Ultrasonic welding device

Abstract

The present invention discloses an ultrasonic welding device, comprising: a gripping portion; a welding unit including a welding head, the welding head being fixedly connected to the gripping portion; and a balancing unit including a balancing cylinder, a balancing pin, and a pre-locking structure. The balancing cylinder is sleeved radially outward of the welding head and is movable relative to the gripping portion in a first direction. The balancing cylinder is further provided with at least three movable channels extending in the first direction, the at least three movable channels being spaced apart along the circumference of the balancing cylinder. The balancing pins correspond to the movable channels and are movably disposed in the corresponding movable channels in the first direction. The pre-locking structure detachably contacts the balancing pins to lock or unlock the balancing cylinder. When the multiple balancing pins are in contact with a workpiece and subjected to a thrust in the first direction, the pre-locking structure unlocks the balancing cylinder, allowing the balancing cylinder to move in the first direction under the thrust of the workpiece, exposing the welding head. The ultrasonic welding device of the present invention can meet the low-cost and short-cycle production requirements of the early structural verification stage of a product.

Description

Technical Field

[0001] The present invention relates to the field of welding equipment, in particular to an ultrasonic welding device. Background Art

[0002] For products requiring high weld strength and surface quality, traditional ultrasonic welding typically relies on robots or specialized welding equipment. These devices are complex in structure and require high operator skills during commissioning, resulting in high investment costs and long commissioning cycles. During the early stages of product verification, robots or specialized welding equipment cannot meet the low-cost, short-cycle requirements, making it difficult to ensure stable supply for small-batch production.

[0003] While conventional handheld ultrasonic welding equipment reduces equipment costs and debugging difficulties to a certain extent, it often leads to high product scrap rates due to the operator's difficulty in precisely controlling the welding direction during the welding process. This situation is particularly prominent during the early stages of product structural verification, as specialized equipment has not yet been developed and handheld equipment cannot meet quality requirements. This leads to extended project verification cycles, increased verification costs, and significant waste. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one objective of the present invention is to provide an ultrasonic welding device in which a pre-locking structure unlocks the balancing pin only when the balancing cylinder is aligned with the workpiece surface, allowing the welding head to be exposed from the balancing cylinder for welding. This facilitates alignment, facilitating the operator's ability to align the ultrasonic welding device's welding direction with the workpiece surface, improving welding quality and efficiency, and thus meeting the low-cost, short-cycle production requirements of the product's early structural verification phase.

[0005] An embodiment of the present invention provides an ultrasonic welding device, comprising: a gripping portion;

[0006] A welding unit, comprising a welding head, the welding head being used to weld a workpiece, the welding head being fixedly connected to the holding portion;

[0007] A balancing unit includes a balancing cylinder, a balancing needle, and a pre-locking structure. The balancing cylinder is sleeved on the radially outer side of the welding head and is movable relative to the gripping portion in a first direction. The balancing cylinder is further provided with at least three movable channels extending in the first direction. The at least three movable channels are arranged at intervals along the circumference of the balancing cylinder. The balancing needle corresponds to the movable channels and is movably provided in the corresponding movable channels in the first direction. The pre-locking structure detachably contacts the balancing needle to lock or unlock the balancing cylinder.

[0008] The balancing unit is configured to unlock from the pre-locking structure and retract into the movable channel when the plurality of balancing pins are in contact with the workpiece and are subjected to a thrust along the first direction, so that the balancing cylinder moves along the first direction under the thrust of the workpiece, exposing the welding head.

[0009] The ultrasonic welding device of the present invention has at least three movable channels with balancing pins. When all balancing pins are in contact with the workpiece and subjected to a thrust in a first direction, the "three-point plane" principle determines that the front ends of the multiple balancing pins are flush with the workpiece surface, and the direction of their contraction, i.e., the first direction, is perpendicular to the workpiece surface. Only then will the balancing cylinder move in the first direction away from the welding head, allowing the welding head to proceed. This ensures that the welding head, under the action of thrust, will only weld the workpiece in the first direction, ensuring a consistent welding direction. The operator simply needs to adjust the tilt angle of the ultrasonic welding device. When all balancing pins are aligned with the workpiece surface and contract along the movable channels, the welding direction is confirmed to be aligned. This convenient alignment operation helps improve welding efficiency, thereby meeting the low-cost, short-cycle production requirements of the product's early structural verification phase.

[0010] In some embodiments, the balancing unit further includes: a mounting cylinder, one end of the mounting cylinder being fixedly connected to the holding portion, the inner side of the mounting cylinder defining a mounting cavity extending along a first direction, the balancing cylinder being movably disposed in the mounting cavity along the first direction, the balancing cylinder being provided with a first locking hole extending radially through the movable channel and the outer peripheral wall of the balancing cylinder, the pre-locking structure being movably disposed in the first locking hole and detachably contacting the balancing needle.

[0011] According to some embodiments of the present invention, a second locking hole is provided on the mounting tube, which is radially opposite to and connected to the first locking hole, and part of the pre-locking structure is also located in the second locking hole.

