Turntable spraying device for moisturizing non-woven fabric

Abstract

The invention discloses a rotating disc spraying device for moisturizing non-woven fabric. The rotating disc spraying device comprises a feeding unit, a spraying unit, a recycling unit, a control system and two independent liquid supply units. The spraying unit is provided with an up-down staggered turntable group corresponding to two sides of the non-woven fabric The double liquid supply units can be used for containing different liquids or concentrations and can be shared when the liquids are the same on both sides. The recycling units are provided with recycling grooves corresponding in height, and cross contamination is avoided through classified recycling. The PLC control module is in linkage with all the components, and flexible switching of single-face spraying and double-face spraying with the same liquid, the different liquid and the different concentrations is achieved. The device solves the problems that an existing device is single in function, uneven in spraying, serious in waste and the like, the device is matched with the cotton soft towel spunlace non-woven fabric, the moisturizing uniformity and the production efficiency are improved, and the cost is reduced.

Description

A rotating spray device for moisturizing nonwoven fabrics Technical Field

[0001] This invention relates to the field of nonwoven fabric processing equipment technology, and in particular to a rotary spray device for moisturizing nonwoven fabrics. Background Technology

[0002] In the processing of sheet-like flexible materials such as cotton wipes and moisturizing sheets, the softness, skin-friendliness, and multifunctionality of the products have become core elements of market competition. Among them, cotton wipes, as a frequently used cleaning and care product, are mainly made of spunlace nonwoven fabric. However, the types of spunlace nonwoven fabric raw materials for cotton wipes are currently somewhat limited, and traditional processing techniques focus more on physical structure optimization, lacking targeted moisturizing function design. This results in the product being prone to dryness due to rapid moisture loss during use, making it particularly unsuitable for infants, children, and people with sensitive skin who have high requirements for skin-friendliness.

[0003] To meet market demand for moisturizing cotton wipes, the industry has begun to explore adding moisturizing treatment steps to the processing, leading to the development of related spray moisturizing equipment. Chinese patent CN206701531U discloses a moisturizing paper spraying device. This device uses vertical paper rollers to straighten the paper and, combined with a spray disc, utilizes centrifugal force to spray a moisturizing agent, thus solving to some extent the problems of uneven spraying and nozzle clogging associated with traditional pressure spraying. However, this patent and existing similar equipment still have significant shortcomings in adapting to the moisturizing processing and functional expansion of spunlace nonwoven cotton wipes: 1. Existing equipment is mainly designed for moisturizing paper and does not fully consider the fiber looseness and absorbency characteristics of spunlace nonwoven cotton wipes. Furthermore, it can only achieve single moisturizing agent spraying, failing to meet the diverse needs of cotton wipe raw material modification and making it difficult to enhance product competitiveness through the combination of raw materials and functions. Simultaneously, in existing cotton wipe processing techniques, the moisturizing function largely relies on the modification of a single raw material or a single subsequent processing step, resulting in cumbersome processes and limited effectiveness. 2. Existing equipment generally suffers from the structural limitation that "one liquid tank can only hold one type of liquid." To achieve precise control of different functional liquids such as moisturizing and soothing liquids on the front and back of cotton towels, or different concentrations of the same liquid, multiple sets of equipment or additional processes are required. This significantly increases production time and equipment investment, and easily leads to raw material waste, making it difficult to adapt to flexible production needs. 3. Existing equipment often has the spraying and recycling mechanisms at the same height. During double-sided spraying, cross-contamination of the sprayed liquids between layers is likely, and the recycled liquid cannot be accurately reused due to mixing. Furthermore, the lack of dedicated recycling designs for different spraying modes means that unabsorbed moisturizing liquid drips directly, reducing raw material utilization and potentially polluting the production environment. In addition, CN206701531U does not include integrated multi-mode control functions, making it unable to flexibly switch between single-sided spraying, double-sided same-liquid spraying, and double-sided different liquid / different concentration spraying conditions, resulting in poor adaptability. 4. In the traditional moisturizing process of soft towels, if it is necessary to achieve different functions or different concentrations on both sides, multiple single-sided sprayings are required, which is a lengthy process and can easily lead to inconsistent spraying effects. However, existing equipment lacks a corresponding integrated solution, making it difficult to implement process modification and technological innovation, and it is impossible to simplify the process and save costs through equipment optimization.

