阅读说明：本技术 Pin针超声焊接的焊接头结构、Pin针结构及焊接装置、方法 (Welding head structure for ultrasonic welding of Pin needle, Pin needle structure, welding device and welding method ) 是由 潘昭海 方杰 冯加云 徐凝华 贺新强 张贤坤 曾雄 翁嘉男 于 2021-10-28 设计创作，主要内容包括：本发明提供了一种Pin针超声焊接的焊接头结构、Pin针结构及焊接装置、方法,该焊接头结构包括焊接头本体,所述焊接头本体呈柱状,其内部中心处具有沿其轴向延伸的空腔,所述空腔的一端延伸至所述焊接头本体一端的端面并在所述端面的中心形成开口；所述焊接头本体的内部在靠近所述空腔的另一端处开设有气体通道,所述气体通道连通所述空腔；或所述空腔的内壁上在靠近所述开口处设置有至少一个弹性圈,所述弹性圈嵌设于所述空腔的内壁且其表面凸出于所述空腔的内壁面。基于本发明的技术方案,焊接头利用真空吸附结构或弹性圈结构对Pin针进行吸附并固定,保证了Pin针在焊接头本体内部以及后续超声焊接过程中的衬板或模块上的定位精度。(The invention provides a welding head structure for ultrasonic welding of a Pin needle, the Pin needle structure, a welding device and a welding method, wherein the welding head structure comprises a welding head body, the welding head body is columnar, a cavity extending along the axial direction of the welding head body is arranged in the center of the welding head body, one end of the cavity extends to the end face of one end of the welding head body, and an opening is formed in the center of the end face; a gas channel is arranged at the other end of the inside of the welding head body, which is close to the cavity, and the gas channel is communicated with the cavity; or at least one elastic ring is arranged on the inner wall of the cavity close to the opening, the elastic ring is embedded in the inner wall of the cavity, and the surface of the elastic ring protrudes out of the inner wall surface of the cavity. Based on the technical scheme of the invention, the welding head utilizes the vacuum adsorption structure or the elastic ring structure to adsorb and fix the Pin needle, thereby ensuring the positioning accuracy of the Pin needle in the welding head body and on a lining plate or a module in the subsequent ultrasonic welding process.)

1. A welding head structure for ultrasonic welding of a Pin needle is characterized by comprising a welding head body, wherein the welding head body is columnar, a cavity extending along the axial direction of the welding head body is arranged in the center of the welding head body, one end of the cavity extends to the end face of one end of the welding head body, and an opening is formed in the center of the end face;

a gas channel is arranged at the other end of the inside of the welding head body, which is close to the cavity, and the gas channel is communicated with the cavity; or

At least one elastic ring is arranged on the inner wall of the cavity close to the opening, the elastic ring is embedded in the inner wall of the cavity, and the surface of the elastic ring protrudes out of the inner wall surface of the cavity.

2. The ultrasonic welding head structure of the Pin needle as defined in claim 1, wherein a plurality of welding grooves are formed in said end surface of said welding head body, and a portion of said end surface located between said plurality of welding grooves forms a first welding tooth.

3. The ultrasonic Pin-welded joint structure as claimed in claim 2, wherein the overall arrangement of said plurality of weld grooves is in the form of a mesh, and said first welding teeth are in the form of a grid.

4. The ultrasonic welding head structure of the Pin needle as claimed in claim 2 or 3, wherein the part of the end face close to the opening is located outside the distribution range of the weld groove, and the part close to the opening is a second annular weld tooth surrounding the opening.

5. The ultrasonic Pin-welded joint structure as claimed in claim 1, wherein said elastic ring is a one-piece annular structure extending continuously in a circumferential direction along an inner wall of said cavity; or

The elastic ring is of a split type annular structure consisting of a plurality of parts which are distributed at intervals along the circumferential direction of the inner wall of the cavity.

