Ultrasonic welding device

Abstract

The invention discloses an ultrasonic welding device. The ultrasonic welding device comprises a holding part; the welding unit comprises a welding head, and the welding head is fixedly connected with the holding part; the balance unit comprises a balance cylinder, a balance needle and a pre-locking structure, the balance cylinder is arranged on the radial outer side of the welding head in a sleeving mode and can move relative to the holding part in the first direction, the balance cylinder is further provided with at least three movable channels extending in the first direction, the at least three movable channels are arranged in the circumferential direction of the balance cylinder at intervals, and the balance needle corresponds to the movable channels; the pre-locking structures are arranged on the corresponding movable channels in the first direction in a movable mode, the pre-locking structures make separable contact with the balance needles so as to lock or unlock the balance cylinders, and the pre-locking structures and the balance needles are unlocked when the multiple balance needles make contact with the workpiece and bear thrust in the first direction so that the balance cylinders can move in the first direction under abutting and pushing of the workpiece. And exposing the welding head. The ultrasonic welding device disclosed by the invention can meet the production requirements of low cost and short period in an earlier-stage structure verification stage of a product.

Description

Technical Field

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

[0002] For products with high welding strength and high surface quality requirements, traditional ultrasonic welding usually relies on robots or special welding equipment. The equipment has a complex structure, and the process debugging of the equipment requires high skills of the operator, resulting in high equipment investment costs and long debugging cycles. In the early stage of product verification, robots or special welding equipment cannot meet the needs of low cost and short cycle, and it is difficult to ensure the stability of supply for small batch production.

[0003] Although ordinary handheld ultrasonic welding equipment has reduced equipment costs and debugging difficulties to a certain extent, it often leads to a high product scrap rate because the welding direction is difficult for operators to accurately control during the welding process. This situation is particularly prominent in the early stage of product structure verification, because the special equipment has not yet been developed and the handheld equipment cannot meet the quality requirements, resulting in a longer project verification cycle, increased verification costs, and a lot of 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 purpose of the present invention is to provide an ultrasonic welding device, in which the pre-locking structure unlocks the balancing pin only when the workpiece surface of the balancing cylinder is aligned, so that the welding head can expose the balancing cylinder for welding, and the alignment operation is convenient, which is conducive to the operator to align the welding direction of the ultrasonic welding device with the workpiece surface, improve the welding quality and welding efficiency, and thus meet the low-cost and short-cycle production requirements in the early stage of product structure verification.

[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 is used to weld a workpiece, and the welding head is fixedly connected to the holding portion;

[0007] A balancing unit comprises a balancing cylinder, a balancing needle and a pre-locking structure, wherein the balancing cylinder is sleeved on the radial outer side of the welding head and is movable relative to the holding portion along a first direction, the balancing cylinder is further provided with at least three movable channels extending along 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 arranged in the corresponding movable channels along the first direction, the pre-locking structure is detachably in contact with 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 needles 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 to expose the welding head.

[0009] The ultrasonic welding device of the present invention has at least three active channels with balancing pins. When all the balancing pins are in contact with the workpiece and are subjected to a thrust in the first direction, it can be determined by the "three-point plane determination" principle that at this time, the front ends of the multiple balancing pins are flush with the surface of the workpiece, and the contraction direction of the balancing pins, that is, the first direction, is perpendicular to the surface of the workpiece. Only then will the balancing cylinder move away from the welding head in the first direction, and the welding head can perform welding. In this way, it is ensured that the welding head will only weld the workpiece in the first direction under the action of the thrust, so that the welding direction is consistent. The operator only needs to adjust the inclination angle of the ultrasonic welding device. When all the balancing pins are aligned with the workpiece surface and contract along the active channel, it can be determined that the welding direction has been aligned. The alignment operation is convenient, which is conducive to improving the welding efficiency, thereby meeting the low-cost and short-cycle production requirements in the early structural verification stage of the product.

[0010] In some embodiments, the balancing unit further includes: a mounting cylinder, one end of which is fixedly connected to the holding portion, the inner side of the mounting cylinder defines a mounting cavity extending along a first direction, the balancing cylinder is movably disposed in the mounting cavity along the first direction, the balancing cylinder is 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 is movably disposed in the first locking hole and is detachably contacted with the balancing needle.