[0012] According to some embodiments of the present invention, the pre-locking structure includes a locking member and a first elastic member, a locking groove is provided on the balance needle, the locking member can extend into or exit the locking groove, the first elastic member is in the second locking hole, one end of the first elastic member is connected to the locking member, and the other end is connected to the mounting tube.

[0013] Further, the locking member includes a first locking portion and a second locking portion, the first locking portion is slidably arranged in the first locking hole, and the second locking portion is slidably arranged in the second locking hole, and the second locking portion is constructed so that when the locking member locks the balancing cylinder, one end of the second locking portion facing the first locking portion is located in the first locking hole, and when the locking member unlocks the balancing cylinder, one end of the second locking portion facing the first locking portion is located in the second locking hole.

[0014] In some embodiments, a second elastic member is provided in the movable channel, and two ends of the second elastic member are respectively connected to the balancing needle and the cavity wall of the movable channel.

[0015] In some embodiments, the cavity wall of the mounting cavity protrudes radially inward to form a first protrusion, the outer wall of the balancing cylinder protrudes radially outward to form a second protrusion, the first protrusion and the second protrusion are opposite to each other along the first direction, and the ultrasonic welding device also includes: a third elastic member, the two ends of the third elastic member are respectively connected to the two side surfaces of the first protrusion and the second protrusion opposite to each other along the first direction.

[0016] In some embodiments, the balancing unit further includes: a limit member, which is disposed in the mounting cavity and located on the side of the balancing cylinder facing the gripping portion, and the limit member is constructed so that when the welding head is welded to a set depth, the balancing cylinder abuts against the limit member.

[0017] According to some embodiments of the present invention, the limiting member defines a second through hole, the welding head is passed through the second through hole, and the diameter of the second through hole is smaller than the outer diameter of the welding head.

[0018] According to some embodiments of the present invention, a first internal thread is provided on the cavity wall of the installation cavity, a first external thread is provided on the outer wall of the limiting member, and the limiting member is threadably matched with the installation tube.

[0019] According to some embodiments of the present invention, the limiting member includes a first limiting section and a second limiting section, the first limiting section is provided with the first external thread, the second limiting section is spaced apart from the inner wall of the mounting cavity, and the outer wall of the second limiting section is circumferentially arranged with adjustment teeth, the mounting tube is provided with an adjustment hole passing through the cavity wall of the mounting cavity, the adjustment hole is opposite to the adjustment tooth, and the adjustment hole extends along the circumference of the mounting tube, the balancing unit also includes an adjustment rod, the adjustment rod has an insertion end matching the adjustment tooth, the insertion end is inserted into the adjustment tooth through the adjustment hole, and rotates along the adjustment hole to drive the limiting member to rotate.

[0020] In some embodiments, a receiving cavity with an open end is provided on the inner side of the gripping portion, and the welding unit further includes a transducer, which is fixedly mounted in the receiving cavity, and the welding head is fixedly connected to the transducer, and the welding head extends from the receiving cavity.

[0021] Furthermore, the accommodating cavity is provided with a fixing part, and the transducer is fixedly installed in the accommodating cavity through the fixing part. The outer wall of the fixing part is provided with a second external thread, and the inner wall of the accommodating cavity is provided with a second internal thread. The fixing part is threadedly connected to the inner wall of the accommodating cavity, and a third through hole is opened on the fixing part, and the welding head passes through the third through hole.

[0022] In some embodiments, the ultrasonic welding device is further provided with an air flow channel, which passes through the gripping portion and the balancing unit. One end of the air flow channel is connected to a purge device, and the other end extends to the end of the balancing cylinder away from the gripping portion.

[0023] Furthermore, an air pipe connecting port is provided at one end of the gripping portion away from the balancing cylinder, and the air pipe connecting port is communicated with the air flow channel.

[0024] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0026] Figure 1 1 is a schematic structural diagram of an ultrasonic welding device according to an embodiment of the present invention;

[0027] Figure 2 yes Figure 1 Schematic diagram of the cross-sectional structure at AA in the middle;

[0028] Figure 3 yes Figure 2 Schematic diagram of the enlarged structure at B in the middle;

[0029] Figure 4 yes Figure 1 Schematic diagram of the cross-sectional structure at CC in the middle;

[0030] Figure 5 is a diagram showing a state in which multiple balancing pins of an ultrasonic welding device according to an embodiment of the present invention are in contact and aligned with a workpiece surface;

[0031] Figure 6This is a diagram showing a state in which the pre-locking structure of the ultrasonic welding device according to an embodiment of the present invention unlocks multiple balancing pins to allow the balancing cylinder to move relative to the gripping portion to expose the welding head for welding;

[0032] Figure 7 This is a diagram showing a state in which the welding head of the ultrasonic welding device according to an embodiment of the present invention welds to a set depth;

[0033] Figure 8 2 is a schematic structural diagram of a holding portion of an ultrasonic welding device according to an embodiment of the present invention.

