A high weather-resistant green matte fastener conveying device

Abstract

This invention provides a high-weather-resistant, green matte fastener conveying device, relating to the field of fastener processing technology. It includes a protective housing, a conveying device arranged within the protective housing, and a hot-dip tank located at the end of the conveying device. The conveying device carries fasteners through the protective housing for cooling before unloading them into the hot-dip tank. A receiving guide net supports the fasteners unloaded from the conveying device and provides guidance, buffering the impact of the fasteners falling. A pump draws solution from the hot-dip tank and delivers it to nozzles. The jets from two sets of nozzles converge below the receiving guide net, creating an upward-flowing liquid flow in the center of the net. This flow lifts and disperses the fasteners unloaded from the conveying device, breaking up any stagnant air film, improving wetting efficiency, and forming a dynamic circulation, thus enhancing the uniformity of the film layer on the fastener surface. This device is suitable for nature reserves and ecologically sensitive areas, preventing light pollution.

Description

Technical Field

[0001] This invention belongs to the field of fastener processing technology, specifically, it relates to a high weather-resistant green matte fastener conveying device. Background Technology

[0002] In scenarios where fasteners are exposed to the natural environment for extended periods, such as photovoltaic power plants, wind power generation, outdoor steel structures, bridges, rail transit, power transmission towers, and marine engineering, fasteners, as fundamental components for mechanical connections and structural assembly, are subjected to prolonged exposure to sunlight, rain, extreme temperature variations, salt spray, windblown sand, and industrial corrosive media. This makes them prone to corrosion, coating peeling, and loosening failure. To further mitigate the negative impacts of these environments, fasteners must possess excellent atmospheric corrosion resistance and salt spray aging resistance, and their production and use processes must be low-emission, low-pollution, and release no harmful substances, complying with green manufacturing and environmentally friendly usage standards. Currently, to ensure fasteners meet high weather resistance requirements, the industry typically employs a hot-dip immersion process to coat the fastener surface with a protective layer. Pre-treated fasteners are transported to a hot-dip immersion tank via a conveyor, where the surface treatment solution is absorbed and adsorbed, resulting in a uniform protective film coating on the fastener surface to enhance weather resistance. After hot dipping, the workpiece is removed, drained, and cured to form the final protective layer. As an example, the hot-dip immersion tank uses a low-temperature aqueous surface treatment solution, generally with water as the dispersion medium, combined with weather-resistant resin, passivating components, matte modifiers, and environmentally friendly additives. This is a green wet film-forming system that allows film adhesion to be completed at relatively low temperatures, meeting both environmental and weather resistance requirements.

[0003] However, due to the influence of the viscosity and surface tension of the treatment liquid, as well as the complex structure of the workpiece such as threads, heads, and corners, the liquid flows, wets, and drains unevenly at the thread peaks, roots, inner holes, and grooves. This can easily lead to phenomena such as local thin film, sagging, dripping marks, exposed substrate, and inconsistent gloss. At the same time, the uneven distribution of temperature and concentration fields in the hot dipping tank, as well as the differences in liquid encapsulation and drainage speeds when the workpiece enters and exits the liquid, further exacerbate the unevenness of film thickness and appearance, affecting the consistency of the matte appearance, weather resistance stability, and assembly accuracy of the fasteners. This makes it difficult to meet the high-quality use requirements of high weather-resistant green matte fasteners. Summary of the Invention

[0004] The purpose of this invention is to provide a high weather-resistant green matte fastener conveying device, which solves the technical problem of uneven coating in related technologies.

[0005] At least one embodiment of the present invention provides a high weather-resistant green matte fastener conveying device, comprising: a protective box, a conveying device arranged inside the protective box, and a hot dipping tank located at the end of the conveying device. The conveying device is used to carry fasteners through the protective box for cooling and then unload them into the hot dipping tank. The receiving guide net is inclinedly set in the hot immersion tank, located below the unloading side of the conveyor device and away from the conveyor device. The height of the receiving guide net gradually decreases. The receiving guide net is used to support the fasteners unloaded from the conveyor device and provide guidance. The pump body and the nozzles connected to the pump body are used to draw the solution in the hot soaking tank and deliver it to the nozzles. There are two sets of nozzles, which are respectively set on the upper two sides of the receiving guide net. They are inclined from top to bottom towards the lower middle part of the receiving guide net. The jets of the two sets of nozzles converge below the receiving guide net, so that the liquid flow in the middle of the receiving guide net surges from bottom to top, in order to lift and disperse the fasteners that are unloaded from the conveying device. The transfer device is arranged at an angle in the hot immersion tank. One end of the transfer device is located inside the hot immersion tank and below the side of the receiving guide net away from the conveying device, while the other end extends to the outside of the hot immersion tank. The transfer device is used to carry the fasteners that have been unloaded from the guide net and transfer them to the outside of the hot immersion tank.

