A shoe glue spraying temperature control and environment-friendly pressing device based on cold and hot two-way utilization of a vortex tube

Abstract

The application discloses a shoe glue spraying temperature control and environment-friendly pressing device based on cold and hot bidirectional utilization of a vortex tube, which comprises a vortex tube, a glue spraying gun and a cold curtain generating assembly. Cold end outlets and hot end outlets are arranged at two ends of the vortex tube respectively, and a compressed air inlet is arranged on a side wall of the vortex tube. The glue spraying gun comprises an atomization air inlet, and the atomization air inlet is communicated with the hot end outlet through a hot compensation pipeline. An air inlet end of the cold curtain generating assembly is communicated with the cold end outlet through a flexible universal duct, and the cold curtain generating assembly is arranged above a working area of the glue spraying gun. The cold and hot separation characteristics of the vortex tube are utilized, hot end airflow is introduced into the atomization air inlet of the glue spraying gun to compensate the expansion cooling effect, and the glue colloid is prevented from being blocked by glue hanging; the cold end airflow is introduced into the cold curtain generating assembly to form a cold air curtain above the working area, and VOCs diffusion is effectively inhibited.

Description

Technical Field

[0001] This application relates to the field of shoemaking adhesive spraying equipment technology, specifically to a shoemaking adhesive spraying temperature control and environmentally friendly pressing device based on the bidirectional utilization of vortex tube for hot and cold heat. Background Technology

[0002] In the adhesive application process of the shoe manufacturing industry, pneumatic glue guns are one of the most widely used adhesive application tools. Their working principle is based on compressed air as a power source, using a high-speed airflow to atomize the adhesive and spray it onto the surfaces to be bonded, such as the sole or upper. In actual production, when compressed air is throttled and expanded before being sprayed from the nozzle, the distance between gas molecules increases, requiring them to absorb heat from the surrounding environment to maintain energy balance, thus producing a significant Joule-Thomson cooling effect. This effect causes a sharp drop in temperature in the nozzle exit area, with localized temperature drops reaching 10 to 20 degrees Celsius.

[0003] The viscosity of shoe adhesives (usually neoprene-based or polyurethane-based adhesives) is highly sensitive to temperature changes. When the temperature in the nozzle area drops below the adhesive flow threshold, the viscosity increases significantly, resulting in poor flowability. This leads to adhesion and accumulation on the inner wall of the nozzle and at the exit edge, a phenomenon known as "adhesive buildup" or "nozzle blockage." As continuous operation time increases, the adhesive layer thickens, eventually causing poor adhesive flow, spray trajectory deviation, and uneven coating. In severe cases, it may require machine shutdown and nozzle cleaning, directly impacting production efficiency and the consistency of adhesive coating quality.

[0004] Besides process issues caused by temperature drops, organic solvents (such as ethyl acetate, methyl ethyl ketone, and toluene) in the adhesive spraying process evaporate in large quantities during atomization, forming volatile organic compound (VOC) mists. These harmful gases have high concentrations in the core coating area and rapidly diffuse into the surrounding environment due to molecular diffusion, posing a threat to the respiratory health of operators. Currently, the industry mainly uses overall workshop exhaust ventilation or external exhaust hoods for VOCs control. However, because the exhaust vents are usually some distance from the coating point, local airflow organization cannot achieve immediate capture and directional discharge of harmful mists in the initial stage of diffusion, resulting in limited actual capture efficiency and high energy consumption.

[0005] To address the two technical issues mentioned above, existing improvement solutions mainly focus on two directions. Regarding temperature control, some solutions use electric heating elements to auxiliary heat the spray gun body or adhesive supply pipeline, using an external heat source to counteract the cooling effect of compressed air expansion, thus maintaining the fluidity of the adhesive. Such solutions require additional power supply lines and temperature control modules, correspondingly increasing system complexity and failure rate. Furthermore, the electric heating elements have significant thermal inertia, resulting in a delayed temperature response, making it difficult to achieve real-time matching with transient changes in compressed air flow. Regarding VOCs suppression, some solutions improve collection efficiency by increasing exhaust air volume or optimizing the hood structure. However, limited by aerodynamic principles, the marginal effect of improving near-field collection efficiency diminishes, and the increase in energy consumption is disproportionate to the improvement in treatment effect. Summary of the Invention

[0006] In view of the above problems, this application provides a temperature control and environmentally friendly pressing device for shoe adhesive spraying based on the bidirectional utilization of vortex tube for hot and cold heat, so as to solve the problems of glue blockage and waste gas diffusion in the existing shoe adhesive spraying process.

