CN221185067U - Resistance spot welding lower electrode assembly and resistance spot welding device - Google Patents

Abstract

The utility model discloses a resistance spot welding lower electrode assembly and a resistance spot welding device, wherein the resistance spot welding lower electrode assembly comprises a lower electrode and an electrode core, and the lower electrode is provided with an installation cavity and a through hole communicated with the installation cavity; the electrode core is arranged in the mounting cavity and can move back and forth along the first direction; and the electrode core is guided to the limiting part, and the cross section of the guiding limiting part is gradually reduced along the first direction and at least partially extends out of the through hole. According to the utility model, the resistance spot welding lower electrode assembly is applied to a resistance spot welding device for welding a nut and a sheet metal part, the lower electrode supports the sheet metal part, and the electrode core positions the sheet metal part and the nut, so that the axes of the mounting holes of the nut and the sheet metal part are positioned on the axis of the guide limiting part, thereby ensuring the assembly precision of the sheet metal part and the nut and reducing the subsequent assembly error. And the guiding and limiting part of the electrode core is gradually reduced, so that the welding device can adapt to nut welding of different specifications.

Description

Resistance spot welding lower electrode assembly and resistance spot welding device

Technical Field

The utility model relates to the technical field of welding, in particular to a resistance spot welding lower electrode assembly and a resistance spot welding device.

Background

The sheet metal parts are connected in a threaded mode generally, so that reliable connection between the sheet metal parts is achieved, and meanwhile the sheet metal parts are convenient to disassemble and assemble. The nut is fixed with one sheet metal part, so that the operation efficiency of the bolt connection is improved; the problem of accessibility of the nut position tool during manual assembly is also avoided. The efficiency is improved, and meanwhile, the manpower and material resources are saved.

The sheet metal part and the nut are connected in a pressure riveting, pull riveting or fusion welding mode; when the welding mode is adopted for connection, the nut needs manual positioning, positioning accuracy is complex, and dimensional errors are easily caused after welding.

Disclosure of utility model

The utility model mainly aims to provide a resistance spot welding lower electrode assembly and a resistance spot welding device, which aim to solve the problems that a fusion welding connection mode is complex in positioning and dimension errors are easy to cause after welding.

In order to achieve the above object, the present utility model provides a resistance spot welding lower electrode assembly, which includes a lower electrode and an electrode core, the lower electrode having a mounting cavity and a through hole communicating with the mounting cavity; the electrode core is arranged in the mounting cavity and can move back and forth along a first direction; the electrode core is provided with a guiding and limiting part, the cross section of the guiding and limiting part is gradually reduced along a first direction, and the guiding and limiting part at least partially extends out of the through hole.

In a specific embodiment, the lower electrode is provided with an air inlet channel communicated with the installation cavity, an air outlet gap is formed between the guiding limiting part and the inner wall of the through hole, and the electrode core can move towards the direction close to the bottom wall of the installation cavity so as to adjust the opening of the air outlet gap.

In a specific embodiment, the air inlet channel is formed on the side wall of the mounting cavity, and a gap exists between the part of the electrode core located in the mounting cavity and the side wall of the mounting cavity.

In a specific embodiment, the electrode core comprises a base part and the guiding limiting part which are connected with each other, the base part is accommodated in the mounting cavity, and the electrode core can move along the direction away from the bottom wall of the mounting cavity until the base part contacts with the top wall of the mounting cavity to seal the air outlet gap;

Or the outer side surface of the guiding and limiting part is a conical surface, the diameter of the bottom end of the guiding and limiting part is larger than the aperture of the through hole, and the electrode core can move along the direction away from the bottom wall of the mounting cavity until the outer side surface of the guiding and limiting part contacts with the bottom edge of the through hole so as to seal the air outlet gap;

Or the inner wall of the through hole is provided with a stop part protruding along the radial direction of the through hole, and the electrode core can move to the outer side surface of the guiding limiting part along the direction away from the bottom wall of the mounting cavity and is abutted with the stop part so as to block the air outlet gap.

