CN220359413U - Buffer connection device and plasma generator - Google Patents

Abstract

The utility model relates to a buffer connection device and a plasma generator, wherein the buffer connection device comprises a first connection seat, a second connection seat and an elastic piece, and the first connection seat is used for connecting a cathode; the second connecting seat is used for connecting the driving end of the driving mechanism, and the first connecting seat is movably connected with the second connecting seat so that the second connecting seat can reciprocate along a preset direction relative to the first connecting seat; the elastic piece is arranged between the two connecting seats and is used for providing pretightening force so that the driving end of the driving mechanism and the second connecting seat are kept at a first limit relative position; the buffer connection device can avoid overload and locked rotation of the electric push rod through elastic deformation of the buffer connection device, so that the problem that the electric push rod is overheated and even burnt out is avoided, meanwhile, the problems that an arc starting failure is caused by difficulty in quick disconnection of a cathode and an anode and a screw pair of the electric push rod is easy to damage are avoided, normal operation and service life of a plasma generator are guaranteed, and maintenance cost is reduced.

Description

Buffer connection device and plasma generator

Technical Field

The utility model relates to the technical field of plasma generators, in particular to a buffer connection device and a plasma generator.

Background

When the plasma generator starts an arc, the driving mechanism is required to drive the cathode gun to move forward, the cathode contacts with the anode, the cathode is delayed for a short time, then the cathode gun is driven to move backward, the cathode leaves the anode, at the moment, an electric arc is generated between the cathode and the anode, and carrier working medium (air) is ionized into high-temperature plasma by the electric arc and is sprayed out from the anode nozzle.

The electric push rod has the advantages of novelty, elegance, small volume, high precision, easy control, complete synchronization, good self-locking performance and the like, so the driving mechanism of the plasma generator at present is widely selected for the electric push rod. Because the electric push rod does not have a buffering function, and the cathode and anode contact requires extremely short time delay, when the time delay is finished after the cathode and the anode contact, the electric push rod continuously pushes the cathode, and the following problems are easy to occur: 1. in the time delay period, the cathode is blocked by the anode, and the electric push rod continuously pushes the cathode, so that the electric push rod is overloaded and locked, the motor is easy to heat, the service life is influenced, and even the motor is burnt out to lose efficacy; 2. because the electric push rod is continuously pushed, the cathode is tightly plugged into the anode taper hole, so that the electric push rod cannot drive the cathode to rapidly separate from the anode after the delay is finished, and arc starting failure is caused; 3. when the electric push rod drives the cathode which is tightly plugged into the anode taper hole to be disconnected, the screw nut of the electric push rod is damaged by threads due to insufficient strength.

The above problems affect the normal operation and service life of the plasma generator, increase maintenance cost, further restrict the normal operation of the system equipment (such as the pulverized coal boiler of a power plant, a hazardous waste treatment device and the like) with the plasma generator, even stop production, and cause unnecessary loss to enterprises.

Disclosure of Invention

The first objective of the present utility model is to provide a buffer connection device, so as to avoid overload and locked rotation of an electric push rod, and thus avoid the problems that the cathode and the anode are too tightly matched to be smoothly separated from an opening arc, and the electric push rod is easy to be damaged.

A second object of the present utility model is to provide a plasma generator comprising the above-mentioned buffer connection device.

In order to achieve the above purpose, the present utility model provides the following technical solutions:

a buffer connection device for connection between a cathode of a plasma generator and a drive end of a drive mechanism for driving the cathode to reciprocate relative to an anode of the plasma generator, comprising:

the first connecting seat is used for connecting the cathode;

the second connecting seat is used for connecting the driving end of the driving mechanism, and the first connecting seat is movably connected with the second connecting seat so that the driving end of the driving mechanism can reciprocate between a first limit relative position and a second limit relative position along a preset direction relative to the first connecting seat;

the elastic piece is arranged between the first connecting seat and the second connecting seat, and is used for providing pretightening force to enable the driving end of the driving mechanism and the second connecting seat to be kept at a first limit relative position relative to the first connecting seat, so that the driving end of the driving mechanism drives the cathode to be in contact with the anode through the buffer connecting device in the arc starting process, and the driving end of the driving mechanism can continuously drive the second connecting seat to move towards a second limit relative position relative to the first connecting seat.

