CN212725199U - Connecting rod transmission mechanism of high-voltage circuit breaker and high-voltage circuit breaker based on same - Google Patents

Abstract

The utility model discloses a high voltage circuit breaker's connecting rod drive mechanism reaches high voltage circuit breaker based on it belongs to mechanical equipment technical field, including separating brake unit, combined floodgate unit and five-bar linkage, five-bar linkage include the connecting lever I that connects gradually, link board I, link board II, connecting rod I and connecting rod II. The connecting rod I and the connecting rod II are fixed in the switching-on process, the five-connecting-rod transmission mechanism is equivalent to a four-connecting-rod transmission mechanism at the moment, the force transmission direction is clear, and the five-connecting-rod transmission mechanism is converted into the five-connecting-rod transmission mechanism in the switching-off process. Compared with a four-connecting-rod transmission mechanism, the five-connecting-rod transmission mechanism can effectively reduce strong vibration of the connecting rod caused by the brake-separating action, so that friction and abrasion generated between the connected shaft pin and the connecting rod or the connecting plate are reduced, and the service life of the circuit breaker transmission mechanism is greatly prolonged.

Description

Connecting rod transmission mechanism of high-voltage circuit breaker and high-voltage circuit breaker based on same

Technical Field

The utility model belongs to the technical field of mechanical equipment, a high voltage circuit breaker's connecting rod drive mechanism and based on it is related to.

Background

The circuit breaker is used as an important element of a transformer substation, the performance of the circuit breaker is important for safe and stable operation of a power grid, and the circuit breaker mainly comprises an operating mechanism, a connecting rod transmission system, an arc extinguishing mechanism and the like. The connecting rod transmission system is used for connecting the operating mechanism and the arc extinguish chamber and transmitting energy and speed, so that the connecting rod transmission system has very important influence on the opening and closing characteristics of the circuit breaker. The whole mechanical characteristics of the circuit breaker can be influenced by the circuit breaker connecting rod transmission mechanism due to the structural form, the assembly error, the abrasion of parts in the transmission process and the like of the circuit breaker connecting rod transmission mechanism.

The transmission mechanism of the circuit breaker is generally a link mechanism, in the traditional contact connecting rod structure, a contact spring is usually arranged above a connecting plate and is connected with the connecting plate through a connecting rod, the spring pressure is transmitted to a moving contact through the connecting rod, and the contact spring adopts a spiral spring. The planar linkage mechanism is mostly composed of a revolute pair and a revolute pair, and is used for transmitting force and speed. In order to provide a defined movement of the arc chute, the linkage is usually a four-bar linkage with only one degree of freedom. Considering cost and motion performance's influence factor, because size restriction between two adjacent connecting rods, can't install rolling bearing, mostly adopt the form of pivot direct connection, pivot and connecting rod hole are mostly close-fitting and guarantee the motion precision of mechanism. However, during the cyclic action of the mechanism, the pin and the hole wall of the connecting rod are in continuous contact friction. Compare in the combined floodgate process, the impact and the vibration that the breaker separating brake process caused the mechanism need be violent many, can lead to the fit clearance of pivot and connecting rod to be bigger and bigger, and the friction that the vibration caused also can constantly generate heat, has aggravated the wearing and tearing in the motion process, seriously influences the transmission precision of mechanism's active lever and body explosion chamber, can cause power and the unable transmission of speed and produce and refuse to move even when serious.

In view of the above, it is desirable to develop a new link mechanism for a high voltage circuit breaker to solve the above problems.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the utility model aims to provide a high-voltage circuit breaker's link drive mechanism and high-voltage circuit breaker based on the link drive mechanism to solve the technical problem that the current circuit breaker link drive mechanism influences the transmission precision of mechanism driving rod and body explosion chamber because of the violent vibrations of separating brake action.

In order to achieve the above purpose, the utility model adopts the following technical scheme to realize:

a connecting rod transmission mechanism of a high-voltage circuit breaker comprises a switching-off unit, a switching-on unit and a five-connecting-rod structure, wherein the switching-off unit comprises a switching-off tripping plate and a switching-off half shaft connected to one side of the switching-off tripping plate; the switching-on unit comprises a switching-on half shaft and a switching-on tripping plate connected to the switching-on half shaft; five link structure are including the connecting lever I that connects gradually, even board I, even board II, connecting rod I and connecting rod II, connecting lever I fixes on the circuit breaker main shaft, and connecting rod II's one end is fixed on external circuit breaker link plate, and connecting rod I's one end is connected on the separating brake dropout board, and even board I is connected with cam structure with even board II's junction, and the structural gear structure that is connected with of cam has the motor.

