Ultrasonic transmission unit

Abstract

The object of the present invention is to provide an ultrasonic transmission unit, which has extremely small radial and axial vibrations at a fixed position. According to one aspect of the present invention, the ultrasonic transmission unit includes an amplitude modulator, which also includes a node structure arranged at the node position of the amplitude modulator, the node structure includes a flange surrounding the node position, a thin-walled circular ring structure extending from the flange with the axis of the amplitude modulator as the axis, and an assembly ring arranged at the free end of the thin-walled circular ring structure.

Description

Technical Field

[0001] The present invention relates to an ultrasonic transmission unit. Background Art

[0002] Ultrasonic amplitude modulator, also known as ultrasonic amplitude transformer or ultrasonic energy concentrator, is usually a variable cross-section rod that connects the ultrasonic transducer and the load, amplifies the mechanical vibration, generates energy concentrating effect, and effectively transmits ultrasonic energy from the transducer to the load. In the traditional structure and technology of amplitude modulator, a flange is usually added at the node plane of the amplitude modulator, and the ultrasonic vibration system is fixed to the equipment by the flange.

[0003] At present, it is necessary to design an ultrasonic rolling welding system. The traditional modulator structure has radial vibration at the wave node, and a large gap needs to be retained between the flange and the modulator to avoid energy loss. It cannot achieve a tight fit and it is difficult to avoid radial runout or uneven rotation of the welding head. Therefore, the traditional modulator structure obviously cannot meet the requirements of ultrasonic rolling welding. Summary of the invention

[0004] An object of the present invention is to provide an ultrasonic transmission unit, the axial and radial vibrations of which are extremely small at the fixed position.

[0005] According to one aspect of the present invention, an ultrasonic transmission unit includes an amplitude modulator, which also includes a node structure arranged at the node position of the amplitude modulator, and the node structure includes a flange surrounding the node position, a thin-walled circular ring structure extending from the flange and with the axis of the amplitude modulator as the axis, and an assembly ring arranged at the free end of the thin-walled circular ring structure.

[0006] In one embodiment, the amplitude modulator is a rod with a constant cross-section or a rod with a variable cross-section.

[0007] In one embodiment, the thin-walled circular ring structure includes one circular ring or a plurality of circular rings with gaps maintained.

[0008] In one embodiment, the node structure is an integral part of the amplitude modulator.

[0009] In one embodiment, the node structure and the amplitude modulator are separate components and are tightly connected.

[0010] In one embodiment, the thin-walled annular structure extends from an edge of the flange.

[0011] In one embodiment, the thin-walled circular ring structure includes a first circular ring extending from the flange, and a second circular ring extending back from the first circular ring.

[0012] In one embodiment, the ring is a straight cylinder or a conical cylinder structure.

[0013] In one embodiment, the wall thickness of the thin-walled annular structure is within 4 mm.

[0014] Different from the existing structural process of adding a flange to an ultrasonic modulator, the present invention adopts the method of adding a radial flange to the wave node surface of the modulator, further generating a thin-walled circular ring structure on the radial flange, and arranging an assembly ring at the end of the thin-walled circular ring structure. The radial and axial vibrations of the assembly ring can be substantially ignored, thereby reducing or even avoiding radial runout or uneven rotation. Therefore, the assembly ring can be fixedly clamped and used to transmit torque, so that the modulator can support the ultrasonic vibration of the ultrasonic welding head on the one hand, and accept torque on the other hand, and transmit the torque to the ultrasonic welding head for rolling welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] 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:

[0016] Figure 1 It is a schematic diagram of the ultrasonic transmission unit in Example 1.

[0017] Figure 2 is along Figure 1 Half section view along line A-A.

[0018] Figure 3 It is the modal analysis cloud diagram of the ultrasonic transmission unit in Example 1.

[0019] Figure 4 It is a schematic diagram of the ultrasonic transmission unit in Example 2.

[0020] Figure 5 is along Figure 4 Half section view along line B-B.

[0021] Figure 6 It is a schematic diagram of the ultrasonic transmission unit in Example 3.