6. A Pin needle structure for ultrasonic welding of a Pin needle, which is applied to the bonding head structure of any one of claims 1 to 5, comprising:

the connecting seat is of a flat plate structure and is circular, square or other regular polygons in shape;

the connecting body is of a solid columnar structure or a hollow tubular structure, and one end of the connecting body is fixed in the center of the connecting seat;

the connecting body can be accommodated in a cavity on the welding head body in the welding head structure, and when the connecting body is accommodated in the cavity, the surface of the connecting seat is in contact with the end surface of the welding head body.

7. The Pin needle ultrasonically welded Pin needle structure of claim 6, wherein the coupling body has an outer diameter 0.01-0.3mm less than the inner diameter of the cavity and a length 0.5-5mm less than the length of the cavity.

8. Pin needle structure for ultrasonic welding of a Pin needle according to claim 6 or 7, characterized in that the thickness of the coupling seat is 0.1-2 mm.

9. The Pin needle structure of claim 6 wherein said Pin needle structure is comprised of TU1 oxygen free copper or TU2 oxygen free copper with a hardness of 50-120 HV.

10. A welding device for ultrasonic welding of a Pin needle, comprising the welding head structure according to any one of claims 1 to 5, characterized by further comprising:

a moving support movable in a horizontal plane;

the connecting shaft is vertically connected below the movable support, and the tail end of the bottom of the connecting shaft is connected with a welding head body in the welding head structure;

the welding head body can move along the connecting shaft and can rotate around the connecting shaft.

11. The Pin needle ultrasonic welding device according to claim 10, further comprising a vacuum member communicating with a cavity inside the welding head body through a gas passage inside the welding head body.

12. A welding method of ultrasonic welding of Pin needles, characterized in that it is applied to a welding device according to claim 10 or 11, characterized by comprising the steps of:

s1, conveying the Pin needle to a welding station;

s2, moving a welding head body in the welding device to the position above the Pin needle and descending to completely accommodate the coupling body of the Pin needle in the cavity inside the welding head body;

s3, horizontally moving the welding head body and driving the Pin needle to move to a preset welding position for ultrasonic welding;

and S4, lifting the welding head body to be completely separated from the Pin needle, and horizontally moving for resetting.

13. The method for ultrasonic welding of Pin needles as claimed in claim 12, wherein in step S2:

for the welding head body with an air channel inside, after the coupling body of the Pin needle is completely accommodated in the cavity, vacuum is formed in the cavity by a vacuum pumping member to fix the Pin needle.

14. The method of ultrasonic Pin needle welding as defined in claim 13, wherein in step S4:

and for the welding head body with an air channel inside, before the welding head body rises to be completely separated from the Pin needle, introducing gas into the cavity to normal pressure or high pressure through a vacuumizing part.

Technical Field

The invention relates to the technical field of power semiconductor devices, in particular to a welding head structure for ultrasonic welding of a Pin needle, the Pin needle structure, a welding device and a welding method.

Background

With the rise of new energy automobiles, the IGBT (insulated gate bipolar transistor) module is more and more widely applied to electric automobiles by virtue of the characteristics of large input impedance, small driving power, simple control circuit, small switching loss, high on-off speed, high working frequency and the like. At present, in a conventional IGBT module structure with a Pin needle, a square Pin needle is usually inserted into a needle seat by mechanical force (or an integrated Pin needle is adopted), and the Pin needle and the needle seat are connected by welding with solder.

However, when the IGBT module is applied to the automobile field, the requirements for the shock resistance, temperature change resistance, and life reliability of the IGBT module are very strict. A traditional welding method of welding with solder is adopted, a welding layer at a joint is a weak point of a module, and the risk of falling off of a Pin needle exists in the application process. In addition, the Pin needle is difficult to position by adopting a welding flux welding mode, the deviation of the position degree is large, and the positioning precision is low. In the subsequent assembly process, the problem that the Pin needle interferes with the cover plate and the PCB is easily caused.

Therefore, it is necessary to provide a welding head structure, a Pin needle structure, and a welding method based on ultrasonic welding to solve the above problems.