[0034] Reference numerals:

[0035] 100-ultrasonic welding device;

[0036] 110 - gripping portion; 111 - accommodating cavity; 1111 - second internal thread; 112 - fixing member; 1121 - second external thread;

[0037] 120- welding unit; 121- welding head; 122- transducer;

[0038] 130 - Balancing unit; 131 - Balancing cylinder; 131a - Active channel; 1311 - Second elastic member; 1312 - Second protrusion; 132 - Balancing needle; 1321 - Locking groove; 133 - Pre-locking structure; 1331 - Locking member; 1331a - First locking portion; 1331b - Second locking portion; 1332 - First elastic member; 134 - Mounting cylinder; 1341 - Mounting cavity; 1341a - First internal thread; 1343 - First protrusion; 135 - Limiting member; 135a - First limiting section; 135b - Second limiting section; 135c - Adjusting tooth; 1351 - Second through hole; 1352 - First external thread;

[0039] 140- third elastic member;

[0040] 150-Trachea connection port. DETAILED DESCRIPTION

[0041] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0042] Reference below Figures 1 to 8, describing an ultrasonic welding device 100 according to an embodiment of the present invention. The ultrasonic welding device 100 according to the present invention can be a handheld device, which is convenient for an operator to manually and quickly align the welding head 121 with the workpiece surface, while ensuring the welding quality while quickly welding, thereby meeting the low-cost and short-cycle production requirements of small batch products for early product structure verification.

[0043] refer to Figure 1 、 Figure 2 and Figure 3 The ultrasonic welding device 100 may include a gripping portion 110 , a welding unit 120 and a balancing unit 130 .

[0044] The gripping portion 110 may be a columnar structure, so that the operator can hold it during welding. During the welding process, the operator applies a thrust to the ultrasonic welding device 100 through the gripping portion 110 to perform welding.

[0045] refer to Figure 1 The welding unit 120 may include a welding head 121, which is an ultrasonic welding head. The welding head 121 is used to weld the workpiece. The welding head 121 is fixedly connected to the holding portion 110. When the holding portion 110 is pushed, the welding head 121 moves synchronously.

[0046] refer to Figure 3 The balancing unit 130 may include a balancing cylinder 131, a balancing needle 132, and a pre-locking structure 133. The balancing cylinder 131 may be directly connected to the gripping portion 110, or may be installed on the gripping portion 110 through an intermediate mounting member (such as the mounting cylinder 134 described below). The balancing cylinder 131 is sleeved on the radially outer side of the welding head 121, and is movable relative to the gripping portion 110 along a first direction. For example, the balancing cylinder 131 may slide and retract relative to the gripping portion 110 along the first direction, or the balancing cylinder 131 may be threadedly engaged with the gripping portion 110, that is, the balancing cylinder 131 may rotate relative to the gripping portion 110, and may also move relative to the gripping portion 110 in the first direction. The first direction may be the axial direction of the ultrasonic welding device 100, such as Figure 1 In this way, when the ultrasonic welding device 100 is not used for welding, the balancing cylinder 131 can protect the inner welding head 121. When the ultrasonic welding device 100 is used for welding, the balancing cylinder 131 can be moved along the first direction to expose the welding head 121 for contact with the workpiece.

[0047] refer to Figure 1 、 Figure 2 and Figure 3The balancing cylinder 131 is further provided with at least three movable channels 131a extending in a first direction. The at least three movable channels 131a are spaced apart along the circumference of the balancing cylinder 131. The balancing pins 132 correspond to the movable channels 131a and are movable in the corresponding movable channels 131a along the first direction. The pre-locking structure 133 detachably contacts the balancing pins 132 to lock or unlock the balancing cylinder 131. For example, three movable channels 131a may be provided, spaced 120° apart around the circumference of the balancing cylinder 131. The three balancing pins 132 are also provided, and three pre-locking structures 133 are provided corresponding to the balancing pins 132. When the pre-locking structures 133 contact the balancing pins 132, the balancing cylinder 131 is locked. When the pre-locking structures 133 separate from the balancing pins 132, the balancing cylinder 131 is unlocked, allowing relative movement between the balancing cylinder 131 and the grip 110. Of course, the number of active channels 131 a can be set to be greater, and the number of balancing pins 132 corresponds to the number of active channels 131 a , which can be designed and selected according to needs, and this embodiment does not impose any limitation on this.

[0048] refer to Figure 5 and Figure 6 Before welding, the end of the welding head 121 facing the workpiece is housed within the balancing cylinder 131. The workpiece can be a resin or other plastic part, or a metal part. Only when the multiple balancing pins 132 are in contact with the workpiece and subjected to a thrust in the first direction, can the "three-point plane" principle be used to determine that the front ends of the multiple balancing pins 132 are flush with the workpiece surface? At this point, the axis of the ultrasonic welding device 100 coincides with the normal to the workpiece surface. In other words, the ultrasonic welding device 100 is aligned with the workpiece surface. The operator applies a thrust to the grip 110, causing the balancing pins 132 to retract into the movable channel 131a in the first direction. The pre-locking structure 133 of the balancing unit 130 unlocks the balancing cylinder 131. Under the push of the workpiece, the balancing cylinder 131 moves in the first direction relative to the grip 110, exposing the welding head 121. In other words, if the balancing pin 132 is not in contact with the workpiece and is pushed in the first direction, the ultrasonic welding device 100 is not aligned with the workpiece surface. At this time, the pre-locking structure 133 locks the balancing cylinder 131, and subsequent welding operations cannot be performed.

