阅读说明：本技术 焊接主机及焊接设备 (Welding host and welding equipment ) 是由 陈罗 裴娟苗 于 2021-08-20 设计创作，主要内容包括：本发明涉及钢筋网焊接技术领域,具体涉及一种焊接主机及焊接设备。焊接主机包括机架和电极装置,电极装置包括：两组第一电极组件,设置在机架上,第一电极组件包括多个电连接的第一电极；第二电极组件,设置在机架上且包括多个电连接的第二电极,多个第二电极与多个第一电极一一对应设置；变压器,具有正极及负极,正极与一组第一电极组件连接,负极与另一组第一电极组件连接；活动电极组件,包括活动电极和驱动件,活动电极可活动地设置在机架上并与一对第一电极和第二电极对应设置,驱动件与活动电极连接,以使活动电极接触或远离其对应的第一电极和第二电极。本发明单点焊接时可通过活动电极导通两个电极,避免电极和钢筋损伤严重。(The invention relates to the technical field of reinforcement mesh welding, in particular to a welding host and welding equipment. The welding host computer includes frame and electrode assembly, and electrode assembly includes: two sets of first electrode assemblies disposed on the frame, the first electrode assemblies including a plurality of electrically connected first electrodes; the second electrode assembly is arranged on the frame and comprises a plurality of electrically connected second electrodes, and the plurality of second electrodes are arranged in one-to-one correspondence with the plurality of first electrodes; the transformer is provided with a positive electrode and a negative electrode, the positive electrode is connected with one group of first electrode assemblies, and the negative electrode is connected with the other group of first electrode assemblies; the movable electrode assembly comprises a movable electrode and a driving piece, wherein the movable electrode is movably arranged on the rack and corresponds to the pair of first electrodes and the pair of second electrodes, and the driving piece is connected with the movable electrode so that the movable electrode is in contact with or far away from the corresponding first electrodes and the corresponding second electrodes. According to the invention, two electrodes can be conducted through the movable electrode during single-point welding, so that the electrode and the reinforcing steel bar are prevented from being seriously damaged.)

1. Welding master, characterized in that it comprises a frame (10) and an electrode device comprising:

two sets of first electrode assemblies (20) arranged on the frame (10), each set of first electrode assemblies (20) comprising a plurality of first electrodes (21) arranged side by side and electrically connected;

a second electrode assembly (30) disposed on the frame (10), the second electrode assembly (30) including a plurality of second electrodes (31) disposed side by side and electrically connected, the plurality of second electrodes (31) being disposed in one-to-one correspondence with the plurality of first electrodes (21);

a transformer (40) having a positive electrode connected to one of the first electrode assemblies (20) and a negative electrode connected to the other of the first electrode assemblies (20);

the movable electrode assembly (50) comprises a movable electrode (51) and a driving piece (52), the movable electrode (51) is movably arranged on the rack (10) and is arranged corresponding to the first electrode (21) and the second electrode (31), and the driving piece (52) is connected with the movable electrode (51) so that the movable electrode (51) is in contact with or is far away from the corresponding first electrode (21) and the second electrode (31).

2. Welding host according to claim 1, wherein the movable electrode (51) is movably arranged on the machine frame (10).

3. Welding host according to claim 2, wherein the drive member (52) is a telescopic cylinder.

4. Welding master according to claim 1, characterized in that the movable electrode (51) is swingably arranged on the frame (10).

5. Welding master according to claim 4, wherein the drive member (52) is a rotary cylinder.

6. Welding master according to any one of claims 1 to 5, characterized in that said movable electrode assemblies (50) are provided in two, said two movable electrode assemblies (50) being respectively arranged in correspondence of one first electrode (21) of the two sets of first electrode assemblies (20).

7. The welding host according to any one of claims 1 to 5, further comprising a stationary electrode (60), the stationary electrode (60) being secured to one of the pair of first and second electrodes (21, 31), the movable electrode (51) being disposed proximate to the other of the pair of first and second electrodes (21, 31).

