A spraying mechanism of a glass fiber mat surface spraying machine

Abstract

The application provides a spraying mechanism of a glass fiber felt surface spraying machine, which comprises a spraying beam and a plurality of atomizing nozzles installed on the lower side of the spraying beam, and further comprises an atomizing constraint cover; the atomizing constraint cover comprises an installation top plate, the upper side of the installation top plate is installed with the spraying beam, a plurality of nozzle through holes for the atomizing nozzles to pass through are formed on the plate body of the installation top plate; the lower side of the installation top plate is symmetrically provided with two air flow generating boxes in front and back, and two reflux collecting assemblies are symmetrically arranged left and right; the two air flow generating boxes and the two reflux collecting assemblies jointly enclose a spraying cavity with an open lower end; the opposite side walls of the two air flow generating boxes are air curtain plates, the two air curtain plates extend in an eight-shaped manner downward from the installation top plate, the air curtain plates are densely provided with micropores, and the air flow generating boxes are provided with gas inlet interfaces in communication with external gas sources; the lower edge of the reflux collecting assembly is provided with a liquid collecting inclined plate, the liquid collecting inclined plate extends upward and obliquely towards the inside of the spraying cavity, and the reflux collecting assembly is provided with a reflux outlet connected with a recycling system.

Description

Technical Field

[0001] This utility model relates to the field of glass fiber mat production technology, specifically to a spraying mechanism for a glass fiber mat surface spraying machine. Background Technology

[0002] Fiberglass mat is a sheet-like product made by bonding continuous or chopped filaments together in an undirected manner through chemical adhesives or mechanical action. In its production process, the process of spraying adhesive is crucial, as it directly determines the uniformity, strength, and quality of the mat.

[0003] Currently, this process generally involves setting up one or more spray beams above the forming mesh belt, with a row of atomizing nozzles installed on the spray beams to evenly spray liquid binder onto the descending fiber mesh blank. However, this conventional spraying method has several significant drawbacks: 1) The adhesive droplets sprayed from the atomizing nozzle spread in a fan shape. Due to the diffusivity of the droplets, the droplets on the outer edge of the fan-shaped mist flow are easily dispersed and fail to be effectively deposited on the fiber mesh blank. Instead, they drift to the sides of the mesh belt or attach to the wall panels, conveyor rollers, and other devices of the equipment. This not only wastes adhesive material and increases production costs but also contaminates the equipment. In addition, the attached droplets accumulate to form gels, which may fall off and contaminate the final product, resulting in defects. 2) A cutting process is also set after the spraying process to remove the left and right edge portions of the glass fiber mat. This is done to shape the glass fiber mat and remove irregular burrs, and to remove the unevenly sprayed adhesive at the edges. Due to the diffusivity of the droplets, there will be areas where the adhesive gradually thins to nothing at the left and right edges of the glass fiber mat. The cutting process is also to remove this part of the mat with low bonding strength. Therefore, this also leads to the waste of adhesive carried on the removed part, increasing production costs. Utility Model Content

[0004] To address the technical problems existing in the background art, this utility model provides a spraying mechanism for a glass fiber mat surface spraying machine.

[0005] The technical solution of this utility model is as follows: A spraying mechanism for a glass fiber mat surface spraying machine includes a spray beam and several atomizing nozzles installed on its lower side, and also includes an atomizing constraint cover. The atomizing constraint cover includes a horizontally set mounting top plate, a spray beam is installed on the upper side of the mounting top plate, and several nozzle through holes are opened on the plate body for the atomizing nozzles to pass through. Two airflow generating boxes are symmetrically arranged at the front and back on the lower side of the mounting plate, and two return flow collecting components are symmetrically arranged on the left and right; the two airflow generating boxes and the two return flow collecting components together form a spraying cavity with an open lower end; The two airflow generating boxes have opposite side walls that are air curtain panels. The two air curtain panels extend downwards from the mounting top plate in a figure-eight shape. The air curtain panels are densely covered with micropores. The airflow generating boxes are equipped with air inlet interfaces that connect to external air sources. The lower edge of the reflux collection assembly is provided with a liquid collection sloping plate, which extends upwards and inclines into the spraying chamber. The reflux collection assembly is provided with a reflux outlet connected to the recycling system.

[0006] In the above scheme, the tilt angle of the air curtain panel relative to the vertical plane is 20°-50°.

