Welding head and welding equipment generating circular tensile vibration

Abstract

The present invention relates to the technical field of ultrasonic welding, and discloses a welding head and welding equipment that generate circular tensile vibrations. The welding head that generates circular tensile vibrations includes: a connecting portion, the connecting portion having a top surface, the center of the top surface of the connecting portion having a connecting hole, the connecting hole being used to connect and fix with a transducer; an intermediate connecting rod, one end of the intermediate connecting rod being connected to the center of the bottom surface of the connecting portion; a welding portion, the welding portion being disc-shaped, the center of the welding portion being connected to the other end of the intermediate connecting rod. The technical solution of the present invention provides a welding head and welding equipment that generate circular tensile vibrations, the welding portion can extend into the inner side of a workpiece for welding, and generates circular tensile vibrations, with good welding effect and higher efficiency.

Description

Technical Field

[0001] The patent of this invention relates to the technical field of ultrasonic welding, specifically, to a welding head and welding equipment that generates circular tensile vibration. Background Art

[0002] Ultrasonic welding is a process in which an ultrasonic generator converts electric current into electrical energy. The converted high-frequency electrical energy is converted again into mechanical motion of the same frequency through a transducer. The mechanical motion is then transmitted to the welding head through a variable amplitude structure. The welding head transmits the received vibration energy to the joint of the workpieces to be welded. The workpieces to be welded move relative to each other basically parallel to their welding surfaces. Under pressure, the surfaces of the two objects rub against each other to form a fusion between the molecular layers.

[0003] In the prior art, when ultrasonic welding is used, the horizontal surfaces between two workpieces are generally welded, and the welding head is pressed on one workpiece to fuse and weld the surfaces of the two workpieces that are in contact with each other.

[0004] However, for some structures that require welding on the inner surface of the workpiece, the existing welding head structure needs to perform ultrasonic welding on various parts of the inner surface of the workpiece during welding, which is extremely troublesome and has a poor welding effect. Summary of the invention

[0005] The purpose of the present invention is to provide a welding head and welding equipment that generate circumferential tensile vibration, aiming to solve the problem of poor welding effect when ultrasonic welding is performed on the inner surface of a workpiece in the prior art.

[0006] The present invention is implemented as follows: a welding head for generating circumferential tensile vibration, comprising:

[0007] A connecting portion, the connecting portion having a top surface, a center of the top surface of the connecting portion having a connecting hole, the connecting hole being used for connecting and fixing with a transducer;

[0008] An intermediate connecting rod, one end of which is connected to the center of the bottom surface of the connecting portion;

[0009] The welding part is in the shape of a disc, and the center of the welding part is connected to the other end of the middle connecting rod.

[0010] Optionally, an annular protrusion is arranged around the outer periphery of the welding portion.

[0011] Optionally, the annular protrusion is provided with a plurality of welding teeth protruding away from the welding portion.

[0012] Optionally, a plurality of welding teeth are evenly spaced and arranged around the center of the welding portion.

[0013] Optionally, the intermediate connecting rod has a first connecting section connected to the welding portion, and a diameter of the first connecting section gradually increases along the direction from the intermediate connecting rod to the welding portion.

[0014] Optionally, the intermediate connecting rod has a second connecting section connected to the connecting portion, and a diameter of the second connecting section gradually increases along the direction from the intermediate connecting rod to the connecting portion.

[0015] Optionally, the welding portion has a first surface facing away from the intermediate connecting rod, a protrusion protrudes from the center of the first surface of the welding portion, and a diameter of the protrusion gradually increases along the direction from the welding portion to the protrusion.

[0016] Optionally, the center of the protrusion has a tapered hole.

[0017] Optionally, the connecting portion, the middle connecting rod and the welding portion are integrally formed.

[0018] The present invention also provides a welding device, comprising a transducer for generating axial vibration and the welding head, wherein the welding head comprises:

[0019] A connecting portion, the connecting portion having a top surface, a center of the top surface of the connecting portion having a connecting hole, the connecting hole being used for connecting and fixing with a transducer;

[0020] An intermediate connecting rod, one end of which is connected to the center of the bottom surface of the connecting portion;

[0021] A welding portion, the welding portion is in a disc shape, and the center of the welding portion is connected to the other end of the middle connecting rod;

[0022] One end of the transducer is provided with a connecting column, the connecting column generates axial vibration along with the transducer, and the connecting column is fixed to the connecting hole on the top surface of the connecting part by threaded connection.