8. Welding host according to any one of claims 1 to 5, wherein the transformer (40) is arranged on the side of the first electrode (21) remote from the second electrode (31).

9. Welding host according to any one of claims 1 to 5, wherein said second electrode assembly (30) further comprises a second electrode holder on which a plurality of said second electrodes (31) are mounted.

10. A welding apparatus, comprising: the welding host of any one of claims 1 to 9.

Technical Field

The invention relates to the technical field of reinforcement mesh welding, in particular to a welding host and welding equipment.

Background

The steel bar mesh welding host machine is an automatic welding device which welds steel bars in two directions of longitudinal and transverse directions into a grid shape, the steel bar mesh welding host machine is stressed on the steel bars crossed longitudinally and transversely in the welding process, and the steel bars and the transverse bars are directly contacted through the upper electrode tip and the lower electrode tip and are welded.

At present, a welding host comprises an upper electrode and a lower electrode which are arranged in pairs, each paired upper electrode and lower electrode are provided with a transformer, when welding spots are more, the paired upper electrodes and lower electrodes exist, one transformer can only weld one spot at a time, the production efficiency is low, the number of transformers is large, independent conductive loops are large, the structure is complex, the production cost is high, and the maintenance cost is also high.

In order to improve the production efficiency, the welding host machine adopts the mode of establishing ties to weld two points simultaneously, when not having the longitudinal bar between paired upper electrode and lower electrode, then need be electrically conductive through horizontal muscle, can produce the spark between upper electrode and horizontal muscle when welding, causes the damage to upper electrode and horizontal muscle, produces the influence to the intensity of reinforcing bar net piece, and the upper electrode damage is serious, and the electrode replacement frequency is high, and manufacturing cost is high.

Disclosure of Invention

The invention mainly aims to provide a welding host and welding equipment, which are used for solving the problem that an upper electrode and a transverse rib are seriously damaged when the transverse rib conducts electricity in the prior art.

In order to achieve the above object, the present invention provides a welding host, including a frame and an electrode assembly, the electrode assembly including: two groups of first electrode assemblies arranged on the frame, wherein each group of first electrode assemblies comprises a plurality of first electrodes which are arranged side by side and electrically connected; the second electrode assembly is arranged on the frame and comprises a plurality of second electrodes which are arranged side by side and electrically connected, and the plurality of second electrodes are arranged in one-to-one correspondence with the plurality of first electrodes; the transformer is provided with a positive electrode and a negative electrode, the positive electrode is connected with one group of first electrode assemblies, and the negative electrode is connected with the other group of first electrode assemblies; the movable electrode assembly comprises a movable electrode and a driving piece, wherein the movable electrode is movably arranged on the rack and corresponds to the pair of first electrodes and the pair of second electrodes, and the driving piece is connected with the movable electrode so that the movable electrode is in contact with or far away from the corresponding first electrodes and the corresponding second electrodes.

Optionally, the movable electrode is movably disposed on the frame.

Optionally, the drive member is a telescopic cylinder.

Alternatively, the movable electrode may be swingably provided on the frame.

Optionally, the drive member is a rotary cylinder.

Optionally, two movable electrode assemblies are provided, and the two movable electrode assemblies are respectively arranged corresponding to one first electrode in the two groups of first electrode assemblies.

Optionally, the welding host further comprises a stationary electrode affixed to one of the pair of first and second electrodes, and the movable electrode is disposed proximate to the other of the pair of first and second electrodes.

Optionally, the transformer is arranged on a side of the first electrode remote from the second electrode.

Optionally, the second electrode assembly further comprises a second electrode holder, the plurality of second electrodes being mounted on the second electrode holder.

The present invention also provides a welding apparatus comprising: the welding host machine is described above.

