Ultrasonic welding die for plastic articles

Abstract

The present disclosure relates to the field of ultrasonic welding, in particular to a plastic product ultrasonic welding die, the welding die comprises: a stepped horn made of TC4 titanium alloy, containing three sections of cylindrical bodies with diameters decreasing in turn; wherein the stepped horn is provided with external threads at the end; a quick-change joint is provided with internal threads matching the external threads of the horn at the front end, and a cross-shaped clamping groove is formed at the rear end; a welding head die is provided with a flat or curved working surface at the front end, and a cross-shaped boss is arranged at the rear end to cooperate with the clamping groove and is axially fixed by a locking nut; a damping ring is sleeved at the connection between the horn and the quick-change joint, and a spiral oil guide groove is arranged on the inner wall, and the present disclosure realizes the suppression of high-frequency vibration transmission and improves the heat dissipation effect through the above structure design.

Description

Technical Field

[0001] This disclosure relates generally to the field of ultrasonic welding technology, and more specifically to ultrasonic welding dies for plastic products. Background Technology

[0002] Ultrasonic welding technology, as a highly efficient, environmentally friendly, and precise joining method, has been widely used in modern industrial production, playing a crucial role, especially in many fields such as electronics, automobiles, medical, and packaging. Its principle involves an ultrasonic generator converting power frequency electrical energy into high-frequency electrical energy, which is then converted into high-frequency mechanical vibration by a transducer. This vibration is amplified by an amplitude transformer and transmitted to the welding head mold, causing high-frequency friction between the workpieces, thereby achieving welding.

[0003] However, existing ultrasonic welding equipment still has some problems that need to be solved in practical applications;

[0004] In terms of amplitude transformer design, traditional amplitude transformer structures are relatively simple and difficult to effectively match the diverse amplitude requirements of different welding conditions. When welding workpieces of different materials, thicknesses, and shapes, different amplitudes are required to ensure welding quality. If the amplitude transformer cannot accurately match the amplitude, it can easily lead to energy reflection, causing energy loss, reducing welding efficiency and quality, and increasing production costs. Moreover, some amplitude transformer designs occupy a large axial space, making them less adaptable to installation scenarios with limited space and restricting the scope of equipment use.

[0005] Regarding the connection and fixation of welding head molds, existing connection methods often suffer from difficulties in alignment and long installation times. Traditional connection structures require considerable time for precise alignment when changing molds, impacting production efficiency. Furthermore, insufficient connection rigidity is a significant issue; in high-frequency vibration environments, the connection is prone to loosening, leading to decreased welding accuracy and even affecting the normal operation of the equipment.

[0006] In terms of heat dissipation and vibration transmission control, a large amount of heat is generated during ultrasonic welding. If heat cannot be dissipated in a timely and effective manner, the equipment temperature will be too high, affecting the performance and life of the components. At the same time, high-frequency vibration will have adverse effects on other components during transmission. For example, quick-connect couplings and other parts are easily damaged by vibration, reducing the reliability and stability of the equipment.

[0007] In summary, existing ultrasonic welding equipment has many shortcomings in terms of amplitude transformer structure, welding head and mold connection method, heat dissipation, and vibration control. Therefore, there is an urgent need for a new ultrasonic welding technology solution to solve the above problems, improve the performance and applicability of ultrasonic welding equipment, and meet the needs of modern industrial production. Utility Model Content

[0008] To address issues related to amplitude, heat dissipation, space constraints, and mold connection and fixation under different welding conditions, this disclosure provides an ultrasonic welding mold head for plastic products, which suppresses high-frequency vibration transmission and improves heat dissipation.

[0009] According to one aspect of this disclosure, an ultrasonic welding mold head for plastic products is provided, comprising: a stepped amplitude transformer made of TC4 titanium alloy, comprising three cylindrical sections with successively decreasing diameters; wherein

[0010] The stepped amplitude transformer has external threads at its end;

[0011] The quick-change connector has an internal thread at the front end that matches the external thread of the luffing rod, and a cross-shaped groove at the rear end.