[0011] According to some embodiments of the present invention, a second locking hole radially opposite to and connected to the first locking hole is provided on the mounting tube, and a 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 piece and a first elastic piece, the balance needle is provided with a locking groove, the locking piece can extend into or withdraw from the locking groove, the first elastic piece is in the second locking hole, one end of the first elastic piece is connected to the locking piece, 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 disposed in the first locking hole, the second locking portion is slidably disposed 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 disposed 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 installation cavity and located on the side of the balancing cylinder facing the holding 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 penetrating 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 holding 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 runs 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 an end of the balancing cylinder away from the gripping portion.

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

[0024] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through 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 easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0026] Figure 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 A 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 state diagram of a plurality of balancing pins of an ultrasonic welding device according to an embodiment of the present invention in contact and alignment with a workpiece surface;

[0031] Figure 6It is a state diagram of the ultrasonic welding device of the embodiment of the present invention where the pre-locking structure unlocks a plurality of balancing pins to allow the balancing cylinder to move relative to the holding portion to expose the welding head for welding;

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

[0033] Figure 8 It 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-holding 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-movable 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-installing cylinder; 1341-installing 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 - a third elastic member;

[0040] 150-Trachea connection port. DETAILED DESCRIPTION

[0041] Embodiments of the present invention are described in detail below, examples of which 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 only used to explain the present invention, and cannot be understood as limiting the present invention.

[0042] Reference below Figures 1 to 8, describing an ultrasonic welding device 100 of an embodiment of the present invention. The ultrasonic welding device 100 of 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 during rapid 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 holding portion 110 may be a columnar structure, so that the operator can hold it during welding. During the welding process, the operator applies thrust to the ultrasonic welding device 100 through the holding 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 holding portion 110, or may be installed on the holding 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 along a first direction relative to the holding portion 110. For example, the balancing cylinder 131 may slide and retract along the first direction relative to the holding portion 110, or the balancing cylinder 131 may be threadedly engaged with the holding portion 110, that is, the balancing cylinder 131 may have relative rotation with the holding portion 110, and may also have relative movement 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, and when the ultrasonic welding device 100 is needed 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 also 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. The balancing pin 132 corresponds to the movable channel 131a and is movably arranged in the corresponding movable channel 131a along the first direction. The pre-locking structure 133 is detachably in contact with the balancing pin 132 to lock or unlock the balancing cylinder 131. For example, three movable channels 131a can be provided, and can be arranged at intervals of 120° around the circumference of the balancing cylinder 131. Three balancing pins 132 are also correspondingly provided, and three pre-locking structures 133 are also correspondingly provided with the balancing pin 132. When the pre-locking structure 133 contacts the balancing pin 132, the balancing cylinder 131 is locked. When the pre-locking structure 133 is separated from the balancing pin 132, the balancing cylinder 131 is unlocked, so that the balancing cylinder 131 can move relative to the gripping portion 110. Of course, the number of active channels 131 a can be set to be greater, and the number of balance needles 132 corresponds to the number of active channels 131 a , which can be designed and selected according to needs, and this embodiment does not limit this.

[0048] refer to Figure 5 and Figure 6 Before welding, the end of the welding head 121 facing the workpiece is stored in the balancing cylinder 131. The workpiece here can be a resin part or other plastic part, or a metal part. Only when the multiple balancing pins 132 are in contact with the workpiece and are subjected to a thrust in the first direction, according to the principle of "three points to determine the plane", it can be determined that the front ends of the multiple balancing pins 132 are flush with the surface of the workpiece. At this time, the axis of the ultrasonic welding device 100 coincides with the normal line of the workpiece surface. In other words, at this time, the ultrasonic welding device 100 is aligned with the surface of the workpiece. The operator applies a thrust to the gripping part 110, and the balancing pin 132 retreats into the active channel 131a along 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 relative to the gripping part 110 along the first direction to expose 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, and 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 can expose the welding head 121 only after it is determined that the ultrasonic welding device 100 is aligned with the workpiece surface, that is, when the operator performs the welding operation, the ultrasonic welding device 100 and the workpiece surface must be in an aligned state, thus ensuring the quality of the welded product. When aligning, the operator only needs to place the ultrasonic welding device 100 on the workpiece surface, and fine-tune the inclination angle of the ultrasonic welding device 100 relative to the first direction, so that all the balance pins 132 are aligned when they are in contact with the workpiece surface. The alignment operation is simple and convenient, thereby improving the welding efficiency, and no additional training is required for the operator, which is conducive to cost saving, thereby meeting the low-cost and short-cycle production requirements in the early stage of product structure verification.

