Ultrasonic welding machine and welding head assembly

Abstract

The invention aims to provide the welding head assembly which can meet different welding requirements. In order to achieve the purpose, the welding head assembly is used for ultrasonic welding and comprises an acoustic rod, a swing rod and a connecting piece, the swing rod is divided into a first swing rod and a second swing rod by the acoustic rod, the first swing rod is connected with the acoustic rod and the connecting piece, one end of the second swing rod is connected with the acoustic rod, and the other end of the second swing rod is configured to be a welding head working part; wherein the acoustic rod, the first swing rod and the connecting piece are an integrated piece, and during ultrasonic welding, when ultrasonic waves are transmitted on the first swing rod and the second swing rod, at least one sound wave vibration mode node is arranged on the first swing rod and the second swing rod respectively; the joint of the connecting piece and the first swing rod is the position where a node is located. The invention further provides an ultrasonic welding machine.

Description

[0001] This invention patent application is a divisional application of the invention patent application with application number 202110926750.1, application date August 12, 2021, and name “A welding head assembly”. Technical Field

[0002] The invention relates to the field of ultrasonic welding, and in particular to a welding head assembly. Background Art

[0003] Ultrasonic welding is a process in which an ultrasonic generator converts industrial frequency alternating current into high-frequency electrical energy. 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.

[0004] like Figure 1 A schematic diagram of an existing welding head assembly is shown, wherein the welding head assembly 9 is formed by connecting a connecting portion 91, a welding head component 92, a first component 93 and a second component 94, wherein the first component 93 and the second component 94 are connected to both sides of the welding head component 92, usually by opening a hole in the welding head component 92, and the first component 93 and the second component 94 are respectively connected by bolts after passing through the holes, and the connected first component 93 and the second component 94 are symmetrical relative to the center of the welding head component 92.

[0005] However, the inventors discovered that in order for the welding head assembly to meet the acoustic requirements and for the first component 93 and the second component 94 to be connectable, the welding head component 92 in the existing welding head assembly needs to ensure a thinner distance between the first component 93 and the second component 94, thereby limiting the structural changes of the welding head component 92, resulting in limited changes to the welding head assembly.

[0006] Therefore, there is an urgent need to provide a welding head assembly that can meet different welding requirements. Summary of the invention

[0007] An object of the present invention is to provide a welding head assembly which can meet different welding requirements.

[0008] A welding head assembly for achieving the above-mentioned purpose is used for ultrasonic welding, comprising an acoustic rod, a swing rod and a connecting piece, wherein the swing rod is divided into two parts by the acoustic rod, namely a first swing rod and a second swing rod, the first swing rod connects the acoustic rod and the connecting piece, one end of the second swing rod is connected to the acoustic rod, and the other end is configured as a welding head working part;

[0009] Wherein, the acoustic rod, the first swing rod and the connecting member are an integrated part.

[0010] In one or more embodiments, the second rocker arm is also integral with the acoustic rod, the first rocker arm and the connecting member.

[0011] In one or more embodiments, 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 shape on the first swing rod and the second swing rod respectively;

[0012] Wherein, the connection point between the connecting member and the first swing rod is located at the location of the node.

[0013] In one or more embodiments, the acoustic rod extends along a first length direction, which is the same as the propagation direction of the ultrasonic wave on the acoustic rod during ultrasonic welding, and the first swing rod and the second swing rod extend along a second length direction respectively, which is perpendicular to the second length direction.

[0014] Wherein, the first swing rod and the second swing rod have different lengths in the second length direction.

[0015] In one or more embodiments, the first swing arm and the second swing arm have the same length in the second length direction.

[0016] In one or more embodiments, the first swing arm and / or the second swing arm has a variable cross-section structure along the second length direction.

[0017] In one or more embodiments, in a cross section of the welding head working part, the width of the welding head working part is greater than or equal to the thickness of the welding head working part.

[0018] In one or more embodiments, in a cross section of the welding head working portion, a width of the welding head working portion is smaller than a thickness of the welding head working portion.