[0012] The welding head mold has a flat or curved working surface at the front end and a cross boss at the rear end that mates with the slot, and is axially fixed by a lock nut.

[0013] The damping ring is fitted at the connection between the luffing rod and the quick-change joint, and its inner wall is provided with a spiral oil guide groove.

[0014] In some embodiments, the stepped amplitude bar has multiple cooling oil channels along its axis inside, and the cooling oil channels are evenly distributed circumferentially at equal intervals.

[0015] The quick-connect connector has a heat dissipation fin group on its outer wall, with adjacent fins spaced apart.

[0016] The locking nut has an embedded graphite copper sleeve, and its outer surface is knurled to form an anti-slip texture.

[0017] In some embodiments, an annular damping groove is provided at the end of the maximum diameter section of the stepped amplitude bar, a silicone damping ring is embedded in the groove, and the outer surface of the damping ring protrudes to form a flexible contact interface.

[0018] A copper heat-conducting pad is provided between the end face of the quick-change connector and the luffing rod, and an oil guide hole communicating with the cooling oil passage is opened in the center of the pad.

[0019] The root of the cross-shaped boss of the welding head mold is machined with an inverted conical stress diffusion structure, and the conical surface and the side of the boss are smoothly transitioned.

[0020] The spiral oil guide groove of the damping ring extends to the base of the heat dissipation fin assembly of the quick-change connector, and the end cross-section of the oil guide groove has a gradually expanding structure.

[0021] In some embodiments, the welding head mold is provided with axial heat dissipation channels inside, and the end of the channels is kept at a safe distance from the working surface;

[0022] Spiral air guide grooves are machined between the heat dissipation fins of the quick-connect connector, and the direction of the grooves and the anti-slip texture of the locking nut form an airflow guiding structure.

[0023] The middle cylindrical section of the stepped amplitude rod is processed with a cross-shaped rolling texture.

[0024] The cooling oil passage ends in an expanded outlet, and the edge of the outlet forms a flow guide gap with the inner wall of the quick-change connector.

[0025] In some embodiments, the protruding side of the cross boss is provided with an elastic positioning component, the component having a built-in steel ball and a pre-compression stroke;

[0026] A hemispherical positioning recess is formed at the corresponding position on the inner wall of the slot;

[0027] The locking nut has a relief groove at the root of the thread, and an elastic sealing ring is embedded in the groove.

[0028] An annular oil reservoir is provided on the rear end face of the welding head mold, and the oil reservoir is connected to the axial heat dissipation channel through radial oil guide holes.

[0029] In some embodiments, a stepped sealing cavity is provided at the root of the internal thread of the quick-connect coupling, and a combined sealing ring is assembled in the cavity.

[0030] The external thread end of the amplitude transformer is machined with an introductory chamfer.

[0031] The inner hole of the locking nut is provided with a V-shaped oil guide ring groove;

[0032] The damping ring end face is machined with a waveform sealing groove.

[0033] In some embodiments, the end face of the locking nut is provided with a multi-layer disc-shaped elastic component;

[0034] The quick-connect coupling is provided with an annular limiting groove on the external thread section, and an open elastic retaining ring is installed in the groove.

[0035] The top of the cross-shaped boss is machined with a micro-tapered mating surface;

[0036] The surface of the amplitude transformer is marked with a laser marking area.

[0037] In some embodiments, the quick-connect coupling has axial positioning grooves on its outer wall;

[0038] A fluorescent positioning mark is embedded at the root of the cross-shaped boss;

[0039] The outer edge of the locking nut is provided with equally spaced positioning notches;

[0040] The end of the amplitude transformer is machined with a tapered guide section.

[0041] The embodiments disclosed herein have the following advantages.

[0042] The stepped amplitude transformer achieves progressive amplification of ultrasonic vibration through three cylindrical sections with decreasing diameters. Its external thread at the end engages with the internal thread of the quick-change connector to form a rigid connection.