[0004] In summary, given the current situation of cotton soft towel spunlace nonwoven fabric having a single raw material and lacking moisturizing function, as well as the shortcomings of existing spraying equipment in terms of liquid supply mode, structural layout, and process adaptability, there is an urgent need to develop a rotary spraying device with multi-mode spraying function, reasonable structural layout, and adaptability to the processing needs of cotton soft towels. Through process modification and technological innovation, the combination of moisturizing function and raw material improvement can be achieved to meet diversified production needs. Summary of the Invention

[0005] The purpose of this invention is to overcome the problems of limited functionality, restricted spraying modes, low resource utilization, and insufficient production efficiency in existing cotton towel spunlace nonwoven fabric moisturizing equipment. This invention provides a rotary spraying device for moisturizing nonwoven fabrics. Through a dual independent liquid supply unit and a staggered layout design, it enables flexible switching between multiple modes, including single-sided spraying, double-sided same-liquid spraying, double-sided different-liquid spraying, and front and back different-concentration spraying. This improves the uniformity and functional diversity of cotton towel moisturizing, while simplifying the process and reducing production costs.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0007] This invention provides a rotary spraying device for moisturizing nonwoven fabrics, comprising a feeding unit, a spraying unit, and a recovery unit arranged along the conveying direction of the spunlace nonwoven fabric, as well as a control system and two independent liquid supply units. The spraying unit is integrated inside the mounting bracket of the feeding unit, and the recovery unit is correspondingly located below the spraying unit to achieve classified recovery of moisturizing liquid under different spraying modes. The feeding unit includes a mounting bracket and rollers and a variable frequency speed-regulating motor mounted thereon. The variable frequency speed-regulating motor is connected to the rollers via a belt and can adaptively adjust according to the spraying mode. The system improves transmission speed. The spraying unit includes a turntable mounting frame and two sets of turntables staggered vertically, corresponding to the upper and lower surfaces of the non-woven fabric. Each turntable set includes a drive motor, a synchronous transmission assembly, a turntable assembly, and a nozzle. The drive motor is connected to the turntable assembly via the synchronous transmission assembly, and the nozzle is mounted on the turntable assembly to achieve synchronous or independent spraying of the upper and lower surfaces. The recycling unit includes two recycling tanks corresponding to the two turntable sets, allowing for the separate recycling of excess moisturizing liquid sprayed from different turntable sets. The control system includes an electrical cabinet, a touch screen, and a PLC control module. The PLC control module is electrically connected to the variable frequency speed control motor, the drive motor, and the liquid supply unit, enabling automated switching of multiple modes and precise parameter control. The two independent liquid supply units are connected to the two turntable sets one-to-one via independent pipelines. They can share a single liquid supply unit only when spraying the same liquid on both sides. Different liquids cannot be mixed in one tank to ensure purity and effectiveness during spraying.

[0008] Furthermore, the roller assembly of the feeding unit includes a top drive roller, a top side driven roller, a middle driven roller assembly, and a bottom driven roller. The middle driven roller assembly is composed of two driven rollers of the same specifications assembled in parallel at intervals. The line connecting the axes of the two driven rollers is parallel to the horizontal direction and is staggered with the axes of the top drive roller and the bottom driven roller. The nonwoven fabric passes sequentially around the top side driven roller, the top drive roller, the two driven rollers of the middle driven roller assembly, and the bottom driven roller. The staggered roller assembly extends the transmission path and spraying dwell time of the nonwoven fabric, improving the penetration effect of the moisturizing liquid. The variable frequency speed control motor is fixedly mounted on the motor mounting base at the bottom of the mounting bracket by bolts. Both its output shaft and the end of the top drive roller are equipped with transmission pulleys. The transmission belt is tensioned and sleeved between the two pulleys to ensure the stability and adjustability of the transmission speed.

[0009] Furthermore, the two sets of turntables are a low-position turntable set and a high-position turntable set. The low-position turntable set is arranged corresponding to the lower surface of the non-woven fabric, and the high-position turntable set is arranged corresponding to the upper surface of the non-woven fabric. The two sets of turntables are staggered in the vertical direction to avoid cross-contamination of the upper and lower layers of liquid during spraying. The synchronous transmission assembly consists of multiple synchronous pulleys arranged in series and a ring transmission belt. The number of synchronous pulleys corresponds one-to-one with the number of turntable assemblies. Each synchronous pulley is fixed to the transmission shaft by a key connection. The transmission shaft is mounted on the turntable mounting frame by a bearing seat. The top of the turntable assembly is fixed to the rotating part by a threaded connection. The top of the rotating part is coaxially and keyed to the synchronous pulley. The bottom of the rotating part is threaded to the top of the turntable assembly to ensure the coaxiality and stability of the transmission. The spray nozzles are evenly distributed around the circumference of the turntable assembly. The spray direction of the spray nozzles is towards the non-woven fabric transmission surface, and the spray angle of the spray nozzles can be finely adjusted according to the thickness of the non-woven fabric to improve the uniformity of spraying.