[0049] The ultrasonic welding device 100 of the present invention only exposes the welding head 121 after ensuring that the ultrasonic welding device 100 is aligned with the workpiece surface. This means that when the operator performs the welding operation, the ultrasonic welding device 100 and the workpiece surface are always aligned, thus ensuring the quality of the welded product. During alignment, the operator simply places the ultrasonic welding device 100 on the workpiece surface and fine-tunes the tilt angle of the ultrasonic welding device 100 relative to the first direction until all the balancing pins 132 contact the workpiece surface. This simple and convenient alignment operation improves welding efficiency, eliminates the need for additional operator training, and contributes to cost savings, thus meeting the low-cost, short-cycle production requirements of the early product structural verification stage.

[0050] refer to Figure 1 In some embodiments, the balancing unit 130 may further include a mounting tube 134, which provides a mounting structural foundation for the balancing unit 130. One end of the mounting tube 134 is fixedly connected to the holding portion 110. For example, the mounting tube 134 may be welded and fixed to one end of the holding portion 110 facing the balancing tube 131, or the mounting tube 134 may be fixed to one end of the holding portion 110 facing the balancing tube 131 by bolts.

[0051] The inner side of the mounting tube 134 defines a mounting cavity 1341 extending along a first direction. The balancing tube 131 is movably disposed in the mounting cavity 1341 along the first direction. For example, the balancing tube 131 can slide and extend relative to the mounting tube 134 along the first direction. Alternatively, the balancing tube 131 can be threadedly engaged with the mounting tube 134, meaning that the balancing tube 131 can rotate relative to the mounting tube 134 while also moving relative to the mounting tube 134 in the first direction. This facilitates welding by allowing the welding head 121 to be exposed from the balancing tube 131.

[0052] refer to Figure 2 The balancing cylinder 131 is provided with a first locking hole. The first locking hole extends radially through the movable channel 131a and the outer peripheral wall of the balancing cylinder 131. In other words, the first locking hole communicates with both the movable channel 131a and the outer peripheral wall of the balancing cylinder 131. A pre-locking structure 133 is movably disposed within the first locking hole and releasably contacts the balancing pin 132. For example, the pre-locking structure 133 can slide radially within the first locking hole, separating from or contacting the balancing pin 132. Alternatively, the pre-locking structure 133 can rotate and retract radially within the first locking hole. When the pre-locking structure 133 extends into the movable channel 131a, it contacts the balancing pin 132. When the pre-locking structure 133 exits the movable channel 131a, it separates from the balancing pin 132. This facilitates locking and unlocking of the balancing cylinder 131 by the pre-locking structure 133, improving its reliability.

[0053] refer to Figure 2 and Figure 3 According to some embodiments of the present invention, a second locking hole is provided in the mounting cylinder 134. The second locking hole is radially opposite and connected to the first locking hole, allowing the pre-locking structure 133 to be better embedded and secured. Part of the pre-locking structure 133 (such as the second locking portion 1331b described below) is also located in the second locking hole. Thus, when the pre-locking structure 133 is located in both the first and second locking holes, the balancing cylinder 131 and the mounting cylinder 134 are relatively locked. When the pre-locking structure 133 is located only in the second locking hole, the balancing cylinder 131 and the mounting cylinder 134 are unlocked, further improving the reliability of locking and unlocking the balancing cylinder 131.

[0054] Continue to refer Figure 2 and Figure 3 According to some embodiments of the present invention, the pre-locking structure 133 may include a locking piece 1331 and a first elastic piece 1332. A locking groove 1321 is provided on the balancing needle 132. The locking piece 1331 can extend into or exit the locking groove 1321. When the locking piece 1331 extends into the locking groove 1321, the locking piece 1331 simultaneously passes through the first locking hole and the second locking hole, locking the balancing cylinder 131. When the locking piece 1331 exits the locking groove 1321, the balancing cylinder 131 is unlocked.

[0055] Optionally, the locking groove 1321 may be an annular groove circumferentially surrounding the balancing pin 132. This allows the locking member 1331 to lock or unlock the balancing pin 132 even if the circumferential angle of the balancing pin 132 changes. In the first direction, the two side walls of the locking groove 1321 may be angled to form a "V" shape. In other words, the opening of the locking groove 1321 gradually increases radially outward, and the locking member 1331 is inserted into the locking groove 1321 to lock and engage. When the locking member 1331 and the balancing pin 132 are unlocked, the balancing pin 132 slides relative to each other in the first direction, and the relatively inclined side walls of the locking groove 1321 push the locking member 1331 out of the locking groove 1321, thereby unlocking the balancing cylinder 131.

