Ultrasonic welding device

Abstract

The invention belongs to the technical field of ultrasonic welding, and particularly relates to an ultrasonic welding device which comprises a rack, a welding mechanism, a driving mechanism and a limiting mechanism. The welding mechanism is installed on the rack and arranged in the vertical direction, the welding mechanism comprises an ultrasonic triple set, the ultrasonic triple set comprises an ultrasonic welding head, and the ultrasonic welding head is arranged right opposite to the bottom die; the driving mechanism is mounted on the rack and comprises a driving part and an eccentric wheel assembly, the driving part is in transmission connection with the eccentric wheel assembly, the eccentric wheel assembly is in transmission connection with the welding mechanism, and the welding mechanism is in reciprocating motion in the vertical direction through rotation motion of the eccentric wheel assembly so as to improve the rhythm of reciprocating motion of the ultrasonic triple set; the limiting mechanism is installed on the welding mechanism and used for adjusting the position of the ultrasonic triple set in the vertical direction. The welding takt is improved, the defect that a high-pressure air cylinder is correspondingly provided with a high-power servo motor is overcome, and the size requirement of a welding machine for equipment is met.

Description

Technical Field

[0001] The present invention belongs to the technical field of ultrasonic welding, and particularly relates to an ultrasonic welding device. Background Art

[0002] Ultrasonic welding is a process that uses high-frequency vibration waves and stable pressure to achieve welding between two materials. As an advanced welding technology, its driving mechanism determines the welding rhythm, power, and stability. As a common driving component, the cylinder has the characteristics of simple structure, low cost, wide controllable pressure range, stable output pressure, etc., and is widely used in ultrasonic welding machine equipment.

[0003] With the diversification of welding products and product jigs, the pressure and stroke of the welding machine equipment have become the main factors restricting the welding rhythm. How to improve the movement speed of the driving structure is the main problem faced. Currently, in order to maintain the stability of the welding pressure and prevent the response of high-frequency vibration transmission, the original cylinder drive is still retained. The servo drives the cylinder to move at high speed until the welding head is about to approach the welding product, and the remaining stroke and the welding process are still completed by the cylinder. This requires the stroke and rated thrust of the electric cylinder to be greater than the cylinder stroke and the generated reaction force. However, there are still certain limitations in using this driving mechanism, and at least the following technical problems exist:

[0004] On the one hand, as the pressure and stroke of the welding machine increase, the power of the servo, the size of the mechanism, and the welding machine rhythm will also increase linearly, which conflicts with the development trend of miniaturization and lightweight of the welding machine. And due to the acceleration and deceleration of the electric cylinder and the movement of the cylinder, the welding rhythm has not been significantly improved; on the other hand, the welding machine structure has high requirements for installation accuracy, and the two floating joints added to the structure increase the instability of force transmission. This phenomenon is more significant in low-pressure welding machines. When the application scenario is low-pressure welding of 30 - 70 N, unstable power transmission is the main cause of the pressure drop phenomenon.

[0005] Based on this, it is necessary to improve the defects existing in the prior art to overcome the deficiencies existing in practical applications. Summary of the Invention

[0006] Based on the above-mentioned shortcomings and deficiencies existing in the prior art, one of the purposes of the present invention is to at least solve one or more of the above problems existing in the prior art. In other words, one of the purposes of the present invention is to provide an ultrasonic welding device that meets one or more of the foregoing requirements.

[0007] To achieve the above-mentioned invention purpose, the present invention adopts the following technical solutions:

[0008] The present invention provides an ultrasonic welding device, including:

[0009] A frame, on which a bottom mold is configured;

[0010] A welding mechanism is installed on the frame and arranged in the vertical direction, wherein the welding mechanism comprises an ultrasonic triple group, wherein the ultrasonic triple group comprises an ultrasonic welding head, and the ultrasonic welding head is arranged opposite to the bottom mold;

[0011] A driving mechanism is installed on the frame, the driving mechanism includes a driving part and an eccentric wheel assembly, the driving part is drivingly connected to the eccentric wheel assembly, the eccentric wheel assembly is drivingly connected to the welding mechanism, and the welding mechanism is linked to reciprocate in the vertical direction through the rotation of the eccentric wheel assembly, so as to improve the rhythm of the reciprocating motion of the ultrasonic triplet; and

[0012] A limiting mechanism is installed on the welding mechanism and is used to adjust the position of the ultrasonic triplet group in the vertical direction.

