Ultrasonic welding device for front waist tape of paper diaper

Abstract

The invention relates to the field of hygienic product equipment, in particular to an ultrasonic welding device for front waist stickers of paper diapers, which comprises an ultrasonic spot welding unit, an ultrasonic strip welding unit and a conveying unit. The conveying unit is provided with a porous conveying belt capable of intermittently moving on the adsorption box, and the ultrasonic spot welding unit is provided with two adsorption transfer spot welding sets capable of intermittently rotating. By means of a rectangular-ambulatory-plane adsorption box of an adsorption box assembly of the ultrasonic spot welding unit and a plurality of round-point-shaped ultrasonic welding heads of a spot welding assembly, the front waist tape can be adsorbed, the front waist tape can be transferred to a paper diaper raw sheet on a first station to be positioned through intermittent rotation, and the front waist tape can be spot-welded to the paper diaper raw sheet; by means of the strip-shaped ultrasonic welding heads arranged at the two ends and in the middle of the pressing plate of the ultrasonic strip welding unit respectively, strip pressing welding can be conducted on the front waist tape laid on the paper diaper raw sheet on the secondary station, so that the binding force of the front waist tape and the paper diaper raw sheet can be enhanced, and the firmness and durability of the paper diaper in the wearing process can be improved.

Description

Technical Field

[0001] This invention relates to the field of hygiene product equipment, and more specifically to an ultrasonic welding device for the front waistband of diapers. Background Technology

[0002] The main function of the front waistband tabs on diapers is to secure the diaper and adjust its tightness using Velcro straps at the other end of the diaper, ensuring a snug fit and preventing leaks. The front waistband tabs are typically located at the front of the diaper's waistband, with Velcro straps on each of the two back wings. When putting on the diaper, these back Velcro straps adhere to the front waistband tabs to secure and adjust the diaper. Currently, most front waistband tabs are first cut into strips and then automatically transferred to the diaper sheet. They are then bonded to the diaper sheet using adhesive or ultrasonic welding. Because adhesive bonding is not good for infants' health, ultrasonic welding is currently the most common method for securing the front waistband tabs. However, large-area ultrasonic welding can cause extensive hardening at the joint between the front waistband tab and the diaper body, affecting the infant's comfort. Therefore, ultrasonic spot welding is now the most common method for securing the diaper. However, when using disposable diapers, the Velcro straps need to be glued to the front waistband for secure wearing. Due to the limited bonding strength of point welding, the front waistband can easily detach from the diaper body when the infant is frequently active or has a lot of soiling, affecting its use. Therefore, there is a need for an ultrasonic welding device for the front waistband, capable of applying strip welding to both ends and the middle of the front waistband in addition to point welding, to enhance the bonding strength between the front waistband and the diaper body, thereby improving the diaper's durability and longevity. In light of this, this case arose. Summary of the Invention

[0003] To overcome the shortcomings of the prior art, this invention discloses an ultrasonic welding device for the front waistband of a diaper. The invention comprises an ultrasonic spot welding unit, an ultrasonic strip welding unit, and a conveying unit. The conveying unit includes an adsorption box and a perforated annular conveyor belt surrounding the adsorption box. The perforated conveyor belt moves intermittently on the adsorption box, which can be configured with three stations. The perforated conveyor belt above the first and second stations can respectively adsorb the original diaper sheet. The ultrasonic spot welding unit and the ultrasonic strip welding unit are respectively positioned above the adsorption box of the conveying unit and on the same outer side of the perforated conveyor belt, corresponding to the first and second stations respectively. The ultrasonic spot welding unit has two sets of intermittently rotatable adsorption transfer spot welding groups. Each adsorption transfer spot welding group includes an adsorption box assembly and a spot welding assembly that can slide within the central hole of the adsorption box assembly. By utilizing several round ultrasonic welding heads on the adsorption box assembly and spot welding assembly, the pre-cut front waistband tape can be adsorbed and transferred to the corresponding diaper sheet at the first work station through intermittent rotation. The front waistband tape can also be spot welded to the diaper sheet. By utilizing the strip-shaped ultrasonic welding heads set at both ends and in the middle of the pressure plate of the ultrasonic strip welding unit, the front waistband tapes applied to the diaper sheet at the corresponding secondary work station can be strip-pressed and welded, thereby enhancing the bonding force between the front waistband tape and the diaper sheet and improving the firmness and durability of the diaper when worn.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] An ultrasonic welding device for the front waistband of diapers, which welds the front waistband to the original diaper sheet, is characterized by comprising an ultrasonic spot welding unit, an ultrasonic strip welding unit, a conveying unit, and a frame. The conveying unit has an adsorption box and a perforated annular conveyor belt surrounding the adsorption box. The perforated conveyor belt can move intermittently on the adsorption box. Three workstations can be set above the adsorption box, designated as the first workstation, the second workstation, and a non-adsorption workstation. The perforated conveyor belt above the first and second workstations can adsorb the original diaper sheets respectively. During the intermittent movement of the perforated conveyor belt, it can move each adsorbed original diaper sheet to the next adjacent workstation. The ultrasonic spot welding unit and the ultrasonic strip welding unit are both located above the adsorption box of the conveying unit and on the same outer side of the perforated conveyor belt. The installation positions of the ultrasonic spot welding unit and the ultrasonic strip welding unit correspond to the first and second workstations respectively. The ultrasonic spot welding unit is equipped with a rotating frame and two sets of adsorption transfer spot welding groups symmetrically fixed above and below the rotating frame. The rotating frame can drive the two sets of adsorption transfer spot welding groups to rotate intermittently. The adsorption transfer spot welding group is equipped with an adsorption box assembly and a spot welding assembly. The spot welding assembly is slidably connected in the hole set in the middle of the adsorption box assembly. The spot welding assembly is equipped with several round ultrasonic welding heads. The adsorption transfer spot welding group can adsorb the front waist patch and can transfer the front waist patch to the corresponding diaper sheet on the first work station after rotating downward by the rotating frame. It can also spot weld the front waist patch to the corresponding diaper sheet. The ultrasonic strip welding unit is equipped with a pressure plate and several strip-shaped ultrasonic welding heads on the pressure plate. The ultrasonic strip welding unit can perform strip pressing welding on the front waist patch applied to the diaper sheet on the corresponding secondary work station. The ultrasonic spot welding unit, ultrasonic strip welding unit and conveying unit are all connected to the frame.