The technical scheme of the invention has the following advantages: when the two first electrodes are pressed down simultaneously, the first electrode in one group of first electrode assemblies, the corresponding second electrode, the transverse rib, the longitudinal rib, the first electrode in the other group of first electrode assemblies, the corresponding second electrode and the movable electrode form a welding loop in series, the first electrode and the second electrode can be conducted through the movable electrode during single-point welding, the conduction through the transverse rib is not needed, and the serious damage of the electrodes and the transverse rib caused by the conduction through the transverse rib is effectively avoided, the strength of the reinforcing mesh is guaranteed, the service life of the first electrode is prolonged, the electrode replacement frequency is low, and the production cost is effectively reduced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 illustrates a partial perspective view of a first embodiment of a welding host of the present invention;

FIG. 2 shows an enlarged schematic view at A of the welding host of FIG. 1;

FIG. 3 illustrates a front view schematic of the welding host of FIG. 1;

FIG. 4 illustrates a side view schematic of the welding host of FIG. 1;

FIG. 5 illustrates a schematic diagram of the welding host of FIG. 1;

FIG. 6 is a schematic diagram illustrating the conduction of two pairs of upper and lower electrodes of the welding master of FIG. 5 via transverse and longitudinal ribs;

FIG. 7 is a schematic diagram illustrating the conduction of a pair of upper and lower electrodes of the welding master of FIG. 5 via transverse and longitudinal ribs and the conduction of another pair of upper and lower electrodes via a movable electrode;

FIG. 8 illustrates a schematic side view of a movable electrode assembly of the welding host of FIG. 1;

fig. 9 shows a schematic side view of the movable electrode assembly of a second embodiment of the welding master of the present invention.

Description of reference numerals:

10. a frame; 11. a right fuselage; 12. an upper cross beam; 13. a lower cross beam; 20. a first electrode assembly; 21. a first electrode; 30. a second electrode assembly; 31. a second electrode; 40. a transformer; 50. a movable electrode assembly; 51. a movable electrode; 52. a drive member; 53. a fixing plate; 60. a fixed electrode; 71. longitudinal ribs; 72. and transverse ribs.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

Example one

As shown in fig. 1 to 5, the welding host of the present embodiment includes: frame 10 and electrode assembly, the electrode assembly includes: two groups of first electrode assemblies 20, two groups of second electrode assemblies 30, a transformer 40 and a movable electrode assembly 50, wherein the two groups of first electrode assemblies 20 are arranged on the frame 10, and each group of first electrode assemblies 20 comprises a plurality of first electrodes 21 which are arranged side by side and are electrically connected; the second electrode assembly 30 is arranged on the frame 10, the second electrode assembly 30 comprises a plurality of second electrodes 31 which are arranged side by side and electrically connected, and the plurality of second electrodes 31 and the plurality of first electrodes 21 are arranged in a one-to-one correspondence manner; the transformer 40 has a positive electrode connected to one of the first electrode assemblies 20 and a negative electrode connected to the other of the first electrode assemblies 20; the movable electrode assembly 50 includes a movable electrode 51 and an actuating member 52, the movable electrode 51 is movably disposed on the frame 10 and is disposed to correspond to a pair of the first and second electrodes 21 and 31, and the actuating member 52 is connected to the movable electrode 51 such that the movable electrode 51 is brought into contact with or away from the corresponding first and second electrodes 21 and 31.

With the welding host of the present embodiment, when there are the longitudinal rib 71 and the transverse rib 72 between the first electrode 21 in one group of the first electrode assemblies 20 and the corresponding second electrode 31, and there is no longitudinal rib 71 and no transverse rib 72 between the first electrode 21 in the other group of the first electrode assemblies 20 and the corresponding second electrode 31, the movable electrode corresponding to the first electrode 21 in the other group of the first electrode assemblies 20 is driven to move, when the two first electrodes 21 are pressed down simultaneously, the first electrode 21 in one group of the first electrode assemblies 20 and the corresponding second electrode 31, the transverse rib 72, the longitudinal rib 71, and the first electrode 21 in the other group of the first electrode assemblies 20 and the corresponding second electrode 31, and the movable electrode 51 form a welding loop in series (as shown in fig. 7), the above structure can conduct two electrodes through the movable electrode during single spot welding, and does not need to conduct electricity through the transverse rib, the condition that the electrode and the transverse ribs are seriously damaged when the transverse ribs are conductive is effectively avoided, the strength of the reinforcing mesh is ensured, the service life of the first electrode is prolonged, the electrode replacement frequency is low, and the production cost is effectively reduced. When the longitudinal ribs and the transverse ribs are simultaneously arranged between the first electrodes 21 in the two groups of first electrode assemblies 20 and the corresponding second electrodes 31, and when the first electrodes 21 in the two groups of first electrode assemblies 20 are simultaneously pressed down, the first electrodes 21 in one group of first electrode assemblies 20 and the corresponding second electrodes 31, the transverse ribs and the longitudinal ribs thereof, and the first electrodes 21 in the other group of first electrode assemblies 20 and the corresponding second electrodes 31, the transverse ribs and the longitudinal ribs thereof form a welding loop (as shown in fig. 6) connected in series, one welding loop can simultaneously weld two points, the welding efficiency is high, the production efficiency is improved, and because the two points are welded in a series connection mode, the current is the same, the welding points are firm and reliable, and the welding quality is improved.