[0022] Figure 7 is along Figure 6 Half section view along line C-C. DETAILED DESCRIPTION

[0023] The present invention is further described below in conjunction with specific embodiments and drawings. More details are elaborated in the following description to facilitate a full understanding of the present invention. However, the present invention can obviously be implemented in a variety of other ways different from the description herein. Those skilled in the art can make similar generalizations and deductions based on actual application situations without violating the connotation of the present invention. Therefore, the protection scope of the present invention should not be limited by the content of this specific embodiment.

[0024] The accompanying drawings are only examples and are not drawn to scale, and should not be used to limit the actual scope of protection required by the present invention.

[0025] like Figure 1 As shown, the ultrasonic transmission unit includes an amplitude modulator 1 and a node structure 2. The two ends 11 and 12 of the amplitude modulator 1 are reduced relative to the diameter of the amplitude modulator 1 body. The amplitude modulator 1 body is a uniform cross-sectional structure. The amplitude modulator 1 is a symmetrical structure symmetrical along the axis center. The amplitude modulator 1 does not substantially amplify or reduce ultrasonic waves. In another embodiment, the cross-sectional shape of the amplitude modulator 1 can be a variable cross-sectional shape such as an exponential shape, a catenary shape, a step shape, and a conical shape, or a composite shape composed of several shapes. Figure 1 In the embodiment shown, the two ends 11, 12 of the amplitude modulator 1 may also have the same diameter as the main body or an enlarged diameter.

[0026] The node structure 2 is arranged at a node position of the amplitude modulator 1 . At this position, the axial vibration of the amplitude modulator 1 is substantially zero, and only radial vibration exists.

[0027] like Figure 2 As shown, the node position 10 is located near the middle of the axial direction of the amplitude modulator 1. The node structure 2 is integrated with the amplitude modulator 1, and the node structure 2 includes a flange 21 surrounding the node position 10, a thin-walled circular ring structure 22 extending from the flange 21 and taking the axis of the amplitude modulator 1 as the axis, and an assembly ring 23 arranged at the free end of the thin-walled circular ring structure 22. The thin-walled circular ring structure 22 can be a continuous ring or a discrete structure distributed around the circumference, and is a continuous ring in the figure. The thin-walled circular ring structure 22 can be a straight cylinder or a conical cylinder. The assembly ring 23 can be arranged on the outer circumference side or the inner circumference side of the free end of the thin-walled circular ring structure 22, and is generally arranged on the outer circumference side. The assembly ring 23 can be a circumferentially continuous structure or a discrete structure, which is suitable for being clamped, and a keyway can also be arranged on its outer ring surface. The axial direction of the assembly ring 23 can be clamped and fixed, and the outer circumferential direction can be precisely matched, which is easy to control the accuracy.

[0028] The wall thickness of the thin-walled circular ring structure 22 can be controlled within 4 mm, and its wall thickness is much smaller than its axial length or circumferential length. Its wall thickness depends on the strength of the material and the rated torque to be transmitted, so its thickness is not limited to 4 mm and can be adjusted according to actual conditions. After the assembly ring 23 is connected to a rotating body not shown in the figure, the rotating body can drive the ultrasonic transmission unit to rotate together, or vice versa. While transmitting the rotational motion or torque, the ultrasonic wave will not be transmitted to the rotating body. Due to the shape factor of the node structure 2, the ultrasonic wave is almost attenuated to zero in the longitudinal or lateral vibration of its node structure 2. Figure 3 Shows Figure 1 , Figure 2The modal analysis results of the ultrasonic transmission unit shown in the figure show that the darker the position, the stronger the ultrasonic energy, or the larger the amplitude. It can be seen that at the free end of the node structure 2, the amplitude is almost negligible. Therefore, the node structure 2 can transmit torque while transmitting ultrasonic waves. Either end of the ultrasonic transmission unit can be connected to the ultrasonic welding head. During operation, due to the existence of the node structure 2, even if the ultrasonic welding head rotates with the node structure 2 to implement rolling welding, the ultrasonic welding head will not have radial runout, resulting in uneven welding.

