CN214044719U - Handcart type circuit breaker - Google Patents

Abstract

A handcart type circuit breaker belongs to the technical field of medium and high voltage electrical appliances. The handcart type circuit breaker comprises a circuit breaker body and a propelling device for driving the circuit breaker body to move, wherein the propelling device comprises a mounting bracket, an operating end is fixedly arranged on the mounting bracket and comprises an operating hole and an operating hole cover plate, the handcart type circuit breaker further comprises a transmission pressing mechanism, an interlocking mechanism and a microswitch, and the interlocking mechanism comprises a mounting frame, a closing interlocking rod, a reset spring and a pressing plate; when the operating hole cover plate is not opened, the microswitch is in a closed state, the closing loop is closed, and the breaker can be electrically closed; when the operating hole cover plate is opened, the microswitch is disconnected, the closing loop is disconnected, and the breaker can not be electrically closed. The advantages are that: when the operating hole cover plate is lifted upwards, the circuit breaker can not be electrically switched on in the process of switching between the test position and the working position, and the potential safety hazard of burning secondary components caused by the fact that a switching-on electrical loop is not cut off is solved.

Description

Handcart type circuit breaker

Technical Field

The utility model belongs to the technical field of well high voltage apparatus, concretely relates to handcart-type circuit breaker.

Background

The interlocking of the high-voltage vacuum circuit breaker is generally used for meeting the five-prevention requirement of a high-voltage switch cabinet, and specifically comprises the following steps: 1) the circuit breaker is prevented from being opened and closed by mistake; 2) the isolating switch is prevented from being switched on and off under load; 3) preventing the live-engaging ground switch; 4) prevent the switch with the grounding switch from switching on the breaker; 5) prevent the wrong entering into the electrified interval.

As shown in fig. 1, a handcart type circuit breaker generally includes a circuit breaker body and a propelling device for driving the circuit breaker body to move in a trolley, where the propelling device includes a mounting bracket and a lead screw transmission mechanism (not shown) fixedly mounted on the mounting bracket. The mounting bracket on fixed be provided with the operation end, the operation end including can supply operating handle 5 male operation hole 41 and be used for shielding operation hole cover plate 42 of operation hole 41, thereby wave operating handle 5 and drive the back-and-forth movement of lead screw drive mechanism action realization handcart-type circuit breaker in the cubical switchboard. The handcart type circuit breaker further comprises a transmission pressure applying mechanism 8 driven by the operating hole cover plate 42, an interlocking mechanism 9 driven by the transmission pressure applying mechanism 8 and matched with the closing half shaft 1 to realize interlocking, and a microswitch 6 connected in series in a closing electric loop of the circuit breaker. In the process that the operation hole cover plate 42 is lifted upwards, the switching-on interlocking rod 92 is pressed downwards through the transmission pressing mechanism 8, and the switching-on interlocking half shaft 92 presses downwards to block the bent plate on the switching-on half shaft 1, so that the switching-on half shaft 1 cannot rotate, and the fact that the circuit breaker cannot be switched on manually in the process of switching the test position and the working position is guaranteed. When the operation hole cover plate 42 is completely opened, the pressing plate 94 is pressed down, so that the microswitch 6 is switched to ensure that the circuit breaker cannot be electrically switched on in the switching process of the test position and the working position. After the circuit breaker reaches the test position or the working position, the operation hole cover plate 42 is closed downwards, at the moment, the interlocking is released, and the circuit breaker can normally be switched on and off. In this technique, when the operation hole cover 42 is not completely opened, the operation handle 5 can be inserted into the operation hole 41 for operation. Although the requirement of preventing the circuit breaker from being closed by mistake can be met, the potential safety hazard of burning secondary components can be caused by the condition that the closing electric loop is not cut off.

In view of the above-mentioned prior art, there is a need for an improvement of the structure of the prior handcart type circuit breaker, and for this reason, the applicant has made an advantageous design, and the technical solutions to be described below have been made in this context.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a handcart-type circuit breaker can solve the potential safety hazard of burning loss secondary components and parts that brings when closing a floodgate electric circuit is not cut off completely.