[0006] According to an exemplary embodiment of this disclosure, the receiving guide net has two limiting protrusions, which are arranged along the inclined direction of the receiving guide net; A support groove for receiving fasteners is formed between the two limiting protrusions, and the width of the support groove is greater than the width of the conveying device.

[0007] According to an exemplary embodiment of this disclosure, the two sets of nozzles are respectively located on the side of the limiting protrusion away from the support groove. The limiting protrusion is used to restrict the fastener from scattering away from the support groove, and the jet direction of the nozzle does not pass through the support groove, so that the jet impact of the nozzle does not directly act on the fastener.

[0008] According to an exemplary embodiment of this disclosure, the width of the support groove gradually increases along the inclined direction of the receiving guide net, the width at the beginning of the support groove is greater than the width of the conveying device, and the width at the inclined end of the support groove is less than the width of the transfer device.

[0009] According to an exemplary embodiment of this disclosure, the final section of the receiving guide net along the inclined direction is a buffer section, and no nozzles are arranged on both sides of the buffer section.

[0010] According to an exemplary embodiment of this disclosure, the height interval between the intersection point of the two sets of nozzles below the receiving guide net and the receiving guide net is 20~40mm.

[0011] According to an exemplary embodiment of the present disclosure, the pump body is further connected to a liquid suction head, which is placed in the hot soaking tank and located on the side closer to the transfer device and farther from the conveying device, so as to supply liquid to the nozzle and form a liquid flow along the fastener conveying direction.

[0012] According to an exemplary embodiment of this disclosure, the temperature of the solution in the hot immersion tank is 60°C to 70°C.

[0013] According to an exemplary embodiment of this disclosure, the cooling time of the fasteners inside the protective box is 10s to 20s.

[0014] This invention provides a high weather-resistant, green matte fastener conveying device. The receiving guide net is arranged at an angle in the middle of the hot-dip immersion tank, maintaining a certain height interval from the bottom of the tank. Preferably, the receiving guide net can be made of metal wire mesh. The wire mesh should have a certain degree of flexibility, allowing for some elastic deformation when receiving fasteners. However, it is necessary to ensure that the elastic deformation does not change the overall guiding direction of the receiving guide net. The receiving guide net provides flexible support for the fasteners unloaded from the conveying device, buffering the impact of the fasteners falling and preventing damage to fragile parts such as threads and heads. Furthermore, the angled guiding structure guides the fasteners to slide orderly along a fixed direction, preventing each fastener from receiving a similar hot-dip immersion time and wetting environment in the hot-dip immersion tank, thus ensuring the consistency of the film thickness and matte appearance of each fastener along the conveying path.

[0015] Two sets of nozzles are symmetrically arranged on both sides above the receiving guide net. The jets converge under the net to form a surging liquid flow from bottom to top. The flexible lifting force generated by the surging liquid flow can fully disperse the stacked and attached fasteners, eliminate mutual obstruction between workpieces, and ensure that the entire surface of each fastener is exposed to the treatment liquid. The surging liquid flow continuously impacts the surface of the fasteners, which can break the stagnant air film in dead corners such as thread roots, inner holes, and grooves, so that the low-temperature water-based treatment liquid can fully wet these complex parts, eliminating the problems of bottom leakage and thin film layer. The surging liquid flow drives the treatment liquid in the hot soaking tank to form a dynamic circulation, which can quickly equalize the temperature field and concentration field in the tank, avoid the viscosity change of the treatment liquid caused by local temperature and concentration differences, reduce phenomena such as dripping, dripping marks, and inconsistent gloss, and improve the uniformity of the film layer on the surface of the fasteners and the consistency of the matte appearance. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of a high weather-resistant green matte fastener conveying device provided in an embodiment of the present invention; Figure 2 This is an embodiment of the present invention. Figure 1 A structural schematic diagram of the central nozzle and the receiving guide net from one perspective; Figure 3 This is an embodiment of the present invention. Figure 1A structural schematic diagram of the central nozzle and the receiving guide net from another perspective.

