Ultrasonic Dual Channel Welding System

Abstract

The present application relates to an ultrasonic dual channel welding system, comprising a first generator, a first acoustic assembly, a second generator, a second acoustic assembly, and a phase tracking control unit, wherein the first generator is for generating a first ultrasonic signal, the first acoustic assembly is for supplying a first welding energy to a workpiece according to the first ultrasonic signal, the second generator is for generating a second ultrasonic signal, and the second acoustic assembly is for supplying a second welding energy to the workpiece according to the second ultrasonic signal, and the phase tracking control unit generates a phase control signal in real time based on the first ultrasonic signal and the second ultrasonic signal, sends the phase control signal to the first generator and / or the second generator, and adjusts the first ultrasonic signal and / or the second ultrasonic signal so that the first welding energy and the second welding energy are in an energy superposition state.

Description

[Technical Field]

[0001] The present invention relates generally to the field of ultrasonic welding, and more particularly to an ultrasonic dual channel welding system. [Background technology]

[0002] In the field of ultrasonic welding, welding work is generally performed using a single ultrasonic welding generator. However, depending on the welding material, the power of a single ultrasonic welding generator may not be sufficient to meet the demands of high-power ultrasonic welding. Therefore, two relatively independent ultrasonic welding generator units must be used simultaneously to form one ultrasonic dual-channel generator, and the energy must be superimposed to provide high welding power.

[0003] However, because the two ultrasonic welding generator units are relatively independent, it is difficult to synchronize or asynchronously control the phase of the ultrasonic signals emitted by the two generator units when generating high-frequency ultrasonic signals. It is not possible to automatically lock the ultrasonic signals to in-phase or out-of-phase during operation, which often does not meet the user's application needs. If the phase of the ultrasonic signals emitted by the two ultrasonic welding generator units does not match the actual application needs, the ultrasonic welding energy actually output from the two paths will cancel each other out, preventing the desired welding energy superposition effect from being achieved by the ultrasonic dual-channel welding system and potentially resulting in defective welded products. When the actual application settings change, for example, from in-phase to out-of-phase or from out-of-phase to in-phase, the phase settings of each ultrasonic welding generator set cannot be adaptively changed and therefore cannot be adapted to the changed application settings. Summary of the Invention [Problem to be solved by the invention]

[0004] The technical problem that the present invention seeks to solve is to provide an ultrasonic dual channel welding system that automatically tracks and locks phase. [Means for solving the problem]

[0005] In the present invention, the technical solution adopted to solve the above technical problems relates to an ultrasonic dual-channel welding system, comprising a first generator, a first acoustic assembly, a second generator, a second acoustic assembly, and a phase tracking control unit, wherein the first generator is for generating a first ultrasonic signal, the first acoustic assembly is for supplying a first welding energy to a workpiece according to the first ultrasonic signal, the second generator is for generating a second ultrasonic signal, and the second acoustic assembly is for supplying a second welding energy to the workpiece according to the second ultrasonic signal, and the phase tracking control unit generates a phase control signal in real time based on the first ultrasonic signal and the second ultrasonic signal, sends the phase control signal to the first generator and / or the second generator, and adjusts the first ultrasonic signal and / or the second ultrasonic signal so that the first welding energy and the second welding energy are in an energy superposition state.

[0006] In one embodiment of the present application, the first acoustic assembly has a first target phase, the second acoustic assembly has a second target phase, there is a target phase difference between the first target phase and the second target phase, and the phase control signal is used to make the phase difference between the phase of the first ultrasonic signal and the phase of the second ultrasonic signal equal to the target phase difference.

[0007] In one embodiment of the present application, the phase control signal comprises a first phase control signal, and the phase tracking control unit comprises a phase monitoring control unit, a phase tracking locking unit, and a system phase setting unit, wherein the phase monitoring control unit is for monitoring the first ultrasonic signal and the second ultrasonic signal in real time and calculating a phase difference between the first ultrasonic signal and the second ultrasonic signal in real time, the system phase setting unit is for setting the target phase difference, the phase tracking locking unit is for comparing the phase difference with the target phase difference to generate the first phase control signal and sending the first phase control signal to the phase monitoring control unit, and the phase monitoring control unit is further for sending the first phase control signal to the first generator and / or the second generator.