Preferably, the cam structure comprises a cam and a cam shaft, and the cam is fixed on the external circuit breaker hanging plate through the cam shaft.

Further preferably, the gear structure comprises a main gear and a driven gear connected to the cam shaft, the main gear is connected to an external motor, the motor drives the main gear to rotate, and the main gear drives the driven gear to rotate, so as to drive the cam shaft to drive the cam to rotate.

Preferably, a roller is sleeved at the joint of the connecting plate I and the connecting plate II, and the roller is in contact with the cam in the opening state of the circuit breaker.

Preferably, the brake separating and releasing plate is a sector plate; the closing tripping plate is an L-shaped plate.

Preferably, a tension spring connected with the opening tripping plate is mounted on the side wall of the connecting rod II.

Preferably, the connecting rod transmission mechanism further comprises a spring hanging crank arm connected to the main shaft, one end of the spring hanging crank arm is connected to the cam shaft, and the other end of the spring hanging crank arm is connected to a closing spring.

Preferably, the two hanging spring crank arms and the two closing springs are arranged.

The utility model also discloses a high voltage circuit breaker who contains above-mentioned connecting rod drive mechanism, the both ends of main shaft even have two turning arms II, and two turning arms II are connected to outer turning arm through the pressure spring respectively, and the one end of outer turning arm is connected on the pressure spring, and the other end is connected with insulating pull rod through the pivot.

Preferably, the position, which is far away from one end 2/3 of the insulating pull rod, on the side wall of the outer crank arm is fixed through a shaft pin; one end of the insulating pull rod is connected with a moving contact in the vacuum arc-extinguishing chamber.

Compared with the prior art, the utility model discloses following beneficial effect has:

the utility model discloses a high voltage circuit breaker's connecting rod drive mechanism, turning arm I, even board II, connecting rod I and connecting rod II constitute the drive mechanism of a five-bar linkage jointly. In the switching-on process of the circuit breaker, the switching-off half shaft is fixed, and the switching-off tripping plate is connected to the switching-off half shaft, so that the switching-off tripping plate cannot rotate anticlockwise under the limiting action of the switching-off half shaft, and the connecting rod I connected with the switching-off tripping plate is fixed, and the connecting rod I is connected to one side of the connecting rod II, and the other side of the connecting rod II is fixed, so that the connecting rod II is also fixed all the time in the switching-on process, and the transmission mechanism of the five connecting rods is equivalent to a four-connecting-rod transmission mechanism at the moment, and has a definite force transmission. In the switching-on process, the switching-on half shaft is located the side of the cam structure, and a switching-on tripping plate is fixedly connected to one side of the switching-on half shaft, so that the switching-on half shaft can only rotate clockwise, the cam structure is driven to rotate, the cam structure transmits force to the equivalent four-link transmission mechanism, and the four-link mechanism moves to complete the switching-on process. In the brake-off process of the circuit breaker, the brake-off half shaft is controlled to rotate, so that the brake-off tripping plate connected to the brake-off half shaft is acted by force to rotate, the connecting rod I also rotates along with the rotation of the brake-off tripping plate, the end, connected with the connecting rod I, of the connecting rod II also rotates along with the rotation of the connecting rod I, and the connecting rod mechanism is converted into a five-connecting-rod transmission mechanism in the brake-off process. Because there is not definite motion relation between the connecting arm I serving as the driving arm and the connecting plate I and the connecting plate II serving as the driven arm in the five-connecting-rod transmission mechanism, the force transmitted by the five-connecting-rod transmission mechanism is instantly removed, and the main shaft is driven by the opening spring to rotate anticlockwise to complete the rapid opening action of the circuit breaker. Compared with a four-connecting-rod transmission mechanism, the five-connecting-rod transmission mechanism can effectively reduce strong vibration of the connecting rod caused by the brake-separating action, so that friction and abrasion generated between the shaft pin and the connecting rod or the connecting plate are reduced, and the service life of the circuit breaker transmission mechanism is greatly prolonged. The utility model discloses the device can effectively reduce the violent vibration that the separating brake action brought to improve the transmission precision of mechanism's active lever and body explosion chamber, prolong link mechanism's life.