[0043] The welding head mold is inserted into the cross-shaped slot of the quick-change connector through the cross boss, and the axial clamping force of the lock nut ensures that the mold is fixed.

[0044] The damping ring is fitted at the connection point, and its spiral oil guide groove guides the cooling oil to flow along the gap between the amplitude rod and the quick-change joint. At the same time, it suppresses the transmission of high-frequency vibration through friction damping.

[0045] The stepped amplitude transformer has a three-section diameter decreasing structure to achieve stepped amplification of ultrasonic vibration energy through abrupt changes in cross-section. Its external thread at the end forms a rigid connection with the internal thread of the quick-change connector, avoiding scattering loss of vibration energy during transmission.

[0046] The cross-shaped boss of the welding head mold is engaged with the cross-shaped slot of the quick-change connector, and the axial clamping of the locking nut enables the mold to be quickly positioned and fixed, significantly shortening the mold change time.

[0047] The spiral oil guide groove of the damping ring guides the cooling oil through the connection interface between the amplitude transformer and the quick-change joint, absorbing high-frequency vibration energy through oil viscosity damping, while carrying away the heat generated by friction.

[0048] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained by means of the structures particularly pointed out in the written description and the accompanying drawings.

[0049] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0050] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0051] Figure 1 A schematic diagram of an ultrasonic welding die head structure according to an embodiment of the present disclosure is shown.

[0052] Figure 2 A schematic diagram of an amplitude transformer structure according to an embodiment of the present disclosure is shown.

[0053] Figure 3 A schematic diagram of a quick-connect coupling structure according to an embodiment of the present disclosure is shown.

[0054] Figure 4 A schematic diagram of a fin structure according to an embodiment of the present disclosure is shown.

[0055] Figure 5 A schematic diagram of a boss structure according to an embodiment of the present disclosure is shown.

[0056] Figure 6 A schematic diagram of a damping ring structure according to an embodiment of the present disclosure is shown.

[0057] Figure 7 A schematic diagram of a locking nut structure according to an embodiment of the present disclosure is shown.

[0058] Figure 8 A cross-sectional view of a welding head mold according to an embodiment of the present disclosure is shown.

[0059] Figure Labels

[0060] 1-Amplitude rod; 2-External thread; 3-Quick-change connector; 4-Internal thread; 5-Slot; 6-Welding head mold; 7-Boss; 8-Damping ring; 9-Locking nut; 10-Helical oil guide groove; 11-Cooling oil passage; 12-Fin; 13-Shock absorber ring; 14-Shim; 15-Heat dissipation channel; 16-Helical air guide groove; 17-Cross-shaped rolling texture; 18-Steel ball; 19-Hemispherical positioning recess; 20-Elastic sealing ring; 21-Annular oil reservoir; 22-Oil guide hole; 23-Axial heat dissipation channel; 24-Disc-shaped elastic component. Detailed Implementation

[0061] To make the objectives, solutions, and advantages of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Unless otherwise stated, the terms used herein have their ordinary meanings in the art. The same reference numerals in the drawings represent the same parts.

[0062] In the description of this disclosure, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances.

[0063] As described above, in traditional ultrasonic welding of plastics, quick-connect fittings and other parts are easily damaged by vibration, which reduces the reliability and stability of the equipment.

[0064] To at least partially address one or more of the aforementioned problems and other potential issues, exemplary embodiments of this disclosure provide an ultrasonic welding die for plastic articles, the welding die comprising:

[0065] The stepped amplitude transformer 1, made of TC4 titanium alloy, consists of three cylindrical sections with progressively decreasing diameters; among them...

[0066] The stepped amplitude rod 1 has an external thread 2 at its end;

[0067] The quick-change connector 3 has an internal thread 4 at the front end that matches the external thread 2 of the amplitude rod 1, and a cross-shaped groove 5 at the rear end;

[0068] The welding head mold 6 has a flat or curved front working surface and a cross boss 7 at the rear end that mates with the slot 5. It is axially fixed by a locking nut 9.