[0010] Furthermore, the two recycling tanks of the recycling unit are a low-level recycling tank and a high-level recycling tank. The low-level recycling tank is located directly below the low-level turntable assembly, and the high-level recycling tank is located directly below the high-level turntable assembly. The two are arranged vertically at intervals to avoid mixing of the moisturizing liquid collected from the top and bottom. Both recycling tanks are integrated inclined tank structures, with the inclined direction of the tank facing the liquid converging end, which facilitates the rapid convergence and recycling of the moisturizing liquid. The opening size of the recycling tank is larger than the spraying width of the corresponding turntable assembly, ensuring that all excess moisturizing liquid falls into the recycling tank. The edge of the tank opening is folded upward to form an anti-overflow edge to prevent the moisturizing liquid from overflowing. A detachable mesh protective structure is installed on the inner side of the tank opening to intercept impurities such as non-woven fabric debris generated during the spraying process, preventing impurities from clogging the pipeline and ensuring the purity of the recycled liquid.

[0011] Furthermore, the liquid supply unit includes a sealed liquid storage tank, a metering liquid supply pump, a three-way solenoid valve, a frequency conversion stirring device, a liquid level monitoring sensor, and a liquid supply pipeline. The liquid storage tank is a sealed box made of stainless steel, with a feeding port and a vent valve on the top. The feeding port is fitted with a sealing cap to ensure the airtightness of the liquid storage environment and prevent contamination of the moisturizing liquid. A frequency conversion stirring device is installed on the bottom surface inside the liquid storage tank. The frequency conversion stirring device is electrically connected to a PLC control module and can adjust the stirring speed according to the liquid level in the liquid storage tank to ensure uniform concentration of the moisturizing liquid. The stirring shaft of the stirring device is set along the length of the liquid storage tank. Multiple stirring blades are fixed on the shaft to improve the stirring effect; a liquid level monitoring sensor is installed on the inner wall of the storage tank, and the detection end of the liquid level monitoring sensor extends to the lower area of ​​the storage tank to monitor the liquid level in real time. When the liquid level is lower than the set threshold, an alarm is triggered in time; the inlet end of the metering supply pump is connected to the outlet of the storage tank through a pipeline, and the outlet end is connected to the inlet end of the three-way solenoid valve through a pipeline. The two outlet ends of the three-way solenoid valve are respectively connected to the nozzles of the corresponding turntable group through pipelines; the liquid level monitoring sensor is electrically connected to the PLC control module to realize the automated monitoring and control of the liquid level.

[0012] Furthermore, the metering pump is a variable frequency adjustable metering pump, which integrates a flow regulation module on its pump body. The flow regulation module is electrically connected to the PLC control module and can accurately adjust the supply flow according to the spraying mode and non-woven fabric parameters. A pressure monitoring device is connected in series in the outlet pipeline of the metering pump. The signal output terminal of the pressure monitoring device is electrically connected to the PLC control module to monitor the pipeline pressure in real time, avoid abnormal pressure from affecting the spraying effect, and automatically stop the machine and alarm when the pressure exceeds the set range.

[0013] Furthermore, the integrated electrical cabinet of the control system has partitioned installation areas for installing PLC control modules, power modules, relay groups, and terminal blocks, with a reasonable layout for easy maintenance. The cabinet door is equipped with a cooling fan and an observation window. The cooling fan ensures proper heat dissipation for the internal equipment, and the observation window allows for real-time monitoring of the equipment's operating status. The human-machine interface touchscreen is an industrial-grade touch display screen, connected to the PLC control module's communication interface via a communication cable. It is easy to operate, allowing for real-time setting and adjustment of operating parameters, and supports one-button switching between multiple modes. The control system also includes an external audible and visual alarm device, mounted on a bracket in a prominent position on the equipment. Its signal input is electrically connected to the output of the PLC control module, promptly issuing audible and visual alarm signals when problems such as low liquid level, abnormal pressure, or motor failure occur. The integrated electrical cabinet and touchscreen can be installed separately, and the installation layout can be improved by extending the communication line connection.

