A drum-type ultrasonic device

Abstract

The application provides a drum type ultrasonic device, which comprises a rotating drum and a plurality of welding assemblies connected to the rotating drum, the plurality of welding assemblies are distributed along the circumference of the rotating drum, and the plurality of welding assemblies are configured to rotate with the rotating drum; the welding assembly comprises a correspondingly arranged ultrasonic welding head and an anvil; the ultrasonic welding head comprises an ultrasonic welding surface, the ultrasonic welding surface rotates with the rotating drum to form a circumferential line; two outer circumferential support plates are arranged on both sides of the ultrasonic welding surface, so that two outer circumferential support plates are arranged between adjacent two ultrasonic welding surfaces; two inner circumferential support plates are arranged between adjacent two outer circumferential support plates, and the inner circumferential support plates are arranged closer to the inner side of the radial direction than the outer circumferential support plates. The application can ensure the strength of the outer circumferential support plates, avoid the deformation of the circumferential ends of the outer circumferential support plates, and prevent problems such as relaxation and position deviation of the continuous sheet under the condition of high-speed operation of the equipment.

Description

Technical Field

[0001] This invention relates to the field of disposable hygiene product manufacturing equipment technology, and more particularly to baby pull-up diapers, adult pull-up diapers, and women's sanitary trousers, especially a drum-type ultrasonic device. Background Technology

[0002] In existing technologies, the welded portions on both sides of disposable wearable items (such as baby pull-up diapers, adult pull-up diapers, and women's sanitary panties) can be formed using a drum-type ultrasonic device. During the manufacturing process of disposable wearable items, the drum-type ultrasonic device welds a continuous sheet in a folded state. Specifically, it ultrasonically welds the side edges of the front abdomen and back of the disposable wearable item to form welded portions on both sides, thus creating a trouser-like shape with one waist opening and two leg openings. The drum-type ultrasonic device typically includes a rotating drum rotating at the same speed and at least one welding assembly. The welding assembly includes an ultrasonic welding head and an anvil positioned opposite each other to join the side edges of the front and back portions of the continuous sheet.

[0003] Chinese invention patent applications CN105934330A and CN116618350A both disclose a drum-type ultrasonic device. A continuous sheet is sandwiched between the anvil and the ultrasonic welding head of the welding assembly for ultrasonic welding. Support plates are provided on both sides of the ultrasonic welding surface to support the portion of the continuous sheet other than the welding section during the welding process. Since wearable items generally include a waistband and an absorbent core, and the absorbent core is a thick structure for absorbing excrement, relying solely on support plates to support the continuous sheet can easily cause deformation at both ends of the support plates in the circumferential direction. Furthermore, the large gap between adjacent support plates can lead to loosening and positional shifts in the continuous sheet during high-speed operation of the equipment. This results in deviations in the ultrasonic welding, poor welding accuracy, and ultimately, product defects. Summary of the Invention

[0004] This invention provides a drum-type ultrasonic device to solve the technical problems of easy deformation at both ends of the outer peripheral support plate of the drum-type ultrasonic device, and large gap between two adjacent outer peripheral support plates, which cause the continuous sheet to loosen and shift position when the equipment is running at high speed, resulting in deviation and poor welding accuracy in the drum-type ultrasonic welding, leading to defective products.

[0005] The technical solution provided by this invention is as follows:

[0006] The present invention provides a drum-type ultrasonic device, which is used to weld the two sides of the front abdomen and the two sides of the back of a folded continuous sheet together along the width direction of the continuous sheet perpendicular to the flow direction to form a welded part; wherein, the continuous sheet is a semi-finished product in the production process of disposable diapers and has been configured with an absorbent core, the absorbent core being disposed between the two welded parts.

[0007] The drum-type ultrasonic device includes a rotating drum and a plurality of welding components connected to the rotating drum. The plurality of welding components are distributed along the circumference of the rotating drum and are configured to rotate together with the rotating drum.

[0008] The multiple welding components distributed along the circumference of the rotating drum form a ring-shaped conveying path;

[0009] The welding assembly includes a corresponding ultrasonic welding head and an anvil, and the continuous sheet is disposed between the ultrasonic welding head and the anvil along the conveying path;

[0010] The ultrasonic welding head includes an ultrasonic welding surface, which is located at the front end of the ultrasonic welding head and forms a circumference as the rotating drum rotates.