[0023] Compared with the prior art, the welding head for generating circumferential tensile vibration provided by the present invention can generate circumferential tensile vibration at the welding part through the structure provided by the welding head. The working area of ​​the welding head is the circumferential part of the welding part. When welding between the horizontal surfaces of some workpieces, the circumference of the welding part is pressed against the workpiece, and welding can be performed through the tensile vibration generated by its circumference. Moreover, when welding the inner surfaces of some workpieces, the welding part of the welding head can extend into the inner side of the workpiece for welding. Since the circumferential tensile vibration generated by the welding head is a circular tensile vibration, for some workpieces with arc-shaped inner surfaces, multiple parts of the inner surface of the workpiece can be welded at the same time, with good welding effect and higher efficiency. The problem of poor welding effect when ultrasonic welding is performed on the inner surface of the workpiece in the prior art is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a top view schematic diagram of a welding head for generating circular tensile vibration provided by the present invention;

[0025] Figure 2 It is a schematic diagram of the upward view of the welding head for generating circular tensile vibration provided by the present invention;

[0026] Figure 3 It is a three-dimensional schematic diagram of the welding equipment provided by the present invention. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0028] The implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0029] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0030] Reference Figures 1 to 3 The figure shows a preferred embodiment of the present invention.

[0031] In an embodiment of the present invention, the welding head generating circular tensile vibration comprises:

[0032] A connecting portion 10, wherein the connecting portion 10 has a top surface, and a connecting hole 10a is formed at the center of the top surface of the connecting portion 10, and the connecting hole 10a is used for connecting and fixing with the transducer 50;

[0033] An intermediate connecting rod 20, one end of which is connected to the center of the bottom surface of the connecting portion 10;

[0034] The welding portion 30 is disc-shaped, and the center of the welding portion 30 is connected to the other end of the middle connecting rod 20 .

[0035] The diameter of the intermediate connecting rod 20 is thinner than that of the connecting portion 10 and the welding portion 30. The axial vibration of the connecting portion 10 is transmitted to the center of the welding portion 30 through the intermediate connecting rod 20, thereby causing the outer peripheral edge of the welding portion 30 to vibrate. Figure 3 In this embodiment, the center direction from the intermediate connecting rod 20 to the welding part 30 is the first direction, and the opposite direction is the second direction. In this way, when the axial vibration of the intermediate connecting rod 20 drives the center of the welding part 30 to vibrate in the first direction, the outer peripheral edge of the welding part 30 vibrates in the second direction relative to the center of the welding part 30. When the axial vibration of the intermediate connecting rod 20 drives the center of the welding part 30 to vibrate in the second direction, the outer peripheral edge of the welding part 30 vibrates in the first direction relative to the center of the welding part 30. In this way, in the process of reciprocating vibration, tensile vibration is generated at the circumference of the welding part 30.

[0036] In this embodiment, the connecting portion 10, the welding portion 30 and the middle connecting rod 20 are coaxially arranged to ensure structural stability and uniform amplitude.

[0037] Thus, in this embodiment, the structure provided by the welding head allows the welding portion 30 to generate circumferential tensile vibrations, and the working area of ​​the welding head is the circumferential portion of the welding portion 30. When welding between horizontal surfaces of some workpieces, the circumference of the welding portion 30 is pressed against the workpiece, and welding can be performed by the tensile vibrations generated by its circumference. Moreover, when welding the inner surfaces of some workpieces, the welding portion 30 of the welding head can extend into the inner side of the workpiece for welding, and because it generates circumferential tensile vibrations, for some workpieces with arc-shaped inner surfaces, multiple parts of the inner surface of the workpiece can be welded at the same time, and the welding effect is good and the efficiency is higher.

[0038] Please refer to Figure 1 and Figure 2 In one embodiment of the present invention, an annular protrusion 31 is arranged around the outer periphery of the welding portion 30 .

