Ultrasonic welding head assembly and welding device

Abstract

The utility model belongs to the technical field of ultrasonic welding, and specifically relates to an ultrasonic welding head assembly and a welding device, wherein the ultrasonic welding head assembly comprises a welding head body, a welding nozzle and a connecting portion, wherein the welding head body and the welding nozzle are arranged vertically, the welding head body is provided with a mounting hole, and the welding nozzle is detachably connected to the mounting hole through the connecting portion; wherein the length of the welding head body is set to be twice or more of a half wavelength, the welding head body is a full-wave vibration mode at a resonant frequency, and the vibration mode includes at least two acoustic wave nodes; the utility model can support both ends of the welding head body by setting the welding head body to a full-wave structure, thereby improving the welding pressure range and structural rigidity, and improving the stability during welding; by adopting a detachable connection method between the welding nozzle and the welding head body, the welding nozzle can be quickly replaced, and the disassembly and assembly are more convenient, thereby saving the use cost.

Description

Technical Field

[0001] The utility model belongs to the technical field of ultrasonic welding, and in particular relates to an ultrasonic welding head component and a welding device. Background Art

[0002] Ultrasonic welding is a method of transmitting ultrasonic high-frequency vibrations to the surfaces of two objects to be welded, causing the two surfaces to rub against each other under pressure to form a fusion between the molecular layers. As an energy-saving and environmentally friendly technology, ultrasonic welding has been widely used in welding processes such as metals and plastics.

[0003] As a key executive component in ultrasonic welding, different configuration designs of ultrasonic welding heads directly affect welding application requirements, so the design of ultrasonic welding heads is particularly important. The inventors found that the existing ultrasonic welding heads have at least the following technical problems in practical applications:

[0004] On the one hand, the existing ultrasonic welding head adopts a half-wave structure design. During the welding process, the ultrasonic welding head is prone to obvious deformation when it is subjected to greater pressure. In addition, the rigidity of the ultrasonic welding head decreases, resulting in unstable welding. On the other hand, due to the long swing arm structure of the ultrasonic welding head, as the welding frequency continues to increase, the welding surface of the ultrasonic welding head will wear out, and the entire ultrasonic welding head needs to be replaced, which increases the cost of use.

[0005] Therefore, it is necessary to improve the structure of the existing ultrasonic welding head to overcome the shortcomings in practical applications. Utility Model Content

[0006] Based on the above-mentioned shortcomings and deficiencies in the prior art, one of the purposes of the present invention is to at least solve one or more of the above-mentioned problems in the prior art. In other words, one of the purposes of the present invention is to provide an ultrasonic welding head assembly and a welding device that meet one or more of the above-mentioned needs.

[0007] In order to achieve the above utility model purpose, the utility model adopts the following technical solutions:

[0008] The utility model provides an ultrasonic welding head assembly, comprising a welding head body, a welding nozzle and a connecting part, wherein the welding head body and the welding nozzle are arranged vertically, the welding head body is provided with a mounting hole, and the welding nozzle is detachably connected to the mounting hole through the connecting part; wherein the length of the welding head body is set to be twice or more of a half wavelength, the welding head body is a full-wave vibration mode at a resonant frequency, and the vibration mode includes at least two acoustic wave nodes.

[0009] As a preferred solution, the connecting portion is configured as a locking bolt, and the locking bolt is installed in the mounting hole and connected to the welding nozzle.

[0010] As a preferred solution, one end of the welding nozzle has a locking groove, the locking groove is connected to the locking bolt, and the other end of the welding nozzle has a welding position.

[0011] As a preferred solution, the mounting hole is provided through the welding head body and is located at the antinode of the vibration mode of the welding head body.

[0012] As a preferred solution, there is a certain gap between the welding head body and the welding nozzle.

[0013] As a preferred solution, the length of the welding nozzle is set to half the wavelength and includes at least one acoustic wave node.

[0014] As a preferred solution, a plurality of vibration-damping structures are provided on the welding head body, and the plurality of vibration-damping structures are respectively provided on two side walls of the welding head body; wherein the plane where the vibration-damping structures are located is perpendicular to the axis of the welding nozzle.

[0015] As a preferred solution, there are four vibration reduction structures, which are respectively arranged at four azimuth angles of the welding head body.

[0016] As a preferred solution, each of the vibration reduction structures comprises a node flange and a fixing block, wherein the node flange is connected to the position of the acoustic wave node on the welding head body, and the fixing block is provided with a through hole.

[0017] The utility model also provides an ultrasonic welding device, comprising an ultrasonic welding head assembly as described in any of the above schemes, a transducer, and an amplitude modulator, wherein the ultrasonic welding head assembly is connected to the amplitude modulator, and the amplitude modulator is connected to the transducer.

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] The utility model provides an ultrasonic welding head assembly, which can support both ends of the welding head body by setting the welding head body as a full-wave structure, so that the ultrasonic welding head is not easily deformed while bearing greater pressure during welding, thereby improving the welding pressure range and stability during welding, and also improving the structural rigidity of the ultrasonic welding head.