[0019] In one or more embodiments, in a cross section of the first rocker arm, a width of the first rocker arm is smaller than a thickness of the first rocker arm.

[0020] In one or more embodiments, in a cross section of the first rocker arm, a width of the first rocker arm is greater than or equal to a thickness of the first rocker arm.

[0021] The improved effects of the present invention include one or a combination of the following:

[0022] In the present welding head assembly, by configuring the acoustic rod, the first rocker arm and the connecting piece into an integral part, it is possible to ensure that the welding head assembly has good welding quality. At the same time, the rocker arm is divided into two parts by the acoustic rod, so that the configuration of the second rocker arm is not affected by the first rocker arm. Regardless of whether it is configured as an integral part together with the acoustic rod, the first rocker arm and the connecting piece, or is manufactured separately and then connected, the second rocker arm and the welding head working part at one end thereof can be configured into a variety of configurations. This allows the welding head to meet different welding requirements and welding scenarios while ensuring the acoustic performance and welding quality, thereby improving the scope of application of the applied ultrasonic welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] 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:

[0024] Figure 1 A schematic diagram of a conventional welding head assembly is shown;

[0025] Figure 2 A three-dimensional schematic diagram of a first embodiment of the welding head assembly is shown;

[0026] Figure 3 A front view schematic diagram of a first embodiment of the welding head assembly is shown;

[0027] Figure 4 A three-dimensional schematic diagram of a second embodiment of the welding head assembly is shown;

[0028] Figure 5 A front view schematic diagram of a second embodiment of the welding head assembly is shown;

[0029] Figure 6 A three-dimensional schematic diagram of a third embodiment of the welding head assembly is shown;

[0030] Figure 7 A three-dimensional schematic diagram of a fourth embodiment of the welding head assembly is shown;

[0031] Figure 8 A three-dimensional schematic diagram of a fifth embodiment of the welding head assembly is shown;

[0032] Fig. 9 A three-dimensional schematic diagram of a sixth embodiment of the welding head assembly is shown;

[0033] Fig.10 A perspective schematic diagram of a seventh embodiment of the welding head assembly is shown;

[0034] Fig.11 A three-dimensional schematic diagram of an eighth embodiment of the welding head assembly is shown. DETAILED DESCRIPTION

[0035] The following discloses a variety of different implementation methods or embodiments of the subject technical solution. To simplify the disclosure, specific examples of each element and arrangement are described below. Of course, these are only examples and are not intended to limit the scope of protection of this application. In addition, the disclosure may repeat the figure numerals and / or letters in different examples. This repetition is for brevity and clarity and does not in itself represent the relationship between the various embodiments and / or structures to be discussed.

[0036] At the same time, the present application uses specific words to describe the embodiments of the present application, such as "one embodiment", "an embodiment", and / or "some embodiments" refer to a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" mentioned twice or more in different locations in this specification does not necessarily refer to the same embodiment. In addition, certain features, structures or characteristics in one or more embodiments of the present application may be appropriately combined. In addition, the use of words such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of the present application.

[0037] It should be noted that, in the case of use, the upper, lower, and bottom in the following description are only used for convenience and do not imply any specific fixed direction. In fact, they are used to reflect the relative position and / or direction between the various parts of the object.

[0038] It should be noted that these and other subsequent drawings are only examples, are not drawn in accordance with the conditions of equal proportion, and should not be used as a limitation on the actual protection scope of the present invention. In addition, the transformation methods under different embodiments can be appropriately combined.

[0039] In order to provide a welding head that can meet different welding requirements, one aspect of the present invention provides a welding head assembly for ultrasonic welding, such as Figure 2 FIG. 1 shows a three-dimensional schematic diagram of a first embodiment of the welding head assembly. Figure 3 A front schematic diagram of the first embodiment of the welding head assembly is shown.

[0040] like Figure 2 As shown, the welding head assembly for ultrasonic welding includes an acoustic rod 1, a swing rod 2 and a connecting member 3. The swing rod 2 is divided into two by the acoustic rod 1, and is divided into a first swing rod 21 and a second swing rod 22 by the acoustic rod 1. The division into two here means that the swing rod 2 is separated from the acoustic rod 1, so that the first swing rod 21 and the second swing rod 22 become two independent components.

