Ultrasonic welding device for sanitary products and welding machining method of ultrasonic welding device

Abstract

The invention discloses an ultrasonic welding device for sanitary products and a welding machining method of the ultrasonic welding device, and belongs to the field of sanitary product machining. The ultrasonic welding device is used for conducting ultrasonic welding treatment on the sanitary products and comprises a rotating body, an ultrasonic welding unit and a detection control unit, the sanitary products are attached to the outer circumferential face of the rotating body to be transmitted, the detection control unit is provided with a detector and a controller, and the detector is used for detecting the contact state of a welding head and a welding wheel. In the non-welding area, the welding wheel is in direct contact with the welding head, and the welding head does not work; during welding, a welded sanitary product is arranged between the welding wheel and the welding head, and the welding wheel and the welding head are in a non-contact state, so that the welding head works and completes the welding work of the sanitary product. When the welding device is used for welding, the welding wheel and the welding head can adapt to the welding area in a self-adaptive mode for sanitary products of different sizes, abrasion to the welding wheel and the welding head is greatly reduced, and the service life is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of sanitary product welding processing, and more particularly to an ultrasonic welding device and a welding processing method for sanitary products. Background Art

[0002] Ultrasonic welding devices are used in production lines for absorbent articles such as disposable underwear and diapers to weld stacked sheets together by applying ultrasonic vibrations. These devices include a drum that conveys the sheet material around its outer working surface, a welding head extending perpendicularly to the drum's rotational direction, and a welding wheel mounted for reciprocating motion transversely to the drum's outer working surface.

[0003] For example, Chinese patent publication number CN111572030A discloses an ultrasonic processing device and a processing method for sanitary products. During processing, an ultrasonic welding roller (i.e., a welding wheel) rolls axially on an ultrasonic vibrator (i.e., a welding head) while completing welding of specific positions of the sanitary product.

[0004] To ensure adequate welding, the welding head is typically longer than the part being welded, creating a non-welding area. Within this non-welding area, the welding wheel is still working, causing intense friction between the welding head and the wheel, leading to wear and tear on both ends, shortening their lifespan.

[0005] Patent WO2024204508A1 discloses wearable article manufacturing equipment. To address the wear problem between the welding wheel and the welding head, the welding wheel structure is improved to form different movement heights and avoid contact with the welding head in non-welding areas.

[0006] Patent JP2015130940A addresses the wear problem by forming an energy point near both ends of the welding area. That is, when the welding wheel reaches this point, the ultrasonic energy is reduced. When it reaches the edge of the welding area, the energy is reduced to a certain value and then enters the non-welding area, thereby avoiding wear in the non-welding area.

[0007] Patent DE6020140514243T2 discloses an ultrasonic welding device for disposable diapers. In order to avoid wear in the non-welding area, it is provided with an auxiliary wheel, which allows the welding wheel to shift within a set area, thereby avoiding the problem of wear.

[0008] The aforementioned solutions can address wear issues. However, considering that a single device needs to be compatible with welding products of varying sizes, i.e., with varying waist widths, the welding area will vary. Existing wear prevention methods mostly focus on a fixed area. This necessitates further adjustments to existing devices to accommodate the need for an adjustable welding area to prevent wear on the welding wheel and welding head. Summary of the Invention

[0009] 1. Technical problem to be solved by the invention

[0010] The present invention aims to overcome the drawback of the prior art in which the welding wheel and welding head are susceptible to wear during sanitary product welding. The invention provides an ultrasonic welding device and method for sanitary products. The device utilizes a detector to detect the contact state between the welding wheel and welding head, thereby controlling whether the welding head is energized. This prevents excessive wear of the welding wheel and welding head in non-welding areas, thereby extending the service life of the device.