Disclosure of Invention

In order to solve the problems in the prior art, the application provides a welding head structure, a Pin needle structure, a welding device and a welding method for ultrasonic welding of a Pin needle, the welding head structure, the Pin needle structure, the welding device and the welding method are designed for the ultrasonic welding, the Pin needle is adsorbed and fixed by using a vacuum adsorption structure or an elastic ring structure, and the positioning precision of the Pin needle on a welding head body and the positioning precision of the Pin needle on a lining plate or a module in the subsequent ultrasonic welding process are guaranteed.

In a first aspect, the invention provides a welding head structure for ultrasonic welding of a Pin needle, which comprises a welding head body, wherein the welding head body is columnar, a cavity extending along the axial direction of the welding head body is arranged in the center of the welding head body, one end of the cavity extends to the end face of one end of the welding head body, and an opening is formed in the center of the end face;

a gas channel is arranged at the other end of the inside of the welding head body, which is close to the cavity, and the gas channel is communicated with the cavity; or

At least one elastic ring is arranged on the inner wall of the cavity close to the opening, the elastic ring is embedded in the inner wall of the cavity, and the surface of the elastic ring protrudes out of the inner wall surface of the cavity.

In one embodiment, the end surface of the welding head body is provided with a plurality of welding grooves, and a portion of the end surface between the plurality of welding grooves forms a first welding tooth.

In one embodiment, the overall layout of the plurality of welding grooves is in a net shape, and the first welding teeth are in a grid shape.

In one embodiment, a portion of the end surface close to the opening is located outside a distribution range of the welding grooves, and the portion close to the opening is an annular second welding tooth surrounding the opening. Through the embodiment, when the second welding teeth contact the surface of the Pin needle, the annular contact surface which is relatively sealed can be formed on the periphery of the opening, so that the sealing performance of the inside of the cavity relative to the outside is ensured, and the adsorption effect of vacuum adsorption is ensured.

In one embodiment, the resilient ring is a one-piece annular structure extending continuously circumferentially along the inner wall of the cavity; or the elastic ring is a split type annular structure consisting of a plurality of parts which are distributed along the circumferential direction of the inner wall of the cavity at intervals.

In a second aspect, the present invention provides a Pin needle structure for ultrasonic welding of a Pin needle, which is applied to the above-mentioned welding head structure, and includes:

the connecting seat is of a flat plate structure and is circular, square or other regular polygons in shape;

the connecting body is of a solid columnar structure or a hollow tubular structure, and one end of the connecting body is fixed in the center of the connecting seat;

the connecting body can be accommodated in a cavity on the welding head body in the welding head structure, and when the connecting body is accommodated in the cavity, the surface of the connecting seat is in contact with the end surface of the welding head body.

In one embodiment, the outer diameter of the coupling body is 0.01-0.3mm smaller than the inner diameter of the cavity and the length of the coupling body is 0.5-5mm smaller than the length of the cavity.

In one embodiment, the thickness of the coupling seat is 0.1-2 mm.

In one embodiment, the Pin needle structure is made of TU1 oxygen-free copper or TU2 oxygen-free copper, and the hardness of the Pin needle structure is 50-120 HV.

In a third aspect, the present invention provides a welding device for ultrasonic welding of a Pin needle, including the above welding head structure, further including:

a moving support movable in a horizontal plane;

the connecting shaft is vertically connected below the movable support, and the tail end of the bottom of the connecting shaft is connected with a welding head body in the welding head structure;

the welding head body can move along the connecting shaft and can rotate around the connecting shaft.

In one embodiment, the vacuum pumping component is communicated with a cavity inside the welding head body through a gas channel inside the welding head body.

In a fourth aspect, the present invention provides a welding method for ultrasonic welding of a Pin needle, which is applied to the welding apparatus described above, and includes the following steps:

s1, conveying the Pin needle to a welding station;

s2, moving a welding head body in the welding device to the position above the Pin needle and descending to completely accommodate the coupling body of the Pin needle in the cavity inside the welding head body;

s3, horizontally moving the welding head body and driving the Pin needle to move to a preset welding position for ultrasonic welding;

and S4, lifting the welding head body to be completely separated from the Pin needle, and horizontally moving for resetting.