Furthermore, a tension spring is connected to the separating brake tripping plate and has a reset function, and when the stored energy of the closing switch is converted into the stored energy of the separating brake and the non-stored energy of the separating brake is converted into the stored energy of the separating brake, the separating brake tripping plate can return to the initial position.

Further, the pressure spring chooses for use dish spring connecting rod structure, compares in coil spring, and dish spring structure can effectively reduce the overtravel as the overtravel spring under the prerequisite of guaranteeing the same contact pressure, and simultaneously, dish spring connecting rod structure has also acted as the effect of connecting rod, transmits power and motion for outer turning arm, and then promotes insulating pull rod and drives the moving contact and accomplish the action of closing a floodgate.

The utility model also discloses a high voltage circuit breaker, high voltage circuit breaker contains above-mentioned connecting rod drive mechanism, and in this high voltage circuit breaker, the about 2/3 position departments of outer turning arm are fixed completely by the pivot, as lever principle's fulcrum. One end of the insulating pull rod is connected with the outer crank arm through a shaft pin, and the other end of the insulating pull rod is connected with a moving contact in the vacuum arc-extinguishing chamber. The pressure spring, the outer crank arm and the insulating pull rod jointly form a labor-saving lever, the principle of the lever is shown in figure 7, the vertical distance from the fulcrum to the pressure spring is a power arm, and the vertical distance from the fulcrum to the insulating pull rod is a resistance arm. Because the arm length of the power arm is twice of that of the resistance arm, according to the lever principle that the two moments (the product of force and force arm) acting on the lever must be equal in size, the circuit breaker can more quickly complete the switching-on action under the condition that the compressed spring transmits the same driving force during switching-on; under the condition that the same driving force is transmitted by the insulating pull rod during brake opening, the force transmitted to the pressure spring and the connecting rod mechanism through the outer crank arm is smaller, the mechanical vibration during brake opening of the transmission mechanism can be reduced, and the service life of the transmission mechanism can be prolonged.

Drawings

Fig. 1-1 is a side view of the device assembly structure of the high-voltage circuit breaker of the present invention;

fig. 1-2 are front views of the device assembly structure of the high-voltage circuit breaker of the present invention;

fig. 2 is a schematic diagram of the state of the link transmission mechanism before closing the high-voltage circuit breaker of the present invention;

fig. 3 is a schematic diagram of the state of the link transmission mechanism after the high-voltage circuit breaker completes switching on;

fig. 4 is a schematic diagram of the state of the connecting rod transmission mechanism after the high-voltage circuit breaker completes opening;

fig. 5 is a rear view of the link transmission mechanism in the high-voltage circuit breaker opening state of the present invention;

fig. 6 is a schematic diagram of the direction of movement of the connecting rod of the high-voltage circuit breaker of the present invention from the state of switching off the switch and the state of switching on the switch without storing energy;

fig. 7 is a schematic diagram of the direction of movement of the connecting rod of the high-voltage circuit breaker of the present invention from the state of no energy stored in the closing state to the state of no energy stored in the opening state;

fig. 8 is the utility model discloses a laborsaving lever schematic diagram that high voltage circuit breaker pressure spring, outer turning arm and insulating pull rod constitute.

Wherein: 1-an insulating shield; 2-a plum blossom plug; 3-upper contact arm; 4-upper gasket; 5-M6 bolt; 6-M12 bolt; 7-a vacuum arc-extinguishing chamber; 8-a conductive clip; 9-flexible connection; 10-lower contact arm; 11-a bolt; 12-an insulator; 13-an insulating pull rod; 14-outer crank arm; 15-chassis vehicle; 16-an insulating cover; 17-a main shaft limit bolt; 18-a spring operating mechanism; 19-a frame; 20-a cam; 21-hanging spring crank arm; 22-a switching-on half shaft; 23-closing tripping plate; 24-a camshaft; 25-crank arm I; 26-a pressure spring; 27-connecting plate I; 28-limiting plate; 29-Link plate II; 30-a brake-separating spring; 31-a driven gear; 32-connecting rod I; 33-main gear; 34-connecting rod II; 35-a closing spring; 36-a tension spring; 37-brake separating and releasing plate; 38-opening half shaft; 39-crank arm II; 40-crank arm III; 41-hanging plates; 42-a main shaft; 43-crank arm IV; 44-oil buffer; 45-a positioning member; 46-fulcrum.

