Bottom-mounted dual-drive ultrasonic welding head and welding device

Abstract

The welding head comprises a welding head body, a welding part, a zero point part, a zero point ejector pin, an ejector pin base, a first driving rod and a second driving rod, the welding part and the zero point part are located at the upper end and the lower end of the welding head body correspondingly, and the first driving rod and the second driving rod are both located on one side of the welding head body; the zero point ejector pin is arranged on the ejector pin base and inserted into the zero point part, so that a vibration zero point is formed on the lower portion of the zero point part, and the welding part swings and vibrates around the vibration zero point to weld a workpiece. The zero point ejector has a strong supporting effect on the welding part, the extreme value of the pressure capable of being borne by the welding head is greatly improved, at the moment, the pressure applied for improving the welding bonding strength can be borne, the amplitude of the wave generating assembly does not need to be increased to meet the welding requirement, and the phenomenon that the service life of the wave generating assembly is shortened is avoided. Meanwhile, the amplitude and power of the welding head are improved through the arrangement of the double driving rods, so that thicker or more layers of workpieces are welded, the welding range is greatly widened, and then the welding efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of ultrasonic welding, and in particular to a bottom-mounted dual-drive ultrasonic welding head and a welding device. Background Art

[0002] The metal ultrasonic welding device is a device that converts electrical energy into mechanical energy. It completes the welding of the workpiece by making the welding head vibrate at a high frequency and rub against the workpiece to generate the heat required for welding.

[0003] In the prior art, traditional vertical ultrasonic welding machines mostly use cantilever structures for welding. During the welding process, in order to ensure that the welding head and the workpiece are in full contact, a large pressure is usually used to continuously press the workpiece onto the welding head, which makes it easy for the horn and welding head to deform, resulting in poor welding effect of the workpiece. In order to deal with this problem, the amplitude of the wave generator is usually increased to increase the amplitude of the welding head and improve the welding effect, but this method will seriously shorten the life of the wave generator, making it easy for cracks or even fractures to appear inside, increasing the frequency of equipment maintenance and high maintenance costs, which needs to be improved. Utility Model Content

[0004] In order to solve the technical problem of the short life of the wave generating component of the prior art neutral ultrasonic welding machine due to unreasonable structural layout, the present application provides a bottom-mounted dual-drive ultrasonic welding head and a welding device.

[0005] On the one hand, this application provides the following technical solutions:

[0006] A bottom-mounted dual-drive ultrasonic welding head comprises a welding head body, a welding part, a zero point part, a zero point ejector, an ejector seat, a first driving rod and a second driving rod, wherein the welding part and the zero point part are respectively located at the upper and lower ends of the welding head body, the first driving rod and the second driving rod are both located on one side of the welding head body, the zero point ejector is arranged on the ejector seat and inserted into the zero point part so that the lower part of the zero point part forms a vibration zero point, the first driving rod and the second driving rod are used to be connected to an external amplitude rod, and drive the welding part to swing and vibrate around the vibration zero point through vibration to weld a workpiece.

[0007] By adopting the above technical scheme, the welding part and the zero point part are set at the upper and lower ends of the welding head body of the present application, and the zero point pin is inserted into the zero point part to form a vibration zero point at the lower part of the zero point part, and the welding part can only rotate around the vibration zero point; when the first driving rod and the second driving rod located on the side are driven to vibrate by the external amplitude rod, the welding part will be driven to swing around the vibration zero point, and the workpiece can be welded by using the vibration energy. Since the zero point pin has a strong supporting effect on the welding part, the welding head is no longer a cantilever structure, which greatly improves the extreme value of the pressure that the welding head can withstand, and the deformation is still very small under the condition of extremely large pressure, which can increase the welding pressure applied to the workpiece, ensure the bonding strength between the workpiece and the uniformity of the welding point pressure, ensure the welding effect, and also improve the welding efficiency; since it is no longer necessary to deliberately increase the amplitude of the wave generating component to meet the welding requirements, the shortening of the life of the wave generating component is avoided, and the maintenance cost is reduced; the present application also ensures the amplitude and power of the lower welding head by setting a double driving rod to weld workpieces of greater thickness or more layers of workpieces, greatly improving the weldable range of the workpiece, thereby improving the welding efficiency.