In one embodiment, in step S2:

for the welding head body with an air channel inside, after the coupling body of the Pin needle is completely accommodated in the cavity, vacuum is formed in the cavity by a vacuum pumping member to fix the Pin needle.

In one embodiment, in step S4:

and for the welding head body with an air channel inside, before the welding head body rises to be completely separated from the Pin needle, introducing gas into the cavity to normal pressure or high pressure through a vacuumizing part.

The features mentioned above can be combined in various suitable ways or replaced by equivalent features as long as the object of the invention is achieved.

Compared with the prior art, the welding head structure, the Pin needle structure, the welding device and the welding method for ultrasonic welding of the Pin needle provided by the invention at least have the following beneficial effects:

according to the welding joint structure, the Pin structure, the welding device and the welding method for ultrasonic welding of the Pin needle, the ultrasonic welding joint is designed in a targeted manner, the Pin needle is adsorbed and fixed by using the vacuum adsorption structure or the elastic ring structure, and the positioning accuracy of the Pin needle on the welding joint body and the positioning accuracy of the Pin needle on the lining plate or the module in the subsequent ultrasonic welding process are ensured. And, compare in current complicated location frock, the structure of whole soldered connection is also simpler. Meanwhile, the welding head is based on ultrasonic welding, and compared with the existing welding flux welding, the reliability of the welding structure is higher.

Drawings

The invention will be described in more detail hereinafter on the basis of embodiments and with reference to the accompanying drawings. Wherein:

FIG. 1 shows an end schematic view of one configuration of a weld head body of the present invention;

FIG. 2 shows a cross-sectional view of the bond head body of FIG. 1 in engagement with a Pin Pin;

FIG. 3 shows an end view of another configuration of the weld head body of the present invention;

FIG. 4 shows a cross-sectional view of the end structure of the weld head body shown in FIG. 3;

FIG. 5 shows a cross-sectional view of the tip structure of the bond head body of FIG. 3 mated with a Pin Pin;

fig. 6 to 8 show schematic views of three different structures of the Pin needle structure of the present invention, respectively;

FIG. 9 is a diagram showing the change of the fitting state of the welding head body and the Pin needle in the welding process according to the present invention;

fig. 10 shows a schematic view of the structure of the welding apparatus of the present invention.

In the drawings, like parts are provided with like reference numerals. The drawings are not to scale.

Reference numerals:

10-welding head body, 101-gas channel, 102-welding groove, 103-first welding tooth, 104-second welding tooth, 11-cavity, 111-opening, 12-expanding part, 20-elastic ring, 30-Pin needle, 31-connecting seat, 32-connecting body, 40-moving bracket and 50-connecting shaft.

Detailed Description

The invention will be further illustrated with reference to the following examples and the accompanying drawings.

The invention provides a welding head structure for ultrasonic welding of a Pin needle, which comprises a welding head body 10, wherein the welding head body 10 is columnar, a cavity 11 extending along the axial direction of the welding head body is arranged at the center of the welding head body 10, one end of the cavity 11 extends to the end face of one end of the welding head body 10, and an opening 111 is formed in the center of the end face;

a gas channel 101 is formed in the other end, close to the cavity 11, of the inside of the welding head body 10, and the gas channel 101 is communicated with the cavity 11; or

At least one elastic ring 20 is arranged on the inner wall of the cavity 11 near the opening 111, and the elastic ring 20 is embedded in the inner wall of the cavity 11 and the surface of the elastic ring protrudes out of the inner wall surface of the cavity 11.