[0007] To achieve the above objectives, the inventors provide a temperature control and environmentally friendly pressing device for shoe adhesive spraying based on the bidirectional utilization of vortex tubes for both hot and cold heat, comprising:

[0008] A vortex tube, wherein the two ends of the vortex tube are respectively provided with a cold end outlet and a hot end outlet, and the side wall of the vortex tube is provided with a compressed air inlet;

[0009] A glue spray gun, comprising an atomizing air inlet, wherein the atomizing air inlet is connected to the hot end outlet via a heat compensation pipeline; and

[0010] A cold curtain generating component, wherein the air inlet of the cold curtain generating component is connected to the cold end outlet through a flexible universal duct, and the cold curtain generating component is disposed above the working area of ​​the glue spray gun.

[0011] Furthermore, the cold curtain generating assembly includes a pressure stabilizing chamber, the bottom of which is provided with a plurality of outwardly and downwardly inclined continuous slit nozzles, the plurality of continuous slit nozzles being arranged in a surrounding manner, and guide vanes being provided on both sides of the continuous slit nozzles respectively.

[0012] Furthermore, the width of the continuous slit nozzle is 0.8 mm and the length is 120 mm.

[0013] Furthermore, the outlet wind speed of the continuous slit nozzle is set to 8-12 m / s.

[0014] Furthermore, the guide vane causes the cold air curtain output through the continuous slit nozzle to tilt outward at an angle of 15°±5° with respect to the vertical direction.

[0015] Furthermore, the cold air curtain generated by the cold curtain generating component has a coverage area of ​​at least 60 cm3.

[0016] Furthermore, the diameter of the thermal compensation pipeline is 6mm.

[0017] Furthermore, the atomizing air inlet of the glue spray gun is detachably and sealed to one end of the heat compensation pipeline.

[0018] Furthermore, the material of the thermal compensation pipeline is high-temperature resistant sealing steel.

[0019] Furthermore, the length of the flexible universal conduit is set to be at least 200 mm.

[0020] Furthermore, the flexible universal conduit is made of polyvinyl chloride or stainless steel corrugated pipe.

[0021] Furthermore, it also includes an adjustment bracket, which is disposed above the glue spray gun, and the cold curtain generating component is disposed on the adjustment bracket.

[0022] Furthermore, the outer side of the heat compensation pipeline is wrapped with a heat insulation layer, the thickness of which is not less than 5mm.

[0023] Furthermore, it also includes a flow equalization plate, which is horizontally disposed inside the pressure stabilizing chamber.

[0024] Furthermore, the intake pressure of the vortex tube is set to 0.4-0.6 MPa.

[0025] Furthermore, the temperature range of the cold end outlet of the vortex tube is set to -5°C to 0°C.

[0026] Unlike existing technologies, the above technical solution uses a vortex tube to separate compressed air into two streams, hot and cold, which are then utilized separately. The hot stream is used for adhesive spraying temperature control to prevent adhesive blockage, while the cold stream is used for VOCs suppression to achieve environmentally friendly suppression. This achieves dual-function output under the same energy input. No external power input is required; it can operate solely on compressed air, reducing energy consumption and system complexity. The vortex tube's lack of moving parts and maintenance-free characteristics ensure the long-term operational reliability of the device.

[0027] The above description of the invention is merely an overview of the technical solution of this application. In order to enable those skilled in the art to better understand the technical solution of this application and to implement it based on the description and drawings, and to make the above-mentioned objectives and other objectives, features and advantages of this application easier to understand, the following description is provided in conjunction with the specific embodiments and drawings of this application. Attached Figure Description

[0028] The accompanying drawings are only used to illustrate the principles, implementation methods, applications, features, and effects of specific embodiments of the present invention and other related contents, and should not be considered as limitations on this application.

[0029] In the accompanying drawings of the instruction manual:

[0030] Figure 1 This is a schematic diagram of a shoe-making spray adhesive temperature control and environmentally friendly pressing device based on the bidirectional utilization of hot and cold water using a vortex tube, as described in a specific embodiment.

[0031] Figure 2 This is a schematic diagram of the structure of the glue spray gun described in a specific embodiment;

[0032] Figure 3 This is a schematic diagram of the vortex tube described in a specific embodiment;

[0033] Figure 4 This is a schematic diagram of the structure of the cold curtain generating component described in a specific embodiment;

[0034] Figure 5 This is a schematic diagram of the structure of the cold curtain generating component according to another specific embodiment.