[0020] The utility model provides an ultrasonic welding head assembly, which adopts a detachable connection method between the welding nozzle and the welding head body. As the number of welding increases, when the welding position of the welding nozzle is worn, the welding nozzle only needs to be disassembled to achieve rapid replacement, which not only makes disassembly and assembly more convenient, but also saves use costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, drawings of other embodiments can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a schematic diagram of the overall structure of the ultrasonic welding head assembly of the embodiment of the utility model;

[0023] Figure 2 It is a top view of the ultrasonic welding head assembly of the embodiment of the utility model;

[0024] Figure 3 It is a cross-sectional view taken along line AA of an ultrasonic welding head assembly according to an embodiment of the present utility model;

[0025] Figure 4 It is a schematic diagram of the vibration mode of the ultrasonic welding head assembly of the embodiment of the utility model;

[0026] In the figure: 1 welding head body, 11 mounting hole, 12 acoustic wave node, 2 welding nozzle, 21 locking groove, 22 welding position, 23 acoustic wave node, 3 connecting part, 31 locking bolt, 4 vibration reduction structure, 41 node flange, 42 fixing block, 421 through hole, 51 vibration mode, 52 vibration mode. DETAILED DESCRIPTION

[0027] In order to more clearly illustrate the embodiments of the present application, the specific implementation methods of the present application will be described below with reference to the accompanying drawings. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0028] In the description of the embodiments of the present application, terms such as "upper", "lower", "front", and "back" and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the application.

[0029] The existing ultrasonic welding head adopts a half-wave structure design. During the welding process, the ultrasonic welding head is prone to obvious deformation when it is subjected to greater pressure. In addition, the rigidity of the ultrasonic welding head decreases, resulting in unstable welding. Due to the ultrasonic welding head with a long swing arm structure, the welding surface of the ultrasonic welding head will wear out as the welding frequency continues to increase, and the entire ultrasonic welding head needs to be replaced, which increases the cost of use.

[0030] In order to solve the above technical problems, Figures 1 to 4 As shown, according to some embodiments of the present application, an ultrasonic welding head assembly is provided, including a welding head body 1, a welding nozzle 2 and a connecting portion 3, wherein the welding head body 1 and the welding nozzle 2 are arranged vertically, the welding head body 1 is provided with a mounting hole 11, and the welding nozzle 2 is detachably connected to the mounting hole 11 through the connecting portion 3; wherein, the length of the welding head body 1 is set to be twice or more of the half wavelength, the welding head body 1 is a full-wave vibration mode at the resonant frequency, and the vibration mode includes at least two acoustic wave nodes 12, and by setting the welding head body 1 to a full-wave structure, the limitations of the half-wavelength ultrasonic welding head in application can be compensated, and the pressure use range of the ultrasonic welding head is broadened.

[0031] Since the energy generated at the antinode position during ultrasonic vibration propagation is the largest, in order to ensure the welding effect of the welding nozzle 2, a mounting hole 11 is provided at the antinode position of the vibration mode 51 of the welding head body 1. The mounting hole 11 is provided through the welding head body 1 and is used to install the connecting part 3.

[0032] In some embodiments, the connection portion 3 is configured as a locking bolt 31 , and the locking bolt 31 is installed in the mounting hole 11 and connected to the welding nozzle 2 , so as to fix the welding nozzle 2 to the welding head body 1 so that the welding nozzle can perform ultrasonic welding on the workpiece to be welded.

[0033] Furthermore, one end of the welding nozzle 2 has a locking groove 21, and the locking groove 21 is connected to the locking bolt 31. The other end of the welding nozzle 2 has a welding position 22, and the workpiece is welded through the welding position.

[0034] like Figure 4 As shown, the length of the welding nozzle 2 is set to an integer multiple of half the wavelength, and the welding nozzle 2 includes at least one acoustic wave node 21 to ensure that the welding position 22 at the end of the welding nozzle 2 (that is, the working area of ​​the ultrasonic welding head assembly) has the maximum amplitude and can effectively transfer the energy generated by the ultrasonic vibration to the workpiece to be welded.

[0035] During use, the welding nozzle 2 is detachably connected to the welding head body 1 by the provided locking bolt 31. As the number of welding times increases, when the welding position 22 of the welding nozzle 2 becomes worn, there is no need to replace the entire ultrasonic welding head assembly. The welding nozzle can be quickly replaced by simply disassembling it, which not only makes disassembly and assembly more convenient, but also saves usage costs.

[0036] In some embodiments, Figure 3 As shown in part B in the figure, there is a certain gap between the welding head body 1 and the welding nozzle 2. The consistency of each welding nozzle disassembly and installation is ensured by adopting precise gap matching, which can avoid re-positioning during each disassembly and installation.

[0037] like Figure 4As shown, when ultrasonic vibration propagates on the welding head body 1, a vibration mode 51 is formed. The welding head body 1 is a full-wave vibration mode at the resonant frequency. The vibration mode includes at least two acoustic wave nodes 12. The amplitude is the smallest at the position of the acoustic wave node 12, and the amplitude is close to zero.