[0008] Preferably, a positioning hole is provided on the bottom surface of the zero-point portion, and the zero-point ejector pin is inserted into the positioning hole.

[0009] Preferably, two opposite side surfaces of the zero-point portion are provided with positioning holes, and the zero-point ejector pin is inserted into the positioning holes.

[0010] Preferably, arc-shaped grooves are provided at the joints between the first driving rod, the second driving rod and the welding head body, so as to reduce the rigidity of the joints.

[0011] By adopting the above technical solution, after the strength of the joint between the first driving rod, the second driving rod and the welding head body becomes weaker, the welding part is easier to swing, which can reduce the loss of ultrasonic energy.

[0012] Preferably, the first driving rod and the second driving rod are both arranged horizontally, and the first driving rod and the second driving rod are parallel to each other.

[0013] Preferably, the first driving rod and the second driving rod are both arranged horizontally, and there is an angle between the first driving rod and the second driving rod, and the angle is 5 to 15 degrees.

[0014] Preferably, the welding head body, the welding part, the zero point part, the first driving rod and the second driving rod are integrally processed.

[0015] By adopting the above technical solutions, the strength and durability of the welding head are improved.

[0016] On the other hand, another technical solution provided by the present application is: a welding device using a bottom-mounted dual-drive ultrasonic welding head, comprising the bottom-mounted dual-drive ultrasonic welding head, a main mounting plate, a pressure welding head, a lifting mechanism, a first amplitude rod, a second amplitude rod, a first amplitude rod mounting seat, a second amplitude rod mounting seat, a first transducer and a second transducer; the ejector seat, the first amplitude rod mounting seat and the second amplitude rod mounting seat are all arranged on the main mounting plate, the first amplitude rod is arranged on the first amplitude rod mounting seat, one end of which is connected to the first drive rod, and the other end is connected to the first transducer, the second amplitude rod is arranged on the second amplitude rod mounting seat, one end of which is connected to the second drive rod, and the other end is connected to the second transducer; the lifting mechanism is used to drive the pressure welding head to rise and fall so as to press the workpiece between the pressure welding head and the welding part.

[0017] The welding head of this application adopts a bottom-mounted structure and cannot be raised or lowered, so it is necessary to set a pressure welding head that can be pressed down to press the workpiece between the pressure welding head and the welding part. Since the welding part is supported by the zero-point ejector pin, the deformation is still very small under very high pressure, thereby ensuring the bonding strength between the workpiece and the uniformity of the welding point pressure, thereby ensuring the welding effect. This application also sets a double amplitude rod and a double transducer, which are connected to the first drive rod and the second drive rod to ensure the amplitude and power of the bottom-mounted welding head, greatly improving the weldable range of the workpiece.

[0018] In summary, the present application includes at least one of the following beneficial effects:

[0019] 1. The zero-point pin of the present application has a strong supporting effect on the welding part. The welding head is no longer a cantilever structure, which greatly increases the extreme value of the pressure that the welding head can withstand, and can increase the welding pressure applied to the workpiece, ensure the bonding strength between the workpiece and the uniformity of the welding point pressure, and ensure the welding effect;

[0020] 2. Since it is no longer necessary to deliberately increase the amplitude of the wave generator to meet welding requirements, the life of the wave generator is avoided from being shortened and maintenance costs are reduced;

[0021] 3. The present application also ensures the amplitude and power of the lower welding head by setting up a double driving rod, so as to weld workpieces with greater thickness or more layers, greatly increasing the weldable range of the workpiece and thus improving the welding efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a stereoscopic diagram of the bottom-mounted dual-drive ultrasonic welding head described in Example 1 of the present application;

[0023] Figure 2 It is a side view of the bottom-mounted dual-drive ultrasonic welding head described in Example 1 of the present application;

[0024] Figure 3 yes Figure 2Middle AA section view;

[0025] Figure 4 is a three-dimensional diagram of the welding device described in Example 2 of the present application;

[0026] Figure 5 It is a schematic diagram of the coordination relationship of some components in the welding device described in Example 2 of the present application.

