A disinfection device for paper diaper production

Abstract

This invention discloses a disinfection device for diaper production, belonging to the field of diaper production disinfection technology. It mainly includes a frame, with unfolding rollers rotatably connected to the upper left and lower right parts of the frame. Squeezing discs are fixedly connected to the inner walls of the upper left and lower right parts of the frame. The unfolding rollers include a mounting tube, an expansion mechanism, an auxiliary mechanism, an adjustment mechanism, and a lifting assembly. The auxiliary mechanism is fixedly installed in the middle of the mounting tube, and the expansion mechanism is installed on both sides of the auxiliary mechanism. Multiple sets of slots are formed along the circumferential direction on the auxiliary mechanism. The expansion mechanism includes an outer mounting plate, a mounting frame, an inner mounting plate, and an expansion slider. This invention uses the unfolding rollers in conjunction with full-area negative pressure adsorption to flatten the diapers in sections, eliminating blind spots in the irradiation of wrinkles, ensuring that both sides are fully exposed to ultraviolet light for disinfection, resulting in a sterilization effect far superior to traditional equipment. This invention is mainly used for disinfection operations on diaper production lines.

Description

Technical Field

[0001] This invention belongs to the field of disinfection technology in diaper production, and more specifically, relates to a disinfection device for diaper production. Background Technology

[0002] Disposable diapers are disposable hygiene consumables that are worn in close contact with infants' delicate skin for extended periods. If bacteria, fungi, pathogens, or other harmful microorganisms grow or remain inside the diaper, it can not only cause skin rashes and itching, but also significantly increase the risk of urinary tract infections in infants, negatively impacting their growth and health. Therefore, diaper production lines need to add a finished product disinfection process to control and disinfect the produced diapers.

[0003] Chinese Patent Publication No. CN112336885A discloses a disinfection structure for diaper production, including a first conveying device, a primary disinfection device, a secondary disinfection device, a tertiary disinfection device, a transfer device, and a temporary storage box arranged sequentially along the process, and also includes tooling for placing diapers; the primary disinfection device includes a frame and a disinfection component installed on the frame for primary spray disinfection; the secondary disinfection device includes a second conveying device and a drying component installed on the second conveying device; the tertiary disinfection device includes a third conveying device and an auxiliary component installed on the third conveying device; this provides a disinfection structure for diaper production that solves the problem of poor disinfection effect and inability to thoroughly and evenly disinfect diapers in existing disinfection devices.

[0004] During later use, the device still had the following problems: disinfection still mainly relied on a single linear process of spraying → drying → fixed-point ultraviolet irradiation; after the diaper core, leak-proof side panels, elastic bands and adhesive structure were formed, the finished product naturally had local bulges, folds, overlaps and micro-wrinkles, which were supported by the tooling in an almost two-dimensional posture through the irradiation area, resulting in ultraviolet rays forming irradiation blind spots / insufficient dose areas at the root of the wrinkles, the overlapping shadow area and the side away from the lamp tube; at the same time, the micro gaps between the absorbent core layer and the surface layer were also difficult to be effectively covered by surface ultraviolet rays, making "comprehensive and uniform disinfection" unstable in actual continuous production. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a sterilization device for diaper production. The device uses unfolding rollers in conjunction with full-area negative pressure adsorption to flatten the diapers in sections, eliminate blind spots for irradiation in the folds, and ensure that both sides are fully exposed to ultraviolet light for sterilization. The sterilization effect is far superior to that of traditional equipment.

[0006] The aforementioned disinfection device for diaper production includes a frame, with guide rollers rotatably connected to the upper right and lower left parts of the frame. A drive mechanism is provided on the outer wall of the frame. An unfolding roller is rotatably connected to the upper left and lower right parts of the frame. An extrusion disc is fixedly connected to the inner wall of the upper left and lower right parts of the frame. The unfolding roller includes a mounting tube, an expansion mechanism, an auxiliary mechanism, an adjustment mechanism, and a lifting assembly. A limit groove is fixedly opened on the outer wall of the mounting tube, and an opening is fixedly opened on the middle side wall of the mounting tube. A double-channel rotary joint is fixedly connected to one end of the mounting tube, and a sprocket is fixedly installed at the other end of the mounting tube. The auxiliary mechanism is fixedly installed in the middle of the mounting tube, and the expansion mechanism is installed on both sides of the auxiliary mechanism. Multiple sets of slots are opened along the circumferential direction on the auxiliary mechanism, and a sliding opening is fixedly opened at the bottom of each slot. The expansion mechanism includes an outer mounting plate, a mounting frame, an inner mounting plate, and an expansion slider.

[0007] Preferably, the auxiliary mechanism has outwardly expanding rings at both ends, a fixed screw hole is fixedly provided in the middle of the auxiliary mechanism, a positive pressure port is fixedly provided on the side wall of the slot away from the center, the positive pressure port extends through the auxiliary mechanism to the right, and a quick-connect pneumatic interface is threaded to the outside of the positive pressure port. A negative pressure port and a connecting port are fixedly provided on the side wall of the slot near the center, the negative pressure port extends through the auxiliary mechanism to the left, and a quick-connect pneumatic interface is also threaded to the outside of the negative pressure port. The connecting port extends through the auxiliary mechanism to both sides, and a quick-connect pneumatic interface is threaded to both ends of the connecting port.