In a specific embodiment, the resistance spot welding lower electrode assembly further comprises an elastic member, and two ends of the elastic member are respectively connected with the electrode core and the bottom wall of the mounting cavity.

In a specific embodiment, the lower electrode includes a lower electrode holder and an electrode cap that are detachably connected to each other, the lower electrode holder and the electrode cap surround to form the installation cavity, the electrode cap is provided with the through hole, and two ends of the elastic element are respectively connected with the electrode core and the lower electrode holder.

In a specific embodiment, the electrode cap comprises a top plate and a coaming connected with the edge of the top plate, wherein the top plate and the coaming enclose an inner cavity with a mounting opening at one side, and the through hole is formed in the top plate; the part of the inner cavity, which is close to the mounting opening, is a threaded section, and the lower electrode seat is in threaded connection with the threaded section so as to seal the mounting opening.

In a specific embodiment, a first limit groove is formed in one end of the electrode core, which is located in the installation cavity, a second limit groove is formed in the lower electrode seat, one end of the elastic piece is arranged in the first limit groove, and the other end of the elastic piece is arranged in the second limit groove.

In a specific embodiment, the elastic member is a spring.

In addition, the utility model also provides a resistance spot welding device, which comprises an upper electrode and the resistance spot welding lower electrode assembly, wherein the upper electrode is used for being in insulating contact with the electrode core and pushing the electrode core to move.

In a specific embodiment, a mounting groove is formed in the bottom surface of the upper electrode, and an insulating cushion block is embedded in the mounting groove and is arranged corresponding to the electrode core.

According to the technical scheme, the resistance spot welding lower electrode assembly is applied to a resistance spot welding device for welding a nut and a sheet metal part, wherein the lower electrode can support the sheet metal part, the part of an electrode core extending out of a through hole penetrates through a mounting hole in the sheet metal part and extends into a hollow part of the nut, and the axes of the nut and the mounting hole are located on the axis of a guide limiting part, so that the assembly precision of the sheet metal part and the nut is ensured, and the subsequent assembly error is reduced. And the end of the electrode core can be exposed from the upper part of the nut, in the welding process, the upper electrode of the resistance spot welding device moves downwards and contacts with the electrode core first to push the electrode core to move downwards until the upper electrode contacts with the nut and presses the nut on the sheet metal part, the upper electrode and the lower electrode are electrified, and the nut is fixed on the sheet metal part by resistance electric welding due to short circuit caused by contact of the nut with the sheet metal part. In addition, the resistance spot welding method has the advantages of small heat input amount and short welding time, and can effectively reduce the thermal deformation of the sheet metal part.

Because the direction spacing portion of electrode core is the convergent setting to can adapt to the nut welding of different specifications, when the well hollow part size of nut is less, the nut is not contacted with the sheet metal component when being fixed a position by the electrode core, and when the upper electrode promoted electrode core to move downwards, the nut whereabouts until contact with the sheet metal component.

Drawings

In order to more clearly illustrate the embodiments of the present 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, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic cross-sectional view of a resistance spot welding lower electrode assembly according to an embodiment of the present utility model;

FIG. 2 is a schematic view of an electrode cap according to an embodiment of the present utility model;

FIG. 3 is a schematic view of a limiting sheet metal part and a nut of a resistance spot welding lower electrode assembly in an embodiment of the utility model;

FIG. 4 is a schematic cross-sectional view of a resistance spot welding lower electrode assembly retainer sheet metal part and nut in an embodiment of the utility model;

FIG. 5 is a schematic cross-sectional view of an electrode cap according to an embodiment of the present utility model;

FIG. 6 is a schematic diagram of a bottom electrode holder according to an embodiment of the utility model;

FIG. 7 is a schematic view of an electrode core according to an embodiment of the present utility model;

fig. 8 is a schematic view of a resistance spot welding apparatus according to an embodiment of the present utility model.

Reference numerals illustrate:

the achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. 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.

It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present utility model are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.

