown, the opening member 11 includes an opening base 1101, an outer sleeve 1102, an inner sleeve 1103, an opening spring 1104, an embedded part 1105, an opening rod 1106 and an opening end 1107;

[0082] The gate opening base 1101 is arranged on the frame support plate, and an arc-shaped groove 1109 is provided on one side of the gate opening base 1101. The tail of the inner sleeve 1103 is arranged as an arc-shaped protrusion 1108, and is correspondingly arranged in the arc-shaped groove 1109.

[0083] One end of the tripping rod 1106 is installed in the outer sleeve 1102 through the inner insert 1105, the tripping spring 1104 is sleeved on the tripping rod 1106, and the tripping spring 1104 is installed in the outer sleeve 1102 through the inner sleeve 1103, and the other end of the tripping rod 1106 passes through the inner sleeve 1103 and the arc groove 1109, and extends into the chassis 9, and contacts the tripping shaft 1004; it should be noted that the inner insert 1105, the tripping end 1107 and the outer sleeve 1102 are integrally injection molded, and the end of the tripping rod 1106 is threadedly connected to the inner insert 1105;

[0084] A groove 104 with an arc-shaped structure is provided at the bottom of the moving contact 1 , and an arc-shaped structure matching with the groove 104 is provided on the opening terminal 1107 .

[0085] Specifically, in this embodiment, the gate-breaking end 1107 (the gate-breaking end 1107 is made of metal) is processed into a fan surface, the gate-breaking rod 1106 is screwed into the outer sleeve 1102, and the inner sleeve 1103 is split into a gate-breaking base 1101 and an inner sleeve 1103. The gate-breaking base 1101 is fixed on the frame support plate, and an arc groove is processed on the contact surface with the inner sleeve 1103, and an elliptical through hole is processed in the middle of the arc groove. When opening and closing the gate, the gate-breaking rod 1106 can swing up and down in the elliptical hole, and an arc-shaped protrusion 1108 is processed at the tail of the inner sleeve 1103, which cooperates with the arc groove set in the gate-breaking base 1101 and can swing up and down. A circular through hole is processed, and a shaft sleeve is installed in the through hole to improve the stability of the opening rod 1106 during its movement. The opening rod 1106 passes through the middle of the shaft sleeve, and one end of the opening spring 1104 presses against the inner side of the outer sleeve 1102, and the other end presses against the inner side of the inner sleeve 1103 to provide opening repulsion force. The contact surface between the moving contact 1 and the opening end 1107 is also processed with an arc groove. When the equipment is opened and closed, the opening component 11 can swing up and down as a whole, eliminating the axial force, and the repulsion value of the opening changes smoothly and linearly, eliminating the hydraulic damping mechanism of the lower buffer, and the opening component 11 can be directly installed and disassembled, which increases the stability and maintainability of the equipment and reduces the cost of the equipment.

[0086] 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.

[0087] 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 moving contact opening and closing device, characterized in that: Including an auxiliary signal mechanism and a linkage mechanism that are in contact and connected; The linkage mechanism comprises a moving contact, a slider, a shift fork and an arc contact, wherein the moving contact is hinged to the copper bar of the DC circuit breaker and electrically connected to the copper bar, the slider is arranged on the moving contact, the shift fork is arranged on the periphery of the moving contact and is engaged with the slider, one end of the shift fork away from the slider is connected to the electromagnetic actuator, the arc contact is rotatably arranged at the top end of the moving contact, and a first elastic member is arranged between one end of the arc contact and the top end face of the moving contact; The auxiliary signal mechanism includes an auxiliary contact component and a trip component. The auxiliary contact component is arranged in the chassis, and the trip component is arranged on the frame support plate. The trip rod of the trip component is in contact with the trip shaft of the auxiliary contact component, and the trip end of the trip component is in contact and connected with the bottom of the moving contact.

