阅读说明：本技术 一种级联递进式电磁斥力机构及使用该机构的断路器 (Cascade progressive electromagnetic repulsion mechanism and circuit breaker using same ) 是由 张利欣 金玉琪 徐华 谭盛武 段晓辉 孙珂珂 魏建巍 杨勇 熊萍萍 孙英杰 钱平 于 2021-06-17 设计创作，主要内容包括：本发明提供了一种级联递进式电磁斥力机构及使用该机构的断路器,级联递进式电磁斥力机构包括：多个电磁斥力单元,电磁斥力单元包括：传动杆；金属盘；合闸斥力线圈；各单元沿前后方向依次布置,最前端传动杆与灭弧室动端连接,相邻传动杆之间不连接；合闸时,最前端合闸斥力线圈先通电,后方合闸斥力线圈按照设定时间间隔依次通电,使前方传动杆先移动,后方传动杆后移动并撞击前方传动杆。本发明采用多个电磁斥力单元沿合闸方向依次布置,且按照设定时间间隔依次触发斥力单元动作,距离灭弧室动端最近的单元先触发,其余单元根据距离灭弧室动端的距离由近至远依次触发,保证灭弧室动端在运动加速过程中,持续受力,提高了机构的行程和合闸速度。(The invention provides a cascade progressive electromagnetic repulsion mechanism and a circuit breaker using the same, wherein the cascade progressive electromagnetic repulsion mechanism comprises: a plurality of electromagnetic repulsion units, the electromagnetic repulsion unit comprising: a transmission rod; a metal disc; closing repulsion coil; all the units are sequentially arranged along the front-back direction, the transmission rod at the foremost end is connected with the movable end of the arc extinguish chamber, and the adjacent transmission rods are not connected; when the switch is switched on, the switch-on repulsion coil at the forefront end is electrified firstly, and the switch-on repulsion coil at the rear end is electrified in sequence according to a set time interval, so that the front transmission rod moves firstly, and the rear transmission rod moves later and impacts the front transmission rod. According to the invention, a plurality of electromagnetic repulsion units are sequentially arranged along the closing direction, and the repulsion units are sequentially triggered to act according to a set time interval, the unit closest to the movable end of the arc extinguish chamber is triggered first, and the other units are sequentially triggered from near to far according to the distance from the movable end of the arc extinguish chamber, so that the movable end of the arc extinguish chamber is ensured to be continuously stressed in the motion acceleration process, and the stroke and closing speed of the mechanism are improved.)

1. A cascade progressive electromagnetic repulsion mechanism, comprising:

at least two electromagnetic repulsion units, electromagnetic repulsion unit includes:

a transmission rod;

the metal disc is fixedly connected with the transmission rod;

the closing repulsion coil is arranged on one side of the metal disc and is used for generating electromagnetic repulsion to the metal disc after being electrified so as to drive the transmission rod to move towards the closing direction;

the electromagnetic repulsion units are sequentially arranged along the front-rear direction, a transmission rod of the electromagnetic repulsion unit at the foremost end is used for being in transmission connection with the movable end of the arc extinguish chamber, and the transmission rods of two adjacent electromagnetic repulsion units are not connected;

when the electromagnetic repulsion unit is switched on, the switching-on repulsion coil of the electromagnetic repulsion unit at the forefront is firstly electrified, and the switching-on repulsion coil of the electromagnetic repulsion unit at the rear is sequentially electrified according to a set time interval, so that the transmission rod at the front moves firstly, the transmission rod at the rear moves backwards and impacts the transmission rod at the front, and the transmission rod at the front is continuously accelerated to move under stress.

2. The cascade progressive electromagnetic repulsion mechanism according to claim 1, characterized in that the electromagnetic repulsion unit further comprises a discharge circuit connected with the closing repulsion coil, and the discharge circuit is connected with a pre-charging capacitor and a trigger switch.

3. The cascade progressive electromagnetic repulsion mechanism according to claim 1 or 2, characterized in that the collision-resistant structure is arranged at the contact collision position of two adjacent transmission rods.