[0035] The reference numerals used in the above figures are explained as follows:

[0036] 10. Vortex tube; 101. Cold end outlet; 102. Hot end outlet; 103. Compressed air inlet; 20. Glue gun; 201. Atomizing air inlet; 30. Thermal compensation pipeline; 40. Cold curtain generating assembly; 50. Flexible universal guide tube; 401. Pressure stabilizing chamber; 403. Flow guide plate; 402. Continuous slit nozzle; 404. Flow equalization plate. Detailed Implementation

[0037] To illustrate the possible application scenarios, technical principles, implementable specific solutions, and achievable objectives and effects of this application in detail, the following description, in conjunction with the listed specific embodiments and accompanying drawings, provides a detailed explanation. The embodiments described herein are merely illustrative of the technical solutions of this application and are therefore intended to limit the scope of protection of this application.

[0038] In this document, the term "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The term "embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment, nor does it specifically limit its independence or connection with other embodiments. In principle, in this application, as long as there are no technical contradictions or conflicts, the technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.

[0039] Unless otherwise defined, the technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the use of related terms herein is merely for the purpose of describing particular embodiments and is not intended to limit this application.

[0040] In the description of this application, the term "and / or" is used to describe the logical relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A exists, B exists, and A and B exist simultaneously. Additionally, the character " / " in this document generally indicates that the preceding and following objects have an "or" logical relationship.

[0041] In this application, terms such as “first” and “second” are used only to distinguish one entity or operation from another, and do not necessarily require or imply any actual quantity, hierarchy or order relationship between these entities or operations.

[0042] Without further limitations, the use of terms such as “comprising,” “including,” “having,” or other similar open-ended expressions in this application is intended to cover non-exclusive inclusion, which does not exclude the presence of additional elements in a process, method, or product that includes the stated elements, such that a process, method, or product that includes a list of elements may include not only those defined elements but also other elements not expressly listed, or elements inherent to such a process, method, or product.

[0043] In this application, expressions such as "greater than", "less than", and "exceeding" are understood to exclude the stated number; expressions such as "above", "below", and "within" are understood to include the stated number. Furthermore, in the description of the embodiments of this application, "multiple" means two or more (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups" and "multiple times", unless otherwise explicitly specified.

[0044] In the description of the embodiments of this application, the space-related expressions used, such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "vertical," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specific embodiments or drawings. They are only for the purpose of describing the specific embodiments of this application or for the reader's understanding, and do not indicate or imply that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0045] Unless otherwise expressly specified or limited, the terms "installation," "connection," "linking," "fixing," and "setting," as used in the description of the embodiments of this application, should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral arrangement; it can be a direct connection or an indirect connection through an intermediate medium; it can be a relationship of two components combined together, an interaction relationship between two components, or a connection within two structures. Those skilled in the art to which this application pertains can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0046] Please see Figure 1-5 This embodiment provides a shoe-making adhesive spraying temperature control and environmentally friendly pressing device based on the bidirectional hot and cold utilization of vortex tube 10, including:

[0047] The vortex tube 10 has a cold end outlet 101 and a hot end outlet 102 at its two ends, and a compressed air inlet 103 is provided on the side wall of the vortex tube 10.

[0048] Glue spray gun 20, the glue spray gun 20 including an atomizing air inlet 201, the atomizing air inlet 201 being connected to the hot end outlet 102 via a heat compensation pipe 30; and

[0049] A cold curtain generating component 40 is provided, wherein the air inlet of the cold curtain generating component 40 is connected to the cold end outlet 101 via a flexible universal conduit 50, and the cold curtain generating component 40 is disposed above the working area of ​​the glue spray gun 20.

[0050] The vortex tube 10 is a device that uses the energy of compressed air itself to separate hot and cold airflows. Its working principle is as follows: Compressed air enters the vortex tube 10 through the compressed air inlet 103 on the side wall, and after being accelerated by the vortex chamber, it forms a high-speed rotating airflow. During rotation, the kinetic energy of the outer layer of air is converted into internal energy, and its temperature rises to form a hot airflow, which is discharged from the hot end outlet 102; the kinetic energy of the inner layer of air decreases, and its temperature drops to form a cold airflow, which is discharged from the cold end outlet 101. The temperature range of the cold end outlet 101 is set to -5℃ to 0℃. The vortex tube 10 requires no external energy input, operating solely with compressed air. It has no moving parts and high reliability. The hot end outlet 102 of the vortex tube 10 is typically equipped with a regulating valve, which can control the temperature and flow ratio of the hot and cold airflows by adjusting the hot end exhaust volume.