[0011] 2. Technical solution

[0012] In order to achieve the above object, the technical solution provided by the present invention is:

[0013] The ultrasonic welding device for sanitary products of the present invention is used for ultrasonic welding sanitary products, comprising:

[0014] A rotating body, wherein the sanitary products are attached to the outer peripheral surface of the rotating body and transported;

[0015] an ultrasonic welding unit, which rotates around the central axis together with the rotating body; the ultrasonic welding unit comprises a welding wheel and a welding head; one of the welding wheel and the welding head is capable of reciprocating in the CD direction relative to the other;

[0016] A detection control unit comprises a detector and a controller, wherein the detector is used to detect the contact state between the welding head and the welding wheel and feed back the detection signal to the controller; the controller receives the signal from the detector and controls whether the welding head is energized;

[0017] In the non-welding area, when the welding head contacts the welding wheel, the detector detects the contact state and sends a signal to the controller, and the controller controls the welding head not to work; in the welding area, there is a sanitary product between the welding head and the welding wheel, the detector detects that the welding head and the welding wheel are in a non-contact state, sends a signal to the controller, and the controller controls the welding head to work and weld.

[0018] As a further improvement of the present invention, the detector utilizes a contact detector. This contact detector forms two wires, connected to a metal welding head and welding wheel, respectively, to monitor the contact status of the welding head and welding wheel in real time. In addition to this electrical conduction method, as other embodiments of the present invention, the detector may also utilize a visual detector, a displacement detector, or other methods to achieve online detection of the contact status between the welding head and welding wheel.

[0019] As a further improvement of the present invention, the rotating body is equipped with a coaxial slip ring mover and slip ring stator, the controller and the detector are fixedly arranged, and their wires are connected to the slip ring stator and are connected to the welding head and welding wheel after being led out from the slip ring mover.

[0020] As a further improvement of the present invention, the slip ring mover is installed on the drive shaft, and the rotating body is relatively fixed to the drive shaft; the wire of the contact detector is introduced from the inside of the drive shaft and passes through the side wall of the drive shaft to communicate with the welding head.

[0021] As a further improvement of the present invention, the welding head is located on the rotating body, and an insulating pad is provided at the bottom of the fixing seat of the welding head to insulate the welding head from the rotating body.

[0022] As a further improvement of the present invention, areas L2, L1, and L3 are formed on the welding head along the CD direction, wherein L1 is a non-contact area during welding of sanitary products, and L2 and L3 are reserved contact areas between the welding head and the welding wheel.

[0023] The ultrasonic welding device for sanitary products of the present invention is used for ultrasonic welding sanitary products, comprising:

[0024] A rotating body, wherein the sanitary products are attached to the outer peripheral surface of the rotating body and transported;

[0025] an ultrasonic welding unit, which rotates around the central axis together with the rotating body; the ultrasonic welding unit comprises a welding wheel and a welding head made of metal, wherein the welding wheel and the welding head are not connected in a non-contact state; and one of the welding wheel and the welding head is capable of reciprocating in the CD direction relative to the other;

[0026] A detection control unit comprises a detector and a controller, wherein the detector is a contact detector for detecting the contact state between the welding head and the welding wheel and feeding back a detection signal to the controller; the controller receives the signal from the detector and controls whether the welding head is energized;

[0027] Areas L2, L1, and L3 are sequentially arranged along the CD direction on the welding head, wherein L1 is a non-contact area during welding of sanitary products, and L2 and L3 are reserved contact areas between the welding head and the welding wheel;

[0028] In the non-welding area, when the welding head contacts the welding wheel, the detector detects the contact state and sends a signal to the controller, and the controller controls the welding head not to work; in the welding area, there is a sanitary product between the welding head and the welding wheel, the detector detects that the welding head and the welding wheel are in a non-contact state, sends a signal to the controller, and the controller controls the welding head to work and weld.

[0029] As a further improvement of the present invention, the welding wheel is mounted on a bracket, and the bracket is arranged along the CD direction and can move in the CD direction.