[0014] Furthermore, the liquid supply unit is compatible with various functional liquids such as water-based moisturizing liquid, soothing liquid, and nourishing liquid. The liquid supply pipeline uses food-grade hoses, which meet the hygiene requirements for cotton towel processing. The liquid supply pipelines of each turntable component in the same turntable group are of the same length, and the models and specifications of each nozzle are the same, ensuring that the spraying amount of each area on the same surface is uniform and consistent, and avoiding local moisturizing imbalance.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The present invention is specially designed for spunlace nonwoven fabric for cotton soft towels. By adding a moisturizing function processing step, it effectively makes up for the defects of the single function of traditional cotton soft towel raw materials, significantly improves the softness and skin-friendliness of the product, and broadens the application range of cotton soft towels in scenarios such as infant care and sensitive skin cleaning. Meanwhile, the equipment is adapted to the fiber characteristics of spunlace nonwoven fabric, and the fiber structure will not be damaged during the spraying process, ensuring the original physical properties of the product; 2. This invention is designed with two independent liquid supply units, and the liquid tanks can be used to hold different types of liquids separately. The turntable assembly and the recovery tank are installed at different heights. Combined with the design logic that "a single liquid supply unit is only suitable for double-sided same-liquid spraying", four spraying modes can be flexibly realized: ① Single-sided spraying (only one turntable assembly and corresponding liquid supply unit are used); ② Double-sided same-liquid spraying (two turntable assemblies are used, sharing one liquid supply unit); ③ Front and back side different liquid spraying (two turntable assemblies are connected to different liquid supply units respectively, spraying different functional liquids); ④ Front and back side different concentration spraying (the same liquid is controlled at different concentrations through two liquid supply units and supplied to two turntable assemblies respectively). This design requires no additional equipment or processes, significantly improving production flexibility. 3. Compared to the traditional method of "multiple single-sided spraying to achieve different liquid concentrations," this invention can complete precise spraying of different liquids or concentrations on both sides in a single process, eliminating the need for repeated transport and positioning, significantly saving process time. Simultaneously, the independent liquid supply unit can precisely control the spraying amount on each side, avoiding liquid waste. Combined with differentiated formula design, it reduces unnecessary raw material input, further lowering production costs. 4. The staggered layout of the turntable assembly and recovery tank effectively avoids cross-contamination of upper and lower layers of liquid during double-sided spraying. The two recovery tanks respectively recover excess liquid from the corresponding turntable assembly, resulting in high-purity recovered liquid that can be reused after simple filtration, significantly improving the utilization rate of the moisturizing liquid. Furthermore, the independent liquid supply unit, combined with PLC precise control, ensures uniform spraying amount on the same side and precise controllable liquid concentration on both sides, solving the problem of poor spraying consistency in existing equipment and ensuring stable quality in mass production. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 is a schematic diagram of the overall structure of the invention; Figure 2 is a front view of the invention; Figure 3 is a top view of the invention; Figure 4 is a side view of the invention; Figure 5 is a schematic diagram of the structure of the spraying unit of the invention; In the figures: 1, feeding unit; 2, spraying unit; 3, recovery unit; 4, control system; 5, liquid supply unit; 11, mounting bracket; 12, top drive roller; 13, top side driven roller; 14, middle driven roller group; 15, bottom driven roller; 16, variable frequency speed control motor; 21, low position rotation... 21. Turntable assembly; 22. High-level turntable assembly; 23. Turntable mounting bracket; 24. Turntable assembly; 25. Drive motor; 26. Nozzle; 27. Synchronous pulley; 28. Circular transmission belt; 29. ​​Rotating part; 31. Low-level recovery tank; 32. High-level recovery tank; 41. Electrical cabinet; 42. Touch screen; 43. PLC control module; 44. Audible and visual alarm device; 51. Liquid storage tank; 52. Metering liquid supply pump; 53. Three-way solenoid valve; 54. Stirring device; 55. Liquid level monitoring sensor; 56. Pressure monitoring device. Detailed Implementation

[0017] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0018] In the attached diagram, all identical reference numerals refer to the same components.

[0019] Example 1: Double-sided same-liquid spraying mode. This example is applicable to scenarios where the front and back sides of cotton soft towel spunlace nonwoven fabric need to be sprayed with the same moisturizing liquid. The specific structure and connection relationship are as follows: As shown in Figures 1-2, the feeding unit 1 includes a mounting frame 11, a top drive roller 12, a top side driven roller 13, a middle driven roller group 14, a bottom driven roller 15, and a variable frequency speed control motor 16. The top drive roller 12, the top side driven roller 13, the middle driven roller group 14, and the bottom driven roller 15 are all rotatably assembled inside the mounting frame 11 through bearing seats. The middle driven roller group 14 consists of two driven rollers of the same specification arranged in parallel at intervals. The line connecting the axes of the two driven rollers is parallel to the horizontal direction and is staggered with the axes of the top drive roller 12 and the bottom driven roller 15. The variable frequency speed control motor 16 is fixed to the motor mounting base at the bottom of the mounting bracket 11 by bolts. The output shaft of the variable frequency speed control motor and the end of the top drive roller 12 are both fixedly equipped with transmission pulleys. The transmission belt is tensioned and sleeved between the two pulleys to form a belt drive mechanism.

[0020] The spraying unit 2 includes a low-position turntable assembly 21, a high-position turntable assembly 22, a turntable mounting frame 23, a turntable assembly 24, a drive motor 25, a spray nozzle 26, a synchronous pulley 27, a ring-shaped transmission belt 28, and a rotating part 29. The turntable mounting frame 23 is fixed to the inside of the mounting bracket 11 by bolts. The low-position turntable assembly 21 and the high-position turntable assembly 22 are vertically staggered and assembled on the turntable mounting frame 23. The low-position turntable assembly 21 corresponds to the lower surface of the non-woven fabric, and the high-position turntable assembly 22 corresponds to the upper surface of the non-woven fabric.