[0051] The energy separation efficiency of the vortex tube 10 is controlled by an adjusting handle located at the hot-end outlet 102. The adjusting handle adjusts the flow ratio of the hot and cold air streams by changing the opening of the hot-end outlet 102. When the opening of the hot-end outlet 102 decreases, the hot-end exhaust volume decreases, the hot air stream temperature increases, and the cold-end exhaust volume increases, resulting in a decrease in the cold air stream temperature. Conversely, when the opening of the hot-end outlet 102 increases, the hot air stream temperature decreases, and the cold air stream temperature increases. Operators can change the airflow parameters at the hot and cold ends by rotating the adjusting handle according to the actual glue spraying process requirements, ensuring that the vortex tube 10 can output the required hot and cold air streams under different operating conditions, thus improving the process adaptability of the device.

[0052] Preferably, the inlet pressure of the vortex tube 10 is set to 0.4 to 0.6 MPa. This pressure range matches the supply pressure of a conventional compressed air system in a shoe manufacturing workshop, allowing for direct connection without the need for additional pressurization or depressurization devices. If the inlet pressure is too low, the energy separation effect of the vortex tube 10 decreases, the temperature difference between the hot and cold ends diminishes, and it cannot generate sufficiently high-temperature hot airflow and sufficiently low-temperature cold airflow. If the inlet pressure is too high, although the temperature difference between the hot and cold ends increases, the consumption of compressed air increases, energy consumption rises, and it may exceed the design operating pressure range of the vortex tube 10. Controlling the inlet pressure within the range of 0.4 to 0.6 MPa ensures effective heat and cold separation while also considering energy economy and equipment safety.

[0053] The glue spray gun 20 is the actuator for performing the glue application operation, and it includes an atomizing air inlet 201. Compressed air enters the glue spray gun 20 through the atomizing air inlet 201 and is sprayed out at high speed at the nozzle, using the airflow shearing action to atomize the glue. In actual production, the compressed air at the nozzle outlet undergoes a Joule-Thomson cooling effect due to throttling expansion, causing the temperature in the nozzle area to drop by 10 to 20 degrees Celsius. When the temperature drops below the glue flow threshold, the glue viscosity increases, making it easy for glue to accumulate on the inner wall of the nozzle. In this embodiment, the atomizing air inlet 201 of the glue spray gun 20 is connected to the hot end outlet 102 of the vortex tube 10 through a thermal compensation pipe 30, introducing the hot airflow separated from the vortex tube 10 into the atomizing air inlet 201, where it mixes with the compressed air and participates in the atomization process. The heat carried by the hot airflow compensates for the temperature drop caused by the expansion and heat absorption at the nozzle in real time, keeping the glue within a suitable flow temperature range during the atomization process.

[0054] It should be noted that the hot gas outlet temperature of the vortex tube 10 is set to 40 to 70 degrees Celsius. This temperature range matches the suitable atomization temperature range for shoe adhesives. When the hot gas flow temperature is below 40 degrees Celsius, the compensation for the expansion and cooling effect at the nozzle is insufficient, and the temperature in the nozzle area may still drop below the adhesive flow threshold, failing to effectively prevent adhesive clogging. When the hot gas flow temperature is above 70 degrees Celsius, the solvent in the adhesive may evaporate too quickly or the adhesive may cure prematurely at the nozzle, similarly affecting atomization quality and spraying effect. Controlling the hot gas outlet temperature within the range of 40 to 70 degrees Celsius ensures the fluidity of the adhesive while avoiding heat damage.

[0055] The glue spray gun 20 is a Nordson LS-373 pneumatic glue spray gun. This model of glue spray gun 20 is widely used in the footwear industry. Its atomizing air inlet 201 is a standard threaded interface, compatible with the 6 mm diameter and threaded connector of the heat compensation pipeline 30, allowing for direct connection without additional adapters. The atomization efficiency and glue flow range of this glue spray gun 20 are adapted to the requirements of shoe sole coating processes. The main body of the glue spray gun 20 is made of high-quality steel, possessing good corrosion resistance and structural strength, and can maintain stable working performance in working environments where it is in long-term contact with organic solvents and colloids.