[0007] Furthermore, the aperture of the micropores on the air curtain plate varies vertically.

[0008] Furthermore, the pore size of the micropores on the air curtain plate gradually increases from top to bottom.

[0009] In the above scheme, the inclination angle of the liquid collecting inclined plate relative to the horizontal plane is 15°-45°.

[0010] Furthermore, the top surface of the liquid collecting inclined plate has a hydrophobic coating or is made of a hydrophobic material.

[0011] In the above scheme, the reflux collection component is a hollow box structure, which includes an inner baffle facing the spraying cavity and a liquid collection inclined plate as the bottom plate. The higher side of the liquid collection inclined plate extends laterally into the spraying cavity and exceeds the lower edge of the inner baffle. A liquid collection gap is formed between the lower edge of the inner baffle and the top surface of the liquid collection inclined plate. The reflux outlet is opened on the outer wall of the reflux collection component facing away from the spraying cavity.

[0012] Furthermore, the upper part of the inner baffle is provided with several ventilation openings that connect to the spraying chamber.

[0013] Furthermore, the ventilation port extends from the inner cavity of the reflux collection assembly into the inner side of the spraying cavity and slopes downward.

[0014] In the above scheme, the cross-section of the liquid collecting inclined plate as a whole or near the upper edge is wedge-shaped, with its higher edge being the tip of the wedge.

[0015] The present invention provides a spraying mechanism for a glass fiber mat surface spraying machine. Through the constraint of the "eight"-shaped air curtain plates on both sides, the atomized flow is effectively limited within the target spraying width. At the same time, through the precise interception and recovery of the edge of the mist flow by the liquid collection inclined plate, the adhesive that drifts outside the fiber mat range in the traditional process is effectively collected and returned to the recovery system, which greatly reduces the waste of adhesive and significantly reduces production costs. Attached Figure Description

[0016] In the attached diagram: Figure 1 This is a three-dimensional schematic diagram of the spraying mechanism; Figure 2 This is a schematic diagram of the front side of the spraying mechanism; Figure 3 for Figure 2 Schematic diagram of the cross section of AA; Figure 4 for Figure 3 Schematic diagram of cross section of BB.

[0017] The components represented by the various reference numerals in the diagram are: 1. Spray beam; 2. Atomizing nozzle; 3. Atomizing constraint cover; 4. Mounting top plate; 5. Nozzle through hole; 6. Airflow generating box; 7. Return collection assembly; 8. Spraying chamber; 9. Air curtain plate; 10. Micropores; 11. Air inlet; 12. Inner baffle; 13. Liquid collection inclined plate; 14. Liquid collection gap; 15. Return outlet; 16. Ventilation port. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. These embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0019] This utility model provides a spraying mechanism for a glass fiber mat surface spraying machine, the core of which is the addition of an atomizing constraint hood. This hood can effectively constrain the diffusion of the adhesive mist, significantly improving the material utilization rate.

[0020] See Figures 1 to 4 The spraying mechanism includes a spray beam 1 extending laterally to the left and right. The spray beam 1 is typically a hollow tubular structure used to transport liquid binder. Several atomizing nozzles 2 are fixedly installed on the lower side of the spray beam 1 via threaded connections. These atomizing nozzles 2 are evenly arranged along the axial direction of the spray beam 1. The atomizing nozzles 2 are preferably air atomization type, which can atomize the high-pressure liquid binder into fine particles.

[0021] The spraying mechanism also includes an atomizing constraint hood 3, which includes a horizontally mounted top plate 4. The top plate 4 is preferably made of 5-10mm thick stainless steel, providing sufficient rigidity and corrosion resistance. The top plate 4 is fixedly mounted above the forming mesh belt of the fiberglass mat production line using brackets (not shown in the figure). The spray beam 1 is mounted on the upper surface of the top plate 4 using U-shaped clamps or bolts. A nozzle through-hole 5 is machined on the top plate 4 corresponding to the position of each atomizing nozzle 2. The diameter of the nozzle through-hole 5 is slightly larger than the outer diameter of the atomizing nozzle 2, ensuring that the nozzle can pass through smoothly and leaving appropriate installation and thermal expansion clearance.

