A connecting mechanism for a plug-in circuit breaker

Abstract

The present invention relates to the field of circuit breakers, and specifically to a connection mechanism of a plug-in circuit breaker, which includes a chassis housing. A handle is provided at the left input end of the chassis housing. The output end of the handle is drivingly connected to the crank of the circuit breaker body through a connecting rod. A pull-ring push rod is provided directly below the handle. The head of the output end of the pull-ring push rod is provided with a locking mechanism for locking the externally connected load wire inserted into the chassis housing. A backstop hole is provided at the middle position of the handle. A backstop groove is provided at the position of the pull-ring push rod corresponding to the backstop hole of the handle. A backstop bolt that moves up and down due to the relative lateral movement of the handle and the pull-ring push rod is provided in the backstop hole of the handle; this avoids the occurrence of electric arcs when the load wire is accidentally disconnected while the handle is in the ON state.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit breakers, and specifically to a connection mechanism for a plug-in circuit breaker. Background Art

[0002] A circuit breaker refers to a switching device that can close, carry, and interrupt the current under normal circuit conditions and can also close, carry, and interrupt the current under abnormal circuit conditions within a specified time. Circuit breakers are divided into high-voltage circuit breakers and low-voltage circuit breakers according to their application scope. The division between high and low voltages is relatively blurred. Generally, those above 3 kV are called high-voltage electrical appliances. Circuit breakers can be used to distribute electric energy, start asynchronous motors infrequently, and protect power supply lines and motors, etc. When they encounter serious overload, short circuit, undervoltage and other faults, they can automatically cut off the circuit. Its function is equivalent to the combination of a fuse switch and an over- and under-thermal relay, etc. And generally, no parts need to be changed after interrupting the fault current.

[0003] However, the circuit breakers in the prior art lack a protection structure to prevent the handle from disconnecting after the load line is connected to the circuit breaker. If the circuit breaker can freely switch ON / OFF when the load line is not connected, it is easy to generate electric arcs and pose safety problems. Preferably, there is a structure that can ensure that the circuit breaker can only switch between the ON / OFF states after the load line is connected. Summary of the Invention

[0004] The purpose of the present invention is to provide a connection mechanism for a circuit breaker to solve the problem of a connection mechanism for a plug-in circuit breaker proposed in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A connection mechanism for a plug-in circuit breaker, including a chassis housing. A handle is provided at the left input end of the chassis housing. The output end of the handle is drivingly connected to the crank of the circuit breaker body through a connecting rod. It is characterized in that: A pull-ring push rod is provided directly below the handle. The output end head of the pull-ring push rod is provided with a locking mechanism for locking the externally connected load line inserted into the chassis housing. A backstop hole is provided at the middle position of the handle. The pull-ring push rod is provided with a backstop groove corresponding to the backstop hole of the handle. A backstop bolt that moves up and down due to the relative lateral movement of the handle and the pull-ring push rod is provided in the backstop hole of the handle.

[0006] Preferably, the left and right sides of the backstop bolt move up and down along the backstop hole of the handle. The upper left side of the backstop hole of the handle is a first inclined surface that slopes to the right. The right side of the backstop groove of the pull-ring push rod is a second inclined surface that slopes to the right. The upper left part of the left side of the backstop bolt is provided with a third inclined surface corresponding to the first inclined surface of the backstop hole. The lower right part of the right side of the backstop bolt is provided with a fourth inclined surface corresponding to the second inclined surface of the backstop groove.

[0007] Preferably, the locking mechanism includes a left cam and a right cam which are symmetrically arranged on the left and right and rotatably arranged at the head of the output end of the pull-ring push rod. There is a transverse retaining wall perpendicular to the advancing direction of the pull-ring push rod in front of the pull-ring push rod. The maximum distance between the transverse retaining wall and the pull-ring push rod is the length of the left cam. There is a left V-shaped spring piece on the left side of the left cam, and a right V-shaped spring piece on the right side of the right cam. There is a left insertion channel for inserting the left load line on the left side of the left V-shaped spring piece, and a right insertion channel for inserting the right load line on the left side of the right V-shaped spring piece;