Specifically, as shown in fig. 1 to 5 of the drawings, the welding head structure of the present invention mainly includes a welding head body 10, and the welding head body 10 is a columnar structure, which is usually an inverted conical columnar structure in practical application, so as to facilitate pressure bearing and make the structure more stable. The welding head body 10 is provided with a cavity 11 therein, the cavity 11 is located at the center of the welding head body 10, and the cavity 11 extends to the end surface of the welding head body 10 along the axial direction of the welding head body 10 and forms an opening 111 on the end surface. The cavity 11 is cylindrical in shape and is intended to receive a Pin 30 to be soldered. Before welding, the welding head body 10 needs to drive the Pin needle 30 to be welded to move and position, and during welding, the welding head body 10 needs to keep the position of the Pin needle 30 fixed. Therefore, the bonding head body 10 needs to be further provided with a structure for fixing the Pin 30, and the present embodiment will be described in detail with respect to the following two fixing structures:

firstly, the welding head body 10 can be fixed to the Pin needle 30 by vacuum suction, as shown in fig. 1 and 2. The inside of the bonding head body 10 is further opened with a gas passage 101 communicating with the cavity 11, and the gas passage 101 communicates with an external vacuum-pumping member. At this time, the cavity 11 needs to reserve a part of the space for making vacuum after accommodating the Pin needle 30 while maintaining a sealing contact between the cavity 11 and the Pin needle 30 to achieve a relative sealing of the cavity 11.

When welding, as shown in figure 9. Firstly, the Pin needle 30 to be welded is accommodated in the cavity 11, the vacuumizing part operates and exhausts the gas in the cavity 11 through the air channel to create a vacuum environment, and the Pin needle 30 is kept fixed with the welding head body 10 under the action of the difference between the internal pressure and the external pressure; then, the welding head body 10 drives the Pin needle 30 to move and position, and after the positioning is finished, the ultrasonic welding device transmits high-frequency vibration to the Pin needle 30 and the structure of a welding area through the welding head body 10 to carry out ultrasonic welding; after welding, the vacuumizing component injects gas into the cavity 11 through the air channel to eliminate vacuum and internal and external pressure difference, so that the Pin needle 30 and the welding head body 10 can be normally separated.

Secondly, the welding head body 10 can be fixed to the Pin needle 30 by adopting a friction clamping manner, as shown in fig. 3 to 5 of the drawings. The elastic ring 20 is arranged in the cavity 11 near the opening 111, when the Pin needle 30 is accommodated in the cavity 11, the elastic ring 20 is pressed, and the elastic ring 20 and the Pin needle 30 are mutually pressed and have a large friction force, so that the welding head body 10 and the Pin needle 30 are relatively fixed. In this structure, when the welding is completed, the Pin needle 30 is fixed to the corresponding welding area, and the welding head body 10 can be separated from the Pin needle 30 only by moving upward.

In one embodiment, the end surface of the bonding head body 10 is formed with a plurality of bonding grooves 102, and the portion of the end surface between the plurality of bonding grooves 102 forms a first bonding tooth 103.

The overall layout of the plurality of welding grooves 102 is in a net shape, and the first welding teeth 103 are in a grid shape.

Specifically, as shown in fig. 1, the end face of the bonding head body 10 has a mesh-like bonding groove 102 and a grid-like first bonding tooth 103 is formed, and the first bonding tooth 103 is used for increasing the pressure between the bonding head body 10 and the Pin 30 to be bonded and is embedded into the surface of the Pin 30 during super-soldering so as to stably transmit high-frequency vibration.

It should be noted that the overall shape of the lines formed by the plurality of welding grooves 102 and the shape of the first welding tooth 103 may be selectively set according to actual situations.

In one embodiment, the portion of the end surface near the opening 111 is located outside the distribution range of the weld recess 102, and the portion near the opening 111 is the second welding tooth 104 in a ring shape surrounding the opening 111.

Specifically, as shown in fig. 1, the distribution range of the weld groove 102 does not completely cover the end surface of the weld head body 10, the distribution area of the weld groove 102 is annular as a whole, and the portion of the end surface close to the opening 111 is located outside the distribution range of the weld groove 102 and has a complete circular ring shape surrounding the opening 111, which is the second weld tooth 104. The second welding tooth 104 functions to form an annular, relatively sealed contact surface at the periphery of the opening 111 when contacting the surface of the Pin needle 30. When the Pin needle 30 is fixed by the welding head body 10 in a vacuum suction manner, the second welding teeth 104 can ensure the sealing performance inside the cavity 11 relative to the outside, thereby ensuring the vacuum suction effect.