[0056] The first elastic member 1332 is positioned within the second locking hole. One end of the first elastic member 1332 is connected to the locking member 1331, and the other end is connected to the mounting cylinder 134. Thus, the first elastic member 1332 applies a pre-tightening force to the locking member 1331 along the radial direction of the balancing cylinder 131 toward the balancing pin 132. This improves the reliability of the pre-locking structure 133 before welding. After welding, the first elastic member 1332 applies a restoring force to the locking member 1331 to re-lock the balancing cylinder 131.

[0057] Optionally, the first elastic member 1332 may include but is not limited to a spring, an elastic rubber pad, a silicone pad or other materials to save costs.

[0058] refer to Figure 2 、 Figure 3 、 Figure 5 and Figure 6 Furthermore, the locking member 1331 may include a first locking portion 1331a and a second locking portion 1331b. The first locking portion 1331a is slidably disposed in the first locking hole, and the second locking portion 1331b is slidably disposed in the second locking hole. When the locking member 1331 locks the balancing cylinder 131, the front end of the first locking portion 1331a extends into the locking groove 1321, and the end of the second locking portion 1331b facing the first locking portion 1331a is located in the first locking hole. At this time, the second locking portion 1331b prevents relative movement between the balancing cylinder 131 and the mounting cylinder 134. When the locking member 1331 unlocks the balancing cylinder 131, the end of the second locking portion 1331b facing the first locking portion 1331a is located in the second locking hole, that is, the second locking portion 1331b is disconnected from the first locking hole. At this time, the balancing cylinder 131 and the mounting cylinder 134 can move relative to each other.

[0059] As can be understood, the length of the first locking portion 1331a is equal to the radial length of the first locking hole along the balancing cylinder 131. When the locking member 1331 locks the balancing cylinder 131, the second locking portion 1331b, under the elastic action of the first elastic member 1332, extends into the first locking hole, pushing the first locking portion 1331a into the locking groove 1321. When the balancing cylinder 131 is unlocked, the balancing pin 132 is pushed back into the movable channel 131a, the locking groove 1321 is offset from the first locking portion 1331a, and the first locking portion 1331a retreats into the first locking hole, pushing the second locking portion 1331b out of the first locking hole, allowing relative movement between the balancing cylinder 131 and the mounting cylinder 134.

[0060] refer to Figure 3 In some embodiments, a second elastic member 1311 is disposed within the movable channel 131a. The ends of the second elastic member 1311 are connected to the balancing pin 132 and the wall of the movable channel 131a, respectively. Consequently, after welding a product, the operator simply lifts the ultrasonic welding device 100. The elastic force of the second elastic member 1311 automatically resets the balancing pin 132, reducing the operator's workload. Furthermore, the elasticity of the second elastic member 1311 facilitates the proper alignment of the locking groove 1321 of the balancing pin 132 with the locking member 1331, thereby enhancing the structural reliability of the ultrasonic welding device 100.

[0061] Optionally, the second elastic member 1311 may include but is not limited to a spring, an elastic rubber pad or a silicone pad, etc., so as to save costs.

[0062] Continue to refer Figure 1 In some embodiments, the wall of the mounting cavity 1341 protrudes radially inward to form a first protrusion 1343, and the outer wall of the balancing cylinder 131 protrudes radially outward to form a second protrusion 1312. The first protrusion 1343 and the second protrusion 1312 are opposed to each other along a first direction. The ultrasonic welding device 100 may also include a third elastic member 140, with its ends connected to opposing surfaces of the first protrusion 1343 and the second protrusion 1312 along the first direction. In this way, after welding a product, the operator only needs to lift the ultrasonic welding device 100. The elastic force of the third elastic member 140 automatically resets the balancing cylinder 131, causing the pre-locking structure 133 to lock the balancing cylinder 131. This reduces the operator's workload and improves the structural reliability of the ultrasonic welding device 100.

[0063] It is understood that the first protrusion 1343 and the second protrusion 1312 can be two protrusions facing each other along the first direction, or the first protrusion 1343 and the second protrusion 1312 can be two protruding rings to ensure the connection strength between the first protrusion 1343 and the second protrusion 1312 and the third elastic member 140. In addition, to prevent the balancing cylinder 131 and the mounting cylinder 134 from being disconnected, the ends of the third elastic member 140 can be fixedly connected to the first protrusion 1343 and the second protrusion 1312, respectively.

[0064] Optionally, the third elastic member 140 may include but is not limited to a spring, an elastic rubber pad or a silicone pad, etc., in order to save costs.

[0065] refer to Figure 1 and Figure 7 In some embodiments, the balancing unit 130 may further include a limiter 135. The limiter 135 is disposed in the mounting cavity 1341 and is located on the side of the balancing cylinder 131 facing the gripping portion 110. When the welding head 121 welds to a set depth, the balancing cylinder 131 abuts against the limiter 135. At this time, the welding head 121 cannot continue to move relative to the balancing cylinder 131, and it can be determined that the welding operation is completed. The structure is simple, and the operator can accurately judge the welding depth under manual welding conditions, which is conducive to improving the consistency of the same batch of products.