[0056] The cold curtain generating assembly 40 is the environmentally friendly pressing execution unit of the device. Its air inlet is connected to the cold end outlet 101 of the vortex tube 10 via a flexible universal conduit 50. The cold curtain generating assembly 40 is positioned above the working area of ​​the glue spray gun 20, that is, near the nozzle and above the glue application surface. The cold airflow (temperature range -5 to 0 degrees Celsius) discharged from the cold end outlet 101 of the vortex tube 10 is transported to the cold curtain generating assembly 40 via the flexible universal conduit 50. The cold curtain generating assembly 40 sprays the cold airflow at a certain velocity and direction onto the glue application surface, forming a cold air curtain covering the glue application area. As a low-temperature physical barrier, the cold air curtain can reduce the kinetic energy of volatile organic compound molecules in the glue application area, slow down their diffusion rate, and thus inhibit the emission of VOCs into the surrounding environment. The slit nozzle outlet velocity of the cold curtain generating assembly 40 is set to 8 to 12 meters per second. This velocity range is selected based on the balance between the coverage area of ​​the cold air curtain and the airflow retention capacity. When the outlet air velocity is too low, the cold airflow has already diffused and diluted before reaching the adhesive application surface, failing to form an effective low-temperature barrier. When the outlet air velocity is too high, the cold airflow may impact the adhesive application surface, affecting the uniformity of the adhesive spread, and the high-speed airflow generates significant noise. Controlling the outlet air velocity within the range of 8 to 12 meters per second ensures that the cold airflow retains sufficient kinetic energy and low temperature upon reaching the application surface, while avoiding adverse interference with the adhesive application process.

[0057] During operation, compressed air supplied by the compressed air source enters the vortex tube 10 through the compressed air inlet 103 on the side wall of the vortex tube 10. Inside the vortex tube 10, the compressed air is accelerated by the vortex chamber, forming a high-speed rotating airflow. Under centrifugal force, it separates into an outer hot airflow and an inner cold airflow. The outer hot airflow exits from the hot end outlet 102 of the vortex tube 10 and is transported along the heat compensation pipeline 30 to the atomizing air inlet 201 of the glue spray gun 20. There, it mixes with the compressed air entering the glue spray gun 20 and participates in the atomization of the adhesive. The heat carried by the hot airflow compensates in real time for the Joule-Thomson cooling effect caused by the expansion of the compressed air at the nozzle outlet, keeping the temperature in the nozzle area above the adhesive flow threshold. This prevents the adhesive from increasing in viscosity due to low temperature, avoiding adhesive buildup and nozzle clogging. The heat insulation layer covering the outside of the heat compensation pipeline 30 reduces heat loss during transport, ensuring that the airflow temperature reaching the glue spray gun 20 meets process requirements. Simultaneously, the inner layer of cold airflow exits from the cold end outlet 101 of the vortex tube 10 and enters the pressure-stabilizing chamber 401 of the cold curtain generating component 40 along the flexible universal guide 50. After the cold airflow undergoes flow equalization in the pressure-stabilizing chamber 401, the pressure tends to be uniform, the flow velocity decreases, and airflow pulses are eliminated. The stabilized cold airflow is ejected from the continuous slit nozzle 402 at the bottom of the pressure-stabilizing chamber 401, and under the guidance of the guide plate 403, it forms an outward tilt angle with the vertical direction. The cold airflow from multiple nozzles together forms an inverted umbrella-shaped cold air curtain above the coating surface. This cold air curtain covers the core coating area, and the low-temperature airflow reduces the thermal kinetic energy of volatile organic compound molecules in the coating area, slowing down their diffusion rate into the surrounding environment, thereby suppressing VOCs. During continuous operation, the vortex tube 10 continuously separates the compressed air into two airflows, hot and cold. The hot end airflow circulates to compensate for the temperature drop of the adhesive, while the cold end airflow continuously maintains the cold air curtain. The two do not interfere with each other and operate synchronously. After the operation is completed, the compressed air source is turned off, the vortex tube 10 stops working, the output of hot and cold airflow is simultaneously terminated, and the entire device stops operating. The above operation process requires no external electrical power input and can be completed solely by compressed air.

[0058] The vortex tube 10 separates compressed air into two streams, hot and cold, which are then used separately. The hot stream is used for adhesive spraying temperature control to prevent adhesive blockage, while the cold stream is used for VOCs suppression to achieve environmentally friendly suppression. This achieves dual-function output under the same energy input. No external power input is required; it can operate solely on compressed air, reducing energy consumption and system complexity. The vortex tube 10's lack of moving parts and maintenance-free characteristics ensure the long-term operational reliability of the device.