[0008] Preferably, the lifting assembly includes a driven rod and an air nozzle. The bottom of the air nozzle is fixedly connected to the driven rod by bolts. The air nozzle is slidably connected to the slot. A groove ring is fixedly opened on the side wall of the air nozzle. Sealing rings are fixedly installed on the upper and lower parts of the groove ring. An air hole is also provided inside the air nozzle. The air hole is connected to the groove ring. The driven rod is slidably engaged with the sliding port. Guide grooves are fixedly opened at both ends of the driven rod.

[0009] Preferably, the mounting frame is sandwiched between the outer mounting plate and the inner mounting plate. A fixing screw hole is fixedly provided in the middle of the mounting frame. Multiple sets of sliding grooves are fixedly provided on the outer wall of the mounting frame. A slot is fixedly provided outside the sliding groove. Multiple sets of assembly holes are also provided on the side wall of the mounting frame. Multiple sets of limiting screw holes are fixedly provided on the outer mounting plate. Adjusting screw sleeves are threadedly connected to the limiting screw holes. Multiple sets of assembly holes are also fixedly provided on the outer mounting plate. Multiple sets of openings are fixedly provided on the inner mounting plate. An opening is fixedly provided at the end of the opening away from the center. Assembly holes are also fixedly provided on the inner mounting plate. Assembly holes one, two, and three are fixedly connected by mounting bolts. The expansion slider is slidably connected to the slot. The expansion slider has a hollow structure inside. The outer surface of the expansion slider is a suction hole. A quick-connect pneumatic interface is threadedly connected to the inner surface of the expansion slider. A connecting slider extends inward from the expansion slider.

[0010] Preferably, the outer end of the adjusting mechanism is threaded with a top ball, which slides with the extrusion plate. The adjusting mechanism is slidably connected to the connecting slider, which is slidably connected to the opening. An extrusion part is fixedly connected to the middle of the adjusting mechanism. The outer wall of the extrusion part slides with the inner wall of the adjusting screw sleeve. A large compression spring is fixedly provided on the inner side wall of the extrusion part. The other end of the large compression spring is engaged with the outer side wall of the connecting slider. A small compression spring is fixedly provided on the inner side wall of the connecting slider. The other end of the small compression spring is engaged with the outer wall of the inner mounting plate. A fork part is fixedly connected to the inner end of the adjusting mechanism. The fork part slides with the guide groove.

[0011] Preferably, the extrusion disc includes a high zone, a middle zone, and a low zone, with the high zone and the middle zone arranged opposite to each other.

[0012] Preferably, multiple sets of ultraviolet lamps are fixedly connected to the frame, and the drive mechanism includes a servo motor and a chain. The output shaft of the servo motor is circumferentially fixed to the sprocket of one of the unfolding rollers, and the chain is connected to both sets of sprockets.

[0013] Compared with the prior art, the beneficial effects of the present invention are: 1. By using unfolding rollers in conjunction with full-area negative pressure adsorption, the diaper is unfolded in sections and flattened, eliminating blind spots for irradiation in wrinkles, and both sides are fully exposed to ultraviolet disinfection, resulting in a sterilization effect far superior to traditional equipment; 2. By adjusting the screw sleeve to control the stretching stroke, the stretching performance of different areas of the diaper core, elastic band, and non-woven fabric is matched; the double compression spring sequential action realizes flattening before stretching and shrinking before separation, making the flexible operation less likely to damage the fabric, and can be adapted to the production of multiple specifications of diapers. 3. Relying on the pure mechanical timing control of the extrusion disc, the positive and negative air pressure are automatically switched, eliminating the need for complex electrical control components, resulting in a low failure rate and low maintenance costs; after completion, the lifting and blowing of air quickly prevents sticking and separation, and the synchronous servo constant speed transmission ensures a smooth high-speed production process, effectively preventing sticking to the rollers, scratches, and deviation. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the rear structure of the present invention; Figure 3 This is a schematic diagram of the frame structure; Figure 4 This is a schematic diagram of the overall structure of the unfolding roller; Figure 5 This is a schematic diagram of the internal structure of the unfolding roller; Figure 6 This is an exploded view of the unfolding roller structure. Figure 7 This is an exploded view of the expansion mechanism. Figure 8This is a structural diagram of the outer mounting plate and the inner mounting plate; Figure 9 This is a schematic diagram of the front structure of the auxiliary mechanism; Figure 10 This is a schematic diagram of the rear structure of the auxiliary mechanism; Figure 11 A schematic diagram showing the coordination between the adjustment mechanism and the lifting assembly; Figure 12 This is a schematic diagram of the extrusion disc structure; Figure 13 This is a schematic diagram of the structure when the air nozzle and the negative pressure port are in contact. Figure 14 This is a schematic diagram of the structure when the air nozzle and the positive pressure port are in contact.

