Welding head assembly

Abstract

The present invention aims to provide a welding head assembly, comprising an acoustic rod, a reed, a connecting member, and a welding nozzle unit. The acoustic rod, a first reed, a second reed, and the connecting member are an integrated unit; the acoustic rod and the welding nozzle unit are configured to form acoustic resonance; the welding nozzle unit is provided with at least one welding head working part, and the welding nozzle unit is detachably connected to an end face of the acoustic rod. The welding head assembly can reduce the use cost of the welding head while ensuring the wide application range of the welding head.

Description

A welding head assembly Technical Field

[0001] The present invention relates to the field of ultrasonic welding, and in particular to a welding head assembly. Background Art

[0002] Ultrasonic welding converts industrial frequency alternating current into high-frequency electrical energy through an ultrasonic generator. The converted high-frequency electrical energy is converted again into mechanical motion of the same frequency through a transducer. The mechanical motion is then transmitted to the welding head through a set of amplitude-changing rod devices that can change the amplitude. The welding head transmits the received vibration energy to the joint of the workpiece to be welded. In this area, the vibration energy is converted into heat energy through friction to achieve welding.

[0003] Figures 1 and 2 illustrate two existing ultrasonic horn configurations. Figure 1 shows a horn used in a lateral drive ultrasonic welding system, commonly referred to in the industry as a "horn horn horn." It includes a horn 902 and a transducer 904. When using a "horn horn horn" for welding, the horn 902, fixed to a frame 901, is cantilevered. Because the welding tip 903 at the end of the horn 902 is pressurized by the cantilever structure, the horn 902 is susceptible to bending moments, limiting the pressure applied by the tip 903. Figure 2 shows a horn used in a wedge-reed welding system, commonly referred to in the industry as a "wedge-reed horn." It includes a connector 911, a vertical reed 912, an acoustic rod 913, and a transducer 914. The reed 912 is fixedly connected to the welding machine via the connector 911. The lower end of the reed 912 serves as a working area 915 during welding. When using a wedge rod welding head for welding, the pressure on the working part 915 at the end of the pendulum rod 912 is applied by direct pressure through the vertical pendulum rod 912. Compared with the "ram horn welding head", it can apply very large pressure during the welding process without bending stress or pause. The pressure it transmits is limited by the crushing strength of the pendulum rod 912.

[0004] In order to enable the working part at the end of the rocker arm to be configured into a variety of configurations to meet different welding requirements and welding scenarios, the patent application with publication number CN215919399U records an integrated wedge rod welding head. However, the welding head of this configuration needs to be replaced as a whole after the trial life is reached, which is relatively costly.

[0005] Summary of the Invention

[0006] An object of the present invention is to provide a welding head assembly, which can ensure that the welding head has a wide range of applications while reducing the cost of using the welding head.

[0007] To achieve the aforementioned objectives, a welding head assembly is provided for ultrasonic welding, comprising an acoustic rod, a pendulum rod, and a connector. The acoustic rod has a first end and a second end, the first end being configured to connect to an amplitude modulator or a transducer. The pendulum rod is bifurcated near the second end by the acoustic rod into a first pendulum rod and a second pendulum rod. The first pendulum rod connects the acoustic rod and the connector. The acoustic rod, the first pendulum rod, the second pendulum rod, and the connector are integrally formed.

[0008] Wherein, the welding head assembly also includes a welding nozzle unit, the acoustic rod and the welding nozzle unit are configured to acoustically resonate, the welding nozzle unit has at least one welding head working part, and the welding nozzle unit is detachably connected to the second end face of the acoustic rod.

[0009] In one or more embodiments, after the welding nozzle unit is connected to the second end surface, the welding nozzle unit is separated from the rocker arm by a distance along the extension direction of the acoustic rod.

[0010] In one or more embodiments, the distance is no greater than 20 mm.

[0011] In one or more embodiments, the second end surface is provided with a boss, and the welding nozzle unit is detachably connected to the boss;

[0012] Wherein, the area of ​​the interface between the boss and the welding nozzle unit is smaller than the cross-sectional area of ​​the acoustic rod.