Detailed Description

In order to make the technical solution of the present invention better understood, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

The present invention will be described in further detail with reference to the accompanying drawings:

example 1

As shown in fig. 2 to 5, the present embodiment provides a high voltage circuit breaker link transmission mechanism, including: link I27 and link II29, link I32 and link II34, crank arm I25, compression spring 26 and outer crank arm 14.

The connecting plate I27 and the connecting plate II29 are connected through a shaft pin, and the other end of the connecting plate 27 is connected with the crank arm I25. The connecting rod I32 and the connecting rod II34 are connected through a shaft pin. The other end of the connecting rod I32 is connected with the brake separating trip plate 37 through a shaft pin, the other end of the connecting rod II34 is completely fixed through the shaft pin, and one end of the tension spring 36 is hung at the center of the connecting rod II 34.

Example 2

The crank arm unit has eight same crank arm components, and the larger end of the circumference of the crank arm unit is fixed on the main shaft and can drive the main shaft to rotate to complete the opening and closing action of the circuit breaker. One end of the crank arm I25 is connected with the connecting plate 27 through a shaft pin to form a connecting rod transmission mechanism. One end of the crank arm IV 43 is connected with the oil buffer 44, and the other end of the crank arm III 40 is respectively hung with four brake separating springs 30 to assist in completing the energy storage and release processes of the brake separating springs 30: during closing, the connecting lever III 40 rotates clockwise, the opening spring stores energy, during opening, the connecting lever III 40 rotates anticlockwise, and the opening spring releases energy; in the high-voltage circuit breaker, as shown in fig. 1-1 and 1-2, a compression spring 26 is hung on the other end of a crank arm II 39, and the crank arm II 39 and a crank arm iii 40 are always coaxial. The other end of the pressure spring 26 is directly connected with the outer crank arm 14 to drive the outer crank arm 14, and the pressure spring 26 adopts a disc spring connecting rod structure. The rest is the same as in example 1.

Example 3

The other end of the outer crank arm 14 is connected with the insulating pull rod 13 through a shaft pin to drive the insulating pull rod 13 to move. The outer crank arm 14 is completely fixed by a pivot pin at a position about 1/3 away from the insulated pull rod 13 as a fulcrum 46 of the lever principle, as shown in fig. 8. The rest is the same as in example 1.

The utility model discloses the working process of device:

in the closing process of the high-voltage circuit breaker, as shown in fig. 2 and 3, when the high-voltage circuit breaker is in an open state and has stored energy, the positioning member 45 fixed to the cam 20 is fastened to the closing half shaft 22, and the link transmission mechanism completes the preparation of closing. Once receiving a closing signal, the closing half shaft 22 rotates by an angle to release energy storage maintenance, the cam 20 is driven by the closing spring 35 to rotate clockwise, the roller at the joint of the connecting plate I27 and the connecting plate II29 is pushed to move leftwards and downwards, meanwhile, the connecting rod I32 pushes the opening tripping plate 37 to rotate anticlockwise, the opening tripping plate 37 is buckled with the opening half shaft 38, the opening tripping plate 37 cannot rotate anticlockwise due to the limiting effect of the opening half shaft 38, and therefore the connecting rod I32 is fixed in the closing process. Because the connecting rod I32 is connected to one side of the connecting rod II34, and the other side of the connecting rod II34 is fixed by the shaft pin all the time, the connecting rod II34 is also fixed in the closing process all the time, at the moment, the five-connecting-rod transmission mechanism is equivalent to a four-connecting-rod transmission mechanism, the transmission direction of force is clear, the main shaft is driven to rotate clockwise by the connecting lever I25, and meanwhile, four brake-separating 30 springs hung on the other four connecting levers III 40 start to store energy. The moving direction of the connecting rod transmission mechanism converted from the switching-off stored energy state to the switching-on non-stored energy state is shown by reference to figures 6-1 and 6-2. The main shaft drives a connecting lever II 39 connected with a pressure spring 26 to rotate clockwise, a disc spring connecting rod mechanism serving as the pressure spring 26 is pushed to move leftwards, at the moment, the outer connecting lever 14 is equivalent to a lever, and the insulating pull rod 13 is pushed to move rightwards to drive a moving contact in the vacuum arc extinguish chamber 7 to complete closing. When the cam 20 rotates to the equal round surface, the closing operation is completed, and the state is changed to the closing non-energy storage state, and the state of the link transmission mechanism is shown in fig. 3. The motion state of the connecting rod in the closing process is shown in fig. 6.