[0015] In the diagram, 1. Frame; 101. Guide roller; 102. UV lamp assembly; 103. Extrusion disc; 103A. High zone; 103B. Middle zone; 103C. Low zone; 2. Mounting tube; 201. Double-channel rotary joint; 202. Sprocket; 203. Opening one; 204. Limiting groove; 3. Drive mechanism; 301. Servo motor; 302. Chain; 4. Expanding mechanism; 401. Outer mounting plate; 401A. Limiting screw hole; 401B. Assembly hole one; 402. Mounting frame; 402A. Slide groove; 402B. Slot; 402C. Assembly hole two; 402D. Fixing screw hole one; 403. Inner mounting plate; 403A. Opening; 40 3B. Opening Two; 403C. Assembly Hole Three; 404. Assembly Bolt; 405. Expanding Slider; 405A. Connecting Slider; 405B. Suction Hole; 5. Auxiliary Mechanism; 501. Outer Expanding Ring; 502. Slot Hole; 502A. Negative Pressure Port; 502B. Connecting Port; 502C. Positive Pressure Port; 503. Fixing Screw Hole Two; 504. Sliding Port; 6. Adjustment Mechanism; 601. Top Ball; 602. Extrusion Section; 603. Fork Section; 7. Lifting Assembly; 701. Driven Rod; 701A. Guide Groove; 702. Air Nozzle; 702A. Groove Ring; 702B. Air Hole; 8. Adjusting Screw Sleeve; 9. Large Compression Spring; 10. Small Compression Spring; 11. Quick-Connect Pneumatic Interface. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings: The directional terms used in the detailed description paragraphs are only for the convenience of those skilled in the art to understand the technical solutions described in this application based on the visual orientation shown in the accompanying drawings. Unless otherwise explicitly specified and limited, the terms "setting," "installing," "connecting," etc., should be interpreted broadly, and those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0017] like Figure 1 , Figure 2 and Figure 5 As shown, a disinfection device for diaper production includes a frame 1. Guide rollers 101 are rotatably connected to the upper right and lower left parts of the frame 1. Diapers that have not yet been cut and separated are continuously conveyed through this disinfection device. After passing through two sets of unfolding rollers, the diapers are stretched open to eliminate the obstruction of wrinkles, allowing the front and back of the diapers to be fully irradiated by ultraviolet light, thus achieving disinfection. This avoids the blind spots of ultraviolet light being blocked by wrinkles, eliminating defects such as inadequate local disinfection and uneven disinfection time. By setting the guide rollers 101, the diapers can be fully attached to the surface of the unfolding rollers, increasing the contact area between the two and ensuring the stability of the contact, thus avoiding the diaper production line being affected by previous or subsequent processes.

[0018] A drive mechanism 3 is installed on the outer wall of the frame 1. The drive mechanism 3 drives two sets of unfolding rollers to rotate at the same speed. The rotation speed is matched with the forward speed of the diaper production line. The circumference of one rotation of the unfolding roller is equal to the length of one set of diapers. This achieves zero relative sliding between the unfolding roller and the diaper, eliminating friction and scratching of the non-woven fabric on the surface of the diaper and the elastic band structure. In the later stages of the diaper production process, the core is already attached to the middle section, and the elastic band is installed in the front section, resulting in different stretch rates at different positions. Therefore, simply pulling the diaper with the same force and the same stroke will not only fail to complete the unfolding operation smoothly, but will also damage the diaper. Therefore, the unfolding roller is equipped with multiple sets of adjustment mechanisms 6 and adjustment screw sleeves 8, which can set different stretch strokes according to the material of different positions of the diaper to ensure that the diaper can unfold smoothly. The zoned differentiated stretching adapts to the composite structural mechanical properties of the diaper.

[0019] The upper left and lower right sides of the frame 1 are rotatably connected to unfolding rollers. Extrusion discs 103 are fixedly connected to the inner walls of the upper left and lower right sides of the frame 1. The extrusion discs 103 are located on the sides of the unfolding rollers and compress the adjusting mechanism 6 on the unfolding rollers, controlling and adjusting the expansion slider 405 and the air nozzle 702. Relying on mechanical pressure linkage to replace separate electrical control, it eliminates the need for multiple sets of independent electrically controlled cylinders and solenoid valves, simplifying the overall electrical control wiring structure, reducing the equipment's electrical control failure rate and production and maintenance costs, and simultaneously achieving precise linkage of the expansion, adsorption, and peeling actions.

[0020] like Figure 4 and Figure 6As shown, the unfolding roller includes a mounting tube 2, an expansion mechanism 4, an auxiliary mechanism 5, an adjustment mechanism 6, and a lifting assembly 7. The side walls at both ends of the mounting tube 2 are rotatably engaged with the frame 1 and support the auxiliary mechanism 5, the expansion mechanism 4, etc. By setting the expansion mechanism 4 and the adjusting screw sleeve 8, the outward sliding stroke of each set of expansion sliders 405 is limited. The core area in the middle of the diaper has a low elongation rate, and its stretching stroke needs to be short, so the adjusting screw sleeve 8 needs to be screwed into the expansion mechanism 4. The elastic band area in the front of the diaper has a high elongation rate, and its stretching stroke needs to be long, so the adjusting screw sleeve 8 needs to be screwed out of the expansion mechanism 4. The non-woven fabric material in the back of the diaper has a moderate elongation rate, so the adjusting screw sleeve 8 needs to be rotated to the middle position to limit the maximum stroke of the expansion slider 405.