4. The utility model provides a circuit breaker, includes an explosion chamber, and the explosion chamber moves the end including the explosion chamber, its characterized in that, and circuit breaker still includes cascade progressive electromagnetic repulsion mechanism, and cascade progressive electromagnetic repulsion mechanism includes:

at least two electromagnetic repulsion units, electromagnetic repulsion unit includes:

a transmission rod;

the metal disc is fixedly connected with the transmission rod;

the closing repulsion coil is arranged on one side of the metal disc and is used for generating electromagnetic repulsion to the metal disc after being electrified so as to drive the transmission rod to move towards the closing direction;

the electromagnetic repulsion units are sequentially arranged along the front-rear direction, a transmission rod of the electromagnetic repulsion unit at the foremost end is in transmission connection with the movable end of the arc extinguish chamber, and the transmission rods of two adjacent electromagnetic repulsion units are not connected;

when the electromagnetic repulsion unit is switched on, the switching-on repulsion coil of the electromagnetic repulsion unit at the forefront is firstly electrified, and the switching-on repulsion coil of the electromagnetic repulsion unit at the rear is sequentially electrified according to a set time interval, so that the transmission rod at the front moves firstly, the transmission rod at the rear moves backwards and impacts the transmission rod at the front, and the transmission rod at the front is continuously accelerated to move under stress.

5. The circuit breaker according to claim 4, wherein the electromagnetic repulsion unit further comprises a discharge circuit connected with the closing repulsion coil, and a pre-charge capacitor and a trigger switch are connected to the discharge circuit.

6. The circuit breaker according to claim 4 or 5, characterized in that the contact impact positions of two adjacent transmission rods are provided with an impact-resistant structure.

Technical Field

The invention relates to the technical field of high-voltage switch equipment, in particular to a cascade progressive electromagnetic repulsion mechanism and a circuit breaker using the same.

Background

In the current high-voltage flexible direct-current transmission project, a large number of devices such as a high-voltage direct-current circuit breaker, a high-voltage direct-current controllable lightning arrester, a high-voltage superconducting current limiter and the like are applied, the devices all provide requirements for rapid opening and closing (opening and closing speed is less than 5 ms) for switching equipment, and in order to achieve rapid opening and closing operation, an electromagnetic repulsion mechanism is basically used as an operating mechanism of a rapid switch. The basic principle of the electromagnetic repulsion mechanism is as follows: the pre-charged capacitor discharges to the driving coil, pulse current is generated in the coil, the pulse current enables an alternating magnetic field to be generated around the coil, reverse induced eddy current is generated on the metal disc, the magnetic field generated by the eddy current and the magnetic field generated by the coil interact to generate electromagnetic force, the driving rod and the arc extinguish chamber contact are driven to move, and the opening and closing operation of the switch is achieved.

Although the electromagnetic repulsion mechanism has the advantages of being fast in starting and high in opening and closing speed, due to the fact that the duration time of pulse current for generating the electromagnetic repulsion is short and generally ranges from hundreds of microseconds to thousands of microseconds (which is determined by the inductance value of a discharge coil, the capacitance value of a pre-charging capacitor and the energy storage capacity of the pre-charging capacitor), the existing time of the electromagnetic repulsion is short, continuous operation force cannot be provided, the electromagnetic repulsion is generated only at the starting moment of the mechanism, the subsequent movement of the mechanism is completed by means of inertia, the movement stroke of the electromagnetic repulsion mechanism is short and generally ranges from tens of millimeters, and therefore the stroke of the mechanism using the principle cannot be too large.

However, the fracture intervals of the existing high-voltage sulfur hexafluoride arc extinguish chambers are relatively long, for example, the fracture intervals of the 252kV sulfur hexafluoride arc extinguish chambers are generally more than 200mm, if the existing electromagnetic repulsion mechanism is to be applied to the high-voltage field, multiple fractures are required to be connected in series, and the application of the electromagnetic repulsion mechanism in the high-voltage field is realized by adopting a plurality of short-stroke arc extinguish chambers. For example, the fast high-voltage switch disclosed in chinese patent application with application publication No. CN105470041A adopts a plurality of vacuum arc-extinguishing chambers and a plurality of sets of electromagnetic repulsion mechanisms, the plurality of vacuum arc-extinguishing chambers are connected in series, each vacuum arc-extinguishing chamber is connected with one set of electromagnetic repulsion mechanism, and the multiple fractures are connected in series to increase the opening distance of the insulation fractures, so as to be able to bear higher voltage.