[0022] On the underside of the mounting top plate 4, two airflow generating boxes 6 are symmetrically fixed front to back and two return flow collecting components 7 are symmetrically fixed left to right by bolts. The two airflow generating boxes 6 and the two return flow collecting components 7 are connected end to end, together forming a rectangular spraying cavity 8 with an open bottom below the mounting top plate 4. The glass fiber felt blank to be sprayed passes directly below the spraying cavity 8, with the lower end of the atomizing nozzle 2 exposed inside the spraying cavity 8.

[0023] The airflow generating box 6 is made of aluminum alloy profile; it is long and narrow, extending laterally in the left-right direction. For example... Figure 3 As shown, the sidewalls of the airflow generating boxes 6 facing the inner side of the spraying cavity 8 (i.e., the opposing sidewalls of the two airflow generating boxes 6) directly serve as air curtain plates 9. The two air curtain plates 9 extend downwards from the mounting top plate 4 in a figure-eight shape. The tilt angle α of the air curtain plates 9 relative to the vertical plane is 20°-50°; in this embodiment, angle α is preferably 30°. This angle design allows the ejected airflow to effectively converge the droplets towards the center. The air curtain plates 9 are densely covered with numerous micropores 10, with diameters ranging from 1mm to 3mm. Through the dense micropores 10 and the pressure difference between the inner and outer sides of the air curtain plates 9, the airflow generating boxes 6 generate a continuous airflow into the spraying cavity 8, continuously forming a gas isolation layer (air curtain) on the outer surface of the air curtain plates 9. This prevents droplets from contacting the air curtain plates 9, effectively constraining the diffusion of the adhesive mist in the forward and backward directions.

[0024] The airflow generating chamber 6 has an internal cavity that acts as a pressure stabilizer, ensuring that compressed air is evenly distributed across the entire back of the air curtain plate 9 and uniformly ejected from all the micro-holes 10, forming two stable and uniform air curtains. The functions of these two air curtains are twofold: first, to act as an isolation layer to prevent droplets from approaching; and second, to blow the diffused droplets towards the central airflow, effectively constraining the diffusion range of the atomized binder.

[0025] To further optimize airflow distribution, the aperture of the micropores 10 in this embodiment is designed to vary vertically, specifically by gradually increasing from top to bottom. For example, the upper aperture is 1 mm, while the lower aperture increases to 3 mm. This design increases the airflow at the lower part of the air curtain plate 9 relative to the upper part, which improves the effect of confining the mist flow, addressing the issue that the fan-shaped mist sprayed from the atomizing nozzle 2 tends to disperse more severely towards the bottom.

[0026] Each airflow generating box 6 has an air inlet 11 at its upper part, which is connected to an external compressed air source via a high-pressure hose. Multiple air inlets 11 can be provided and arranged in a left-right direction.

[0027] In addition, in some other embodiments, several flow dividers may be further provided in the airflow generating box 6. The flow dividers are located between the air curtain plate 9 and the air inlet 11, dividing the cavity in the airflow generating box 6 into several airflow channels to ensure that the airflow is evenly distributed to the air curtain plate 9.

[0028] The reflux collection assembly 7 is a hollow box structure, injection molded from corrosion-resistant polypropylene plastic, and is detachably located on the left and right sides of the airflow generating box 6.

[0029] like Figure 4 As shown, the reflux collection assembly 7 includes an inner baffle 12 facing the spraying cavity 8 and a liquid collecting inclined plate 13 serving as a base plate. The liquid collecting inclined plate 13 extends upward and inclined towards the interior of the spraying cavity 8, with an inclination angle β relative to the horizontal plane of 15°-45°. In this embodiment, the inclination angle β is preferably 30°, which ensures that the captured droplets can be smoothly guided to the collection point under the action of gravity. In order to efficiently guide the flow and prevent droplet retention, the top surface of the liquid collecting inclined plate 13 is coated with a Teflon (PTFE) hydrophobic coating, or the liquid collecting inclined plate 13 is made of a hydrophobic material.

[0030] The higher side of the liquid collecting inclined plate 13 (the side closer to the center of the spraying cavity 8) extends laterally into the spraying cavity 8 and beyond the lower edge of the inner baffle 12, forming a long strip-shaped liquid collecting gap 14 between the lower edge of the inner baffle 12 and the top surface of the liquid collecting inclined plate 13.