[0021] As shown in Figure 5, in each turntable group, the number of synchronous pulleys 27 is the same as that of the turntable assembly 24. Each synchronous pulley 27 is fixed to the drive shaft via a key connection, and the drive shaft is mounted on the turntable mounting bracket 23 via a bearing seat. The top end of the rotating part 29 is coaxially and keyedly fixed to the synchronous pulley 27, and the bottom end of the rotating part 29 is threadedly fixed to the top end of the turntable assembly 24, realizing coaxial transmission between the synchronous pulleys 27 and the turntable assembly 24. The nozzles 26 are uniformly assembled around the turntable assembly 24, and the spray direction of the nozzles 26 is towards the non-woven fabric transmission surface. The drive motor 25 is detachably connected to the turntable mounting bracket 23 via a flange. The output shaft of the drive motor is keyed to the active synchronous pulley of the synchronous transmission assembly. The annular transmission belt 28 is sleeved on the outside of all synchronous pulleys 27, forming a series synchronous transmission structure.

[0022] The recycling unit 3 includes a low-level recycling tank 31 and a high-level recycling tank 32. The low-level recycling tank 31 is fixed to the lower part of the low-level turntable assembly 21 by a bracket, and the high-level recycling tank 32 is fixed to the lower part of the high-level turntable assembly 22 by a bracket. The two are arranged vertically at intervals. Both recycling tanks are integral inclined tanks, with the inclined direction facing the liquid collection end. The tank opening size is larger than the spraying width of the corresponding turntable assembly, and the edge of the tank opening is folded upward to form an anti-overflow edge. A detachable mesh protective structure is installed on the inner side of the tank opening by a snap-fit.

[0023] As shown in Figure 3-4, the liquid supply unit 5 includes a liquid storage tank 51, a metering liquid supply pump 52, a three-way solenoid valve 53, a liquid supply pipeline, a stirring device 54, a liquid level monitoring sensor 55, and a pressure monitoring device 56. The liquid storage tank 51 is a stainless steel sealed box with a feeding port and a vent valve at the top; the feeding port is fitted with a sealing cap. The stirring device 54 is mounted on the bottom surface inside the liquid storage tank 51. The stirring shaft of the stirring device 54 is arranged along the length of the liquid storage tank 51, and multiple stirring blades are fixed on the shaft. The stirring device 54 is electrically connected to the PLC control module 43. The liquid level monitoring sensor 55 is installed on the inner wall of the liquid storage tank 51, with its detection end extending to the lower area of ​​the liquid storage tank 51. The liquid level monitoring sensor 55 is electrically connected to the PLC control module 43.

[0024] The inlet of the metering pump 52 is connected to the outlet of the storage tank 51 via a supply pipeline, and the outlet of the metering pump 52 is connected to the inlet of the three-way solenoid valve 53 via a supply pipeline. The two outlets of the three-way solenoid valve 53 are connected to the nozzles 26 of the low-level rotary table group 21 and the high-level rotary table group 22 via supply pipelines, respectively, to achieve synchronous supply of liquid to the two rotary table groups by a single supply unit. The pressure monitoring device 56 is connected in series in the supply pipeline at the outlet of the metering pump 52, and the signal output of the pressure monitoring device 56 is electrically connected to the PLC control module 43.

[0025] The control system 4 includes an electrical cabinet 41, a touch screen 42, a PLC control module 43, and an audible and visual alarm device 44. The electrical cabinet 41 has partitioned installation areas, with the PLC control module 43, power module, relay group, and terminal block installed in their respective areas. The cabinet door is equipped with a cooling fan and an observation window. The touch screen 42 is an industrial-grade touch display screen, connected to the PLC control module 43 via a communication cable. The audible and visual alarm device 44 is mounted in a prominent position on the equipment via a bracket, and its signal input is electrically connected to the output of the PLC control module 43. The PLC control module 43 is electrically connected to the variable frequency speed control motor 16, the drive motor 25, the metering liquid supply pump 52, the stirring device 54, the liquid level monitoring sensor 55, and the pressure monitoring device 56, forming a complete process control loop.

[0026] Workflow: 1. Parameter setting and preparation: Select the "double-sided same liquid spraying" mode via touch screen 42, and input parameters such as non-woven fabric transmission speed, moisturizing liquid spraying flow rate, and turntable assembly rotation speed 24; open the filling port sealing cover of the liquid storage tank 51, inject the preset type of moisturizing liquid, close the sealing cover and ensure that the vent valve is unobstructed; the PLC control module 43 receives the signal from the liquid level monitoring sensor 55, and after confirming that the liquid storage volume meets the standard, it feeds back to the touch screen 42 to display the "ready" status.

[0027] 2. Equipment Start-up and Pre-treatment: Turn on the main switch of the equipment. The PLC control module 43 triggers the stirring device 54 to start. The stirring device 54 stirs the moisturizing liquid in the storage tank 51 at the preset speed to ensure uniform concentration. After stirring for 30 seconds, it maintains low-speed operation. At the same time, the variable frequency speed control motor 16 starts at the set speed and drives the top drive roller 12 to rotate through the belt drive, thereby driving the entire roller group to operate. The non-woven fabric roll is led out by the unwinding mechanism and passes through the top side driven roller 13, the top drive roller 12, the middle driven roller group 14, and the bottom driven roller 15 in sequence to form a stable transmission path.

