An air-laid machine for uniform web formation

Abstract

The application discloses an air-laid machine for uniform netting, comprising a frame for providing a supporting installation reference; a cotton feeding unit arranged at one end of the frame for continuously outputting fiber raw materials; and a conveying netting unit arranged at the other end of the frame for providing a bearing surface for fiber netting and conveying a formed fiber net. The application divides the flow guide channel into an upper flow section, a middle flow section and a lower flow section, and sets a fiber guide component in the middle flow section to form a multi-stage continuous fiber guide channel. When the mixed fiber raw materials flow along the flow guide channel, the fiber guide channel can first guide and converge part of the layered fiber raw materials, and then perform secondary deviation correction on the outflow part of the layered fiber raw materials, so that full coverage and continuous guidance mixing of the layered fiber raw materials are realized. Meanwhile, the staggered interval type channel structure of the fiber guide channel will not block the airflow, can effectively avoid the retention, wall-hanging accumulation and channel blockage of the fiber raw materials, and continuously ensures the uniform and stable flow of the fiber airflow.

Description

Technical Field

[0001] This invention relates to the field of airflow web forming machine technology, and more particularly to an airflow web forming machine for uniform web forming. Background Technology

[0002] Airflow web forming machines are the core equipment for implementing airflow web forming technology and are basic production machinery in nonwoven fabric production. Unlike traditional mechanical carding web forming equipment, the entire machine integrates core structures such as licker-in rollers or cylinder carding components, airflow conveying ducts, and negative pressure web forming devices, achieving fiber forming based on airflow dynamics. Its most significant feature is its ability to create a three-dimensional randomized fiber distribution structure, producing a web with balanced mechanical properties in all directions, high bulkiness, and uniform texture. The equipment has strong raw material adaptability, compatible with various short fibers, regenerated fibers, and blended fibers. Furthermore, its compact design and strong operational stability make it widely used in the large-scale production of various nonwoven materials such as hygiene products, thermal insulation fillings, industrial base fabrics, and cushioning protection.

[0003] Currently, existing airflow web forming machines primarily involve feeding fiber raw materials, which are then high-speed combed into single fibers by licker-in rollers or cylinders. Under the combined action of centrifugal force and airflow, the fibers detach from the serrations of the carding cloth and diffuse through an air duct, eventually depositing onto a conveyor screen to form a fiber web. However, due to the wide variety of raw materials that can be processed, they are often suitable for mixed fiber raw materials of various specifications. Different fibers have inherent differences in their weight, density, and motion inertia. When the detached mixed fiber raw materials flow in the guide channel, the fibers of different weights tend to stratify due to inertial characteristics. However, existing guide channels are mostly integrated straight-through structures, which, due to their own channel layout limitations, make it difficult to effectively guide and mix the stratified fibers during fiber conveying, resulting in uneven fiber stratification after web formation.

[0004] Therefore, this application proposes an airflow web forming machine for uniform web formation to address the above-mentioned shortcomings. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing an airflow web forming machine for uniform web formation.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: An airflow web forming machine for uniform web formation, comprising: The rack is used to provide a support mounting reference; The cotton feeding unit is located at one end of the frame and is used to continuously output fiber raw materials; The web-forming conveyor unit, located at the other end of the frame, is used to provide a bearing surface for fiber web formation and to convey the formed fiber web. The flow channel is located between the cotton feeding unit and the conveying and web forming unit to provide a stable flow path for the fiber airflow. The blowing unit is located at the top of the guide channel and is used to blow away the fiber raw material output from the cotton feeding unit and send it into the guide channel. The suction unit is located inside the conveying and networking unit. It works with the blowing unit to create a directional flow field that runs through the guide channel and forms a negative pressure field on the conveying and networking unit. The cotton pressing unit is located at the bottom of the guide channel and above the conveying and forming unit, and is connected to the air passage of the suction unit. It is used to compact the falling fiber raw material and at the same time to draw out excess air from the fiber airflow. The flow channel includes an upper section, a middle section, and a lower section in sequence along the fiber airflow direction. The carding roller of the cotton feeding unit extends into the middle section, and a fiber guiding component is provided below it to guide the upper and lower layered fiber raw materials in both directions so that they can converge in the central area of ​​the flow channel. The lower section is provided with a swingable pressure plate to quickly press the fiber raw materials converged by the fiber guiding component towards the conveying and web forming unit.

[0007] As a further embodiment of the present invention, the fiber guiding component includes a first guide and a second guide arranged sequentially along the fiber airflow direction; The first guide includes a plurality of first upper arc-shaped guide plates and first lower arc-shaped guide plates symmetrically disposed on the top and bottom sides inside the middle flow section, and the first upper arc-shaped guide plates and the first lower arc-shaped guide plates are staggered. The second guide includes several second upper arc-shaped guide plates and second lower arc-shaped guide plates symmetrically arranged on the top and bottom sides inside the middle flow section. The second upper arc-shaped guide plates and the second lower arc-shaped guide plates are staggered. The second upper arc-shaped guide plates are arranged on the path between two adjacent first upper arc-shaped guide plates, and the first lower arc-shaped guide plates are arranged on the path between two adjacent second lower arc-shaped guide plates, forming a continuous staggered fiber guiding channel.