[0030] The ultrasonic welding method of a sanitary product of the present invention is performed using the aforementioned ultrasonic welding device. The sanitary product to be welded is attached to the outer peripheral surface of a rotating body for transmission. One of the welding wheel and the welding head in the ultrasonic welding unit can reciprocate relative to the other in the CD direction, so that the side of the sanitary product is welded. The specific ultrasonic welding process includes:

[0031] The welding wheel contacts the welding head in the L2 area. The detector detects the contact state and sends a signal to the controller, which controls the welding head to stop working.

[0032] When the welding wheel moves to the L1 area, there is a sanitary product between the welding head and the welding wheel. The detector detects that the welding head and the welding wheel are in a non-contact state and sends a signal to the controller. The controller controls the welding head to work and perform welding.

[0033] The welding wheel enters the L3 area and contacts the welding head again. The detector detects the contact state and sends a signal to the controller, which controls the welding head to stop working.

[0034] 3. Beneficial effects

[0035] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0036] The ultrasonic welding device for sanitary products of the present invention utilizes a detector to detect whether the welding wheel and welding head are in contact, thereby controlling whether the welding head is energized. In the non-welding area, the welding wheel and welding head are in direct contact, and the welding head is inactive. During welding, with the sanitary product being welded between the welding wheel and welding head, the welding head is able to activate welding, thus avoiding excessive wear on the welding wheel and welding head. Furthermore, when welding with this device, the welding wheel and welding head can adapt to the welding area for sanitary products of different sizes, eliminating the need for additional adjustment devices and significantly reducing the time required for code changes during production. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the welding area of the welded sanitary product;

[0038] Figure 2It is a structural schematic diagram of a welding device;

[0039] Figure 3 This is a schematic diagram of the welding area and non-welding area when the welding wheel and welding head cooperate.

[0040] Explanation of the numbers in the schematic diagram:

[0041] 01. Hygiene products; 01a. Sealing part;

[0042] 111, welding head; 112, fixing seat; 113, insulating pad; 121, welding wheel; 122, bracket;

[0043] 21. Rotating body; 22. Cam; 23. Drive shaft; 24. Support; 25. Bearing;

[0044] 31. Controller; 32. Contact detector; 321. Welding head wire; 322. Welding wheel wire; 33. Ultrasonic generator; 331. Ultrasonic high-frequency line;

[0045] 41. Slip ring stator; 42. Slip ring mover. DETAILED DESCRIPTION

[0046] In order to further understand the content of the present invention, the present invention is described in detail with reference to the accompanying drawings and embodiments.

[0047] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for understanding and reading by those familiar with this technology. They are not used to limit the conditions for implementation of the present invention and therefore have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the efficacy and purpose of the present invention. At the same time, terms such as "upper", "lower", "left", "right", and "middle" quoted in this specification are only for the convenience of description and are not used to limit the scope of implementation. Changes or adjustments in their relative relationships should also be considered as the scope of implementation of the present invention without substantially changing the technical content.

[0048] Figure 1 A sanitary product 01 is shown, which is a disposable diaper. The sanitary product 01 has a sealing portion 01a at the waist, and the sealing portion is processed by ultrasonic welding.

[0049] Figure 2 A schematic diagram of an ultrasonic welding device is shown, which is a cross-sectional schematic diagram.

[0050] This embodiment provides a sanitary product ultrasonic processing device for ultrasonic welding the sealing portion 01a. Figure 2The device comprises a rotating body 21, an ultrasonic welding unit, and a detection and control unit. The rotating body 21 is mounted on a drive shaft 23 and can rotate with the drive shaft 23. The outer periphery of the rotating body 21 is constructed with multiple adsorption units, which are evenly distributed along the circumference of the rotating body 21, generally 4 to 7. These adsorption units can use negative pressure to adsorb the sanitary products to be processed onto the surface for transportation. In some embodiments, a pressing mechanism can also be used to assist in pressing the sanitary products to ensure processing accuracy.