Optionally, one of the first connecting seat and the second connecting seat is provided with a limiting chute extending along the preset direction, the other one of the first connecting seat and the second connecting seat is provided with a limiting pin, the limiting chute is in sliding fit with the limiting pin, and positions of two ends of the limiting chute when the two ends of the limiting chute are matched with the limiting pin are the first limit relative position and the second limit relative position respectively.

Optionally, under the constraint of the limiting pin, the travel of the limiting chute in the preset direction is larger than the travel of the driving end of the driving mechanism in the preset contact delay time of the cathode and the anode.

Optionally, one of the first connecting seat and the second connecting seat is provided with an assembling groove, the other one of the first connecting seat and the second connecting seat is provided with an assembling part, the assembling part is embedded into the assembling groove and can reciprocate in the assembling groove along the preset direction, and the matching surfaces of the assembling groove and the assembling part are respectively provided with the limiting pin and the limiting chute.

Optionally, the first end and the second end of the second connecting seat are respectively located at two sides of the first connecting seat, the first end of the second connecting seat is used for facing the driving mechanism and is connected with the driving end of the driving mechanism, and the elastic piece is arranged between the second end of the second connecting seat and the first connecting seat.

Optionally, the second connecting seat includes connecting seat main part, optical axis portion and connecting portion, the connecting seat main part set up two parallel opposite planes, with first connecting seat clearance fit and swing joint, optical axis portion with connecting portion are followed the preset direction set up respectively in the both sides of connecting seat main part, connecting portion is as the first end of second connecting seat with actuating mechanism's drive end is connected, the elastic component is including compressing tightly apron, compression spring and baffle, the baffle cover is located optical axis portion, compress tightly apron detachably set up in optical axis portion's terminal surface, compression spring set up in the baffle with compress tightly between the apron, with the baffle support press in first connecting seat makes baffle with first connecting seat in close contact.

Optionally, a step surface is formed between the optical axis portion and the connecting seat main body, and when the driving end of the driving mechanism and the second connecting seat are located at the first limit relative position, a gap is formed between the step surface and the baffle.

Optionally, the minimum working load of the compression spring is larger than the friction force between the gun body of the cathode and the bracket body of the anode, and the maximum working load of the compression spring is smaller than the driving force of the driving mechanism.

Optionally, at least one of the first connection seat and the second connection seat is made of an insulating material.

A plasma generator comprising a cathode, an anode and a drive mechanism for driving the cathode to reciprocate relative to the anode, the drive end of the drive mechanism being connected to the cathode by a buffer connection arrangement as described above.

Optionally, the drive mechanism and the anode are located on the same side of the buffer connection.

Optionally, the driving mechanism is a linear motor; or the drive mechanism comprises a rotating motor and a transmission assembly.

As can be seen from the above technical solution, the present utility model discloses a buffer connection device for connection between a cathode of a plasma generator and a driving end of a driving mechanism, wherein the driving end of the driving mechanism is used for driving the cathode to reciprocate relative to an anode of the plasma generator, the buffer connection device comprises a first connection seat, a second connection seat and an elastic member, wherein the first connection seat is used for connecting the cathode; the second connecting seat is used for connecting the driving end of the driving mechanism, and the first connecting seat is movably connected with the second connecting seat so that the second connecting seat can reciprocate between a first limit relative position and a second limit relative position along a preset direction relative to the first connecting seat; the elastic piece is arranged between the first connecting seat and the second connecting seat, and the elastic piece is used for providing pretightening force to enable the driving end of the driving mechanism and the second connecting seat to be kept at a first limit relative position relative to the first connecting seat, so that when the driving end of the driving mechanism drives the cathode to contact with the anode through the buffer connecting device in the arc starting process, the driving end of the driving mechanism can continuously drive the second connecting seat to move towards a second limit relative position relative to the first connecting seat.