[0027] Explanation of the reference numerals in the accompanying drawings: 1. ultrasonic welding head; 11. welding head body; 12. welding part; 13. zero point part; 14. zero point ejector pin; 15. ejector pin seat; 16. first driving rod; 17. second driving rod; 18. positioning hole; 19. arc-shaped groove; 2. main mounting plate; 3. pressure welding head; 4. lifting mechanism; 5. first amplitude transformer; 6. second amplitude transformer; 7. first amplitude transformer mounting seat; 8. second amplitude transformer mounting seat; 9. first transducer; 10. second transducer. DETAILED DESCRIPTION

[0028] The following is combined with Figure 1 -Attached Figure 5 This application is described in further detail.

[0029] Embodiment 1:

[0030] Reference Figures 1 to 3 The present embodiment discloses a bottom-mounted dual-drive ultrasonic welding head, comprising a welding head body 11, a welding portion 12, a zero point portion 13, a zero point ejector 14, an ejector seat 15, a first driving rod 16 and a second driving rod 17, wherein the welding portion 12 and the zero point portion 13 are respectively located at the upper and lower ends of the welding head body 11, the first driving rod 16 and the second driving rod 17 are both located on one side of the welding head body 11, the zero point ejector 14 is arranged on the ejector seat 15 and inserted into the zero point portion 13, so that a vibration zero point is formed at the lower part of the zero point portion 13, the first driving rod 16 and the second driving rod 17 are used to be connected to an external amplitude rod, and drive the welding portion 12 to swing and vibrate around the vibration zero point through vibration to weld the workpiece.

[0031] Reference Figure 3 The bottom surface of the zero-point portion 13 is provided with a positioning hole 18 for inserting the zero-point ejector pin 14 to form a vibration zero point at the zero-point portion 13, so that the welding portion 12 can only rotate around the vibration zero point. In this embodiment, the zero-point ejector pin 14 is inserted into the positioning hole 18 on the bottom surface of the zero-point portion 13, and the zero-point ejector pin 14 has a strong supporting effect on the welding portion 12. At this time, the ultrasonic welding head 1 is no longer a cantilever structure, which can greatly increase the extreme value of the pressure that the welding head can withstand.

[0032] Reference Figure 3The positioning holes 18 may also be provided on two opposite sides of the zero point portion 13. At this time, the zero point ejector pin 14 is inserted to form a vibration zero point at the zero point portion 13, so that the welding portion 12 can only rotate around the vibration zero point.

[0033] Reference Figure 1 and Figure 2 The joints of the first driving rod 16, the second driving rod 17 and the welding head body 11 are dug with arc grooves 19 in the upper and lower directions. The arc grooves 19 are used to weaken the rigidity of the joints so that the welding head body can swing and vibrate more easily.

[0034] Reference Figure 1 The first driving rod 16 and the second driving rod 17 are both arranged horizontally and at an angle, and the angle is preferably 5 to 15 degrees; after the two driving rods are installed with the horn, when the horn is installed and fixed, the horn installation structure has enough space for installation. In the application, it is also feasible that the first driving rod and the second driving rod are parallel to each other.

[0035] Reference Figures 1 to 3 The welding head body 11, the welding part 12, the zero point part 13, the first driving rod 16 and the second driving rod 17 are integrally processed, which can improve the strength and durability of the welding head.

[0036] The welding part 12 and the zero point part 13 are arranged at the upper and lower ends of the welding head body 11 of the present application, and the zero point pin 14 is inserted into the zero point part 13 to form a vibration zero point at the lower part of the zero point part 13, and the welding part 12 can only rotate around the vibration zero point; when the first driving rod 16 and the second driving rod 17 located on the side are driven to vibrate by the external amplitude rod, the welding part 12 will be driven to swing and vibrate around the vibration zero point, and the vibration energy can be used to weld the workpiece. Since the zero-point ejector pin 14 has a strong supporting effect on the welding portion 12, the ultrasonic welding head is no longer a cantilever structure, which greatly increases the maximum pressure that the welding head can withstand, and the deformation is still very small under very large pressure, which can increase the welding pressure applied to the workpiece, ensure the bonding strength between the workpiece and the uniformity of the welding point pressure, ensure the welding effect, and also improve the welding efficiency; since there is no need to deliberately increase the amplitude of the wave generating component to meet the welding requirements, the shortening of the life of the wave generating component is avoided and the maintenance cost is reduced; the present application also ensures the amplitude and power of the ultrasonic welding head 1 by setting a dual drive rod to weld workpieces of greater thickness or workpieces with more layers, greatly increasing the weldable range of the workpiece, thereby improving the welding efficiency.