Furthermore, descriptions such as those referred to as "first," "second," and the like, are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying an order of magnitude of the indicated technical features in the present disclosure. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In addition, the technical solutions of the embodiments of the present utility model may be combined with each other, but it is necessary to be based on the fact that those skilled in the art can implement the technical solutions, and when the technical solutions are contradictory or cannot be implemented, the combination of the technical solutions should be considered as not existing, and not falling within the scope of protection claimed by the present utility model.

The sheet metal parts are connected in a threaded mode generally, so that connection is achieved reliably, and meanwhile the sheet metal parts are convenient to disassemble and assemble. The method of fixing the nut and one of the sheet metal parts is generally adopted, specifically, a mounting hole is formed in the sheet metal part, the hollow part of the nut is aligned with the mounting hole and the nut is fixed on the sheet metal part, the inner diameter of the mounting hole is larger than that of the nut, and a bolt can penetrate through the other sheet metal part and the through hole to be in threaded connection with the nut, so that the other sheet metal part is fixed with the sheet metal part connected with the nut. Thereby improving the operation efficiency in bolting; the problem of nut position tool accessibility during manual assembly is avoided. The efficiency is improved, and meanwhile, the manpower and material resources are saved.

The sheet metal part and the nut are connected in a pressure riveting, pull riveting or fusion welding mode; when the welding mode is adopted for connection, the nut needs manual positioning, positioning accuracy is complex, and dimensional errors are easily caused after welding.

The utility model provides a resistance spot welding lower electrode assembly and a resistance spot welding device, and aims to solve the problems that a fusion welding connection mode is complex in positioning and dimension errors are easy to cause after welding.

As shown in fig. 1 and 2, in one embodiment of the present utility model, a resistance spot welding lower electrode assembly 100 includes a lower electrode 1 and an electrode core 2, the lower electrode 1 having a mounting cavity 131 and a through hole 133 communicating with the mounting cavity 131; the electrode core 2 is disposed in the mounting cavity 131, and the electrode core 2 can reciprocate along a first direction (a direction from bottom to top in fig. 1); the electrode core 2 has a guide stopper 21, the cross section of the guide stopper 21 is tapered in the first direction, and the guide stopper 21 is at least partially protruded from the through hole 133.

In this embodiment, the resistance spot welding lower electrode assembly 100 is applied to the resistance spot welding device 200 (as shown in fig. 8) for welding the nut 302 and the sheet metal part 301, as shown in fig. 3 and 4, the lower electrode 1 can support the sheet metal part 301, and the portion of the electrode core 2 extending from the through hole 133 passes through the mounting hole on the sheet metal part 301 and extends into the hollow part of the nut 302, so that the axes of the nut 302 and the mounting hole are both located on the axis of the guiding and limiting part 21, thereby ensuring the assembly accuracy of the sheet metal part 301 and the nut 302 and reducing the subsequent assembly error. And the end of the electrode core 2 can be exposed from the upper part of the nut 302, and in the welding process, the upper electrode 201 of the resistance spot welding device 200 moves downwards, is in insulating contact with the electrode core 2 first, pushes the electrode core 2 to move downwards until the upper electrode 201 contacts with the nut 302 and presses the nut 302 on the sheet metal part 301, the upper electrode 201 and the lower electrode 1 are electrified, and as the nut 302 contacts with the sheet metal part 301 to form a passage, the resistance is larger when current flows through the nut 302 and the sheet metal part 301, so that a large amount of heat is generated to realize resistance spot welding to fix the nut 302 on the sheet metal part 301. In addition, the resistance spot welding method has the advantages of small heat input amount and short welding time, and can effectively reduce the thermal deformation of the sheet metal part 301.

Because the guiding and limiting part 21 of the electrode core 2 is in a tapered arrangement, the welding of nuts 302 with different specifications can be adapted, when the size of the hollow part of the nut 302 is smaller, the nut 302 is not contacted with the sheet metal part 301 when being positioned by the electrode core 2, and the upper electrode 201 pushes the electrode core 2 to move downwards and simultaneously the nut 302 falls until contacting with the sheet metal part 301.