When the arc is started, a power supply is connected, a control program is started, the driving end of the driving mechanism is controlled to drive the cathode to move towards the anode through the buffer connection device, when the cathode is not in contact with the anode, the driving end of the driving mechanism and the second connection seat are kept at a first limit relative position and are not moved under the action of pretightening force provided by the elastic piece, when the cathode is in contact with the anode, short delay time is entered, the driving force of the driving end of the driving mechanism overcomes the elastic force of the elastic piece, so that the driving end of the driving mechanism and the first connection seat are relatively displaced, namely, the cathode is not moved, the driving end of the driving mechanism continues to move towards the anode, namely, moves towards the second limit relative position, but is not allowed to reach the second limit relative position, allowance is required to be reserved, and after the delay time is ended, the driving end of the driving mechanism rapidly and reversely moves, and the second connection seat returns to the first limit relative position under the elastic action of the elastic piece.

Therefore, when the driving mechanism is an electric push rod, overload and locked rotation of the electric push rod cannot occur, so that the problem that the electric push rod is overheated or even burnt is avoided, meanwhile, the driving force of the electric push rod in the time delay period is absorbed by the elastic part and converted into elastic potential energy of the elastic part, the elastic potential energy of the elastic part cannot directly act on the cathode, the problem that the cathode and the anode are too tightly matched, and arc starting failure caused by rapid disengagement after the time delay is difficult to complete is solved, and the problem that a lead screw pair of the electric push rod is easily damaged in the disengagement process caused by too tightly matched cathode and anode is also avoided, so that the normal operation and the service life of the plasma generator are ensured, and the maintenance cost is reduced.

The utility model also provides a plasma generator, which comprises a cathode, an anode and a driving mechanism, wherein the driving mechanism is used for driving the cathode to reciprocate relative to the anode, and the driving end of the driving mechanism is connected with the cathode through the buffer connection device, and the plasma generator adopts the buffer connection device in the embodiment, so that the plasma generator has the same beneficial effects as the buffer connection device and is not repeated herein.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a buffer connection device provided in an embodiment of the present utility model before and after an arc is opened;

fig. 2 is a schematic structural diagram of a buffer connection device provided in an embodiment of the present utility model in a short delay process of arc starting.

In the figure:

1 is a first connecting seat; 2 is a second connecting seat; 201 is a connection base body; 202 is a connection portion; 203 is an optical axis portion; 3 is a driving mechanism; 301 is the driving end; 4 is a cathode; 5 is an anode; 6 is a limiting pin; 7 is a limiting chute; 8 is an elastic piece; 801 is a compression cover plate; 802 is a compression spring; 803 is a baffle; 9 is a substrate; 10 is a connecting pin shaft; 11 is a bracket body.

Detailed Description

One of the key points of the utility model is to provide a buffer connection device, which has a structural design to avoid overload and locked rotation of an electric push rod, so as to avoid the problems that the cathode and the anode are too tightly matched to be smoothly separated from an opening arc and the electric push rod is easy to damage.

Another core of the present utility model is to provide a plasma generator comprising the above-mentioned buffer connection device.

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1 and fig. 2, fig. 1 is a schematic structural diagram of a buffer connection device provided in an embodiment of the present utility model before and after an arc is started, and fig. 2 is a schematic structural diagram of the buffer connection device provided in an embodiment of the present utility model during a short delay of the arc starting.

The embodiment of the utility model discloses a buffer connection device, which is used for connecting a cathode 4 of a plasma generator and a driving end 301 of a driving mechanism 3, wherein the driving end 301 of the driving mechanism 3 is used for driving the cathode 4 to reciprocate relative to an anode 5 of the plasma generator, and the buffer connection device comprises a first connection seat 1, a second connection seat 2 and an elastic piece 8.

Wherein the first connecting seat 1 is used for connecting the cathode 4; the second connecting seat 2 is used for connecting the driving end 301 of the driving mechanism 3, and the first connecting seat 1 is movably connected with the second connecting seat 2, so that the second connecting seat 2 can reciprocate between a first limit relative position and a second limit relative position along a preset direction relative to the first connecting seat 1.