[0021] The mechanically adjustable screw sleeve is steplessly adjustable, adaptable to mass production of various diaper models with different weights of non-woven fabrics, different core widths, and different elastic band specifications, making the equipment highly versatile. Because the diaper core is thicker and more rigid, the core in the middle is prone to lifting when the diaper is stretched laterally. By incorporating a lifting component 7, the core in the middle of the diaper is held in place to prevent it from lifting, ensuring the diaper's flatness during the sterilization process. Furthermore, after sterilization, residual adhesion between the unfolding roller and the diaper cannot be eliminated in time. To prevent the diaper and unfolding roller from sticking together during high-speed operation, which would affect their separation, the lifting component 7 extends outwards to lift the diaper off the unfolding roller and blows air in the opposite direction to facilitate smooth separation and prevent damage.

[0022] A limiting groove 204 is fixedly provided on the outer wall of the mounting tube 2. The limiting groove 204 cooperates with the fixing screw hole 402D and the fixing screw hole 503. When assembling the unfolding roller, the auxiliary mechanism 5 is first placed in the middle of the mounting tube 2. By screwing bolts into the fixing screw hole 503 and allowing the bottom of the bolts to penetrate into the limiting groove 204, the auxiliary mechanism 5 is circumferentially and axially fixed relative to the mounting tube 2. Then, the expansion mechanism 4 is installed from the mounting tube 2 onto both sides of the auxiliary mechanism 5, and bolts are screwed into the fixing screw hole 402D to achieve the limiting fixation of the expansion mechanism 4 on the mounting tube 2. The split modular assembly structure achieves dual limiting of axial anti-movement and circumferential anti-slip of the mechanism. It is convenient for disassembly, assembly and maintenance. In the later stage, the worn expansion slider 405 and air nozzle 702 parts can be replaced separately without disassembling the entire roller body, which greatly reduces the downtime for equipment maintenance and increases the effective production time of the production line.

[0023] An opening 203 is fixedly provided on the middle side wall of the mounting tube 2. The opening 203 allows the air supply tube to pass through the side wall of the mounting tube 2, connecting the dual-channel rotary joint 201 and the positive pressure port 502C and negative pressure port 502A. This, in conjunction with the air nozzle 702 and the expansion slider 405, achieves the effect of adsorbing and blowing away the diaper. The built-in pipeline layout avoids the problem of the external air tube being scratched, tangled, or damaged by the diaper, optimizes the flatness of the external working surface of the roller, and ensures a smooth and scratch-free diaper transport throughout the entire process. One end of the mounting tube 2 is fixedly connected to a dual-channel rotary joint 201. One channel is connected to an external positive pressure blowing device, and the other channel is connected to an external negative pressure suction device. A sprocket 202 is fixedly installed at the other end of the mounting tube 2. An auxiliary mechanism 5 is fixedly installed in the middle of the mounting tube 2. An expansion mechanism 4 is installed on both sides of the auxiliary mechanism 5. Multiple sets of slots 502 are opened along the circumferential direction on the auxiliary mechanism 5. A sliding opening 504 is fixedly opened at the bottom of each slot 502. The expansion mechanism 4 includes an outer mounting plate 401, a mounting frame 402, an inner mounting plate 403, and an expansion slider 405.

[0024] like Figure 9 and Figure 10 As shown, the auxiliary mechanism 5 has an outer expansion ring 501 extending outward at both ends. When the expansion mechanism 4 is axially installed at both ends of the auxiliary mechanism 5, the outer expansion ring 501 allows for a certain space between the auxiliary mechanism 5 and the expansion mechanism 4, which facilitates the placement of equipment such as gas pipelines.

[0025] A fixing screw hole 503 is fixedly provided in the middle of the auxiliary mechanism 5. A positive pressure port 502C is fixedly provided on the side wall of the slot 502 away from the center. The positive pressure port 502C extends through the auxiliary mechanism 5 to the right. The external thread of the positive pressure port 502C is connected to a quick-connect pneumatic interface 11. When the air nozzle 702 extends outward, the groove ring 702A slides upward in the slot 502 to the position of the positive pressure port 502C. Gas enters the air hole 702B from the groove ring 702A and blows outward to promote the smooth separation of the diaper from the unfolding roller. Similarly, when the air nozzle 702 extends outward, the groove ring 702A slides upward in the slot 502 to the position of the positive pressure port 502C. As the lifting mechanism retracts inward, the groove ring 702A slides downward in the groove hole 502 to the position of the negative pressure port 502A. The air hole 702B is connected to the negative pressure port 502A, continuously generating negative pressure to absorb the diaper. At the same time, the connecting port 502B is at the same height as the negative pressure port 502A. Under the action of the groove ring 702A, the negative pressure port 502A and the connecting port 502B remain connected. Therefore, the negative pressure will also absorb the expanding slider 405 through the connecting port 502B, and the air suction hole 405B absorbs the diaper.