[0008] As a further embodiment of the present invention, the roots of the first upper arc-shaped guide plate, the first lower arc-shaped guide plate, the second upper arc-shaped guide plate, and the second lower arc-shaped guide plate are smoothly transitioned to the inner wall of the middle flow section by an inclined surface, and the middle part is provided with a circular arc surface, and the ends are arranged parallel to the fiber airflow direction.

[0009] As a further embodiment of the present invention, a support plate is provided at the end of the lower flow section above the pressure plate, and two support cylinders are symmetrically arranged on the top of the support plate. A first spring is provided at the bottom of the inner part of the support cylinder, and a stop block is connected to the top of the first spring. The stop block is in a sealing sliding fit with the inner wall of the support cylinder. A fixing column is fixedly connected to the bottom of the stop block, and a fixing arm is rotatably connected between the bottom of the fixing column and the support plate. A pneumatic mechanism is provided at the top of the support cylinder. The pneumatic mechanism is used to drive the stop block to move back and forth inside the support cylinder, so as to drive the pressure plate to swing back and forth.

[0010] As a further embodiment of the present invention, the pneumatic mechanism includes a connecting pipe disposed between the top ends of two support cylinders, an air extraction pipe disposed in the middle of the top end of the connecting pipe, a high-frequency solenoid valve disposed at the bottom end of the air extraction pipe, and the top end of the air extraction pipe being connected to the air passage of the suction unit. The top end of the support cylinder is also provided with a ventilation component, which is used to enable the support cylinder to communicate with the outside atmosphere when the high-frequency solenoid valve is disconnected.

[0011] As a further aspect of the present invention, the ventilation assembly includes: A vent is located on the top of the support cylinder near the connecting pipe. A variable diameter guide rod is inserted through the vent hole, with its bottom end connected to the stop block and its top end extending to the outside of the support cylinder. The second spring is sleeved outside the variable diameter guide rod and located inside the support cylinder. The two ends of the second spring are fixedly connected to the stop block and the support cylinder, respectively.

[0012] As a further embodiment of the present invention, the upper section diameter of the variable diameter guide rod is larger than the lower section diameter, and the lower section diameter of the variable diameter guide rod is smaller than the diameter of the vent hole. The upper section diameter of the variable diameter guide rod is adapted to the vent hole diameter, and the top end of the variable diameter guide rod is provided with a protrusion larger than the vent hole diameter.

[0013] As a further embodiment of the present invention, the flow guiding channel is provided with a flow equalization and pressure distribution mechanism. The flow equalization and pressure distribution mechanism includes two baffles symmetrically arranged inside the upper flow section. One end of the two baffles is symmetrically provided with a connecting shaft, and the inner side of the two baffles is provided with a flow equalization component. A synchronization component is provided between the ends of the two connecting shafts for driving the two baffles to deflect synchronously.

[0014] As a further embodiment of the present invention, the flow equalization component includes a plurality of elastic flow guiding fins and a plurality of flow guiding grooves arrayed above the side wall of the baffle. The root of the elastic guide fin is fixedly connected to the baffle, and its head can be elastically deflected in the direction of fiber airflow. The windward side of the elastic guide fin is provided with a wedge. The inlet of the flow guide groove faces the gap between two adjacent sets of elastic flow guide fins, and the groove body of the flow guide groove is arranged in a right-deep and left-shallow and right-narrow and left-wide pattern along the fiber airflow direction.

[0015] As a further aspect of the present invention, the synchronization component includes: A protective cover is provided on the side wall of the frame, and a spiral frame is slidably connected inside the protective cover. The spiral frame has toothed plates symmetrically arranged at both ends. One end of each of the two connecting shafts extends into the protective cover and is provided with a gear, and the two gears mesh with the two toothed plates respectively. An electric push rod is located at one end of the protective cover, and the output end of the electric push rod extends into the protective cover and is fixedly connected to the U-shaped frame.