Preferably, the above-mentioned preset direction is the same as the driving direction of the driving end 301 of the driving mechanism 3, and in the embodiment shown in fig. 1 and 2, the preset direction is the left-right direction in the drawing.

In the embodiment of the present utility model, the buffer connection device is mainly aimed at a driving mechanism 3 using a motor as a power source, such as an electric push rod, and it should be noted that, of course, the driving mechanism 3 of the plasma generator is not limited to the electric push rod, or is not limited to the motor as the power source, and other driving mechanisms 3 may be adopted, specifically, the driving mechanism 3 of the plasma generator includes, but is not limited to, a combination mechanism of a linear motor, a rotating motor and a transmission mechanism, where the transmission mechanism is used to convert rotation of the rotating motor into reciprocal movement, and the transmission mechanism includes, but is not limited to, a screw mechanism, a cam link mechanism, a rack-and-pinion mechanism, and a link mechanism.

The elastic piece 8 is arranged between the first connecting seat 1 and the second connecting seat 2, and the elastic piece 8 is used for providing a pretightening force to enable the driving end 301 of the driving mechanism 3 and the second connecting seat 2 to be kept at a first limit relative position relative to the first connecting seat 1, so that when the driving end 301 of the driving mechanism 3 drives the cathode 4 to be contacted with the anode 5 through the buffer connecting device in the arc starting process, the driving end 301 of the driving mechanism 3 can continuously drive the second connecting seat 2 to move towards a second limit relative position relative to the first connecting seat 1, but the second limit relative position is not allowed to be reached, and the allowance is required to be reserved.

The working process of the buffer connection device is as follows: when the arc is started, a power supply is connected, a control program is started, the driving end 301 of the driving mechanism 3 is controlled to drive the cathode 4 to move towards the anode 5 through the buffer connection device, when the cathode 4 is not contacted with the anode 5, the driving end 301 of the driving mechanism 3 and the second connection seat 2 are kept at a first limit relative position and are not moved under the action of the elastic piece 8, when the cathode 4 is contacted with the anode 5, a short delay time (generally not more than 1 second) is entered, the driving end 301 of the driving mechanism 3 continuously drives the cathode 4 towards the anode 5, at the moment, the driving force of the driving end 301 of the driving mechanism 3 overcomes the elastic force of the elastic piece 8, so that the driving end 301 of the driving mechanism 3 and the first connection seat 1 are relatively moved, namely the cathode 4 is not moved, the driving end 301 of the driving mechanism 3 continuously moves towards the anode 5, namely towards the second limit relative position, but the second limit relative position is not allowed to reach, a margin is reserved, and after the delay time, the driving end 301 of the driving mechanism 3 rapidly moves reversely, and the second connection seat 2 returns to the first limit relative position under the elastic action of the elastic piece 8.

In order to enable the control program to accurately start time delay and timing, in the embodiment of the utility model, a pressure detection device can be arranged between the elastic piece 8 and the first connecting seat 1 and/or between the elastic piece 8 and the second connecting seat 2, when the driving end 301 of the driving mechanism 3 and the second connecting seat 2 are positioned at the first limit relative position, the pressure detection device does not send out a signal, the control program does not start time delay and timing, when the driving end 301 of the driving mechanism 3 and the first connecting seat 1 start relative displacement, the pressure detection device detects that the elastic piece 8 is elastically deformed, a timing signal is sent to the control program, and the control program starts timing.