The utility model aims to achieve the purpose that the handcart type circuit breaker comprises a circuit breaker body and a propelling device driving the circuit breaker body to move, the propulsion device comprises a mounting bracket, an operating end is fixedly arranged on the mounting bracket, the operating end comprises an operating hole for inserting the operating handle and an operating hole cover plate for shielding the operating hole, the handcart type circuit breaker also comprises a transmission pressure mechanism driven by the operating hole cover plate, an interlocking mechanism driven by the transmission pressure mechanism and matched with a closing half shaft of the circuit breaker body to realize interlocking and a microswitch connected in series in a closing electric loop of the circuit breaker, the interlocking mechanism comprises a mounting frame fixedly arranged in the circuit breaker body, a closing interlocking rod capable of moving up and down along the mounting frame, a reset spring sleeved on the closing interlocking rod for resetting and a pressing plate fixedly arranged on the closing interlocking rod; when the operating hole cover plate is not opened, the pressing plate touches and presses the action end of the microswitch, the microswitch is in a closed state at the moment, a closing loop is closed, and the breaker can be electrically closed; when the operating hole cover plate is opened, external force is not applied to the microswitch by the pressing plate any more, the microswitch is disconnected at the moment, the closing loop is disconnected, and the breaker cannot be electrically closed.

The utility model discloses a concrete embodiment, the transmission mechanism of exerting pressure include interlocking lever, first turning arm and second turning arm, the interlocking lever rotate and set up on the installing support, first turning arm fixed set up the length direction's of interlocking lever one end and be connected with the handle hole apron, second turning arm cover establish and be used for driving the interlocking device action on the interlocking lever.

The utility model discloses a wherein one of them concrete embodiment, operation hole apron be equipped with first waist type hole at the lower extreme, first crank arm be provided with first pivot in the one end of keeping away from the interlocking lever, first pivot inlay dress in first waist type hole, realize the transmission between first crank arm and the operation hole apron and connect.

In another specific embodiment of the present invention, the interlocking mechanism includes a switching-off interlocking lever cooperating with a switching-off half shaft of the circuit breaker body to realize interlocking, and the switching-off interlocking lever is fixedly disposed on the pressing plate and moves synchronously with the switching-on interlocking lever.

The utility model discloses a further concrete embodiment, in the mounting bracket still include the riser, the riser bend on upper portion and form the kickup plate, the lower part is bent and is formed down the kickup plate, the lower extreme of kickup plate bend again and form the kickup plate, combined floodgate interlocking lever and separating brake interlocking lever set up side by side in one side of riser, combined floodgate interlocking lever top-down passes in proper order after the kickup plate reaches the kickdown plate corresponding to the top of combined floodgate semi-axis, the separating brake interlocking lever passes and corresponds to the top of separating brake semi-axis after the kickdown plate.

In another specific embodiment of the present invention, the interlocking mechanism further includes a third crank arm rotatably disposed on the upper bending plate, the third crank arm is provided with a second shaft pin at an end away from the upper bending plate, the transmission pressing mechanism sets a second waist-shaped hole on the second crank arm, and the second shaft pin and the second waist-shaped hole are engaged with each other by embedding to realize transmission connection.

In another specific embodiment of the present invention, the third connecting lever is further provided with a third shaft pin in the middle, the third shaft pin corresponds to the upper portion of the closing interlocking lever, and the third connecting lever drives the third shaft pin to press down to realize the actions of the closing interlocking lever and the opening interlocking lever when rotating.

In still another specific embodiment of the present invention, the return spring is a compression spring.

The utility model discloses owing to changed micro-gap switch's mounted position, compared with the prior art, the beneficial effect who has is: the operating hole cover plate is lifted upwards, the microswitch is reset, the state is switched and a switching-on secondary circuit is cut off, the condition that the circuit breaker cannot be electrically switched on in the switching process of a test position and a working position is ensured, and the potential safety hazard of burning secondary components caused by the fact that a switching-on electrical circuit is not cut off is solved.