[0016] The technical effects and advantages provided by the present invention in the above technical solution are as follows: This invention divides the flow channel into an upper section, a middle section, and a lower section. A fiber guiding component is set in the middle section to form a multi-level continuous fiber guiding channel. When the mixed fiber raw material flows along the flow channel, the fiber guiding channel can first guide and converge some of the layered fiber raw material, and then perform secondary correction on the outflowing layered fiber raw material. This achieves full coverage and continuous guidance and mixing of the layered fiber raw material. At the same time, the staggered channel structure of the fiber guiding channel does not block the airflow, which can effectively avoid fiber raw material retention, wall accumulation, and channel blockage, and continuously ensure uniform and stable fiber airflow. Furthermore, by setting a pressure plate in the lower section, in conjunction with a support cylinder and pneumatic mechanism, the high-frequency solenoid valve opens and the pressure plate automatically deflects upward under the linkage of negative pressure traction. When the high-frequency solenoid valve closes and the pressure plate resets, it quickly deflects downward. When the fiber raw material, after being guided, corrected, and mixed, flows to the end of the lower section, the high-frequency reciprocating oscillation of the pressure plate can quickly press the fiber raw material onto the conveyor screen of the conveying and web forming unit. This prevents the mixed fiber raw material from scattering and becoming disordered and secondarily stratified during the falling process, and achieves orderly and regular spreading and forming of the fiber raw material. This effectively improves the fiber stratification phenomenon and greatly improves the uniformity of web formation. By setting a flow equalization and pressure distribution mechanism in the upper section, the two baffles on the flow equalization and pressure distribution mechanism deflect inward or outward simultaneously to control the size of the airflow opening, thereby achieving precise control of the airflow pressure and airflow velocity inside the guide channel, thus adapting to the conveying needs of fiber raw materials with different basis weights and different thicknesses, and further ensuring the uniformity of fiber conveying and web formation. By setting up flow equalization components on the windward side of the baffle, the airflow can be sorted and guided by the array of elastic guide fins on the flow equalization components. In addition, with the adaptive deflection and wedges of the elastic guide fins, the strong airflow can be further throttled, buffered and diverted, reducing airflow impact and disturbance, and stabilizing the internal flow field wind pressure. Through the gradual flow guide groove on the flow equalization component, the airflow through the elastic flow guide fins can converge into the flow guide groove, so that the airflow is evenly diffused and distributed along the flow guide groove, correcting the airflow deviation, and further playing the role of rectification and equalizing the wind force distribution. In this way, it can effectively achieve uniform airflow pressure and consistent flow velocity in the flow guide channel, greatly improving the uniformity of fiber conveying and web formation. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a side view of the present invention; Figure 3 This is a top view of the present invention; Figure 4 This is one of the structural schematic diagrams of the flow guiding channel of the present invention; Figure 5 This is a second schematic diagram of the flow guiding channel of the present invention; Figure 6 This is the third schematic diagram of the flow guiding channel of the present invention; Figure 7 This is a schematic diagram of the connection between the pressure plate and the flow guide channel of the present invention; Figure 8 This is one of the structural schematic diagrams of the fiber guiding component of the present invention; Figure 9 This is a second schematic diagram of the fiber guiding component of the present invention; Figure 10 This is a schematic diagram of the internal structure of the protective cover of the present invention; Figure 11 This is a schematic diagram of the structure of the baffle of the present invention; Figure 12 This is a partial cross-sectional view of the baffle of the present invention; Figure 13 This is a schematic diagram of the structure of the pressure plate of the present invention when it is deflected upward; Figure 14 This is a schematic diagram of the structure when the pressure plate of the present invention deflects downward.

[0018] In the diagram: 1. Frame; 2. Feeding unit; 3. Conveying and web-forming unit; 4. Suction unit; 5. Blowing unit; 6. Pressing unit; 7. Guide channel; 8. Fiber guiding component; 801. First upper arc-shaped guide plate; 802. First lower arc-shaped guide plate; 803. Second upper arc-shaped guide plate; 804. Second lower arc-shaped guide plate; 9. Pressing plate; 901. Support plate; 902. Support cylinder; 903. Connecting pipe; 904. High-frequency solenoid valve; 9 05. Suction pipe; 906. Stop block; 907. Fixing column; 908. Fixing arm; 909. First spring; 10. Vent hole; 1001. Variable diameter guide rod; 1002. Second spring; 11. Baffle; 1101. Elastic guide fin; 1102. Wedge; 1103. Guide groove; 1104. Connecting shaft; 12. Protective cover; 1201. Ring frame; 1202. Toothed plate; 1203. Gear; 13. Electric push rod. Detailed Implementation