[0031] The inner baffle 12 is used to restrict and block the fog flow from the left and right sides to drift outward. When the fog droplets touch the inner baffle 12, they adhere to the inner baffle 12, accumulate into liquid flow, and then flow downward to the liquid collection inclined plate 13.

[0032] The design of the liquid collecting inclined plate 13 extending beyond the inner baffle 12 serves two purposes: first, to collect the adhesive flowing down from the inner baffle 12; and second, to intercept and recover droplets or mist from the ineffective spraying locations on the left and right sides of the glass fiber felt blank. In traditional spraying methods, due to the drifting nature of the droplets, areas gradually decreasing towards the edges until no adhesive is left on the left and right sides of the glass fiber felt blank are formed, resulting in wasted adhesive. The liquid collecting inclined plate 13 of this invention intercepts the droplets in these areas, preventing them from drifting downwards. Instead, they contact the inner baffle 12 and / or the top surface of the liquid collecting inclined plate 13 and are collected, thereby reducing adhesive waste and lowering costs.

[0033] It should be noted that the purpose of the liquid collecting inclined plate 13 of this utility model is not to absolutely avoid the generation of ineffective spraying areas on the left and right sides of the glass fiber felt blank, but to minimize the amount of droplets drifting to the ineffective spraying area and reduce the waste of adhesive, rather than to absolutely avoid waste.

[0034] The reflux collection assembly 7 has a reflux outlet 15 on the lower part of its outer side wall facing away from the spraying chamber 8. The reflux outlet 15 is connected to the recovery system through a pipe to collect the adhesive liquid collected on the liquid collecting inclined plate 13. The lower edge of the reflux outlet 15 abuts against the upper part of the liquid collecting inclined plate 13.

[0035] To prevent the high-speed spraying action of the atomizing nozzle 2 from generating harmful gas vortices (eddies) in the space above the liquid collection ramp 13, which would interfere with the stability of the main spray flow at both ends of the spraying chamber 8, affect the effective deposition of the adhesive at the edge of the fiberglass mat, and potentially re-entrain the trapped droplets into the airflow, causing secondary dispersion, this embodiment provides several ventilation openings 16 on the upper part of the inner baffle 12. These ventilation openings 16 can be round holes or elongated holes, extending from the inner cavity of the return collection assembly 7 into the inner side of the spraying chamber 8 and sloping downwards.

[0036] The high-speed sprayed mist will entrain a large amount of surrounding air, easily forming a local low pressure in the area above the liquid collection inclined plate 13 and near the upper part of the inner baffle 12. The ventilation port 16 provides a low-resistance supplementary channel for the air in the return collection component 7, allowing the air in the return collection component 7 to flow into the spraying cavity 8 to balance the pressure in the low-pressure area, creating a more stable boundary environment for the main spray flow and suppressing random air entrainment and eddy current generation.

[0037] In addition, after the air in the reflux collection component 7 flows into the spraying chamber 8, a negative pressure is generated in the reflux collection component 7, which in turn generates suction at the liquid collection gap 14, which helps to draw the droplets into the inner cavity of the reflux collection component 7.

[0038] In addition, the downward tilt of the ventilation port 16 guides the airflow in the ventilation port 16 downward, which helps to "blow" the droplets toward the liquid collection plate 13, playing an auxiliary role in collection and transportation, and further improving the recycling efficiency of the binder.

[0039] This invention utilizes the spraying action of the nozzle as power to carry air downwards at an angle. Through the placement of the air exchange port 16 and the liquid collection gap 14, a controlled, low-disturbance airflow circulation pattern is formed on both sides of the inner baffle 12, replacing the previously uncontrollable and harmful turbulent flow. This not only significantly reduces interference with the main spraying process and ensures the spraying quality of the felt edge area, but also optimizes the adhesive collection effect through the auxiliary transport of the airflow.

[0040] Furthermore, the cross-section of the liquid collecting inclined plate 13, either as a whole or near its upper edge, is wedge-shaped, such as... Figure 4 As shown, this design creates a sharp edge at its highest point, similar to a knife blade. This wedge-shaped tip design minimizes obstruction to the spray flow while efficiently breaking down and trapping droplets that impact it.