Specifically, the guiding and limiting portion 21 may have a cone structure, and the accurate positioning is achieved through the change of the cone surface, so that nuts 302 with different specifications can be matched.

The sheet metal part 301 may be a sheet metal shell of a charging pile, an automatic teller machine, an electric box and other devices, and the application scene of the sheet metal part 301 is not limited in the application. Before assembly, the resistance spot welding device 200 is used for welding the nuts 302 on the sheet metal part 301, so that subsequent assembly operation is convenient.

In an embodiment, the lower electrode 1 is provided with an air inlet channel 132 communicated with the mounting cavity 131, an air outlet gap 31 is formed between the guiding and limiting part 21 and the inner wall of the through hole 133, and the electrode core 2 can move towards the direction close to the bottom wall of the mounting cavity 131 to adjust the opening of the air outlet gap 31. The air inlet channel 132 is connected with an external air source and is used for filling protective gas into the mounting cavity 131, the pressure of the protective gas is larger than the atmospheric pressure, the protective gas can flow from the air outlet gap 31 to the hollow part of the nut 302 and the mounting hole of the sheet metal part 301, when the upper electrode 201 presses the electrode core 2 down but is not detected by the nut 302, a certain gap exists between the nut 302 and the upper electrode 201, so that air in the nut 302 and the mounting hole can be extruded from the gap, only the protective gas is left, and the upper electrode 201 descends until the nut 302 and the sheet metal part 301 are in contact with a conducting circuit, and the nut 302 and the sheet metal part 301 can be welded in a self-protective gas environment.

After the welding is finished, the upper electrode 201 rises, a certain gap exists between the nut 302 and the upper electrode 201 again, and the protective gas can blow out the suspended welding slag in the nut 302 and the mounting hole from the gap under the pressure effect, so that the welding slag is prevented from falling onto the threads.

The shielding gas can be carbon dioxide gas, argon gas and helium gas or other gases with a certain proportion are added on the basis of single gas to form mixed gas, and the welding area can be effectively protected by welding under the shielding gas, so that a high-quality welding seam is obtained.

In this embodiment, the guiding and limiting portion 21 may be a conical structure, and the length of the electrode core 2 in the nut 302 may be changed during the pressing down of the electrode core 2, so that the length of the electrode core 2 extending out of the surface of the nut 302 is changed by changing the length of the electrode core 2, and the size of the air outlet gap 31 may also be changed along with the difference of the pressed down distance of the electrode core 2 during the welding process, so as to control the air flow of the blown protection gas by changing the length of the electrode core 2.

In an example of the above embodiment, the air intake passage 132 is formed in the side wall of the mounting chamber 131, and a gap exists between the portion of the electrode core 2 located in the mounting chamber 131 and the side wall of the mounting chamber 131. When the electrode core 2 moves downwards, the air outlet gap 31 formed between the guiding and limiting part 21 and the through hole 133 is opened, and the electrode core 2 and the side wall of the mounting cavity 131 always have gaps, so that the air inlet channel 132 can be prevented from being blocked in the moving process of the electrode core 2, and the protective gas can be ensured to smoothly flow out of the air outlet gap 31.

The gap may be formed by vertically penetrating a notch in the electrode core 2 at a position corresponding to the air inlet channel 132, or may be formed by an annular gap formed by the electrode core 2 having a smaller size than the mounting cavity 131.

Based on the above embodiment, the electrode core 2 includes the base 22 and the guide stopper 21 connected to each other, the base 22 is housed in the installation cavity 131, and the electrode core 2 can be moved in a direction away from the bottom wall of the installation cavity 131 until the base 22 contacts with the top wall of the installation cavity 131 to block the air outlet gap 31. That is, the base 22 of the electrode core 2 abuts against the top wall of the mounting cavity 131 without contacting the upper electrode 201 with the electrode core 2. The upper electrode 201 continues to move downwards to push the electrode core 2 to move downwards to open the air outlet gap 31; and after the welding is completed, the electrode core 2 is lifted up together with the upper electrode 201 until the base 22 comes into contact with the top wall of the mounting cavity 131. Thereby realize the sealing of installation cavity 131 in getting the waiting time of putting sheet metal component 301 and nut 302, the shielding gas no longer flows this moment, reduces the waste of shielding gas.