Compared with the prior art, the buffer connection device provided by the embodiment of the utility model can prevent the movement of the driving end 301 of the driving mechanism 3 from being influenced by the elastic deformation of the elastic piece 8 in the time delay period after the cathode 4 is contacted with the anode 5, so that the overload and locked rotation of the electric push rod can not occur when the driving mechanism 3 is the electric push rod, the problem that the electric push rod is overheated or even burnt out can be avoided, meanwhile, the driving force of the electric push rod in the time delay period is absorbed by the elastic piece 8 and converted into the elastic potential energy of the elastic piece 8, the elastic potential energy can not be directly acted on the cathode 4, the problem that the cathode 4 and the anode 5 are excessively tightly matched and the arc starting failure caused by the rapid disconnection after the time delay is difficult to finish can be avoided, and the problem that the lead screw pair of the electric push rod is easily damaged in the disconnection process caused by the excessively tightly matched cathode 4 and the anode 5 can be avoided, so that the normal operation and the service life of the plasma generator are ensured, and the maintenance cost is reduced.

In order to enable the driving end 301 of the driving mechanism 3 and the second connecting seat 2 to accurately stay at the first limit relative position and the second limit relative position, in the embodiment of the utility model, one of the first connecting seat 1 and the second connecting seat 2 is provided with a limit chute 7 extending along the preset direction, the other one of the first connecting seat 1 and the second connecting seat 2 is provided with a limit pin 6, the limit pin 6 can play a role of limiting, and also can play a role of connecting the second connecting seat 2 and the first connecting seat 1, namely, the other one of the first connecting seat 1 and the second connecting seat 2 is provided with a pin hole, when the second connecting seat 2 and the first connecting seat 1 are assembled in place, the limit pin 6 passes through the limit chute 7 and the pin hole to complete the assembly of the second connecting seat 2 and the first connecting seat 1, the limit chute 7 is in sliding fit with the limit pin 6, and the positions of the limit chute 7 and the two ends of the limit pin 6 are respectively the first limit relative position and the second limit relative position.

As shown in fig. 1 and fig. 2, in a specific embodiment of the present utility model, the first connecting seat 1 is provided with a limiting pin 6, the second connecting seat 2 is provided with a limiting chute 7 extending along a preset direction, and when the driving end 301 of the driving mechanism 3 drives the cathode 4 to pass through the support body 11 of the anode 5 to contact with the anode 5 through the above-mentioned buffer connection device in the arc starting process, the driving end 301 of the driving mechanism 3 continuously drives the second connecting seat 2 to move relative to the first connecting seat 1, and at this time, the second connecting seat 2 moves forward under the constraint of the limiting pin 6 of the first connecting seat 1 through the limiting chute 7.

As a preference, in the embodiment of the present utility model, the stroke L of the limit chute 7 in the preset direction constrained by the limit pin 6 is greater than the stroke of the driving end 301 of the driving mechanism 3 within the preset delay time, that is, during the delay time period, the driving end 301 of the driving mechanism 3 may drive the second connection seat 2 to move relative to the first connection seat 1 to a position where the limit pin 6 is located away from the first limit relative position and is close to the second limit relative position, as shown in fig. 2.

In the embodiment of the present utility model, one of the first connecting seat 1 and the second connecting seat 2 is provided with an assembly groove, the assembly groove may be a groove with a closed circumference and two open ends, that is, the groove is opened along a direction perpendicular to a preset direction, or may be an open U-shaped groove, two opposite side wall directions of the open U-shaped groove are preset directions, the other one of the first connecting seat 1 and the second connecting seat 2 is provided with an assembly part, the assembly part is embedded into the assembly groove and can reciprocate in the assembly groove along the preset direction, and the mating surfaces of the assembly groove and the assembly part are respectively provided with a limiting pin 6 and a limiting chute 7.

Specifically, in the embodiment shown in fig. 1 and 2, the first connecting seat 1 is provided with an assembly groove with two closed circumferential ends and two open ends, the assembly groove is provided with through pin holes on two opposite side walls perpendicular to the preset direction, the middle part, namely the main body, of the second connecting seat 2 is provided with two parallel opposite planes, a through limit chute 7 is arranged on the middle part, the main body is used as an assembly part to extend into the assembly groove and is connected with the cathode 4, and the limit pin 6 penetrates through the limit chute 7 to be matched with the pin holes.