[0008] In one embodiment of the present application, the target phase difference includes a synchronous phase difference and an asynchronous phase difference.

[0009] In one embodiment of the present application, the first phase control signal includes a high level and a low level.

[0010] In one embodiment of the present application, the first acoustic assembly has a first target phase and the second acoustic assembly has a second target phase, and the phase control signal is used to match the phase of the first ultrasonic signal to the first target phase and / or to match the phase of the second ultrasonic signal to the second target phase.

[0011] In one embodiment of the present application, the phase control signal includes a second phase control signal, and the phase tracking control unit includes a phase monitoring control unit, a phase tracking locking unit, and a system phase setting unit, wherein the phase monitoring control unit is for monitoring the first ultrasonic signal and the second ultrasonic signal in real time, the system phase setting unit is for setting the first target phase and the second target phase, the phase tracking locking unit is for comparing the phase of the first ultrasonic signal with the first target phase and comparing the phase of the second ultrasonic signal with the second target phase to generate the second phase control signal and sending the second phase control signal to the phase monitoring control unit, and the phase monitoring control unit is further for sending the second phase control signal to the first generator and / or the second generator.

[0012] In one embodiment of the present application, the second phase control signal includes a first phase difference between the phase of the first ultrasonic signal and the first target phase, and / or a second phase difference between the phase of the second ultrasonic signal and the second target phase.

[0013] In one embodiment of the present application, the range used for phase control by the phase control signal is 0° to ±180°.

[0014] In one embodiment of the present application, the first acoustic assembly comprises a first transducer, a first amplitude modulator, and a first welding head.

[0015] In one embodiment of the present application, the second acoustic assembly comprises a second transducer, a second amplitude modulator, and a second welding head.

[0016] In one embodiment of the present application, the first generator is a master generator and the second generator is a slave generator.

[0017] The ultrasonic dual-channel welding system of the present application configures a phase tracking control unit to generate a phase control signal in real time based on the ultrasonic signal, and can set a target phase difference or target phase to be achieved according to the setting requirements of the acoustic tool assembly, thereby meeting the requirements of multiple actual production processes. The phase of the ultrasonic signal of the master-slave generator can be quickly changed, and can quickly match the settings of various acoustic tool assemblies without changing the configuration of the master-slave generator, further reducing the user's usage and maintenance costs.

[0018] The features and performance of the present invention are further illustrated by the following embodiments and drawings. [Brief explanation of the drawings]

[0019] [Figure 1] FIG. 1 is a system block diagram of an ultrasonic dual channel welding system according to one embodiment of the present application. [Figure 2] 1 is an exemplary waveform diagram of a first ultrasonic signal S1 and a second ultrasonic signal S2 in phase. [Figure 3A] 10A and 10B show examples of waveform diagrams of a first ultrasonic signal S1 and a second ultrasonic signal S2 that are out of phase in three cases. [Figure 3B] 10A and 10B show examples of waveform diagrams of a first ultrasonic signal S1 and a second ultrasonic signal S2 that are out of phase in three cases. [Figure 3C] 10A and 10B show examples of waveform diagrams of a first ultrasonic signal S1 and a second ultrasonic signal S2 that are out of phase in three cases. [Figure 4] FIG. 1 is a system block diagram of an ultrasonic dual channel welding system according to another embodiment of the present application. [Figure 5] FIG. 1 is a system block diagram of an ultrasonic dual channel welding system according to another embodiment of the present application. DETAILED DESCRIPTION OF THE INVENTION

[0020] In order to make the above-mentioned objects, features and advantages of the present invention more clearly understandable, specific embodiments of the present invention will be described in detail below with reference to the drawings.

[0021] Although numerous specific details are set forth in the following description to facilitate a thorough understanding of the present invention, the present invention is not limited by the specific embodiments disclosed below, as the present invention may be practiced in other ways than those described.

[0022] As used herein and in the claims, unless the context clearly dictates otherwise, words such as "a," "one," "one," "a kind," and / or "the" do not refer to the singular but can include the plural. Generally speaking, the terms "comprising" and "including" only indicate the inclusion of explicitly identified steps or elements, and do not constitute an exclusive list, as a method or device may include other steps or elements.