[0013] As a preferred solution, a reducer and a coupling are provided between the driving part and the eccentric wheel assembly, the driving part is transmission connected to the reducer, the reducer is transmission connected to the coupling, the coupling is transmission connected to the eccentric wheel assembly, and the eccentric wheel assembly is transmission connected to the welding mechanism.

[0014] As a preferred embodiment, the eccentric wheel assembly includes an eccentric shaft, a driving block and a slider, the driving block is sleeved on the eccentric shaft, the driving block is slidably connected to the slider, and the slider is connected to the welding mechanism; the eccentric shaft rotates to link the driving block to swing accordingly, and the driving block links the slider to move up and down.

[0015] As a preferred solution, one rotation of the eccentric shaft corresponds to the stroke of the reciprocating motion of the ultrasonic triplet.

[0016] As a preferred embodiment, the welding mechanism also includes a mounting frame, a cylinder, a clamping assembly, a fixed plate and a guide assembly, the mounting frame is connected to the eccentric wheel assembly, the clamping assembly is connected to the fixed plate, and the fixed plate is connected to the guide assembly; the cylinder is fixed to the mounting frame, the cylinder is transmission-connected to the clamping assembly, and the clamping assembly is used to clamp the ultrasonic welding head.

[0017] As a preferred solution, the guide assembly includes a guide rail and a guide block, the guide rail is arranged on the frame and arranged along the vertical direction, the guide block is connected to the fixed plate, and the guide block is slidably matched with the guide rail.

[0018] As a preferred solution, the clamping assembly includes a fixing seat and a clamp, the upper end of the fixing seat is in contact with the limiting mechanism, the fixing seat is connected to the clamp, and the clamp is tightly clamped to the ultrasonic welding head.

[0019] As a preferred solution, a floating joint and a pressure sensor are provided between the cylinder and the fixed seat. The cylinder is connected to the floating joint, the floating joint is connected to the pressure sensor, and the pressure sensor is connected to the fixed seat.

[0020] As a preferred solution, the limiting mechanism includes a limiting lead screw, a set screw, a limiting block and a stop block. The limiting lead screw is threadedly connected to the limiting block, the set screw is connected to the limiting lead screw, and the limiting block cooperates with the stop block to limit the ultrasonic triple group.

[0021] As a preferred solution, the ultrasonic triple group further includes a transducer and an amplitude modulator. The transducer is connected to the amplitude modulator, and the amplitude modulator is connected to the ultrasonic welding head.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] The present invention provides an ultrasonic welding device. The rotation of the eccentric shaft drives the ultrasonic welding head to reciprocate in the vertical direction, improving the welding machine rhythm. After the reaction force generated by the cylinder during the welding process is transmitted to the dead point position of the eccentric shaft, it is prevented from being further transmitted to the servo motor of the driving part. The rated torque of the servo motor only needs to meet the load requirement to achieve driving, which has nothing to do with the welding pressure. This not only improves the strength of the whole machine, but also avoids the defect that a large-pressure cylinder must correspond to a high-power servo motor, meeting the size requirements of high-speed welding machines for equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0025] Figure 1 is a schematic diagram of the overall structure of an ultrasonic welding device according to an embodiment of the present invention;

[0026] Figure 2 is a schematic diagram of the structure of the welding mechanism according to an embodiment of the present invention;

[0027] Figure 3 is a schematic diagram of the structure of the driving mechanism according to an embodiment of the present invention;

[0028] Figure 4 is a schematic diagram of the connection between the eccentric shaft and the driving block according to an embodiment of the present invention;

[0029] Figure 5 is a schematic diagram of the structure of the eccentric shaft according to an embodiment of the present invention;

[0030] Figure 6 Structural schematic diagram of the limit mechanism according to an embodiment of the present invention;

[0031] In the figure: 1 frame, 11 bottom die, 2 welding mechanism, 21 ultrasonic triple group, 211 ultrasonic welding head, 212 amplitude modulator, 213 transducer, 22 mounting bracket, 23 cylinder, 24 floating joint, 25 pressure sensor, 26 clamping assembly, 261 fixed seat, 262 hoop, 27 fixed plate, 28 guiding assembly, 281 guide rail, 282 guide block, 3 driving mechanism, 31 driving part, 32 speed reducer, 33 coupling, 34 eccentric wheel assembly, 341 eccentric shaft, 342 driving block, 343 slider, 344 slide rail, 345 fixed block, 346 bearing, 347 snap ring, 35 flange, 4 limit mechanism, 41 limit screw rod, 42 set screw, 43 limit block, 44 stop block. Detailed implementation manners

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the accompanying drawings required for the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some examples or embodiments of the present application. For those of ordinary skill in the art, without creative efforts, the present application can also be applied to other similar scenarios based on these drawings. Unless it is obvious from the language context or otherwise stated, the same reference numerals in the figures represent the same structure or operation.