[0069] The damping ring 8 is fitted at the connection between the luffing rod 1 and the quick-change joint 3, and its inner wall is provided with a spiral oil guide groove 10.

[0070] In the above embodiment, the stepped amplitude transformer 1 achieves the step-by-step amplification of ultrasonic vibration through a three-section cylindrical structure with decreasing diameter, and its end external thread 2 and quick-change connector 3 internal thread 4 form a rigid connection.

[0071] The welding head mold 6 is inserted into the cross-shaped slot 5 of the quick-change connector through the cross boss 7, and the axial clamping force of the locking nut 9 ensures that the mold is fixed.

[0072] The damping ring 8 is set at the connection, and its spiral oil guide groove 10 guides the cooling oil to flow along the gap between the amplitude rod and the quick-change joint, while suppressing the transmission of high-frequency vibration through friction damping.

[0073] The three-section diameter decreasing structure of the stepped amplitude transformer 1 achieves stepped amplification of ultrasonic vibration energy through abrupt changes in cross-section. Its end external thread 2 forms a rigid connection with the internal thread 4 of the quick-change connector 3, avoiding scattering loss of vibration energy during transmission.

[0074] The cross boss 7 of the welding head mold 6 is inserted into the cross-shaped slot 5 of the quick-change connector 3, and the axial clamping of the locking nut 9 is used to realize the quick positioning and fixation of the mold, which significantly shortens the mold change time.

[0075] The spiral oil guide groove 10 of the damping ring 8 guides the cooling oil through the connection interface between the amplitude rod 1 and the quick-change joint 3, and absorbs the high-frequency vibration energy through the oil viscosity damping, while carrying away the heat generated by friction.

[0076] Please see Figures 1-8 In some embodiments, the stepped amplitude bar 1 has multiple cooling oil channels 11 arranged along the axis inside, and the cooling oil channels 11 are evenly distributed circumferentially at equal intervals.

[0077] The quick-connector 3 has 12 sets of heat dissipation fins on its outer wall, with adjacent fins 12 spaced apart.

[0078] The locking nut 9 has an embedded graphite copper sleeve, and its outer surface is knurled to form an anti-slip texture.

[0079] In the above embodiment, the cooling oil channels 11 are evenly distributed along the axis of the luffing rod 1, introducing external cooling oil into the interior of the luffing rod, and carrying away the heat generated by high-frequency vibration through oil convection. The heat dissipation fins 12 on the outer wall of the quick-connect joint 3 enhance air convection heat dissipation by increasing the surface area, and the channels formed by the spacing between adjacent fins guide the airflow in a directional manner;

[0080] The locking nut 9 has an embedded graphite copper sleeve, which uses the self-lubricating properties of graphite to reduce thread friction, and the knurled anti-slip texture on the outer surface enhances the operability when manually tightening it.

[0081] The cooling oil channel 11 inside the luffing rod 1 directly delivers cooling oil to the area where vibration energy is concentrated. Together with the heat dissipation fins 12 on the outer wall of the quick-connect joint 3, it forms a dual heat dissipation system of "internal oil cooling + external air cooling", which effectively suppresses temperature rise.

[0082] The graphite copper sleeve embedded in the locking nut 9 reduces the friction coefficient of the threaded pair through the self-lubricating properties of graphite, preventing the amplitude rod 1 and the quick-change joint 3 from sticking and failing at high temperatures.

[0083] The knurled anti-slip texture on the outer surface of the locking nut 9 increases the friction when manually tightening, ensuring that a stable preload can be maintained even under high-frequency vibration.

[0084] Please see Figures 1-8 In some embodiments, an annular damping groove is provided at the end of the maximum diameter section of the stepped amplitude rod 1, and a silicone damping ring 13 is embedded in the groove. The outer surface of the damping ring 13 protrudes to form a flexible contact interface.