Drawings

Fig. 1 is a schematic diagram of an internal interlocking structure of a conventional handcart type circuit breaker.

Fig. 2 is a schematic view of an internal interlocking structure according to an embodiment of the present invention.

Fig. 3 is a schematic view of an internal interlocking structure according to another embodiment of the present invention.

Fig. 4 is a schematic view of an internal interlocking structure according to still another embodiment of the present invention.

Fig. 5 is a schematic view of the overall structure of the present invention.

In the figure: 1. a switching-on half shaft; 2. a brake-separating half shaft; 3. mounting a bracket; 4. the operation end, 41, an operation hole, 42, an operation hole cover plate, 421 and a first kidney-shaped hole; 5. an operating handle; 6. a microswitch; 7. a frame; 8. the interlocking device comprises a transmission pressing mechanism 81, an interlocking rod 82, a first crank arm 821, a first shaft pin 83, a second crank arm 831 and a second kidney-shaped hole; 9. the interlocking mechanism comprises 91 parts of a mounting frame, 911 parts of a vertical plate, 912 parts of an upper bent plate, 913 parts of a lower bent plate, 914 parts of an upper folded plate, 915 parts of a middle bent plate, 92 parts of a closing interlocking rod, 93 parts of a return spring, 931 parts of a first return spring, 932 parts of a second return spring, 933 parts of a third return spring, 94 parts of a pressing plate, 941 parts of a first pressing plate, 942, a second pressing plate, 95 parts of a switching interlocking rod, 96 parts of a third crank arm, 961 parts of a second shaft pin, 962 parts of a third shaft pin.

Detailed Description

The following detailed description of the embodiments of the present invention is provided in conjunction with the accompanying drawings, but the description of the embodiments is not intended to limit the technical solutions, and any changes made in the form of the present invention rather than the essential changes should be considered as the protection scope of the present invention.

Referring to fig. 5, in this embodiment, the handcart type circuit breaker is a floor type handcart, and includes a circuit breaker body and a propelling device for driving the circuit breaker body to move, where the circuit breaker body includes a frame 7, and an operating mechanism (not shown in the figure) is disposed inside the frame 7. The operating mechanism comprises a switching-on half shaft 1 and a switching-off half shaft 2 which are rotatably arranged inside a frame 7, wherein a hand wheel (not shown in the figure) is arranged below the frame 7, and the whole front and back movement of the handcart type circuit breaker is realized through the rotation of the hand wheel. A pole (not shown) is further disposed above the frame 7, and the pole is composed of a plurality of pole assemblies and is used for carrying current passing through the vacuum circuit breaker and realizing on-off state management of the current inside the vacuum circuit breaker. Specifically, the pole is internally provided with a vacuum arc extinguish chamber, a movable conductive piece, a static conductive piece, a flexible connection, a movable conductive block and a static conductive block. The movable extending end of the vacuum arc extinguish chamber is electrically connected with the movable conducting block through flexible connection, and the static extending end of the vacuum arc extinguish chamber is electrically connected with the static conducting block. The movable conductive block is electrically connected with the tulip contact through the movable conductive piece, and the static conductive block is electrically connected with the tulip contact through the static conductive piece and used for the vacuum circuit breaker to be connected into a power supply network.