[0026] The system automatically switches between positive and negative air paths based on the displacement of the nozzle 702, eliminating the need for a separate solenoid valve for time-sharing air control. The air path linkage response speed matches the roller rotation rhythm, ensuring synchronized adsorption, expansion, and peeling actions, and high consistency in air pressure linkage. A negative pressure port 502A and a connecting port 502B are fixedly provided on the side wall near the center of the slot 502. The negative pressure port 502A extends to the left through an auxiliary mechanism 5, and a quick-connect pneumatic interface 11 is threaded onto its exterior. The connecting port 502B extends to both sides through the auxiliary mechanisms 5, and both ends of the connecting port 502B are threaded onto quick-connect pneumatic interfaces 11. The quick-connect pneumatic interfaces 11 are existing technology and can be purchased directly; their function is to connect the air supply pipe to each air port.

[0027] like Figure 13 and Figure 14 As shown, the lifting assembly 7 includes a driven rod 701 and an air nozzle 702. The bottom of the air nozzle 702 is fixedly connected to the driven rod 701 by bolts. The air nozzle 702 is slidably connected to the slot 502, so the lifting assembly 7 can slide back and forth in the slot 502. A groove ring 702A is fixedly provided on the side wall of the air nozzle 702. Sealing rings are fixedly installed on the upper and lower parts of the groove ring 702A to prevent gas leakage from the connection gap between the slot 502 and the air nozzle 702. An air hole 702B is also provided inside the air nozzle 702. The air hole 702B is connected to the groove ring 702A. The driven rod 701 is slidably engaged with the slide 504. Guide grooves 701A are fixedly provided at both ends of the driven rod 701. The shape of the guide grooves 701A is as follows: Figure 11 As shown, it is divided into three sections: the middle section is horizontal, the outer section is angled upward, and the inner section is angled downward. It is slidably engaged with the fork part 603 of the adjusting mechanism 6. When the adjusting mechanism 6 is extended outward, the lifting mechanism retracts the slot 502, and the air nozzle 702 retracts inward, cooperating with the negative pressure port 502A to generate an adsorption force and prevent the diaper core from curling up. When the adjusting mechanism 6 is retracted inward, the lifting mechanism extends outward from the slot 502, and the air nozzle 702 extends outward, cooperating with the positive pressure port 502C to generate a blowing force and promote the separation of the diaper from the unfolding roller.

[0028] like Figure 7 and Figure 8As shown, the mounting frame 402 is sandwiched between the outer mounting plate 401 and the inner mounting plate 403. A fixing screw hole 402D is fixedly provided in the middle of the mounting frame 402. Multiple sets of sliding grooves 402A are fixedly provided on the outer wall of the mounting frame 402. A slot 402B is fixedly provided on the outside of the sliding groove 402A. The slot 402B is slidably connected to the expansion slider 405. The connecting slider 405A extends inward into the sliding groove 402A. Multiple sets of assembly holes 402C are also provided on the side wall of the mounting frame 402. Multiple sets of limiting screw holes 401A are fixedly provided on the outer mounting plate 401. The limiting screw holes 401A are threaded... The outer mounting plate 401 is fixedly provided with multiple sets of assembly holes 401B connected to the adjusting screw sleeve 8, and multiple sets of openings 403A are fixedly provided on the inner mounting plate 403. The openings 403A allow the adjusting mechanism 6 to pass through the inner mounting plate 403 and provide radial limit for the adjusting mechanism 6. An opening 403B is fixedly provided at the end of the opening 403A away from the center. The openings allow the air supply pipe to connect the quick-connect pneumatic interface 11 on the expansion slider 405 and the quick-connect pneumatic interface 11 on the connecting port 502B, thus avoiding structural interference between the air supply pipe and the inner mounting plate 403.

[0029] The inner mounting plate 403 is also fixedly provided with a third assembly hole 403C. The first assembly hole 401B, the second assembly hole 402C and the third assembly hole 403C are fixedly connected by the assembly bolt 404, thereby completing the assembly of the expansion mechanism 4. The expansion slider 405 is slidably connected to the slot 402B. The expansion slider 405 has a hollow structure inside. The outer surface of the expansion slider 405 is a suction hole 405B. The inner surface of the expansion slider 405 is threadedly connected to the quick-connect pneumatic interface 11. The expansion slider 405 extends inward to the connecting slider 405A. The connecting slider 405A cooperates with the adjusting screw sleeve 8. The position of the adjusting screw sleeve 8 limits the farthest sliding distance of the connecting slider 405A, thereby limiting the sliding stroke of the expansion slider 405. The 405B fully distributed suction holes can fit the side of the diaper for negative pressure fixation, and together with the 702 central air nozzle, it can achieve full-area multi-point fixation of the diaper, further improving the overall flatness, and eliminating dead corners when exposed to ultraviolet light.