Preferably, the width of the second tooth 104 is 0.05-1 mm.

In one embodiment, the resilient ring 20 is a one-piece annular structure that extends circumferentially continuously along the inner wall of the cavity 11; or

The elastic ring 20 is a split ring structure composed of a plurality of parts circumferentially distributed along the inner wall of the cavity 11.

Specifically, in the scheme that the Pin needle 30 is fixed by the elastic ring 20 based on the welding head body 10, the elastic ring 20 may be a complete annular integrated structure, or a split structure composed of a plurality of mutually spaced parts, so as to meet different use requirements.

For example, if the Pin needle 30 has a cylindrical structure as shown in fig. 6 and 7, the elastic ring 20 may be formed in a single piece. However, if the Pin needle 30 has a square column structure as shown in fig. 8, the square elastic ring 20 having an integral structure is inconvenient to manufacture, and is more suitable to adopt a split structure.

The invention provides a Pin needle structure for ultrasonic welding of a Pin needle, which is applied to the welding head structure and comprises:

the connecting seat 31 is of a flat plate structure, and the connecting seat 31 is circular, square or other regular polygons;

the connecting body 32, the connecting body 32 is a solid column structure or a hollow tubular structure, and one end of the connecting body is fixed at the center of the connecting seat 31;

wherein, the connection body 32 can be accommodated in the cavity 11 on the welding head body 10 in the welding head structure, and when the connection body 32 is accommodated in the cavity 11, the surface of the connection seat 31 is in contact with the end surface of the welding head body 10.

Specifically, as shown in fig. 6 to 8 of the drawings, the Pin needle 30 includes two parts, namely a coupling seat 31 and a coupling body 32, and the whole body is in an inverted T shape. At the time of welding, the coupling body 32 is accommodated into the cavity 11 of the welding head body 10, and the surface of the coupling seat 31 is in contact with the end surface of the welding head body 10 for transmitting vibration, as shown in fig. 2 and 5 of the drawings. The shape of the coupling seat 31 is usually circular, square or other regular polygon, but may be other shapes according to the actual welding structure, but is generally regular. The coupling seat 31 is generally the same size as the end face of the corresponding bonding head body 10.

Preferably, the outer diameter of the coupling body 32 is 0.01-0.3mm smaller than the inner diameter of the cavity 11, and the length of the coupling body 32 is 0.5-5mm smaller than the length of the cavity 11.

Specifically, the coupling body 32 needs to be fixed in position after being accommodated in the cavity 11 without generating offset and shaking, so that the outer diameter of the coupling body 32 and the inner diameter of the cavity 11 should be limited. Theoretically, the outer diameter of the coupling body 32 is the same as the inner diameter of the cavity 11, but in practical applications, the ease and convenience of assembly and the roughness of the surfaces of the coupling body and the cavity are considered, so that the coupling body and the cavity are in clearance fit. The actual dimensions of the coupling member are such that the outer diameter of the coupling body 32 is 0.01-0.3mm smaller than the inner diameter of the cavity 11.

Meanwhile, the length of the cavity 11 needs to be greater than the length of the coupling body 32, and after the coupling body 32 is received in the cavity 11, a certain space exists in the cavity 11 to create a vacuum environment. Further, the length of the coupling body 32 is set to be 0.5 to 5mm smaller than the length of the cavity 11 in combination with the actual size and weight of the components, thereby satisfying the stability of the Pin needle 30 during vacuum suction.

Preferably, the thickness of the coupling seat 31 is 0.1-2 mm.

Preferably, the Pin needle structure is made of TU1 oxygen-free copper or TU2 oxygen-free copper, and the hardness of the Pin needle structure is 50-120 HV.

The invention provides a welding device for ultrasonic welding of a Pin needle, which comprises the welding head structure and further comprises:

a moving bracket 40, the moving bracket 40 being movable in a horizontal plane;

the connecting shaft 50 is vertically connected below the moving bracket 40, and the bottom tail end of the connecting shaft 50 is connected with the welding head body 10 in the welding head structure;

the bonding head body 10 can move along the connection shaft 50 and can rotate around the connection shaft 50.