However, the circuit breaker has a very complicated overall structure due to the plurality of arc extinguishing chambers, which increases the volume of the circuit breaker and reduces the reliability of the operation of the circuit breaker.

Disclosure of Invention

The invention aims to provide a cascade progressive electromagnetic repulsion mechanism which can realize rapid switching-on and has a larger movement stroke, can directly drive an arc extinguish chamber with a large fracture interval to realize switching-on, and solves the problems of complex overall structure and large volume of a circuit breaker caused by the fact that a plurality of arc extinguish chambers are connected in series in the prior art; the invention also aims to provide a circuit breaker using the mechanism.

In order to achieve the purpose, the cascade progressive electromagnetic repulsion mechanism adopts the following technical scheme:

a cascade progressive electromagnetic repulsion mechanism comprising:

at least two electromagnetic repulsion units, electromagnetic repulsion unit includes:

a transmission rod;

the metal disc is fixedly connected with the transmission rod;

the closing repulsion coil is arranged on one side of the metal disc and is used for generating electromagnetic repulsion to the metal disc after being electrified so as to drive the transmission rod to move towards the closing direction;

the electromagnetic repulsion units are sequentially arranged along the front-rear direction, a transmission rod of the electromagnetic repulsion unit at the foremost end is used for being in transmission connection with the movable end of the arc extinguish chamber, and the transmission rods of two adjacent electromagnetic repulsion units are not connected;

when the electromagnetic repulsion unit is switched on, the switching-on repulsion coil of the electromagnetic repulsion unit at the forefront is firstly electrified, and the switching-on repulsion coil of the electromagnetic repulsion unit at the rear is sequentially electrified according to a set time interval, so that the transmission rod at the front moves firstly, the transmission rod at the rear moves backwards and impacts the transmission rod at the front, and the transmission rod at the front is continuously accelerated to move under stress.

The beneficial effects of the above technical scheme are that: the cascade progressive electromagnetic repulsion mechanism comprises at least two electromagnetic repulsion units, wherein the electromagnetic repulsion units are sequentially arranged along the front-back direction, and a transmission rod of the electromagnetic repulsion unit at the foremost end is used for being in transmission connection with the movable end of an arc extinguish chamber and can drive the movable end of the arc extinguish chamber to move so as to realize opening and closing; the transmission rods of two adjacent electromagnetic repulsion units are not connected, when the electromagnetic repulsion units are switched on, the switching-on repulsion coil of the electromagnetic repulsion unit at the foremost end is firstly electrified, thus, the transmission rod at the front end can move firstly, the closing repulsive coil of the electromagnetic repulsive unit at the rear end is electrified in sequence according to a set time interval, the rear transmission rods can also move in sequence, and as the transmission rod at the foremost end drives the movable end of the arc extinguish chamber to move, which is equivalent to move with a load, when the repulsion force of the closing repulsion coil to the metal disc is weakened, the moving speed of the transmission rod at the front end and the moving end of the arc extinguish chamber is reduced rapidly, but the transmission rod at the rear part begins to move forwards at the moment, and because the metal disc is not provided with a load, therefore, the front transmission rod can be quickly traced and impacted, so that the front transmission rod and the movable end of the arc extinguish chamber are stressed to continuously accelerate to move forwards.

By analogy, the transmission rod at the rear sequentially impacts the transmission rod in front according to the sequence, so that the movable end of the arc extinguish chamber can continuously bear force in the switching-on process, and continuously moves forwards, not only can a faster switching-on speed be obtained, but also the switching-on stroke of the electromagnetic repulsion mechanism is increased, the defects of short output time and short stroke of the electromagnetic repulsion mechanism are overcome, the arc extinguish chamber with a large fracture interval can be directly driven to realize switching-on, the rapid circuit breaker matched with the electromagnetic repulsion mechanism and provided with a single-fracture arc extinguish chamber can be applied to higher voltage level, a plurality of arc extinguish chambers are not required to be arranged in series, and the complex and large-size integral structure of the circuit breaker can be avoided.