In the present embodiment, as shown in fig. 1, 2, and 8, the movable electrode 51 is movably disposed on the frame 10. The driving part 52 drives the movable electrode 51 to move, so that the movable electrode 51 is contacted with or far away from the first electrode 21 and the second electrode 31, when the movable electrode 51 is contacted with the corresponding first electrode 21 and the second electrode 31, the first electrode 21 and the second electrode 31 can be contacted and conducted through the movable electrode 51, and the serious damage of the first electrode and the transverse ribs caused by the conduction of the transverse ribs is effectively avoided.

In this embodiment, the driving member 52 is a telescopic cylinder, a piston rod of the telescopic cylinder is connected to the movable electrode 51, and the linear motion of the movable electrode is realized through the telescopic motion of the piston rod, so that the cylinder is convenient to use and low in cost. As an alternative embodiment, the driving member is a telescopic cylinder or a linear motor or the like.

In this embodiment, the movable electrode assembly 50 further includes a fixing plate 53, the driving member 52 is fixed on the fixing plate 53, and the fixing plate 53 is fixedly connected to the second electrode 31, so that the fixing is simple. Alternatively, the drive member 52 may be directly fixed to the frame.

In the present embodiment, two movable electrode assemblies 50 are provided, and the two movable electrode assemblies 50 are respectively provided corresponding to one first electrode 21 of the two sets of first electrode assemblies 20. The movable electrode 51 is correspondingly disposed on one first electrode 21 in each group of the first electrode assemblies 20, which is suitable for the situation that the transverse ribs and the longitudinal ribs cannot be simultaneously satisfied between two pairs of first electrodes and second electrodes.

It should be noted that, when there are both horizontal ribs and vertical ribs between the first electrodes and the corresponding second electrodes of the two groups of first electrode assemblies 20, the movable electrodes of the two groups of movable electrode assemblies 50 are respectively far away from the corresponding first electrodes and second electrodes; when the first electrode and the second electrode corresponding to one group of movable electrode assemblies 50 cannot satisfy the transverse rib and the longitudinal rib simultaneously, the driving member of the group of movable electrode assemblies 50 drives the movable electrode to move, so that the movable electrode is in contact with the corresponding first electrode and second electrode, and the movable electrode of the other group of movable electrode assemblies 50 is far away from the corresponding first electrode and second electrode.

In this embodiment, the welding host further includes a fixed electrode 60, the fixed electrode 60 is fixed on the first electrode 21 of the pair of first and second electrodes 21 and 31, the movable electrode 51 is disposed adjacent to the second electrode 31 of the pair of first and second electrodes 21 and 31, and the fixed electrode 60 is disposed to facilitate conduction between the first and second electrodes. Alternatively, a fixed electrode may not be provided, or a fixed electrode may be provided, the fixed electrode being fixed to the second electrode of the pair of first and second electrodes, and the movable electrode being provided adjacent to the first electrode of the pair of first and second electrodes.

In the present embodiment, as shown in fig. 1, the transformer 40 is disposed on the side of the first electrode 21 away from the second electrode 31, and the required copper connection is short, the cost is low, the conductive loop is short, and the soldering quality is high.