[0006] The adsorption transfer spot welding assembly is also provided with a mounting plate, and the adsorption box assembly and the spot welding assembly are both movably connected to the mounting plate.

[0007] The adsorption box assembly includes a U-shaped adsorption box, slide bars, slide sleeves and springs. The U-shaped adsorption box is a box body in the shape of a U with a closed perimeter. The U-shaped adsorption box has an inner peripheral wall, an outer peripheral wall, a top wall and a bottom wall. The inner cavities of the U-shaped adsorption box are interconnected and are connected to a positive pressure air pump and a negative pressure air pump outside through an air duct joint and an electric reversing valve. The middle of its U-shaped structure is a square hole that penetrates up and down. A number of ventilation holes are densely arranged on the top wall of the U-shaped adsorption box, and the aperture of the ventilation holes is not greater than 2 mm. The top wall of the U-shaped adsorption box can adsorb the front waist sticker or make the adsorbed front waist sticker detach from the adsorption and transfer the front waist sticker to the corresponding diaper blank on the conveying unit for laying. The slide bars and slide sleeves are each two pieces. The two slide bars are symmetrically fixed on the bottom wall of the U-shaped adsorption box. The two slide sleeves are respectively slidably sleeved on the two slide bars. The slide sleeves are fixed on the flat plate provided on the frame. The springs are four pieces. Every two springs are sleeved on one slide bar and are respectively placed at both ends of the corresponding slide sleeve. The springs placed at the outer ends are limited by shoulders provided on the exposed ends of the slide bars.

[0008] The spot welding assembly includes a spot pressing plate, a first ultrasonic welder, a first driving cylinder, a first guide post and a first guide sleeve. The spot pressing plate is a square plate body and can slide in the square hole provided in the middle of the U-shaped adsorption box. The first ultrasonic welder has an ultrasonic generator, an oscillator and a circular dot-shaped welding head connected to the oscillator. The diameter of the circular dot-shaped welding head is not greater than 3 mm. The spot pressing plate is provided with a number of circular convex platforms protruding outwardly on one of its planes. The circular dot-shaped welding heads of the first ultrasonic welder are respectively provided on the number of circular convex platforms. One end of the first driving cylinder is connected to the frame, and the other end is hinged to the spot pressing plate. The first driving cylinder can drive the spot pressing plate to move and can make the circular dot-shaped welding head on the spot pressing plate contact the front waist sticker laid on the corresponding adsorbed diaper blank on the conveying unit. When the spot pressing plate moves, it can be guided by the first guide post and the first guide sleeve slidably connected to the first guide post. The first guide post and the first guide sleeve are each two pieces. The two first guide posts are placed on both sides of the first driving cylinder, and one end of the first guide post is fixed to the spot pressing plate. The other end of the first guide post is slidably inserted into the first guide sleeve. The first guide sleeve is fixed on the flat plate provided on the frame.

[0009] The rotating frame includes a rotating shaft, a rotary cylinder, a bearing seat and a support plate. The bearing seat and the support plate are each two pieces. A through hole is provided in the center of the support plate. The rotating shaft passes through the through holes in the centers of the two support plates placed at both ends of the rotating shaft and is fixed to the two support plates. Two groups of adsorption transfer spot welding groups are symmetrically fixed to both ends of the support plate with the center of the rotating shaft as the center. The rotating shaft is rotatably connected to the frame by two bearing seats. One end of the rotating shaft is connected to the cylinder rod of the rotary cylinder. The rotary cylinder is connected to the frame. The rotation speed of the rotary cylinder is adjustable and can rotate intermittently and forward and backward.