[0033] Unless otherwise specifically stated, the relative arrangements of the components and steps described in these embodiments, numerical expressions and values do not limit the scope of the present application. At the same time, it should be understood that, for the convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationship. Technologies, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods and devices should be regarded as part of the authorization specification. In all the examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that: similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0034] In the description of the present application, it should be understood that the orientation or positional relationship indicated by orientation terms such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom", etc. is usually based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description. Without contrary instructions, these orientation terms do not indicate or imply that the device or component referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the protection scope of the present application; the orientation terms "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0035] In addition, it should be noted that the use of terms such as "first", "second", etc. to limit components is only for the convenience of distinguishing the corresponding components. Without additional statements, the above terms have no special meaning. Therefore, it should not be construed as a limitation on the protection scope of the present application. In addition, although the terms used in the present application are selected from well-known and commonly used terms, some terms mentioned in the specification of the present application may be selected by the applicant according to his or her judgment, and their detailed meanings are described in the relevant parts of the description herein. In addition, it is required to understand the present application not only through the actual terms used, but also through the meaning implied by each term.

[0036] According to some embodiments of the present application, please refer to Figures 1 to 6 As shown, there is provided an ultrasonic welding device, including a frame 1, a welding mechanism 2, a driving mechanism 3 and a limiting mechanism 4. A bottom mold 11 is arranged on the bottom surface of the frame 1 for supporting the workpiece to be welded; the welding mechanism 2 is installed on the frame 1 and is arranged along the vertical direction. The welding mechanism 2 includes an ultrasonic triple group 21, and the ultrasonic triple group 21 includes an ultrasonic welding head 211. The ultrasonic welding head 211 is disposed opposite to the bottom mold 11; the driving mechanism 3 is installed on the frame 1. The driving mechanism 3 includes a driving part 31 and an eccentric wheel assembly 34. The driving part 31 is in transmission connection with the eccentric wheel assembly 34. The eccentric wheel assembly 34 is in transmission connection with the welding mechanism 2. By the rotational movement of the eccentric wheel assembly 34, the welding mechanism 2 is driven to reciprocate in the vertical direction to improve the reciprocating movement rhythm of the ultrasonic triple group 21; the limiting mechanism 4 is installed on the welding mechanism 2 for adjusting the position of the ultrasonic triple group 21 in the vertical direction.

[0037] In some embodiments of the present application, a speed reducer 32 and a coupling 33 are provided between the driving part 31 and the eccentric wheel assembly 34. The driving part 31 is in transmission connection with the speed reducer 32, the speed reducer 32 is in transmission connection with the coupling 33, the coupling 33 is in transmission connection with the eccentric wheel assembly 34, and the eccentric wheel assembly 34 is in transmission connection with the welding mechanism 2. The driving part 31 is configured as a servo motor to ensure the control accuracy.

[0038] Specifically, the eccentric wheel assembly 34 includes an eccentric shaft 341, a driving block 342 and a slider 343. The driving block 342 is sleeved on the eccentric shaft 341. The driving block 342 is slidably connected to the slider 343. The slider 343 is connected to the welding mechanism 2. The eccentric shaft 341 rotates to link the driving block 342 to swing accordingly, and the driving block 342 links the slider 343 to move up and down.

[0039] Furthermore, the reducer 32 is connected to the coupling 33 through the flange 35, and the coupling 33 is connected to the eccentric shaft 341. The coupling 33 transmits power to the eccentric shaft 341 and the driving block 342. The driving block 342 is embedded in the groove of the slider 343 and drives the slider 343 to move linearly along the slide rail 344.

[0040] Furthermore, the fixing block 345 is connected to the side wall of the frame 1, and an elastic retaining ring 347 is provided between the eccentric shaft 341 and the fixing block 345, and the bearing 346 is clamped on the fixing block 345 by the elastic retaining ring 347 to limit the freedom of the eccentric shaft 341 in the front and rear directions.

[0041] Furthermore, one rotation of the eccentric shaft 341 corresponds to the reciprocating stroke of the ultrasonic triple group 21. The distance between the high point and the low point of the eccentric shaft 341 and the slider 343 is the stroke of the ultrasonic triple group from the initial position to the welding position, and one rotation of the eccentric shaft is the reciprocating stroke of the ultrasonic triple group.