[0023] Unless otherwise specified, the relative arrangement of parts and steps, numerical expressions, and values ​​described in these embodiments do not limit the scope of the present application. It is understood that, for ease of explanation, the dimensions of each part shown in the drawings are not drawn to scale. Techniques, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but, where appropriate, such techniques, methods, and devices are deemed part of the patented specification. In all examples shown and discussed herein, any specific values ​​are intended to be merely illustrative and not limiting. Therefore, other examples of the exemplary embodiments may have different values. Note that similar symbols and letters represent similar items in the following drawings, so once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0024] It should also be explained that the use of terms such as "first" and "second" to define components is intended only to facilitate the distinction between corresponding components, and that unless otherwise stated, these terms have no special meaning and should not be understood as limiting the scope of protection of the present application. Furthermore, the terms used in the present application are selected from well-known terms, but some of the terms described in the present application have been selected by the applicant at his / her own discretion, and their detailed meanings are described in the relevant parts of the description of this specification. It is intended that the present application be understood not only through the terms actually used, but also through the meanings contained in each term.

[0025] The ultrasonic dual channel welding system of the present application includes two sets of generators and acoustic assemblies and is applied to, but not limited to, high power welding application scenarios.

[0026] 1 is a system block diagram of an ultrasonic dual channel welding system according to an embodiment of the present application. As shown in FIG. 1, the ultrasonic dual channel welding system 100 includes a first generator 110, a first acoustic assembly 120, a second generator 130, a second acoustic assembly 140, and a phase tracking control unit 150. Wherein, the first generator 110 is for generating a first ultrasonic signal S1, the first acoustic assembly 120 is for supplying a first welding energy E1 to the workpiece 101 based on the first ultrasonic signal S1, the second generator 130 is for generating a second ultrasonic signal S2, and the second acoustic assembly 140 is for supplying a second welding energy E2 to the workpiece 101 based on the second ultrasonic signal S2, and the phase tracking control unit 150 generates a phase control signal C in real time based on the first ultrasonic signal S1 and the second ultrasonic signal S2 and sends it to the first generator 110 and / or the second generator 130, and adjusts the first ultrasonic signal S1 and / or the second ultrasonic signal S2 so that the first welding energy E1 and the second welding energy E2 are in an energy overlap state.

[0027] Specifically, both the first generator 110 and the second generator 130 are ultrasonic generators for generating desired ultrasonic waves, which have a certain frequency, phase, and amplitude, and can be set as needed.

[0028] Both the first acoustic assembly 120 and the second acoustic assembly 140 are acoustic components for converting ultrasonic waves into mechanical energy. These components are also referred to as the acoustic system of an ultrasonic welding machine, and each acoustic system has a resonant frequency. During the welding process, each acoustic element in the acoustic system is required to be in a resonant state, and the output frequency of the generator should match the resonant frequency of the acoustic system. This application does not limit the specific implementation of the first acoustic assembly 120 and the second acoustic assembly 140. In some embodiments, the first acoustic assembly 120 includes a first transducer, a first amplitude modulator, and a first welding head. In some embodiments, the second acoustic assembly 140 includes a second transducer, a second amplitude modulator, and a second welding head. The transducer converts the energy of the ultrasonic signal into mechanical motion of the same frequency. This mechanical motion is transmitted to the welding head via a set of amplitude modulators, which can change the amplitude. The welding head transmits the received vibration energy to the joint of the workpieces to be welded, where the vibration energy is converted into heat energy through friction, melting the materials and achieving welding. The first transducer may be the same as or different from the second transducer, the first amplitude modulator may be the same as or different from the second amplitude modulator, and the first welding head may be the same as or different from the second welding head. When welding the workpiece 101, the first and second welding heads directly contact the workpiece 101 and apply a first welding energy E1 and a second welding energy E2 to the workpiece 101, respectively, to complete the welding process.

