Ultrasonic welding head and ultrasonic welding device

Abstract

The present invention relates to an ultrasonic welding device, and specifically to an ultrasonic welding head and an ultrasonic welding device, wherein an ultrasonic welding head comprises a welding head body, a first accommodating cavity and a second accommodating cavity are arranged in the welding head body, and the first accommodating cavity intersects with the second accommodating cavity; a first telescopic device is movably arranged in the first accommodating cavity, and a limiting rod is fixedly arranged in the second accommodating cavity and is inserted and fixed in the first telescopic device.

Description

Technical Field

[0001] The invention relates to an ultrasonic welding device, in particular to an ultrasonic welding head and an ultrasonic welding device. Background Art

[0002] Ultrasonic welding uses high-frequency vibration waves to transmit to the surfaces of two workpieces to be welded. Under the action of ultrasonic waves, the surfaces of the workpieces rub against each other to form a fusion between the molecular layers. The main components of an ultrasonic welding system include an ultrasonic generator, a transducer, a horn, and a welding head. Usually, the current is converted into electrical energy through an ultrasonic generator, and then the high-frequency electrical energy is converted into mechanical motion of the same frequency again through the transducer, and then transmitted to the welding head through the horn device. The welding head transmits the received vibration energy to the joint of the workpiece to be welded and converts it into heat energy to achieve the product welding effect. Ultrasonic waves are widely used in the field of plastic welding. Compared with hot welding, which relies purely on heat transfer to melt plastic, this method does not require preheating, can instantly convert energy, is short in time, and is relatively safe. However, the vibration of ultrasonic waves sometimes causes damage to certain products during the welding process. Especially when welding certain thin-film plastics, the vibration of the surrounding air driven by ultrasonic waves will break the film during welding, which brings limitations to the application of ultrasonic waves in welding. Of course, we can generally reduce the impact of this harmful vibration on the welded product as much as possible by reducing the welding amplitude and shortening the welding time, but this problem is still difficult to eliminate. Summary of the invention

[0003] In view of the defects of the prior art, the present invention provides an ultrasonic welding head and an ultrasonic welding device, which are applied to the welding of closed shapes such as circular rings or ellipses by ultrasonic waves, especially to the welding of ultra-thin workpieces. By adding a retractable mechanism to the welding head, ultrasonic vibration is absorbed during welding. This can avoid the workpiece being damaged by ultrasonic vibration, solve some problems existing in the ultrasonic welding process, and expand the scope of application of ultrasonic welding, specifically:

[0004] In one aspect, the present application provides an ultrasonic welding head, which includes a welding head body, wherein a first accommodating cavity and a second accommodating cavity are provided in the welding head body, and the first accommodating cavity intersects with the second accommodating cavity;

[0005] A first telescopic device is movably disposed in the first accommodating cavity,

[0006] The limiting rod is fixedly disposed in the second accommodating cavity and is inserted and fixed with the first telescopic device.

[0007] Preferably, in the above-mentioned ultrasonic welding head, the first telescopic device includes a first support rod, an elastic element arranged on the first support rod, one end of the first support rod is arranged at the closed end of the first accommodating cavity, and the other end of the first support rod is protrudingly arranged at the movable end of the first accommodating cavity.

[0008] Preferably, in the above-mentioned ultrasonic welding head, the elastic element is a spring, and the spring is sleeved on the first support rod.

[0009] Preferably, in the above-mentioned ultrasonic welding head, the first accommodating cavity comprises a first cylindrical cavity and a second cylindrical cavity, and the diameter of the first cylindrical cavity is smaller than the diameter of the second cylindrical cavity.

[0010] Preferably, in the above-mentioned ultrasonic welding head, the area of ​​the first support rod where the elastic element is sleeved is arranged in the second column cavity.

[0011] Preferably, in the above-mentioned ultrasonic welding head, the cross-section of the first support rod is T-shaped, and the T-shaped first support rod is arranged in an area of ​​the first column cavity where an elliptical through hole is provided, and a limiting rod is inserted in the elliptical through hole, and the limiting rod is accommodated in the second accommodating cavity.

[0012] Preferably, the above-mentioned ultrasonic welding head further includes a stopper, which is arranged in the second accommodating cavity, and the stopper is connected to the limiting rod.

[0013] Preferably, in the above-mentioned ultrasonic welding head, the welding head body also includes a welding head arc transition section connecting the end of the welding head body, the other end of the welding head arc transition section and the input connection part of the welding head body, and the diameter of the input connection part of the welding head body is larger than the diameter of the end of the welding head body.

[0014] On the other hand, the present application further provides an ultrasonic welding device, which includes an ultrasonic welding head as described in any one of the above items.