[0010] The ultrasonic welding unit is further equipped with a second ultrasonic welder, a second drive cylinder, a second guide post, and a second guide sleeve. The second ultrasonic welder is equipped with an ultrasonic generator, a vibrator, and a strip welding head connected to the vibrator. The pressure plate has outwardly protruding bosses at both ends and the middle below it, and each boss has a strip welding head of the second ultrasonic welder. The width of the strip welding head does not exceed 3mm. Preferably, two strip welding heads are provided on each boss. One end of the second drive cylinder is connected to the frame, and the other end is hinged to the pressure plate. The second drive cylinder can drive the pressure plate to move and can make all the strip welding heads on the pressure plate simultaneously contact the front waist patch of the corresponding diaper sheet adsorbed on the conveying unit. When the pressure plate moves, it can be guided by the second guide post and the second guide sleeve slidably connected to the second guide post. There are two second guide posts and two second guide sleeves. The two second guide posts are placed on both sides of the second drive cylinder, and one end of the second guide post is fixed to the pressure plate. The other end of the second guide post is slidably inserted into the second guide sleeve. The second guide sleeve is fixed to the flat plate of the frame.

[0011] The adsorption box includes a box body and a lid. The box body is a box-shaped component with peripheral walls and a bottom wall. The box body is connected to an external negative pressure air pump via a duct connector. The upper surface of the lid has a downwardly recessed groove in the middle, and several slots are densely arranged on two-thirds of the bottom wall of the groove. The conveying unit also includes a drive roller and a driven roller, which are respectively placed at both ends of the adsorption box. A ring-shaped porous conveyor belt is sleeved on the drive roller and the driven roller, and the upper half of the porous conveyor belt is placed in the groove on the lid of the adsorption box. Several ventilation holes are densely arranged on the belt body, and the diameter of the ventilation holes is no greater than 3mm. The upper surface of the upper half of the porous conveyor belt is flush with the upper surface of the lid. The area with several slots on the bottom wall of the groove corresponds to the first and second working positions of the adsorption box.

[0012] The drive roller is equipped with a drive motor, which is an adjustable speed motor and can rotate intermittently.

[0013] The first and second drive cylinders are preferably gas-liquid damping pressure cylinders with adjustable pressure.

[0014] The ultrasonic welding device for the front waistband of diapers also includes an electrical control system and a gas-liquid control unit. The electrical control system includes at least a control motherboard and a photoelectric switch for determining the stopping position when the conveying unit moves intermittently and the two sets of adsorption transfer spot welding groups rotate intermittently. The gas-liquid control unit includes an electromagnetic control valve. The first drive cylinder, the second drive cylinder, and the rotary cylinder are all connected to the gas-liquid control unit. The drive roller, the gas-liquid control unit, and the external air pump and electric reversing valve are all electrically connected to the electrical control system. The electrical control system can control the operation of the drive roller, the first drive cylinder, the second drive cylinder, the rotary cylinder, and the external air pump and electric reversing valve.

[0015] As can be seen from the above description, the beneficial effects of the ultrasonic welding device for the front waistband of diapers provided by the present invention are as follows: the conveying unit is provided with an adsorption box and an annular porous conveyor belt that is sleeved outside the adsorption box. The porous conveyor belt moves intermittently on the adsorption box, which can be set with three stations. The porous conveyor belt above the first station and the second station can adsorb the original diaper sheet respectively. The ultrasonic spot welding unit and the ultrasonic strip welding unit are respectively set above the adsorption box of the conveying unit and placed on the same outer side of the porous conveyor belt and corresponding to the first station and the second station respectively. The ultrasonic spot welding unit is provided with two sets of adsorption transfer spot welding groups that can rotate intermittently. The adsorption transfer spot welding group is provided with an adsorption box assembly and a spot welding assembly that can slide in the middle hole of the adsorption box assembly. This invention has three main advantages. First, it utilizes several circular ultrasonic welding heads on the adsorption box assembly and the spot welding assembly to adsorb the pre-cut front waistband tape and transfer it to the corresponding diaper sheet at the first work station through intermittent rotation. The front waistband tape can then be spot-welded onto the diaper sheet, completing the adsorption, transfer, and spot welding positioning of the front waistband tape in one step, saving space. Second, by integrating the adsorption, transfer, and spot welding positioning functions into a single component, it avoids the problem of inaccurate positioning that can occur when separate adsorption, transfer, and spot welding positioning are performed, requiring different mechanisms to work together, thus ensuring product consistency. Third, using strip-shaped ultrasonic welding heads at both ends and in the middle of the pressure plate of the ultrasonic strip welding unit, it can perform strip-pressure reinforcement welding on the front waistband tape applied to the diaper sheet at the corresponding secondary work station, thereby enhancing the bonding force between the front waistband tape and the diaper sheet and improving the diaper's durability and strength during wear. This invention is rationally designed, simple in structure, low in cost, and easy to promote. Attached Figure Description

[0016] Figure 1 This is a general schematic diagram of the ultrasonic welding device for the front waistband of diapers as described in this invention;