Referring to fig. 2 in conjunction with fig. 5, the propelling device includes a mounting bracket 3 and a screw driving mechanism (not shown) fixedly mounted on the mounting bracket 3. The installing support 3 on the fixed operating end 4 that is provided with, operating end 4 including supplying operating handle 5 male operation hole 41 and being used for shielding operation hole 41 operation hole apron 42, wave operating handle 5 and can drive the action of lead screw drive mechanism to realize the back-and-forth movement of handcart-type circuit breaker in the cubical switchboard. The handcart type circuit breaker further comprises a transmission pressurizing mechanism 8 driven by the operating hole cover plate 42, an interlocking mechanism 9 driven by the transmission pressurizing mechanism 8 and matched with the closing half shaft 1 and the opening half shaft 2 of the circuit breaker body to realize interlocking, and a microswitch 6 connected in series in a closing electric loop of the circuit breaker. The interlocking mechanism 9 includes a mounting bracket 91 fixedly disposed in the circuit breaker body, a closing interlocking lever 92 capable of moving up and down along the mounting bracket 91, a return spring 93 sleeved on the closing interlocking lever 92 for resetting, and a pressing plate 94 fixedly disposed on the closing interlocking lever 92. The microswitch 6 is fixedly arranged above the pressing plate 94, when the operation hole cover plate 42 is not opened, the pressing plate 94 touches the action end of the microswitch 6, at the moment, the microswitch 6 is in a closed state, a closing loop is closed, and a breaker can be electrically closed; when the operation hole cover plate 42 is opened, the pressure plate 94 does not apply external force to the micro switch 6 any more, at this time, the micro switch 6 is disconnected, the closing loop is disconnected, and the circuit breaker cannot be electrically closed.

The transmission pressing mechanism 8 includes an interlocking lever 81, a first crank arm 82, and a second crank arm 83. The interlock lever 81 is rotatably installed on the mounting bracket 3, and the first crank arm 82 is fixedly installed at one end of the interlock lever 81 in the longitudinal direction and provided with a first axis pin 821 at one end distant from the interlock lever 81. The lower end of the operation hole cover plate 42 is provided with a first kidney-shaped hole 421, and the first axle pin 821 and the first kidney-shaped hole 421 are in embedded fit to realize transmission connection between the first crank arm 82 and the operation hole cover plate 42. The second crank arm 83 is sleeved on the interlocking rod 81 and used for driving the interlocking mechanism 9 to act.

In one embodiment of the present disclosure, as shown in fig. 2, the mounting frame 91 includes a vertical plate 911, the vertical plate 911 is bent at the upper portion to form an upper bending plate 912, the lower portion is bent to form a lower bending plate 913, the lower end of the upper bending plate 912 is bent to form an upper bending plate 914, the closing interlocking rod 92 is disposed at one side of the vertical plate 911, and the closing interlocking rod 92 sequentially passes through the upper bending plate 914 and the lower bending plate 913 from top to bottom and then extends downward to form an acting end corresponding to the upper side of the closing half shaft 1. The pressing plate 94 is fixedly arranged at the upper end of the closing interlocking rod 92, the return spring 93 is sleeved on the closing interlocking rod 92, one end of the return spring 93 abuts against the pressing plate 94, the other end of the return spring 93 abuts against the upper folding plate 914, the micro switch 6 is fixedly arranged on the upper bending plate 912 and is positioned above the pressing plate 94, and the action end of the micro switch 6 is matched with the pressing plate 94 to realize the change of the state of the micro switch 6. The microswitch 5 is a normally open type switch, specifically, when the operation hole cover plate 42 is not opened, the pressure plate 94 touches the action end of the microswitch 6, at the moment, the microswitch 6 is in a closed state, a closing loop is closed, and the breaker can be electrically closed; once the operation hole cover plate 42 is opened, the pressing plate 94 does not apply external force to the action end of the micro switch 6 any more, and at the moment, the micro switch 6 is turned off, that is, the micro switch 6 is switched from a closed state to an open state, the closing circuit is opened, and the circuit breaker cannot be electrically closed.

Generally, according to the requirement of five prevention, when the breaker is switched between a test position or a working position, the breaker can not be switched on, and the breaker needs to be switched off. The interlocking mechanism 9 further comprises an opening interlocking rod 95 which is matched with the opening half shaft 2 of the circuit breaker body to realize interlocking, the opening interlocking rod 95 is fixedly arranged on the pressing plate 94 and can synchronously move along with the closing interlocking rod 92, namely, the closing interlocking rod 95 limits the rotation of the closing half shaft 1 to enable the circuit breaker to be incapable of being closed, and the opening interlocking rod 92 drives the opening half shaft 2 to rotate to enable the circuit breaker to be opened.