[0030] like Figure 11 As shown, the outer end of the adjusting mechanism 6 is threaded with a top ball 601, which slides with the extrusion plate 103. The adjusting mechanism 6 is slidably connected to the connecting slider 405A, which is slidably connected to the opening 403A. The middle part of the adjusting mechanism 6 is fixedly connected to the extrusion part 602, which slides with the inner wall of the adjusting sleeve 8. A large compression spring 9 is fixedly provided on the inner side wall of the extrusion part 602. The other end of the large compression spring 9 is engaged with the outer side wall of the connecting slider 405A. The large compression spring 9 and the adjusting sleeve 8 do not come into contact and are not connected. The large compression spring 9 can push the adjusting mechanism 6 to continue moving outward without being restricted by the stroke of the adjusting sleeve 8, thereby driving the lifting mechanism to retract inward.

[0031] A small compression spring 10 is fixed on the inner side wall of the connecting slider 405A. The elastic coefficient of the small compression spring 10 is smaller than that of the large compression spring 9. Therefore, when the adjusting mechanism 6 extends outward, the large compression spring 9 first drives the lifting mechanism to adsorb the core of the diaper in the middle area to avoid knocking it up later. Then, the small compression spring 10 drives the expansion slider 405 to extend and fully unfold the diaper. When the adjusting mechanism 6 is squeezed inward by the squeezing plate 103, the small compression spring 10 first drives the expansion slider 405 to reset, release the pull on the diaper, and make the diaper slowly return to its original area. Then, the large compression spring 9 drives the lifting mechanism to extend, lift the diaper, and blow air outward through the air hole 702B to ensure smooth separation of the diaper from the unfolding roller.

[0032] The dual-elasticity springs are linked in a sequential, graded manner, forming a flexible operational logic of first flattening, then expanding, first shrinking, and finally peeling. This prevents the diaper fabric from rebounding and wrinkling, and the core from shifting, which can be caused by rigid pulling or instantaneous force release. The entire process provides flexible protection for the structural integrity of the finished diaper. The other end of the small spring 10 is engaged with the outer wall of the inner mounting plate 403. The inner end of the adjusting mechanism 6 is fixedly connected to the fork section 603, which slides in engagement with the guide groove 701A.

[0033] like Figure 3 and Figure 12 As shown, the squeezing disc 103 includes a high zone 103A, a middle zone 103B, and a low zone 103C, with the high zone 103A and the middle zone 103B arranged opposite each other. When the high zone 103A engages with the top ball 601, it squeezes the adjusting mechanism 6, causing the adjusting mechanism 6 to retract inwards. At this stage, the diaper is about to separate from the unfolding roller. When the low zone 103C engages with the top ball 601, the adjusting mechanism 6 extends outwards under the push of the large compression spring 9 and the small compression spring 10. At this stage, the diaper is absorbed and unfolded, ensuring sufficient contact between the diaper and the ultraviolet light, thus improving the disinfection effect. The adjusting mechanism 6 moves from the middle zone 103B to the low zone 103C to complete the absorption and unfolding of the diaper; then it moves from the low zone 103C to the high zone 103A to complete the separation of the diaper; finally, it moves from the high zone 103A to the middle zone 103B to prepare for the next absorption and unfolding operation. The 103 three-zone integrated extrusion disc automatically cycles through different work processes as the rollers rotate, eliminating the need for additional drive cylinders or cams for reversing. This results in lower overall energy consumption, and the process cycle time is fully synchronized with production line transmission. It is suitable for continuous rotary disinfection operations, maximizing the effective disinfection time of ultraviolet lamps. Multiple sets of ultraviolet lamps 102 are fixedly connected to the frame 1. The drive mechanism 3 includes a servo motor 301 and a chain 302. The output shaft of the servo motor 301 is circumferentially fixed to the sprocket 202 of one of the unfolding rollers. The chain 302 is connected to both sets of sprockets 202. The servo + chain 302 dual-drive system has a precise transmission ratio and strong load-bearing capacity, making it suitable for long-term continuous industrial production. The synchronization error of the two sets of unfolding rollers is extremely small, and the force on both sides of the expansion is symmetrical, avoiding one-sided offset and twisting of the diaper. Combined with the full-area ultraviolet lamps and the aforementioned leveling and unfolding structure, the system ultimately achieves full-area, dead-angle-free, and standardized ultraviolet sterilization of the diaper.

[0034] Working principle: I. Overall Power and Conveying Coordination Principle Servo motor 301 synchronously drives the two unfolding rollers to rotate coaxially and at the same speed via chain 302. The circumference of the unfolding roller surface is equal to the length of a single diaper. The linear speed of the roller body is precisely matched with the conveying speed of the diaper production line, achieving zero relative slippage between the roller body and the diaper. One end of the unfolding roller is equipped with a dual-channel rotary joint 201, which is connected to a negative pressure suction device and a positive pressure blowing device respectively. During the rotation of the roller body, positive and negative air pressures are continuously and stably supplied, and the air path switching is completed in conjunction with the internal air path structure.