[0041] The acoustic rod 1 is a part of the welding head assembly. The ultrasonic vibration is along its axial direction. Its cross section can be circular, square or other shapes. In order to adjust the amplitude, its cross section can also be a variable cross section structure.

[0042] The two ends of the first swing rod 21 are respectively connected to the acoustic rod 1 and the connecting member 3, one end of the second swing rod 22 is connected to the acoustic rod 1, and the other end is configured as a welding head working part 220. It can be understood that in the direction shown in the figure, the upper end of the second swing rod 22 is connected to the acoustic rod 1, and the lower end is configured as the welding head working part 220, which acts as a part that contacts the joint part of the workpiece to be welded during the ultrasonic welding process.

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

[0044] In the conventional welding head, the acoustic rod 1, the first swing rod 21 and the connecting member 3 are connected and formed by welding. Due to the high temperature used in the welding process or the pores and cracks generated during welding, the welding head formed by the acoustic rod 1, the first swing rod 21 and the connecting member 3 connected by welding may be deformed as a whole or the welding head quality and welding performance may be reduced due to defects. In other conventional welding heads, the acoustic rod 1, the first swing rod 21 and the connecting member 3 are connected by fasteners, which may also lead to the reduction of welding head quality and welding performance due to problems such as assembly quality and precision. At the same time, the connection method by fasteners also limits the outer contour configuration of the swing rod and / or the acoustic rod.

[0045] By configuring the acoustic rod 1, the first swing arm 21 and the connecting member 3 as an integral part, it is possible to reduce the phenomenon that the welding quality of the welding head assembly is reduced due to assembly quality or damage to components during the later assembly process.

[0046] Furthermore, on the basis of the aforementioned embodiment, the second rocker arm 22 can also be an integral part manufactured together with the acoustic rod 1, the first rocker arm 21 and the connecting part 3 through an integrated molding process. Similarly, the aforementioned integrated part means that the second rocker arm 22 and the acoustic rod 1, the first rocker arm 21 and the connecting part 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.

[0047] Of course, in the embodiment where the second swing arm 22 is not integrally formed with other components, the second swing arm 22 may also be a separately manufactured component connected by means of fastener connection, welding, or the like.

[0048] The embodiment of integrally forming the second swing arm 22 with the acoustic rod 1, the first swing arm 21 and the connecting piece 3 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] Correspondingly, the second rocker arm 22 is manufactured separately and then connected to the acoustic rod 1, the first rocker arm 21 and the connecting member 3. This can meet different welding requirements and welding scenarios by simply replacing the second rocker arm 22 with a different configuration, thereby reducing the cost of equipment production.

[0050] It can be understood that no matter in the embodiment in which the second rocker arm 22 is integrally formed with the acoustic rod 1, the first rocker arm 21 and the connecting member 3, or in the embodiment in which the second rocker arm 22 is manufactured separately and then connected to the acoustic rod 1, the first rocker arm 21 and the connecting member 3, by configuring the acoustic rod 1, the first rocker arm 21 and the connecting member 3 as an integral part, it is possible to ensure that the welding head assembly has good welding quality while enabling the second rocker arm 22 and the welding head working part 220 at one end thereof to be configured into a variety of configurations, so that the welding head working part can meet different welding requirements and welding scenarios, and can improve the scope of application of the applied ultrasonic welding. One or more configuration changes of the welding head assembly will be further described in detail later.