Reclosing operation: after the mechanism completes the closing action, the cam link mechanism is in the state of closing without storing energy, and at the moment, the link transmission mechanism performs energy storage operation, and because the cam 20 and the roller are contacted on the equal circular surface, the main shaft is kept still in the whole energy storage process, and the closing of the circuit breaker is not influenced. After the energy storage is finished, the connecting rod transmission mechanism is in a closed energy storage state, and if a switching-off signal is received and switching-off action is finished, only the switching-on signal is received, and one-time automatic reclosing operation can be realized.

The brake opening process: referring to fig. 4 and 5, when an opening signal is received, the opening half shaft 38 rotates anticlockwise under the action of a tripping force, the restriction of the opening half shaft on the opening tripping plate 37 is released, the opening tripping plate 37 rotates anticlockwise under the action of the force, the connecting rod I32 is not fixed any more, so that one end of the connecting rod II34 is not fixedly limited any more, and the connecting rod II is converted into a five-connecting-rod transmission mechanism in the opening process. Because there is not definite motion relation between the connecting lever I25 serving as the driving arm and the connecting plate I27 serving as the driven arm and the connecting plate II29 of the five-connecting-rod transmission mechanism, the force transmitted by the five-connecting-rod transmission mechanism is instantly discharged, the energy is discharged by the opening spring 30, and the main shaft is driven by the four connecting levers 40 to rotate anticlockwise to complete the rapid opening action of the circuit breaker. The moving direction of the connecting rod transmission mechanism converted from the closing non-energy-storage state to the opening non-energy-storage state refers to fig. 7.

If an opening signal is received in the closing process, the buckling connection of the opening half shaft 38 is also released, at this time, the opening tripping plate 37 is not restrained any more, the four-bar linkage mechanism is changed into the five-bar linkage mechanism, and the driven arm is not influenced by the cam any more although the cam still rotates because the driving arm and the driven arm of the five-bar linkage mechanism have no determined motion characteristic, so that the circuit breaker cannot be closed to realize free tripping.

The opening tripping plate 37 is connected with a tension spring 36 which plays a role of resetting, the tension spring 36 plays a role of resetting the initial position of the opening tripping plate 37 when the closing stored energy is converted into the opening stored energy state, and when the opening stored energy is not converted into the opening stored energy state.

In this embodiment, the energy storage process after the high-voltage circuit breaker is opened: the motor drives the driven gear 31 to rotate through the main gear 33, the driven gear 31 drives the cam shaft 24 to rotate in the clockwise direction, the hanging spring crank arm 21 is connected with the cam shaft 24, the cam shaft 24 rotates to drive the hanging spring crank arm 21 to rotate in the clockwise direction, the closing spring 35 is lengthened, when the cam 20 touches the opening retaining unit and cannot continue to rotate in the clockwise direction, energy storage is finished, and the energy storage state of the spring is maintained.

In the above embodiment, the pressure spring 26 is a disc spring connecting rod structure, and includes a plurality of disc spring sleeves, and each disc spring sleeve is internally provided with a plurality of identical disc springs.

Traditional contact pressure spring adopts coil spring, can bring the slightly big problem of overrun, the utility model discloses an among the high voltage circuit breaker, pressure spring 26 adopts the structure of dish spring connecting rod. The disc springs of the disc spring connecting rod structure are arranged in the disc spring sleeves, in order to enable the circuit breaker to have a certain over travel, a plurality of disc springs with the same specification are arranged in each disc spring sleeve and are fastened by nuts and then are riveted, and the thickness of each adjusting gasket can adjust the disc spring force under the rated over travel so as to ensure the contact pressure during closing. Compared with a spiral spring, the disc spring structure as an over travel spring can effectively reduce the over travel on the premise of ensuring the same contact pressure; on the other hand, the disc spring connecting rod structure also serves as a connecting rod to transmit force and motion to the outer crank arm, and then the insulating pull rod 13 is pushed to drive the moving contact to complete the switching-on action.