[0050] refer to Figure 1 In some embodiments, the balancing unit 130 may further include a mounting tube 134, which provides a mounting structure 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 installation cylinder 134 defines an installation cavity 1341 that penetrates along the first direction. The balancing cylinder 131 is movably disposed in the installation cavity 1341 along the first direction. For example, the balancing cylinder 131 can slide and retract relative to the installation cylinder 134 along the first direction, or the balancing cylinder 131 can also be threadedly matched with the installation cylinder 134, that is, the balancing cylinder 131 can rotate relative to the installation cylinder 134 and can also move relative to the first direction. In this way, the welding head 121 is exposed from the balancing cylinder 131 for welding.

[0052] refer to Figure 2 The balancing cylinder 131 is provided with a first locking hole, and the first locking hole penetrates the active channel 131a and the outer peripheral wall of the balancing cylinder 131 along the radial direction of the balancing cylinder 131, that is, the first locking hole is connected to the active channel 131a and the outer peripheral wall of the balancing cylinder 131. The pre-locking structure 133 is movably arranged in the first locking hole and is detachably contacted with the balancing pin 132. For example, the pre-locking structure 133 can be slidably arranged in the first locking hole along the radial direction of the balancing cylinder 131, and is separated from or in contact with the balancing pin 132, or the pre-locking structure 133 can also be rotated and retracted in the first locking hole along the radial direction of the balancing cylinder 131, and when the pre-locking structure 133 extends into the active channel 131a, it is in contact with the balancing pin 132, and when the pre-locking structure 133 withdraws from the active channel 131a, it is separated from the balancing pin 132. In this way, the pre-locking structure 133 can lock and unlock the balancing cylinder 131, and the reliability of the pre-locking structure 133 is improved.

[0053] refer to Figure 2 and Figure 3 According to some embodiments of the present invention, a second locking hole is provided on the mounting cylinder 134, and the second locking hole is radially opposite to and connected to the first locking hole, so that the pre-locking structure 133 can be better embedded and fixed. Part of the structure of the pre-locking structure 133 (such as the second locking portion 1331b described later) is also located in the second locking hole. In this way, when the pre-locking structure 133 is located in the first locking hole and the second locking hole at the same time, the balancing cylinder 131 and the mounting cylinder 134 are relatively locked. When the pre-locking structure 133 is only located in the second locking hole, the balancing cylinder 131 and the mounting cylinder 134 are unlocked, which further improves the reliability of locking and unlocking of 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 to lock 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 surrounding the balancing pin 132. In this way, even if the angle of the balancing pin 132 in the circumferential direction changes, the locking member 1331 may lock or unlock the balancing pin 132. In the first direction, the two side walls of the locking groove 1321 may have an angle to form a "V"-shaped structure. 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 for locking. When the locking member 1331 and the balancing pin 132 are unlocked, the balancing pin 132 slides relatively along 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, so that the balancing cylinder 131 is unlocked.

[0056] The first elastic member 1332 is 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 cylinder 134. In this way, 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 needle 132, before welding, so as to improve the reliability of the pre-locking structure 133. After welding, a restoring force is applied 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 or a silicone pad, etc., so as to save costs.

[0058] refer to Figure 2 , Figure 3 , Figure 5 and Figure 6 Further, 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 one 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 the relative movement between the balancing cylinder 131 and the mounting cylinder 134. 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, 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] It can be understood that 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 extends into the first locking hole under the elastic action of the first elastic member 1332, and pushes 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 by the thrust, the locking groove 1321 is staggered with the first locking portion 1331a, the first locking portion 1331a is withdrawn into the first locking hole, and the second locking portion 1331b is pushed out of the first locking hole, so that the balancing cylinder 131 and the mounting cylinder 134 can move relative to each other.