[0035] II. Mechanical timing drive principle The extrusion disc 103, fixed to the side of the frame 1, is equipped with three annular zones: high, medium, and low. When the unfolding roller rotates, the top ball 601 at the outer end of the adjusting mechanism 6 can roll against the surface of the extrusion disc 103. Relying on the change in the height of the disc, the mechanically driven adjusting mechanism 6 performs telescopic movement, automatically completing the process sequence cycle. 1. The ball is headed through the middle position 103B: This is the standby preparation position. The adjustment mechanism 6 is in the middle position, storing energy for the next stage of the extension action. 2. The top ball 601 slides to the low zone 103C: the plate surface is not restricted by compression. Under the elastic force of the large compression spring 9 and the small compression spring 10, the adjustment mechanism 6 extends outward as a whole and enters the adsorption and expansion disinfection station. 3. The top ball 601 slides to the high position 103A: the disc surface squeezes the top ball 601 inward, forcing the adjustment mechanism 6 to contract inward and enter the shrinking and stripping station.

[0036] III. Principles of Zoned Negative Pressure Leveling and Differentiated Width Expansion 1. Prioritize leveling and preventing warping of the central core. When the adjustment mechanism 6 extends outward, the large compression spring 9 with a larger elastic coefficient takes priority, pulling the lifting component 7 to retract inward. The air nozzle 702 slides to the negative pressure port 502A of the slot 502, and the air passage is connected to the negative pressure. The air nozzle 702 generates suction, which firmly adsorbs the thick and rigid core area in the middle of the diaper, pulling the core from the inside, completely preventing the core from arching or curling up when stretched laterally, and ensuring the flatness of the middle part.

[0037] 2. Flexible expansion of side partitions After the large compression spring 9 completes the core adsorption, the smaller compression spring 10, with less elasticity, then pushes the connecting slider 405A and the expansion slider 405 to slide outwards. The adjusting screw sleeve 8 on the outer mounting plate 401 is pre-set according to the material of each area of ​​the diaper: the screw sleeve in the core area is screwed in to limit the short-stroke stretching of the slider; the screw sleeve in the front elastic band area is screwed out to allow for a long stretching stroke; the screw sleeve in the rear non-woven fabric area is adjusted to the middle position to match a moderate stretching amount. The air suction hole 405B on the surface of the expansion slider 405 simultaneously connects to the negative pressure, tightening and fixing the two sides of the diaper, completing the differentiated lateral expansion of the zones, thoroughly smoothing out wrinkles and folds, and making the diaper taut and flat overall.

[0038] IV. Principle of All-round Ultraviolet Disinfection The diaper is secured by a central air nozzle 702 and two side expansion sliders 405, ensuring full negative pressure and multi-point fixation. This results in a completely flat and taut surface, eliminating blind spots such as wrinkles, shadows, overlapping areas, and localized bulges. The UV lamps 102 surrounding the frame 1 simultaneously irradiate both the front and back of the diaper with UV light. The fabric surface, side elastic bands, and core layer gaps all receive a uniform and stable UV dose, achieving comprehensive and even sterilization. This overcomes the shortcomings of traditional single-sided, fixed-point disinfection methods, which result in uneven sterilization and dead zones.

[0039] V. Sequential tapering + pneumatic anti-sticking and peeling principle After the disinfection process is completed, the roller body drives the top ball 601 to rotate to the high position 103A, and the extrusion adjustment mechanism 6 of the extrusion disc 103 retracts inward: 1. First, reduce the width and release the pressure: The small compression spring 10 is compressed and reset first, which drives the expansion slider 405 to retract inward, simultaneously disconnecting the side negative pressure, slowly releasing the lateral stretching force of the diaper, and the fabric rebounds smoothly, avoiding instantaneous pressure release that could cause fabric wrinkles or core displacement. 2. Rear Lifting and Air Separation: Subsequently, the large compression spring 9 drives the lifting assembly 7 to push outwards, and the air nozzle 702 slides to switch to the positive pressure port 502C, through which high-pressure gas is introduced and blown outwards. On the one hand, the driven rod 701 pushes the entire diaper away from the roller surface, and on the other hand, the positive airflow quickly disperses the residual negative pressure suction between the air nozzle 702 and the fabric. This dual action prevents the diaper from adhering to the rollers during high-speed operation, smoothly completing the separation of the diaper from the unfolding roller, and the finished diaper smoothly enters the next production process.

[0040] VI. Cyclic Reset The top ball 601 rotates from the high zone 103A to the middle zone 103B, and all mechanisms return to the initial standby state. The entire process of adsorption, expansion, disinfection, and peeling completes one cycle, continuously carrying out uninterrupted cyclic disinfection of the diapers being continuously conveyed on the production line.

[0041] This invention uses a spreading roller combined with full-area negative pressure adsorption to completely flatten the diaper, eliminating blind spots in the irradiation of wrinkles, and ensuring that both sides are fully exposed to ultraviolet disinfection, resulting in a sterilization effect far superior to traditional equipment. The stretching stroke is controlled by adjusting the 8 zones of the screw sleeve to match the stretching performance of different areas of the diaper core, elastic band, and non-woven fabric. The dual-spring sequential action achieves flattening before stretching and shrinking before separation, ensuring flexible operation and minimizing fabric damage, and is suitable for producing various diaper specifications. Relying on the purely mechanical sequential control action of the 103 extrusion disc, it automatically switches between positive and negative air pressure, eliminating complex electrical control components, resulting in a low failure rate and low maintenance costs. After completion, a lifting and blowing action quickly prevents sticking and separation, with synchronous servo constant speed transmission, ensuring a smooth high-speed production process and effectively preventing sticking to rollers, scratches, and deviation.