[0059] Furthermore, a temperature sensor and a flow regulating valve can be installed at the connection between the thermal compensation pipeline 30 and the hot end outlet 102 of the vortex tube 10 to form a closed-loop temperature control circuit. The temperature sensor detects the temperature of the airflow entering the atomizing inlet 201 in real time. When the detected value deviates from the preset range, the control system changes the hot end exhaust volume or the compressed air inlet 103 flow rate through the regulating valve to stabilize the hot airflow temperature within the target range. This improves temperature control accuracy and adapts to the different atomization temperature requirements of different adhesive types.

[0060] In some embodiments, the cold curtain generating assembly 40 includes a pressure stabilizing chamber 401, the bottom of which is provided with a plurality of outwardly and downwardly inclined continuous slit nozzles 402, the plurality of continuous slit nozzles 402 being arranged in a surrounding manner, and guide vanes 403 being provided on both sides of the continuous slit nozzles 402, the outlet wind speed of the continuous slit nozzles 402 being preferably set to 8-12 m / s.

[0061] The pressure-stabilizing chamber 401 is the main structure of the cold curtain generating assembly 40. It has an internal cavity of a certain volume to accommodate and stabilize the cold airflow from the flexible universal duct 50. After the cold airflow enters the pressure-stabilizing chamber 401, because the chamber's cross-sectional area is much larger than the duct's cross-sectional area, the airflow velocity decreases and the pressure tends to be uniform, thereby eliminating airflow pulsations and unevenness, and providing stable air source conditions for subsequent uniform outflow. The pressure-stabilizing chamber 401 can adopt a rectangular, circular, or other shaped closed cavity structure, and its volume is matched to the required coverage area of ​​the cold air curtain.

[0062] A continuous slit nozzle 402 is located at the bottom of the pressure-stabilizing chamber 401. It is an elongated slit that extends continuously along the edge or perimeter of the chamber bottom. Multiple continuous slit nozzles 402 are arranged in a closed or semi-closed array, forming a geometrically defined pattern (such as rectangle, circle, or polygon) at the bottom of the pressure-stabilizing chamber 401. This arrangement ensures that the cold airflow from each nozzle is spatially interconnected, creating a continuous cold air curtain boundary and avoiding coverage blind spots caused by nozzle discontinuities. The width of the continuous slit nozzle 402 is much smaller than its length; this elongated structure facilitates the formation of a thin-sheet airflow pattern, resulting in a cold air curtain with good directionality and uniform coverage.

[0063] Guide vanes 403 are provided on both sides of the continuous slit nozzle 402. Each guide vane 403 is a thin, sheet-like structure extending outward from the nozzle edge, with a certain angle of inclination relative to the nozzle plane. The function of the guide vanes 403 is to guide the cold airflow exiting the nozzle in a preset direction, causing the cold airflow to spread outward at a certain diffusion angle. When the cold airflow exits the slit nozzle, it is guided by the guide vanes 403, causing the airflow direction to deflect and forming an outward-sloping flow trajectory. Multiple nozzles working in conjunction with the guide vanes 403 can form a large-area cold air curtain above the coating surface.

[0064] The pressure-stabilizing chamber 401 ensures the stability and uniformity of the cold air outflow, avoiding fluctuations in the cold air curtain caused by airflow pulses; the slender structure of the continuous slit nozzle 402 gives the cold air curtain a large coverage width and good directionality; the guide vane 403 allows the cold air to spread outward in a diffusion manner, expanding the coverage range of the cold air curtain; the enclosed nozzle array achieves multi-directional encirclement of the coating area, improving the VOCs suppression effect.

[0065] Preferably, a perforated flow equalization plate 404 is horizontally arranged inside the pressure stabilizing chamber 401. The flow equalization plate 404 is located between the air inlet and the slit nozzle, and multiple through holes are evenly distributed on the plate surface. After the cold air enters the pressure stabilizing chamber 401, it first passes through the flow equalization plate 404, is divided into multiple fine airflows by the through holes, and then remixed. This can further improve the uniformity of airflow distribution, eliminate local velocity differences caused by the air inlet direction, and make the air outlet velocity of each slit nozzle tend to be consistent.

