Core for Winding of Tight-Winding Polishing Wheel and Curing Process of Tight-Winding Polishing Wheel

Abstract

The present invention discloses a core for winding a wound polishing wheel and a curing process for a wound polishing wheel, which are used for winding a coated non-woven fabric substrate. The core is a hollow tubular structure formed by winding a glass fiber mesh cloth impregnated with a thermosetting resin, and its porosity is 30%-70%. One end of the core is closed, and the other end is connected to a negative pressure extraction pipe. The present invention also provides a curing process using the core and a slurry system for non-woven fabric coating, which solves the problem of a large amount of emissions caused by the extensive use of organic solvents as diluents in the existing wound wheel process. Moreover, the abrasion resistance of the polished wheel product is excellent. At the same time, the production method in the present invention shortens the required curing process time to one-third of the original, and reduces the energy consumption to less than 20% of the original.

Description

Technical Field

[0001] The present invention relates to a winding device, in particular to a core for winding a tightly wound polishing wheel and a curing process for a tightly wound polishing wheel. Background Art

[0002] The winding wheel belongs to the elastic abrasive in the branch of abrasive tools and is a kind of nylon wheel or polishing wheel. Compared with the fiber polishing wheel products mass-produced in China, the winding wheel has a higher density, and its durability is 2-8 times that of the laminated fiber polishing wheel, and the processing surface effect is more stable. This unique product feature of the winding wheel makes it play an irreplaceable role in the fields of metal processing, deburring, and finishing. It is widely used in various fields such as engine blades, sports equipment, medical devices, mechanical shaft parts, and household hardware.

[0003] The winding wheel is coated by the method of roller gluing with industrial nylon fiber non-woven fabric and scouring pad, and then wound into a rod on a special tube core and baked and cured. The coating colloid contains binders, abrasives, fillers, and various additives, etc., and the sizes of the wound rods are various models from 150mm to 600mm. Due to the differences in the colloid composition and the process, there are also huge differences in the performance of the finished winding wheels. Currently, there are mainly two major winding wheel formulation systems in the world. European and American countries are currently the mainstream suppliers of global winding wheel products, with a global market share of more than 80%. They widely use a non-environmental polyurethane formulation system. Its advantages are good product performance, durability, and elasticity. The disadvantages are VOC emissions, long curing time, and for some large-size and high-density products, the curing time even requires baking at 130 degrees for more than 36-48 hours. The other system is the domestic non-environmental epoxy toughening system. Its advantages are low cost, strong cutting force of the product, and short curing time. The disadvantages are poor product durability, generally only 1 / 4 or even lower than that of the polyurethane system, high product hardness, much worse grinding effect and use experience, and there are also problems such as VOC emissions.

[0004] For different technical routes, the current product processes all have certain difficulties or disadvantages: (1) For the differences in the winding rod density and size of the polyurethane system, it leads to a complex curing process, long process, high energy consumption, or insufficient curing, and a large amount of VOC emissions. (2) For the epoxy system winding wheels, currently due to the limitations of their performance, there is no very significant breakthrough in durability and elasticity. At the same time, there are also VOC emission problems, and because the reaction activity of the amine curing agent in the epoxy system is different at different climate temperatures, the performance of the finished product also fluctuates with the temperature. Summary of the Invention

[0005] The object of the present invention is to solve the deficiencies of the above-mentioned prior art. In view of the problems existing in the traditional winding wheel, a core for winding a winding type polishing wheel for winding a coated non-woven fabric substrate and a curing process for the winding type polishing wheel are proposed. Through the combination of the new structure and the new process, the deficiencies of the prior art are effectively solved.

[0006] To achieve the above object of the invention, the present invention adopts the following technical solutions:

[0007] The present invention provides a core for winding a winding type polishing wheel for winding a coated non-woven fabric substrate. The core is a hollow tubular structure formed by winding a glass fiber mesh cloth impregnated with a thermosetting resin, and its porosity is 30%-70%.

[0008] Further, one end of the core is closed, and the other end is connected to a negative pressure extraction pipe.