[0011] The ultrasonic welding surface is provided with outer peripheral support plates on both sides of the circumference, so that there are two outer peripheral support plates between two adjacent ultrasonic welding surfaces.

[0012] Along the circumferential direction, the outer peripheral support plate is arc-shaped, and one end of the outer peripheral support plate near the ultrasonic welding surface is fixed to form a first fixed end; the other end of the outer peripheral support plate away from the ultrasonic welding surface extends along the circumferential line to form a first free end.

[0013] A gap is formed between the first free ends of two adjacent peripheral support plates to accommodate the absorbent core and the folded portion of the continuous sheet when the continuous sheet is welded together.

[0014] Two inner peripheral support plates are disposed between two adjacent outer peripheral support plates, and the inner peripheral support plates are disposed closer to the radial inner side than the outer peripheral support plates;

[0015] The inner peripheral support plate is fixed at one end near the ultrasonic welding head to form a second fixed end; the other end of the inner peripheral support plate away from the ultrasonic welding head extends into the gap formed between the first free ends of two adjacent outer peripheral support plates to form a second free end.

[0016] The second free ends of two adjacent inner peripheral support plates are close to each other and are located in the middle of the gap formed between the first free ends of two adjacent outer peripheral support plates.

[0017] In a preferred embodiment, the first free end of the outer peripheral support plate is bent or tilted toward the side corresponding to the inner peripheral support plate.

[0018] In a preferred embodiment, the second free end of the inner peripheral support plate is bent or tilted toward the interior of the rotating drum.

[0019] In a preferred embodiment, the distance between the second fixed end of the inner circumferential support plate and the circumference formed by the ultrasonic welding surface as the rotating drum rotates is greater than the distance between the second free end of the inner circumferential support plate and the circumference formed by the ultrasonic welding surface as the rotating drum rotates.

[0020] In a preferred embodiment, the width of the outer peripheral support plate in the width direction is greater than the width of the folded continuous sheet; the width of the inner peripheral support plate in the width direction is greater than the width of the folded continuous sheet.

[0021] In a preferred embodiment, the drum-type ultrasonic device further includes a plurality of welding head holders, which are distributed along the circumference of the rotating drum and fixed on the rotating drum.

[0022] The ultrasonic welding head is installed inside the welding head holder, and the ultrasonic welding surface extends out of the welding head holder.

[0023] In a preferred embodiment, the first fixed end of the outer peripheral support plate is fixed to the welding head retainer, and the second fixed end of the inner peripheral support plate is fixed to the side wall of the welding head retainer.

[0024] In a preferred embodiment, the anvil is configured to reciprocate along the width of the two sides of the front abdomen and the two sides of the back of the folded continuous sheet on the surface of the ultrasonic welding head.

[0025] In a preferred embodiment, the drum-type ultrasonic device further includes a moving mechanism connected to the anvil, the axis of which is perpendicular to the axis of the rotating drum.

[0026] The moving mechanism drives the anvil to reciprocate along the width of the folded continuous sheet on the surface of the ultrasonic welding head.

[0027] In a preferred embodiment, the floral pattern is evenly distributed on the circumferential surface of the anvil;

[0028] When the anvil moves back and forth on the surface of the ultrasonic welding head along the width direction of the folded continuous sheet, the uniformly distributed pattern on the circumferential surface of the anvil reliably forms the welded portion of the welding pattern on the folded continuous sheet.

[0029] In a preferred embodiment, the drum-type ultrasonic device further includes an inlet roller and an outlet roller; the inlet roller is used to inlet the folded continuous sheet into the drum-type ultrasonic device; the outlet roller is used to outlet the continuous sheet after the welded portion is formed out of the drum-type ultrasonic device.

[0030] In a preferred embodiment, the drum-type ultrasonic device further includes a plurality of first rollers, a plurality of second rollers, a first conveyor belt, and a second conveyor belt; the plurality of first rollers are arranged above the inlet roller and the outlet roller, and the first conveyor belt sequentially surrounds the outer periphery of the plurality of first rollers, the inlet roller, the annular conveying path, and the outlet roller; the plurality of second rollers are arranged outside the circumference of the annular conveying path, and the second conveyor belt sequentially surrounds the outer periphery of the second roller, the inlet roller, the annular conveying path, and the outlet roller, and the first conveyor belt and the second conveyor belt are arranged opposite to each other and clamp the crotch portion of the folded continuous sheet.