[0013] In one or more embodiments, in ultrasonic welding, when ultrasonic waves propagate on the first pendulum rod and the second pendulum rod, there is at least one node of the acoustic wave vibration mode on the first pendulum rod and the second pendulum rod respectively;

[0014] Wherein, the connection point between the connecting member and the first swing rod is located at the location of the node.

[0015] In one or more embodiments, during ultrasonic welding, when ultrasonic waves propagate on the first rocker, there are at least two nodes of the acoustic wave vibration shape on the first rocker.

[0016] In one or more embodiments, during ultrasonic welding, when ultrasonic waves propagate on the second rocker, a node of a sound wave vibration shape is present on the second rocker.

[0017] In one or more embodiments, the welding nozzle unit is of an axisymmetric configuration and has two welding head working parts. After the welding nozzle unit is connected to the second end face, the two welding head working parts are symmetrical about a horizontal plane.

[0018] When the ultrasonic wave propagates on the welding nozzle unit, there are an even number of nodes of the acoustic wave vibration mode on the welding nozzle unit.

[0019] In one or more embodiments, the welding nozzle unit has a welding head working part, and when the ultrasonic wave propagates on the welding nozzle unit, there is at least one node of the sound wave vibration mode on the welding nozzle unit.

[0020] In one or more embodiments, the connecting member is configured in a block shape, and the ultrasonic welding machine applies pressure to the welding head assembly through the connecting member to weld the workpiece at the working position of the welding head.

[0021] The beneficial effects of the present invention are:

[0022] 1) The welding head assembly of this configuration adopts the configuration of a "wedge rod type" welding head as a whole, which can achieve "near direct pressure" on the working part of the welding head, and can achieve greater pressure than the traditional "ram horn" welding head.

[0023] 2) By configuring the acoustic rod, first swing arm, second swing arm, and connector as an integral unit, the acoustic configurations of the acoustic rod, first swing arm, second swing arm, and connector as a whole and the detachably connected welding nozzle unit can be independently designed. This means that the acoustic configuration of the welding nozzle unit can be independently designed, allowing different configurations to be configured according to different welding scenarios to obtain different shapes and quantities of weld marks, ensuring a wide range of applicability for the welding head assembly. Furthermore, since the welding nozzle unit is detachable, after long-term wear and tear, only the welding nozzle unit needs to be disassembled and replaced, without having to replace the entire welding head assembly, thereby reducing the cost of using the welding head.

[0024] 3) By configuring the acoustic rod, the first rocker arm, the second rocker arm and the connecting piece as an integrated structure, the number of assembly parts of the welding head assembly is reduced, which can reduce the phenomenon of reduced welding quality of the welding head assembly due to assembly quality or damage to components during the later assembly process.

[0025] Summary of the Figures

[0026] The above and other features, properties and advantages of the present invention will become more apparent through the following description in conjunction with the accompanying drawings and embodiments, in which:

[0027] FIG1 shows a schematic diagram of a conventional welding head for a transversely driven welding system;

[0028] FIG2 shows a schematic diagram of a conventional welding head for a wedge-shaped pendulum welding system;

[0029] FIG3 shows a perspective schematic diagram of some embodiments of the welding head assembly;

[0030] FIG4 shows a front view of some embodiments of the welding head assembly;

[0031] FIG5 is a perspective schematic diagram showing some embodiments of the welding head assembly without the welding nozzle unit;

[0032] FIG6 shows a front view of the welding head assembly without the welding nozzle unit according to some embodiments of the present invention;

[0033] FIG7 shows a perspective schematic diagram of a welding nozzle unit according to some embodiments of the welding head assembly;

[0034] 8 and 9 schematically illustrate vibration modes generated when ultrasonic waves propagate on the acoustic rod, the first pendulum rod, and the second pendulum rod;

[0035] FIG10 schematically shows the vibration modes generated when ultrasonic waves propagate on the welding nozzle unit.

[0036] Specific embodiments of the present invention

[0037] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0039] In order to meet the requirements of a wide range of applications of the welding head while reducing the cost of using the welding head, a welding head assembly is provided according to some embodiments of the present application. Figure 3 shows a three-dimensional schematic diagram according to some embodiments of the welding head assembly, and Figure 4 shows a front schematic diagram according to some embodiments of the welding head assembly.