[0018] In the diagram: 100, protective box; 200, conveying device; 300, hot immersion tank; 400, receiving guide net; 410, limiting protrusion; 420, support groove; 430, buffer section; 500, pump body; 510, liquid extraction head; 520, nozzle; 600, transfer device. Detailed Implementation

[0019] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure. For ease of understanding, the English abbreviations and related technical terms involved in the embodiments of this disclosure will be explained and described below.

[0020] It should be understood that the described embodiments are merely some, not all, of the embodiments disclosed herein. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without inventive effort are within the scope of protection of this disclosure.

[0021] The terminology used in the embodiments of this disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure. The singular forms “a,” “the,” and “the” as used in the embodiments of this disclosure and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0022] It should be understood that the term "and / or" used in this article is merely a way of describing the logical relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0023] Depending on the context, the word "if" as used here can be interpreted as "when" or "when" or "in response to determination" or "in response to detection." Similarly, depending on the context, the phrase "if determination" or "if detection (of the stated condition or event)" can be interpreted as "when determination" or "in response to determination" or "when detection (of the stated condition or event)" or "in response to detection (of the stated condition or event)."

[0024] It should be understood that the terms "first," "second," etc., used in this disclosure are for distinguishing purposes only and should not be construed as indicating or implying relative importance or order.

[0025] In the description of this disclosure, the terms “center,” “upper,” “lower,” “front,” “back,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this disclosure and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and should not be construed as a limitation of this disclosure.

[0026] In the description of this disclosure, it should be noted that, unless otherwise expressly specified and limited, the terms "installation", "connection" and "joining" should be interpreted broadly, for example, they can be fixed connections, detachable connections, mating connections or integral connections; those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0027] like Figures 1-3 As shown, this invention illustrates a high-weather-resistant, green matte fastener conveying device 200 according to one embodiment of the present invention. It is suitable for scenarios involving long-term exposure to natural environments, such as photovoltaic power stations, wind power generation, outdoor steel structures, bridges, rail transit, power transmission towers, and marine engineering. It addresses problems such as uneven film layer and poor appearance consistency in traditional hot-dip galvanizing processes. In this example, a protective housing 100 is included. Fasteners that have undergone hot-dip galvanizing and reached a temperature of approximately 400°C are fed into the protective housing 100. The conveying device 200, arranged within the protective housing 100, carries the fasteners along the interior of the housing and allows for natural cooling or cooling via a built-in fan, etc., without limitation. During continuous conveying, the protective housing 100 uniformly cools the fasteners. Preferably, see [reference needed]. Figure 1 The conveying device 200 is a conveyor belt, and the surface of the conveyor belt is provided with partition baffles at intervals to separate multiple fasteners into different areas. These baffles can be adjusted according to actual conditions and are not limited here.

[0028] The conveyor 200 continues to its end, smoothly unloading the cooled fasteners into a hot-dip tank 300 located below the end of the conveyor 200. The hot-dip tank 300 contains a low-temperature water-based surface treatment solution. As a reference example, the low-temperature water-based surface treatment solution uses water as a dispersion medium and is composed of weather-resistant resin, passivating components, matte modifiers, and environmentally friendly additives. A receiving guide net 400 is inclinedly installed below the unloading side of the conveyor 200 within the hot-dip tank 300. The height of the receiving guide net 400 gradually decreases away from the conveyor 200, serving to support the fasteners unloaded from the conveyor 200 and provide directional sliding guidance for the fasteners.