[0029] 1, according to the principle of ultrasonic welding, a first generator 110 generates a first ultrasonic signal S1 and transmits it to a first acoustic assembly 120, which converts the first ultrasonic signal S1 into a first welding energy E1 and outputs it to the workpiece 101. A second generator 130 generates a second ultrasonic signal S2 and transmits it to a second acoustic assembly 140, which converts the second ultrasonic signal S2 into a second welding energy E2 and outputs it to the workpiece 101.

[0030] 1 , the phase tracking control unit 150 is disposed between the first generator 110 and the second generator 130. The phase tracking control unit 150 receives a first ultrasonic signal S1 from the first generator 110 and a second ultrasonic signal S2 from the second generator 130, and generates a phase control signal C in real time based on the received first ultrasonic signal S1 and second ultrasonic signal S2. The present application does not limit the number of phase control signals C, and one or more identical or different phase control signals C may be included. For example, one phase control signal C may be generated and sent to the first generator 110, and another phase control signal C may be generated and sent to the second generator 130.

[0031] In some embodiments, only the first ultrasonic signal S1 needs to be adjusted, so only the phase control signal C is sent to the first generator 110, and the first generator 110 generates an updated first ultrasonic signal S1 based on the phase control signal C so that the first welding energy E1 and the second welding energy E2 are in an energy superposition state.

[0032] In some embodiments, only the second ultrasonic signal S2 needs to be adjusted, so only the phase control signal C is sent to the second generator 130, and the second generator 130 generates an updated second ultrasonic signal S2 based on the phase control signal C so that the first welding energy E1 and the second welding energy E2 are in an energy superposition state.

[0033] In some embodiments, since the first ultrasonic signal S1 and the second ultrasonic signal S2 need to be adjusted simultaneously, the same or different phase control signals C are sent to the first generator 110 and the second generator 130, respectively, so that the first generator 110 generates an updated first ultrasonic signal S1 based on the phase control signal C, and the second generator 130 generates an updated second ultrasonic signal S2 based on the phase control signal C, so that the first welding energy E1 and the second welding energy E2 are in an energy superposition state.

[0034] In addition, when the first welding energy E1 and the second welding energy E2 are in an energy overlap state, this means that the peaks and valleys of the two energy waveforms applied to the workpiece 101 overlap, and since the energies can be overlapped rather than canceled out, this corresponds to increasing the welding power to meet the requirements for high-power welding.

[0035] According to the ultrasonic dual-channel welding system 100 of the present application, the phase tracking control unit 150 can acquire the first ultrasonic signal S1 and the second ultrasonic signal S2 in real time, generate a phase control signal C to adjust the first ultrasonic signal S1 and / or the second ultrasonic signal S2, and adaptively adjust the phases of the first ultrasonic signal S1 and the second ultrasonic signal S2, thereby making the first welding energy E1 and the second welding energy E2 into an energy superposition state in real time, thereby meeting the requirements of high-power welding and overcoming the problem in the prior art that two sets of ultrasonic generators cannot be efficiently coordinated.

[0036] The present application does not limit how the phase control signal C is generated, and any method that can cause the first welding energy E1 and the second welding energy E2 to be in an energy superposition state in real time is within the scope of protection of the present application.

[0037] In some embodiments, the first acoustic assembly 120 has a first target phase, the second acoustic assembly 140 has a second target phase, there is a target phase difference between the first target phase and the second target phase, and the phase control signal C is used to make the phase difference between the phase of the first ultrasonic signal S1 and the phase of the second ultrasonic signal S2 equal to the target phase difference.

[0038] In some embodiments, a desired target phase difference can be set according to actual needs. For example, in some embodiments, the phase signals of the first generator 110 and the second generator 130 need to be kept synchronized, and therefore the target phase difference is a synchronous phase difference. In some embodiments, the range of the synchronous phase difference is 0 to ±2°, that is, a phase difference between two signals within ±2° is considered to be synchronized. In some embodiments, the phase signals of the first generator 110 and the second generator 130 need to be kept asynchronous, and therefore the target phase difference is an asynchronous phase difference. In some embodiments, the range of the asynchronous phase difference is ±2° to ±180°.