[0031] The above-described technical solution of the present invention has at least the following beneficial effects compared with the prior art:

[0032] This invention provides a drum-type ultrasonic device. Two outer peripheral support plates are disposed between two adjacent welding components on the drum-type ultrasonic device, and are located in the circumferential direction of the outer peripheral support plates. Two inner peripheral support plates are disposed between two adjacent outer peripheral support plates. Each inner peripheral support plate has a second fixed end near the ultrasonic welding head and a second free end away from the ultrasonic welding head, with the second free end being closer to the circumferential direction of the outer peripheral support plate. The inner peripheral support plates can accommodate multiple diameter drums and can be varied according to the diameter of the rotating drum. The width of both the outer and inner peripheral support plates is greater than the width of the folded continuous sheet. The inner peripheral support plates support the outer casing portion (front and back) and the absorber core of the continuous sheet, while the outer peripheral support plates support the corresponding outer casing portion (front and back) of the continuous sheet.

[0033] This invention provides a drum-type ultrasonic device that ensures the space for the absorber core to advance radially inward along the rotating drum, maintains the strength of the outer peripheral support plate, and avoids deformation of the circumferential ends of the outer peripheral support plate when the rotating drum rotates (also applicable to light and thin plates).

[0034] This invention provides a drum-type ultrasonic device. Because the inner peripheral support plate, located in the gap between the two outer peripheral support plates, can assist in supporting the continuous sheet, it can prevent problems such as loosening and positional shift of the continuous sheet under high-speed operation of the equipment, maintaining the stability of the continuous sheet's posture, improving welding accuracy, and avoiding the generation of defective products. Furthermore, the clamping of the folded crotch portion of the continuous sheet by the first and second conveyor belts further enhances the stability of the continuous sheet conveying, resulting in higher welding accuracy. The drum-type ultrasonic device of this invention is suitable for lightweight, multi-strength materials and can support materials such as outer casings and absorber cores without shifting. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a flowchart illustrating the manufacturing process of disposable diapers.

[0037] Figure 2 This is a schematic diagram of the structure of a drum-type ultrasonic device according to the present invention.

[0038] Figure 3 This is a schematic diagram of the continuous sheet body reciprocating along the width direction after being folded in the welding assembly of the present invention.

[0039] Figure 4 This is a schematic diagram of the structure of the adjacent fusion welding components, inner peripheral support plate, outer peripheral support plate and the continuous sheet body after clamping and folding in this invention.

[0040] Figure 5 This is a top view of the two adjacent outer peripheral support plates, the two inner peripheral support plates, and the outer peripheral support plates and inner peripheral support plates supporting the folded continuous sheet body of the present invention.

[0041] Figure 6 This is an enlarged schematic diagram showing the positional relationship between the inner and outer peripheral support plates.

[0042] Figure 7 This is a front view of the two adjacent outer peripheral support plates, the two inner peripheral support plates, and the outer peripheral support plates and inner peripheral support plates supporting the folded continuous sheet body of the present invention. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0044] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms “first,” “second,” and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an,” “a,” or “the,” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms “comprising,” “including,” or “including,” and similar terms mean that the element or object preceding the word encompasses the element or object listed following the word and its equivalents, without excluding other elements or objects. The terms “connected,” “linked,” or “connected,” and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect.

[0045] It should be noted that the terms "up", "down", "left", "right", "front", and "back" used in this invention are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0046] like Figure 1 As shown, the disposable diaper S has a front abdomen S1 positioned on the wearer's abdomen, a back S2 positioned on the wearer's buttocks, and a crotch S3 located between the front abdomen S1 and the back S2. The two side edges of the front abdomen S1 and the two side edges of the back S2 are fused together by a welding part J to close the disposable diaper S, thereby forming a pant-shaped shape with one waist opening and two leg openings.

[0047] Structurally, a disposable diaper S comprises an outer body M and an absorbent core T disposed inside the outer body M. The outer body M includes an inner nonwoven fabric layer facing the wearer's skin when worn, an outer nonwoven fabric layer facing the non-skin side when worn, and an elastic component sandwiched between the inner and outer nonwoven fabric layers, forming a continuous sheet W. The continuous sheet W is a semi-finished product in the disposable diaper manufacturing process and already contains the absorbent core T, which is positioned between two welded sections J. The absorbent core T is primarily a core structure for absorbing excrement, featuring a liquid-permeable surface sheet and a liquid-impermeable back sheet, as well as an absorbent core sandwiched between the liquid-permeable surface sheet and the liquid-impermeable back sheet.