In another embodiment of the present invention, as shown in fig. 3, the opening interlock rod 95 and the closing interlock rod 92 are fixedly connected, the opening interlock rod 95 is fixed to the closing interlock rod 92 by a pressing plate 94, and the pressing plate 94 is fixedly disposed at any position of the closing interlock rod 92. If the pressing plate 94 is fixed to the top end of the closing interlock rod 92, the top end of the opening interlock rod 95 may be fixed to the pressing plate 94, or the number of the pressing plates 94 may be adjusted to 2 according to actual needs. The pressing plate 94 includes a first pressing plate 941 and a second pressing plate 942, wherein the first pressing plate 941 is fixedly disposed at a top end of the closing interlocking rod 92, and the second pressing plate 942 is fixedly disposed at a middle portion of the closing interlocking rod 92, so that a top end of the opening interlocking rod 95 is fixedly disposed on the second pressing plate 942, and the same technical effect can be achieved. Of course, the positions of the opening interlocking rod 95 and the closing interlocking rod 92 can be interchanged, that is, the top end of the opening interlocking plate 95 is provided with the first pressing plate 941, the second pressing plate 942 is fixedly arranged at the middle part of the opening interlocking rod 95, and the closing interlocking rod 92 is fixedly arranged on the second pressing plate 942, so that the same technical effect can be achieved.

With continued reference to fig. 3, in particular, the opening interlock lever 95 and the closing interlock lever 92 are installed in this manner. The mounting frame 91 comprises a vertical plate 911, the vertical plate 911 is bent at the upper part to form an upper bent plate 912, the lower part is bent to form a lower bent plate 913, the lower end of the upper bent plate 912 is bent to form an upper folded plate 914, and the vertical plate 911 is also bent between the upper bent plate 912 and the lower bent plate 913 to form a middle bent plate 915. The closing interlocking rod 92 and the opening interlocking rod 95 are arranged on one side of the vertical plate 911 side by side, and the closing interlocking rod 92 sequentially penetrates through the upper folding plate 914 and the lower folding plate 913 from top to bottom and then extends downwards to form an acting end corresponding to the upper part of the closing half shaft 1. The first pressing plate 941 is fixed to the upper end of the closing interlock rod 92, and one end of the second pressing plate 942 is fixed to the middle of the closing interlock rod 92. The upper end of the opening interlocking rod 95 is fixed to the other end of the second pressing plate 942, the lower end thereof penetrates through the lower bending plate 913, and the acting end thereof extends to correspond to the upper part of the closing half shaft 1, and the opening interlocking rod 95 and the closing interlocking rod 92 can slide up and down relative to the vertical plate 911. The reset spring 93 be the pressure spring, the quantity can be one or more, reset spring 93 cover establish on at least one of separating brake interlocking lever 95 and closing interlocking lever 92, in this implementation, reset spring 93 be three in quantity, including first reset spring 931, second reset spring 932 and third reset spring 933, first reset spring 931 cover establish on closing interlocking lever 92, its upper end supports and leans on first clamp plate 941, the lower extreme supports and leans on down-folded plate 914, second reset spring 932 cover establish on separating brake interlocking lever 95, its upper end supports and leans on second clamp plate 942, the lower extreme supports and leans on down-bent plate 913, third reset spring 933 cover establish on closing interlocking lever 92, its upper end supports and leans on second clamp plate 942, the lower extreme supports and leans on down-bent plate 913. The first return spring 931, the second return spring 932 and the third return spring 933 act together, so that the opening interlocking rod 95 and the closing interlocking rod 92 move upwards to realize resetting.