In this embodiment, the second electrode assembly 30 further includes a second electrode holder on which a plurality of second electrodes 31 are mounted. Because the positive pole and the negative pole of the transformer are both communicated with the first electrode, the plurality of second electrodes 31 only need to be arranged on one second electrode holder and are conducted through the second electrode holder, any copper strips, copper plates and the like do not need to be connected, and the structure is compact and simple and the cost is low. The plurality of electrode assemblies are provided, and the second electrode holders of the plurality of second electrode assemblies 30 may be integrally formed, that is, the second electrodes of the plurality of electrode assemblies are mounted on one second electrode holder and are conducted to each other through the second electrode holder.

In this embodiment, a plurality of electrode devices are arranged in proper order, can weld the mesh of different sizes, and equipment availability factor is high.

In the present embodiment, the number of the first electrodes 21 and the number of the second electrodes 31 of each electrode device are equal and even, the first electrodes 21 are divided into two groups, the first electrodes 21 between each group are conducted with each other through the flexible copper strips and the copper bars, the first electrode assemblies 20 of one group are connected to the positive pole of the secondary winding of the transformer 40, and the first electrode assemblies 20 of the other group are connected to the negative pole of the transformer 40.

In the present embodiment, as shown in fig. 1, the frame 10 includes a left body, a right body 11, an upper beam 12, a lower beam 13, and the like, wherein the upper beam 12 and the lower beam 13 are respectively connected to the left body and the right body 11; the number of the transformers 40 and the number of the electrode devices are 1, 2, 3 or 4 or more, and the transformers 40 are fixed on the upper portion of the frame 10.

In the present embodiment, the first electrode assembly is disposed above the second electrode assembly 30, where the first electrode assembly is an upper electrode assembly and the second electrode assembly 30 is a lower electrode assembly.

It can be understood that the upper electrode assembly includes an upper electrode, a cylinder, an upper electrode holder, a longitudinal rib limiting device, etc., the upper electrode is fixed on the upper beam 12 through the upper electrode holder, the welding action is realized through the expansion and contraction of the cylinder, the number of the upper electrodes of each electrode device is even, the upper electrodes are averagely divided into two groups, the upper electrodes in each group of upper electrode assemblies are communicated with each other through a copper plate, one group of upper electrode assemblies is connected with the positive electrode of the secondary winding of the transformer 40, and the other group of upper electrode assemblies is connected with the negative electrode of the transformer.

It can be understood that the lower electrode assembly is fixed on the lower beam 13, the lower electrode assembly includes lower electrode holders, lower electrodes, etc., the number of the lower electrodes is the same as that of the upper electrodes, and the lower electrodes are in one-to-one correspondence, and all the lower electrodes are mounted on one lower electrode holder and are conducted with each other through the lower electrode holders.

It can be understood that the movable electrode assemblies 50 are also fixed on the lower beam 13, the movable electrode assemblies 50 include movable electrodes 51 and air cylinders, the number of the movable electrode assemblies 50 is the same as that of the upper electrode assemblies, one movable electrode assembly 50 corresponds to one group of upper electrode assemblies, and the movable electrode 51 can move to the lower electrode through the extension and contraction of the air cylinders, so that the upper electrode and the lower electrode can be conducted when the upper electrode is pressed down.

It will be appreciated that the transformer 40 is located above the first electrode 21 and requires a short copper connection, is low cost, has a short conductive loop and is high quality solder.

It should be noted that a solid line circle above the transverse rib 72 in fig. 5 to 7 refers to the longitudinal rib 71, and a dotted line circle above the transverse rib 72 in fig. 5 to 7 refers to another position where the longitudinal rib 71 can be placed, and at this time, two longitudinal rib limiting grooves are provided on the upper electrode, and the position of the longitudinal rib 71 can be adjusted according to specific situations.