[0048] like Figure 1 As shown, the manufacturing process of disposable diapers S includes: conveying process P1, leg opening forming process P2, absorbent core joining process P3, folding process P4, welding process P5, and cutting process P6.

[0049] In the conveying process P1, the continuous sheet W extending in the flow direction is conveyed along its length direction, where the length direction is consistent with the flow direction, and the CD direction is perpendicular to the flow direction, also known as the width direction.

[0050] In the leg opening forming process P2, a leg opening K is formed at the center of the continuous sheet W in the width direction (CD direction). The area between the two leg openings K of the continuous sheet W corresponds to the crotch S3. The two sides of the continuous sheet W in the width direction (CD direction) relative to the crotch S3 are the front abdomen S1 and the back S2, respectively.

[0051] In the absorber core bonding process P3, the absorber core T is bonded to the position between the two leg openings K in the continuous sheet W.

[0052] In folding step P4, the continuous sheet W containing the absorbent core T is folded in half along its width direction (CD direction), overlapping the front abdomen S1 and the back S2 of the continuous sheet W. The folded continuous sheet W is divided into a first part W1 and a second part W2. The first part W1 is located on the front side of the wearer's body, corresponding to the front abdomen S1. The second part W2 is located on the back side of the wearer's body, corresponding to the back S2.

[0053] In the welding process P5, ultrasonic welding is performed on the side edges of the first part W1 (front abdomen S1) and the second part W2 (back S2) of the folded continuous sheet W to form the welded part J.

[0054] In the cutting process P6, the continuous sheet W is cut along the width direction (CD direction) of the welded part J at the center position to form a single-piece disposable diaper S.

[0055] The present invention relates to an ultrasonic welding device for the welding process P5, which is a drum-shaped ultrasonic device used to weld the two sides of the front abdomen S1 (first part W1) and the two sides of the back S2 (second part W2) of the continuous sheet W after it has been folded in half together along the width direction (CD direction) of the continuous sheet W to form a welded part J.

[0056] like Figure 2As shown, according to an embodiment of the present invention, a drum-type ultrasonic device further includes an inlet roller N1 and an outlet roller N2. The inlet roller N1 is used to introduce the continuous sheet W, after being folded in the folding process P4, into the drum-type ultrasonic device. The outlet roller N2 is used to outlet the continuous sheet W after the welded portion J is formed from the drum-type ultrasonic device, and the welded continuous sheet W is then conveyed to the cutting process P6 for cutting.

[0057] Combination Figure 2 and Figure 3 According to an embodiment of the present invention, a drum-type ultrasonic device includes a rotating drum 1 and a plurality of welding components 2 connected to the rotating drum 1. The plurality of welding components 2 are distributed along the circumference of the rotating drum 1 and are configured to rotate together with the rotating drum 1.

[0058] Specifically, the rotating drum 1 has a cylindrical structure and is fixed to a drive shaft (not shown in the figure). The drive shaft is connected to a drive component and provides driving force for the rotation of the rotating drum 1, causing the rotating drum 1 to rotate around the rotation center C1. The rotation direction of the rotating drum 1 is as follows: Figure 2 As indicated by arrow a. In this embodiment, the rotation direction of the exemplary rotating drum 1 is clockwise. In some embodiments, the rotation direction of the rotating drum 1 can be counterclockwise, depending on the actual process layout.

[0059] In this embodiment, there are 10 welding components 2. Since the 10 welding components 2 have the same structure, the following embodiments will exemplarily describe the structure of one welding component 2. The number of welding components 2 is specifically set according to the specific size of the disposable diaper S. According to an embodiment of the present invention, the welding component 2 includes a correspondingly arranged ultrasonic welding head 21 and an anvil 22. The anvil 22 is configured to reciprocate on the surface of the ultrasonic welding head 21 and along the width direction (CD direction) of the two side edges of the front abdomen S1 and back S2 of the folded continuous sheet W. A plurality of welding components 2 distributed around the circumference of the rotating drum 1 form an annular conveying path L. The continuous sheet W is arranged between the ultrasonic welding head 21 and the anvil 22 along the conveying path L. The inlet roller N1 is arranged at the inlet of the annular conveying path L, and the outlet roller N2 is arranged at the outlet of the annular conveying path L.