[0051] Continue back to Figures 2 to 3 The first embodiment of the welding head assembly shown, Figure 3 The figure schematically shows the vibration modes generated when the ultrasonic wave propagates on the acoustic rod 1, the first swing rod 21 and the second swing rod 22. The dashed curve 4 shows the vibration modes generated when the ultrasonic wave propagates on the acoustic rod 1, and the dotted curve 5 shows the vibration modes generated when the ultrasonic wave propagates on the first swing rod 21 and the second swing rod 22. As shown in the dotted curve 5 structure in the figure, when the ultrasonic wave propagates on the first swing rod 21 and the second swing rod 22, there are two nodes 6 of the acoustic wave vibration mode on the first swing rod, and there are also two nodes 6 of the acoustic wave vibration mode on the second swing rod, and the junction of the connector 3 and the first swing rod 21 is located at the location of the node 6. The node, also known as the modal node, refers to the position where the vibration amplitude is close to zero, that is, in the vibration mode animation, the stationary point is the node. By setting the junction of the connector 3 and the first swing rod 21 to be located at the location of the node 6, the vibration of the connector 3 during the welding process can be greatly attenuated.

[0052] Furthermore, if Figures 2 to 3 In the first embodiment of the welding head assembly shown, the acoustic rod 1 extends along a first length direction a, which is the same as the propagation direction of ultrasonic waves on the acoustic rod in ultrasonic welding. The first rocker arm 21 and the second rocker arm 22 extend along a second length direction b, respectively, and the first length direction a is perpendicular to the second length direction b, so that the first rocker arm 21 and the second rocker arm 22 are respectively connected to both sides of the acoustic rod 1.

[0053] The first swing arm 21 has a width c1 and a thickness d1 , and the welding head working portion 220 of the second swing arm 22 has a width e1 and a thickness f1 .

[0054] Among them, in this first embodiment, if Figure 2 As shown, the first swing rod 21 has a variable cross-sectional configuration along the second length direction b. Specifically, a section where the first swing rod 21 and the connecting member 3 meet has an inward-contracted, smaller cross-sectional area as shown in the figure. The cross-sectional configuration of the second swing rod 22 along the second length direction b remains unchanged. In the cross section of the first swing rod 21, the width c1 of the first swing rod 21 is smaller than the thickness d1, so that a transverse swing rod configuration can be obtained. In the cross section at the welding head working part 220 of the second swing rod 22, the width e1 of the welding head working part 220 is also smaller than the thickness f1, so that the second swing rod 22 has a transverse swing rod configuration. At this time, the welding head is called a transverse welding head. By configuring the acoustic rod 1, the first swing rod 21 and the connecting member 3 as an integral part, the welding head assembly can obtain a configuration in which a transverse upper swing rod and a transverse lower swing rod are combined. The welding head assembly with this configuration is particularly suitable for transverse welding occasions where the transverse space of the upper swing rod is not limited and the lower swing rod needs a larger avoidance.

[0055] Furthermore, in one or more embodiments, the acoustic rod 1 has a center line m, and the distance from the upper end surface of the integrated welding head to the center line m is h1, and the size of h1 is between 143 and 148 mm. It has been verified that making the size of h1 within the above range can achieve better acoustic performance.

[0056] Further, in one or more embodiments, the distance from the lower end surface of the integrated welding head to the center line m is h2, and the size of h2 is between 79 and 87 mm. It has been verified that making the size of h2 within the above range can achieve better acoustic performance.

[0057] In one or more embodiments, the size of h2 is between 43 and 63 mm. It has been verified that better acoustic performance can be achieved when the size of h2 is within the above range.

[0058] In one or more embodiments, the acoustic rod 1 has an outer diameter or thickness h, and h is between 36 and 42 mm. It has been verified that better acoustic performance can be achieved when the size of h is within the above range.

[0059] Second embodiment

[0060] Based on the first embodiment, the second embodiment has various changes as described below. These changes are described in detail below.

[0061] like Figure 4 FIG. 2 shows a three-dimensional schematic diagram of a second embodiment of the welding head assembly. Figure 5 A front schematic diagram of a second embodiment of the welding head assembly is shown.

[0062] Figure 5 In FIG. 4 , the dashed curve 4a shows the vibration mode generated when the ultrasonic wave propagates on the acoustic rod 1a, and the dotted curve 5a shows the vibration mode generated when the ultrasonic wave propagates on the first swing rod 21a and the second swing rod 22a. Figure 5 In the structure of the dot-dash curve 5a shown in FIG, when the ultrasonic wave propagates on the first rocker 21a and the second rocker 22a, there are two nodes 6a of the acoustic vibration mode on the first rocker 21a and one node 6a of the acoustic vibration mode on the second rocker 22a.