[0008] Preferably, a chassis buckle perpendicular to the moving direction of the handle is provided with an opening on the left side wall of the chassis shell. The chassis buckle includes a buckle piece and a sliding piece arranged inside the chassis shell. The width of the buckle piece is equal to the opening of the left side wall and moves in and out relative to the opening of the left side wall. The sliding piece is in a square shape with a spring arranged inside the cavity of the sliding piece. The left end of the spring abuts against the inner cavity of the sliding piece, and the right end of the spring abuts against a positioning block. The positioning block is perpendicular to the inside of the chassis shell and is arranged at the right part of the inner cavity of the sliding piece. When the handle is pushed to the on state, the left side wall of the handle abuts against the right side wall of the sliding piece;

[0009] Preferably, a left terminal is provided on the left wall of the left insertion channel, and a right terminal is provided on the right wall of the right insertion channel. The left terminal is in an L shape. The upper arm of the terminal of the left terminal is attached to the left wall of the left insertion channel, and there is a row of several left through slots arranged in parallel in the up and down direction on the right side of the upper arm of the terminal of the left terminal. The lower arm of the terminal of the left terminal is connected to the coil. The right terminal is arranged along the right wall of the right insertion channel and is connected to the load;

[0010] Preferably, the transverse retaining wall is fixedly installed inside the chassis shell. There is an arc groove at the middle position of the transverse retaining wall. The heads of the left cam and the right cam together are arranged in the arc groove. When the left cam and the right cam rotate left and right respectively, they slide along the arc edge of the arc groove. The head of the output end of the pull-ring push rod is rotatably installed with the left cam and the right cam through a pin shaft;

[0011] Preferably, the left V-shaped spring piece and the right V-shaped spring piece are symmetrically arranged and have the same structure. The V-shaped spring piece includes a left spring arm and a right spring arm. The left V-shaped spring piece is installed inside the chassis shell through a left positioning pin, and the right V-shaped spring piece is installed inside the chassis shell through a right positioning pin. A right spring arm of the left V-shaped spring piece abuts against the left cam, and a left spring arm of the left V-shaped spring piece faces the left insertion channel. The left cam is driven by the pull-ring push rod to rotate leftward. The left cam pushes the right spring arm of the left V-shaped spring piece, and the left spring arm of the left V-shaped spring piece locks the left load line inserted into the left insertion channel;

[0012] Preferably, the left V-shaped spring sheet and the right V-shaped spring sheet are symmetrically arranged and have the same structure, and the end surface of the left spring arm of the left V-shaped spring sheet is provided with a load line groove adapted to the left load line;

[0013] Preferably, an indicator baffle is provided at the upper left part of the chassis shell, the indicator baffle is rotatably installed in the chassis shell through an indicator rotating shaft, the indicator baffle comprises an upper baffle arm and a lower baffle arm, an end face of the upper baffle arm of the indicator baffle is provided with an indicating baffle surface, the chassis shell is provided with an indicating observation hole at a position corresponding to the indicating baffle surface, and the indicator baffle is driven to rotate by a handle;

[0014] Preferably, a travel groove is formed on the end surface of the lower arm of the indicator baffle, and a protrusion is provided on the left side of the handle, and the protrusion slides in the travel groove. When the handle is pushed, the protrusion acts on the right end of the travel groove, causing the indicator baffle to rotate clockwise and the indicating baffle surface to leave the indicating observation hole. When the handle is pulled out, the protrusion acts on the left end of the travel groove, causing the indicator baffle to rotate counterclockwise and the indicating baffle surface blocks the indicating observation hole.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. Through the coordinated arrangement of the stop hole, the stop bolt and the stop groove, it is ensured that the circuit breaker installed with the connection mechanism provided by the present invention will only have the following states: A. The pull ring push rod is pulled out (the load line is not connected), the handle cannot be pushed forward, and the circuit breaker can only be in the OFF state; B. The pull ring push rod is pushed forward (the load line is connected), the handle is not pushed forward, and the circuit breaker is in the OFF state; C. The pull ring push rod is pushed forward (the load line is connected), the handle is pushed forward, and the circuit breaker is in the ON state, so as to avoid the occurrence of arc due to accidental disconnection of the load line when the handle is in the ON state.