[0051] The ultrasonic welding unit is mounted on the rotating body 21 and rotates along with it about the central axis. Specifically, the ultrasonic welding unit comprises a welding wheel 121 and a welding head 111. The welding head 111 is capable of generating ultrasonic energy required for welding. To achieve welding, one of the welding wheel 121 and the welding head 111 is capable of reciprocating relative to the other in the CD direction. As a preferred embodiment, the following description assumes that the welding wheel 121 can move in the CD direction.

[0052] The CD direction referred to here is the axial direction of the rotating body 21. Movement in the CD direction refers to displacement in the axial direction, but this does not exclude simultaneous radial displacement, such as the radial rise and fall of the welding wheel 121 relative to the welding head 111. Multiple ultrasonic welding units are evenly spaced along the circumference of the rotating body 21.

[0053] It is worth noting that for the specific structure of the welding wheel 121 and the welding head 111, reference can be made to existing mechanisms such as the structure in ZL202010420593.2. In this patent solution, the welding wheel 121 can move relative to the welding head 111 to achieve ultrasonic welding.

[0054] While welding can be achieved in existing solutions, the contact between the welding wheel 121 and the welding head 111 causes significant wear, shortening the service life of the welding wheel 121 and the welding head 111. To address this issue, the solution of this embodiment provides a detection control unit comprising a detector and a controller 31. The detector is used to detect the contact status between the welding head 111 and the welding wheel 121 and to feed back a detection signal to the controller 31. The controller 31 receives the detector signal and controls whether the welding head 111 is energized.

[0055] The controller 31 controls the power of the welding head 111 through the ultrasonic generator 33. Specifically, the controller 31 is electrically connected to the ultrasonic generator 33, which communicates with the welding head 111 via an ultrasonic high-frequency line 331 to control the power of the welding head 111. The controller 31 can be a PLC controller or other controller capable of transmitting control signals, without specific limitation.

[0056] As for the specific detection method, the detector can be an image detector. For example, a camera can be set on the side or top of the welding head 111 to locate the position of the sanitary product 01. The contact between the welding wheel 121 and the welding head 111 can be determined based on the movement of the welding wheel 121. In the non-welding area, the detector sends a signal to the controller 31, and the controller 31 controls the welding head 111 to not generate power. When the detector detects that the welding wheel 121 has moved to the welding position, the welding wheel 121 has entered the welding area, and there is a sanitary product between the welding head 111 and the welding wheel 121, the detector detects and sends a signal to the controller 31, and the controller 31 controls the welding head 111 to generate power for welding.

[0057] Image detection, as a feasible solution, is difficult to make a relatively accurate contact determination. Because the welding wheel 121 has a certain volume, the only way to infer whether there is contact is to detect the moving position of the welding wheel 121. As an optimization, a contact detector can be used as a detector. In the non-welding area, when the welding head 111 is in contact with the welding wheel 121, the detector detects the contact state and sends a signal to the controller 31, and the controller 31 controls the welding head 111 not to work; in the welding area, there is a sanitary product between the welding head 111 and the welding wheel 121, and the detector detects that the welding head 111 and the welding wheel 121 are in a non-contact state, and sends a signal to the controller 31, and the controller 31 controls the welding head 111 to work for welding.

[0058] As a specific implementation method, Figure 2 The detector adopts a contact detector 32, which forms two wires, respectively connected to the welding head 111 and the welding wheel 121 made of metal material, and the contact status of the welding head 111 and the welding wheel 121 is monitored in real time through the contact detector 32.

[0059] Based on this embodiment, the welding wheel 121 and the welding head 111 are both made of metal and are not electrically connected. When the welding wheel 121 and the welding head 111 are in contact, a circuit is formed, and the signal transmitted by the contact detector 32 indicates that the welding wheel 121 and the welding head 111 are in contact.

[0060] In order to achieve non-electrical connection between the welding wheel 121 and the welding head 111, at least one of the welding wheel 121 or the welding head 111 needs to be installed in an insulated manner with respect to the rotating body 21. For example, the bracket 122 of the welding wheel 121 is made of non-conductive material, or the fixing base 112 of the welding head 111 is made of insulating material.