[0017] Figure 2 for Figure 1 A-direction diagram in the diagram;

[0018] Figure 3 This is an enlarged schematic diagram of an ultrasonic spot welding unit;

[0019] Figure 4 This is an enlarged schematic diagram of the adsorption transfer spot welding assembly;

[0020] Figure 5 This is an enlarged schematic diagram of the adsorption box assembly;

[0021] Figure 6 for Figure 5 A magnified diagram of BB in the image;

[0022] Figure 7This is an enlarged schematic diagram of the spot-welded assembly;

[0023] Figure 8 for Figure 7 Enlarged diagram of direction C in the diagram;

[0024] Figure 9 This is an enlarged schematic diagram of the rotating frame;

[0025] Figure 10 This is an enlarged schematic diagram of an ultrasonic bar welding unit;

[0026] Figure 11 for Figure 10 Enlarged diagram of direction D in the diagram;

[0027] Figure 12 This is a schematic diagram of the conveying unit;

[0028] Figure 13 This is a schematic diagram of the adsorption box;

[0029] Figure 14 for Figure 13 Enlarged diagram of direction E in the diagram;

[0030] Figure 15 for Figure 14 A magnified diagram of FF rotation in the image.

[0031] Figure label:

[0032] 1. Ultrasonic spot welding unit; 11. Adsorption transfer spot welding assembly; 111. Adsorption box assembly; 1111. U-shaped adsorption box; 1112. Slide rod; 1113. Slide sleeve; 1114. Spring; 112. Spot welding assembly; 1121. Spot pressure plate; 1122. First ultrasonic welder; 1123. First drive cylinder; 1124. First guide post; 1125. First guide sleeve; 113. Mounting plate; 12. Rotating frame; 121. Rotating shaft; 122. Rotary cylinder; 123. Bearing seat; 124. Support plate; 2. Ultrasonic bar welding unit; 21. Pressure plate; 22. Second ultrasonic welder; 23. Second drive cylinder; 24. Second guide post; 25. Second guide sleeve; 3. Conveying unit; 31. Drive roller; 32. Driven roller; 33. Perforated conveyor belt; 34. Adsorption box; 341. Box body; 342. Box cover; 3421. Groove; 3422. Slot; 4. Frame; 800. Diaper sheet; 900. Front waist tape. Detailed Implementation

[0033] The present invention will be further described below through specific embodiments.

[0034] like Figures 1 to 4 , Figure 10 , Figure 12As shown, the ultrasonic welding device for the front waistband of a diaper according to the present invention can weld the front waistband 900 to the diaper sheet 800. It includes an ultrasonic spot welding unit 1, an ultrasonic strip welding unit 2, a conveying unit 3, and a frame 4. The conveying unit 3 is equipped with a drive roller 31, a driven roller 32, a porous conveyor belt 33, and an adsorption box 34. The porous conveyor belt 33 is fitted over the adsorption box 34 and can move intermittently on the adsorption box 34. Three workstations can be set above the adsorption box 34, namely the first workstation, the second workstation, and the non-adsorption workstation. The porous conveyor belt 33 above the first and second workstations can adsorb the diaper sheets 800 respectively. When the porous conveyor belt 33 moves intermittently, it can drive the adsorbed sheets of diaper. The diaper sheet 800 moves to the next adjacent workstation; the ultrasonic spot welding unit 1 and ultrasonic strip welding unit 2 are both placed above the adsorption box 34 of the conveying unit 3 and on the same outer side of the porous conveyor belt 33. The installation positions of the ultrasonic spot welding unit 1 and ultrasonic strip welding unit 2 correspond to the first workstation and the next workstation, respectively; the ultrasonic spot welding unit 1 is equipped with a rotating frame 12 and two sets of adsorption transfer spot welding groups 11 symmetrically fixed above and below the rotating frame 12. The rotating frame 12 can drive the two sets of adsorption transfer spot welding groups... Group 11 rotates intermittently. The adsorption-transfer spot welding group 11 includes an adsorption box assembly 111, a spot welding assembly 112, and a mounting plate 113. The spot welding assembly 112 is slidably connected to a hole in the middle of the adsorption box assembly 111. Both the adsorption box assembly 111 and the spot welding assembly 112 are movably connected to the mounting plate 113. The spot welding assembly 112 has several round ultrasonic welding heads. The adsorption-transfer spot welding group 11 can adsorb the front waist sticker 90° and can be rotated downwards by the rotating frame 12 to transfer the front waist sticker. The front waist sticker 900 is transferred to the corresponding diaper sheet 800 at the first work station and positioned thereon. The front waist sticker 900 can be spot welded to the corresponding diaper sheet 800. The ultrasonic strip welding unit 2 is provided with a pressure plate 21 and several strip-shaped ultrasonic welding heads on the pressure plate 21. The ultrasonic strip welding unit 2 can perform strip pressing welding on the front waist sticker 900 applied to the diaper sheet 800 at the corresponding secondary work station. The ultrasonic spot welding unit 1, the ultrasonic strip welding unit 2 and the conveying unit 3 are all connected to the frame 4.