[0041] During operation, compressed air enters the airflow generating box 6 through the air inlet 11, and is then evenly sprayed out from the micro-holes 10 of the air curtain plate 9, forming two dense, stable, and inclined air curtains. These air curtains act as an invisible barrier, preventing droplets from spreading forward and backward and causing them to converge towards the center. Furthermore, the airflow forms an isolation layer on the surface of the air curtain plate, effectively preventing droplets from adhering to the cover. The fan-shaped mist sprayed from the atomizing nozzle 2 is confined between these two air curtains. The edges of the mist spreading to the left and right sides collide with the liquid collecting inclined plate 13 and are intercepted. Droplets rapidly converge into streams on the hydrophobic surface, flowing through the liquid collecting gap 14 into the box of the return collection assembly 7, and finally flowing from the return outlet 15 to the recycling system for reuse or centralized treatment. This achieves multiple objectives: reducing overspray, saving raw materials, improving the effective coating of the felt surface, and improving the working environment.

Claims

1. A spraying mechanism for a glass fiber mat surface spraying machine, comprising a spray beam (1) and a plurality of atomizing nozzles (2) mounted on its lower side, characterized in that, It also includes a fogging constraint cover (3); The atomizing constraint cover (3) includes a horizontally arranged mounting top plate (4), and a spray beam (1) is installed on the upper side of the mounting top plate (4). Several nozzle through holes (5) are opened on the plate body for the atomizing nozzles (2) to pass through. Two airflow generating boxes (6) are symmetrically arranged on the lower side of the mounting plate (4), and two return flow collecting components (7) are symmetrically arranged on the left and right sides; the two airflow generating boxes (6) and the two return flow collecting components (7) together form a spraying cavity (8) with an open lower end. The two airflow generating boxes (6) have opposite side walls that are air curtain plates (9). The two air curtain plates (9) extend downward from the mounting top plate (4) in a figure-eight shape. The air curtain plates (9) are densely covered with micropores (10). The airflow generating box (6) is provided with an air inlet (11) that connects to an external air source. The lower edge of the reflux collection assembly (7) is provided with a liquid collection sloping plate (13), which extends upward and tilts into the spraying cavity (8). The reflux collection assembly (7) is provided with a reflux outlet (15) connected to the recycling system.

2. The spraying mechanism of the glass fiber mat surface spraying machine as described in claim 1, characterized in that, The air curtain panel (9) is tilted at an angle of 20°-50° relative to the vertical plane.

3. The spraying mechanism of a glass fiber mat surface spraying machine as described in claim 2, characterized in that, The aperture of the micropores (10) on the air curtain plate (9) varies vertically.

4. The spraying mechanism of the glass fiber mat surface spraying machine as described in claim 3, characterized in that, The aperture of the micropores (10) on the air curtain plate (9) gradually increases from top to bottom.

5. The spraying mechanism of a glass fiber mat surface spraying machine as described in claim 1, characterized in that, The angle of inclination of the liquid collecting inclined plate (13) relative to the horizontal plane is 15°-45°.

6. The spraying mechanism of a glass fiber mat surface spraying machine as described in claim 5, characterized in that, The top surface of the liquid collecting inclined plate (13) has a hydrophobic coating or is made of a hydrophobic material.

7. The spraying mechanism of a glass fiber mat surface spraying machine as described in claim 1, characterized in that, The reflux collection assembly (7) is a hollow box structure, which includes an inner baffle (12) facing the spraying cavity (8) and a liquid collection inclined plate (13) as the bottom plate. The higher side of the liquid collection inclined plate (13) extends laterally into the spraying cavity (8) and extends beyond the lower edge of the inner baffle (12). A liquid collection gap (14) is formed between the lower edge of the inner baffle (12) and the top surface of the liquid collection inclined plate (13). The reflux outlet (15) is opened on the outer wall of the reflux collection assembly (7) facing away from the spraying cavity (8).

8. The spraying mechanism of a glass fiber mat surface spraying machine as described in claim 7, characterized in that, The upper part of the inner baffle (12) is provided with several ventilation openings (16) that connect to the spraying cavity (8).

9. The spraying mechanism of a glass fiber mat surface spraying machine as described in claim 8, characterized in that, The ventilation port (16) extends from the inner cavity of the return collection assembly (7) into the inner side of the spraying cavity (8) and slopes downward.

10. The spraying mechanism of a glass fiber mat surface spraying machine as described in claim 1, characterized in that, The cross-section of the liquid collecting inclined plate (13) as a whole or near the upper edge is wedge-shaped, with its higher edge being the tip of the wedge.

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