[0037] Embodiment 2:

[0038] Reference Figure 4 and Figure 5The present embodiment provides a welding device, comprising the bottom-mounted dual-drive ultrasonic welding head 1, the main mounting plate 2, the pressure welding head 3, the lifting mechanism 4, the first amplitude rod 5, the second amplitude rod 6, the first amplitude rod mounting seat 7, the second amplitude rod mounting seat 8, the first transducer 9 and the second transducer 10 described above; the ejector seat 15, the first amplitude rod mounting seat 7 and the second amplitude rod mounting seat 8 are all arranged on the main mounting plate 2, the first amplitude rod 5 is arranged on the first amplitude rod mounting seat 7, one end is connected to the first driving rod 16, and the other end is connected to the first transducer 9, the second amplitude rod 6 is arranged on the second amplitude rod mounting seat 8, one end is connected to the second driving rod 17, and the other end is connected to the second transducer 10; the lifting mechanism 4 is used to drive the pressure welding head 3 to rise and fall, so as to press the workpiece between the pressure welding head 3 and the welding part 12.

[0039] The ultrasonic welding head 1 of the present application adopts a bottom-mounted structure and cannot be raised or lowered, so it is necessary to set a pressure welding head 3 that can be pressed down to press the workpiece between the pressure welding head 3 and the welding part 12. Since the welding part 12 is supported by the zero-point ejector pin 14, the deformation is still very small under the condition of very large pressure, thereby ensuring the bonding strength between the workpiece and the uniformity of the welding point pressure, thereby ensuring the welding effect. The present application also sets a double amplitude rod and a double transducer, which are connected to the first drive rod 16 and the second drive rod 17 to ensure the amplitude and power of the bottom-mounted welding head, thereby greatly improving the weldable range of the workpiece.

[0040] The welding device of the present application will sequentially go through an ultrasonic welding stage and a pressure unloading stage during welding.

[0041] During the ultrasonic welding stage, the welding can be performed in two modes: energy mode and time mode. The energy mode can set the parameters for welding amplitude, welding energy and welding pressure, while the time mode can set the parameters for welding amplitude, welding time and welding pressure. After setting, the workpiece will be welded according to the preset mode and parameters. The welding amplitude can be set in the range of 0 to 120 microns, the welding energy can be set in the range of 0 to 2000 joules, the welding pressure can be set in the range of 0 to 0.6 MPa, and the welding time can be set in the range of 0 to 5 seconds.

[0042] In the pressure unloading stage, that is, after the ultrasonic welding stage is completed, the lifting mechanism 4 drives the pressure welding head 3 to lift up. At this time, secondary ultrasound is performed according to preset parameters, so that the ultrasonic welding head 1 and the pressure welding head 3 are separated from the workpiece under the action of vibration to prevent the two from sticking to the workpiece.

[0043] The present application is a dual-drive single welding head, and the ultrasonic welding head 1 has a large welding area. At the same time, there is a zero-point pin 14 inserted into the positioning hole 18 to form a vibration zero point at the zero point portion 13. The double amplitude rod is used to transmit vibration to increase the longitudinal vibration of the ultrasonic welding head 1. At this time, the front end welding head body 11 of the ultrasonic welding head 1 performs bending vibration around the vibration zero point to achieve the conversion of longitudinal vibration to bending vibration. During longitudinal vibration, the vibration node is a fixed intercept point perpendicular to the longitudinal wave transmission direction, while the vibration node is a line segment during bending vibration. Specifically, for the ultrasonic welding head 1 described in Example 1, when the welding head vibrates, the vibration node, i.e., the zero-point pin 14 inserted into the positioning hole 18 forms a vibration zero point at the zero point portion 13, which is relatively static. At this time, the farther the welding head body 11 is from the vibration node area, the greater the vibration amplitude.