[0029] A pump body 500 is installed outside the hot immersion tank 300. The pump body 500 continuously draws low-temperature aqueous treatment liquid from the tank and delivers the treatment liquid to two sets of nozzles 520 connected to it. The two sets of nozzles 520 are respectively arranged on both sides above the receiving guide net 400, as shown below. Figure 2 and Figure 3 As shown, each group contains three nozzles 520. Two groups of nozzles 520 are symmetrically arranged on the left and right sides above the receiving guide net 400, both using a downward-sloping arrangement. The spray direction is towards the lower center of the receiving guide net 400. The solution jets from the two groups of nozzles 520 converge below the receiving guide net 400. The horizontal jet momentum cancels each other out, converting into an upward force, thus forming a stable upward surging liquid flow in the central region of the receiving guide net 400. This surging liquid flow can gently lift the fasteners that have just been removed and placed above the center of the receiving guide net 400, dispersing them and allowing them to slowly fall onto the receiving guide net 400. This fully disperses the stacked and adhered fasteners, ensuring that the surface of each fastener is in full contact with the treatment liquid, avoiding uneven wetting caused by stacking and obstruction. Figure 2 and Figure 3 As shown, it should be noted that there is no angle between the arrangement direction of the nozzle 520 and the receiving guide net 400 along the guide direction or the opposite direction.

[0030] Fasteners on the receiving guide net 400, under their own weight and the guiding action of the receiving guide net 400, slowly slide along the receiving guide net 400 towards the side away from the conveying device 200, and finally fall smoothly onto the transfer device 600. The transfer device 600 is also arranged at an angle in the hot soaking tank 300. One end of the transfer device 600 is located inside the hot soaking tank 300 and below the side of the receiving guide net 400 away from the conveying device 200, and is used to receive the fasteners falling off the receiving guide net 400. The other end of the transfer device 600 extends to the outside of the hot soaking tank 300, and can continuously transfer the fasteners that have completed the hot soaking treatment out of the hot soaking tank 300.

[0031] Based on the above example, in traditional hot dipping, fasteners fall directly into the hot dipping tank 300 after passing through the conveyor device 200, which is prone to collisions, deformation, and surface scratches. They are also prone to disorderly accumulation, resulting in significant differences in the hot dipping time and wetting state of each fastener, leading to uneven film thickness and inconsistent gloss. In this example, the receiving guide net 400 is arranged at an angle in the middle of the hot immersion tank 300, maintaining a certain height distance from the bottom of the hot immersion tank 300. Preferably, the receiving guide net 400 can be made of metal wire mesh. The wire mesh should have a certain degree of flexibility and be able to undergo some elastic deformation when receiving fasteners. However, it is necessary to ensure that the elastic deformation does not change the overall guiding direction of the receiving guide net 400. The receiving guide net 400 plays a flexible supporting role for the fasteners unloaded by the conveying device 200, buffering the impact force of the fasteners falling and avoiding collisions, deformations, and surface scratches on vulnerable parts such as threads and heads. In addition, the inclined guiding structure can guide the fasteners to slide in an orderly manner along a fixed direction, avoiding the situation where each fastener receives a similar hot immersion time and wetting environment in the hot immersion tank 300, and ensuring the consistency of film thickness and matte appearance of each fastener from the conveying path.

[0032] Meanwhile, the complex structure of fasteners, such as thread peaks, thread roots, inner holes, and grooves, is prone to uneven wetting in traditional hot-dip immersion processes. Affected by the viscosity and surface tension of the treatment liquid, the liquid is difficult to fully fill these dead corners, which can easily lead to problems such as local thin film, leakage, sagging, and dripping marks. In this example, two sets of nozzles 520 are symmetrically arranged on both sides above the receiving guide net 400. The jets converge under the net to form a surging liquid flow from bottom to top. The flexible lifting force generated by the surging liquid flow can fully disperse the stacked and attached fasteners, eliminate mutual obstruction between workpieces, and ensure that the entire surface of each fastener can be exposed in the treatment liquid. The surging liquid flow continuously impacts the surface of the fasteners, which can break the stagnant air film in dead corners such as the thread root, inner hole, and groove, so that the low-temperature water-based treatment liquid can fully wet these complex parts, eliminating the problems of bottom leakage and thin film layer. The surging liquid flow drives the treatment liquid in the hot soaking tank 300 to form a dynamic circulation, which can quickly equalize the temperature field and concentration field in the tank, avoid the viscosity change of the treatment liquid caused by local temperature and concentration differences, reduce phenomena such as dripping, dripping marks, and inconsistent gloss, and improve the uniformity of the film layer on the surface of the fasteners and the consistency of the matte appearance.