[0040] As shown in Figures 3 and 4, the welding head assembly includes an acoustic rod 1, a rocker arm 2, a connector 3, and a welding nozzle unit 4. The rocker arm 2 is bisected by the acoustic rod 1, thereby being divided into a first rocker arm 21 and a second rocker arm 22. The term "rocker arm 2 is bisected by the acoustic rod 1" herein means that the rocker arm 2 is separated from the acoustic rod 1, and the separated first rocker arm 21 and second rocker arm 22 are two independent acoustic configurations. Their configurations are unaffected by each other, and their acoustic configurations can be designed independently during the design process.

[0041] The acoustic rod 1 has a first end 11 and a second end 12. The first end 11 is used to connect to an amplitude modulator or transducer. Figures 8 and 9 schematically illustrate the vibration modes generated when ultrasonic waves propagate through the acoustic rod 1, the first pendulum 21, and the second pendulum 22. The dashed curve 5 shows the vibration modes generated when ultrasonic waves propagate through the acoustic rod 1. The vibration mode diagram shows that ultrasonic vibrations are transmitted from the first end 11 to the second end 12 along the extension direction a (i.e., the axial direction) of the acoustic rod 1. The length of the acoustic rod 1 is configured such that when ultrasonic waves propagate through the acoustic rod 1, they have an integer multiple of half-wavelengths. In the embodiment shown in the figure, the ultrasonic waves propagate through the acoustic rod 1 for a half-wavelength, resulting in a node 50 on the acoustic rod 1. A node, also known as a modal node, is a location where the vibration amplitude is close to zero. In other suitable embodiments, the node can be N half-wavelengths (N is an integer such as 2, 3, 4, 5, etc.).

[0042] The rocker arm 2 is divided into two parts by the acoustic rod 1 near the second end 12. Specifically, the split first rocker arm 21 is connected to the acoustic rod 1 and the connector 3 near the second end 12, as shown in the figure. Correspondingly, the second rocker arm 22 is also connected to the acoustic rod 1 near the second end 12. As can be seen from the figure, "near the second end 12" means that the first and second rocker arms 21 and 22 are close to, but do not protrude from, the end surfaces of the acoustic rod 1 at the second end 12 after being connected to the acoustic rod 1.

[0043] The acoustic rod 1, the first rocker arm 21, the second rocker arm 22 and the connecting member 3 are an integral part. It can be understood that the acoustic rod 1, the first rocker arm 21, the second rocker arm 22 and the connecting member 3 are an integral part, which means that the acoustic rod 1, the first rocker arm 21, the second rocker arm 22 and the connecting member 3 are made of the same blank or raw material and are an integrated structure formed by an integrated molding process including but not limited to machining, casting or additive manufacturing.

[0044] On this basis, the welding nozzle unit 4 has at least one welding head working portion 40. It can be understood that in the direction shown in Figures 3 and 4, the upper and lower ends of the welding nozzle unit 4 are configured as the welding head working portion 40, which serves as the portion that contacts the joint portion of the workpiece to be welded during the ultrasonic welding process. The welding nozzle unit 4 is detachably connected to the end face of the second end 12 of the acoustic rod 1, and the acoustic rod 1 and the welding nozzle unit 4 are configured to acoustically resonate, so that during the ultrasonic welding process, ultrasonic vibrations can be transmitted from the acoustic rod 1 to the welding nozzle unit 4 to achieve ultrasonic welding. As shown in Figure 8, the dotted line curve 6 shows the vibration mode generated when ultrasonic waves propagate on the welding nozzle unit 4. The acoustic rod 1 and the welding nozzle unit 4 are configured to acoustically resonate means that the frequency of the acoustic rod 1 under the acoustic wave vibration mode shown by the dashed line curve 5 is consistent with or close to the frequency of the welding nozzle unit 4 under the acoustic wave vibration mode shown by the dotted line curve 6.