[0017] 2. A locking structure of a pull ring push rod-left cam / right cam-left V-shaped spring sheet / right V-shaped spring sheet for the load line is set. First, it ensures the fixation of the load line. Compared with the existing technology, it can provide a smoother and more stable locking action, and obtain a large locking force with a very small push-pull force.

[0018] 3. A chassis buckle is added. When the handle is pressed in, the circuit breaker is powered on, the handle chassis buckle directly supports it, and the chassis buckle cannot be pressed in. This product cannot be removed when the power is on (that is, it cannot be replaced when the power is on); when the handle is pulled out or the circuit breaker automatically pops out after taking off, the position of the handle and the chassis buckle are staggered. This chassis buckle enters the circuit breaker body under the pressure of external force and is flush with the chassis shell. This circuit breaker product can be directly pushed into the equipment, and the negative load line, positive load line and signal output terminal connector are connected to complete the power-off replacement work, ensuring fast installation and disassembly.

[0019] 4. The settings of the left terminal and the right terminal facilitate the connection with the load line. At the same time, the left through slot and the right through slot are added to increase the friction performance and prevent accidental disconnection of the wire.

[0020] 5. The setting of the middle arc groove of the transverse retaining wall makes the left cam and the right cam rotate more smoothly when rotating left and right respectively;

[0021] 6. The addition of the indicator plate baffle can remind the user of the specific situation of this product. When the handle is pushed in or out, the indicator plate baffle moves along, and the displayed situation can be directly seen through the indicator plate observation hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a sectional view of the pull ring push rod being pulled out in the handle disconnected state of the present invention;

[0023] Figure 2 It is a sectional view of the pull ring push rod being pushed in the handle connected state of the present invention;

[0024] Figure 3 It is a sectional view of the pull ring push rod being pushed in the handle disconnected state of the present invention;

[0025] Figure 4 For the present invention Figure 1 It is a view of the pull ring push rod in the pulled out state looking down and rotated 90 degrees;

[0026] Figure 5 For the present invention Figure 1 It is a view of the pull ring push rod in the pushed in state looking down and rotated 90 degrees;

[0027] Figure 6 For the present invention Figure 1 It is a view of the handle disconnected state with the chassis buckle movable looking down and rotated 90 degrees;

[0028] Figure 7 For the present invention Figure 1 It is a view of the handle disconnected state with the chassis buckle movable looking down and rotated 90 degrees;

[0029] Figure 8 For the present invention Figure 1 It is a view of the handle connected state with the chassis buckle locked looking down and rotated 90 degrees;

[0030] Figure 9 For the present invention Figure 1 It is a view of the handle connected state with the chassis buckle locked looking down and rotated 90 degrees. DETAILED DESCRIPTION OF THE INVENTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0032] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0033] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "several" means two or more, unless otherwise specifically defined.

[0034] To achieve the above object, the present invention provides the following technical solutions: Refer to Figure 1 、 Figure 2 and Figure 3 , the left - right, up - down orientation of the following - described content is distributed in the direction of Figure 1 、 Figure 2 and Figure 3 A connecting mechanism of a plug - in circuit breaker includes a chassis housing 1. A handle 2 is provided at the left - hand input end of the chassis housing 1. The output end of the handle 2 is drivingly connected to a crank 4 of a circuit - breaker body through a connecting rod 3. It is characterized in that: A pull - ring push rod 5 is provided directly below the handle 2. The head of the output end of the pull - ring push rod 5 is provided with a locking mechanism for locking an externally - connected load wire inserted into the chassis housing 1. A back - stop hole 6 is provided at the middle position of the handle 2. The pull - ring push rod 5 is provided with a back - stop groove 7 corresponding to the position of the back - stop hole 6 of the handle 2. A back - stop bolt 8 that moves up and down due to the relative lateral movement of the handle 2 and the pull - ring push rod 5 is provided in the back - stop hole 6 of the handle 2.