[0033] In a further example, the upper surface of the receiving guide net 400 is provided with two limiting protrusions 410. Both limiting protrusions 410 extend along the inclined direction of the receiving guide net 400 and are consistent with the inclined angle of the receiving guide net 400. A support groove 420 for receiving fasteners is formed between the two limiting protrusions 410. The fasteners unloaded by the conveying device 200 can all fall into the support groove 420 because the width of the support groove 420 is greater than the width of the conveying device 200, thus avoiding unloading deviation. During the sliding of the fasteners along the inclined direction, the limiting protrusions 410 on both sides can block the fasteners from the side, restricting them from scattering to both sides, ensuring that all fasteners slide along the fixed path of the support groove 420, and there will be no situation of detachment from the hot soaking area or leakage.

[0034] Two sets of nozzles 520 are respectively set on the side of the two limiting protrusions 410 away from the support groove 420, that is, on both sides of the edge area of ​​the receiving guide net 400. When working, the jets sprayed by the two sets of nozzles 520 converge below the receiving guide net 400, forming a liquid flow surging from bottom to top in the middle of the receiving guide net 400. The liquid flow passes through the mesh of the receiving guide net 400 and acts on the fasteners in the support groove 420 to achieve flexible lifting and dispersion. Moreover, the jet will not directly impact the fasteners in the support groove 420, preventing problems such as uneven local film layer, sagging, and abnormal gloss caused by jet scouring, and ensuring the integrity and uniformity of the film layer.

[0035] In a further example, the width of the support groove 420 gradually increases along the inclined direction of the receiving guide net 400. The width of the support groove 420 at the beginning near the conveying device 200 is greater than the width of the conveying device 200, ensuring that all fasteners unloaded in batches from the conveying device 200 can fall into the support groove 420, avoiding unloading deviation or leakage. The width of the support groove 420 at the inclined end away from the conveying device 200 is less than the width of the transfer device 600, ensuring that all fasteners in the support groove 420 can be smoothly unloaded onto the transfer device 600. At the same time, the width of the support groove 420 gradually increases along the sliding direction, providing more room for the fasteners sliding along the inclined direction, preventing the fasteners from being squeezed and stacked together due to narrow space during sliding, ensuring that each fastener can maintain an independent sliding state, fully contact the treatment liquid, and ensure uniform heat soaking.

[0036] In a further example, the end of the receiving guide net 400 along its own inclined direction is set as a buffer section 430. The buffer section 430 is located in the inclined end area of ​​the support groove 420, and no nozzles 520 are arranged on both sides of the buffer section 430, forming a relatively stable liquid flow environment. This can avoid the dynamic jet from causing scouring and disturbance to the treatment liquid film adsorbed on the surface of the fastener, and prevent the local film layer from being thinned or dispersed due to continuous liquid flow impact. This keeps the film layer adsorbed on the surface of the fastener in a stable state and ensures that the film layer thickness and composition distribution are uniform.

[0037] In a further example, two sets of nozzles 520 spray downwards at an angle, forming a convergence point below the receiving guide net 400. The height interval between this convergence point and the receiving guide net 400 is controlled at 20-40mm. Here, the height refers to the vertical distance between the jet convergence point and the receiving guide net 400, not the vertical distance. This height range prevents the jet flow from directly and rigidly impacting the receiving guide net 400 due to excessively small intervals, avoiding excessive impact force that could cause violent shaking, collisions, or structural damage to the fasteners in the support groove 420, such as threads or heads. Conversely, excessive intervals prevent excessive attenuation of the jet flow, which would result in insufficient power when the upward-flowing liquid reaches the receiving guide net 400, making it unable to effectively lift and disperse the stacked fasteners, and failing to break the stagnant air film on the fastener surface and in dead corners such as thread roots and grooves. The 20-40mm height range is ideal. The height interval allows the formed surge to pass through the receiving guide net 400 in a gentle and uniform manner and act on the fastener. This ensures that the solution fully wets the entire area of ​​the fastener, solving the problems of uneven wetting and thin film in complex structures. It also avoids excessively violent liquid flow disturbance that could cause imbalance in the temperature and concentration fields of the solution in the hot soaking tank 300, reducing defects such as film sagging and inconsistent matte gloss caused by local environmental anomalies.