[0085] A copper heat-conducting pad 14 is provided between the end face of the quick-change connector 3 and the amplitude rod 1, and an oil guide hole 22 communicating with the cooling oil passage 11 is opened in the center of the pad 14.

[0086] The root of the cross boss 7 of the welding head mold 6 is machined with an inverted conical stress diffusion structure, and the conical surface and the side of the boss 7 are smoothly transitioned.

[0087] The spiral oil guide groove 10 of the damping ring 8 extends to the base of the heat dissipation fins 12 group of the quick-change connector 3, and the end cross section of the oil guide groove has a gradually expanding structure.

[0088] In the above embodiment, the silicone damping ring 13 in the annular damping groove absorbs the lateral vibration of the maximum diameter section of the amplitude rod 1 through elastic deformation, and its protruding surface forms a flexible contact interface with the copper heat-conducting pad 14 to suppress the transmission of vibration energy to the quick-connect joint 3.

[0089] The oil guide hole 22 of the copper gasket guides the cooling oil from the luffing rod oil passage 11 into the quick-change joint;

[0090] The inverted conical structure at the root of the cross boss 7 disperses stress concentration through geometric transition, and the end of the gradually expanding oil guide groove of the damping ring 8 expands the heat dissipation coverage area by utilizing the fluid diffusion effect.

[0091] The silicone damping ring 13 is embedded in the annular damping groove of the largest diameter section of the amplitude rod 1, and absorbs the lateral vibration energy through elastic deformation, blocking the path of vibration transmission to the quick-connect joint 3;

[0092] The oil guide hole 22 of the copper thermal pad 14 introduces the cooling oil from the cooling oil passage 11 of the amplitude rod 1 into the quick-change joint 3, and uses the high thermal conductivity of copper to accelerate the heat dissipation of the threaded connection part.

[0093] The inverted conical stress diffusion structure at the root of the 6-cross boss 7 of the welding head mold disperses stress concentration through geometric transition, preventing cracks from forming at the root due to cyclic load.

[0094] The end of the gradually expanding oil guide groove 10 of the damping ring 8 extends to the base of the heat dissipation fin 12, and the cooling oil is evenly covered in the root area of ​​the heat dissipation fin 12 by utilizing the cross-sectional expansion effect.

[0095] Please see Figures 1-8 In some embodiments, the welding head mold 6 is provided with axial heat dissipation channels 23 inside, and the end of the channel is kept at a safe distance from the working surface;

[0096] Spiral air guide grooves 16 are machined between the heat dissipation fins 12 groups of the quick-connect connector 3, and the direction of the grooves and the anti-slip texture of the locking nut 9 form an airflow guiding structure.

[0097] The middle cylindrical surface of the stepped amplitude rod 1 is processed with a cross-shaped rolling texture 17;

[0098] The cooling oil passage 11 forms an expansion outlet at its end, and the edge of the outlet forms a flow guide gap with the inner wall of the quick-change connector 3.

[0099] In the above embodiments, the axial heat dissipation channels 15 of the welding head mold 6 directly cool the high-temperature area near the working surface through internal airflow circulation. The spiral air guide groove 16 of the quick-change connector 3 matches the spiral direction of the anti-slip texture of the locking nut 9, and uses equipment vibration to disturb the air to form a directional airflow, accelerating the heat dissipation between the fins 12;

[0100] The cross-shaped rolling texture 17 in the middle section of the amplitude rod 1 increases the heat dissipation area through surface microstructure, while suppressing the propagation of microcracks caused by vibration. The expansion outlet at the end of the cooling oil passage 11 extends the heat exchange time by reducing the oil flow rate, and the guide gap guides the oil film to uniformly cover the threaded connection surface;

[0101] The axial heat dissipation channel 15 of the welding head mold 6 directly provides forced convection heat dissipation to the high-temperature area near the working surface, preventing molten plastic from adhering.