[0042] In some embodiments of the present application, the welding mechanism 2 also includes a mounting frame 22, a cylinder 23, a clamping assembly 26, a fixed plate 27 and a guide assembly 28. The mounting frame 22 is connected to the eccentric wheel assembly 34, the clamping assembly 26 is connected to the fixed plate 27, and the fixed plate 27 is connected to the guide assembly 28; the cylinder 23 is fixed to the mounting frame 22, and the cylinder 23 is transmission-connected to the clamping assembly 26, and the clamping assembly 26 is used to clamp the ultrasonic welding head 211.

[0043] Furthermore, the guide assembly 28 includes a guide rail 281 and a guide block 282. The guide rail 281 is arranged on the frame 1 and arranged in the vertical direction. The guide block 282 is connected to the fixed plate 27. The guide block 282 slides with the guide rail 281. One side of the mounting frame 22 is fixedly connected to the slider 343, and the other side fixes the cylinder 23, thereby ensuring that the driving mechanism 3 drives the welding mechanism 2 and the sliding between the guide block 282 and the guide rail 281 causes the welding mechanism 2 to move in the vertical direction.

[0044] Furthermore, the clamping assembly 26 includes a fixing seat 261 and a clamp 262. The upper end of the fixing seat 261 abuts against the limiting mechanism 4. The fixing seat 261 is connected to the clamp 262. The clamp 262 clamps the ultrasonic welding head 211, thereby clamping and fixing the ultrasonic welding head to facilitate disassembly and installation of the ultrasonic welding head.

[0045] Furthermore, a floating joint 24 and a pressure sensor 25 are provided between the cylinder 23 and the fixed seat 261. The cylinder 23 is connected to the floating joint 24, the floating joint 24 is connected to the pressure sensor 25, and the pressure sensor 25 is connected to the fixed seat 261. The floating joint can eliminate the lateral force caused by the tilt or structural error of the welding mechanism in the vertical direction, avoid damage to the structure of the welding mechanism, and improve the service life of the ultrasonic welding machine. The pressure sensor is used to detect the pressure during the welding process, thereby ensuring stable output force control of the cylinder.

[0046] The cylinder is used as a power source to provide the required welding pressure for the welding product. In some embodiments, the cylinder can also be replaced by a linear motor. The power output end of the linear motor is connected to the ultrasonic triplex transmission to drive the ultrasonic triplex to move in the vertical direction. Using a linear motor as a power source can reduce the size of the welding machine, making the structure more compact and easy to carry and use.

[0047] In some embodiments of the present application, in order to limit and adjust the lowest point of the ultrasonic welding head moving in the vertical direction, so as to accurately control the height of the product to be welded after welding is completed, thereby ensuring the welding effect, the ultrasonic welding device is also equipped with a limiting mechanism 4, which includes a limiting screw rod 41, a top screw 42, a limiting block 43 and a stopper 44. The limiting screw rod is threadedly connected to the limiting block, the top screw is connected to the limiting screw rod, and the limiting block cooperates with the stopper to limit the ultrasonic triple group. One end of the limiting top screw 41 is fixed on the fixed seat 261, and the other end is threadedly matched with the limiting block 43, and the top screw 42 is used to prevent the limiting block from loosening. The stopper 44 is fixed on the mounting frame 22. When the limiting screw rod 41 and the ultrasonic triple group 21 move with each other, the limiting block 43 collides with the stopper 44 to play a limiting role.

[0048] Furthermore, the cylinder in this structure acts like a gas spring. When the eccentric shaft moves from a high point to a low point, the cylinder is compressed to ensure stable force control. The height of the welding position can be fine-tuned by adjusting the limit mechanism, thereby achieving compatibility with different welding heights.

[0049] In some embodiments of the present application, the ultrasonic triplet group further includes a transducer and an amplitude modulator, the output end of the transducer is connected to one end of the amplitude modulator, and the other end of the amplitude modulator is connected to the ultrasonic welding head.

[0050] The servo motor drives the eccentric shaft to move from the high point to the low point, so as to link the ultrasonic triple group to move from the initial position to the welding position, so that the ultrasonic welding head presses the product to be welded on the bottom mold, and the cylinder is compressed to provide stable welding pressure. The height of the welding position can be fine-tuned by adjusting the limit mechanism, so as to achieve compatibility with products to be welded with different welding heights.