[0063] like Figure 4 The first swing rod 21a and the second swing rod 22a have different lengths in the second length direction b, wherein the length of the second swing rod 22a is less than the length of the first swing rod 21a. By configuring the acoustic rod, the first swing rod and the connecting member as an integral part, the welding head assembly can be formed into a configuration with an upper swing rod and a lower swing rod of different lengths. The welding head assembly with this configuration is particularly suitable for horizontal welding occasions where the lateral space of the upper swing rod is not limited and the lower swing rod does not need a large avoidance.

[0064] Third embodiment

[0065] Based on the first embodiment, the third embodiment has various changes as described below. These changes are described in detail below.

[0066] Figure 6 A three-dimensional schematic diagram of the third embodiment of the welding head assembly is shown, the first swing arm 21b has a width c3 and a thickness d3, and the welding head working part 220b of the second swing arm 22b has a width e3 and a thickness f3.

[0067] In the third embodiment, in the cross section of the first swing arm 21b, the width c3 of the first swing arm 21b is greater than the thickness d3, so that a longitudinal swing arm configuration can be obtained. In the cross section of the welding head working part 220b of the second swing arm 22b, the width e3 of the welding head working part 220b is less than the thickness f3, so that the second swing arm 22b is in a transverse swing arm configuration, and the welding head is also a transverse welding head. By configuring the acoustic rod, the first swing arm and the connecting member into an integral part, the welding head assembly can form a configuration combining a longitudinal upper swing arm and a transverse welding head. The welding head assembly with this configuration is particularly suitable for transverse welding occasions where the transverse space of the upper swing arm is limited and the lower swing arm needs a large avoidance.

[0068] Fourth embodiment

[0069] Based on the third embodiment, the fourth embodiment has various changes as described below. These changes are described in detail below.

[0070] Figure 7 The 3D schematic diagram of the fourth embodiment of the welding head assembly is shown, and the first swing rod 21c and the second swing rod 22c have different lengths in the second length direction b, wherein the length of the second swing rod 22c is less than the length of the first swing rod 21c. By configuring the acoustic rod, the first swing rod and the connecting member as an integral part, the welding head assembly can obtain a configuration with an upper swing rod and a lower swing rod of different lengths on the basis of obtaining a configuration combining a longitudinal upper swing rod with a transverse welding head. The welding head assembly with this configuration is particularly suitable for transverse welding occasions where the transverse space of the upper swing rod is limited and the lower swing rod does not need a large avoidance.

[0071] Fifth embodiment

[0072] Based on the first embodiment, the fifth embodiment has various changes as described below. These changes are described in detail below.

[0073] Figure 8 A three-dimensional schematic diagram of the fifth embodiment of the welding head assembly is shown, in which the first swing arm 21d has a width c5 and a thickness d5, and the welding head working part 220d of the second swing arm 22d has a width e5 and a thickness f5.

[0074] In the fifth embodiment, in the cross section of the first swing arm 21d, the width c5 of the first swing arm 21d is greater than the thickness d5, so that a longitudinal swing arm configuration can be obtained. In the cross section of the welding head working part 220d of the second swing arm 22d, the width e5 of the welding head working part 220d is greater than the thickness f5, so that the second swing arm 22d also presents a longitudinal swing arm configuration, and the welding head is a longitudinal welding head at this time. By configuring the acoustic rod, the first swing arm and the connecting member into an integral part, the welding head assembly can form a configuration in which the longitudinal upper swing arm and the longitudinal welding head are combined. The welding head assembly with this configuration is particularly suitable for longitudinal welding occasions where the longitudinal space of the upper swing arm is not limited and the lower swing arm needs a large avoidance.

[0075] Sixth Embodiment

[0076] Based on the fifth embodiment, the sixth embodiment has various changes as described below. These changes are described in detail below.