[0035] Preferably, Figure 1 、 Figure 2 and Figure 3 , the left - right, up - down orientation of the following - described content is distributed in the direction of Figure 1 、Figure 2 and Figure 3 In the direction distribution, the left and right edges of the anti-reverse bolt 8 move up and down the anti-reverse holes 6 of the handle 2. The upper left side of the anti-reverse hole 6 of the handle 2 is the first inclined surface 9 inclined to the right. The right side of the anti-reverse groove 7 of the pull-ring push rod 5 is the second inclined surface 10 inclined to the right. The upper left part of the anti-reverse bolt 8 is provided with a third inclined surface 11 corresponding to the first inclined surface 9 of the anti-reverse hole 6. The lower right part of the anti-reverse bolt 8 is provided with a fourth inclined surface 12 corresponding to the second inclined surface 10 of the anti-reverse groove 7. Through the cooperation setting of the anti-reverse hole 6 - anti-reverse bolt 8 - anti-reverse groove 7, it is ensured that the circuit breaker installed with the connection mechanism provided by the present invention will only have the following several states: A. The pull-ring push rod 5 is pulled out (the load line is not connected), the handle 2 cannot be pushed in, and the circuit breaker can only be in the OFF state. B. The pull-ring push rod 5 is pushed in (the load line is connected), the handle 2 is not pushed in, and the circuit breaker is in the OFF state. C. The pull-ring push rod 5 is pushed in (the load line is connected), the handle 2 is pushed in, and the circuit breaker is in the ON state, avoiding the occurrence of electric arcs when the load line is accidentally disconnected while the handle 2 is in the ON state. The actual working principle is as follows: When the pull-ring push rod 5 is pulled out, the anti-reverse bolt 8 leaves the anti-reverse groove 7 along the second inclined surface 10, and the whole anti-reverse bolt 8 enters the anti-reverse hole 6. At this time, the left side of the anti-reverse bolt 8 abuts against the first inclined surface 9 of the handle 2, so the handle 2 can only be in the OFF state. Only after the pull-ring push rod 5 is pushed in and the anti-reverse bolt 8 falls into the anti-reverse groove 7, can the handle 2 realize the ON / OFF switching. In fact, it is ensured that after the load line is connected, the handle 2 can realize the ON / OFF switching, preventing the occurrence of electric arcs when the handle 2 is in the ON state (when the circuit breaker is energized) and the load line is accidentally disconnected. For Figure 1 it, when the pull-ring push rod 5 is pulled out, the handle 2 can only be in the OFF state, Figure 2 for it, when the pull-ring push rod 5 is pushed in, the handle 2 is in the OFF state, Figure 3 for it, when the pull-ring push rod 5 is pushed in, the handle 2 is in the ON state.

[0036] Preferably, referring to Figure 4 and Figure 5 below, the left-right, up-down directions of the following content are in accordance with Figure 4 and Figure 5In the direction distribution, the locking mechanism includes a left cam 13 and a right cam 14 that are symmetrically arranged on the left and right and rotatably provided at the head of the output end of the pull-ring push rod 5. A transverse retaining wall 15 perpendicular to the advancing direction of the pull-ring push rod 5 is provided in front of the pull-ring push rod 5. The maximum distance between the transverse retaining wall 15 and the pull-ring push rod 5 is the length of the left cam 13. A left V-shaped spring 27 piece 16 is provided on the left side of the left cam 13, and a right V-shaped spring 27 piece 17 is provided on the right side of the right cam 14. A left insertion channel 19 for inserting the left load line 18 is provided on the left side of the left V-shaped spring 27 piece 16, and a right insertion channel 21 for inserting the right load line 20 is provided on the left side of the right V-shaped spring 27 piece 17. The locking structure of the pull-ring push rod 5 - left cam 13 / right cam 14 - left V-shaped spring 27 piece 16 / right V-shaped spring 27 piece 17 for the load line is set, which firstly ensures the fixation of the load line. Compared with the prior art, it can provide a more gentle and stable locking action, and obtain a large locking force with a very small pushing and pulling force.