[0060] Specifically, the drum-type ultrasonic device also includes a moving mechanism 3. The ultrasonic welding head 21 and the anvil 22 are arranged radially along the rotating drum 1. The ultrasonic welding head 21 is set along the width direction (CD direction). The moving mechanism 3 is connected to the anvil 22, which has a circular structure, and its axis is perpendicular to the axis of the rotating drum 1. The moving mechanism 3 drives the anvil 22 to reciprocate along the width direction (CD direction) of the folded continuous sheet W on the surface of the ultrasonic welding head 21. Specifically, it reciprocates along the width direction (CD direction) of the two sides of the front abdomen S1 (first part W1) and the two sides of the rear back S2 (second part W2) of the folded continuous sheet W. The ultrasonic welding head 21 and the anvil 22 perform ultrasonic welding on the continuous sheet W by clamping it. Figure 3 As shown.

[0061] Furthermore, the ultrasonic welding head 21 is connected to an ultrasonic generator (not shown), which provides ultrasonic energy to the ultrasonic welding head 21. Under the action of the moving mechanism 3, as the folded continuous sheet W rotates with the rotating drum 1, the anvil 22 reciprocates on the surface of the ultrasonic welding head 21 along the width direction (CD direction) of the folded continuous sheet W, and the ultrasonic generator applies ultrasonic vibration to the ultrasonic welding head 21 to weld the folded continuous sheet W.

[0062] In other words, while the anvil 22 rotates with the rotating drum 1, it reciprocates relative to the surface of the ultrasonic welding head 21 along the width direction (CD direction) of the folded continuous sheet W, so that during the reciprocating motion of the anvil 22 on the surface of the ultrasonic welding head 21, the outer peripheral surface of the anvil 22 is always in contact with the folded continuous sheet W.

[0063] like Figure 5 As shown, according to an embodiment of the present invention, the anvil 22 has a uniformly distributed pattern 221 on its circumferential surface. When the anvil 22 reciprocates on the surface of the ultrasonic welding head 21 along the width direction (CD direction) of the folded continuous sheet W, the uniformly distributed pattern 221 on the circumferential surface of the anvil 22 reliably forms a welded portion J of the welding pattern on the folded continuous sheet W. Specifically, the welded portion J of the welding pattern is reliably formed on both sides of the front belly S1 and the rear back S2 of the folded continuous sheet W.

[0064] Combination Figure 2 , Figure 4 , Figure 5 , Figure 6 and Figure 7According to an embodiment of the present invention, the drum-type ultrasonic device further includes a plurality of welding head holders 6, which are distributed around the circumference of the rotating drum 1 and fixed on the rotating drum 1. An ultrasonic welding head 21 is mounted inside the welding head holder 6. The ultrasonic welding head 21 includes an ultrasonic welding surface 21a (at the end away from the ultrasonic generator), which is located at the front end of the ultrasonic welding head 21 and extends out of the welding head holder 6.

[0065] According to an embodiment of the present invention, the ultrasonic welding surface 21a rotates with the rotating drum 1 to form a circumferential line C2. Outer peripheral support plates 4 are respectively provided on both sides of the ultrasonic welding surface 21a along the circumferential direction, so that there are two outer peripheral support plates 4 between two adjacent ultrasonic welding surfaces 21a. Figure 4 and Figure 6 As shown.

[0066] Along the circumferential direction, the outer peripheral support plate 4 is arc-shaped, and one end of the outer peripheral support plate 4 near the ultrasonic welding surface 21a is fixed to form a first fixed end 41. The other end of the outer peripheral support plate 4 away from the ultrasonic welding surface 21a extends along the circumferential line C2 to form a first free end 42, as shown below. Figure 6 As shown.

[0067] A gap is formed between the first free ends 42 of two adjacent outer peripheral support plates 4. During the welding of the continuous sheet W, this gap accommodates the absorbent core T between the welded portions J and the folded portion of the continuous sheet W. Specifically, during the welding process of the folded continuous sheet W, the absorbent core T and the corresponding portion of the folded continuous sheet W are located in the gap between the first free ends 42 of the two adjacent outer peripheral support plates 4. Figure 4 , Figure 5 and Figure 7 As shown.

[0068] The outer peripheral support plate 4 is used to support the front abdomen S1 (first part W1) and back S2 (second part W2) of the folded continuous sheet W, such as... Figure 4 , Figure 5 and Figure 7 As shown. Further, the first fixed end 41 of the outer peripheral support plate 4 is fixed to the welding head retainer 6, as... Figure 6 As shown.