Furthermore, in order to conveniently control the electrification of the closing repulsion coil, the electromagnetic repulsion unit further comprises a discharge circuit connected with the closing repulsion coil, and a pre-charging capacitor and a trigger switch are connected to the discharge circuit.

Furthermore, in order to prolong the service life, collision-resistant structures are arranged at the contact collision positions of two adjacent transmission rods.

In order to achieve the purpose, the circuit breaker adopts the following technical scheme:

the utility model provides a circuit breaker, includes an explosion chamber, and the explosion chamber moves the end including the explosion chamber, and circuit breaker still includes cascade progressive electromagnetic repulsion mechanism, and cascade progressive electromagnetic repulsion mechanism includes:

at least two electromagnetic repulsion units, electromagnetic repulsion unit includes:

a transmission rod;

the metal disc is fixedly connected with the transmission rod;

the closing repulsion coil is arranged on one side of the metal disc and is used for generating electromagnetic repulsion to the metal disc after being electrified so as to drive the transmission rod to move towards the closing direction;

the electromagnetic repulsion units are sequentially arranged along the front-rear direction, a transmission rod of the electromagnetic repulsion unit at the foremost end is in transmission connection with the movable end of the arc extinguish chamber, and the transmission rods of two adjacent electromagnetic repulsion units are not connected;

when the electromagnetic repulsion unit is switched on, the switching-on repulsion coil of the electromagnetic repulsion unit at the forefront is firstly electrified, and the switching-on repulsion coil of the electromagnetic repulsion unit at the rear is sequentially electrified according to a set time interval, so that the transmission rod at the front moves firstly, the transmission rod at the rear moves backwards and impacts the transmission rod at the front, and the transmission rod at the front is continuously accelerated to move under stress.

The beneficial effects of the above technical scheme are that: the cascade progressive electromagnetic repulsion mechanism comprises at least two electromagnetic repulsion units, wherein the electromagnetic repulsion units are sequentially arranged along the front-back direction, and a transmission rod of the electromagnetic repulsion unit at the foremost end is used for being in transmission connection with the movable end of an arc extinguish chamber and can drive the movable end of the arc extinguish chamber to move so as to realize opening and closing; the transmission rods of two adjacent electromagnetic repulsion units are not connected, when the electromagnetic repulsion units are switched on, the switching-on repulsion coil of the electromagnetic repulsion unit at the foremost end is firstly electrified, thus, the transmission rod at the front end can move firstly, the closing repulsive coil of the electromagnetic repulsive unit at the rear end is electrified in sequence according to a set time interval, the rear transmission rods can also move in sequence, and as the transmission rod at the foremost end drives the movable end of the arc extinguish chamber to move, which is equivalent to move with a load, when the repulsion force of the closing repulsion coil to the metal disc is weakened, the moving speed of the transmission rod at the front end and the moving end of the arc extinguish chamber is reduced rapidly, but the transmission rod at the rear part begins to move forwards at the moment, and because the metal disc is not provided with a load, therefore, the front transmission rod can be quickly traced and impacted, so that the front transmission rod and the movable end of the arc extinguish chamber are stressed to continuously accelerate to move forwards.

By analogy, the transmission rod at the rear sequentially impacts the transmission rod in front according to the sequence, so that the movable end of the arc extinguish chamber can continuously bear force in the switching-on process, and continuously moves forwards, not only can a faster switching-on speed be obtained, but also the switching-on stroke of the electromagnetic repulsion mechanism is increased, the defects of short output time and short stroke of the electromagnetic repulsion mechanism are overcome, the arc extinguish chamber with a large fracture interval can be directly driven to realize switching-on, the rapid circuit breaker matched with the electromagnetic repulsion mechanism and provided with a single-fracture arc extinguish chamber can be applied to higher voltage level, a plurality of arc extinguish chambers are not required to be arranged in series, and the complex and large-size integral structure of the circuit breaker can be avoided.