[0039] FIG. 2 is an exemplary waveform diagram of the first ultrasonic signal S1 and the second ultrasonic signal S2 that are in phase. As shown in FIG. 2, the phase difference d between the first ultrasonic signal S1 and the second ultrasonic signal S2 is less than 2°, indicating that the two signals are in phase. FIGS. 3A-3C show exemplary waveform diagrams of the first ultrasonic signal S1 and the second ultrasonic signal S2 that are out of phase in three cases. In FIG. 3A, the phase difference d is 180°, in FIG. 3B, the phase difference d is 90°, and in FIG. 3C, the phase difference d is 135°. In the three cases shown in FIGS. 3A-3C, the first ultrasonic signal S1 and the second ultrasonic signal S2 are out of phase. The ultrasonic dual-channel welding system of the present application can adjust the phase difference between the first ultrasonic signal S1 and the second ultrasonic signal S2 as needed to meet the phase requirements of the dual-channel acoustic assembly, which means that the ultrasonic dual-channel welding system can be used in a variety of different ultrasonic welding application settings.

[0040] 4 is a system block diagram of an ultrasonic dual-channel welding system according to another embodiment of the present application. As shown in FIG. 4, the ultrasonic dual-channel welding system 200 includes the first generator 110, the first acoustic assembly 120, the second generator 130, the second acoustic assembly 140, and the workpiece 101 shown in FIG. 1, and therefore the same reference numerals are used. In the ultrasonic dual-channel welding system 200, the phase control signal C has a first phase control signal C1, and the phase tracking control unit 210 includes a phase monitoring control unit 211, a phase tracking locking unit 212, and a system phase setting unit 213. The phase monitoring control unit 211 is for monitoring the first ultrasonic signal S1 and the second ultrasonic signal S2 in real time and calculating the phase difference d between the first ultrasonic signal S1 and the second ultrasonic signal S2 in real time. The system phase setting unit 213 is for setting a target phase difference Td. The phase tracking locking unit 212 is for comparing the phase difference d with the target phase difference Td to generate a first phase control signal C1 and sending the first phase control signal C1 to the phase monitoring control unit 211. The phase monitoring control unit 211 is further for sending the first phase control signal C1 to the first generator 110 and / or the second generator 130. According to this embodiment 200, the phase monitoring control unit 211 outputs the phase difference d calculated in real time to the phase tracking locking unit 212. The system phase setting unit 213 outputs the set target phase difference Td to the phase tracking locking unit 212. The phase tracking locking unit 212 simultaneously receives the real-time phase difference d and the target phase difference Td, compares them to generate a first phase control signal C1, and sends the first phase control signal C1 to the first generator 110 and / or the second generator 130.

[0041] In some embodiments, the first phase control signal C1 includes a high level and a low level. For example, a high level indicates that the difference between the phase difference d and the target phase difference Td is within a first range, and a low level indicates that the difference between the phase difference d and the target phase difference Td is within a second range. In some embodiments, the high level is represented by the number 1, a large voltage or a large current, and the low level is represented by the number 0, a small voltage or a small current.

[0042] According to the ultrasonic dual-channel welding system 200, a user can use the system phase setting unit 213 to set a target phase difference Td according to the setting requirements of the first acoustic assembly 120 and the second acoustic assembly 140. Therefore, by adjusting the phase difference d between the first ultrasonic signal S1 and the second ultrasonic signal S2 to the target phase difference Td, the phase of the ultrasonic signal can be matched with the signals set by the first acoustic assembly 120 and the second acoustic assembly 140, that is, the phase of the ultrasonic signal can be locked.

[0043] In some embodiments, the first acoustic assembly 120 has a first target phase Tp1 and the second acoustic assembly 140 has a second target phase Tp2, and the phase control signal C is used to match the phase P1 of the first ultrasonic signal S1 to the first target phase Tp1 and / or match the phase P2 of the second ultrasonic signal S2 to the second target phase Tp2.