[0038] In a further example, the suction head 510 connected to the pump body 500 is placed inside the hot soaking tank 300, and is located on the side closer to the transfer device 600 and farther from the conveying device 200. The pump body 500 draws the treatment solution from the hot soaking tank 300 through the suction head 510, and then pressurizes and delivers the solution to the nozzles 520 on both sides of the receiving guide net 400. When the pump body 500 draws the solution, it generates a directional traction force on the solution in the hot soaking tank 300, causing the solution to flow smoothly from the unloading area of ​​the conveying device 200 to the area of ​​the transfer device 600, forming a forward flow consistent with the fastener conveying direction. This provides auxiliary pushing force for the sliding fasteners and prevents them from tightening. If parts become stuck, stagnant, or accumulate in the support tank 420, the forward liquid flow can regulate the overall flow field in the hot immersion tank 300, reducing the generation of local eddies and turbulence. The directional liquid extraction of the liquid extraction head 510, combined with the liquid spraying of the nozzle 520, forms a directional circulating flow field in the hot immersion tank 300, so as to balance the temperature field and concentration field of the solution in the tank, avoiding problems such as film sagging, uneven thickness, and abnormal gloss caused by excessively high local solution temperature or concentration differences. It is compatible with the film formation process requirements of low-temperature water-based surface treatment solution, ensuring that fasteners in different locations and batches can be hot-immersed in a stable solution environment, thus improving the stability of product quality.

[0039] In a further example, the solution temperature in the hot dipping tank 300 is 60℃~70℃. When the solution temperature is below 60℃, the viscosity of the treatment solution will increase significantly, and the solution's fluidity and wetting ability will decrease. It will be unable to fully penetrate into the complex dead corners of fastener threads, inner holes, corners, etc., which are prone to problems such as insufficient local wetting, thin film layer, and exposed substrate. At the same time, the solution leveling speed will slow down, and defects such as sagging, dripping marks, and uneven matte gloss will form after drying. When the solution temperature is above 70℃, the water in the solution will evaporate too quickly, resulting in a fast local film formation speed on the fastener surface. Pinholes and bubbles are easily generated inside the film layer. At the same time, high temperature will destroy the activity of weather-resistant resin, matte modifier and other additives in the solution, reduce the density and adhesion of the film layer, and make the fastener prone to coating peeling and corrosion under sunlight and salt spray environment. A solution temperature of 60℃~70℃ can maintain the appropriate viscosity and fluidity of the treatment solution, which can ensure sufficient wetting of the complex structure of the fastener, and allow the film layer to flow and cure slowly and evenly, thus ensuring the uniformity of the coating, the consistency of the matte appearance, and the weather resistance stability of the film layer.

[0040] After being cooled by the protective chamber, the fastener's temperature range is 305℃~355℃. When the temperature is below 305℃, the fastener is over-cooled, the overall workpiece temperature is too low, and the temperature difference between the fastener and the treatment solution is insufficient. This reduces the wetting, spreading, and adsorption capacity of the treatment solution on the workpiece surface, easily leading to uneven film adhesion, incomplete film formation, and localized leakage. It is impossible to form a continuous and uniform protective film. When the temperature is above 355℃, the fastener is under-cooled, the surface temperature is too high, and the temperature difference between the fastener and the treatment solution is too large. This causes the treatment solution to dry and solidify rapidly after contacting the workpiece, resulting in insufficient wetting and penetration. Defects such as thin film, sagging, and blistering are likely to occur in the deep threads and corners. At the same time, high temperature can also easily cause secondary oxidation on the workpiece surface, reducing the film adhesion and appearance consistency.