In order to reduce the size of the whole plasma generator, the arrangement of the driving mechanism 3, the buffer connection device, the cathode 4 and the anode 5 is facilitated, and in the embodiment of the present utility model, the first end and the second end of the second connection seat 2 are located at two sides of the first connection seat 1, respectively, the first end of the second connection seat 2 is used for facing the driving mechanism 3 and being connected with the driving end 301 thereof, and the elastic member 8 is disposed between the second end of the second connection seat 2 and the first connection seat 1, in which case the driving mechanism 3 and the anode 5 can be placed at the same side of the buffer connection device to reduce the space occupation of the whole in the length direction.

Specifically, as shown in fig. 1 and 2, in the embodiment of the present utility model, the second connecting seat 2 includes a connecting seat main body 201, an optical axis portion 203, and a connecting portion 202, the connecting seat main body 201 is movably connected with the first connecting seat 1, the optical axis portion 203 and the connecting portion 202 are respectively disposed on two sides of the connecting seat main body 201 along a preset direction, the connecting portion 202 is used as a first end of the second connecting seat 2 to be connected with the driving end 301 of the driving mechanism 3, the connecting portion 202 may be connected with the driving end 301 of the driving mechanism 3 in various manners, for example, may be connected by a pin joint, a screw joint, a clamping joint, or the like, as shown in fig. 1 and 2, in the embodiment of the present utility model, the connecting portion 202 is connected with the driving end 301 of the driving mechanism 3 by a connecting pin 10, the connecting portion 202 is disposed with the driving end 301 of the driving mechanism 3 by a connecting pin hole, and the connecting pin 10 passes through the connecting pin hole on the connecting portion 202 and the driving end 301 of the driving mechanism 3 to fix the two relatively.

The elastic member 8 includes a pressing cover plate 801, a compression spring 802, and a baffle 803, where the baffle 803 is sleeved on the optical axis portion 203, and the pressing cover plate 801 is detachably disposed on the optical axis portion 203, and the compression spring 802 is disposed between the baffle 803 and the pressing cover plate 801, so as to press the baffle 803 against the first connection seat 1, so that the baffle 803 is in close contact with the first connection seat 1.

The minimum working load of the compression spring 802 should be greater than the friction between the gun body of the cathode 4 and the bracket body 11 of the anode 5, and the maximum working load should be less than the driving force of the driving mechanism 3.

As can be seen from fig. 1 and 2, a stepped surface is provided between the connector body 201 and the optical axis 203, and a gap is provided between the baffle 803 and the stepped surface when the driving end 301 of the driving mechanism 3 and the second connector 2 are at the first limit relative position.

Preferably, in the embodiment of the present utility model, at least one of the first connecting seat 1 and the second connecting seat 2 is made of an insulating material, and further, the first connecting seat 1 and the second connecting seat 2 are preferably made of nylon PA66 with high strength and high rigidity.

The embodiment of the present utility model further provides a plasma generator, which includes a cathode 4, an anode 5, and a driving mechanism 3, wherein the driving mechanism 3 is used for driving the cathode 4 to reciprocate relative to the anode 5, and the driving end 301 of the driving mechanism 3 is connected to the cathode 4 through the buffer connection device according to the above embodiment.

As shown in fig. 1 and 2, in the embodiment of the present utility model, the driving mechanism 3 and the anode 5 are located on the same side of the buffer connection device, the driving mechanism 3 is fixed to the base plate 9, the anode 5 is fixed to the support body 11, the base plate 9 is connected with the support body 11 integrally, and is not detachable, when the driving end 301 of the driving mechanism 3 retracts toward the body direction of the driving mechanism 3 in application, the cathode 4 is close to the anode 5, and when the driving end 301 of the driving mechanism 3 extends toward the body direction away from the driving mechanism 3, the cathode 4 is far away from the anode 5.

It should be noted that, in the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described as different from other embodiments, and identical and similar parts between the embodiments are all enough to be referred to each other.

It should also be noted that, in this document, terms such as "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an 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 article or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in an article or apparatus that comprises such element.

The principles and embodiments of the present utility model have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the core concepts of the utility model. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the utility model can be made without departing from the principles of the utility model and these modifications and adaptations are intended to be within the scope of the utility model as defined in the following claims.