[0066] In some embodiments, the continuous slit nozzle 402 has a width of 0.8 mm and a length of 120 mm. A slit nozzle with a width of 0.8 mm can generate a thin, high-velocity sheet-like airflow. An excessively large nozzle width leads to reduced airflow velocity, weakening the penetration and directionality of the cold air curtain, making it difficult to effectively cover the coating surface; an excessively small nozzle width increases airflow resistance, potentially causing turbulence and noise due to excessive airflow velocity, while also increasing processing difficulty and the risk of clogging. A nozzle with a length of 120 mm ensures the coverage width of the cold air curtain in a single direction. For shoe sole coating operations, the width of the coating area is typically around 100 mm. A nozzle length of 120 mm can completely cover the width of the coating area, achieving direct coverage without relying on airflow diffusion, thus increasing the effective area of ​​the cold air curtain. Multiple slit nozzles with a length of 120 mm arranged in a ring can form a circumferential enclosure of the coating area. The 0.8 mm nozzle width matches the working pressure of a conventional compressed air system, allowing for a suitable outlet air velocity under commonly used supply pressures; the 120 mm nozzle length is adapted to the typical width of shoe sole coating operations, achieving effective coverage without the need for additional expansion of the coverage area; the size parameters match the cold air output capacity of the vortex tube 10, avoiding waste of cold air or insufficient coverage due to improper nozzle size.

[0067] Preferably, the width of the continuous slit nozzle 402 can be adjusted according to the air supply pressure and the required coverage area of ​​the cold air curtain. For example, a replaceable sheet or adjustable baffle can be provided at the nozzle to adapt to the needs of different shoe sole sizes or different air supply conditions. The nozzle edge can be provided with rounded corners or streamlined transitions to reduce resistance loss and turbulence generation when the airflow passes through, thereby improving the laminar flow characteristics and coverage uniformity of the cold air curtain.

[0068] In some embodiments, the guide vane 403 causes the cold air curtain output from the continuous slit nozzle 402 to tilt outward at an angle of 15°±5° relative to the vertical direction. The guide vane 403 directs the cold airflow at this 15°±5° outward tilt angle, meaning the cold airflow is not sprayed vertically downwards, but rather deflected outwards at a certain angle relative to the vertical direction. The cold airflow from multiple nozzles deflects outwards, forming a shape similar to an umbrella rib unfolding outwards, i.e., an "inverted umbrella" cold air curtain. The selection of this angle range is based on a balance between flow field coverage and airflow retention capacity. If the angle is too small, the cold air curtain tends to be vertically downwards, with the coverage area concentrated directly below the nozzle, resulting in insufficient lateral coverage of the coating area; if the angle is too large, the cold airflow is too dispersed, and the flow velocity upon reaching the work surface is too low, making it difficult to achieve an effective suppressive effect. An angle of 15°±5° allows the cold airflow to have sufficient lateral diffusion range upon reaching the work surface while maintaining a certain downward velocity and impact force. The specific angle range of 15°±5° strikes a balance between coverage area and airflow velocity, ensuring sufficient coverage area while maintaining the ability of cold airflow to suppress VOCs.

[0069] In some embodiments, the cold air curtain generated by the cold curtain generating component 40 has a coverage area of ​​at least 60 cm³. A cold air curtain coverage area of ​​at least 60 cubic centimeters means that the effective working area formed by the cold air curtain above the adhesive application surface is not less than 60 cubic centimeters. This coverage area should be sufficient to cover the adhesive application area of ​​the glue gun 20. For shoe sole adhesive application, the adhesive application area is typically elongated or elliptical, with an area of ​​approximately 100 to 200 square centimeters. The coverage area and height corresponding to a 60 cubic centimeter coverage area are sufficient to completely cover the core adhesive application area, ensuring that VOCs are covered by the cold air curtain the moment they are generated. The outward tilting launch angle ensures that the cold air curtain covers an area larger than the nozzle itself when it reaches the work surface, achieving the effect of "small nozzle, large coverage"; the specific angle range of 15°±5° achieves a balance between coverage area and airflow speed, ensuring sufficient coverage area while maintaining the cold airflow's ability to suppress VOCs; the 60 cubic centimeter coverage area ensures that the core area of ​​the adhesive application is completely covered by the cold air curtain, with no blind spots.

[0070] Preferably, the angle of the guide vane 403 can be set to an adjustable structure. For example, the tilt angle of the guide vane 403 can be changed by means of hinge or thread adjustment, so that the operator can adjust the diffusion angle of the cold air curtain in real time according to different shoe types, different types of adhesives and different working distances, so as to match the actual size and shape of the adhesive application area and improve the adaptability of the device.