In other embodiments, the electrode core 2 may also have a frustum-shaped structure, where the lower end of the electrode core 2 is a large-diameter end and the lower end of the electrode core 2 is larger than the through hole 133, so that the electrode core 2 can rise to make the side wall/bottom wall of the electrode core 2 contact with the lower edge/side edge of the through hole 133 to block the air outlet gap 31.

Specifically, the outer side surface of the guiding and limiting portion 21 may be a conical surface, the through hole 133 may be a cylindrical hole, the diameter of the bottom end of the guiding and limiting portion 21 is larger than the aperture of the through hole 133, and the electrode core 2 can move along the direction away from the bottom wall of the mounting cavity 131 until the outer side surface of the guiding and limiting portion 21 contacts with the bottom edge of the through hole 133 to seal the air outlet gap 31.

The inner wall of the through hole 133 may be provided with a stopper portion protruding in the radial direction of the through hole 133, and the electrode core 2 may be moved in a direction away from the bottom wall of the mounting cavity 131 until the outer side surface of the guide stopper portion 21 abuts against the stopper portion to block the air outlet gap 31.

The stop portion may be of annular configuration. Or the inner wall of the through hole 133 is also a conical surface, the conical degrees of the through hole 133 and the guiding and limiting part 21 are matched, and an air outlet channel 31 with the same width is formed between the guiding and limiting part 21 and the through hole 133.

Further, a sealing gasket may be provided on the upper side of the base 22, further ensuring a sealing effect when the base 22 is in contact with the top wall of the mounting cavity 131. Avoiding the escape of shielding gas from the gap between the base 22 and the top wall of the mounting cavity 131.

In one embodiment, the resistance spot welding lower electrode assembly 100 further includes an elastic member 4, and both ends of the elastic member 4 are connected to the electrode core 2 and the bottom wall of the mounting cavity 131, respectively. When the upper electrode 201 presses the electrode core 2 down, the elastic member 4 is compressed, and when the upper electrode 201 rises, the electrode core 2 moves up to contact with the top wall of the mounting cavity 131 under the action of the elastic member 4. Thereby, the electrode core 2 can move along with the upper electrode 201, and automatic resetting of the electrode core 2 is realized. The elastic member 4 may be a compression spring, a gas spring, a spring plate, a hydraulic spring, etc., and the present application is not limited to the kind of the elastic member 4.

In other embodiments, the electrode core 2 may be driven by a driving member, which drives the electrode core 2 to descend when the upper electrode 201 is pressed down, and drives the electrode core 2 to ascend when the upper electrode 201 is ascended after the welding is completed. The driving member may be a cylinder, a motor.

Referring to fig. 5 and 6, the lower electrode 1 includes a lower electrode holder 11 and an electrode cap 12 detachably connected to each other, a mounting cavity 131 is formed by surrounding the lower electrode holder 11 and the electrode cap 12, a through hole 133 is formed in the electrode cap 12, and two ends of the elastic member 4 are respectively connected to the electrode core 2 and the lower electrode holder 11. The top of electrode cap is the platform structure and is used for bearing sheet metal component 301, and lower electrode holder 11 and electrode cap 12 can dismantle the connection, conveniently dismantle and carry out a lot of cyclic utilization, and electrode core 2 according to the size of nut 302 change different specifications has realized a tractor serves several purposes simultaneously, has saved manpower, material resources, has got rid of special plane dedicated limitation, has reduced the cost.