[0028] 3. Synchronous spraying operation: The PLC control module 43 starts the drive motor 25 and the metering liquid supply pump 52 in conjunction. The drive motor 25 drives all the turntable components 24 of the low-position turntable group 21 and the high-position turntable group 22 to rotate synchronously through the synchronous pulley 27 and the annular transmission belt 28. The metering liquid supply pump 52 pressurizes the moisturizing liquid in the storage tank 51 and delivers it to the three-way solenoid valve 53. After being diverted, it is delivered to the nozzles 26 of the two turntable groups respectively. Under the action of centrifugal force of the rotating turntable components 24, the nozzles 26 atomize the moisturizing liquid evenly and spray it onto the upper and lower surfaces of the nonwoven fabric. The staggered roller groups extend the residence time of the nonwoven fabric in the spraying area to ensure that the moisturizing liquid fully penetrates.

[0029] 4. Waste liquid recovery and filtration: Excess moisturizing liquid that is not absorbed by the non-woven fabric drips down along the direction of gravity and falls into the low-level recovery tank 31 and the high-level recovery tank 32 directly below. The grid protection structure in the recovery tank intercepts impurities such as non-woven fabric debris generated during the spraying process. The filtered moisturizing liquid flows along the inclined tank to the converging end and can be directly recycled or temporarily stored after being discharged through the recovery pipeline. The anti-overflow edge effectively prevents the moisturizing liquid from overflowing and contaminating the equipment.

[0030] 5. Status monitoring and closed-loop control: The PLC control module 43 receives the pipeline pressure signal from the pressure monitoring device 56 and the liquid level signal from the liquid level monitoring sensor 55 in real time. If the pressure exceeds the set range, the speed of the metering supply pump 52 is automatically adjusted. If the liquid level is lower than the threshold, the audible and visual alarm device 44 is triggered to issue a warning, and the touch screen 42 displays the "insufficient liquid level" prompt. After the non-woven fabric is sprayed, it is discharged through the bottom driven roller 15 and enters the subsequent winding or processing steps. During the operation of the equipment, the cooling fan in the electrical cabinet 41 works continuously to ensure the stable operation of the electrical components.

[0031] 6. Shutdown Procedure: After the production task is completed, a shutdown command is issued through the touch screen 42. The PLC control module 43 sequentially shuts down the metering liquid supply pump 52, the drive motor 25, and the variable frequency speed control motor 16. The stirring device 54 continues to run for 1 minute before stopping. The drain valve at the bottom of the storage tank 51 is opened to drain the residual liquid. The mesh protective structure inside the recycling tank is disassembled and cleaned to complete the equipment maintenance.

[0032] Example 2: Double-sided Different Liquid Spraying Mode This example is applicable to scenarios where different functional liquids (such as moisturizing liquid on one side and soothing liquid on the other) need to be sprayed on the front and back sides of cotton soft towel spunlace nonwoven fabric. The structure and connection relationship are adjusted based on Example 1 as follows: Two independent liquid supply units 5 are arranged in parallel. The liquid storage tank 51 of the first liquid supply unit holds moisturizing liquid, and the liquid storage tank 51 of the second liquid supply unit holds soothing liquid. The outlet end of the metering liquid supply pump 52 of the first liquid supply unit is directly connected to the nozzle 26 of the low-position turntable group 21 through the liquid supply pipeline. The outlet end of the metering liquid supply pump 52 of the second liquid supply unit is directly connected to the nozzle 26 of the high-position turntable group 22 through the liquid supply pipeline. The cross-group connection of the three-way solenoid valve 53 is eliminated, realizing independent liquid supply for the two turntable groups.

[0033] The structure and connection relationship of the feeding unit 1, the spraying unit 2, the recycling unit 3, and the control system 4 are the same as in Example 1. The low-level recycling tank 31 only recycles the moisturizing liquid of the low-level turntable group 21, and the high-level recycling tank 32 only recycles the soothing liquid of the high-level turntable group 22, so as to avoid cross-contamination of different liquids.

[0034] The "Double-sided Different Liquid" mode is selected via touchscreen 42, and the flow rates of the metering pumps 52 of the two liquid supply units 5, the speeds of the two drive motors 25, and the transmission speed of the variable frequency speed control motor 16 are set respectively. After startup, the first liquid supply unit supplies liquid to the lower turntable group 21, and the second liquid supply unit supplies liquid to the higher turntable group 22. The PLC control module 43 coordinates and regulates each motor and liquid supply pump to ensure that the non-woven fabric is simultaneously and accurately coated with different liquids on both sides. The liquids collected by the recycling unit 3 are filtered and can be recycled and reused to improve resource utilization.