[0061] As an embodiment, an insulating pad 113 can be provided at the bottom of the fixing base 112 of the welding head 111 to prevent electrical conduction between the welding head 111 and the rotating body 21. On this basis, the welding head wire 321 led out from the detector is connected to the welding head 111, and another welding wheel wire 322 is connected to the welding wheel 121.

[0062] Since the welding wheel 121 mostly uses a metal bracket 122, a wire can be connected to the bracket 122 of the welding wheel 121 to achieve conduction between the wire and the welding wheel 121, without requiring direct connection to the component body.

[0063] Since the rotating body 21 is rotating, the contact detector 32 can perform wireless signal transmission with the controller 31 . This method requires the provision of corresponding signal receivers and signal transmitters.

[0064] To ensure more stable operation of the equipment, in one embodiment, wired signal transmission is used between the contact detector 32 and the controller 31. Specifically, the rotor 21 is equipped with a coaxial slip ring mover 42 and slip ring stator 41, and the slip ring stator 41 does not rotate. Two wires extending from the contact detector 32 are connected to the slip ring stator 41, and two wires extending from the slip ring mover 42 are connected to the welding head 111 and the welding wheel 121, respectively. When the rotor 21 rotates, the normal operation of the contact detector 32 is guaranteed.

[0065] Furthermore, the rotor 21 and the drive shaft 23 are relatively fixed, and the slip ring mover 42 is mounted on the drive shaft 23 and located at the end of the drive shaft 23. The drive shaft 23 has a wiring structure inside. The wires of the contact detector 32 are introduced from the inside of the drive shaft 23 and pass through the side wall of the drive shaft 23 to connect with the welding head 111. Based on this structure, the ultrasonic high-frequency line 331 can also be electrically connected through the cooperation of the slip ring stator 41 and the slip ring mover 42.

[0066] In order to adapt to products of different sizes, the length of the welding head 111 is greater than the length D1 of the waist sealing portion 01a of the sanitary product. Figure 3 The welding head 111 is formed with areas L2, L1, and L3 arranged in sequence along the CD direction. L1 is the non-contact area during welding of sanitary products, and L2 and L3 are reserved contact areas between the welding head 111 and the welding wheel 121. In this case, the length of L1 in the CD direction is equal to D1.

[0067] The use of the contact detector 32, on the one hand, prevents the welding head 111 from emitting power in the non-welding area, thereby avoiding wear on the welding head 111 and the welding wheel 121; on the other hand, when processing sanitary products of different sizes, no adjustment is required, and it can adapt to the welding area and the non-welding area, thereby avoiding the replacement and debugging of equipment parts.

[0068] As a specific embodiment, the ultrasonic welding device is used to ultrasonically weld sanitary products. A rotating body 21 is mounted on a drive shaft 23, and multiple adsorption units are formed on the outer edge of the rotating body 21. The sanitary products are attached to the outer circumference of the rotating body 21 and transported. The ultrasonic welding units rotate around the central axis along with the rotating body 21. The ultrasonic welding unit includes a metal welding wheel 121 and a welding head 111. The welding wheel 121 and the welding head 111 are not connected in a non-contact state. The welding wheel 121 is mounted on a bracket 122, which is arranged in the CD direction and can move in the CD direction. This allows the welding wheel 121 to reciprocate in the CD direction to weld the product on the welding head 111.

[0069] Bearings 25 are installed at both ends of the driving shaft 23, and a support 24 is installed on the bearing 25. A bearing 25 is set on the support 24 to support the rotating body 21. The outer end of the rotating body 21 is fixedly connected to the driving shaft 23, and the driving shaft 23 can drive the rotating body 21 to rotate.

[0070] An electrical control unit is provided on one side of the rotating body 21. This electrical control unit includes a detection control unit, which includes a detector and a controller 31. The detector is a contact detector 32, which is used to detect the contact state between the welding head 111 and the welding wheel 121 and feed the detection signal back to the controller 31. The controller 31 receives the signal from the detector and sends a signal to the ultrasonic generator 33 to control whether the welding head 111 is energized.