[0039] Specifically, the welding portion 30 has a first surface facing away from the middle connecting rod 20, the annular protrusion 31 is located at a position of the welding portion 30 close to the first surface, and the surface of the annular protrusion 31 facing away from the middle connecting rod 20 is flush with the first surface. The annular protrusion 31 reduces the thickness of the welding area of ​​the welding portion 30, making it easier to weld some difficult-to-weld locations, such as the inner surface of the workpiece mentioned above, and the generated circumferential tensile vibration effect is better.

[0040] In addition, a plurality of welding teeth 32 protruding away from the welding portion 30 are provided on the annular protrusion 31 .

[0041] In this way, the welding area of ​​the welding head becomes the welding tooth 32 protruding from the annular protrusion 31, which is more convenient for welding some narrow areas, and the generated circumferential tensile vibration, when transmitted to each welding tooth 32, has a better vibration effect compared to the protruding structure connected as one, thereby making the welding effect better.

[0042] Specifically, the upper and lower surfaces of the welding tooth 32 are flush with the upper and lower surfaces of the annular protrusion 31. The width of the welding tooth 32 gradually decreases in the direction away from the annular protrusion 31 to ensure its structural strength. In addition, in this embodiment, the end of the welding tooth 32 is arranged in a planar shape to ensure that it can stably fit with the workpiece and facilitate welding.

[0043] Furthermore, a plurality of welding teeth 32 are evenly spaced and arranged around the center of the welding portion 30 .

[0044] In this way, the vibration amplitudes of the plurality of welding teeth 32 of the welding portion 30 are uniform, so as to improve the welding effect.

[0045] Please refer to Figure 2 and Figure 3 In one embodiment of the present invention, the intermediate connecting rod 20 has a first connecting section 21 connected to the welding portion 30, and the diameter of the first connecting section 21 gradually increases along the direction from the intermediate connecting rod 20 to the welding portion 30.

[0046] The first connecting section 21 of the intermediate connecting rod 20 is connected to the welding portion 30. The structure of the welding portion 30 is stabilized by the structure of the gradually increasing diameter, and the intermediate connecting rod 20 is not easy to break. At the same time, the energy loss during the welding process is reduced.

[0047] Specifically, the side wall of the first connecting section 21 is an inwardly concave arc-shaped structure, which, on the one hand, makes the structure stable, and on the other hand, avoids the first connecting rod from directly contacting the workpiece surface, thereby not affecting the welding quality. In this embodiment, the first connecting section 21 extends to the periphery of the welding portion 30, so that the center of the welding portion 30 is thicker and the periphery is thinner, which makes it easier to generate circumferential tensile vibration to weld difficult-to-weld locations.

[0048] In addition, the welding portion 30 has a first surface facing away from the intermediate connecting rod 20 , a protrusion 40 protrudes from the center of the first surface of the welding portion 30 , and the diameter of the protrusion 40 gradually increases from the welding portion 30 to the protrusion 40 .

[0049] The raised portion 40 further makes the welding portion 30 thicker in the center and thinner in the periphery to generate circumferential tensile vibration. Similarly, the side wall of the raised portion 40 is also in an inwardly concave arc surface structure to facilitate welding. In addition, in this embodiment, the surface diameter of the raised portion 40 is the same as the middle diameter of the intermediate connecting rod 20, so that the middle of the welding portion 30 and the intermediate connecting rod 20 have the same vibration direction, and the periphery of the welding portion 30 generates circumferential tensile vibration.

[0050] Furthermore, the boss 40 has a tapered hole 40 a at the center.

[0051] The conical hole 40a is located on the surface of the protrusion 40 away from the welding part 30. The surface of the protrusion 40 is coaxial with the welding part 30. The surface of the protrusion 40 forms the conical hole 40a. Compared with the solid protrusion 40, the conical hole 40a is more conducive to the welding part 30 to generate circumferential tensile vibration. The conical hole here is connected to the connecting hole, and the bolt passes through the welding head and can be threadedly connected to the connecting column of the transducer. In addition, according to needs, the conical hole 40a can also be connected to another transducer 50 to increase the energy during welding.

[0052] Please refer to Figure 1 and Figure 2 In one embodiment of the present invention, the intermediate connecting rod 20 has a second connecting section 22 connected to the connecting portion 10, and the diameter of the second connecting section 22 gradually increases along the direction from the intermediate connecting rod 20 to the connecting portion 10.