Claims (12)

1. A buffer connection device for connection between a cathode of a plasma generator and a drive end of a drive mechanism for driving the cathode to reciprocate relative to an anode of the plasma generator, comprising:

the first connecting seat is used for connecting the cathode;

the second connecting seat is used for being connected with the driving end of the driving mechanism, and the first connecting seat is movably connected with the second connecting seat;

the elastic piece is arranged between the first connecting seat and the second connecting seat, and is used for providing pretightening force to enable the driving end of the driving mechanism and the second connecting seat to be kept at a first limit relative position relative to the first connecting seat, so that the driving end of the driving mechanism drives the cathode to be in contact with the anode through the buffer connecting device in the arc starting process, and the driving end of the driving mechanism can continuously drive the second connecting seat to move towards a second limit relative position relative to the first connecting seat.

2. The cushion connecting device according to claim 1, wherein one of the first connecting seat and the second connecting seat is provided with a limit chute extending along a preset direction, the other of the first connecting seat and the second connecting seat is provided with a limit pin, the limit chute is in sliding fit with the limit pin, and positions of the limit chute when the limit chute is matched with two ends of the limit pin are the first limit relative position and the second limit relative position respectively.

3. The cushion attachment of claim 2, wherein the travel of the limit chute in the predetermined direction is greater than the travel of the drive end of the drive mechanism within a predetermined contact delay time of the cathode and the anode under the restraint of the limit pin.

4. A buffer connection device according to claim 2 or 3, wherein one of the first connection seat and the second connection seat is provided with an assembly groove, the other of the first connection seat and the second connection seat is provided with an assembly part, the assembly part is embedded in the assembly groove and can reciprocate in the assembly groove along the preset direction, and the matching surfaces of the assembly groove and the assembly part are respectively provided with the limiting pin and the limiting chute.

5. A cushioning connection device according to claim 2 or 3, wherein the first and second ends of the second connection socket are located on opposite sides of the first connection socket, respectively, the first end of the second connection socket being adapted to face the driving mechanism and to be connected to the driving end of the driving mechanism, and the elastic element being arranged between the second end of the second connection socket and the first connection socket.

6. The buffer connection device according to claim 5, wherein the second connection base includes a connection base main body, an optical axis portion and a connection portion, the connection base main body is provided with two parallel opposite planes, the two planes are in clearance fit with the first connection base and are movably connected with each other, the optical axis portion and the connection portion are respectively arranged on two sides of the connection base main body along the preset direction, the connection portion serves as a first end of the second connection base and is connected with the driving end of the driving mechanism, the elastic member includes a pressing cover plate, a compression spring and a baffle plate, the baffle plate is sleeved on the optical axis portion, the pressing cover plate is detachably arranged on an end face of the optical axis portion, and the compression spring is arranged between the baffle plate and the pressing cover plate so as to press the baffle plate on the first connection base, so that the baffle plate is in close contact with the first connection base.

7. The cushion connection device according to claim 6, wherein a stepped surface is formed between the optical axis portion and the connection seat main body, and a gap is formed between the stepped surface and the baffle plate when the driving end of the driving mechanism and the second connection seat are at the first limit relative position.

8. The cushion connection according to claim 6, wherein a minimum working load of the compression spring is greater than a friction force between the gun body of the cathode and the bracket body of the anode, and a maximum working load of the compression spring is less than a driving force of the driving mechanism.

9. The cushion attachment device according to any one of claims 1-3 and 6-8, wherein at least one of the first attachment seat and the second attachment seat is made of an insulating material.

10. A plasma generator comprising a cathode, an anode and a drive mechanism for driving the cathode in reciprocating motion relative to the anode, wherein the drive end of the drive mechanism is connected to the cathode by a buffer connection arrangement according to any one of claims 1 to 9.

11. The plasma generator of claim 10, wherein the drive mechanism and the anode are located on the same side of the buffer connection.

12. The plasma generator of claim 10, wherein the drive mechanism is a linear motor; or the drive mechanism comprises a rotating motor and a transmission assembly.