[0066] refer to Figure 1 and Figure 3 According to some embodiments of the present invention, the limiting member 135 defines a second through hole 1351, and the welding head 121 is passed through the second through hole 1351. The aperture of the second through hole 1351 is smaller than the outer diameter of the welding head 121. In this way, the welding head 121 is prevented from falling off from the mounting tube 134, causing damage to the ultrasonic welding device 100, thereby improving the structural reliability of the ultrasonic welding device 100.

[0067] refer to Figure 1 and Figure 3 According to some embodiments of the present invention, the wall of the mounting cavity 1341 is provided with a first internal thread 1341a, and the outer wall of the stopper 135 is provided with a first external thread 1352. The stopper 135 is threadedly engaged with the mounting tube 134. By rotating the stopper 135 and the mounting tube 134 relative to each other, the relative position between the stopper 135 and the balancing tube 131 in the first direction changes, thereby changing the set depth. This makes the welding depth of the ultrasonic welding device 100 adjustable, facilitating the processing of workpieces requiring different welding depths in different batches, thereby expanding the application range of the ultrasonic welding device 100.

[0068] refer to Figure 1 and Figure 4 According to some embodiments of the present invention, the limiting member 135 includes a first limiting section 135a and a second limiting section 135b. The first limiting section 135a is provided with a first external thread 1352 that matches the first internal thread 1341a on the inner wall of the installation cavity 1341.

[0069] The second limiting section 135b is spaced from the inner wall of the mounting cavity 1341. Adjustment teeth 135c are circumferentially arranged on the outer wall of the second limiting section 135b. The mounting tube 134 is provided with an adjustment hole extending through the wall of the mounting cavity 1341. The adjustment hole is opposite the adjustment teeth 135c and extends circumferentially along the mounting tube 134. In other words, the adjustment hole has a predetermined circumferential width. The balancing unit 130 may also include an adjustment rod (not shown) having an insertion end that mates with the adjustment teeth 135c. To adjust the weld depth, the insertion end is inserted through the adjustment hole between two adjacent adjustment teeth 135c. The rod is then rotated along the adjustment hole, causing the limiting member 135 to rotate relative to the mounting tube 134, thereby changing the spacing between the limiting member 135 and the balancing tube 131. In this manner, the adjustment rod is inserted through the adjustment hole between the adjustment teeth 135c, causing the limiting member 135 to rotate, thereby adjusting the weld depth. This structure is simple and easy to operate.

[0070] Optionally, two adjustment holes can be provided, and the two adjustment holes are opposite to each other along the radial direction of the mounting tube 134. In this way, the position of the limit member 135 can be adjusted by inserting the adjustment rod from the two adjustment holes respectively. The limit member 135 is subjected to more uniform force and the adjustment operation is more convenient.

[0071] refer to Figure 1 and Figure 8In some embodiments, a receiving cavity 111 with an open end is provided on the inner side of the gripping portion 110, and the welding unit 120 further includes a transducer 122, which converts electrical energy into mechanical vibration energy, so that the workpiece is welded. The transducer 122 is fixedly mounted in the receiving cavity 111. During the welding process, the operator's grip can effectively reduce the vibration and displacement of the transducer 122, improve the stability of the welding process, and ensure the consistency and reliability of the welding quality. The welding head 121 is fixedly connected to the transducer 122, and the welding head 121 extends from the receiving cavity 111. In this way, the maintenance and replacement of the transducer 122 are more convenient.

[0072] Furthermore, the accommodating chamber 111 is provided with a fixing member 112, and the transducer 122 is fixedly installed in the accommodating chamber 111 through the fixing member 112. The outer wall of the fixing member 112 is provided with a second external thread 1121, and the inner wall of the accommodating chamber 111 is provided with a second internal thread 1111. The fixing member 112 is threadedly connected to the inner wall of the accommodating chamber 111, and the two ends of the transducer 122 are respectively in contact with the inner wall of the accommodating chamber 111 and the fixing member 112. The design of the threaded connection between the fixing member 112 and the inner wall of the accommodating chamber 111 makes the installation and removal of the transducer 122 more convenient. The transducer 122 can be easily installed in or removed from the accommodating chamber 111 by rotating the fixing member 112, simplifying the maintenance and replacement process. A third through hole is opened on the fixing member 112, and the welding head 121 passes through the third through hole, so that the vibration energy generated by the transducer 122 can be directly transmitted to the welding head 121, reducing energy loss and improving welding efficiency and quality.

[0073] In some embodiments, the ultrasonic welding device 100 further includes an airflow channel that passes through the grip 110 and the balancing unit 130. One end of the airflow channel is connected to a purge device, and the other end extends to the end of the balancing cylinder 131 away from the grip 110. For example, the airflow channel can be directly connected to the balancing cylinder 131, or an internal flow channel can be provided within the ultrasonic welding device 100, with the airflow channel communicating with the internal flow channel, and the outlet of the internal flow channel being located at the end of the balancing cylinder 131 away from the grip 110. In this way, after welding is completed, cooling gas can be blown to the welded portion of the workpiece through the purge device, allowing the weld to cool rapidly, thereby improving weld quality.

[0074] Continue to refer Figure 1 Optionally, the internal flow channel can flow through the transducer 122 and the welding head 121, so as to quickly cool the high-temperature transducer 122 and the welding head 121, thereby extending the service life of the ultrasonic welding device 100.