[0037] Its actual working principle is as follows: As Figure 4 shown, at this time, the pull-ring push rod 5 has not advanced yet, so the left cam 13 and the right cam 14 have not rotated to the left and right respectively. The load lines are inserted into the left insertion channel 19 and the right insertion channel 21 respectively. Then, the pull-ring push rod 5 is pushed, and the left cam 13 and the right cam 14 rotate to the left and right respectively along the arc groove 35 of the transverse retaining wall 15, and the forces act on the left V-shaped spring 27 piece 16 and the right V-shaped spring 27 piece 17 respectively. The left V-shaped spring 27 piece 16 and the right V-shaped spring 27 piece 17 act on the load line due to the force, locking it and preventing the load line from being accidentally pulled out;

[0038] Preferably, referring to Figure 6 、 Figure 7 、 Figure 8 and Figure 9 below, the left-right, up-down orientations of the following described content are in accordance with Figure 6 、 Figure 7 、 Figure 8 and Figure 9The left side wall opening 26 of the chassis shell 1 is provided with a chassis buckle 22 which is perpendicular to the movable direction of the handle 2. The chassis buckle 22 includes a buckle 24 and a sliding member 25 arranged inside the chassis shell 1. The buckle 24 has a width equal to the left side wall opening 26 and moves in and out relative to the left side wall opening 26. The sliding member 25 is in a mouth shape. A spring 27 is provided in the inner cavity of the sliding member 25. The left end of the spring 27 abuts against the inner cavity of the sliding member 25. The right end of the spring 27 abuts against a positioning block 28. The positioning block 28 is vertical in the chassis shell 1 and is arranged on the right part of the inner cavity of the sliding member 25. When the handle 2 is pushed to the wiring state, the hand The left wall of the handle 2 and the right wall of the sliding member 25 are abutted to add a chassis buckle 22. When the handle 2 is pressed in, the circuit breaker is powered on, and the chassis buckle 22 of the handle 2 directly resists, and the chassis buckle 22 cannot be pressed in. This product cannot be removed when powered on (that is, it cannot be replaced when powered on); when the handle 2 is pulled out or the circuit breaker automatically pops out after taking off, the position of the handle 2 and the chassis buckle 22 are offset. This chassis buckle 22 enters the circuit breaker body under the pressure of external force and is flush with the chassis shell 1. This circuit breaker product can be directly pushed into the equipment, and the negative load line, the positive load line and the signal output terminal connector are connected to complete the power-off replacement work, ensuring fast installation and disassembly;

[0039] Preferably, see Figure 4 and Figure 5 The left, right, top, and bottom directions of the content described below are based on Figure 4 and Figure 5 The left wall of the left insertion channel 19 is provided with a left terminal 29, and the right wall of the right insertion channel 21 is provided with a right terminal 30. The left terminal 29 is L-shaped, and the terminal upper arm 31 of the left terminal 29 is attached to the left wall of the left insertion channel 19, and the right side of the terminal upper arm 31 of the left terminal 29 is provided with a row of left through grooves 32 arranged in parallel in the up and down directions, and the terminal lower arm 33 of the left terminal 29 is connected to the coil 34, and the right terminal 30 is arranged along the right wall of the right insertion channel 21 and connected to the load. The arrangement of the left terminal 29 and the right terminal 30 is convenient for connecting with the load line, and at the same time, the left through groove 32 and the right through groove are added to increase the friction performance and prevent accidental disconnection.

[0040] Preferably, see Figure 4 and Figure 5 The left, right, top, and bottom directions of the content described below are based on Figure 4 and Figure 5In the direction distribution, the transverse retaining wall 15 is fixedly installed in the chassis housing 1 by bolts. An arc groove 35 is provided at the middle position of the transverse retaining wall 15. The heads of the left cam 13 and the right cam 14 when brought together are arranged in the arc groove 35. When the left cam 13 and the right cam 14 rotate left and right respectively, they slide along the arc edge of the arc groove 35. The setting of the arc groove 35 in the middle of the transverse retaining wall 15 makes the actions of the left cam 13 and the right cam 14 smoother when they rotate left and right respectively. The output end head of the pull-ring push rod 5 is rotationally installed on the left cam 13 and the right cam 14 through a pin shaft 36;