[0069] According to an embodiment of the present invention, two inner peripheral support plates 5 are arranged between two adjacent outer peripheral support plates 4. The inner peripheral support plates 5 are arranged closer to the radially inner side than the outer peripheral support plates 4 (the inner peripheral support plates 5 are closer to the interior of the rotating drum 1 than the outer peripheral support plates 4), such as... Figure 6 As shown.

[0070] One end of the inner circumferential support plate 5 near the ultrasonic welding head 21 is fixed to form a second fixed end A. The other end of the inner circumferential support plate 5, away from the ultrasonic welding head 21, extends into the gap between the first free ends 42 of two adjacent outer circumferential support plates 4, forming a second free end B, as shown below. Figure 6 As shown.

[0071] The second free ends B of two adjacent inner peripheral support plates 5 are close to each other and located in the middle of the gap formed between the first free ends 42 of two adjacent outer peripheral support plates 4. The inner peripheral support plates 5 are used to support the absorbent core T between the welded portions J of the continuous sheet W, and the outer body portions corresponding to the front abdomen S1 (first part W1) and rear back S2 (second part W2) of the continuous sheet W. That is, during the welding process of the folded continuous sheet W, the absorbent core T and the portion of the continuous sheet W connected to the absorbent core T are located in the gap between the first free ends 42 of two adjacent outer peripheral support plates 4, and the absorbent core T and the portion of the continuous sheet W connected to the absorbent core T are supported by the inner peripheral support plates 5. Figure 4 , Figure 5 and Figure 7 As shown.

[0072] In other words, the portions of the continuous sheet W that are connected to the absorbent core T, including the anterior abdomen S1 (first part W1) and posterior back S2 (second part W2), and the absorbent core T being supported by the inner peripheral support plate 5, are as follows: Figure 4 , Figure 5 and Figure 7 As shown.

[0073] Furthermore, the second fixed end A of the inner circumferential support plate 5 is fixed to the side wall of the welding head retainer 6, as shown below. Figure 6 As shown.

[0074] In some embodiments, the inner peripheral support plate 5 may correspond to multiple rotating drums 1 of different diameters, or may be changed according to the diameter of the rotating drum 1.

[0075] According to an embodiment of the present invention, the first free end 42 of the outer peripheral support plate 4 is bent or inclined toward the side corresponding to the inner peripheral support plate 5. The second free end of the inner peripheral support plate 5 is bent or inclined toward the interior of the rotating drum, such as... Figure 4 , Figure 6 and Figure 7 As shown.

[0076] The distance d1 between the second fixed end A of the inner circumferential support plate 5 and the circumferential line C2 formed by the ultrasonic welding surface 21a as the rotating drum 1 rotates is greater than the distance d2 between the second free end B of the inner circumferential support plate 5 and the circumferential line C2 formed by the ultrasonic welding surface 21a as the rotating drum 1 rotates, i.e., d1 > d2. In other words, the second free end B of the inner circumferential support plate 5 is closer to the circumferential line C2 formed by the ultrasonic welding surface 21a as the rotating drum 1 rotates. This design allows the portions of the absorber core T, and the front abdomen S1 (first part W1) and rear back S2 (second part W2) of the continuous sheet W connected to the absorber core T, to be closer to the circumferential line C2. Simultaneously, it ensures that the continuous sheet W can be conveyed more stably and smoothly along the annular conveying path L when the equipment is operating at high speed. Figure 6 As shown.

[0077] like Figure 5 As shown, according to an embodiment of the present invention, along the width direction (CD direction, axial direction of rotating drum 1), the width L2 of the outer peripheral support plate 4 is greater than the width L1 of the folded continuous sheet W, and the width L3 of the inner peripheral support plate 5 is greater than the width L1 of the folded continuous sheet W, i.e., L2 > L1 and L3 > L1. In other words, the widths L2 of the outer peripheral support plate 4 and L3 of the inner peripheral support plate 5 are both greater than the width L1 of the folded continuous sheet W, thereby ensuring that the folded continuous sheet W can be fully supported, providing a prerequisite for the quality of ultrasonic welding and improving welding accuracy.