[0035] Example 3: Single-sided spraying + different concentration spraying composite mode. This example is applicable to scenarios where only one side of the cotton soft towel spunlace nonwoven fabric needs to be sprayed, or where the front and back sides need to be sprayed with the same liquid at different concentrations. The structure and connection relationship are as follows: When only one side needs to be sprayed, the drive motor 25 of one set of turntables and the metering liquid supply pump 52 of the corresponding liquid supply unit 5 are turned off. The distance between the working turntable set and the nonwoven fabric transmission surface is finely adjusted through the elongated adjustment hole on the turntable mounting bracket 23. When different concentrations of spraying are required on the front and back sides, the liquid storage tanks 51 of the two liquid supply units 5 contain the same type but different concentrations of moisturizing liquid. The first liquid supply unit is adjusted to a low concentration liquid supply flow rate through the metering liquid supply pump 52 and connected to the low-position turntable set 21; the second liquid supply unit is adjusted to a high concentration liquid supply flow rate and connected to the high-position turntable set 22. The rest of the structure is the same as in Example 1.

[0036] When the "single-sided spraying" mode is selected, only the drive motor 25 and metering pump 52 on the working side are started. The non-woven fabric is conveyed to the spraying area through the feeding unit 1, and the single-sided turntable assembly completes precise spraying. Excess liquid falls into the corresponding recovery tank. When the "different concentration spraying" mode is selected, the PLC control module 43 adjusts the different flow rates of the two metering pumps 52 according to the set concentration parameters, and simultaneously matches the transmission speed of the variable frequency speed control motor 16 with the rotation speed of the two sets of drive motors 25 to ensure uniform concentration on both sides and meet design requirements. This mode does not require additional equipment, realizes flexible switching of various processing needs, and greatly improves production flexibility.

[0037] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A rotary spray device for moisturizing nonwoven fabrics, characterized in that, The system includes a feeding unit (1), a spraying unit (2), and a recycling unit (3) arranged along the nonwoven fabric conveying direction, as well as a control system (4) and two independent liquid supply units (5); the spraying unit (2) is integrated inside the mounting bracket (11) of the feeding unit (1), and the recycling unit (3) is located below the spraying unit (2); the feeding unit (1) includes a mounting bracket (11) and rollers and a variable frequency speed control motor (16) mounted on it, and the variable frequency speed control motor (16) is connected to the rollers via a belt; the spraying unit (2) includes a turntable mounting bracket (23) and two sets of turntables arranged vertically and vertically, respectively corresponding to the upper and lower surfaces of the nonwoven fabric, each set of turntables Each set includes a drive motor (25), a synchronous transmission assembly, a turntable assembly (24), and a nozzle (26). The drive motor (25) is connected to the turntable assembly (24) via the synchronous transmission assembly, and the nozzle (26) is mounted on the turntable assembly (24). The recycling unit (3) includes two recycling tanks corresponding to the two turntable sets. The control system (4) includes an electrical cabinet (41), a touch screen (42), and a PLC control module (43). The PLC control module (43) is electrically connected to the variable frequency speed control motor (16), the drive motor (25), and the liquid supply unit (5), respectively. The two independent liquid supply units (5) are connected to the two turntable sets one by one via independent pipelines.

2. The rotary spray device for moisturizing nonwoven fabrics according to claim 1, characterized in that, The roller group of the feeding unit (1) includes a top drive roller (12), a top side driven roller (13), a middle driven roller group (14), and a bottom driven roller (15). The middle driven roller group (14) is composed of two driven rollers of the same specifications, which are assembled in parallel and spaced apart. The axis connecting the two driven rollers is parallel to the horizontal direction and is staggered with the axis of the top drive roller (12) and the bottom driven roller (15). The nonwoven fabric passes through the two driven rollers of the top side driven roller (13), the top drive roller (12), the middle driven roller group (14), and the bottom driven roller (15) in sequence. The variable frequency speed control motor (16) is fixedly mounted on the motor mounting base at the bottom of the mounting bracket (11) by bolts. Its output shaft and the end of the top drive roller (12) are both equipped with transmission pulleys, and the transmission belt is tensioned and sleeved between the two pulleys.

3. The rotary spray device for moisturizing nonwoven fabrics according to claim 1, characterized in that, The two sets of turntables are a low-position turntable group (21) and a high-position turntable group (22). The low-position turntable group (21) is arranged on the lower surface of the nonwoven fabric, and the high-position turntable group (22) is arranged on the upper surface of the nonwoven fabric. The synchronous transmission assembly consists of multiple synchronous pulleys (27) arranged in series and a ring transmission belt (28). The number of synchronous pulleys (27) corresponds one-to-one with the number of turntable assemblies (24). Each synchronous pulley (27) is fixed to the transmission shaft by a key connection. The turntable mounting frame (23) The drive shaft is mounted on the turntable mounting bracket (23) inside the mounting bracket (11) of the feeding unit (1) through the bearing seat; the top of the turntable assembly (24) is fixed to the rotating part (29) through a threaded connection, and the top of the rotating part (29) is coaxially and fixed to the synchronous wheel (27); the nozzles (26) are evenly distributed along the circumference of the turntable assembly (24), the spray direction of the nozzles (26) is towards the non-woven fabric, and the spray angle can be finely adjusted according to the thickness of the non-woven fabric.