[0071] To ensure stable signal transmission, a slip ring mover 42 and a slip ring stator 41 are installed at the end of the drive shaft 23. The two wires of the contact detector 32 and the ultrasonic high-frequency line 331 of the ultrasonic generator 33 are connected to the slip ring stator 41, and then lead out through the slip ring mover 42 to the welding head 111 and the welding wheel 121. The welding head 111 is formed with areas L2, L1, and L3 arranged in sequence along the CD direction. Among them, L1 is the non-contact area when welding sanitary products, and L2 and L3 are reserved for the contact areas between the welding head 111 and the welding wheel 121.

[0072] In the non-welding area, when the welding head 111 is in contact with the welding wheel 121, the detector detects the contact state and sends a signal to the controller 31, and the controller 31 controls the welding head 111 not to generate power; in the welding area, there is a sanitary product between the welding head 111 and the welding wheel 121, and the detector detects that the welding head 111 and the welding wheel 121 are in a non-contact state, and sends a signal to the controller 31, and the controller 31 controls the welding head 111 to generate power for welding.

[0073] As an ultrasonic welding method for sanitary products, the aforementioned ultrasonic welding device is used for processing. The sanitary product to be welded is attached to the outer peripheral surface of the rotating body 21 and transported. One of the welding wheel 121 and the welding head 111 in the ultrasonic welding unit can reciprocate relative to the other in the CD direction. For example, the welding wheel 121 reciprocates in the CD direction, so that the waistline of the sanitary product is welded to form the sealing portion 01a. The specific ultrasonic welding process includes:

[0074] The welding wheel 121 contacts the welding head 111 in the L2 region. The detector detects this contact state and sends a signal to the controller 31, which controls the welding head 111 to not generate power. When the welding wheel 121 moves to the L1 region, there is a sanitary product between the welding head 111 and the welding wheel 121. The detector detects that the welding head 111 and the welding wheel 121 are in a non-contact state. The contact detector 32 sends a signal to the controller 31, which controls the welding head 111 to generate power and perform welding. The welding wheel 121 continues to move into the L3 region and contacts the welding head 111 again. The detector detects this contact state and sends a signal to the controller 31, which controls the welding head 111 to not generate power.

[0075] After welding is completed, the welding wheel 121 can move in the radial direction and then return to its initial position. The welded sanitary product is transported to the next process.

[0076] Furthermore, a cutting wheel can be integrated on the bracket 122 of the welding wheel 121 to perform cutting while welding, so that welding and cutting are performed synchronously, thereby avoiding misalignment of welding and cutting.

[0077] For other welding processes, reference can be made to existing welding steps, and the welding process can be transferred to the next station without any specific restrictions.

[0078] The above is a schematic description of the present invention and its embodiments, which is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by this and, without departing from the purpose of the present invention, designs a structure and embodiment similar to this technical solution without inventiveness, they shall fall within the scope of protection of the present invention.

Claims

1. An ultrasonic welding device for sanitary products, used for ultrasonic welding of sanitary products, characterized in that: include: A rotating body, wherein the sanitary products are attached to the outer peripheral surface of the rotating body and transported; an ultrasonic welding unit, which rotates around the central axis together with the rotating body; the ultrasonic welding unit comprises a welding wheel and a welding head; one of the welding wheel and the welding head is capable of reciprocating in the CD direction relative to the other; A detection control unit comprises a detector and a controller, wherein the detector is used to detect the contact state between the welding head and the welding wheel and feed back the detection signal to the controller; the controller receives the signal from the detector and controls whether the welding head is energized; In the non-welding area, when the welding head contacts the welding wheel, the detector detects the contact state and sends a signal to the controller, and the controller controls the welding head not to work; in the welding area, there is a sanitary product between the welding head and the welding wheel, the detector detects that the welding head and the welding wheel are in a non-contact state, sends a signal to the controller, and the controller controls the welding head to work and weld.