[0060] refer to Figure 3 In some embodiments, a second elastic member 1311 is provided in the active channel 131a, and the two ends of the second elastic member 1311 are respectively connected to the balancing pin 132 and the cavity wall of the active channel 131a. In this way, after a product is welded, the operator only needs to lift the ultrasonic welding device 100, and the balancing pin 132 can be automatically reset under the elastic force of the second elastic member 1311, thereby reducing the workload of the operator. In addition, the elastic effect of the second elastic member 1311 also facilitates the correct matching of the locking groove 1321 of the balancing pin 132 with the locking member 1331, thereby improving 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 and other materials to save costs.

[0062] Continue to refer Figure 1 In some embodiments, the cavity wall of the installation cavity 1341 protrudes radially inward to form a first protrusion 1343, and the outer wall of the balance 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 may also include a third elastic member 140, and the two ends of the third elastic member 140 are respectively connected to the two side surfaces of the first protrusion 1343 and the second protrusion 1312 that are opposite to each other along the first direction. In this way, after a product is welded, the operator only needs to lift the ultrasonic welding device 100, and under the elastic force of the third elastic member 140, the balance cylinder 131 can be automatically reset, so that the pre-locking structure 133 locks the balance cylinder 131, reducing the workload of the operator and improving the structural reliability of the ultrasonic welding device 100.

[0063] It can be understood that the first protrusion 1343 and the second protrusion 1312 can be two protrusions opposite to each other along the first direction, or the first protrusion 1343 and the second protrusion 1312 can also be two protrusion 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 balance cylinder 131 from being disconnected from the mounting cylinder 134, the two 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 materials such as a spring, an elastic rubber pad or a silicone pad, so as 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 installation cavity 1341 and is located on the side of the balancing cylinder 131 facing the gripping portion 110. When the welding head 121 is welded 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, 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 stopper 135, and the stopper 135 is threadedly matched with the installation cylinder 134. By making the stopper 135 and the installation cylinder 134 rotate relative to each other, at this time, in the first direction, the relative position between the stopper 135 and the balance cylinder 131 changes, so that the set depth changes. In this way, the welding depth of the ultrasonic welding device 100 is adjustable, which is convenient for processing workpieces of different batches that require different welding depths, 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 which matches the first internal thread 1341a on the inner wall of the installation cavity 1341.

[0069] 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, and the installation cylinder 134 is provided with an adjustment hole that penetrates the cavity wall of the installation cavity 1341, and the adjustment hole is opposite to the adjustment tooth 135c, and the adjustment hole extends along the circumference of the installation cylinder 134. In other words, the adjustment hole has a certain circumferential width. The balancing unit 130 may also include an adjustment rod (not shown in the figure), and the adjustment rod has an insertion end that matches the adjustment tooth 135c. When it is necessary to adjust the welding depth, the insertion end is inserted between two adjacent adjustment teeth 135c through the adjustment hole, and rotated along the adjustment hole, driving the limiting member 135 to rotate relative to the installation cylinder 134, and changing the spacing between the limiting member 135 and the balancing cylinder 131. In this way, the adjustment rod is inserted from the adjustment hole between the adjustment teeth 135c, and the fluctuation limiting member 135 rotates to adjust the welding depth, which has a simple structure and convenient operation.

[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 through 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 gripping effect can effectively reduce the vibration and displacement of the transducer 122, improve the stability during 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, so that 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 abutted against the inner wall of the accommodating chamber 111 and the fixing member 112. The design of the fixing member 112 being threadedly connected to the inner wall of the accommodating chamber 111 makes it more convenient to install and disassemble the transducer 122. The transducer 122 can be easily installed in or removed from the accommodating chamber 111 by rotating the fixing member 112, which simplifies the maintenance and replacement process. The fixing member 112 is provided with a third through hole, 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 is further provided with an airflow channel, which passes through the gripping portion 110 and the balancing unit 130, one end of the airflow channel is connected to the purge device, and the other end extends to the end of the balancing cylinder 131 away from the gripping portion 110. For example, the airflow channel can be directly connected to the balancing cylinder 131, or an internal flow channel can be provided inside the ultrasonic welding device 100, the airflow channel is connected to the internal flow channel, and the outlet of the internal flow channel is located at the end of the balancing cylinder 131 away from the gripping portion 110. In this way, after the welding is completed, the cooling gas can be blown to the welding part of the workpiece through the purge device, so that the welding part can be quickly cooled, thereby improving the welding quality.