[0041] For the left V-shaped spring 27 leaf 16 and the right V-shaped spring 27 leaf 17, actually, various structures can be selected. The following selects a relatively simple and convenient structure:

[0042] Embodiment 1

[0043] See Figure 4 and Figure 5 The left-right, up-down orientations of the content described below are in accordance with Figure 4 and Figure 5 In the direction distribution, the left V-shaped spring 27 leaf 16 and the right V-shaped spring 27 leaf 17 are symmetrically arranged and have the same structure. Both are V-shaped spring 27 leaves including a left spring 27 arm and a right spring 27 arm. The left V-shaped spring 27 leaf 16 is installed in the chassis housing 1 through a left positioning pin 37. The right V-shaped spring 27 leaf 17 is installed in the chassis housing 1 through a right positioning pin 38. A right spring 27 arm of the left V-shaped spring 27 leaf 16 abuts against the left cam 13. A left spring 27 arm of the left V-shaped spring 27 leaf 16 is inserted leftward into the channel 19. The left cam 13 is driven by the pull-ring push rod 5 to rotate leftward. The left cam 13 pushes the right spring 27 arm of the left V-shaped spring 27 leaf 16. The left spring 27 arm of the left V-shaped spring 27 leaf 16 locks the left load line 18 inserted into the left insertion channel 19. The left V-shaped spring 27 leaf 16 and the right V-shaped spring 27 leaf 17 are symmetrically arranged and have the same structure. The end face of the left spring 27 arm of the left V-shaped spring 27 leaf 16 is provided with a load line groove adapted to the left load line 18;

[0044] In addition to this, the present invention also adds some other additional structures. See Figure 4 and Figure 5 In the upper left part of the chassis housing 1, there is an indicator plate retaining piece 39. The indicator plate retaining piece 39 is rotationally installed in the chassis housing 1 through an indicator plate rotating shaft 40. The indicator plate retaining piece 39 includes a retaining piece upper arm 41 and a retaining piece lower arm 42. An indicator retaining surface 43 is provided on the end face of the retaining piece upper arm 41 of the indicator plate retaining piece 39. An indicator observation hole is opened in the chassis housing 1 at the position corresponding to the indicator retaining surface 43. The indicator plate retaining piece 39 is driven to rotate by the handle 2;

[0045] Preferably, referring to Figure 4 and Figure 5 , the upper, lower, left, and right orientations of the content described below are distributed according to the directions of Figure 4 and Figure 5 . A travel groove 45 is formed at the end face of the lower arm 42 of the baffle of the sign baffle 39. A convex block 46 is provided on the left side of the handle 2. The convex block 46 slides in the travel groove 45. When the handle 2 is pushed in, the convex block 46 acts on the right end of the travel groove 45, causing the sign baffle 39 to rotate clockwise and the indicating surface 43 to leave the indicating observation hole. When the handle 2 is pulled out, the convex block 46 acts on the left end of the travel groove 45, causing the sign baffle 39 to rotate counterclockwise and the indicating surface 43 to block the indicating observation hole.

[0046] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0047] 1. Through the cooperative setting of the anti-retreat hole 6 - anti-retreat bolt 8 - anti-retreat groove 7, it is ensured that the circuit breaker installed with the connection mechanism provided by the present invention can only be in the following states: A. The pull-ring push rod 5 is pulled out (the load line is not connected), the handle 2 cannot be pushed in, and the circuit breaker can only be in the OFF state; B. The pull-ring push rod 5 is pushed in (the load line is connected), the handle 2 is not pushed in, and the circuit breaker is in the OFF state; C. The pull-ring push rod 5 is pushed in (the load line is connected), the handle 2 is pushed in, and the circuit breaker is in the ON state, avoiding the occurrence of electric arcs when the load line is accidentally disconnected when the handle 2 is in the ON state.

[0048] 2. A locking structure for the load line is provided with the pull-ring push rod 5 - left cam 13 / right cam 14 - left V-shaped spring 27 leaf 16 / right V-shaped spring 27 leaf 17. First, it ensures the fixation of the load line, and compared with the prior art, it can provide a more gentle and stable locking action.