Furthermore, in order to conveniently control the electrification of the closing repulsion coil, the electromagnetic repulsion unit further comprises a discharge circuit connected with the closing repulsion coil, and a pre-charging capacitor and a trigger switch are connected to the discharge circuit.

Furthermore, in order to prolong the service life, collision-resistant structures are arranged at the contact collision positions of two adjacent transmission rods.

Drawings

Fig. 1 is a schematic diagram of a cascade progressive electromagnetic repulsion mechanism according to the present invention.

In the figure: 1. a movable end of the arc extinguish chamber; 2. a primary transmission rod; 3. a primary metal disc; 4. a first-stage closing repulsion coil; 5. a secondary transmission rod; 6. a secondary metal disk; 7. a second-stage closing repulsion coil; 8. n-level transmission rods; 9. an n-level metal disk; 10. n-stage closing repulsion coil; s1, a primary trigger switch; c1, a primary pre-charge capacitor; s2, a secondary trigger switch; c2, secondary pre-charge capacitor; sn, n-stage trigger switches; cn, n stage precharge capacitance.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The features and properties of the present invention are described in further detail below with reference to examples.

An embodiment of the cascade progressive electromagnetic repulsion mechanism is shown in fig. 1 and comprises n (n is more than or equal to 2) electromagnetic repulsion units, each electromagnetic repulsion unit comprises a transmission rod, a metal disc fixedly connected with the transmission rod and a closing repulsion coil arranged on one side of the metal disc, wherein the closing repulsion coil is used for generating electromagnetic repulsion to the metal disc after being electrified so as to drive the transmission rod to move towards the closing direction, and the principle is the same as that of the prior art.

Specifically, as shown in fig. 1, n electromagnetic repulsion units are a primary electromagnetic repulsion unit and a secondary electromagnetic repulsion unit … … n electromagnetic repulsion units, the n electromagnetic repulsion units are sequentially arranged along the front-back direction, the closing direction is from back to front, so the primary electromagnetic repulsion unit is the foremost electromagnetic repulsion unit, the primary electromagnetic repulsion unit comprises a primary transmission rod 2, a primary metal disc 3 and a primary closing repulsion coil 4, wherein the primary transmission rod 2 is closest to the arc extinguish chamber and is in transmission connection with the arc extinguish chamber moving end 1. The primary electromagnetic repulsion unit also comprises a primary discharge circuit connected with the primary closing repulsion coil 4, and the primary discharge circuit is connected with a primary pre-charge capacitor C1 and a primary trigger switch S1.

Similarly, the secondary electromagnetic repulsion unit comprises a secondary transmission rod 5, a secondary metal disc 6, a secondary closing repulsion coil 7 and a secondary discharge circuit connected with the secondary closing repulsion coil 7, and the secondary discharge circuit is connected with a secondary pre-charge capacitor C2 and a secondary trigger switch S2. In this way, the n-level electromagnetic repulsion unit comprises an n-level transmission rod 8, an n-level metal disc 9, an n-level closing repulsion coil 10 and an n-level discharge circuit connected with the n-level closing repulsion coil 10, wherein an n-level pre-charging capacitor Cn and an n-level trigger switch Sn are connected to the n-level discharge circuit.

In the n electromagnetic repulsion units, each closing repulsion coil (also called a discharge coil) is provided with an independent pre-charging capacitor, a discharge circuit (also called a trigger circuit) and a charging circuit (not shown in the figure), each pre-charging capacitor can set different charging voltages according to the output characteristics required by the mechanism, the metal disc and the transmission rod of each discharge coil are independent and are not connected with other transmission rods, namely the transmission rods of two adjacent electromagnetic repulsion units are not connected.

When the mechanism is switched on, starting from the discharge coil closest to the arc extinguish chamber moving end 1, the discharge coil discharges according to a preset time sequence, and repulsion is generated between the discharge coil and the corresponding metal disc. That is, the first-stage trigger switch S1 is first closed, the first-stage discharge circuit is turned on, and the first-stage pre-charge capacitor C1 discharges, so that the first-stage closing repulsive coil 4 is first energized, thereby generating an electromagnetic repulsive force on the first-stage metal disc 3, so that the first-stage metal disc 3 drives the first-stage transmission rod 2 to move, and the arc extinguish chamber moving end 1 starts to move. Then, the second-stage closing repulsive coil 7 starts to be electrified according to a set time interval, so that the second-stage transmission rod 5 acts behind the first-stage transmission rod 2, and the like, and the n-stage transmission rod 8 acts finally.