4. A rotary spray device for moisturizing nonwoven fabrics according to claim 3, characterized in that, The two recycling tanks of the recycling unit (3) are a low-level recycling tank (31) and a high-level recycling tank (32). The low-level recycling tank (31) is located directly below the low-level turntable group (21), and the high-level recycling tank (32) is located directly below the high-level turntable group (22). The two are spaced apart in the vertical direction. Both recycling tanks are integrated inclined tank structures, and the inclined direction of the tank is towards the liquid converging end. The size of the tank opening is larger than the spraying width of the corresponding turntable group. The edge of the tank opening is folded upward to form an anti-overflow edge. A detachable mesh protection structure is installed on the inner side of the tank opening.

5. A rotary spray device for moisturizing nonwoven fabrics according to claim 1, characterized in that, The liquid supply unit (5) includes a sealed liquid storage tank (51), a metering liquid supply pump (52), a three-way solenoid valve (53), a frequency conversion stirring device (54), a liquid level monitoring sensor (55), and a liquid supply pipeline. The three-way solenoid valve (53) is used to realize the liquid supply diversion switching when spraying the same liquid on both sides. The liquid storage tank (51) is a sealed box made of stainless steel. The top of the box is equipped with a feeding port and a vent valve. A sealing cover is installed at the feeding port. The bottom of the liquid storage tank (51) is equipped with a frequency conversion stirring device (54). The frequency conversion stirring device (54) is electrically connected to the PLC control module (43). The stirring speed can be adjusted according to the liquid level in the liquid storage tank (51). The stirring shaft of the stirring device (54) is set along the length of the storage tank (51), and multiple stirring blades are fixed on the shaft; a liquid level monitoring sensor (55) is installed on the inner wall of the storage tank (51), and the detection end of the liquid level monitoring sensor (55) extends to the lower area of ​​the storage tank (51); the inlet end of the metering pump (52) is connected to the outlet of the storage tank (51) through a pipeline, and the outlet end is connected to the inlet end of the three-way solenoid valve (53) through a pipeline; the two outlet ends of the three-way solenoid valve (53) are respectively connected to the nozzles (26) of the corresponding turntable group through pipelines; the liquid level monitoring sensor (55) is electrically connected to the PLC control module (43).

6. A rotary spray device for moisturizing nonwoven fabrics according to claim 5, characterized in that, The metering pump (52) is a variable frequency adjustable metering pump. A flow regulation module is integrated on the pump body. The flow regulation module is electrically connected to the PLC control module (43). A pressure monitoring device (56) is connected in series in the outlet pipeline of the metering pump (52). The signal output end of the pressure monitoring device (56) is electrically connected to the PLC control module (43).

7. A rotary spray device for moisturizing nonwoven fabrics according to claim 1, characterized in that, The integrated electrical cabinet (41) of the control system (4) has a partitioned installation area inside, which is used to install the PLC control module (43), power module, relay group and terminal block respectively. The cabinet door of the electrical cabinet (41) is equipped with a cooling fan and an observation window. The human-machine interaction touch screen (42) is an industrial-grade touch screen, which is connected to the communication interface of the PLC control module (43) through a communication cable. The control system (4) also includes an external sound and light alarm device (44), which is installed in a conspicuous position of the equipment through a bracket. Its signal input terminal is electrically connected to the output terminal of the PLC control module (43). The integrated electrical cabinet (41) and the touch screen (42) can be installed separately and can be connected by extending the communication line.

8. A rotary spray device for moisturizing nonwoven fabrics according to claim 3, characterized in that, The drive motor (25) of the spraying unit (2) is detachably assembled with the turntable mounting bracket (23) via a flange. The motor output shaft is connected to the active synchronous wheel (27) of the synchronous transmission component via a key. The turntable assembly (24), the synchronous wheel (27) of the synchronous transmission component, and the rotating part (29) adopt the same series of standardized structural designs, and the connection interfaces between the components are unified. The turntable mounting bracket (23) is provided with a long strip-shaped adjustment hole for fine-tuning the distance between the turntable assembly (24) and the non-woven fabric transmission surface. The device as a whole supports left- or right-handed installation and the assembly direction of the feeding unit (1) and the spraying unit (2) can be changed.

9. A rotary spray device for moisturizing nonwoven fabrics according to claim 1, characterized in that, The liquid supply unit (5) is adapted to water-based moisturizing liquid, and the liquid supply pipeline is made of food-grade hose; the liquid supply pipeline length of each turntable assembly (24) in the same turntable group is consistent, and the model and specifications of each nozzle (26) are the same.

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