In the embodiment shown in fig. 3, the different mounting positions of the micro switch 6 can be adjusted, and besides the above-mentioned mounting above the first pressing plate 941, which is electrically interlocked by the first pressing plate 941, it can also be mounted above the second pressing plate 942, which is electrically interlocked by the second pressing plate 942.

Specifically, as shown in fig. 4, the micro switch 6 is fixedly disposed on the middle bending plate 915, and corresponds to the position of the second pressing plate 942, and other structures are the same as the embodiment shown in fig. 3, and the same technical effect can be achieved, and will not be described herein again.

Further, with reference to fig. 3 and 4, the interlocking mechanism 9 further includes a third crank arm 96 rotatably disposed on the upper bending plate 912, a second shaft pin 961 is disposed at an end of the third crank arm 96 away from the upper bending plate 912, the second crank arm 83 of the transmission pressing mechanism 8 is provided with a second kidney-shaped hole 831, and the second shaft pin 961 and the second kidney-shaped hole 831 are in transmission connection through an insertion fit. The third connecting lever 96 is also provided with a third shaft pin 962 in the middle, the third shaft pin 962 corresponds to the upper side of the pressing plate 94, the third connecting lever 96 drives the third shaft pin 962 to press the pressing plate 94 downwards when rotating, the pressing plate 94 drives the opening interlocking rod 95 and the closing interlocking rod 92 to move downwards, and the opening interlocking rod and the closing interlocking rod are respectively interlocked with the opening half shaft 2 and the closing half shaft 1, so that the breaker is opened and can not be closed.

Referring to fig. 3 again, the operation hole cover plate 42 is lifted upward to expose the operation hole 41, and after the operation hole 41 is completely opened, the operation handle 5 can be inserted into the operation hole 41 to push the pushing device to push the circuit breaker body, so as to switch the circuit breaker between the test position and the working position. Specifically, once the operation hole cover plate 42 is lifted upwards, the first crank arm 82 drives the interlocking shaft 81 to move and further drives the second crank arm 83 to rotate, the second crank arm 83 drives the third shaft pin 962 of the third crank arm 96 to press down the first pressing plate 914, and further drives the opening interlocking rod 95 and the closing interlocking rod 92 to move downwards and compress the first return spring 931, the second return spring 932 and the third return spring 933, the first pressing plate 914 no longer presses the action end of the micro switch 6, the micro switch 6 is turned off, the on state is switched to the off state, the closing secondary circuit is turned off, the electrical interlocking is realized, and the circuit breaker cannot be electrically closed at the moment. When the operation hole cover plate 42 is further opened until the operation hole cover plate is completely opened, the action end of the opening interlocking rod 95 acts on the opening half shaft 2, so that the breaker is opened, and meanwhile, the action end of the closing interlocking rod 92 acts on the closing half shaft 1, so that the closing half shaft 1 cannot rotate, the breaker cannot be closed, and manual closing of the breaker in the process of switching the test position and the working position is guaranteed. After the circuit breaker reaches the test position or the working position, the operation hole cover plate 42 is pressed down to shield the operation hole 41, the first crank arm 82 drives the interlocking shaft 81 to rotate, the second crank arm 83 drives the third shaft pin 96 of the third crank arm 96 to move upwards, and the first pressing plate 914 is not pressed any more. The opening interlock lever 95 and the closing interlock lever 92 are reset by the driving of the first return spring 931, the second return spring 932 and the third return spring 933, and at this time, the interlock is released. The operation hole 41 is closed, the propulsion device cannot be operated, and the breaker can be normally switched on and switched off.