[0077] Fig. 9 The 3D schematic diagram of the sixth embodiment of the welding head assembly is shown, and the first swing rod 21e and the second swing rod 22e have different lengths in the second length direction b, wherein the length of the second swing rod 22e is less than the length of the first swing rod 21e. By configuring the acoustic rod, the first swing rod and the connecting member as an integral part, the welding head assembly can obtain a configuration of an upper swing rod and a lower swing rod with different lengths on the basis of obtaining a configuration in which a longitudinal upper swing rod is combined with a longitudinal welding head. The welding head assembly with this configuration is particularly suitable for longitudinal welding occasions where the longitudinal space of the upper swing rod is not limited and the lower swing rod does not need a large avoidance.

[0078] Seventh embodiment

[0079] Based on the first embodiment, the seventh embodiment has various changes as described below. These changes are described in detail below.

[0080] Fig.10 A stereoscopic schematic diagram of the seventh embodiment of the welding head assembly is shown, in which the first swing arm 21f has a width c7 and a thickness d7, and the welding head working part 220f of the second swing arm 22f has a width e7 and a thickness f7.

[0081] In the seventh embodiment, in the cross section of the first swing rod 21f, the width c7 of the first swing rod 21f is smaller than the thickness d7, so that a transverse swing rod configuration can be obtained. In the cross section of the welding head working part 220f of the second swing rod 22f, the width e7 of the welding head working part 220f is greater than the thickness f7, so that the second swing rod 22f also presents a longitudinal swing rod configuration, and the welding head is also a longitudinal welding head at this time. By configuring the acoustic rod, the first swing rod and the connecting member into an integral part, the welding head assembly can form a configuration combining a transverse upper swing rod and a longitudinal welding head. The welding head assembly with this configuration is particularly suitable for longitudinal welding occasions where the longitudinal space of the upper swing rod is limited and the lower swing rod needs a large avoidance.

[0082] Eighth Embodiment

[0083] Based on the seventh embodiment, the eighth embodiment has various changes as described below. These changes are described in detail below.

[0084] Fig.11 The 3D schematic diagram of the eighth embodiment of the welding head assembly is shown, and the first swing rod 21g and the second swing rod 22g have different lengths in the second length direction b, wherein the length of the second swing rod 22g is less than the length of the first swing rod 21g. By configuring the acoustic rod, the first swing rod and the connecting member as an integral part, the welding head assembly can obtain a configuration with an upper swing rod and a lower swing rod of different lengths on the basis of obtaining a configuration combining a transverse upper swing rod with a longitudinal welding head. The welding head assembly with this configuration is particularly suitable for longitudinal welding occasions where the longitudinal space of the upper swing rod is limited and the lower swing rod does not need a large avoidance.

[0085] As in one or more of the first to eighth embodiments, the configurations of the first swing rod 21 and the second swing rod 22 may also have many variations or modifications. For example, the second swing rod 22 has a variable cross-section structure in the second length direction b. Figures 8 to 11 In the fifth to eighth embodiments shown, the second swing arm has a smaller cross-sectional area near the working part of the welding head as shown in the figure. Of course, in other embodiments different from the figure, the first swing arm 21 and the second swing arm 22 can both have a variable cross-sectional structure, or only the first swing arm 21 or the second swing arm 22 can have a variable cross-sectional structure, and the variable cross-sectional structure can have a different configuration from that shown in the figure. Figures 2 to 11 In the embodiment shown in the figure, the cross-section of the first swing rod 21 and / or the second swing rod 22 is rectangular. In some other embodiments different from those shown in the figure, the cross-section of the first swing rod 21 and / or the second swing rod 22 may also be a circular structure.

[0086] As in one or more of the first to eighth embodiments, there may be many variations or changes in the configuration of the acoustic rod 1. For example, the acoustic rod 2 may be a cylindrical structure as shown in the figure, or a square structure, or other variable cross-section structures.