[0045] During the ultrasonic welding process, the configuration shown in the existing Figure 2 can be referred to. In the assembled state, the connector 3 and at least one welding head working part 40 of the welding nozzle unit 4 are located on both sides of the axial direction of the welding head assembly. The welding head assembly is connected to the amplitude modulator or transducer through the acoustic rod 1, and is connected to the ultrasonic welder through the connector 3. The ultrasonic welder applies downward pressure to the welding head assembly through the connector 3, which is transmitted to the welding head working part 40 of the welding nozzle unit 4 through the rocker rod 2, thereby realizing "near direct pressure" on the welding head working part 40.

[0046] The welding head assembly with the above-mentioned configuration firstly adopts the configuration of a "wedge rod type" welding head as a whole, which can achieve "near direct pressure" on the working part 40 of the welding head, and can obtain greater pressure than the traditional "ram horn" welding head.

[0047] At the same time, by configuring the acoustic rod 1, the first swing arm 21, the second swing arm 22, and the connecting member 3 as an integral part, the acoustic configurations of the acoustic rod 1, the first swing arm 21, the second swing arm 22, and the connecting member 3 as a whole and the detachably connected welding nozzle unit 4 can be independently designed. That is, the acoustic configuration of the welding nozzle unit 4 can be independently designed, and thus different configurations can be configured according to different welding scenarios to obtain different shapes and quantities of weld marks, ensuring a wide range of applicability of the welding head assembly. On this basis, because the welding nozzle unit 4 is detachable, after long-term use and wear, only the welding nozzle unit 4 needs to be disassembled and replaced, without replacing the entire welding head assembly, thereby reducing the cost of using the welding head.

[0048] Finally, by configuring the acoustic rod 1, the first rocker arm 21, the second rocker arm 22 and the connecting member 3 as an integrated structure, the number of assembly parts of the welding head assembly is reduced, which can reduce the phenomenon of reduced welding quality of the welding head assembly due to assembly quality or damage to components during the later assembly process.

[0049] In the description of the embodiments of the present application, the technical terms "first" and "second", such as "first rocker arm" and "second rocker arm", are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary and secondary relationship of the indicated technical features.

[0050] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0051] As shown in Figures 3 and 4 , in one or more embodiments of the welding head assembly, after the welding nozzle unit 4 is connected to the end surface of the second end 12 of the acoustic rod 1, a distance x is separated from the welding nozzle unit 4 and the rocker 2 along the extension direction a of the acoustic rod 1. That is, as shown in the figures, a distance x is separated from the welding nozzle unit 4 and both the first rocker 21 and the second rocker 22 along the extension direction a of the acoustic rod 1. This design prevents interference between the welding nozzle unit 4 and the rocker 2 during the ultrasonic welding process after assembly.

[0052] Furthermore, in one or more embodiments of the present welding head assembly, the distance x between the welding nozzle unit 4 and the rocker arm 2 at one end is not greater than 20 mm. The spacing distance within this range can ensure that there will be no interference between the welding nozzle unit 4 and the rocker arm 2, and ensure that the welding nozzle unit 4 will not be too far away from the rocker arm 2, resulting in the center axis of the welding nozzle unit 4 and the center axis of the rocker arm 2 and the connecting member 3 connected thereto being too far apart along the extension direction a of the acoustic rod 1, thereby causing unnecessary bending moment to be generated on the welding nozzle unit 4 itself when pressure is applied from the connecting member 3.

[0053] FIG5 shows a perspective schematic diagram of some embodiments of the welding head assembly without the welding nozzle unit, and FIG6 shows a front schematic diagram of some embodiments of the welding head assembly without the welding nozzle unit. In one or more embodiments of the welding head assembly, a boss 13 is provided on the end face of the second end 12 of the acoustic rod 1, and the welding nozzle unit 4 is detachably connected to the boss 13, that is, in the assembled state, the welding nozzle unit 4 is in contact with the surface of the boss 13. The area of ​​the interface between the boss 13 and the welding nozzle unit 4 is smaller than the cross-sectional area of ​​the acoustic rod 1. Configuring the welding head assembly with the aforementioned configuration allows the welding nozzle unit 4 to have a smaller contact area with the boss 13 than when it is directly mounted on the end face of the acoustic rod 1. As a result, the welding nozzle unit 4 is less constrained by the acoustic rod, which not only improves the transmission effect of acoustic vibrations but also increases the design space of the welding nozzle unit 4.