The tripping plate 37 used in the above embodiment is a sector tripping plate, and the closing tripping plate 23 is an L-shaped plate. To sum up, the utility model discloses the device compares in the drive mechanism of four-bar linkage, and the drive mechanism of five-bar linkage can effectively reduce the strong vibrations that the separating brake action brought to the connecting rod to reduce friction and the wearing and tearing that produce between pivot and connecting rod or link plate, promoted circuit breaker drive mechanism's life-span by a wide margin.

The above contents are only for explaining the technical idea of the present invention, and the protection scope of the present invention cannot be limited thereby, and any modification made on the basis of the technical solution according to the technical idea of the present invention all fall within the protection scope of the claims of the present invention.

Claims (10)

1. A connecting rod transmission mechanism of a high-voltage circuit breaker is characterized by comprising a switching-off unit, a switching-on unit and a five-connecting-rod structure, wherein the switching-off unit comprises a switching-off tripping plate (37) and a switching-off half shaft (38) connected to one side of the switching-off tripping plate (37); the switching-on unit comprises a switching-on half shaft (22) and a switching-on tripping plate (23) connected to the switching-on half shaft (22); five link structure are including connecting lever I (25) that connect gradually, even board I (27), even board II (29), connecting rod I (32) and connecting rod II (34), connecting lever I (25) are fixed on circuit breaker main shaft (42), and the one end of connecting rod II (34) is fixed on external circuit breaker link plate (41), and the one end of connecting rod I (32) is connected on separating brake dropout board (37), and even board I (27) are connected with the cam structure with the junction of even board II (29), and the cam is connected with gear structure structurally, and gear structure links to each other with external motor.

2. The link transmission mechanism of a high voltage circuit breaker according to claim 1, wherein the cam structure comprises a cam (20) and a cam shaft (24), the cam (20) is fixed on an external circuit breaker hanging plate (41) through the cam shaft (24).

3. The link transmission mechanism of a high voltage circuit breaker according to claim 2, wherein the gear structure comprises a master gear (33) and a slave gear (31) connected to the cam shaft (24), the master gear (33) is connected to an external motor, the motor drives the master gear (33) to rotate, the master gear (33) drives the slave gear (31) to rotate, thereby driving the cam shaft (24) to drive the cam (20) to rotate.

4. The link transmission mechanism of a high-voltage circuit breaker according to claim 2, wherein a roller is sleeved at the joint of the link plate I (27) and the link plate II (29), and the roller is in contact with the cam (20) in the opening state of the circuit breaker.

5. The linkage drive of a high-voltage circuit breaker according to claim 1, characterized in that the opening trip plate (37) is a sector plate; the closing tripping plate (23) is an L-shaped plate.

6. The linkage transmission mechanism of a high-voltage circuit breaker according to claim 1, characterized in that the sidewall of the linkage II (34) is provided with a tension spring (36) connected with a tripping plate (37).

7. The link gear of a high voltage circuit breaker according to claim 1, further comprising a spring-engaging crank arm (21) connected to the main shaft, wherein one end of the spring-engaging crank arm (21) is connected to the cam shaft (24), and the other end is connected to a closing spring (35).

8. The link transmission mechanism of a high voltage circuit breaker according to claim 7, wherein there are two of the hanging spring crank arm (21) and the closing spring (35).

9. A high-voltage circuit breaker comprising the connecting rod transmission mechanism as claimed in any one of claims 1 to 8, wherein two connecting levers II (39) are connected to two ends of the main shaft (42), the two connecting levers II (39) are respectively connected to the outer connecting lever (14) through compression springs (26), one end of the outer connecting lever (14) is connected to the compression springs (26), and the other end of the outer connecting lever is connected to the insulating pull rod (13) through a shaft pin.

10. The high voltage circuit breaker according to claim 9, wherein the outer crank arm (14) is fixed by a pin at a position 2/3 away from one end of the insulating pull rod (13) on the side wall; one end of the insulating pull rod (13) is connected with a moving contact in the vacuum arc-extinguishing chamber (7).

Images