Example two

As shown in fig. 9, the welding host of the second embodiment is different from the first embodiment in the movement manner of the movable electrode 51, in the second embodiment, the movable electrode 51 is swingably disposed on the frame 10, and the swing of the movable electrode 51 is driven by the driving member 52, so that the movable electrode 51 is brought into contact with or separated from the upper electrode and the lower electrode.

In this embodiment, the driving member 52 is a rotary cylinder, an output shaft of the rotary cylinder is connected to the movable electrode 51, and the movable electrode swings by the rotation of the output shaft. As an alternative embodiment the drive member is an electric motor or the like.

As an alternative embodiment, the first electrode assembly is disposed below the second electrode assembly, where the first electrode assembly is a lower electrode assembly, the second electrode assembly is an upper electrode assembly, the upper electrode assembly includes a plurality of upper electrodes, the lower electrode assembly is provided with two sets each including a plurality of lower electrodes, the lower electrodes of each set of lower electrode assembly are in electrical communication with each other, the transformer is disposed below the lower electrode assembly, and all the upper electrodes are in electrical communication with each other.

The present invention also provides a welding apparatus, comprising: the welding host machine is described above. When a pair of upper electrode, can't satisfy simultaneously horizontal muscle between the bottom electrode, when indulging the muscle, the movable electrode passes through the flexible or rotatory portable or rotation of cylinder to the bottom electrode on, can make the upper electrode when the upper electrode pushes down, the bottom electrode passes through the movable electrode contact, and then make the welding return circuit switch on, just so need not electrically conduct through horizontal muscle, cause the serious condition of upper electrode and horizontal muscle damage when avoiding electrically conducting through horizontal muscle effectively, guarantee the intensity of reinforcing bar net piece, the life of extension electrode, the electrode replacement frequency is low, and production cost is effectively reduced.

From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects:

1. the welding host comprises a rack and a plurality of electrode devices, each electrode device comprises an upper electrode, a lower electrode, a transformer, movable electrodes and the like, the upper electrodes are divided into two groups to form upper electrode assemblies, the upper electrodes among the upper electrode assemblies in each group are mutually conducted through a soft copper strip and a copper bar, one group of upper electrode assemblies are connected with the positive electrode of a secondary winding of the transformer, the other group of upper electrode assemblies are connected with the negative electrode of the transformer, the number of the movable electrodes in each electrode device is 2, the two movable electrodes are respectively arranged corresponding to one upper electrode of the two groups of upper electrode assemblies, one movable electrode can conduct the positive electrode of the transformer, and the other movable electrode can conduct the negative electrode of the transformer. When two groups of upper electrode assemblies are provided with an upper electrode pressed downwards and a transverse rib and a longitudinal rib are arranged between lower electrodes corresponding to the upper electrodes, a welding loop in series connection is formed, two points can be welded at the same time by one conductive loop, and the production efficiency is high; when a pair of upper electrode, can't satisfy between the lower electrode and have horizontal muscle simultaneously, when indulging the muscle, then do not have horizontal muscle, it is rotatory or remove to the upper and lower electrode that corresponds with it to indulge the movable electrode that electrode assembly corresponds on that group of muscle or do not have the muscle, when two upper electrode push down, form the welding return circuit through the movable electrode, only weld a point this moment, just so need not be through horizontal muscle electrically conductive, avoid causing the serious condition of upper electrode and horizontal muscle damage when electrically conductive through horizontal muscle effectively, guarantee the intensity of reinforcing bar net piece, the life of extension electrode, the electrode replacement frequency is low, effectively reduction in production cost, the welding efficiency who has solved among the prior art is low, welding quality is poor, problems such as with high costs.

2. The transformer is arranged above the upper electrode, the required copper connecting pieces are few, the conductive loop is short, the structure is simple, the cost is low, and the welding quality is high.

3. All lower electrodes are arranged on the same lower electrode holder and are mutually conducted through the lower electrode holder, any copper strips, copper plates and the like do not need to be connected, and the structure is compact and simple and the cost is low.

4. The movable electrode is made of materials with good conductivity, good machining performance and moderate price, such as chromium, zirconium, copper and the like, and the driving part is a telescopic cylinder, a rotary cylinder and the like.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.