[0019] To enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] like Figures 1-6 As shown, this invention proposes an airflow web forming machine for uniform web formation, comprising a frame 1, a feeding unit 2, a conveying web forming unit 3, a guide channel 7, a blowing unit 5, a suction unit 4, and a pressing unit 6; wherein the frame 1 provides a supporting mounting reference for each unit component; the feeding unit 2 is located at one end of the frame 1 and is used for continuously outputting fiber raw materials; the conveying web forming unit 3 is located at the other end of the frame 1 and is used for providing a bearing surface for fiber web formation and conveying the formed fiber web; the guide channel 7 is located between the feeding unit 2 and the conveying web forming unit 3. The blowing unit 5 is located at the top of the guide channel 7 to provide a stable flow path for the fiber airflow. It blows the fiber material output from the cotton feeding unit 2 and sends it into the guide channel 7. The suction unit 4 is located inside the conveying and web-forming unit 3, working with the blowing unit 5 to create a directional flow field that runs through the guide channel 7 and forms a negative pressure field on the conveying and web-forming unit 3. The pressing unit 6 is located at the bottom of the guide channel 7 and above the conveying and web-forming unit 3, and is connected to the suction unit 4 via an air path. It is used to compact the falling fiber material and simultaneously draw air from the fiber airflow. Excess air; the cotton feeding unit 2 continuously and evenly outputs loose fiber raw materials, and the blowing unit 5, in conjunction with the cotton feeding unit 2, blows the output fiber raw materials away and sends them into the guide channel 7. The guide channel 7 provides a regular and stable flow path for fiber airflow. The suction unit 4 and the blowing unit 5 work together to construct a directional airflow field that runs through the guide channel 7. The fiber raw materials are pulled down in an orderly manner along the guide channel 7 by the air pressure difference. At the same time, a stable negative pressure adsorption field is formed inside the conveying and web forming unit 3. The cotton pressing unit 6 is located at the bottom of the guide channel 7 and above the conveying and web forming unit 3 and is connected to the air passage of the suction unit 4. During the fiber falling process, the fiber raw materials are compacted and regularized. Excess air in the fiber airflow is simultaneously sucked out, and the fiber movement trajectory is constrained. This effectively avoids uneven fiber distribution, so that the fibers are evenly attached to the bearing surface of the conveying and web forming unit 3 (conveying screen) under the negative pressure adsorption to form a uniform fiber web. Then, the conveying and web forming unit 3 (conveying screen) continuously and steadily conveys the formed fiber web outward, thereby realizing continuous, stable and uniform airflow web forming operation of the whole machine.

[0021] It should be noted that the specific installation structure, connection method and components of the cotton feeding unit 2, conveying and forming unit 3, blowing unit 5, suction unit 4 and pressing unit 6 involved in this invention are all common knowledge in the field (for example, refer to the cotton feeding mechanism, airflow dispersion mechanism, forming mechanism and pressing mechanism disclosed in patent number CN105624923B, patent name is an airflow forming machine, etc.). Not all of them are shown in the figure and are not the focus of the improvement of this invention, so they will not be described in detail.

[0022] like Figure 4 , Figure 5 and Figure 6 As shown, the flow channel 7 includes an upper section, a middle section and a lower section in sequence along the fiber airflow direction. The carding roller of the cotton feeding unit 2 extends into the middle section, and a fiber guiding component 8 is provided below it to guide the upper and lower layered fiber raw materials in both directions so that they can converge in the central area of ​​the flow channel 7. In one specific embodiment of the present invention, please refer to the following: Figure 8 and Figure 9 It is known that the fiber guiding component 8 includes a first guide and a second guide arranged sequentially along the fiber airflow direction; wherein, the first guide includes a plurality of first upper arc-shaped guide plates 801 and first lower arc-shaped guide plates 802 symmetrically arranged on the top and bottom sides inside the middle flow section, and the first upper arc-shaped guide plates 801 and first lower arc-shaped guide plates 802 are staggered; the second guide includes a plurality of second upper arc-shaped guide plates 803 and second lower arc-shaped guide plates 804 symmetrically arranged on the top and bottom sides inside the middle flow section, and the second upper arc-shaped guide plates 803 and second lower arc-shaped guide plates 804 are staggered. The second upper arc-shaped guide plate 803 is arranged on the path between two adjacent first upper arc-shaped guide plates 801, and the first lower arc-shaped guide plate 802 is arranged on the path between two adjacent second lower arc-shaped guide plates 804, forming a continuous and interlaced fiber guiding channel. The fiber guiding component 8 further forms a multi-stage continuous fiber guiding channel within the flow channel 7. The fiber guiding component 8 consists of a first guide and a second guide distributed sequentially upstream and downstream along the airflow. When the detached mixed fiber material flows within the flow channel 7, the fiber materials of different weights are prone to stratification due to differences in inertia. When it flows through the fiber guiding channel in the middle section of the flow channel 7, the first upper arc-shaped guide plate 801 on the first guide smoothly intercepts and guides the lighter portion of the fiber material in the upper layer, causing it to converge in the middle of the flow channel 7. In the conveying process, the first lower arc-shaped guide plate 802 can smoothly guide the heavier fiber material in the lower layer and convey it to the center. Because it is distributed in an alternating pattern, it avoids blockage, while some fiber material that is not guided can continue to flow forward through the gaps. Then, the lighter fiber material that leaks out from the top encounters the second upper arc-shaped guide plate 803 in front. The second upper arc-shaped guide plate 803 can correct and converge it again. Similarly, the heavier fiber material that leaks out from the lower layer converges and corrects itself a second time along the second lower arc-shaped guide plate 804 in front, so that the light and heavy fiber materials are mixed together. Therefore, through the fiber guiding component 8, some layered fiber materials are first guided and gathered, and then the layered fiber materials flowing out of the gaps are corrected and corrected a second time, so as to achieve full coverage and continuous guidance and mixing of layered fiber materials. At the same time, the staggered channel structure will not block the airflow, effectively avoiding fiber material retention, wall accumulation and channel blockage, and continuously ensuring uniform and stable flow of fiber airflow.