[0075] Furthermore, an air pipe connection port 150 is provided at the end of the grip 110 away from the balancing cylinder 131. This port 150 communicates with the air flow channel. The purge device's piping can be connected to this port. This location of the port 150 at the end of the grip 110 away from the balancing cylinder 131 allows for a more streamlined piping arrangement, minimizing any impact on the operator's welding operation.

[0076] The air pipe connection port 150 can be one end of the aforementioned air flow channel, connected to the accommodating cavity 111. The fixing member 112 can be provided with circumferential air holes, which extend through the fixing member 112 in a first direction. In this way, cooling gas flows through the transducer 122, then through the air holes to the retaining member 135, and then through the second through hole 1351 in the retaining member 135 to the balancing cylinder 131. It then flows out from the end of the balancing cylinder 131 away from the grip portion 110, cooling the welding head 121 and the welded joint of the workpiece.

[0077] The operating principle of the present invention is:

[0078] The workpieces to be welded are stacked and placed. The operator holds the gripping portion 110 and places the balancing cylinder 131 of the ultrasonic welding device 100 toward the workpiece surface. The operator fine-tunes the axial direction of the ultrasonic welding device 100 relative to the first direction so that all the balancing pins 132 contact the workpiece surface, thereby aligning the ultrasonic welding device 100 with the workpiece surface.

[0079] The operator applies a thrust to the ultrasonic welding device 100 toward the workpiece, causing the balancing pin 132 to retract into the movable channel 131a in the first direction. The locking groove 1321 and the locking member 1331 are displaced, and the second locking portion 1331b of the locking member 1331 exits the first locking hole. At this point, the balancing cylinder 131 is unlocked. Under the interaction force of the workpiece surface, the balancing cylinder 131 approaches the gripping portion 110 in the first direction, exposing the welding head 121. The welding head 121 contacts the workpiece surface, activating the transducer 122. This causes the welding head 121 to vibrate at a high frequency. The high-frequency friction with the workpiece generates heat, melting the material around the welding head 121 and causing it to penetrate the workpiece. The weld depth reaches the set depth, and the balancing cylinder 131 contacts the stopper 135, preventing further downward pressure. A purge device introduces cooling gas to cool the transducer 122, welding head 121, and the welded area. After a period of time, the ultrasonic welding device 100 is lifted and the next weld is performed.

[0080] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are 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 orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0081] In the description of the present invention, "first feature" or "second feature" may include one or more of the features.

[0082] In the description of the present invention, "plurality" means two or more.

[0083] In the description of the present invention, a first feature being “on” or “under” a second feature may include the first and second features being in direct contact with each other, or the first and second features not being in direct contact with each other but being in contact with each other via another feature therebetween.

[0084] In the description of the present invention, “on”, “above” and “above” a first feature of a second feature include the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0085] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative uses of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0086] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. An ultrasonic welding device (100), characterized in that: include: a grip portion (110); A welding unit (120) comprising a welding head (121), the welding head (121) being used to weld a workpiece, the welding head (121) being fixedly connected to the holding portion (110); A balancing unit (130) includes a balancing cylinder (131), a balancing needle (132), and a pre-locking structure (133), wherein the balancing cylinder (131) is sleeved on the radially outer side of the welding head (121) and is movable relative to the holding portion (110) along a first direction, and the balancing cylinder (131) is further provided with at least three movable channels (131a) extending along the first direction, and the at least three movable channels (131a) are arranged at intervals along the circumference of the balancing cylinder (131), and the balancing needle (132) corresponds to the movable channels (131a) and is movably provided in the corresponding movable channels (131a) along the first direction, and the pre-locking structure (133) is in detachable contact with the balancing needle (132) to lock or unlock the balancing cylinder (131). The balancing unit (130) is configured to unlock the pre-locking structure (133) and retract into the movable channel (131a) when the plurality of balancing needles (132) are in contact with the workpiece and are subjected to a thrust along the first direction, so that the balancing cylinder (131) moves along the first direction under the thrust of the workpiece, exposing the welding head (121).

2. The ultrasonic welding device (100) according to claim 1, characterized in that: The balancing unit (130) further includes: a mounting tube (134), one end of the mounting tube (134) being fixedly connected to the gripping portion (110), an inner side of the mounting tube (134) defining a mounting cavity (1341) extending along a first direction, and the balancing tube (131) being movably disposed in the mounting cavity (1341) along the first direction. The balancing cylinder (131) is provided with a first locking hole that penetrates the movable channel (131a) and the outer peripheral wall of the balancing cylinder (131) in a radial direction of the balancing cylinder (131); the pre-locking structure (133) is movably provided in the first locking hole and is in detachable contact with the balancing needle (132).

3. The ultrasonic welding device (100) according to claim 2, characterized in that: The mounting cylinder (134) is provided with a second locking hole that is radially opposite to and communicates with the first locking hole, and a portion of the pre-locking structure (133) is also located in the second locking hole.