[0009] Further, a cylindrical ventilation device coaxial with the core is arranged in the hollow chamber of the core, and a radial gap is left between the ventilation device and the inner side of the core. The ventilation device includes a first cylinder coaxial with the core, and the middle side of the first cylinder is evenly provided with first air inlet holes. One end of the first cylinder is used as an air inlet end to introduce high-speed air flow, and the other end is used as an air outlet end to discharge high-speed air flow.

[0010] Further, the ventilation device further includes a self-sealing assembly. The self-sealing assembly includes elastic sealing rings sleeved at both ends of the first cylinder and a sealing ring group for fixing the elastic sealing rings. The inner side of the elastic sealing ring has a thrust inclined surface;

[0011] The sealing ring group includes:

[0012] A fixing ring, which is arranged between the middle side of the first cylinder and the end of the first cylinder and protrudes radially outward from the first cylinder; and between the fixing ring and the end of the first cylinder, movable grooves are evenly opened along the circumferential direction of the first cylinder;

[0013] A moving ring, which is assembled at the end of the first cylinder and forms an annular cavity for accommodating the elastic sealing ring with the fixing ring;

[0014] An extrusion ring, which is embedded between the elastic sealing ring and the first cylinder and can axially slide in the annular cavity, and the outer side of the extrusion ring forms an inclined surface pair with the thrust inclined surface of the elastic sealing ring;

[0015] A bottomed and lidless thrust cylinder is arranged at the air inlet end. The bottom plate of the thrust cylinder is provided with air inlet holes along the air inlet direction. A limiting platform is arranged corresponding to the thrust cylinder on the inner side of the first cylinder, and a return spring is arranged between the thrust cylinder and the limiting platform;

[0016] A driven cylinder is arranged inside the air outlet end, and the driven cylinder is linked with the thrust cylinder;

[0017] Both between the extrusion ring and the thrust cylinder and between the extrusion ring and the driven cylinder are fixedly connected through connecting pieces penetrating the movable slots.

[0018] Further, the ventilation device further includes a second cylinder assembly, and the second cylinder assembly includes:

[0019] A second cylinder, coaxially fixed inside the first cylinder and axially located behind the thrust cylinder; a support plate for fixing the second cylinder is radially and uniformly arranged in the annular space between the second cylinder and the first cylinder, and a second air guiding hole communicating the inner cavity of the second cylinder with the outside of the first cylinder penetrates through the support plate; the rear end of the second cylinder is communicated with a negative pressure exhaust fan;

[0020] A connecting shaft, passing through the second cylinder along the axial direction, one end of the connecting shaft is connected to the thrust cylinder, and the other end of the connecting shaft is connected to the driven cylinder;

[0021] A sleeve, arranged at the center of the driven cylinder and connected to the driven cylinder through a radially arranged connecting rod, and the sleeve is used for assembling the end of the connecting shaft; the connecting rod passes through the second cylinder, and a sealing lining plate slidably matched with the side surface of the second cylinder is arranged on the connecting rod.

[0022] The present invention also provides a curing process based on the above-mentioned core for winding a wound polishing wheel, which specifically includes the following steps:

[0023] (1) Wind the non-woven fabric coated with slurry on the core;

[0024] (2) Seal one end of the core, connect the other end of the core to the negative pressure exhaust pipe of the oven to draw negative pressure, remove moisture through the oven and circulate it to the outside of the core for hot air circulation curing.

[0025] The present invention also provides another curing process based on the above-mentioned core for winding a wound polishing wheel, which specifically includes the following steps:

[0026] (1) Wind the non-woven fabric coated with slurry on the core;

[0027] (2) Insert the ventilation device into the hollow chamber of the core, connect the second cylinder to the negative pressure exhaust fan of the oven, use the induced draft fan to introduce the air inlet pipe into the core, threadedly connect it to the air inlet end of the first cylinder in the core, and lead the end of the first cylinder into the air inlet of the oven. The oven is used to remove the moisture of the gas and then discharge it to the outside of the core;

[0028] (3) Start the negative pressure exhaust fan and induced draft fan of the oven, suck the dry gas outside the core through the pores of the core into the first cylinder and the second cylinder, and send it into the oven. After quickly removing the moisture, it is discharged to the outside of the core to form a hot air circulation curing effect.