[0087] As in one or more of the first to eighth embodiments described above, the lengths of the upper swing rod 21 and the lower swing rod 22 along direction b may be the same, or the length of the upper swing rod may be greater than the length of the lower swing rod, or the length of the upper swing rod may be less than the length of the lower swing rod;

[0088] As in one or more of the first to eighth embodiments, the configuration of the connecting member 3 may also have many variations or modifications. For example, the connecting member 3 may be a square structure as shown in the figure, or a square block structure with a wedge-shaped structure, or a connecting structure with a hole, or other suitable clamping connecting structures.

[0089] In one or more of the first to eighth embodiments, to adapt to different welding occasions, the width of the welding head working part can be the same as the thickness of the welding head working part, and / or the width of the first swing rod can be the same as the thickness of the first swing rod. The welding head assembly with the above configuration can be realized by configuring the acoustic rod, the first swing rod and the connecting member into an integral part.

[0090] As described above, the welding head assembly in one or more embodiments can be applied to an ultrasonic welding machine, wherein the acoustic rod 1 in the welding head assembly is connected to the transducer or the amplitude modulator in the ultrasonic welding machine, and the ultrasonic welding machine has a clamping structure, which clamps the connecting piece 3 in the welding head assembly, and in the ultrasonic welding machine, the ultrasonic welding machine applies a pressure to the welding head assembly through the connecting piece 3.

[0091] Although the present invention is disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, any modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope defined by the claims of the present invention.

Claims

1. A welding head assembly for ultrasonic welding, characterized in that: The invention comprises an acoustic rod, a swing rod and a connecting piece, wherein the swing rod is divided into two parts by the acoustic rod, namely a first swing rod and a second swing rod, the first swing rod connects the acoustic rod and the connecting piece, one end of the second swing rod is connected to the acoustic rod, and the other end is configured as a welding head working part; Wherein, the acoustic rod, the first swing rod and the connecting member are an integrated part; 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 junction between the connecting member and the first swing rod is the location of the node.

2. The welding head assembly according to claim 1, characterized in that: The acoustic rod extends along a first length direction, which is the same as the propagation direction of ultrasonic waves on the acoustic rod during ultrasonic welding. The first swing rod and the second swing rod extend along a second length direction respectively, and the first length direction is perpendicular to the second length direction.

3. The welding head assembly according to claim 2, characterized in that: The distance between the upper end surface of the connecting piece and the center line of the acoustic rod is between 143 and 148 mm.

4. The welding head assembly according to claim 3, characterized in that: The distance from the lower end of the second swing rod to the center line is between 79 and 87 mm.

5. The welding head assembly according to claim 3, characterized in that: The distance from the lower end of the second swing rod to the center line is between 43 and 63 mm.

6. The welding head assembly according to claim 4 or 5, characterized in that: The acoustic rod is cylindrical, and its outer diameter is between 36 mm and 42 mm. The cross section of the first swing rod and / or the second swing rod is rectangular.

7. The welding head assembly according to any one of claims 1 to 5, characterized in that: The first swing arm is one of a transverse swing arm configuration and a longitudinal swing arm configuration, and the second swing arm is one of a longitudinal swing arm configuration and a transverse swing arm configuration.

8. The welding head assembly according to claim 1 or 2, characterized in that: The cross section of the first swing rod and / or the second swing rod is rectangular or circular; the acoustic rod is cylindrical or square.

9. The welding head assembly according to claim 2, characterized in that: The first swing rod and / or the second swing rod is a variable cross-section structure along the second length direction; the acoustic rod is a variable cross-section structure along the first length direction.

10. The welding head assembly according to claim 1 or 2, characterized in that: In a cross section of the welding head working part, the width of the welding head working part is greater than, equal to, or less than the thickness of the welding head working part.

11. The welding head assembly according to claim 1, characterized in that: The second swing rod is configured to be replaceable.

12. An ultrasonic welding machine, comprising a transducer or an amplitude modulator, a clamping mechanism and a welding head assembly as claimed in any one of claims 1 to 11, The acoustic rod in the welding head assembly is connected to the transducer or amplitude modulator in the ultrasonic welding machine. The clamping mechanism clamps the connecting piece in the welding head assembly and applies a pressure to the welding head assembly through the connecting piece.

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