[0053] The second connecting section 22 of the intermediate connecting rod 20 is connected to the connecting portion 10. The structure of the welding portion 30 is stable through the structure of gradually increasing diameter, and the intermediate connecting rod 20 is not easy to break. At the same time, the energy loss during the welding process is reduced. Specifically, the side wall of the second connecting section 22 is also an inwardly concave arc surface structure.

[0054] In addition, in this embodiment, an annular hole is formed on the top surface of the connecting part 10, which divides the inside and outside into an inner connecting column 11 and an outer connecting ring 12. A connecting hole 10a is provided on the connecting column 11 to achieve connection with the transducer 50. The amplitude is increased through the structure of the connecting part 10, so that the welding effect is better.

[0055] Please refer to Figure 1 and Figure 2 In one embodiment of the present invention, the connecting portion 10, the middle connecting rod 20 and the welding portion 30 are integrally formed. In this way, the vibration amplitude of the welding head is uniform and the welding effect is good.

[0056] Please refer to Figure 3The present invention also provides a welding device, including a transducer 50 for generating axial vibration and a welding head. The structure and function of the welding head can refer to the above embodiment and will not be repeated here.

[0057] Furthermore, one end of the transducer 50 has a connecting post 11 , which generates axial vibration along with the transducer 50 , and the connecting post 11 is fixed to a connecting hole 10 a on the top surface of the connecting portion 10 by threaded connection.

[0058] In this way, the transducer 50 can generate axial vibration, which in turn causes the welding head to generate axial vibration, and causes the welding portion 30 to generate circumferential tensile vibration, thereby achieving welding.

[0059] In another embodiment, a transducer 50 is also provided at the other end of the welding head, and the connecting column 11 of the transducer 50 is connected to the conical hole 40a of the welding head. By the two transducers 50 working simultaneously, the vibration effect generated is better and the welding effect is better.

[0060] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A welding head for generating circumferential tensile vibration, characterized in that: include: A connecting portion, the connecting portion having a top surface, a center of the top surface of the connecting portion having a connecting hole, the connecting hole being used for connecting and fixing with a transducer; An intermediate connecting rod, one end of which is connected to the center of the bottom surface of the connecting portion; A welding portion, the welding portion is in a disc shape, and the center of the welding portion is connected to the other end of the middle connecting rod; An annular protrusion is arranged around the outer periphery of the welding portion; a plurality of welding teeth protruding away from the welding portion are arranged on the annular protrusion; The welding portion has a first surface facing away from the intermediate connecting rod, a raised portion protrudes from the center of the first surface of the welding portion, and the diameter of the raised portion gradually increases along the direction from the welding portion to the raised portion; the side wall of the raised portion is an inwardly concave arc-shaped structure, and the surface diameter of the raised portion is the same as the middle diameter of the intermediate connecting rod; the center of the raised portion has a conical hole, and the conical hole is located on the surface of the raised portion facing away from the welding portion.

2. A welding head for generating circular tensile vibration as claimed in claim 1, characterized in that: The plurality of welding teeth are evenly spaced and arranged around the center of the welding portion.

3. A welding head for generating circular tensile vibration according to any one of claims 1 to 2, characterized in that: The intermediate connecting rod has a first connecting section connected to the welding portion, and the diameter of the first connecting section gradually increases along the direction from the intermediate connecting rod to the welding portion.

4. A welding head for generating circular tensile vibration according to any one of claims 1 to 2, characterized in that: The intermediate connecting rod has a second connecting section connected to the connecting portion, and the diameter of the second connecting section gradually increases along the direction from the intermediate connecting rod to the connecting portion.

5. A welding head for generating circular tensile vibration according to any one of claims 1 to 2, characterized in that: The connecting portion, the middle connecting rod and the welding portion are integrally formed.

6. A welding device, characterized in that: It includes a transducer that generates axial vibration and a welding head that generates circumferential tensile vibration as described in any one of claims 1 to 5, wherein one end of the transducer has a connecting column, the connecting column generates axial vibration along with the transducer, and the connecting column is fixed to the connecting hole on the top surface of the connecting part by a threaded connection.

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