[0029] The modulator 1 and the node structure 2 can be made of titanium alloy or aluminum alloy, and it is not excluded that they are formed of steel materials. They can be formed by mechanical cutting, casting, or other molding processes.

[0030] The structural factors of the amplitude modulator 1 may also be changed in other ways, for example, the amplitude modulator 1 is a hollow structure, and bosses or recesses may be provided at both ends of the amplitude modulator 1. Either end 11, 12 of the amplitude modulator 1 may be used as an ultrasonic input end, and the other end may be used as an ultrasonic output end.

[0031] Figure 4 and Figure 5 Embodiment 2 is shown. This embodiment follows the component numbers and some contents of the previous embodiment, wherein the same numbers are used to represent the same or similar components, and the description of the same technical contents is selectively omitted. The description of the omitted parts can be referred to the previous embodiment, and this embodiment will not be repeated. Different from Embodiment 1, the node structure 2 and the amplitude modulator 1 are separate parts, and the two are connected by a fastener 24. Specifically, a connecting hole is provided at the node position 10 of the amplitude modulator 1, and a radially extending through hole is correspondingly provided on the flange 21, and the fastener 24 passes through the through hole and is then connected to the connecting hole. It can also play the technical effect of the previous embodiment, that is, the ultrasonic amplitude is attenuated to 0 at the position of the assembly ring 23, so it can be assembled on a rotating body to transmit torque while isolating ultrasonic vibrations.

[0032] Figure 6 and Figure 7Embodiment 3 is shown. This embodiment uses the component numbers and some contents of the previous embodiment, wherein the same number is used to represent the same or similar components, and the description of the same technical content is selectively omitted. The description of the omitted part can refer to the previous embodiment, and this embodiment will not be repeated. The thin-walled ring structure includes two layers of spaced rings, namely the first ring 221 and the second ring 220, the first ring 221 extends vertically from the edge of the flange 21, and the second ring 220 extends back at the free end of the first ring 221, and the assembly ring 23 is set at the free end of the second ring 220. It can also play the aforementioned technical effect, that is, the ultrasonic amplitude is attenuated to 0 at the position of the assembly ring 23, so it can be assembled on a rotating body for transmitting torque and isolating ultrasonic vibration at the same time. There are some changes in this embodiment, for example, the second ring 220 does not have to be folded back, and can be extended in a stepped manner with the first ring 221.

[0033] 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. An ultrasonic transmission unit, comprising an amplitude modulator, characterized in that: It also includes a node structure arranged at the node position of the amplitude modulator, the node structure includes a flange surrounding the node position, a thin-walled circular ring structure extending from the flange with the axis of the amplitude modulator as the axis, and an assembly ring arranged at the free end of the thin-walled circular ring structure, the ultrasonic transmission unit is connected to the rotating body through the assembly ring to allow the rotating body to drive the ultrasonic transmission unit to rotate; Wherein, the thin-walled circular ring structure includes one circular ring or a plurality of circular rings maintaining a gap; The ring is a straight cylinder or a conical cylinder structure; The ultrasonic transmission unit is used for ultrasonic rolling welding.

2. The ultrasonic transmission unit according to claim 1, characterized in that: The amplitude modulator is a rod with a constant cross section or a rod with a variable cross section.

3. The ultrasonic transmission unit according to claim 1, characterized in that: The node structure and the amplitude modulator are integrally formed.

4. The ultrasonic transmission unit according to claim 1, characterized in that: The node structure and the amplitude modulator are separate parts and are tightly connected.

5. The ultrasonic transmission unit according to claim 1, characterized in that: The thin-walled circular ring structure extends from the edge of the flange.

6. The ultrasonic transmission unit according to claim 1, characterized in that: The thin-walled circular ring structure includes a first circular ring extending from the flange, and a second circular ring extending from the first circular ring.

7. The ultrasonic transmission unit according to claim 1, characterized in that: The wall thickness of the thin-walled ring structure is within 4 mm.

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