[0078] According to an embodiment of the present invention, a drum-type ultrasonic device further includes a plurality of first rollers F1, a plurality of second rollers F2, a first conveyor belt 7, and a second conveyor belt 8, as shown below. Figure 2 As shown; multiple first rollers F1 are arranged above the inlet roller N1 and the outlet roller N2, and the first conveyor belt 7 is sequentially wrapped around the multiple first rollers F1, the inlet roller N1, the annular conveyor path L and the outer periphery of the outlet roller N2.

[0079] Multiple second rollers F2 are arranged on the outer circumference of the annular conveyor path L, and the second conveyor belt 8 is sequentially wrapped around the outer circumference of the second rollers F2, the inlet roller N1, the annular conveyor path L, and the outlet roller N2.

[0080] like Figure 5 As shown, the first conveyor belt 7 and the second conveyor belt 8 are arranged opposite to each other and clamp the crotch S3 portion of the folded continuous sheet W. Under the clamping of the first conveyor belt 7 and the second conveyor belt 8, the continuous sheet W is guided by the guide roller N1 into the welding assembly 2 of the drum ultrasonic device for ultrasonic welding.

[0081] This invention provides an inner peripheral support plate 5 to support the front abdomen S1 (first part W1) and rear back S2 (second part W2) of the absorbent core T and the continuous sheet W connected to the absorbent core T. Since the absorbent core T includes a liquid-permeable surface sheet and a liquid-impermeable back sheet, as well as an absorbent core sandwiched between the liquid-permeable surface sheet and the liquid-impermeable back sheet, and the thickness of the absorbent core T is greater than that of the outer body M, this invention provides two inner peripheral support plates 5 between two adjacent welding components 2 and between two adjacent outer peripheral support plates 4. This ensures that the absorbent core T has space to advance radially inward along the rotating drum 1, maintains the strength of the outer peripheral support plates 4, and avoids deformation of the circumferential ends of the outer peripheral support plates 4 when the rotating drum 1 rotates (also applicable to light and thin plates). Even if the gap between the two outer peripheral support plates 4 is large, the folded continuous sheet W can still be supported by the inner peripheral support plates 5.

[0082] By providing auxiliary support with an inner peripheral support plate 5 in the gap between the two outer peripheral support plates 4, problems such as loosening and positional shifting of the folded continuous sheet W during high-speed operation can be prevented, maintaining the stability of the folded continuous sheet W's posture, improving welding accuracy, and avoiding the generation of defective products. Furthermore, the clamping of the crotch S3 portion of the folded continuous sheet W by the first conveyor belt 7 and the second conveyor belt 8 further enhances the stability of the continuous sheet W's transport and achieves higher welding accuracy. The drum-type ultrasonic device of this invention is suitable for lightweight, multi-strength materials and can support materials such as outer casings and absorber cores without shifting.

[0083] The following points need to be explained:

[0084] (1) The accompanying drawings of the embodiments of the present invention only involve the structures involved in the embodiments of the present invention. Other structures can refer to the general design.

[0085] (2) For clarity, the thickness of layers or regions is enlarged or reduced in the drawings used to describe embodiments of the present invention; that is, these drawings are not drawn to actual scale. It is understood that when an element such as a layer, film, region, or substrate is referred to as being “above” or “below” another element, the element may be “directly” located “above” or “below” the other element, or there may be intermediate elements.

[0086] (3) Where there is no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other to obtain new embodiments.

[0087] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. The scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A drum-type ultrasonic device, characterized in that, This is used to weld the two sides of the front abdomen and the two sides of the back of the folded continuous sheet together along the width direction of the continuous sheet perpendicular to the flow direction to form a welded part; wherein, the continuous sheet is a semi-finished product in the production process of disposable diapers and has been configured with an absorbent core, the absorbent core being configured between the two welded parts. The drum-type ultrasonic device includes a rotating drum and a plurality of welding components connected to the rotating drum. The plurality of welding components are distributed along the circumference of the rotating drum and are configured to rotate together with the rotating drum. The multiple welding components distributed along the circumference of the rotating drum form a ring-shaped conveying path; The welding assembly includes a corresponding ultrasonic welding head and an anvil, and the continuous sheet is disposed between the ultrasonic welding head and the anvil along the conveying path; The ultrasonic welding head includes an ultrasonic welding surface, which is located at the front end of the ultrasonic welding head and forms a circumference as the rotating drum rotates. The ultrasonic welding surface is provided with outer peripheral support plates on both sides of the circumference, so that there are two outer peripheral support plates between two adjacent ultrasonic welding surfaces. Along the circumferential direction, the outer peripheral support plate is arc-shaped, and one end of the outer peripheral support plate near the ultrasonic welding surface is fixed to form a first fixed end; the other end of the outer peripheral support plate away from the ultrasonic welding surface extends along the circumferential line to form a first free end. A gap is formed between the first free ends of two adjacent peripheral support plates to accommodate the absorbent core and the folded portion of the continuous sheet when the continuous sheet is welded together. Two inner peripheral support plates are disposed between two adjacent outer peripheral support plates, and the inner peripheral support plates are disposed closer to the radial inner side than the outer peripheral support plates; The inner peripheral support plate is fixed at one end near the ultrasonic welding head to form a second fixed end; the other end of the inner peripheral support plate away from the ultrasonic welding head extends into the gap formed between the first free ends of two adjacent outer peripheral support plates to form a second free end. The second free ends of two adjacent inner peripheral support plates are close to each other and are located in the middle of the gap formed between the first free ends of two adjacent outer peripheral support plates.