[0049] 3. The chassis buckle 22 is added. When the handle 2 is pressed in, the circuit breaker is powered on and connected. The handle 2 directly abuts against the chassis buckle 22, and the chassis buckle 22 cannot be pressed in. This product cannot be disassembled when powered on (i.e., it cannot be disassembled and replaced when powered on); when the handle 2 is pulled out or the circuit breaker pops up automatically after tripping, the positions of the handle 2 and the chassis buckle 22 are staggered. The chassis buckle 22 is pressed into the circuit breaker body under the action of an external force and is flush with the chassis housing 1. This circuit breaker product can be directly pushed into the device to connect the negative load line, positive load line, and signal output terminal connector, completing the power-off disassembly and replacement work, ensuring quick installation and disassembly.

[0050] 4. The left terminal 29 and the right terminal 30 are provided to facilitate the connection with the load line. At the same time, the left through groove 32 and the right through groove are added to increase the friction performance and prevent accidental disconnection of the wire.

[0051] 5. The provision of the middle arc groove 35 in the transverse retaining wall 15 enables the left cam 13 and the right cam 14 to rotate more smoothly when turning left and right respectively;

[0052] 6. The addition of the indicator plate flap 39 can remind the user of the specific situation of this product. When the handle 2 is pushed in or out, the indicator plate flap 39 moves along, and the displayed situation can be directly seen through the indicator plate observation hole.

Claims

1. A connection mechanism for a plug-in circuit breaker, comprising a chassis housing (1), a handle (2) is provided at the left input end of the chassis housing (1), and the output end of the handle (2) is drivingly connected to a crank (4) of a circuit breaker body through a connecting rod (3), characterized in that: A pull-ring push rod (5) is provided directly below the handle (2). A locking mechanism for locking an external load line is provided at the head of the output end of the pull-ring push rod (5). A backstop hole (6) is provided at the middle position of the handle (2). A backstop groove (7) is provided at the position of the pull-ring push rod (5) corresponding to the backstop hole (6) of the handle (2). A backstop bolt (8) that moves up and down due to the relative lateral movement of the handle (2) and the pull-ring push rod (5) is provided in the backstop hole (6) of the handle (2). The left and right sides of the backstop bolt (8) move up and down along the backstop hole (6) of the handle (2). The upper left side of the backstop hole (6) of the handle (2) is a first inclined surface (9) inclined to the right. The right side of the backstop groove (7) of the pull-ring push rod (5) is a second inclined surface (10) inclined to the right. A third inclined surface (11) corresponding to the first inclined surface (9) of the backstop hole (6) is provided on the upper left part of the left side of the backstop bolt (8). A fourth inclined surface (12) corresponding to the second inclined surface (10) of the backstop groove is provided on the lower right part of the right side of the backstop bolt (8). The locking mechanism includes a left cam (13) and a right cam (14) that are symmetrically arranged left and right and rotatably provided at the head of the output end of the pull-ring push rod (5). A transverse retaining wall (15) perpendicular to the advancing direction of the pull-ring push rod (5) is provided in front of the pull-ring push rod (5). The maximum distance between the transverse retaining wall (15) and the pull-ring push rod (5) is the length of the left cam (13). A left V-shaped spring piece (16) is provided on the left side of the left cam (13). A right V-shaped spring piece (17) is provided on the right side of the right cam (14). A left insertion channel (19) for inserting the left load line (18) is provided on the left side of the left V-shaped spring piece (16). A right insertion channel (21) for inserting the right load line (20) is provided on the right side of the right V-shaped spring piece (17). A chassis buckle (22) perpendicular to the moving direction of the handle (2) is provided at the opening (26) on the left side wall of the chassis housing (1). The chassis buckle (22) includes a buckle part (24) and a sliding part (25) provided inside the chassis housing (1). The width of the buckle part (24) is equal to that of the opening (26) on the left side wall and it moves in and out relative to the opening (26) on the left side wall. The sliding part (25) is in a square shape. A spring (27) is provided inside the cavity of the sliding part (25). The left end of the spring (27) abuts against the inner cavity of the sliding part (25). The right end of the spring (27) abuts against a positioning block (28). The positioning block (28) is perpendicular to the inside of the chassis housing (1) and is provided in the right part of the inner cavity of the sliding part (25). When the handle (2) is pushed to the on state, the left side wall of the handle (2) abuts against the right side wall of the sliding part (25).