Claims

1. A sterilization device for diaper production, comprising a frame, guide rollers rotatably connected to the upper right and lower left parts of the frame, and a drive mechanism provided on the outer wall of the frame, characterized in that: The upper left and lower right parts of the frame are rotatably connected to unfolding rollers. The inner walls of the upper left and lower right parts of the frame are fixedly connected to extrusion discs. The unfolding rollers include a mounting tube, an expansion mechanism, an auxiliary mechanism, an adjustment mechanism, and a lifting assembly. A limit groove is fixedly opened on the outer wall of the mounting tube. An opening is fixedly opened on the middle side wall of the mounting tube. A double-channel rotary joint is fixedly connected to one end of the mounting tube. A sprocket is fixedly installed at the other end of the mounting tube. The auxiliary mechanism is fixedly installed in the middle of the mounting tube. The expansion mechanism is installed on both sides of the auxiliary mechanism. Multiple sets of slots are opened along the circumferential direction on the auxiliary mechanism. A sliding opening is fixedly opened at the bottom of each slot. The expansion mechanism includes an outer mounting plate, a mounting frame, an inner mounting plate, and an expansion slider.

2. The sterilization device for diaper production according to claim 1, characterized in that: The auxiliary mechanism has outward-expanding rings extending from both ends. A fixed screw hole is fixedly provided in the middle of the auxiliary mechanism. A positive pressure port is fixedly provided on the side wall of the slot away from the center. The positive pressure port extends through the auxiliary mechanism to the right. A quick-connect pneumatic interface is threaded to the outside of the positive pressure port. A negative pressure port and a connecting port are fixedly provided on the side wall of the slot near the center. The negative pressure port extends through the auxiliary mechanism to the left. A quick-connect pneumatic interface is also threaded to the outside of the negative pressure port. The connecting port extends through the auxiliary mechanism to both sides. Both ends of the connecting port are threaded to quick-connect pneumatic interfaces.

3. The sterilization device for diaper production according to claim 1, characterized in that: The lifting assembly includes a driven rod and an air nozzle. The bottom of the air nozzle is fixedly connected to the driven rod by bolts. The air nozzle is slidably connected to the slot. A groove ring is fixedly opened on the side wall of the air nozzle. Sealing rings are fixedly installed on the upper and lower parts of the groove ring. An air hole is also provided inside the air nozzle. The air hole is connected to the groove ring. The driven rod is slidably engaged with the sliding port. Guide grooves are fixedly opened at both ends of the driven rod.

4. The sterilization device for diaper production according to claim 1, characterized in that: The mounting frame is sandwiched between the outer mounting plate and the inner mounting plate. A fixing screw hole is fixedly provided in the middle of the mounting frame. Multiple sets of sliding grooves are fixedly provided on the outer wall of the mounting frame. A slot is fixedly provided on the outside of the sliding groove. Multiple sets of assembly holes are also provided on the side wall of the mounting frame. Multiple sets of limiting screw holes are fixedly provided on the outer mounting plate. Adjusting screw sleeves are threadedly connected to the limiting screw holes. Multiple sets of assembly holes are also fixedly provided on the outer mounting plate. Multiple sets of openings are fixedly provided on the inner mounting plate. An opening is fixedly provided at the end of the opening away from the center. Assembly holes are also fixedly provided on the inner mounting plate. Assembly holes one, two, and three are fixedly connected by mounting bolts. The expansion slider is slidably connected to the slot. The expansion slider has a hollow structure inside. The outer surface of the expansion slider is a suction hole. A quick-connect pneumatic interface is threadedly connected to the inner surface of the expansion slider. A connecting slider extends inward from the expansion slider.

5. A sterilization device for diaper production according to claim 1, characterized in that: The adjusting mechanism is threadedly connected to a top ball at its outer end, which slides in cooperation with the extrusion plate. The adjusting mechanism is slidably connected to the connecting slider, which is slidably connected to the opening. An extrusion part is fixedly connected to the middle of the adjusting mechanism. The outer wall of the extrusion part slides in cooperation with the inner wall of the adjusting screw sleeve. A large compression spring is fixedly installed on the inner side wall of the extrusion part. The other end of the large compression spring cooperates with the outer side wall of the connecting slider. A small compression spring is fixedly installed on the inner side wall of the connecting slider. The other end of the small compression spring cooperates with the outer wall of the inner mounting plate. A fork part is fixedly connected to the inner end of the adjusting mechanism. The fork part slides in cooperation with the guide groove.

6. The sterilization device for diaper production according to claim 1, characterized in that: The extrusion plate includes a high zone, a middle zone, and a low zone, with the high zone and the middle zone arranged opposite to each other.

7. A sterilization device for diaper production according to claim 1, characterized in that: Multiple sets of ultraviolet lamps are fixedly connected to the frame. The drive mechanism includes a servo motor and a chain. The output shaft of the servo motor is circumferentially fixed to the sprocket of one of the unfolding rollers. The chain is connected to both sets of sprockets.

Images