Specifically, the electrode cap 12 includes a top plate 121 and a surrounding plate 122 connected to the edge of the top plate 121, the top plate 121 and the surrounding plate 122 enclose an inner cavity 124 with a mounting opening 123 at one side, and a through hole 133 is formed in the top plate 121; the part of the inner cavity 124 near the mounting opening 123 is a threaded section 125, and the lower electrode holder 11 is in threaded connection with the threaded section 125 to seal the mounting opening 123. The lower electrode holder 11 is connected with the electrode cap 12 through threads, the lower electrode holder 11 seals the mounting opening 123 to form a mounting cavity 131, when assembling is performed, the guiding and limiting part 21 of the electrode core 2 is inserted into the through hole 133, then the elastic piece 4 is placed, and finally the lower electrode holder 11 is screwed.

Referring to fig. 6 and 7 in combination, in order to prevent the spring of the elastic member 4 from shifting during the up-and-down movement of the electrode core 2, a first limiting groove 23 is formed at one end of the electrode core 2 located in the mounting cavity 131, a second limiting groove 111 is formed on the lower electrode base 11, one end of the elastic member 4 is disposed in the first limiting groove 23, and the other end of the elastic member 4 is disposed in the second limiting groove 111. The elastic piece 4 is limited through the first limiting groove 23 and the second limiting groove 111, and the compression direction of the elastic piece 4 can be limited, so that the elastic piece 4 is ensured to provide vertical upward supporting force for the electrode core 2.

In other embodiments, the elastic member 4 may be sized to conform to the inner wall of the mounting cavity 131, whereby the elastic member 4 is restrained by the inner wall of the mounting cavity 131 to avoid shifting during movement. Or the outside of electrode core 2 is provided with the stopper, and the spout is seted up to the inner wall of installation cavity 131, leads electrode core 2 through setting up the stopper slip in the spout.

In addition, as shown in fig. 8, the present utility model also provides a resistance spot welding apparatus 200, and the resistance spot welding apparatus 200 includes an upper electrode 201 and the resistance spot welding lower electrode assembly 100 as described above, wherein the upper electrode 201 is used to be in insulated contact with the electrode core 2 and push the electrode core 2 to move. The upper electrode 201 moves downward to contact the electrode core 2, at which time insulation is provided between the upper electrode 201 and the resistance spot welding lower electrode assembly 100 (simply referred to as a lower electrode assembly). The upper electrode 201 continues to move downwards to contact the upper electrode 201 with the nut 302, and the electrode core 2 is pushed to move downwards in the process of moving downwards of the upper electrode 201, so that the sheet metal part 301 falls on the lower electrode seat 11, the nut 302 falls on the sheet metal part 301 to realize sequential contact of the three, and a circuit is conducted to realize welding of the nut 302 and the sheet metal part 301. Further, since the resistance spot welding apparatus 200 includes the resistance spot welding lower electrode assembly 100 as described above, the resistance spot welding apparatus 200 has all the advantageous effects of the resistance spot welding lower electrode assembly 100 described above, and the description thereof will not be repeated.

In one embodiment, the bottom surface of the upper electrode 201 is provided with a mounting groove 202, and the insulating pad 203 is disposed in the mounting groove 202. In this embodiment, the mounting groove 202 is disposed opposite to the upper end of the electrode core 2, that is, when the upper electrode 201 is pressed down, the insulating pad 203 contacts with the electrode core 2, so as to realize insulation between the upper electrode 201 and the electrode core 2. After the insulating pad 203 is worn in the use process, the insulating pad 203 can be directly replaced.

The bottom surface of the insulating pad 203 should not protrude from the bottom surface of the upper electrode 201, and the bottom surface of the insulating pad 203 should be close to the inner hole of the nut 302, so as to ensure that the insulating pad 203 contacts with the electrode core 2, and ensure that the contact between the lower end surface of the upper electrode 201 and the nut 302 is not affected when the insulating pad 203 contacts with the electrode core 2.