[0029] Further, the slurry coated on the non-woven fabric includes hard glue, soft glue, abrasive, filler and additives, wherein:

[0030] The hard glue is an aqueous liquid phenolic resin accounting for 5%-20% of the mass fraction of the slurry, the soft glue is at least one of an aqueous polyurethane emulsion, an aqueous butadiene acrylonitrile emulsion, and an aqueous acrylic emulsion accounting for 10%-40% of the mass fraction of the slurry, and the abrasive accounts for 30%-65% of the mass fraction of the slurry.

[0031] Further, the filler is at least one of calcium carbonate, spodumene, and aluminum hydroxide.

[0032] Further, the additives are at least one of pigments, color pastes, anti-settling agents, co-solvents, grinding aids, heat-absorbing aids, and stearic acid.

[0033] Compared with the prior art, the above one or more technical solutions have the following beneficial effects:

[0034] The present invention provides a core for winding a wound polishing wheel, the internal porosity of which is 30%-70%, which can perform hot air circulation by means of a negative pressure device and a ventilation device, quickly remove moisture, and thus cure the product. This curing method, compared with the existing curing process of fiberglass pultruded pipes, has a moisture removal effect increased by more than 5 times and a curing time shortened by more than 3 times.

[0035] The present invention also simultaneously provides a new type of aqueous compound glue system for preparing the coating slurry for polishing products, especially for processing wound polishing wheels, and is beneficial to reducing VOC emissions, solving the problem of a large amount of emissions caused by the extensive use of organic solvents as diluents in the existing wound wheel process. At the same time, its wear resistance reaches the leading level in the industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The specification drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention.

[0037] Figure 1 It is a schematic diagram of the winding and curing process in the prior art.

[0038] Figure 2 It is a schematic diagram of the winding and curing process in the present invention.

[0039] Figure 3 It is an assembly drawing of the curing process in an embodiment of the present invention.

[0040] Figure 4 It is an exploded view of the structure of a ventilation device in an embodiment of the present invention.

[0041] Figure 5 It is a partial schematic view of the air inlet end of the ventilation device in the present invention

[0042] Figure 6 It is a front view of the winding and curing process in an embodiment of the present invention.

[0043] Figure 7 is Figure 6 a schematic cross-sectional structure view of the fiber cloth in

[0044] Figure 8 It is a schematic cross-sectional structure view of the ventilation device with a second cylinder in the present invention.

[0045] Figure 9 is Figure 8 a side view of the ventilation device in

[0046] Figure 10 is Figure 8 a schematic view of the air flow direction of the ventilation device in

[0047] In the figure:

[0048] 100, fiber cloth; 200, core; 300, ventilation device;

[0049] 310, first cylinder; 311, first air inlet hole; 312, fixed ring; 313, moving ring; 314, limiting platform; 315, activity groove; 316, air inlet end; 317, air outlet end;

[0050] 320, elastic sealing ring;

[0051] 330, extrusion ring;

[0052] 340, thrust cylinder; 341, air inlet hole;

[0053] 350, second cylinder; 351, connecting shaft; 352, sealing lining plate; 353, support plate; 354, second air inlet hole;

[0054] 360, driven cylinder; 361, sleeve; 362, connecting rod. Detailed implementation manners

[0055] The present invention will be further described below in conjunction with the drawings and embodiments.

[0056] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs.

[0057] It should be noted that the terms used herein are merely for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they specify the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0058] In the present invention, the fibrous non-woven fabric uses polyamide staple fibers. According to different proportions, it is carded by a carding machine, cross-laid, and formed by Rando air-laying. After the laid non-woven fabric is roll-coated with aqueous glue and then dried and cured in a tunnel furnace, the required fibrous non-woven fabric is obtained.

[0059] The polyamide fiber refers to polyamide monofilament 6 or polyamide bifilament 6; the fiber fineness is 15 denier, 30 denier, 50 denier, 70 denier and other different fineness fibers, and the length of a single fiber is 40 mm - 70 mm.