[0051] In some embodiments of the present application, the rotation of the eccentric shaft drives the ultrasonic welding head to reciprocate in the vertical direction, improving the welding machine rhythm. After the reaction force generated by the cylinder during the welding process is transmitted to the dead point position of the eccentric shaft, it is prevented from being further transmitted to the servo motor of the driving part. The rated torque of the servo motor only needs to meet the load requirement to achieve driving, which has nothing to do with the welding pressure. This not only improves the strength of the whole machine but also avoids the defect that a large-pressure cylinder must correspond to a high-power servo motor, meeting the size requirements of the high-speed welding machine for the equipment.

[0052] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific situations.

[0053] The above is only a detailed description of the preferred embodiments and principles of the present application. For those of ordinary skill in the art, according to the idea provided by the present invention, there will be changes in the specific implementation manners, and these changes should also be regarded as the protection scope of the present application.

Claims

1. An ultrasonic welding device, characterized in that: include: A frame, wherein a bottom mold is arranged on the frame; A welding mechanism is installed on the frame and arranged in the vertical direction, wherein the welding mechanism comprises an ultrasonic triple group, wherein the ultrasonic triple group comprises an ultrasonic welding head, and the ultrasonic welding head is arranged opposite to the bottom mold; A driving mechanism is installed on the frame, the driving mechanism includes a driving part and an eccentric wheel assembly, the driving part is drivingly connected to the eccentric wheel assembly, the eccentric wheel assembly is drivingly connected to the welding mechanism, and the welding mechanism is linked to reciprocate in the vertical direction through the rotation of the eccentric wheel assembly, so as to improve the rhythm of the reciprocating motion of the ultrasonic triplet; and A limiting mechanism is installed on the welding mechanism and is used to adjust the position of the ultrasonic triplet group in the vertical direction.

2. An ultrasonic welding device according to claim 1, characterized in that: A reducer and a coupling are provided between the driving part and the eccentric wheel assembly. The driving part is transmission-connected to the reducer, the reducer is transmission-connected to the coupling, the coupling is transmission-connected to the eccentric wheel assembly, and the eccentric wheel assembly is transmission-connected to the welding mechanism.

3. The ultrasonic welding device according to claim 1, characterized in that: The eccentric wheel assembly includes an eccentric shaft, a driving block and a slider, wherein the driving block is sleeved on the eccentric shaft, the driving block is slidably connected to the slider, and the slider is connected to the welding mechanism; the eccentric shaft rotates to link the driving block to swing accordingly, and the driving block links the slider to move up and down.

4. An ultrasonic welding device according to claim 3, characterized in that: One rotation of the eccentric shaft corresponds to the stroke of the reciprocating motion of the ultrasonic triplet.

5. The ultrasonic welding device according to claim 1, characterized in that: The welding mechanism also includes a mounting frame, a cylinder, a clamping assembly, a fixed plate and a guide assembly. The mounting frame is connected to the eccentric wheel assembly, the clamping assembly is connected to the fixed plate, and the fixed plate is connected to the guide assembly; the cylinder is fixed to the mounting frame, the cylinder is transmission-connected to the clamping assembly, and the clamping assembly is used to clamp the ultrasonic welding head.

6. An ultrasonic welding device according to claim 5, characterized in that: The guide assembly comprises a guide rail and a guide block. The guide rail is arranged on the frame and arranged along the vertical direction. The guide block is connected to the fixing plate. The guide block is slidably matched with the guide rail.

7. The ultrasonic welding device according to claim 5, characterized in that: The clamping assembly includes a fixing seat and a clamping hoop. The upper end of the fixing seat is in contact with the limiting mechanism. The fixing seat is connected to the clamping hoop, and the clamping hoop is tightly clamped to the ultrasonic welding head.

8. The ultrasonic welding device according to claim 5, characterized in that: A floating joint and a pressure sensor are provided between the cylinder and the fixing seat, the cylinder is connected to the floating joint, the floating joint is connected to the pressure sensor, and the pressure sensor is connected to the fixing seat.

9. The ultrasonic welding device according to claim 1, characterized in that: The limiting mechanism includes a limiting screw, a top screw, a limiting block and a stopper. The limiting screw is threadedly connected to the limiting block, the top screw is connected to the limiting screw, and the limiting block cooperates with the stopper to limit the ultrasonic triple group.

10. The ultrasonic welding device according to claim 1, characterized in that: The ultrasonic triple group also includes a transducer and an amplitude modulator, the transducer is connected to the amplitude modulator, and the amplitude modulator is connected to the ultrasonic horn.

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