4. The ultrasonic welding device (100) according to claim 3, characterized in that The pre-locking structure (133) includes a locking member (1331) and a first elastic member (1332). The balancing needle (132) is provided with a locking groove (1321). The locking member (1331) can extend into or withdraw from the locking groove (1321). The first elastic member (1332) is located in the second locking hole. One end of the first elastic member (1332) is connected to the locking member (1331), and the other end is connected to the mounting tube (134).

5. The ultrasonic welding device (100) according to claim 4, characterized in that: The locking member (1331) comprises a first locking portion (1331a) and a second locking portion (1331b), wherein the first locking portion (1331a) is slidably disposed in the first locking hole, and the second locking portion (1331b) is slidably disposed in the second locking hole. The second locking portion (1331b) is constructed such that when the locking member (1331) locks the balancing cylinder (131), one end of the second locking portion (1331b) facing the first locking portion (1331a) is located in the first locking hole; and when the locking member (1331) unlocks the balancing cylinder (131), one end of the second locking portion (1331b) facing the first locking portion (1331a) is located in the second locking hole.

6. The ultrasonic welding device (100) according to claim 1, characterized in that A second elastic member (1311) is provided in the movable channel (131a), and two ends of the second elastic member (1311) are respectively connected to the balancing needle (132) and the cavity wall of the movable channel (131a).

7. The ultrasonic welding device (100) according to claim 2, characterized in that The cavity wall of the installation cavity (1341) protrudes radially inward to form a first protrusion (1343), and the outer wall of the balancing cylinder (131) protrudes radially outward to form a second protrusion (1312), and the first protrusion (1343) and the second protrusion (1312) are opposite to each other along the first direction. The ultrasonic welding device (100) further comprises: a third elastic member (140), wherein two ends of the third elastic member (140) are respectively connected to two side surfaces of the first protrusion (1343) and the second protrusion (1312) that are opposite to each other along the first direction.

8. The ultrasonic welding device (100) according to claim 2, characterized in that The balancing unit (130) further includes a limiting member (135), the limiting member (135) being disposed in the mounting cavity (1341) and located on a side of the balancing cylinder (131) facing the gripping portion (110), the limiting member (135) being configured such that when the welding head (121) is welded to a set depth, the balancing cylinder (131) abuts against the limiting member (135).

9. The ultrasonic welding device (100) according to claim 8, characterized in that: The limiting member (135) defines a second through hole (1351), the welding head (121) is passed through the second through hole (1351), and the diameter of the second through hole (1351) is smaller than the outer diameter of the welding head (121).

10. The ultrasonic welding device (100) according to claim 8, characterized in that A first internal thread (1341a) is provided on the cavity wall of the installation cavity (1341), a first external thread (1352) is provided on the outer wall of the limiting member (135), and the limiting member (135) is threadably matched with the installation cylinder (134).

11. The ultrasonic welding device (100) according to claim 10, characterized in that The limiting member (135) includes a first limiting section (135a) and a second limiting section (135b), the first limiting section (135a) is provided with the first external thread (1352), the second limiting section (135b) is spaced apart from the inner wall of the installation cavity (1341), and the outer wall of the second limiting section (135b) is circumferentially arranged with adjustment teeth (135c), the installation tube (134) is provided with an adjustment hole that passes through the cavity wall of the installation cavity (1341), the adjustment hole is opposite to the adjustment tooth (135c), and the adjustment hole extends along the circumference of the installation tube (134). The balancing unit (130) further includes an adjusting rod having an insertion end matching the adjusting tooth (135c), the insertion end being inserted into the adjusting tooth (135c) via the adjusting hole and rotating along the adjusting hole to drive the limiting member (135) to rotate.

12. The ultrasonic welding device (100) according to claim 1, characterized in that An accommodating cavity (111) with an open end is provided on the inner side of the gripping portion (110). The welding unit (120) further comprises a transducer (122). The transducer (122) is fixedly mounted in the accommodating cavity (111). The welding head (121) is fixedly connected to the transducer (122), and the welding head (121) extends from the accommodating cavity (111).

13. The ultrasonic welding device (100) according to claim 12, characterized in that: The accommodating cavity (111) is provided with a fixing member (112), and the transducer (122) is fixedly mounted on the accommodating cavity (111) via the fixing member (112). The outer wall of the fixing member (112) is provided with a second outer thread (1121), and the inner wall of the accommodating cavity (111) is provided with a second inner thread (1111). The fixing member (112) is threadedly connected to the inner wall of the accommodating cavity (111). A third through hole is provided on the fixing member (112), and the welding head (121) passes through the third through hole.

14. The ultrasonic welding device (100) according to claim 1, characterized in that The ultrasonic welding device (100) is further provided with an air flow channel, the air flow channel passing through the gripping portion (110) and the balancing unit (130), one end of the air flow channel being connected to the purge device, and the other end extending to an end of the balancing cylinder (131) away from the gripping portion (110).

15. The ultrasonic welding device (100) according to claim 14, characterized in that An air pipe connection port (150) is provided at one end of the gripping portion (110) away from the balancing cylinder (131), and the air pipe connection port (150) is in communication with an air flow channel.

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