[0060] The aqueous glue includes aqueous polyurethane glue, aqueous acrylic glue, aqueous nitrile latex, aqueous phenolic glue, etc.

[0061] The fibrous non-woven fabric weighs 120 - 350 grams per square meter and has a thickness of 8 - 15 mm.

[0062] Example 1

[0063] Take 15-denier nylon staple fibers (Invista nylon bifilament 6) with a length of 40 mm. After carding, laying, and air-laying, a uniform non-woven fabric substrate with a weight of 180 grams per square meter and a thickness of 15 mm is obtained. Roll-coat 50 grams of dry aqueous polyurethane glue, model Alberdingk U7640, with a solid content of 39 - 41%. The coating formula is: 60% polyurethane emulsion, 40% water. After coating and drying, the finished fiber web is obtained, with a weight of 230 grams per square meter.

[0064] Slurry formula: 15% aqueous liquid phenolic resin, 35% aqueous polyurethane emulsion U7640, 40% primary silicon carbide abrasive P180, 5% calcium carbonate (filler), 2% stearic acid (auxiliary agent). Stir evenly to prepare a slurry with a viscosity of about 8000 cps. Through the double-roll extrusion coating process, 1200 grams of wet glue is coated per square meter.

[0065] Wind the coated non-woven fabric of about 18 meters around the pre-fabricated core 200 with an outer diameter of 90 mm and an inner hole of 76 mm to form a winding wheel. The core 200 is made by winding after impregnating thermosetting resin and fiberglass mesh cloth, with a porosity of 30 - 70%. Through a winding rod machine, wind the 18-meter cloth evenly into a rod with an outer diameter of 230 mm, and place it in a curing box. At a temperature of 90 - 150 degrees, as Figure 2 shown, evacuate the negative pressure inside the core 200, and the hot air passes through the winding wheel from the curing box and enters the core 200, then is sent to a circulation fan, and the continuous curing time is 5 - 8 hours.

[0066] For the cured rod, grind the outer circle to an outer diameter of 203 mm, and then cut it into finished winding wheels with different thicknesses. The appearance of the finished product is intact, the curing is consistent inside and outside, and the hardness is moderate. Measure the roughness Ra to be 0.1 micron, the hardness is Shore A 88 degrees, test the abrasion resistance of the winding wheel under a pressure of 6 kg, and the cutting / wear ratio is between 400 - 800%, which is comparable to imported products.

[0067] Example 2

[0068] Take 40 mm long 30 denier nylon staple fibers (Invista nylon 66 fibers), and after carding, web laying, and air laying, obtain a uniform non-woven fabric substrate with a weight of 180 g / m² and a thickness of 15 mm. Roll coat 50 g of dry water-based polyurethane glue, model Alberdingk U7640, with a solid content of 39 - 41%. The coating formula is: 60% polyurethane emulsion, 40% water. After coating and drying, obtain the finished fiber web with a weight of 230 g / m².

[0069] Slurry formula: 20% water-based liquid phenolic resin, 32% water-based nitrile latex LITEN NX1200 (produced by Synthomer), 40% first-grade silicon carbide abrasive P80, 5% calcium carbonate (filler), 3% stearic acid (auxiliary agent). Stir evenly to prepare a slurry with a viscosity of about 6000 cps. Through the double-roll extrusion coating process, coat 1400 g of wet glue per square meter.

[0070] Manufacturing process: Wind the coated non-woven fabric of about 35 meters around the pre-fabricated core 200 with an outer diameter of 145 mm and an inner hole of 127 mm to form a winding wheel. Through a winding rod machine, wind the 35-meter cloth evenly into a rod with an outer diameter of 330 mm, and place it in a curing box. At a temperature of 90 - 150 degrees, as Figure 2 shown, evacuate the negative pressure inside the core 200, and the hot air passes through the winding wheel from the curing box and enters the core 200, then is sent to a circulation fan, and the continuous curing time is 6 - 9 hours.