Claims (8)

1. The utility model provides a handcart-type circuit breaker, advancing device including circuit breaker body and the removal of drive circuit breaker body, advancing device include installing support (3), installing support (3) on the fixed operation end (4) that is provided with, operation end (4) including supply operating handle (5) male handle hole (41) and be used for shielding handle hole (41) operation hole apron (42), handcart-type circuit breaker still including applying pressure mechanism (8) by the transmission that handle hole apron (42) drove, apply pressure mechanism (8) by the transmission and realize interlocking (9) and concatenate micro-gap switch (6) in circuit breaker combined floodgate electric circuit with the cooperation of closing half axle (1) of circuit breaker body, interlocking (9) including fixed mounting bracket (91) that set up in circuit breaker body, can follow closing rod (92) that closing mounting bracket (91) reciprocated, Establish reset spring (93) and fixed clamp plate (94) of setting on closing interlocking lever (92) that are used for restoring to the throne on closing interlocking lever (92), its characterized in that: when the operating hole cover plate (42) is not opened, the pressing plate (94) touches and presses the action end of the microswitch (6), the microswitch (6) is in a closed state at the moment, a closing loop is closed, and the breaker can be electrically closed; when the operating hole cover plate (42) is opened, the pressing plate (94) does not apply external force to the microswitch (6), the microswitch (6) is disconnected at the moment, the closing loop is disconnected, and the breaker can not be electrically closed.

2. The handcart type circuit breaker according to claim 1, characterized in that the transmission pressure mechanism (8) comprises an interlocking rod (81), a first crank arm (82) and a second crank arm (83), the interlocking rod (81) is rotatably arranged on the mounting bracket (3), the first crank arm (82) is fixedly arranged at one end of the length direction of the interlocking rod (81) and is connected with the operation hole cover plate (42), and the second crank arm (83) is fixedly arranged on the interlocking rod (81) and is used for driving the interlocking mechanism (9) to act.

3. The handcart type circuit breaker according to claim 2, characterized in that the operation hole cover plate (42) is provided with a first kidney-shaped hole (421) at the lower end, the first crank arm (82) is provided with a first shaft pin (821) at the end far away from the interlocking rod (81), and the first shaft pin (821) is embedded in the first kidney-shaped hole (421) to realize the transmission connection between the first crank arm (82) and the operation hole cover plate (42).

4. The handcart type circuit breaker according to claim 3, characterized in that the interlocking mechanism (9) further comprises an opening interlocking rod (95) which is matched with the opening half shaft (2) of the circuit breaker body to realize interlocking, and the opening interlocking rod (95) is fixedly arranged on the pressure plate (94) and moves synchronously with the closing interlocking rod (92).

5. The handcart type circuit breaker as claimed in claim 4, wherein said mounting bracket (91) includes a vertical plate (911), said vertical plate (911) is bent at the upper portion to form an upper bending plate (912), and the lower portion is bent to form a lower bending plate (913), the lower end of said upper bending plate (912) is bent to form an upper bending plate (914), said closing interlocking rod (92) and said opening interlocking rod (95) are arranged side by side at one side of said vertical plate (911), said closing interlocking rod (92) sequentially passes through said upper bending plate (914) and said lower bending plate (913) from top to bottom and then corresponds to the top of said closing half shaft (1), said opening interlocking rod (95) passes through said lower bending plate (913) and then corresponds to the top of said opening half shaft (2).

6. The handcart type circuit breaker according to claim 4, characterized in that said interlocking mechanism (9) further comprises a third crank arm (96) rotatably disposed on the upper bent plate (912), a second axle pin (961) is disposed at one end of the third crank arm (96) far away from the upper bent plate (912), said transmission pressing mechanism (8) is provided with a second kidney-shaped hole (831) on the second crank arm (83), and said second axle pin (961) and the second kidney-shaped hole (831) are in transmission connection through embedding fit.

7. The handcart type circuit breaker as claimed in claim 6, wherein said third connecting lever (96) further has a third pin (962) in the middle, said third pin (962) corresponds to the upper side of the closing interlock lever (92), and when the third connecting lever (96) rotates, the third pin (962) is driven to press down to realize the actions of the closing interlock lever (92) and the opening interlock lever (95).

8. A handcart type circuit breaker according to claim 1, characterized in that said return spring (93) is a compression spring.

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