2. The connecting mechanism of a plug-in circuit breaker according to claim 1, characterized in that: The left wall of the left insertion channel (19) is provided with a left terminal (29), and the right wall of the right insertion channel (21) is provided with a right terminal (30). The left terminal (29) is L-shaped. The upper arm (31) of the left terminal (29) is attached to the left wall of the left insertion channel (19), and a row of several left through slots (32) arranged parallel to the up-down direction is provided on the right side of the upper arm (31) of the terminal of the left terminal (29). The lower arm (33) of the terminal of the left terminal (29) is connected to the coil (34), and the right terminal (30) is arranged along the right wall of the right insertion channel (21) and is connected to the load.

3. The connecting mechanism of a plug-in circuit breaker according to claim 1, characterized in that: The transverse retaining wall (15) is fixedly installed in the chassis housing (1). An arc-shaped groove (35) is provided at the middle position of the transverse retaining wall (15). The heads of the left cam (13) and the right cam (14) that are joined together are arranged in the arc-shaped groove (35). When the left cam (13) and the right cam (14) rotate left and right respectively, they slide along the arc edge of the arc-shaped groove (35). The output end head of the pull-ring push rod (5) is rotatably installed with the left cam (13) and the right cam (14) through a pin shaft (36).

4. The connecting mechanism of a plug-in circuit breaker according to claim 1, characterized in that: The left V-shaped spring piece (16) and the right V-shaped spring piece (17) are symmetrically arranged and have the same structure. Both are V-shaped spring pieces including a left spring arm and a right spring arm. The left V-shaped spring piece (16) is installed in the chassis housing (1) through a left positioning pin (37), and the right V-shaped spring piece (17) is installed in the chassis housing (1) through a right positioning pin (38). A right spring arm of the left V-shaped spring piece (16) abuts against the left cam (13), and a left spring arm of the left V-shaped spring piece (16) faces the left insertion channel (19). The left cam (13) is driven by the pull-ring push rod (5) to rotate leftward. The left cam (13) pushes the right spring arm of the left V-shaped spring piece (16), and the left spring arm of the left V-shaped spring piece (16) locks the left load line (18) inserted into the left insertion channel (19).

5. The connecting mechanism of a plug-in circuit breaker according to claim 4, characterized in that: The end face of the left spring arm of the left V-shaped spring piece (16) is provided with a load line groove adapted to the left load line (18).

6. The connecting mechanism of a plug-in circuit breaker according to claim 1, characterized in that: An indicator plate retaining piece (39) is provided in the upper left part of the chassis housing (1). The indicator plate retaining piece (39) is rotatably installed in the chassis housing (1) through an indicator plate rotating shaft (40). The indicator plate retaining piece (39) includes an upper retaining arm (41) and a lower retaining arm (42). An indicating retaining surface (43) is provided on the end face of the upper retaining arm (41) of the indicator plate retaining piece (39). An indicating observation hole is opened in the chassis housing (1) at the position corresponding to the indicating retaining surface (43). The indicator plate retaining piece (39) is driven to rotate by the handle (2).

7. The connecting mechanism of a plug-in circuit breaker according to claim 6, characterized in that: A stroke groove (45) is formed at the end face of the lower arm (42) of the sign baffle (39). A convex block (46) is provided on the left side of the handle (2). The convex block (46) slides in the stroke groove (45). When the handle (2) is pushed in, the convex block (46) acts on the right end of the stroke groove (45), causing the sign baffle (39) to rotate clockwise, and the indicating surface (43) to move away from the indicating observation hole. When the handle (2) is pulled out, the convex block (46) acts on the left end of the stroke groove (45), causing the sign baffle (39) to rotate counterclockwise, and the indicating surface (43) to block the indicating observation hole.

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