[0044] 5 is a system block diagram of an ultrasonic dual-channel welding system according to another embodiment of the present application. As shown in FIG. 5, the ultrasonic dual-channel welding system 300 includes the first generator 110, the first acoustic assembly 120, the second generator 130, the second acoustic assembly 140, and the workpiece 101 shown in FIG. 1, and therefore the same reference numerals are used. In the ultrasonic dual-channel welding system 300, the phase control signal C includes a second phase control signal C2, and the phase tracking control unit 310 includes a phase monitoring control unit 311, a phase tracking lock unit 312, and a system phase setting unit 313. The phase monitoring control unit 311 monitors the first ultrasonic signal S1 and the second ultrasonic signal S2 in real time, and the system phase setting unit 313 sets the first target phase Tp1 and the second target phase Tp2. 2, the phase tracking locking unit 312 is for comparing the phase P1 of the first ultrasonic signal S1 with a first target phase Tp1 and for comparing the phase P2 of the second ultrasonic signal S2 with a second target phase Tp2 to generate a second phase control signal C2, and sending the second phase control signal C2 to the phase monitoring control unit 311, which is further for sending the second phase control signal C2 to the first generator 110 and / or the second generator 130.

[0045] According to these embodiments, the second phase control signal C2 includes a first phase difference (Tp1-P1) between the phase P1 of the first ultrasonic signal S1 and a first target phase Tp1, and / or a second phase difference (Tp2-P2) between the phase P2 of the second ultrasonic signal S2 and a second target phase Tp2.

[0046] In this ultrasonic dual-channel welding system 300, the user first sets a first target phase Tp1 and a second target phase Tp2 using the system phase setting unit 313. For example, the user sets the first target phase Tp1 according to the setting requirements of the first acoustic assembly 120, and sets the second target phase Tp2 according to the setting requirements of the second acoustic assembly 140, regardless of whether the first target phase Tp1 and the second target phase Tp2 are in phase, out of phase, or have a slight angle difference. In this embodiment, the user can flexibly set the target phase to be achieved by the system, and adjust the phase P1 of the first ultrasonic signal S1 and the phase P2 of the second ultrasonic signal S2 through real-time monitoring and feedback to match the phase of the ultrasonic signals with the signals to be set by the acoustic assemblies. Finally, the user can superimpose the first welding energy E1 and the second welding energy E2 that the first generator 110 and the second generator 130 simultaneously apply to the workpiece 101.

[0047] In some embodiments, the first generator 110 is a master generator and the second generator 130 is a slave generator. The ultrasonic dual channel welding system is suitable for a master-slave generator system.

[0048] In some embodiments, the phase monitoring control unit, the phase tracking locking unit, and the system phase setting unit in the ultrasonic dual channel welding system of the present application can be implemented using analog or digital circuits.

[0049] The ultrasonic dual-channel welding system of the present application can set a target phase difference or target phase to be achieved according to the setting requirements of the acoustic tool assembly, thereby meeting the requirements of multiple actual production processes. This allows the phase of the ultrasonic signal from the master-slave generator to be quickly changed, and can quickly match the settings of various acoustic tool assemblies without changing the configuration of the master-slave generator.

[0050] Although the basic concepts have been described above, it is apparent to those skilled in the art that the above disclosure of the invention is merely illustrative and does not constitute a limitation on the present application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements, and alterations to the present application. Since such modifications, improvements, and alterations are proposed in the documents of the present application, such modifications, improvements, and alterations still fall within the spirit and scope of the exemplary embodiments of the present application.

[0051] At the same time, the present application uses specific language to describe embodiments of the present application. For example, "one embodiment," "one embodiment," and / or "some embodiments" refer to a certain feature, structure, or characteristic associated with at least one embodiment of the present application. Therefore, it should be emphasized and noted that "one embodiment," "one embodiment," or "an alternative embodiment" mentioned more than once in different places in this specification do not necessarily refer to the same embodiment. Furthermore, certain features, structures, or characteristics in one or more embodiments of the present application may be combined as appropriate.

[0052] In some embodiments, numbers are used to describe the number of components or attributes, and it should be understood that the numbers used to describe such embodiments are, in some instances, modified with modifiers such as "about," "approximately," or "nearly." Unless otherwise specified, "about," "approximately," or "nearly" indicates that the number can vary by ±20%. Correspondingly, in some embodiments, all numerical parameters used in the specification and claims are approximations, which may vary depending on the desired properties of particular embodiments. In some embodiments, the numerical parameters should be calculated using the specified number of significant digits and ordinary methods of conserving digits. While the numerical ranges and parameters used to determine the breadth of ranges in some embodiments of the present application are approximations, in certain embodiments, such numerical values ​​are determined as precisely as possible within the ranges possible.