[0071] The solidified rod is ground on the outer circle to an outer diameter of 305 mm, and then cut into finished winding wheels with different thicknesses. The appearance of the finished product is intact, the solidification is consistent inside and outside, and the hardness is moderate. The measured roughness Ra is 0.25 microns, and the hardness is Shore A 90 degrees. The wear resistance of the winding wheel is tested under a pressure of 6 kg, and the cutting / loss ratio is between 300-600%, which is comparable to imported products.

[0072] Example 3

[0073] 65 mm long 15 denier nylon staple fiber (Invista nylon 66 fiber), after carding, web laying, and air-laying, a uniform non-woven fabric substrate with a weight of 140 g / m² is obtained, with a thickness of 15 mm. 50 g of dry water-based phenolic glue, model Alberdingk U6150, with a solid content of 39-41% is roll-coated. The coating formula is 60% polyurethane emulsion and 40% water. After coating and drying, the finished fiber web with a weight of 230 g / m² is obtained.

[0074] Slurry formula: 12% water-based liquid phenolic resin, 39% water-based acrylic emulsion, 45% first-grade silicon carbide abrasive P120, 2.5% zinc stearate, 1.5% titanium dioxide. Stir evenly to prepare a slurry with a viscosity of about 6000 cps. Through the double-roll extrusion coating process, 1400 g of wet glue is coated per square meter.

[0075] Manufacturing process: The coated non-woven fabric of about 13 meters is wound around the previously made core 200 with an outer diameter of 38 mm and an inner hole of 25.4 mm to form a winding wheel. Through the winding rod machine, the 13-meter cloth is evenly wound into a rod with an outer diameter of 330 mm, and then placed in a curing box. At a temperature of 90-150 degrees, the ventilation device 300 is placed inside the core 200. The hot air passes through the winding wheel from the curing box, enters the core 200 and is discharged by the ventilation device 300, and then sent to the circulation fan. The continuous curing time is 5-7 hours.

[0076] The solidified rod is ground on the outer circle to an outer diameter of 152 mm, and then cut into finished winding wheels with different thicknesses. The appearance of the finished product is intact, the solidification is consistent inside and outside, and the hardness is moderate. The measured roughness Ra is 0.19 microns, and the hardness is Shore A 90 degrees. The wear resistance of the winding wheel is tested under a pressure of 6 kg, and the cutting / loss ratio is between 300-600%, which is comparable to imported products.

[0077] In some other embodiments of the present invention, in the slurry formulation, the aqueous liquid phenolic resin is 5%-20%, the aqueous polyurethane emulsion is 10%-40%, and the hard glue and soft glue can adjust the elasticity of the product by changing the ratio. The first-grade silicon carbide abrasive P120 is 30%-65% (the abrasive can also be brown fused alumina, white fused alumina, zirconium corundum, garnet, emery, ceramic corundum, diamond), the filler is zinc stearate 2.5% (the filler can also be calcium carbonate, spodumene, aluminum hydroxide), and the additive is titanium dioxide 1.5% (the additive can also be other pigments, color pastes, anti-settling agents, co-solvents, grinding aids). The mass fractions of the above raw materials total 100%. Stir the above slurry raw materials evenly to prepare a slurry with a viscosity of about 6000 cps. Through the double-roll extrusion coating process, 1400 grams of wet glue is coated per square meter.

[0078] To accelerate the hot air circulation efficiency and improve the curing speed, as Figures 2 - 7 shown, in the present invention, a ventilation device 300 for accelerating hot air circulation is provided in the core 200 of the above-mentioned embodiment three. The ventilation device 300 includes a first cylinder body 310 coaxially fixed in the core 200, and a first air intake hole 311 is evenly opened on the central side surface of the first cylinder body 310. One end of the first cylinder body 310 serves as an air inlet end 316 to introduce high-speed air flow, and the high-speed air flow flows out at the other end as an air outlet end 317. According to Bernoulli's principle, since the air flow speed in the core 200 is fast and the pressure is small, it can accelerate the gas outside the non-woven fabric 100 to pass through the winding area of the non-woven fabric 100, improve the air pressure difference inside and outside the core 200, and accelerate the hot air circulation speed. As Figure 1 shown, it is the existing winding and curing process of fiberglass pultruded pipe, which can only be cured from the outside of the winding wheel to the inside by heat diffusion, and the curing efficiency is low. However, by adopting the curing process as Figure 2 shown, the curing efficiency is greatly improved through hot air circulation.