[0035] like Figures 1 to 6As shown, the adsorption box assembly 111 of the present invention includes a U-shaped adsorption box 1111, a sliding rod 1112, a sliding sleeve 1113, and a spring 1114. The U-shaped adsorption box 1111 is a box body in the shape of a U-shape and closed on all sides. The U-shaped adsorption box 1111 has an inner peripheral wall, an outer peripheral wall, a top wall, and a bottom wall. The inner cavity of the U-shaped adsorption box 1111 is interconnected and connected to an external positive pressure air pump and a negative pressure air pump via a duct connector and an electric reversing valve. The center of its U-shaped structure has a square hole that runs vertically through it. Several ventilation holes are densely arranged on the top wall of the U-shaped adsorption box 1111. The diameter of the ventilation holes is no greater than 2mm. The top wall of the U-shaped adsorption box 1111 can adsorb 90° of the front waist patch. 0 or the adsorbed front waist patch 900 can be detached from the adsorption and transferred to the corresponding diaper sheet 800 on the conveying unit 3 for application. There are two slide rods 1112 and two slide sleeves 1113. The two slide rods 1112 are symmetrically fixed to the bottom wall of the U-shaped adsorption box 1111. The two slide sleeves 1113 are slidably sleeved on the two slide rods 1112 respectively. The slide sleeves 1113 are fixed to the flat plate set on the frame 4. There are four springs 1114. Every two springs 1114 are sleeved on one slide rod 1112 and are placed at both ends of the corresponding slide sleeve 1113. The springs 1114 placed at the outer end are limited by the shoulder set on the exposed end of the slide rod 1112.

[0036] like Figures 1 to 8As shown, the spot-welded assembly 112 of the present invention includes a spot pressure plate 1121, a first ultrasonic welder 1122, a first drive cylinder 1123, a first guide post 1124, and a first guide sleeve 1125. The spot pressure plate 1121 is a square plate that can slide in the square hole provided in the middle of the U-shaped adsorption box 1111. The first ultrasonic welder 1122 is provided with an ultrasonic generator, a vibrator, and a dot-shaped welding head connected to the vibrator. The diameter of the dot-shaped welding head is no more than 3mm. The spot pressure plate 1121 has a plurality of outwardly protruding circular bosses distributed on one of its planes. The dot-shaped welding heads of the first ultrasonic welder 1122 are respectively provided on the plurality of circular bosses. One end of the first drive cylinder 1123 is connected to the frame 4, and the other end is hinged to the spot pressure plate 1121. In this embodiment, the first drive cylinder 1123 is a gas-liquid damping pressure cylinder with adjustable pressure. The first drive cylinder 1123 can drive the pressure plate 1121 to move and make the dot-shaped welding head on the pressure plate 1121 contact the front waist patch 900 applied on the corresponding diaper sheet 800 adsorbed on the conveying unit 3. When the pressure plate 1121 moves, it can be guided by the first guide post 1124 and the first guide sleeve 1125 slidably connected to the first guide post 1124. There are two of each of the first guide post 1124 and the first guide sleeve 1125. The two first guide posts 1124 are placed on both sides of the first drive cylinder 1123 and one end of the first guide post 1124 is fixed to the pressure plate 1121. The other end of the first guide post 1124 is slidably inserted into the first guide sleeve 1125. The first guide sleeve 1125 is fixed to the flat plate of the frame 4.

[0037] like Figures 1 to 9 As shown, the rotating frame 12 of the present invention includes a rotating shaft 121, a rotating cylinder 122, a bearing seat 123, and a support plate 124. There are two bearing seats 123 and two support plates 124. The support plate 124 has a through hole in its center. The rotating shaft 121 passes through the through hole in the center of the two support plates 124 located at both ends of the rotating shaft 121 and is fixedly connected to the two support plates 124. Two sets of adsorption transfer spot welding groups 11 are symmetrically fixed to both ends of the support plate 124 with respect to the rotating shaft 121. The rotating shaft 121 is rotatably connected to the frame 4 by the two bearing seats 123. One end of the rotating shaft 121 is connected to the cylinder rod of the rotating cylinder 122. The rotating cylinder 122 is connected to the frame 4. The rotation speed of the rotating cylinder 122 is adjustable and it can rotate intermittently and in both directions.