[0102] The spiral air guide groove 16 between the heat dissipation fins 12 of the quick-change connector 3 and the anti-slip texture of the locking nut 9 form a coordinated airflow channel, which uses the vibration of the equipment to disturb the air and generate directional airflow to improve the natural heat dissipation efficiency.

[0103] The cross-shaped rolling texture 17 in the middle section of the amplitude rod 1 increases the heat dissipation area through surface microstructure, while suppressing the propagation of microcracks caused by high-frequency vibration.

[0104] The expansion outlet at the end of the cooling oil passage 11 extends the heat exchange time by reducing the oil flow rate, and the guide gap ensures that the oil film evenly covers the threaded connection surface.

[0105] Please see Figures 1-8 In some embodiments, the protruding side of the cross boss 7 is provided with an elastic positioning component, the component having a built-in steel ball 18 and a pre-compression stroke;

[0106] A hemispherical positioning recess 19 is provided at the corresponding position on the inner wall of the slot 5;

[0107] The locking nut 9 has a relief groove at the root of its thread, and an elastic sealing ring 20 is embedded in the groove.

[0108] The rear end face of the welding head mold 6 is provided with an annular oil storage groove 21, which is connected to the axial heat dissipation channel 15 through a radial oil guide hole 22.

[0109] In the above embodiment, the steel ball 18 in the elastic positioning component generates tactile feedback with the hemispherical positioning recess 19 when the cross boss 7 is inserted into the slot 5, and the pre-pressure stroke eliminates the assembly gap.

[0110] The elastic sealing ring 20 in the relief groove compensates for thread machining tolerances and blocks the oil leakage path;

[0111] The annular oil reservoir 21 continuously replenishes lubricating grease to the heat dissipation channel 15 through the radial oil guide hole 22 via capillary action, and the depth of the oil reservoir ensures that the grease storage capacity meets the long-term operation requirements.

[0112] The elastic positioning component on the side of the cross boss 7 cooperates with the hemispherical positioning recess 19 on the inner wall of the slot 5 through the steel ball 18, so as to achieve precise positioning in blind operation.

[0113] The locking nut 9 has an elastic sealing ring 20 embedded in the relief groove at the root of the thread to compensate for machining tolerances and block the path of oil leakage along the thread gap;

[0114] The annular oil reservoir 21 on the rear end face of the welding head mold 6 continuously replenishes lubricating grease to the axial heat dissipation channel 15 through the radial oil guide hole 22, reducing the need for manual maintenance.

[0115] Please see Figures 1-8 In some embodiments, the quick-connect coupling 3 has a stepped sealing cavity at the root of the internal thread 4, and a combined sealing ring is assembled in the cavity.

[0116] The end of the external thread 2 of the amplitude transformer 1 is machined with an inlet chamfer;

[0117] The inner hole of the locking nut 9 is provided with a V-shaped oil guide ring groove;

[0118] The damping ring 8 has a waveform sealing groove machined on its end face.

[0119] In the above embodiments, the combined sealing ring in the stepped sealing cavity achieves dynamic and static sealing through the elastic deformation of multi-level materials such as fluororubber and polytetrafluoroethylene.

[0120] The chamfer at the end of the external thread 2 of the amplitude rod 1 guides the assembly alignment and avoids misalignment and damage to the sealing ring;

[0121] The V-shaped oil guide ring groove controls the oil film thickness through a gradually changing cross-section design, and the labyrinth structure of the wave-shaped sealing groove increases the resistance to oil leakage.

[0122] The quick-change connector has a stepped sealing cavity at the root of the internal thread 4 equipped with a combined sealing ring, which achieves dynamic and static mixed sealing through a multi-material layering design.

[0123] The chamfered guide ring at the end of the external thread 2 of the amplitude rod 1 is aligned and assembled to avoid scratching the sealing surface;

[0124] The V-shaped oil guide ring groove in the inner hole of the locking nut 9 controls the oil film thickness through a gradual change in cross section, balancing heat dissipation requirements and friction loss.