In the process, the first-stage transmission rod 2 drives the arc extinguish chamber moving end 1 to move, namely moving with a load, when the repulsion force of the first-stage closing repulsion coil 4 to the first-stage metal disc 3 is weakened, the moving speed of the first-stage transmission rod 2 and the arc extinguish chamber moving end 1 is reduced quickly, but the rear second-stage transmission rod 5 starts to move forwards at the moment, and the first-stage transmission rod 2 in front can quickly catch up and impact the first-stage transmission rod 2 due to no load, so that the first-stage transmission rod 2 and the arc extinguish chamber moving end 1 are stressed to continue to accelerate forwards. By analogy, the multistage transmission rod impacts the transmission rod of the previous stage in sequence, so that the movable end 1 of the arc extinguish chamber can continuously bear force in the switching-on process and continuously moves forwards, not only can a fast switching-on speed be obtained, but also the switching-on stroke of the electromagnetic repulsion mechanism is increased, the defects of short output time and short stroke of the electromagnetic repulsion mechanism are overcome, the arc extinguish chamber with a large fracture interval can be directly driven to realize switching-on, the rapid circuit breaker matched with the single-fracture arc extinguish chamber by the electromagnetic repulsion mechanism can be applied to higher voltage level, a plurality of arc extinguish chambers are not required to be arranged in series, and the complexity and the large volume of the whole structure of the circuit breaker can be avoided.

In conclusion, the electromagnetic repulsion units are sequentially arranged along the closing direction, the repulsion units are sequentially triggered to act according to the set time interval, the unit closest to the moving end of the arc extinguish chamber is triggered first, and the rest units are sequentially triggered from near to far according to the distance from the moving end of the arc extinguish chamber, so that the moving end of the arc extinguish chamber is continuously stressed in the motion acceleration process, and the stroke and the closing speed of the mechanism are improved. In addition, in order to prolong the service life, collision-resistant structures are arranged at the contact collision positions of two adjacent transmission rods, the collision-resistant structures can be collision-resistant blocks made of high-strength steel, and the transmission rods can also be integrally made of the high-strength steel.

It should be noted that the technical problem solved by the present invention is how to implement a large-stroke fast closing, and the opening process is not within the innovation of the present invention, so that the existing technical means in the prior art can be specifically adopted to implement opening, for example, each electromagnetic repulsion unit is provided with an opening repulsion coil.

In other embodiments of the cascade progressive electromagnetic repulsion mechanism, the collision-resistant structure may not be disposed at the contact collision position of two adjacent transmission rods, and the transmission rods need to be periodically maintained and replaced.

In other embodiments of the cascade progressive electromagnetic repulsion mechanism, the discharge circuit connected to the closing repulsion coil may also be connected to a power supply and a switch, and when the switch is closed, the power supply energizes the closing repulsion coil, and at this time, the closing timing and the closing time of the switch need to be controlled.

In other embodiments of the cascade progressive electromagnetic repulsion mechanism, the electromagnetic repulsion unit may not include a discharge circuit, that is, the product manufactured by the present invention does not include a discharge circuit, and the discharge circuit is configured and connected by a user according to the use requirement.

The embodiment of the circuit breaker in the invention is as follows: the circuit breaker comprises an arc extinguish chamber, the arc extinguish chamber comprises an arc extinguish chamber moving end, the circuit breaker further comprises a cascade progressive electromagnetic repulsion mechanism, and the specific structure of the cascade progressive electromagnetic repulsion mechanism is the same as that of the cascade progressive electromagnetic repulsion mechanism in the embodiment, and the details are not repeated here.

The above description is only a preferred embodiment of the present invention, and not intended to limit the present invention, the scope of the present invention is defined by the appended claims, and all structural changes that can be made by using the contents of the description and the drawings of the present invention are intended to be embraced therein.