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

[0075] Furthermore, 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 communicated with the air flow channel. The pipeline of the purge device can be connected to the air pipe connection port 150, and the air pipe connection port 150 is located at the end of the gripping portion 110 away from the balancing cylinder 131, so that the pipeline is arranged reasonably and the influence on the welding operation of the operator is reduced.

[0076] The air pipe connection port 150 may be one end of the above-mentioned air flow channel, connected to the accommodating cavity 111, and the fixing member 112 may be provided with air holes in the circumference, and the air holes penetrate the fixing member 112 along the first direction. In this way, after the cooling gas flows through the transducer 122, it flows to the stopper 135 through the air holes, flows to the balancing cylinder 131 through the second through hole 1351 on the stopper 135, and flows out from the end of the balancing cylinder 131 away from the gripping portion 110, so as to cool the welding head 121 and the welding part of the workpiece.

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

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

[0079] The operator applies a thrust toward the workpiece to the ultrasonic welding device 100, and the balance pin 132 retreats into the active channel 131a along the first direction, the locking groove 1321 is staggered with the locking member 1331, and the second locking portion 1331b of the locking member 1331 withdraws from the first locking hole. At this time, the balance cylinder 131 is unlocked. Under the interaction force of the workpiece surface, the balance cylinder 131 approaches the gripping portion 110 along the first direction to expose the welding head 121. The welding head 121 abuts against the workpiece surface to start the transducer 122, so that the welding head 121 vibrates at a high frequency, and generates heat by high-frequency friction with the workpiece, so that the material of the workpiece located around the welding head 121 is melted and penetrated into each other, until the welding depth reaches the set depth, and the balance cylinder 131 abuts against the stopper 135 and cannot be pressed down further. The purge device passes cooling gas to cool the transducer 122, the welding head 121 and the welding part, and after a period of time, the ultrasonic welding device 100 is lifted for the next welding.

[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 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, and do not indicate or imply that the referred device or element 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 that the first and second features are directly in contact with each other, or may include that the first and second features are not in direct contact with each other but are in contact with each other via another feature therebetween.

[0084] In the description of the present invention, “on”, “over” and “above” a first feature from a second feature includes 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] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0086] Although the 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 present invention, and that the scope of the present 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) comprises a balancing cylinder (131), a balancing needle (132) and a pre-locking structure (133); 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; the balancing cylinder (131) is further provided with at least three movable channels (131a) extending along the first direction; the at least three movable channels (131a) are arranged at intervals along the circumference of the balancing cylinder (131); the balancing needle (132) corresponds to the movable channels (131a) and is movably arranged in the corresponding movable channels (131a) along the first direction; the pre-locking structure (133) is detachably in 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, thereby exposing the welding head (121).

2. The ultrasonic welding device (100) according to claim 1, characterized in that: The balancing unit (130) further comprises: a mounting tube (134), one end of the mounting tube (134) being fixedly connected to the holding portion (110), the inner side of the mounting tube (134) defining a mounting cavity (1341) penetrating along a first direction, 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 which 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 arranged in the first locking hole and is detachably in contact with the balancing needle (132).

3. The ultrasonic welding device (100) according to claim 2, characterized in that: The installation cylinder (134) is provided with a second locking hole which is radially opposite to and connected to the first locking hole, and a part 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) comprises 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 withdraw from the locking groove (1321); the first elastic piece (1332) is located in the second locking hole; one end of the first elastic piece (1332) is connected to the locking piece (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; 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 comprises: a limiting member (135), the limiting member (135) being arranged in the installation cavity (1341) and located on a side of the balancing cylinder (131) facing the holding 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 tube (134).

11. The ultrasonic welding device (100) according to claim 10, characterized in that: The limiting member (135) comprises 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 mounting cavity (1341); adjusting teeth (135c) are circumferentially arranged on the outer wall of the second limiting section (135b); the mounting tube (134) is provided with an adjusting hole penetrating the cavity wall of the mounting cavity (1341); the adjusting hole is opposite to the adjusting teeth (135c); and the adjusting hole extends along the circumference of the mounting tube (134); The balancing unit (130) further comprises an adjusting rod, the 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 holding 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 out of 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), 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), the inner wall of the accommodating cavity (111) is provided with a second inner thread (1111), and the fixing member (112) is threadedly connected to the inner wall of the accommodating cavity (111), The fixing piece (112) is provided with a third through hole, 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 holding 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 holding 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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