[0023] The roots of the first upper arc-shaped guide plate 801, the first lower arc-shaped guide plate 802, the second upper arc-shaped guide plate 803, and the second lower arc-shaped guide plate 804 are smoothly transitioned to the inner wall of the middle flow section by an inclined surface, and the middle part is provided with a circular arc surface. The ends are set parallel to the fiber airflow direction. By setting the inclined surface for a smooth transition, the protrusions can be avoided from obstructing the fiber transport. The circular arc surface can be used to pull the fiber. Finally, the ends are set parallel to the fiber airflow direction, so that the pulled fiber can continue to be transported parallel to the fiber airflow direction.

[0024] like Figures 4-7 , Figure 13 and Figure 14 As shown, the lower section of the guide channel 7 is equipped with a swingable pressure plate 9, which is used to quickly press the fiber raw material gathered by the fiber guiding component 8 toward the conveying and web forming unit 3. In one specific embodiment of the present invention, a support plate 901 is provided at the end of the lower flow section above the pressure plate 9. Two support cylinders 902 are symmetrically arranged on the top of the support plate 901. A first spring 909 is provided at the bottom of the inside of the support cylinder 902. A stop block 906 is connected to the top of the first spring 909. The stop block 906 is in a sealing sliding fit with the inner wall of the support cylinder 902. A fixing post 907 is fixedly connected to the bottom of the stop block 906. The bottom of the fixing post 907 passes through the support plate 901 and is rotatably connected to the pressure plate 9 with a fixing arm 908. A pneumatic mechanism is provided at the top of the support cylinder 902. The pneumatic mechanism is used to drive the stop block 906 to move back and forth inside the support cylinder 902, so as to drive the pressure plate 9 to swing back and forth. The pneumatic mechanism includes a connecting pipe 903 located between the top ends of two support cylinders 902. An air extraction pipe 905 is located at the middle of the top end of the connecting pipe 903, and a high-frequency solenoid valve 904 is located at the bottom end of the air extraction pipe 905. The top end of the air extraction pipe 905 is connected to the air passage of the suction unit 4. The top end of each support cylinder 902 is also equipped with a ventilation component to allow the support cylinder 902 to communicate with the outside atmosphere when the high-frequency solenoid valve 904 is disconnected. The air extraction pipe 905 is connected to the air passage of the suction unit 4. Since the suction unit 4 operates continuously during equipment operation... In this state, air can be continuously pumped out of the suction pipe 905, transmitting negative pressure to the connecting pipe 903, thereby simultaneously pumping air out of the upper chambers of the two support cylinders 902. Since the stop block 906 is slidably sealed inside the support cylinder 902, as the air pressure in the upper part continuously decreases, a negative pressure is formed, causing the stop block 906 to experience an upward air pressure force. This forces the stop block 906 to slide upward and stretch the first spring 909, simultaneously causing the fixed column 907 to rise, so that the fixed column 907, through the fixed arm 908, causes the pressure plate 9 to deflect upward. It is worth noting that when the support cylinder 902 is not pumped out, the stop block 906 is at its lowest point inside the support cylinder 902, at which time the first spring 909 remains in its initial state (without tensile deformation).

[0025] The ventilation assembly includes a ventilation hole 10, which is located on the top of the support cylinder 902 near the connecting pipe 903. A variable diameter guide rod 1001 is disposed through the vent hole 10. The bottom end of the variable diameter guide rod 1001 is connected to the stop block 906, and its top end extends to the outside of the support cylinder 902. In this embodiment, the upper diameter of the variable diameter guide rod 1001 is larger than the lower diameter, and the lower diameter of the variable diameter guide rod 1001 is smaller than the diameter of the vent hole 10. The upper diameter of the variable diameter guide rod 1001 is adapted to the diameter of the vent hole 10, and the top end of the variable diameter guide rod 1001 is provided with a protrusion larger than the diameter of the vent hole 10.

[0026] The second spring 1002 is sleeved outside the variable diameter guide rod 1001 and located inside the support cylinder 902. The two ends of the second spring 1002 are fixedly connected to the stop block 906 and the support cylinder 902, respectively.