[0125] The wave-shaped sealing groove on the 8th end face of the damping ring and the 3rd end face of the quick-connect coupling form a labyrinth seal, which significantly increases the resistance to oil leakage.

[0126] Please see Figures 1-8 In some embodiments, the end face of the locking nut 9 is provided with a multi-layer disc-shaped elastic component 24;

[0127] The quick-connector 3 has an annular limiting groove in the two external thread sections, and an open elastic retaining ring is installed in the groove.

[0128] The top of the cross-shaped boss 7 is machined with a micro-tapered mating surface;

[0129] A laser marking area is provided on the surface of the amplitude transformer 1.

[0130] In the above embodiments, the multi-layer disc-shaped elastic component 24 provides continuous clamping force on the end face of the locking nut 9 to compensate for the preload attenuation caused by vibration; the open elastic retaining ring in the annular limiting groove restricts the axial displacement of the quick-change connector 3; the micro-tapered mating surface forms an interference fit between the cross boss 7 and the slot 5; and the laser marking area assists in assembly alignment through high-precision marking.

[0131] The multi-layered disc-shaped elastic component 24 on the end face of the locking nut 9 provides a continuous clamping force to counteract the preload decay caused by vibration;

[0132] An open-type elastic retaining ring is installed in the annular limiting groove of the external thread section of the quick-change connector 3 to restrict the axial movement of the quick-change connector 3.

[0133] The slightly tapered mating surface at the top of the cross boss 7 and the tapered surface at the bottom of the slot 5 form an interference fit, eliminating the mating clearance;

[0134] The laser marking area on the surface of the amplitude rod 1 provides a high-precision assembly reference, reducing the rate of operational errors.

[0135] Please see Figures 1-8 In some embodiments, the quick-connect connector 3 has axial positioning grooves on its outer wall;

[0136] Fluorescent positioning marks are embedded at the base of the 7th cross-shaped boss;

[0137] The outer edge of the locking nut 9 is provided with equally spaced positioning notches;

[0138] The end of the amplitude rod 1 is machined with a tapered guide section.

[0139] In the above embodiments, the axial positioning lines on the outer wall of the quick-change connector 3 and the fluorescent positioning marks at the root of the cross boss 7 form a visual alignment system to assist in rapid calibration in low-light environments; the equally spaced positioning notches of the locking nut 9 provide standard torque application points, and the tapered guide guides the amplitude transformer 1 and the quick-change connector 3 to be precisely aligned and assembled through the tapered surface.

[0140] The axial positioning lines on the outer wall of the quick-connect connector 3 and the fluorescent positioning marks at the root of the cross boss 7 form a visual alignment system, supporting rapid assembly in various environments.

[0141] The equally spaced positioning notches on the outer edge of the locking nut 9 provide uniform torque application points, avoiding stress concentration caused by eccentric locking;

[0142] The tapered guide at the end of the amplitude rod 1 guides the initial assembly alignment through the tapered surface, protecting the thread 2 and the sealing structure from damage.

[0143] The various embodiments of this disclosure have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

[0144] The terminology used herein is chosen to best explain the principles, practical applications, or technological improvements to the various embodiments, or to enable those skilled in the art to understand the embodiments disclosed herein.

[0145] The above are merely optional embodiments of this disclosure and are not intended to limit this disclosure. Various modifications and variations can be made to this disclosure by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. An ultrasonic welding die for plastic products, characterized in that, include: The stepped amplitude transformer (1), made of TC4 titanium alloy, consists of three cylindrical sections with progressively decreasing diameters; among which... The stepped amplitude bar (1) has an external thread (2) at its end; The quick-change connector (3) has an internal thread (4) at the front end that matches the external thread (2) of the stepped amplitude rod (1), and a cross-shaped groove (5) at the rear end; The welding head mold (6) has a flat or curved working surface at the front end and a cross boss (7) at the rear end that mates with the slot (5), and is axially fixed by a locking nut (9). The damping ring (8) is fitted at the connection between the stepped amplitude rod (1) and the quick-change joint (3), and the inner wall is provided with a spiral oil guide groove (10).