2. The drum-type ultrasonic device according to claim 1, characterized in that, The first free end of the outer peripheral support plate is bent or tilted toward the side corresponding to the inner peripheral support plate.

3. The drum-type ultrasonic device according to claim 1, characterized in that, The second free end of the inner peripheral support plate is bent or tilted toward the inside of the rotating drum.

4. The drum-type ultrasonic device according to claim 1, characterized in that, The distance between the second fixed end of the inner circumferential support plate and the circumference formed by the ultrasonic welding surface as the rotating drum rotates is greater than the distance between the second free end of the inner circumferential support plate and the circumference formed by the ultrasonic welding surface as the rotating drum rotates.

5. The drum-type ultrasonic device according to claim 1, characterized in that, The outer peripheral support plate is wider than the width of the folded continuous sheet in the width direction; the inner peripheral support plate is wider than the width of the folded continuous sheet in the width direction.

6. The drum-type ultrasonic device according to claim 1, characterized in that, The drum-type ultrasonic device also includes multiple welding head holders, which are distributed around the circumference of the rotating drum and fixed on the rotating drum; the ultrasonic welding head is installed inside the welding head holder, and the ultrasonic welding surface extends out of the welding head holder.

7. The drum-type ultrasonic device according to claim 6, characterized in that, The first fixed end of the outer peripheral support plate is fixed to the welding head retainer, and the second fixed end of the inner peripheral support plate is fixed to the side wall of the welding head retainer.

8. The drum-type ultrasonic device according to claim 1, characterized in that, The anvil is configured to reciprocate along the width of the two sides of the front abdomen and the two sides of the back of the folded continuous sheet on the surface of the ultrasonic welding head.

9. The drum-type ultrasonic device according to claim 8, characterized in that, The drum-type ultrasonic device also includes a moving mechanism connected to the anvil, the axis of which is perpendicular to the axis of the rotating drum. The moving mechanism drives the anvil to reciprocate along the width of the folded continuous sheet on the surface of the ultrasonic welding head.

10. The drum-type ultrasonic device according to claim 9, characterized in that, The anvil has a floral pattern evenly distributed on its circumference. When the anvil moves back and forth on the surface of the ultrasonic welding head along the width direction of the folded continuous sheet, the uniformly distributed pattern on the circumferential surface of the anvil reliably forms the welded portion of the welding pattern on the folded continuous sheet.

11. The drum-type ultrasonic device according to claim 1, characterized in that, The drum-type ultrasonic device also includes an inlet roller and an outlet roller; The infeed roller is used to guide the folded continuous sheet into the drum-type ultrasonic device; the outfeed roller is used to export the continuous sheet after the welded portion is formed from the drum-type ultrasonic device.

12. The drum-type ultrasonic device according to claim 11, characterized in that, The drum-type ultrasonic device also includes multiple first rollers, multiple second rollers, a first conveyor belt, and a second conveyor belt. Multiple first rollers are arranged above the inlet roller and the outlet roller, and the first conveyor belt is sequentially wrapped around the multiple first rollers, the inlet roller, the annular conveyor path and the outer periphery of the outlet roller; Multiple second rollers are arranged on the outer circumference of the annular conveying path. The second conveyor belt is sequentially wrapped around the outer circumference of the second roller, the inlet roller, the annular conveying path, and the outlet roller. The first conveyor belt and the second conveyor belt are arranged opposite to each other and clamp the crotch portion of the folded continuous sheet.

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