[0027] As the stop block 906 rises, it simultaneously drives the variable diameter guide rod 1001 to slide upward along the vent hole 10, compressing the second spring 1002. Since the upper diameter of the variable diameter guide rod 1001 matches the diameter of the vent hole 10, and the lower diameter is smaller than the diameter of the vent hole 10, initially the upper section of the variable diameter guide rod 1001 slides along the vent hole 10 to seal it, resulting in no or negligible air leakage. This allows the stop block 906 to continue rising, maintaining the upward deflection of the pressure plate 9. This continues until the stop block 906 drives the variable diameter guide rod 1001 to the preset stroke, at which point the variable diameter guide rod 1001... The lower section corresponds to the vent 10, making the inside and outside of the support cylinder 902 connected and balanced, and the stop block 906 stops moving; when the high-frequency solenoid valve 904 is disconnected, the support cylinder 902 loses the negative pressure traction force. At this time, under the elastic reset action of the first spring 909 and the second spring 1002, the stop block 906 can be quickly driven to drive the fixed column 907 to descend and reset. The fixed column 907 drives the pressure plate 9 to deflect downward quickly through the fixed arm 908. Through the high-speed and periodic on and off switching of the high-frequency solenoid valve 904, in conjunction with the ventilation component, the pressure plate 9 can be continuously oscillating up and down at high frequency in the lower section of the guide channel 7. After being guided, corrected, and mixed by the fiber guiding component 8, the fiber raw material flows to the end of the downstream section. With the high-frequency reciprocating motion of the pressure plate 9, the fiber raw material can be quickly pressed down onto the conveyor screen of the conveying and forming unit 3. This prevents the mixed fiber raw material from scattering and becoming disordered and secondarily layered during the falling process, and achieves orderly and regular spreading and forming of the fiber raw material. This effectively improves the fiber layering phenomenon and greatly enhances the uniformity of the web formation.

[0028] like Figures 4-6 , Figure 10 , Figure 11 and Figure 12 As shown, the flow guiding channel 7 is provided with a flow equalization and pressure distribution mechanism. The flow equalization and pressure distribution mechanism includes two baffles 11 symmetrically arranged inside the upper flow section. A connecting shaft 1104 is symmetrically arranged at one end of the two baffles 11, and a flow equalization component is provided on the inner side of both baffles 11. A synchronization component is provided between the ends of the two connecting shafts 1104 to drive the two baffles 11 to deflect synchronously.

[0029] The flow equalization component includes multiple elastic guide fins 1101 and multiple guide grooves 1103 arranged in an array above the side wall of the baffle 11; The root of the elastic guide fin 1101 is fixedly connected to the baffle 11, and its head can be elastically deflected in the direction of fiber airflow. The windward side of the elastic guide fin 1101 is provided with a wedge 1102. The inlet of the flow channel 1103 faces the gap between two adjacent sets of elastic flow guide fins 1101, and the channel body of the flow channel 1103 is arranged in a right-deep-left-shallow and right-narrow-left-wide pattern along the fiber airflow direction.

[0030] By symmetrically setting flow equalization components on the windward sides of the two baffles 11, and with the help of the array of elastic guide fins 1101 on the flow equalization components, the airflow can be sorted and guided, and the chaotic airflow can be dispersed. Moreover, the greater the wind pressure, the greater the deflection amplitude of the free end of the elastic guide fins 1101, which better forms a throttling buffer and diversion for the strong airflow, weakens the local high pressure, and avoids the direct impact of the airflow causing turbulence, thereby stabilizing the internal flow field wind pressure. At the same time, by setting wedges 1102 on the windward side of the elastic guide fins 1101, the wedges 1102 can divert and break vortices in the oncoming airflow, and evenly divide the concentrated airflow to both sides, further reducing the impact and disturbance of the airflow. Furthermore, the airflow that flows out through the gaps in the elastic guide fins 1101 can converge into the guide channel 1103. Due to the gradual structural design of the guide channel 1103 (the channel is arranged in a right-deep and left-shallow and right-narrow and left-wide pattern along the direction of fiber airflow), the airflow can be guided step by step, so that the airflow is evenly diffused and distributed along the guide channel 1103, correcting the airflow deviation phenomenon, and further playing the role of rectifying and balancing the wind force distribution. In this way, it can effectively achieve uniform airflow pressure and consistent flow velocity throughout the guide channel 7, greatly improving the uniformity of fiber conveying and web formation.

[0031] The synchronization assembly includes: a protective cover 12, located on the side wall of the frame 1, with a loop frame 1201 slidably connected inside the protective cover 12. Gear plates 1202 are symmetrically arranged at both ends of the loop frame 1201. One end of each of the two connecting shafts 1104 extends into the protective cover 12 and is equipped with a gear 1203, with the two gears 1203 meshing with the two gear plates 1202 respectively. An electric push rod 13 is located at one end of the protective cover 12, with its output end extending into the protective cover 12 and fixedly connected to the loop frame 1201. The electric push rod 13 drives the loop frame 1201 to move back and forth within the protective cover 12, causing the loop frame 1201 to synchronously move towards the gears 1203 at both ends via the gear plates 1202. The gear 1203 rotates inward or outward, driving the connecting shaft 1104 to rotate, which in turn drives the connected baffle 11 to rotate. This allows the two baffles 11 to be controlled to deflect synchronously inward or outward. Since the two baffles 11 are symmetrically arranged in the upper section, the cross-section of the airflow can be changed by adjusting the opening size of the two baffles 11, thus achieving precise control of the internal airflow pressure and airflow velocity. When the opening of the two baffles 11 increases, the air pressure inside the channel decreases and the airflow velocity slows down. When the opening of the two baffles 11 decreases, the air pressure inside the channel increases and the airflow velocity speeds up, in order to adapt to the conveying needs of fiber raw materials with different weights and thicknesses, and further ensure the uniformity of fiber conveying and web formation.