[0038] Since the ultrasonic welding head vibrates at a high frequency during the welding process, in order to avoid affecting the welding equipment, a plurality of vibration reduction structures 4 are provided on the welding head body 1. The plurality of vibration reduction structures 4 are respectively provided on the two side walls of the welding head body 1 (such as Figure 1 The front and rear side surfaces are shown in the figure), which are used to isolate the welding head body 1 and the welding equipment from vibration; wherein the plane where the several vibration reduction structures 4 are located is perpendicular to the axis of the welding nozzle 2.

[0039] In some embodiments, there are four vibration damping structures 4, which are respectively arranged at four azimuth angles of the welding head body 1. The four vibration damping structures 4 are symmetrically arranged on the two side walls of the welding head body 1. The four vibration damping structures 4 can not only facilitate the clamping and fixing of the welding head body 1 to ensure the stability of the welding nozzle 2 when welding the workpiece to be welded, but also effectively reduce the high-frequency vibration of the welding head body during welding, thereby ensuring the structural rigidity of the welding head body.

[0040] Furthermore, each vibration damping structure 4 includes a node flange 41 and a fixing block 42. The node flange 41 is connected to the position of the acoustic node 12 on the welding head body 1, which can ensure the rigidity of the vibration damping structure and improve the stability of welding. The fixing block 42 is provided with a through hole 421. The shape of the through hole 421 can be set to a circular hole, a triangular hole or a through hole of other regular shapes, or can be set to a threaded hole. It can be specifically set according to actual needs. The vibration of the welding process can be reduced by setting the through hole 421 or the threaded hole.

[0041] In the embodiments of the present application, by setting the welding head body to a full-wave structure, the two ends of the welding head body can be supported, so that the ultrasonic welding head is not easily deformed while bearing greater pressure during the welding process, thereby improving the welding pressure range and stability during welding, and also improving the structural rigidity of the ultrasonic welding head.

[0042] According to some embodiments of the present application, an ultrasonic welding device is also provided, comprising the ultrasonic welding head assembly as described above, a transducer, and an amplitude modulator, wherein the ultrasonic welding head assembly is connected to the amplitude modulator, and the amplitude modulator is connected to the transducer. The ultrasonic vibration is transmitted to the amplitude modulator through the transducer, the amplitude of the ultrasonic vibration is modulated through the amplitude modulator, and the high-frequency ultrasonic vibration is transmitted to the welding head body, and the high-frequency vibration of the welding head body drives the welding nozzle to rub with the workpiece to be welded at a high frequency to achieve welding.

[0043] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, or a detachable connection or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0044] The above description is only a detailed description of the preferred embodiments and principles of the present application. For ordinary technicians in this field, there will be changes in the specific implementation methods based on the ideas provided by the present application, and these changes should also be regarded as the scope of protection of the present application.

Claims

1. An ultrasonic horn assembly, characterized in that: It includes a welding head body, a welding nozzle and a connecting part, wherein the welding head body and the welding nozzle are arranged vertically, the welding head body is provided with a mounting hole, and the welding nozzle is detachably connected to the mounting hole through the connecting part; wherein the length of the welding head body is set to be twice or more of the half wavelength, the welding head body is a full-wave vibration mode at the resonant frequency, and the vibration mode includes at least two acoustic wave nodes.

2. An ultrasonic horn assembly according to claim 1, characterized in that: The connecting portion is configured as a locking bolt, and the locking bolt is installed in the mounting hole and connected to the welding nozzle.

3. An ultrasonic horn assembly according to claim 2, characterized in that: One end of the welding nozzle has a locking groove, the locking groove is connected to the locking bolt, and the other end of the welding nozzle has a welding position.

4. The ultrasonic horn assembly according to claim 1, characterized in that: The mounting hole is arranged through the welding head body and is located at the antinode position of the vibration mode of the welding head body.

5. The ultrasonic horn assembly according to claim 1, characterized in that: There is a certain gap between the welding head body and the welding nozzle.

6. The ultrasonic horn assembly according to claim 1, characterized in that: The welding nozzle is set to have a length of half a wavelength and includes at least one acoustic node.

7. The ultrasonic horn assembly according to claim 1, characterized in that: The welding head body is provided with a plurality of vibration reduction structures, which are respectively arranged on the two side walls of the welding head body; wherein the plane where the vibration reduction structures are located is perpendicular to the axis of the welding nozzle.

8. An ultrasonic horn assembly according to claim 7, characterized in that: The vibration reduction structures are four and are respectively arranged at four azimuth angles of the welding head body.

9. The ultrasonic horn assembly according to claim 7, characterized in that: Each of the vibration reduction structures comprises a node flange and a fixing block. The node flange is connected to the position of the acoustic wave node on the welding head body, and the fixing block is provided with a through hole.

10. An ultrasonic welding device, characterized in that: It comprises the ultrasonic horn assembly as claimed in any one of claims 1 to 9, a transducer and an amplitude modulator, wherein the ultrasonic horn assembly is connected to the amplitude modulator, and the amplitude modulator is connected to the transducer.

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