Specifically, as shown in fig. 10, the welding device includes a moving bracket 40, a connecting shaft 50, and a welding head body 10, wherein the connecting shaft 50 is vertically disposed below the moving bracket 40, and the welding head body 10 is disposed at a bottom end of the connecting shaft 50. In the using process, the connecting shaft 50 and the welding head body 10 are driven to be assembled with the Pin needle 30 during moving, and the Pin needle 30 is driven to be positioned through moving. The bonding head body 10 can move up and down along the connection shaft 50 and rotate around the connection shaft 50. Wherein, the welding head body 10 can respectively realize the assembly and the separation with the Pin needle 30 by moving up and down along the connecting shaft 50; the rotation of the welding head body 10 around the connecting shaft 50 is performed by rotation instead of translation in the prior art, and the ultrasonic welding is performed by rotational friction.

It should be noted that the structure for driving the welding head body 10 to translate and rotate has a mature application in the prior art, and is not described herein again.

In one embodiment, a vacuum evacuation component is also included that communicates with the cavity 11 inside the bond head body 10 through a gas passage 101 inside the bond head body 10.

Specifically, a vacuum member (not shown in the drawings) is connected to the gas passage 101 inside the bonding head body 10 through a passage provided inside the connection shaft 50, and thereby connected to the cavity 11 inside the bonding head body 10.

The invention provides a welding method for ultrasonic welding of a Pin needle, which is applied to the welding device and comprises the following steps:

s1, conveying the Pin needle to a welding station;

s2, moving the welding head body of the welding device to the position above the Pin, descending the welding head body, and completely accommodating the connecting body 32 of the Pin in the cavity 11 inside the welding head body;

for the welding head body with an air channel inside, after the connecting body of the Pin needle is completely accommodated in the cavity, vacuum is formed in the cavity through a vacuumizing component so as to fix the Pin needle;

s3, horizontally moving the welding head body and driving the Pin needle to move to a preset welding position for ultrasonic welding;

s4, lifting the welding head body to be completely separated from the Pin, and horizontally moving for resetting;

for the welding head body with an air channel inside, before the welding head body rises to be completely separated from the Pin needle, gas is firstly introduced into the cavity to normal pressure or high pressure through the vacuumizing part.

Specifically, as shown in fig. 9 of the accompanying drawings, the welding process is as follows: firstly, the Pin needle 30 is fed to a welding station by a winding/vibrating disc or the like; then, the moving bracket 40 drives the welding head body 10 to move to the position above the Pin needle 30 to be welded, and the welding head body 10 descends along the connecting shaft 50 to be assembled with the Pin needle 30 and fixed relatively; then, the moving bracket 40 drives the welding head body 10 assembled with the Pin needle 30 to move to a preset welding area on a lining plate or a module fan, and welding positioning of the Pin needle 30 is carried out; then, the welding head body 10 positions the Pin needle 30 on a predetermined welding area and presses downward, the ultrasonic equipment is started, and meanwhile, the welding head body 10 rotates to weld; finally, after the welding is completed, the welding head body 10 stops rotating and rises along the connecting shaft 50 to be completely separated from the Pin needle 30, and moves and resets.

In the above welding process, for the welding head body 10 using the vacuum suction Pin needle 30, additional steps are required, that is: before driving the Pin needle 30 to move and position, the vacuum-pumping component is needed to vacuumize the cavity 11 so as to adsorb and fix the Pin needle 30; before moving and separating from the Pin needle 30, gas is injected into the cavity 11 to normal pressure or high pressure to eliminate the difference between the inside and outside pressure caused by vacuum. For the bonding head body 10 that fixes the Pin needle 30 using the elastic ring 20, the above-described additional steps are not required.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "bottom", "top", "front", "rear", "inner", "outer", "left", "right", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention.

Although the invention herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that features described in different dependent claims and herein may be combined in ways different from those described in the original claims. It is also to be understood that features described in connection with individual embodiments may be used in other described embodiments.