Claims

1. 1. An ultrasonic dual channel welding system comprising: a first generator, a first acoustic assembly, a second generator, a second acoustic assembly, and a phase tracking control unit; an ultrasonic dual channel welding system, wherein the first generator generates a first ultrasonic signal, the first acoustic assembly supplies a first welding energy to a workpiece based on the first ultrasonic signal, the second generator generates a second ultrasonic signal, and the second acoustic assembly supplies a second welding energy to the workpiece based on the second ultrasonic signal, and the phase tracking control unit generates a phase control signal in real time based on the first ultrasonic signal and the second ultrasonic signal, transmits the phase control signal to the first generator and / or the second generator, and adjusts the first ultrasonic signal and / or the second ultrasonic signal so that the first welding energy and the second welding energy are in an energy superposition state.

2. 2. The ultrasonic dual channel welding system of claim 1, wherein the first acoustic assembly has a first target phase, the second acoustic assembly has a second target phase, there is a target phase difference between the first target phase and the second target phase, and the phase control signal is used to make the phase difference between the phase of the first ultrasonic signal and the phase of the second ultrasonic signal equal to the target phase difference.

3. The phase control signal comprises a first phase control signal, and the phase tracking control unit comprises a phase monitoring control unit, a phase tracking locking unit, and a system phase setting unit; the phase monitoring control unit monitors the first ultrasonic signal and the second ultrasonic signal in real time and calculates a phase difference between the first ultrasonic signal and the second ultrasonic signal in real time; the system phase setting unit sets the target phase difference; 3. The ultrasonic dual channel welding system of claim 2, wherein the phase tracking locking unit compares the phase difference with the target phase difference to generate the first phase control signal and transmits the first phase control signal to the phase monitoring control unit, and the phase monitoring control unit further transmits the first phase control signal to the first generator and / or the second generator.

4. The ultrasonic dual channel welding system of claim 3 , wherein the target phase difference includes a synchronous phase difference and an asynchronous phase difference.

5. The ultrasonic dual channel welding system of claim 3 , wherein the first phase control signal includes a high level and a low level.

6. 2. The ultrasonic dual channel welding system of claim 1, wherein the first acoustic assembly has a first target phase and the second acoustic assembly has a second target phase, and the phase control signal is used to match the phase of the first ultrasonic signal to the first target phase and / or match the phase of the second ultrasonic signal to the second target phase.

7. The phase control signal comprises a second phase control signal, and the phase tracking control unit comprises a phase monitoring control unit, a phase tracking locking unit, and a system phase setting unit; the phase monitoring control unit monitors the first ultrasonic signal and the second ultrasonic signal in real time; the system phase setting unit sets the first target phase and the second target phase; 7. The ultrasonic dual channel welding system of claim 6, wherein the phase tracking locking unit compares the phase of the first ultrasonic signal with the first target phase and compares the phase of the second ultrasonic signal with the second target phase to generate the second phase control signal, and sends the second phase control signal to the phase monitoring control unit, which further sends the second phase control signal to the first generator and / or the second generator.

8. 8. The ultrasonic dual channel welding system of claim 7, wherein the second phase control signal comprises a first phase difference between a phase of the first ultrasonic signal and the first target phase and / or a second phase difference between a phase of the second ultrasonic signal and the second target phase.

9. 2. The ultrasonic dual-channel welding system of claim 1, wherein the range used for phase control by the phase control signal is 0° to ±180°.

10. The ultrasonic dual channel welding system of claim 1 , wherein the first acoustic assembly comprises a first transducer, a first amplitude modulator, and a first welding head.

11. The ultrasonic dual channel welding system of claim 1 , wherein the second acoustic assembly comprises a second transducer, a second amplitude modulator, and a second welding head.

12. 10. The ultrasonic dual channel welding system of claim 1, wherein the first generator is a master generator and the second generator is a slave generator.

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