[0054] In one or more embodiments of the welding head assembly, referring to Figures 8 and 9 , dashed-dotted curve 7 illustrates the vibration mode generated when ultrasonic waves propagate on the pendulum 2. During ultrasonic welding, when ultrasonic waves propagate on the first pendulum 21 and the second pendulum 22, at least one acoustic vibration mode node 70 is present on each of the first pendulum 21 and the second pendulum 22. The junction between the connector 3 and the first pendulum 21 is located at the node 70. By arranging the junction between the connector 3 and the first pendulum 21 at the node 70, the vibration of the connector 3 during the welding process can be significantly attenuated.

[0055] In one or more embodiments of the present welding head assembly, please continue to refer to Figures 8 and 9. During ultrasonic welding, when ultrasonic waves propagate on the first rocker arm 21, there are at least two nodes 70 of the acoustic wave vibration mode on the first rocker arm 21. For example, in the embodiment shown in the figure, there are two nodes 70 of the acoustic wave vibration mode on the first rocker arm 21. Such a configuration can make the connection between the first rocker arm 21 and the connecting member 3 away from the upper end of the welding nozzle unit 4, and the first rocker arm 21 has sufficient length to avoid interference between the welding nozzle unit 4 and the connecting member 3.

[0056] In one or more embodiments of the present welding head assembly, please continue to refer to Figures 8 and 9. In ultrasonic welding, when the ultrasonic wave propagates on the second rocker arm 22, there is a node 70 of the acoustic wave vibration mode on the second rocker arm 22. If the length of the second rocker arm 22 is too long, it may affect the welding space and range of the welding nozzle unit 4. Since the acoustic rod 1, the first rocker arm 21, the second rocker arm 22 and the connecting member 3 are configured as an integrated structure, the second rocker arm 22 can be designed relatively independently, so that only one acoustic wave vibration mode node 70 can be set on the second rocker arm 22, which can avoid interference with the welding nozzle unit 4 due to the excessive length of the second rocker arm 22.

[0057] Figure 7 shows a perspective schematic diagram of a welding nozzle unit according to some embodiments of the present welding head assembly, and Figure 10 schematically illustrates the vibration modes generated when ultrasonic waves propagate through the welding nozzle unit. In one or more embodiments of the present welding head assembly, the welding nozzle unit 4 is axisymmetric and has two welding nozzle working portions 40. After the welding nozzle unit 4 is connected to the second end 12 of the acoustic rod 1, the two welding nozzle working portions 40 are symmetrical about the horizontal plane. In this embodiment, as shown by the dot-dash curve 6, when ultrasonic waves propagate through the welding nozzle unit 4, an even number of nodes 60 of the acoustic mode are generated on the welding nozzle unit 4. During welding, the connection between the welding nozzle unit 4 and the acoustic rod 1 can be changed so that the welding nozzle working portion 40 located at the upper end face can be rotated to face the lower end face. This allows the welding nozzle unit 4 to replace the welding nozzle working portion 40 without replacing the welding nozzle unit 4 by changing the connection state of the welding nozzle unit 4, further reducing the cost of the welding head. In other suitable embodiments, the number of welding head working parts 40 may be three or more. Correspondingly, the welding nozzle unit 4 may have a corresponding number of connection postures with the acoustic rod 1. By adjusting the connection posture between the welding nozzle unit 4 and the acoustic rod 1, multiple welding head working parts 40 can be brought into the welding position for welding without replacing the welding nozzle unit 4. In a traditional "wedge rod welding head", the welding head has only one working part. However, by providing a welding head assembly with this configuration, the welding nozzle assembly 4 can have two or more welding head working parts 40. Under the premise of ensuring that the welding head assembly as a whole has the "wedge rod welding head" configuration, the cost of using the welding head is reduced.