[0032] It is worth noting that the deflection angle of the baffle 11 is monitored and precisely controlled in real time by a detection element in conjunction with the control system. For example, an angle sensor can be installed at the end of the connecting shaft 1104. The angle sensor can collect the actual deflection angle between the connecting shaft 1104 and the baffle 11 in real time and feed the angle signal back to the whole machine control system. The control system adjusts the extension and retraction stroke of the electric push rod 13 in a closed loop according to the fiber specifications, the set web weight and the production conditions, thereby precisely limiting the opening and closing degree and ventilation cross-sectional area of ​​the two baffles 11. The installation and arrangement of the angle sensor, the angle signal acquisition and feedback and the logic control method of the control system are all conventional and well-known technical means in the field and are not the focus of the improvement of this invention. Therefore, they will not be described in detail.

[0033] Working principle and usage process: In use, the present invention continuously and uniformly outputs loose fiber raw materials through the cotton feeding unit 2. The blowing unit 5, in conjunction with the cotton feeding unit 2, blows the output fiber raw materials away and sends them into the guide channel 7. The guide channel 7 provides a regular and stable flow path for fiber airflow. The suction unit 4 and the blowing unit 5 work together to construct a directional airflow field that runs through the guide channel 7. The fiber raw materials are drawn downward in an orderly manner along the guide channel 7 by the airflow pressure difference. By adjusting the opening size of the two baffles 11, the airflow pressure and airflow velocity inside the guide channel 7 can be precisely controlled. Furthermore, with the help of the flow equalization components on the baffles 11, the airflow can be combed and guided, and the chaotic airflow can be dispersed to further rectify and balance the airflow distribution. The fiber raw materials are transported within the guide channel 7. During the conveying process, the fiber guiding component 8 achieves full coverage and continuous guidance and mixing of the layered fiber raw materials. After being guided, corrected and mixed by the fiber guiding component 8, the fiber raw materials are quickly pressed down onto the conveying mesh curtain surface of the conveying and forming unit 3 in conjunction with the high-frequency reciprocating oscillation action of the pressure plate 9. Through the negative pressure adsorption field formed inside the conveying and forming unit 3, the fiber raw materials are compacted and regulated by the cotton pressing unit 6 during the fiber falling process. At the same time, excess air in the fiber airflow is sucked out and the fiber movement trajectory is constrained, so that the fibers are evenly attached to the bearing surface of the conveying and forming unit 3 under the negative pressure adsorption to form a uniform fiber web. Then, the conveying and forming unit 3 continuously and steadily conveys the formed fiber web outward, realizing continuous, stable and uniform airflow web forming operation of the whole machine.

[0034] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0035] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. An air-laid machine for uniform web formation, characterized in that include: The frame (1) is used to provide a support mounting reference; The cotton feeding unit (2) is located at one end of the frame (1) and is used to continuously output fiber raw materials; The web forming unit (3) is located at the other end of the frame (1) and is used to provide a bearing surface for fiber web forming and to convey the formed fiber web; The flow channel (7) is located between the cotton feeding unit (2) and the conveying and web forming unit (3) to provide a stable flow path for the fiber airflow; The blowing unit (5) is located at the top of the guide channel (7) and is used to blow away the fiber raw material output from the cotton feeding unit (2) and send it into the guide channel (7). The suction unit (4) is located inside the conveying and networking unit (3), and works with the blowing unit (5) to construct a directional flow field that runs through the guide channel (7), and forms a negative pressure field on the conveying and networking unit (3); The cotton pressing unit (6) is located at the bottom of the guide channel (7) and above the conveying and forming unit (3), and is connected to the air passage of the suction unit (4). It is used to compact the falling fiber raw material and at the same time suck up excess air in the fiber airflow. The flow channel (7) includes an upper section, a middle section and a lower section in sequence along the fiber airflow direction. The carding roller of the cotton feeding unit (2) extends into the middle section and is provided with a fiber guiding component (8) below it, which is used to guide the fiber raw materials in both directions so that they can converge in the central area of ​​the flow channel (7). The lower section is provided with a swingable pressure plate (9), which is used to quickly press the fiber raw materials after they have been converged by the fiber guiding component (8) towards the conveying and web forming unit (3).

2. An air-laid machine for uniform web formation according to claim 1, characterized in that The fiber guiding component (8) includes a first guide and a second guide arranged sequentially along the fiber airflow direction; The first guide includes a plurality of first upper arc-shaped guide plates (801) and first lower arc-shaped guide plates (802) symmetrically disposed on the top and bottom sides inside the middle flow section, and the first upper arc-shaped guide plates (801) and first lower arc-shaped guide plates (802) are staggered. The second guide includes a plurality of second upper arc-shaped guide plates (803) and second lower arc-shaped guide plates (804) symmetrically arranged on the top and bottom sides inside the middle flow section. The second upper arc-shaped guide plates (803) and second lower arc-shaped guide plates (804) are staggered. The second upper arc-shaped guide plates (803) are arranged on the path between two adjacent first upper arc-shaped guide plates (801), and the first lower arc-shaped guide plates (802) are arranged on the path between two adjacent second lower arc-shaped guide plates (804), forming a continuous staggered fiber guiding channel.