[0038] like Figure 1 , Figure 2 , Figure 10 and Figure 11As shown, the ultrasonic bar welding unit 2 of the present invention is further provided with a second ultrasonic welder 22, a second drive cylinder 23, a second guide post 24 and a second guide sleeve 25. The second ultrasonic welder 22 is provided with an ultrasonic generator, a vibrator and a bar-shaped welding head connected to the vibrator. The pressure plate 21 is provided with outward protrusions at both ends and the middle below it, and each of the protrusions is provided with a bar-shaped welding head of the second ultrasonic welder 22. The width of the bar-shaped welding head does not exceed 3mm. In this embodiment, two bar-shaped welding heads are provided on each protrusion. One end of the second drive cylinder 23 is connected to the frame 4, and the other end is hinged to the pressure plate 21. In this embodiment, the second drive cylinder 23 is a gas-liquid damping pressure cylinder, and its pressure is adjustable. The second drive cylinder 23 can drive the pressure plate 21 to move and make all the strip welding heads on the pressure plate 21 simultaneously contact the front waist patch 900 applied on the corresponding diaper sheet 800 adsorbed on the conveying unit 3. When the pressure plate 21 moves, it can be guided by the second guide post 24 and the second guide sleeve 25 slidably connected to the second guide post 24. There are two of each of the second guide post 24 and the second guide sleeve 25. The two second guide posts 24 are placed on both sides of the second drive cylinder 23 and one end of the second guide post 24 is fixed to the pressure plate 21. The other end of the second guide post 24 is slidably inserted into the second guide sleeve 25. The second guide sleeve 25 is fixed to the flat plate set on the frame 4.

[0039] like Figure 1 , Figure 2 , Figures 12 to 15 As shown, the adsorption box 34 of the present invention includes a box body 341 and a box cover 342. The box body 341 is a box-shaped component with peripheral walls and a bottom wall. The box body 341 is connected to an external negative pressure air pump via a duct connector. The upper surface of the box cover 342 has a downwardly recessed groove 3421 in the middle, and a plurality of slots 3422 are densely arranged on two-thirds of the bottom wall of the groove 3421. The driving roller 31 and the driven roller 32 are respectively placed at both ends of the adsorption box 34. The annular porous conveyor belt... The conveyor belt 33 is fitted onto the drive roller 31 and the driven roller 32, with the upper half of the perforated conveyor belt 33 placed in the groove 3421 on the cover 342 of the adsorption box 34. The perforated conveyor belt 33 has a densely packed number of ventilation holes, each with a diameter not exceeding 3mm. The upper surface of the upper half of the perforated conveyor belt 33 is flush with the upper surface of the cover 342. The area with several slots 3422 on the bottom wall of the groove 3421 corresponds to the first and second working positions of the adsorption box 34. The drive roller 31 is equipped with a drive motor, which is an adjustable speed motor capable of intermittent rotation.

[0040] like Figures 1 to 15As shown, the ultrasonic welding device for the front waistband of diapers according to the present invention further includes an electrical control system and a gas-liquid control unit. The electrical control system includes at least a control motherboard and a photoelectric switch for determining the stopping position when the conveying unit 3 moves intermittently and the two sets of adsorption transfer spot welding groups 11 rotate intermittently. The gas-liquid control unit includes an electromagnetic control valve. The first drive cylinder 1123, the second drive cylinder 23 and the rotary cylinder 122 are all connected to the gas-liquid control unit. The drive roller 31, the gas-liquid control unit and the external air pump and electric reversing valve are all electrically connected to the electrical control system. The electrical control system can control the operation of the drive roller 31, the first drive cylinder 1123, the second drive cylinder 23, the rotary cylinder 122 and the external air pump and electric reversing valve.

[0041] The method of using the ultrasonic welding device for the front waistband of diapers described in this invention is as follows:

[0042] To simplify the description, we first set the first station, the second station and the non-absorption station above the adsorption box 34 as stations P1, P2 and P3 respectively. The original diaper sheet 800 at station P3 was not adsorbed.

[0043] When using this ultrasonic welding device, the electrical control system is first activated, and an external negative pressure fan provides negative pressure to the U-shaped adsorption box 1111 of the adsorption box assembly 111 and the adsorption box 34 of the conveying unit 3. The rotating cylinder 122 of the rotating frame 12 and the drive roller 31 of the conveying unit 3 are then activated, causing the two sets of adsorption transfer spot welding groups 11 of the ultrasonic spot welding unit 1 to rotate intermittently and the porous conveyor belt 33 of the conveying unit 3 to move intermittently. During the intermittent pauses of the porous conveyor belt 33, a diaper sheet 800 is placed on the porous conveyor belt 33 at station P1. The diaper is then adsorbed; after a set of adsorption transfer spot welding groups 11 rotates intermittently and stops at the top, a strip-shaped front waist patch 900 provided externally is placed on the upper surface of the U-shaped adsorption box 1111 of the adsorption transfer spot welding group 11 and adsorbed; the adsorption transfer spot welding group 11 rotates intermittently under the drive of the rotating frame 12, causing this set of adsorption transfer spot welding groups 11 with the front waist patch 900 adsorbed to rotate downwards and align with the diaper original sheet 800 adsorbed at station P1; the command to rotate downwards and adsorb the U-shaped adsorption box 1111 of the adsorption transfer spot welding group 11 with the front waist patch 900 is then executed. The electric reversing valve connected to the auxiliary box 1111 is switched to connect with the positive pressure air pump, causing the front waist patch 900 to release its adsorption and quickly be applied to the corresponding diaper sheet 800; at the same time, the first ultrasonic welder 1122 and the first drive cylinder 1123 of the spot welding assembly 112 of this set of adsorption transfer spot welding group 11 are activated to spot weld the front waist patch 900 to the corresponding diaper sheet 800; then the electric reversing valve connected to the auxiliary box 1111 is switched to connect with the negative pressure air pump; at this time, another set of adsorption transfer spot welding group 11 has rotated to the top and The next front waist tab 900 provided externally is adsorbed. After the spot welding of the front waist tab 900 at station P1 is completed, the instruction conveying unit 3 drives the porous conveyor belt 33 forward to send the diaper sheet 800 with the spot-welded front waist tab 900 at station P1 to station P2. The instruction ultrasonic bar welding unit 2 above station P2 activates its second ultrasonic welder 22 and second drive cylinder 23 to perform bar pressing welding on the front waist tab 900 on the diaper sheet 800 at station P2. At this time, the next diaper sheet 800 provided externally is placed back on station P1. Repeating the above actions, the next front waist tab 900 is applied to the next diaper sheet 800 and spot-welded and bar-pressed, thus realizing a continuous production line operation. After the bar pressing welding of the diaper sheet 800 at station P2, the porous conveyor belt 33 will send it to station P3, where it can be picked up by the external picking mechanism.