[0041] With the initial temperature of the fastener at 400℃ and allowed to cool naturally, a cooling time of less than 30 seconds results in insufficient cooling, a large temperature difference between the surface and the core / deep threads, uneven overall workpiece temperature distribution, and an imbalance between the temperature difference between high-temperature areas and the treatment fluid. This can lead to excessively rapid wetting and film formation by the treatment fluid, causing defects such as inconsistent film thickness and sagging on the same workpiece. Conversely, a cooling time exceeding 42 seconds results in excessive cooling of the fastener, with an overall workpiece temperature that is too low and insufficient temperature difference with the treatment fluid. This reduces the wetting and adsorption capacity of the treatment fluid. Furthermore, an excessively long cooling cycle can disrupt the device's conveying rhythm, affecting continuous operation efficiency and potentially causing uneven film adhesion and incomplete film formation. A cooling time of 30-42 seconds ensures that the fastener cools uniformly from 400℃ to the optimal temperature, with consistent internal and external temperature distribution, avoiding both insufficient and excessive cooling.

[0042] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high weather-resistant, green matte fastener conveying device, characterized in that, include: A protective housing (100) is provided inside which a conveying device (200) is provided for supporting fasteners; A hot immersion bath (300) is located at the outlet end of the protective enclosure (100); A guide net (400) is inclined downwards in the hot soaking tank (300) on the side away from the protective box (100) to receive fasteners that have cooled naturally after being unloaded from the conveying device (200). A pump body (500) is connected to two sets of nozzles (520) respectively distributed on both sides of the receiving guide net (400). The pump body (500) is used to draw the solution in the hot soaking tank (300) and spray it through the two sets of nozzles (520) to the upper sides of the receiving guide net (400). The two sets of nozzles (520) are both facing the lower center of the receiving guide net (400) so that the jets sprayed by the two sets of nozzles (520) can converge below the receiving guide net (400), thereby generating a liquid flow from bottom to top in the middle of the receiving guide net (400) to lift and disperse the fasteners unloaded from the conveying device (200). The transfer device (600) has one end located inside the hot immersion tank (300) and on the discharge side of the receiving guide net (400), and the other end extends to the upper outer side of the hot immersion tank (300). The transfer device (600) is used to carry the fasteners that are unloaded from the receiving guide net (400) and transfer the fasteners to the outside of the hot immersion tank (300).

2. The high weather-resistant green matte fastener conveying device according to claim 1, characterized in that, The receiving guide net (400) has two limiting protrusions (410), which are arranged along the inclined direction of the receiving guide net (400); A support groove (420) is formed between the two limiting protrusions (410) for receiving fasteners that are unloaded from the conveying device (200), the width of the support groove (420) being greater than the width of the conveying device (200).

3. The high weather-resistant green matte fastener conveying device according to claim 2, characterized in that, The two sets of nozzles (520) are located on the outside of the limiting protrusion (410), and the nozzles (520) face the area outside the limiting protrusion (410) so that the jet impact of the nozzles (520) does not directly act on the fastener.

4. The high weather-resistant green matte fastener conveying device according to claim 3, characterized in that, Along the inclined direction of the receiving guide net (400), the width of the support groove (420) gradually increases, the width of the feed end of the support groove (420) is greater than the width of the conveying device (200), and the width of the discharge end of the support groove (420) is less than the width of the transfer device (600).

5. The high weather-resistant green matte fastener conveying device according to claim 4, characterized in that, The discharge end of the receiving guide net (400) is provided with a buffer section (430), which is a plate-shaped component.

6. A high weather-resistant green matte fastener conveying device according to any one of claims 1-5, characterized in that, The height interval between the intersection of the jet directions of the two sets of nozzles (520) and the receiving guide net (400) is 20~40mm.

7. A high weather-resistant green matte fastener conveying device according to claim 6, characterized in that, The pump body (500) is also connected to a liquid suction head (510), which is placed inside the hot soaking tank (300) and located at the discharge end of the transfer device (600) to supply liquid to the nozzle (520) and form a liquid flow along the fastener conveying direction.

8. A high weather-resistant green matte fastener conveying device according to claim 7, characterized in that, The temperature of the solution in the hot immersion tank (300) is 60℃~70℃.

9. A high weather-resistant green matte fastener conveying device according to claim 8, characterized in that, The cooling time of the fasteners inside the protective box (100) is 30s~42s.

10. A high weather-resistant green matte fastener conveying device according to claim 9, characterized in that, The temperature of the fasteners inside the protective enclosure (100) after cooling is 305℃~355℃.

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