3. An air-laid machine for uniform web formation according to claim 2, characterized in that The roots of the first upper arc-shaped guide plate (801), the first lower arc-shaped guide plate (802), the second upper arc-shaped guide plate (803), and the second lower arc-shaped guide plate (804) are smoothly transitioned to the inner wall of the middle flow section through an inclined surface, and the middle part is provided with a circular arc surface, and the ends are arranged parallel to the direction of fiber airflow.

4. An air-laid machine for uniform web formation according to claim 1, characterized in that The end of the lower flow section is provided with a support plate (901) above the pressure plate (9). Two support cylinders (902) are symmetrically arranged on the top of the support plate (901). A first spring (909) is provided at the bottom of the inner part of the support cylinder (902). A stop block (906) is connected to the top of the first spring (909). The stop block (906) is in a sealed sliding fit with the inner wall of the support cylinder (902). A fixing column (907) is fixedly connected to the bottom of the stop block (906). The bottom of the fixing column (907) passes through the support plate (901) and is rotatably connected to the pressure plate (9) with a fixing arm (908). The top of the support cylinder (902) is provided with a pneumatic mechanism, which is used to drive the stop block (906) to move back and forth inside the support cylinder (902) so as to drive the pressure plate (9) to swing back and forth.

5. An air-laid machine for uniform web formation according to claim 4, characterized in that The pneumatic mechanism includes a connecting pipe (903) located between the top ends of two support cylinders (902). A suction pipe (905) is provided at the middle of the top end of the connecting pipe (903). A high-frequency solenoid valve (904) is provided at the bottom end of the suction pipe (905). The top end of the suction pipe (905) is connected to the air passage of the suction unit (4). The top end of the support cylinder (902) is also provided with a ventilation component, which is used to enable the support cylinder (902) to communicate with the outside atmosphere when the high-frequency solenoid valve (904) is disconnected.

6. An air-laid machine for uniform web formation according to claim 5, characterized in that The ventilation assembly includes: A vent (10) is provided on the top of the support cylinder (902) near the connecting pipe (903); A variable diameter guide rod (1001) is installed through the vent hole (10). The bottom end of the variable diameter guide rod (1001) is connected to the stop block (906), and its top end extends to the outside of the support cylinder (902). The second spring (1002) is sleeved outside the variable diameter guide rod (1001) and located inside the support cylinder (902). The two ends of the second spring (1002) are fixedly connected to the stop block (906) and the support cylinder (902) respectively.

7. An air-laid machine for uniform web formation according to claim 6, characterized in that The upper diameter of the variable diameter guide rod (1001) is larger than the lower diameter, and the lower diameter of the variable diameter guide rod (1001) is smaller than the diameter of the vent hole (10). The upper diameter of the variable diameter guide rod (1001) is adapted to the diameter of the vent hole (10), and the top of the variable diameter guide rod (1001) is provided with a protrusion larger than the diameter of the vent hole (10).

8. An air-laid machine for uniform web formation according to claim 1, characterized in that The flow guiding channel (7) is provided with a flow equalization and pressure distribution mechanism. The flow equalization and pressure distribution mechanism includes two baffles (11) symmetrically arranged inside the upper flow section. A connecting shaft (1104) is symmetrically arranged at one end of the two baffles (11), and a flow equalization component is provided on the inner side of both baffles (11). A synchronization component is provided between the ends of the two connecting shafts (1104) to drive the two baffles (11) to deflect synchronously.

9. An air-laid machine for uniform web formation according to claim 8, characterized in that The flow equalization component includes multiple elastic flow guide fins (1101) and multiple flow guide grooves (1103) arranged in an array above the side wall of the baffle (11). The root of the elastic guide fin (1101) is fixedly connected to the baffle (11), and its head can be elastically deflected in the direction of fiber airflow. The windward side of the elastic guide fin (1101) is provided with a wedge (1102). The inlet of the flow guide groove (1103) faces the gap between two adjacent sets of elastic flow guide fins (1101), and the groove body of the flow guide groove (1103) is arranged in a right-deep-left-shallow and right-narrow-left-wide pattern along the fiber airflow direction.

10. An air-laid machine for uniform web formation according to claim 8, characterized in that The synchronization component includes: A protective cover (12) is provided on the side wall of the frame (1), and a spiral frame (1201) is slidably connected inside the protective cover (12). The spiral frame (1201) has toothed plates (1202) symmetrically arranged at both ends. One end of each of the two connecting shafts (1104) extends into the protective cover (12) and is provided with gears (1203). The two gears (1203) mesh with the two toothed plates (1202) respectively. An electric push rod (13) is located at one end of the protective cover (12), and the output end of the electric push rod (13) extends into the protective cover (12) and is fixedly connected to the spiral frame (1201).

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