[0044] This invention utilizes several round ultrasonic welding heads on the adsorption box assembly 111 and the spot welding assembly 112 to adsorb the pre-cut front waist patch 900 and transfer it to the corresponding diaper sheet 800 at the first work station through intermittent rotation. The front waist patch 900 can also be spot welded to the diaper sheet 800. Using the strip-shaped ultrasonic welding heads respectively set at both ends and in the middle of the pressure plate 21 of the ultrasonic strip welding unit 2, the front waist patch 900 applied to the diaper sheet 800 at the corresponding secondary work station can be strip-pressed and welded, thereby enhancing the bonding force between the front waist patch and the diaper sheet 800 and improving the firmness and durability of the diaper when worn.

[0045] The above is only one specific embodiment of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantial modifications made to the present invention using this concept shall be considered as infringing the protection scope of the present invention.

Claims

1. An ultrasonic welding device for the front waistband of a diaper, the device being able to weld the front waistband (900) to the diaper sheet (800), characterized in that: The system includes an ultrasonic spot welding unit (1), an ultrasonic bar welding unit (2), a conveying unit (3), and a frame (4). The conveying unit (3) is equipped with an adsorption box (34) and a ring-shaped porous conveyor belt (33) that surrounds the adsorption box (34). The porous conveyor belt (33) can move intermittently on the adsorption box (34). Three workstations can be set above the adsorption box (34), which are respectively designated as the first workstation, the second workstation, and the non-adsorption workstation. The porous conveyor belt (33) above the first workstation and the second workstation can adsorb the original diaper sheet (800) respectively. When the belt (33) moves intermittently, it can move the adsorbed diaper sheets (800) to the next adjacent work station. The ultrasonic spot welding unit (1) and the ultrasonic strip welding unit (2) are both placed above the adsorption box (34) of the conveying unit (3) and on the same outer side of the porous conveyor belt (33). The installation positions of the ultrasonic spot welding unit (1) and the ultrasonic strip welding unit (2) correspond to the first work station and the second work station, respectively. The ultrasonic spot welding unit (1) is provided with a rotating frame (12) and two sets of suction tubes symmetrically fixed above and below the rotating frame (12). The attached transfer spot welding assembly (11) has a rotating frame (12) that can drive two sets of adsorption transfer spot welding assemblies (11) to rotate intermittently. The adsorption transfer spot welding assembly (11) is provided with an adsorption box assembly (111) and a spot welding assembly (112). The spot welding assembly (112) is slidably connected in the hole provided in the middle of the adsorption box assembly (111). The spot welding assembly (112) is provided with several round ultrasonic welding heads. The adsorption transfer spot welding assembly (11) can adsorb the front waist patch (900) and can transfer the front waist patch (900) to the desired location by rotating downwards through the rotating frame (12). The corresponding diaper sheet (800) is positioned on the first work station, and the front waist sticker (900) can be spot welded to the corresponding diaper sheet (800). The ultrasonic strip welding unit (2) is provided with a pressure plate (21) and a number of strip-shaped ultrasonic welding heads are provided on the pressure plate (21). The ultrasonic strip welding unit (2) can perform strip pressing welding on the front waist sticker (900) laid on the corresponding secondary work station diaper sheet (800). The ultrasonic spot welding unit (1), ultrasonic strip welding unit (2) and conveying unit (3) are all connected to the frame (4).

2. The ultrasonic welding device for the front waistband of a diaper according to claim 1, characterized in that: The adsorption transfer spot welding assembly (11) is also provided with a mounting plate (113), and the adsorption box assembly (111) and the spot welding assembly (112) are both movably connected to the mounting plate (113).