2. The ultrasonic welding device for sanitary products according to claim 1, characterized in that: The detector adopts a contact detector, which forms two wires, which are respectively connected to the welding head and welding wheel made of metal material, and monitors the contact status of the welding head and welding wheel in real time through the contact detector.

3. The ultrasonic welding device for sanitary products according to claim 2, characterized in that: The rotary body is equipped with a coaxial slip ring mover and slip ring stator. The controller and the detector are fixedly arranged. The wires thereof are connected to the slip ring stator and are led out from the slip ring mover to communicate with the welding head and the welding wheel.

4. The ultrasonic welding device for sanitary products according to claim 3, characterized in that: The slip ring mover is installed on the driving shaft, and the rotating body is relatively fixed to the driving shaft; the wire of the contact detector is introduced from the inside of the driving shaft and passes through the side wall of the driving shaft to communicate with the welding head.

5. The ultrasonic welding device for sanitary products according to claim 1, characterized in that: The welding head is located on the rotating body, and an insulating pad is provided at the bottom of the fixing seat of the welding head, so that the welding head and the rotating body are insulated.

6. The ultrasonic welding device for sanitary products according to claim 1, characterized in that: Areas L2, L1, and L3 are sequentially arranged along the CD direction on the welding head, wherein L1 is a non-contact area during welding of sanitary products, and L2 and L3 are reserved contact areas between the welding head and the welding wheel.

7. An ultrasonic welding device for sanitary products, used for ultrasonic welding of sanitary products, characterized in that: include: A rotating body, wherein the sanitary products are attached to the outer peripheral surface of the rotating body and transported; an ultrasonic welding unit, which rotates around the central axis together with the rotating body; the ultrasonic welding unit comprises a welding wheel and a welding head made of metal, wherein the welding wheel and the welding head are not connected in a non-contact state; and one of the welding wheel and the welding head is capable of reciprocating in the CD direction relative to the other; A detection control unit comprises a detector and a controller, wherein the detector is a contact detector for detecting the contact state between the welding head and the welding wheel and feeding back a detection signal to the controller; the controller receives the signal from the detector and controls whether the welding head is energized; Areas L2, L1, and L3 are sequentially arranged along the CD direction on the welding head, wherein L1 is a non-contact area during welding of sanitary products, and L2 and L3 are reserved contact areas between the welding head and the welding wheel; In the non-welding area, when the welding head contacts the welding wheel, the detector detects the contact state and sends a signal to the controller, which controls the welding head to stop working; In the welding area, there is a sanitary product between the welding head and the welding wheel. The detector detects that the welding head and the welding wheel are in a non-contact state and sends a signal to the controller. The controller controls the welding head to work and perform welding.

8. The ultrasonic welding device for sanitary products according to claim 7, characterized in that: The ultrasonic welding device has the features of claims 3-5.

9. The ultrasonic welding device for sanitary products according to claim 7, characterized in that: The welding wheel is mounted on a bracket, which is arranged along the CD direction and can move in the CD direction.

10. A method for ultrasonic welding of sanitary products, using the ultrasonic welding device according to any one of claims 1 to 9, characterized in that: The sanitary product to be welded is attached to the outer peripheral surface of the rotating body for transmission; one of the welding wheel and the welding head in the ultrasonic welding unit can reciprocate relative to the other in the CD direction, so that the side of the sanitary product is welded; the specific ultrasonic welding process includes: The welding wheel contacts the welding head in the L2 area. The detector detects the contact state and sends a signal to the controller, which controls the welding head to stop working. When the welding wheel moves to the L1 area, there is a sanitary product between the welding head and the welding wheel. The detector detects that the welding head and the welding wheel are in a non-contact state and sends a signal to the controller. The controller controls the welding head to work and perform welding. The welding wheel enters the L3 area and contacts the welding head again. The detector detects the contact state and sends a signal to the controller, which controls the welding head to stop working.

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