2. A DC circuit breaker moving contact opening and closing device according to claim 1, characterized in that: The shift fork comprises two split shift fork rods, the two shift fork rods are located on both sides of the moving contact, and a boss is extended upward from the upper end surface of the shift fork rod.

3. A DC circuit breaker moving contact opening and closing device according to claim 2, characterized in that: There are two sliders, which are correspondingly arranged on the two side walls of the moving contact, one end face of the slider adjacent to the boss is an arc-shaped surface, and the arc-shaped surface is tangent to the top end face of the slider, and a groove is provided on the arc-shaped surface of the slider, and the groove matches the boss; The bottom end surface of the sliding block is in contact with the upper end surface of the shift fork rod.

4. A DC circuit breaker moving contact opening and closing device according to claim 1, characterized in that: The top end surface of the moving contact is provided with a connecting portion extending upward, and the bottom end of the arc contact is provided with a retaining groove, the retaining groove is correspondingly arranged on the connecting portion, and the arc contact is connected to the connecting portion by a fixed pin shaft and a split pin; A notch is provided on a side wall of the top end of the moving contact away from the silver point, a mounting hole is provided at the notch, the first elastic member is arranged above the mounting hole, the top end of the first elastic member is against the arc contact, the clamping bolt passes through the moving contact, and the first elastic member is arranged in the mounting hole.

5. A DC circuit breaker moving contact opening and closing device according to claim 1, characterized in that: The auxiliary contact member comprises an outer frame, a trigger block, a micro switch, a trip shaft and a prompt block, the outer frame is fixed in the chassis, and a placement space is built in the outer frame, and the trigger block is installed in the placement space; There are multiple micro switches, which are respectively arranged on both sides of the outer frame. The prompt block is rotatably arranged at one end of the outer frame. A second elastic member is arranged between the end of the trigger block close to the prompt block and the outer frame. The opening shaft passes through the outer frame, the trigger block, the second elastic member, contacts the prompt block, and drives the prompt block to rotate.

6. A DC circuit breaker moving contact opening and closing device according to claim 5, characterized in that: The number of the micro switches is four, and they are symmetrically arranged on the outer walls of both sides of the outer frame. A gap is also reserved on the outer frame for the roller lever of the micro switch to move.

7. A DC circuit breaker moving contact opening and closing device according to claim 5, characterized in that: A mounting bracket is provided at one end of the outer frame, and the prompt block is rotatably arranged on the mounting bracket via a rotating shaft; The mounting bracket is also provided with a limiting rod for limiting the prompt block.

8. A DC circuit breaker moving contact opening and closing device according to claim 5, characterized in that: A through hole is provided on one side plate of the chassis, and the prompt block is arranged correspondingly at the through hole. The prompt block is in a fan-shaped structure, and a two-color rubber sheet is pasted on it.

9. A DC circuit breaker moving contact opening and closing device according to claim 5, characterized in that: The second elastic member is a reset spring, which is sleeved on the opening shaft. An inner groove is annularly provided on the opening shaft, and a retaining spring is installed in the inner groove for limiting the reset spring.

10. A DC circuit breaker moving contact opening and closing device according to claim 5, characterized in that: The opening brake component comprises an opening brake base, an outer sleeve, an inner sleeve, an opening brake spring, an embedded part, an opening brake rod and an opening brake end; The gate-opening base is arranged on the frame support plate, and an arc-shaped groove is provided on one side of the gate-opening base, and the tail of the inner sleeve is arranged as an arc-shaped protrusion and is correspondingly arranged in the arc-shaped groove; One end of the opening rod is installed in the outer sleeve through an embedded part, the opening spring is sleeved on the opening rod, and the opening spring is installed in the outer sleeve through the inner sleeve, and the other end of the opening rod passes through the inner sleeve and the arc-shaped groove, and extends into the chassis, and contacts with the opening shaft; A groove in an arc-shaped structure is provided at the bottom of the moving contact, and an arc-shaped structure matching with the groove is provided on the opening end.

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