[0079] In the above solution, in order to ensure the improvement of the above-mentioned hot air circulation efficiency, a sealed environment is formed between the first cylinder body 310 and the core 200, so that only the hot air flowing from the outside of the non-woven fabric 100 to the first cylinder body 100 can flow out of the first cylinder body 310, and the gas that does not participate in curing entering from both ends of the core 200 is avoided. The ventilation device 300 further includes a self-sealing component. The self-sealing component includes elastic sealing rings 320 sleeved on both ends of the first cylinder body 310, and a sealing ring group for fixing the elastic sealing rings 320. The inner side of the elastic sealing rings 320 has a thrust inclined surface;

[0080] The sealing ring group includes:

[0081] A fixed ring 312 is disposed between the central side surface of the first cylinder 310 and the end of the first cylinder 310, and protrudes radially outward from the first cylinder 310; and between the fixed ring 312 and the end of the first cylinder 310, movable slots 315 are evenly opened along the circumferential direction of the first cylinder 310;

[0082] A movable ring 313 is assembled at the end of the first cylinder 310 and forms an annular cavity for accommodating the elastic sealing ring 320 with the fixed ring 312;

[0083] An extrusion ring 330 is embedded between the elastic sealing ring 320 and the first cylinder 310, and can axially slide in the annular cavity, and the outer side surface of the extrusion ring 330 forms an inclined plane pair with the thrust inclined plane of the elastic sealing ring 320;

[0084] A bottomed and lidless thrust cylinder 340 is arranged in the air inlet end 316. An air inlet hole 341 is opened along the air inlet direction on the bottom plate of the thrust cylinder 340. A limiting platform 314 is arranged on the inner side of the first cylinder 310 corresponding to the thrust cylinder 340, and a return spring 342 is arranged between the thrust cylinder 340 and the limiting platform 314;

[0085] A driven cylinder 360 is arranged in the air outlet end 317, and the driven cylinder 360 is linked with the thrust cylinder 340;

[0086] Both between the extrusion ring 330 and the thrust cylinder 340, and between the extrusion ring 330 and the driven cylinder 360 are fixedly connected by a connecting member passing through the movable slot 315.

[0087] In the above structure, the connecting member passing through the movable slot 315 is, for example, a screw. As Figure 8 shown, the screw passes through the movable slot 315 from the extrusion ring 330 and is connected to the thrust cylinder 340. Thus, when the thrust cylinder 340 slides under the impact of the airflow at the end of the first cylinder 310, it can synchronously drive the extrusion ring 330 to move in the annular cavity and extrude the thrust inclined plane on the inner side of the elastic sealing ring 320, so that the elastic sealing ring 320 expands slightly, thereby tightly pressing against the inner side surface of the core 200, and the elastic sealing ring 320 will not come out of the annular cavity to form the required sealing effect. In this kind of sealing, it ensures that the gas outside the non-woven fabric 100 can more quickly pass through the pores of the core 200 and enter the inside, taking away the moisture of the non-woven fabric 100 and achieving the curing effect more quickly.

[0088] In some embodiments of the present invention, in order to further improve the transmission stability between the thrust inclined plane of the elastic sealing ring 320 and the extrusion ring 330, a metal sheet can be embedded on the thrust inclined plane on the inner side of the elastic sealing ring 320 to ensure that the elastic sealing ring can be extruded.

[0089] Based on the above solution, asFigures 3 - 7 As shown, in the ventilation device 300 of the present invention, under the action of the pressure difference, the gas outside the non-woven fabric 100 can only pass through the non-woven fabric 100 and enter the core 200, and then be discharged through the ventilation device 100. During this process, hot air is formed to take away the heat of the non-woven fabric 100, accelerating its curing process. The magnitude of the pressure difference is controlled according to the air flow velocity at the air inlet end 316. The hot air discharged through the air outlet end 317 can pass through structures such as a fan, a pipeline, and an oven (all of which are conventional prior arts and will not be elaborated here) and then enter the air inlet end 316 again after circulation, forming a circulating air flow and reducing costs.