2. The ultrasonic welding die for plastic products according to claim 1, characterized in that, The stepped amplitude bar (1) has multiple cooling oil channels (11) arranged along the axis inside, and the cooling oil channels (11) are evenly distributed circumferentially at equal intervals; The quick-connect connector (3) has a set of heat dissipation fins (12) on its outer wall, with adjacent fins (12) spaced apart; The locking nut (9) has an embedded graphite copper sleeve, and the outer surface is knurled to form anti-slip patterns.

3. The ultrasonic welding die for plastic products according to claim 2, characterized in that, The stepped amplitude rod (1) has an annular damping groove at the end of the maximum diameter section. A silicone damping ring (13) is embedded in the groove, and the outer surface of the damping ring (13) protrudes to form a flexible contact interface. A copper heat-conducting pad (14) is provided between the end face of the quick-change connector (3) and the stepped amplitude rod (1), and an oil guide hole (22) communicating with the cooling oil passage (11) is opened in the center of the pad (14); The root of the cross boss (7) of the welding head mold (6) is machined with an inverted conical stress diffusion structure, and the conical surface and the side of the boss (7) are smoothly transitioned. The spiral oil guide groove (10) of the damping ring (8) extends to the base of the heat dissipation fins (12) of the quick-change connector (3), and the end section of the oil guide groove has a gradually expanding structure.

4. The ultrasonic welding die for plastic products according to claim 3, characterized in that, The welding head mold (6) is provided with axial heat dissipation channels (15) inside, and the end of the channel is kept at a safe distance from the working surface; Spiral air guide grooves (16) are machined between the heat dissipation fins (12) of the quick-connect connector (3), and the direction of the grooves and the anti-slip texture of the locking nut (9) form an airflow guiding structure; The middle cylindrical surface of the stepped amplitude rod (1) is processed with a cross-shaped rolling texture (17); The cooling oil passage (11) has an expansion outlet at its end, and the edge of the outlet forms a flow guide gap with the inner wall of the quick-change connector (3).

5. The ultrasonic welding die for plastic products according to claim 4, characterized in that, The protruding side of the cross boss (7) is provided with an elastic positioning component, which has a built-in steel ball (18) and a pre-compression stroke. A hemispherical positioning recess (19) is opened at the corresponding position on the inner wall of the slot (5); The locking nut (9) has a relief groove at the root of its thread, and an elastic sealing ring (20) is embedded in the groove; The welding head mold (6) has an annular oil storage groove (21) on its rear end face, and the oil storage groove is connected to the axial heat dissipation channel (15) through a radial oil guide hole (22).

6. The ultrasonic welding die for plastic products according to claim 5, characterized in that, The quick-connector (3) has a stepped sealing cavity at the root of the internal thread (4), and a combined sealing ring is assembled in the cavity; The stepped amplitude rod (1) has an external thread (2) end with a chamfer. The inner hole of the locking nut (9) is provided with a V-shaped oil guide ring groove; The damping ring (8) has a waveform sealing groove machined on its end face.

7. The ultrasonic welding die for plastic products according to claim 6, characterized in that, The locking nut (9) has a multi-layer disc-shaped elastic component (24) on its end face; The quick-connector (3) has an annular limiting groove on the external thread (2) section, and an open elastic retaining ring is installed in the groove; The top of the cross boss (7) is machined with a micro-tapered mating surface; The stepped amplitude transformer (1) has a laser marking area on its surface.

8. The ultrasonic welding die for plastic products according to claim 7, characterized in that, The quick-connect connector (3) has axial positioning markings on its outer wall; A fluorescent positioning mark is embedded at the root of the cross-shaped boss (7); The locking nut (9) has equally spaced positioning notches on its outer edge; The stepped amplitude rod (1) has a tapered guide section machined at its end.

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