[0015] The present invention has at least the following beneficial effects:

[0016] The end of the welding head body is annular. When the welding head body is in a non-working state, the end of the first telescopic device protrudes from the welding head body. When the welding head body is in a lower working state, the end of the welding head body is displaced toward the welding target. When the end of the first telescopic device contacts the welding target, the welding target acts on the first telescopic device so that the first telescopic device moves away from the welding target until the end of the welding head body contacts the welding target. At this time, the welding head body converts electrical energy into high-frequency vibration energy to act on the end of the welding head body. The end of the welding head body transfers the high-frequency vibration energy to the welding target. The welding target generates heat energy under the high-frequency vibration energy, and the heat energy connects the welding target. The central part of the welding area also receives mechanical energy and vibrates. The frequency of vibration and the hammering pressure received by the central part of the welding area are much smaller than those of the welding area, so the received vibration energy cannot be converted into heat energy. Since the central part of the welding area is contacted by the end of the first telescopic device, when the central part of the welding area is vibrated, the vibration capacity is released by being transmitted to the first telescopic device, thereby ensuring that the center of the welding area is not destroyed in the welding film. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic structural diagram of an ultrasonic welding head provided in an embodiment of the present invention;

[0018] Figure 2 A schematic structural diagram of an ultrasonic welding head provided in an embodiment of the present invention;

[0019] Figure 3 A welding pattern formed by an ultrasonic welding head provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0022] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] Embodiment 1

[0024] like Figure 1-2 As shown, the present invention provides an ultrasonic welding head, which includes a welding head body 1, wherein the welding head body 1 is provided with a first accommodating cavity 11 and a second accommodating cavity 12, and the first accommodating cavity 11 intersects with the second accommodating cavity 12;

[0025] The first telescopic device is movably disposed in the first accommodating cavity 11,

[0026] The limiting rod 3 is fixedly disposed in the second accommodating cavity 12 and is inserted and fixed with the first telescopic device.

[0027] The working principle of the above-mentioned embodiment is as follows: the end of the welding head body 1 is annular, the welding head body 1 is in a non-working state, the end of the first telescopic device protrudes from the welding head body 1, and when the welding head body 1 is in a lower working state, the end of the welding head body 1 is displaced toward the welding target, and when the end of the first telescopic device contacts the welding target, the welding target acts on the first telescopic device so that the first telescopic device moves away from the welding target until the end of the welding head body 1 contacts the welding target. At this time, the welding head body 1 converts electrical energy into high-frequency vibration energy to act on the end of the welding head body 1, and the end of the welding head body 1 transfers the high-frequency vibration energy to the welding target, and the welding target generates heat energy under the high-frequency vibration energy, and the heat energy connects the welding target.

[0028] like Figure 3As shown, when the end of the welding head body 1 transmits high-frequency vibration energy to the welding target, the end of the welding target in contact with the welding head body 1 forms a welding area 60, and the welding area is vibrated based on the high-frequency vibration energy, and the mechanical energy of the high-frequency vibration (which can also be understood as repeated hammering) is converted into heat energy. The central part of the welding area also receives mechanical energy and vibrates. The frequency of the vibration and the hammering pressure received by the central part of the welding area are much smaller than those of the welding area, so it is impossible to convert the received vibration energy into heat energy (and the vibration of this part is relatively concentrated), so it is easy to break the film.

[0029] In the present application, since the central part 61 of the welding area is contacted by the end of the first telescopic device, when the central part of the welding area is vibrated, the vibration capacity is released by being transmitted to the first telescopic device, thereby ensuring that the center of the welding area is not destroyed in the welding film.

[0030] As a further preferred embodiment, the end of the first accommodating cavity 11 is in the same plane as the end 10 of the welding head body.

[0031] As a further preferred embodiment, the first telescopic device includes a first support rod 2, an elastic element 4 arranged on the first support rod 2, one end of the first support rod 2 (also understood as a non-pressing block area) is arranged at the closed end of the first accommodating cavity 11, and the other end of the first support rod 2 is protrudingly arranged at the movable end of the first accommodating cavity 11. The first support rod 2 performs telescopic displacement along the path provided by the first accommodating cavity 11.

[0032] As a further preferred embodiment, the elastic element 4 is a spring, and the spring is sleeved on the first support rod 2 .

[0033] As a further preferred embodiment, the first container includes a first cylindrical cavity 111 and a second cylindrical cavity 112, and the diameter of the first cylindrical cavity 111 is smaller than the diameter of the second cylindrical cavity 112. The first cylindrical cavity 111 is located in a relatively small amplitude region of the welding head body 1, that is, during the ultrasonic welding process, the first cylindrical cavity 111 is in a relatively stable state, and one end of the first support rod 2 is arranged in the first cylindrical cavity 111 to relatively stably fix the first support rod 2 to limit the circumferential movement of the first support rod 2.