[0090] In order to make full use of the internal space of the first cylinder 310 to accelerate the hot air circulation efficiency and link the thrust cylinder 340 and the driven cylinder 360, the ventilation device 300 further includes a second cylinder assembly, and the second cylinder assembly includes:

[0091] A second cylinder 350, coaxially fixed inside the first cylinder 310 and axially located behind the thrust cylinder 340; a support plate 353 for fixing the second cylinder 350 is radially and uniformly arranged in the annular space between the second cylinder 350 and the first cylinder 310, and a second air guide hole 354 communicating with the inner cavity of the second cylinder 350 and the outside of the first cylinder 310 is provided through the support plate 353; the rear end of the second cylinder 350 is connected to a negative pressure exhaust fan;

[0092] A connecting shaft 351, passing through the second cylinder 350 along the axial direction, one end of the connecting shaft 351 is connected to the thrust cylinder 340, and the other end of the connecting shaft 351 is connected to the driven cylinder 360;

[0093] A sleeve 361, arranged at the center of the driven cylinder 360 and connected to the driven cylinder 360 through a radially arranged connecting rod 362, and the sleeve 361 is used to assemble the end of the connecting shaft 351; the connecting rod 362 passes through the second cylinder 350, and a sealing lining plate 352 slidably matched with the side surface of the second cylinder 350 is arranged on the connecting rod 362.

[0094] On the one hand, the front end of the connecting shaft 351 passes through the front end face of the second cylinder 350 and is connected to the thrust cylinder 340, and the rear end of the connecting shaft 351 is connected to the sleeve 361, thereby realizing the linkage between the thrust cylinder 340 and the driven cylinder 360. At the same time, the connecting rod 362 outside the sleeve 361 needs to pass through the second cylinder 350 to connect the driven cylinder 360. In order to ensure the sealing effect when it passes through the second cylinder 350, a sealing lining plate 352 is arranged on the connecting rod 362, and the sealing lining plate 352 is in an arc shape adapted to the inner side of the second cylinder 350, and the sealing lining plate 352 can be slidably embedded in the inner side or the outer side of the second cylinder 350 to ensure the tightness of the second cylinder 350;

[0095] On the other hand, as Figures 7 - 10 shown, the thrust cylinder 340 is driven to move backward by the high-speed air flow at the air inlet end 316. At the same time, the negative pressure exhaust fan of the oven extracts the gas inside the second cylinder 350 to form a negative pressure, so as to extract the hot air between the core 200 and the ventilation device 300 through the second air extraction holes 354. At the same time, the inside of the first cylinder 310 is divided into a plurality of independent air ducts by the support plate 353, increasing the air flow speed, so as to comprehensively improve the hot air circulation efficiency, accelerate the curing process of the non-woven fabric 100, shorten the curing process time to one-third of the original, and reduce the energy consumption to less than 20% of the original.

[0096] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A core for winding a wound polishing wheel, used for winding the coated non-woven fabric substrate, characterized in that, The core is a hollow tubular structure formed by winding a fiberglass mesh cloth impregnated with a thermosetting resin, and its porosity is 30%-70%; One end of the core is closed, and the other end is connected to a negative pressure extraction pipe; A cylindrical ventilation device coaxial with the core is arranged in the hollow chamber of the core, and a radial gap is left between the ventilation device and the inner side of the core. The ventilation device includes a first cylinder coaxial with the core, and the middle side of the first cylinder is evenly provided with first air intake holes. One end of the first cylinder serves as an air inlet end to introduce high-speed air flow, and the other end serves as an air outlet end to discharge high-speed air flow; The ventilation device further includes a self-sealing component, which includes elastic sealing rings sleeved at both ends of the first cylinder, and a sealing ring group for fixing the elastic sealing rings. The inner side of the elastic sealing ring has a thrust inclined plane; The sealing ring group includes: A fixing ring is arranged between the middle side of the first cylinder and the end of the first cylinder and protrudes radially outward from the first cylinder; and between the fixing ring and the end of the first cylinder, movable grooves are evenly opened along the circumferential direction of the first cylinder; A moving ring is assembled at the end of the first cylinder and forms an annular cavity for accommodating the elastic sealing ring with the fixing ring; An extrusion ring is embedded between the elastic sealing ring and the first cylinder and can axially slide in the annular cavity, and the outer side of the extrusion ring forms an inclined plane pair with the thrust inclined plane of the elastic sealing ring; A bottomed and lidless thrust cylinder is arranged inside the air inlet end. The bottom plate of the thrust cylinder is provided with air inlet holes along the air inlet direction. A limiting platform is arranged corresponding to the thrust cylinder inside the first cylinder, and a return spring is arranged between the thrust cylinder and the limiting platform; A driven cylinder is arranged inside the air outlet end, and the driven cylinder is linked with the thrust cylinder; Both between the extrusion ring and the thrust cylinder and between the extrusion ring and the driven cylinder are fixedly connected by connecting pieces passing through the movable grooves.