[0044] The welding head body 11 of this embodiment has two pairs of positioning holes 18, among which the positioning holes 18 located on the bottom surface are more stable than the positioning holes 18 located on both sides during use. At this time, the positioning holes 18 located on both sides can be used as auxiliary functional structures. When the zero-point ejector pin 14 is inserted into the positioning hole 18 located on the bottom surface, the positioning holes 18 located on both sides are also equipped with zero-point ejector pins 14 for insertion, thereby further increasing the stability of the welding head body 11 and improving the welding effect.

[0045] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A bottom-mounted dual-drive ultrasonic welding head, characterized in that: The invention comprises a welding head body (11), a welding portion (12), a zero point portion (13), a zero point ejector pin (14), an ejector pin seat (15), a first driving rod (16) and a second driving rod (17); the welding portion (12) and the zero point portion (13) are respectively located at the upper and lower ends of the welding head body (11); the first driving rod (16) and the second driving rod (17) are both located at one side of the welding head body (11); the zero point ejector pin (14) is arranged on the ejector pin seat (15) and inserted into the zero point portion (13) so that a vibration zero point is formed at the lower part of the zero point portion (13); the first driving rod (16) and the second driving rod (17) are used to be connected to an external amplitude changing rod and drive the welding portion (12) to swing around the vibration zero point through vibration so as to weld a workpiece.

2. The bottom-mounted dual-drive ultrasonic horn according to claim 1, characterized in that: The bottom surface of the zero point portion (13) is provided with a positioning hole (18), and the zero point ejector pin (14) is inserted into the positioning hole (18).

3. The bottom-mounted dual-drive ultrasonic horn according to claim 1, characterized in that: Two opposite side surfaces of the zero point portion (13) are provided with positioning holes (18), and the zero point ejector pin (14) is inserted into the positioning holes (18).

4. The bottom-mounted dual-drive ultrasonic horn according to claim 1, characterized in that: The joints between the first driving rod (16), the second driving rod (17) and the welding head body (11) are each provided with an arc-shaped groove (19) for reducing the rigidity of the joint.

5. The bottom-mounted dual-drive ultrasonic horn according to claim 1, characterized in that: The first driving rod (16) and the second driving rod (17) are both arranged horizontally, and the first driving rod (16) and the second driving rod (17) are parallel to each other.

6. The bottom-mounted dual-drive ultrasonic horn according to claim 1, characterized in that: The first driving rod (16) and the second driving rod (17) are both arranged horizontally, and there is an angle between the first driving rod (16) and the second driving rod (17), and the angle is 5 to 15 degrees.

7. The bottom-mounted dual-drive ultrasonic horn according to claim 1, characterized in that: The welding head body (11), the welding portion (12), the zero point portion (13), the first driving rod (16) and the second driving rod (17) are integrally processed.

8. A welding device using a bottom-mounted dual-drive ultrasonic welding head, characterized in that: The invention comprises a bottom-mounted dual-drive ultrasonic welding head (1) according to any one of claims 1 to 7, a main mounting plate (2), a pressure welding head (3), a lifting mechanism (4), a first amplitude rod (5), a second amplitude rod (6), a first amplitude rod mounting seat (7), a second amplitude rod mounting seat (8), a first transducer (9) and a second transducer (10); the ejector seat (15), the first amplitude rod mounting seat (7) and the second amplitude rod mounting seat (8) are all arranged on the main mounting plate (2); the first amplitude rod (5) is arranged on the first amplitude rod mounting seat (7), one end of which is connected to the first driving rod (16) and the other end is connected to the first transducer (9); the second amplitude rod (6) is arranged on the second amplitude rod mounting seat (8), one end of which is connected to the second driving rod (17) and the other end is connected to the second transducer (10); the lifting mechanism (4) is used to drive the pressure welding head (3) to rise and fall so as to press the workpiece between the pressure welding head (3) and the welding part (12).

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