[0034] As a further preferred embodiment, the cross section of the first support rod 2 is T-shaped, and the area where the T-shaped first support rod 2 is arranged in the first cylindrical cavity 111 is provided with an elliptical through hole, and the limiting rod 3 is inserted in the elliptical through hole, and the limiting rod 3 is accommodated in the second accommodating cavity 12. The longitudinal displacement area of ​​the first support rod 2 is limited by the limiting rod 3 and the elliptical through hole. The area of ​​the T-shaped first support rod 2 protruding from the end 10 of the welding head body matches the second cylindrical cavity 112, that is, the diameter of this area is larger than the diameter of the other end. This arrangement increases the contact surface between the first support rod 2 and the welding target, which is conducive to further releasing the vibration energy.

[0035] Since the rest of the first support rod 2 is in the high-frequency vibration area, the vibration direction is the depth direction of the welding head body 1. In order to overcome the displacement caused by the vibration in the depth direction, the present application uses a transverse limit rod 3 to limit the displacement of the first support rod 2 during the movement, thereby ensuring that the other end of the first support rod 2 is in stable and firm contact with the welding target during ultrasonic welding.

[0036] As a further preferred embodiment, it further includes a stopper 5 disposed in the second accommodating cavity 12 , and the stopper is connected to the limiting rod 3 .

[0037] As a further preferred embodiment, the welding head body 1 further comprises a welding head arc transition section 7 connected to the welding head body end 10, the other end of the welding head arc transition section and the input connection part 8 of the welding head body, and the diameter of the input connection part of the welding head body 1 is larger than the diameter of the welding head body end 10. So that the vibration output by the welding head body end 10 is increased.

[0038] Embodiment 2

[0039] The present application further provides an ultrasonic welding device, which includes an ultrasonic welding head as described in any one of the above items.

[0040] The working principle of the ultrasonic welding device described above is the same as that of the ultrasonic welding head provided in the embodiment, which will not be described in detail here.

[0041] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0042] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An ultrasonic welding head, characterized in that: It comprises a welding head body, wherein a first accommodating cavity and a second accommodating cavity are arranged in the welding head body, and the first accommodating cavity intersects with the second accommodating cavity; A first telescopic device is movably disposed in the first accommodating cavity, A limiting rod, fixedly disposed in the second accommodating cavity and inserted and fixed with the first telescopic device; The first telescopic device includes a first support rod, an elastic element arranged on the first support rod, one end of the first support rod is arranged at the closed end of the first accommodating cavity, and the other end of the first support rod is protrudingly arranged at the movable end of the first accommodating cavity; The first accommodating cavity includes a first cylindrical cavity and a second cylindrical cavity, and the diameter of the first cylindrical cavity is smaller than the diameter of the second cylindrical cavity; The first support rod is telescopically displaced along the path provided by the first accommodating cavity, the cross section of the first support rod is T-shaped, an elliptical through hole is provided in the area where the T-shaped first support rod is arranged in the first column cavity, the limiting rod is inserted in the elliptical through hole, the limiting rod is accommodated in the second accommodating cavity, and the area of ​​the T-shaped first support rod protruding from the end of the welding head body matches the second column cavity; Wherein, when the welding head body is in a non-working state, the end of the first telescopic device protrudes from the welding head body; when the welding head body is in a working state, the end of the welding head body is displaced toward the welding target; when the end of the first telescopic device contacts the welding target, the welding target applies a force to the first telescopic device so that the first telescopic device moves in a direction away from the welding target until the end of the welding head body contacts the welding target; The center part of the welding area is contacted by the end of the first telescopic device. When the center part of the welding area is vibrated, the vibration can be released by being transmitted to the first telescopic device, thereby ensuring that the center of the welding area is not destroyed in the welding film.

2. An ultrasonic welding head according to claim 1, characterized in that: The elastic element is a spring, and the spring is sleeved on the first supporting rod.

3. The ultrasonic welding head according to claim 1, characterized in that: The area of ​​the first support rod where the elastic element is sleeved is arranged in the second column cavity.

4. The ultrasonic welding head according to claim 1, characterized in that: It also includes a stopper, which is arranged in the second accommodating cavity, and the stopper is connected to the limiting rod.

5. The ultrasonic welding head according to claim 1, characterized in that: The welding head body also includes a welding head arc transition section connecting the end of the welding head body, the other end of the welding head arc transition section and the input connection part of the welding head body, and the diameter of the input connection part of the welding head body is greater than the diameter of the end of the welding head body.

6. An ultrasonic welding device, characterized in that: An ultrasonic welding head comprising any one of claims 1 to 5.

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