In other embodiments, the insulating spacer 203 may be fixed to the upper electrode 201 by bonding. Or the upper electrode 201 is not provided with an insulating structure, and the electrode core 2 is made of an insulating material or the upper end part of the electrode core 2 is provided with an insulating structure, so that the contact part of the upper electrode 201 and the electrode core 2 can be insulated.

The foregoing description is only of the preferred embodiments of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structural changes made by the description of the present utility model and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the utility model.

Claims (11)

1. A resistance spot welding lower electrode assembly, comprising:

a lower electrode having a mounting cavity and a through hole communicating with the mounting cavity;

The electrode core is arranged in the mounting cavity and can move back and forth along a first direction; the electrode core is provided with a guiding and limiting part, the cross section of the guiding and limiting part is gradually reduced along a first direction, and the guiding and limiting part at least partially extends out of the through hole.

2. The resistance spot welding lower electrode assembly as set forth in claim 1, wherein an air inlet passage communicating with said installation cavity is provided in said lower electrode, an air outlet gap is formed between said guide stopper portion and an inner wall of said through hole, and said electrode core is movable in a direction approaching a bottom wall of said installation cavity to adjust an opening degree of said air outlet gap.

3. The resistance spot welding lower electrode assembly according to claim 2, wherein the air intake passage is formed in a side wall of the mounting chamber, and a gap exists between a portion of the electrode core located in the mounting chamber and the side wall of the mounting chamber.

4. The resistance spot welding lower electrode assembly of claim 2, wherein said electrode core includes a base portion and said guide limiter portion connected to each other, said base portion being received in said mounting cavity, said electrode core being movable in a direction away from a bottom wall of said mounting cavity to contact said base portion with a top wall of said mounting cavity to close said vent gap;

Or the outer side surface of the guiding and limiting part is a conical surface, the diameter of the bottom end of the guiding and limiting part is larger than the aperture of the through hole, and the electrode core can move along the direction away from the bottom wall of the mounting cavity until the outer side surface of the guiding and limiting part contacts with the bottom edge of the through hole so as to seal the air outlet gap;

Or the inner wall of the through hole is provided with a stop part protruding along the radial direction of the through hole, and the electrode core can move to the outer side surface of the guiding limiting part along the direction away from the bottom wall of the mounting cavity and is abutted with the stop part so as to block the air outlet gap.

5. The resistance spot welding lower electrode assembly according to any one of claims 1 to 4, further comprising an elastic member, both ends of which are respectively connected to the electrode core and the bottom wall of the mounting cavity.

6. The resistance spot welding lower electrode assembly as defined in claim 5, wherein said lower electrode includes a lower electrode holder and an electrode cap detachably connected to each other, said lower electrode holder and said electrode cap being surrounded to form said mounting cavity, said electrode cap being provided with said through hole, and both ends of said elastic member being connected to said electrode core and said lower electrode holder, respectively.

7. The resistance spot welding lower electrode assembly as defined in claim 6, wherein said electrode cap includes a top plate and a collar connected to an edge of said top plate, said top plate and said collar enclosing an interior cavity having a mounting opening on one side, said through hole opening in said top plate;

The part of the inner cavity, which is close to the mounting opening, is a threaded section, and the lower electrode seat is in threaded connection with the threaded section so as to seal the mounting opening.

8. The resistance spot welding lower electrode assembly of claim 6, wherein a first limiting groove is formed in one end of the electrode core located in the mounting cavity, a second limiting groove is formed in the lower electrode base, one end of the elastic piece is arranged in the first limiting groove, and the other end of the elastic piece is arranged in the second limiting groove.

9. The resistance spot welding lower electrode assembly of claim 5, wherein said resilient member is a spring.

10. A resistance spot welding apparatus comprising an upper electrode for making insulating contact with the electrode core and pushing the electrode core to move, and a resistance spot welding lower electrode assembly as claimed in any one of claims 1 to 9.

11. The resistance spot welding apparatus as defined in claim 10, wherein a mounting groove is formed in the bottom surface of the upper electrode, and an insulating spacer is embedded in the mounting groove, and the insulating spacer is disposed corresponding to the electrode core.