3. The ultrasonic welding device for the front waistband of a diaper according to claim 2, characterized in that: The adsorption box assembly (111) includes a U-shaped adsorption box (1111), a sliding rod (1112), a sliding sleeve (1113), and a spring (1114). The U-shaped adsorption box (1111) has an inner peripheral wall, an outer peripheral wall, a top wall, and a bottom wall. The center of its U-shaped structure has a vertically penetrating square hole. Several ventilation holes are densely arranged on the top wall of the U-shaped adsorption box (1111). The top wall of the U-shaped adsorption box (1111) can adsorb the front waist patch (900). There are two slide rods (1112) and two slide sleeves (1113). The two slide rods (1112) are symmetrically fixed to the bottom wall of the U-shaped adsorption box (1111). The two slide sleeves (1113) are slidably sleeved on the two slide rods (1112) respectively. The slide sleeves (1113) are fixed to the frame (4). There are four springs (1114). Every two springs (1114) are sleeved on one slide rod (1112) and placed at both ends of the corresponding slide sleeves (1113).

4. The ultrasonic welding device for the front waistband of a diaper according to claim 3, characterized in that: The spot-welded assembly (112) includes a spot pressure plate (1121), a first ultrasonic welder (1122), a first drive cylinder (1123), a first guide post (1124), and a first guide sleeve (1125). The spot pressure plate (1121) is a square plate that can slide in the square hole provided in the middle of the U-shaped adsorption box (1111). The first ultrasonic welder (1122) is provided with an ultrasonic generator, a vibrator, and a dot-shaped welding head connected to the vibrator. The spot pressure plate (1121) is divided on one of its planes. The device is provided with several outwardly protruding circular bosses, and the circular welding heads of the first ultrasonic welder (1122) are respectively provided on the several circular bosses. One end of the first drive cylinder (1123) is connected to the frame (4), and the other end is hinged to the pressure plate (1121). The first drive cylinder (1123) can drive the pressure plate (1121) to move. When the pressure plate (1121) moves, it can be guided by the first guide post (1124) and the first guide sleeve (1125) slidably connected to the first guide post (1124).

5. The ultrasonic welding device for the front waistband of a diaper according to claim 4, characterized in that: The rotating frame (12) includes a rotating shaft (121), a rotary cylinder (122), a bearing seat (123), and a support plate (124). There are two bearing seats (123) and two support plates (124). The support plate (124) has a through hole in its center. The rotating shaft (121) passes through the through hole in the center of the two support plates (124) and is fixedly connected to the two support plates (124). Two sets of adsorption transfer spot welding groups (11) are symmetrically fixed at both ends of the support plate (124). The rotating shaft (121) is rotatably connected to the frame (4) by the two bearing seats (123). One end of the rotating shaft (121) is connected to the cylinder rod of the rotary cylinder (122).

6. The ultrasonic welding device for the front waistband of a diaper according to claim 5, characterized in that: The ultrasonic bar welding unit (2) is also provided with a second ultrasonic welder (22), a second drive cylinder (23), a second guide post (24), and a second guide sleeve (25). The second ultrasonic welder (22) is provided with an ultrasonic generator, a vibrator, and a bar-shaped welding head connected to the vibrator. The pressure plate (21) is provided with protruding bosses at both ends and in the middle below it, and each boss is provided with a bar-shaped welding head of the second ultrasonic welder (22). One end of the second drive cylinder (23) is connected to the frame (4), and the other end is hinged to the pressure plate (21). The second drive cylinder (23) can drive the pressure plate (21) to move. When the pressure plate (21) moves, it can be guided by the second guide post (24) and the second guide sleeve (25) slidably connected to the second guide post (24).

7. The ultrasonic welding device for the front waistband of a diaper according to claim 6, characterized in that: The adsorption box (34) includes a box body (341) and a box cover (342). The box body (341) is a box-shaped component with a peripheral wall and a bottom wall. The box cover (342) has a downwardly recessed groove (3421) in the middle of its upper surface, and a number of slots (3422) are densely arranged in two-thirds of the bottom wall area of ​​the groove (3421). The conveying unit (3) is also provided with a driving roller (31) and a driven roller (32). The cylinder (31) and the driven roller (32) are placed at both ends of the adsorption box (34). The annular porous conveyor belt (33) is sleeved on the drive roller (31) and the driven roller (32), and the upper half of the porous conveyor belt (33) is placed in the groove (3421) on the box cover (342) of the adsorption box (34). The area with several slots (3422) on the bottom wall of the groove (3421) corresponds to the area of ​​the first station and the second station of the adsorption box (34).

8. The ultrasonic welding device for the front waistband of a diaper according to claim 7, characterized in that: It also includes an electronic control system and a gas-liquid control unit. The gas-liquid control unit includes an electromagnetic control valve. The first drive cylinder (1123), the second drive cylinder (23), and the rotary cylinder (122) are all connected to the gas-liquid control unit. The drive roller (31) and the gas-liquid control unit are both electrically connected to the electronic control system. The electronic control system can control the operation of the drive roller (31), the first drive cylinder (1123), the second drive cylinder (23), and the rotary cylinder (122).

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