[0058] In one or more embodiments of the welding head assembly, the welding nozzle unit 4 has a pair of first connection holes 41, and the boss 13 on the second end surface of the acoustic rod 1 has a pair of second connection holes 14. By aligning the pair of first connection holes 41 with the pair of second connection holes 14, the welding nozzle unit 4 can be removably connected to the acoustic rod 1 using fasteners such as bolts. In other suitable embodiments, the welding nozzle unit 4 and the acoustic rod 1 can also be removably connected using, for example, multiple bolts or a suitable snap-fit ​​structure.

[0059] In one or more embodiments of the present welding head assembly, the welding nozzle unit 4 may be different from that shown in the figure and may have only one welding head working part. When ultrasonic waves propagate on the welding nozzle unit 4, there is at least one node of the sound wave vibration mode on the welding nozzle unit.

[0060] In one or more embodiments of the present welding head assembly, the connecting member 3 is configured as a block as shown in the figure, i.e., a connecting block provided at the end of the first swing arm 21. The ultrasonic welding machine applies pressure to the welding head assembly through the connecting member 3 to weld the workpiece at the welding head working portion 40. For example, the connecting member 3 may be a square structure as shown in the figure, a square block structure with a wedge structure, a connecting structure with a hole, or other suitable clamping connecting structure.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A welding head assembly for ultrasonic welding, characterized in that: The invention comprises an acoustic rod, a swing rod and a connecting member, wherein the acoustic rod has a first end and a second end, the first end is used to connect to an amplitude modulator or a transducer, the swing rod is divided into two parts near the second end by the acoustic rod, and is divided into a first swing rod and a second swing rod, the first swing rod connects the acoustic rod and the connecting member, and the acoustic rod, the first swing rod, the second swing rod and the connecting member are an integrated part; Wherein, the welding head assembly also includes a welding nozzle unit, the acoustic rod and the welding nozzle unit are configured to acoustically resonate, the welding nozzle unit has at least one welding head working part, and the welding nozzle unit is detachably connected to the second end face of the acoustic rod.

2. The welding head assembly according to claim 1, characterized in that: After the welding nozzle unit is connected to the second end surface, the welding nozzle unit is separated from the swing rod by a distance along the extension direction of the acoustic rod.

3. The welding head assembly according to claim 2, characterized in that: The distance is no greater than 20 mm.

4. The welding head assembly according to any one of claims 1 to 3, characterized in that: The second end surface is provided with a boss, and the welding nozzle unit is detachably connected to the boss; Wherein, the area of ​​the interface between the boss and the welding nozzle unit is smaller than the cross-sectional area of ​​the acoustic rod.

5. The welding head assembly according to any one of claims 1 to 3, characterized in that: In ultrasonic welding, when ultrasonic waves propagate on the first swing rod and the second swing rod, there is at least one node of the acoustic wave vibration mode on the first swing rod and the second swing rod respectively; Wherein, the connection point between the connecting member and the first swing rod is located at the location of the node.

6. The welding head assembly according to claim 5, characterized in that: In ultrasonic welding, when ultrasonic waves propagate on the first rocker, there are at least two nodes of the acoustic wave vibration mode on the first rocker.

7. The welding head assembly according to claim 5, characterized in that: In ultrasonic welding, when ultrasonic waves propagate on the second rocker, a node of a sound wave vibration shape is present on the second rocker.

8. The welding head assembly according to any one of claims 1 to 3, characterized in that: The welding nozzle unit is of an axisymmetric configuration and has two welding head working parts. After the welding nozzle unit is connected to the second end surface, the two welding head working parts are symmetrical about a horizontal plane; When the ultrasonic wave propagates on the welding nozzle unit, there are an even number of nodes of the sound wave vibration mode on the welding nozzle unit.

9. The welding head assembly according to any one of claims 1 to 3, characterized in that: The welding nozzle unit has a welding head working part, and when ultrasonic waves propagate on the welding nozzle unit, there is at least one node of the sound wave vibration mode on the welding nozzle unit.

10. The welding head assembly according to any one of claims 1 to 3, characterized in that: The connecting piece is configured in a block shape, and the ultrasonic welding machine applies a pressure to the welding head assembly through the connecting piece to weld the workpiece at the working position of the welding head.

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