2. The core for winding a wound polishing wheel according to claim 1, characterized in that, The ventilation device further includes a second cylinder assembly, and the second cylinder assembly includes: A second cylinder is coaxially fixed inside the first cylinder and is axially located behind the thrust cylinder; a support plate for fixing the second cylinder is radially and evenly arranged in the annular space between the second cylinder and the first cylinder, and a second air intake hole communicating the inner cavity of the second cylinder with the outside of the first cylinder is penetrated through the support plate; the rear end of the second cylinder is communicated with a negative pressure exhaust fan; A connecting shaft passes through the second cylinder along the axis direction. One end of the connecting shaft is connected to the thrust cylinder, and the other end of the connecting shaft is connected to the driven cylinder; A sleeve is arranged at the center of the driven cylinder and is connected to the driven cylinder through a radially arranged connecting rod, and the sleeve is used for assembling the end of the connecting shaft; the connecting rod passes through the second cylinder, and a sealing lining plate slidably matched with the side surface of the second cylinder is arranged on the connecting rod.

3. The curing process of the core for winding the wound polishing wheel according to claim 1, characterized in that, Specifically, it includes the following steps: (1) Wind the non-woven fabric coated with the slurry around the core; (2) Seal one end of the core, and connect the other end of the core to the negative pressure extraction pipe of the oven to extract negative pressure. After removing moisture in the oven, it circulates to the outside of the core for hot air circulation curing.

4. The curing process of the core for winding the coiled polishing wheel according to claim 2, characterized in that, Specifically, it includes the following steps: (1) Wind the non-woven fabric coated with the slurry around the core; (2) Insert the ventilation device into the hollow chamber of the core, connect the second cylinder to the negative pressure exhaust fan of the oven, use the induced draft fan to lead the air inlet pipe into the core, and threadedly connect it to the air inlet end of the first cylinder in the core. Extend the end of the first cylinder into the air inlet of the oven, and the oven is used to remove the moisture of the gas and then discharge it to the outside of the core. (3) Start the negative pressure exhaust fan and the induced draft fan of the oven, suck the dry gas outside the core into the first cylinder and the second cylinder through the pores of the core, and send it into the oven. After quickly removing the moisture, it is discharged to the outside of the core to form a hot air circulation curing effect.

5. The curing process according to claim 3 or 4, characterized in that The slurry for coating the non-woven fabric includes hard glue, soft glue, abrasive, filler and additives, among which: The hard glue is an aqueous liquid phenolic resin accounting for 5%-20% of the mass fraction of the slurry. The soft glue is at least one of an aqueous polyurethane emulsion, an aqueous butadiene acrylonitrile emulsion, and an aqueous acrylic emulsion accounting for 10%-40% of the mass fraction of the slurry. The abrasive accounts for 30%-65% of the mass fraction of the slurry.

6. The curing process according to claim 5, characterized in that, The filler is at least one of calcium carbonate, spodumene, and aluminum hydroxide.

7. The curing process according to claim 5, characterized in that, The additives are at least one of pigment, color paste, anti-settling agent, co-solvent, grinding aid, heat absorption aid, and stearic acid.

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