[0071] In some embodiments, the diameter of the heat compensation conduit 30 is 6 mm. The 6 mm diameter of the heat compensation conduit 30 matches the air inlet size of a conventional pneumatic glue gun 20, allowing direct connection to the atomizing air inlet 201 of the standard glue gun 20 without the need for additional adapters. An excessively large diameter may reduce the hot airflow velocity, increasing heat loss during transmission; an excessively small diameter increases airflow resistance, affecting the exhaust smoothness and pressure balance of the hot end outlet 102 of the vortex tube 10. A 6 mm diameter is the optimal value that balances sufficient hot airflow with flexibility in conduit layout and effective heat retention. The 6 mm diameter matches the standard glue gun 20's air inlet specifications, facilitating direct connection without the need for additional adapters.

[0072] In some embodiments, the atomizing air inlet 201 of the glue spray gun 20 is detachably and sealed to one end of the heat compensation pipeline 30. For example, a threaded connector, quick-connect connector, or compression fitting can be used for this connection. The advantages of this detachable connection are: firstly, it facilitates the assembly and disassembly of the device; when the glue spray gun 20 needs maintenance or replacement, the heat compensation pipeline 30 can be quickly separated from the glue spray gun 20; secondly, it facilitates the replacement of suitable connectors according to different glue spray gun 20 models; and thirdly, the sealed connection ensures that the hot airflow does not leak during transmission, preventing heat loss and compressed air waste.

[0073] In some embodiments, the heat compensation conduit 30 is made of high-temperature resistant sealing steel, such as stainless steel (e.g., 304 or 316L) or heat-resistant alloy steel. The temperature of the hot gas flow discharged from the hot end outlet 102 of the vortex tube 10 can reach 40 to 70 degrees Celsius, and may be higher under some operating conditions. Ordinary carbon steel is prone to oxidation and corrosion under long-term high temperature and compressed air (containing moisture and trace amounts of oil), affecting the sealing performance and service life of the conduit. High-temperature resistant sealing steel has good heat resistance and corrosion resistance, and can maintain stable mechanical and sealing properties in high-temperature and humid compressed air environments, ensuring that the hot gas flow is safely and leak-free delivered to the glue gun 20.

[0074] Preferably, a temperature indicator label or a patch-type temperature sensor can be installed on the outside of the heat compensation pipeline 30 to allow operators to intuitively understand the real-time temperature status of the heat compensation pipeline 30 and promptly detect abnormal heat loss or abnormal operation of the eddy current tube 10.

[0075] In some embodiments, the flexible universal conduit 50 is at least 200 mm long. Its function is to connect the cold end outlet 101 of the vortex tube 10 to the cold curtain generating assembly 40, allowing for a certain amount of relative positional adjustment space between the two. Since the cold curtain generating assembly 40 needs to be positioned above the working area of ​​the glue gun 20, while the vortex tube 10 is typically fixedly mounted on an equipment bracket or frame, a certain spatial distance and angular deviation exist between the two, necessitating a connection via a flexible conduit. A length of 200 mm or more provides sufficient bending allowance, enabling the cold curtain generating assembly 40 to be flexibly adjusted according to the working position and angle of the glue gun 20, without being limited by the conduit length. Simultaneously, the flexible conduit can absorb minor vibrations of the glue gun 20 during operation, preventing loosening of joints or pipe breakage caused by rigid connections.

[0076] In some embodiments, the flexible universal conduit 50 is made of polyvinyl chloride (PVC) or stainless steel corrugated tubing. PVC flexible conduits are lightweight, low-cost, and highly flexible, making them suitable for cost-sensitive applications and environments with relatively low operating temperatures. Stainless steel corrugated tubing is resistant to high and low temperatures, corrosion, and has high compressive strength, making it suitable for use in harsher environments. The corrugated structure allows it to maintain the flow of air in curved conditions, preventing airflow blockage due to bending.

[0077] Preferably, the flexible universal duct 50 can be equipped with quick-release connectors to connect to the cold end outlet 101 of the vortex tube 10 and the air inlet of the cold curtain generating assembly 40, respectively, facilitating quick assembly, disassembly, and maintenance of the device. The duct can be covered with an insulation layer to reduce the loss of cold air during transmission. Especially when the duct is long or passes through a high-temperature environment, the insulation layer can effectively maintain the temperature of the cold air and improve the suppression effect of the cold air curtain.

[0078] In some embodiments, an adjustment bracket is also included, which is disposed above the glue spray gun 20, and the cold curtain generating assembly 40 is disposed on the adjustment bracket. The adjustment bracket is a support structure used to fix and adjust the spatial position of the cold curtain generating assembly 40. The adjustment bracket is disposed above the glue spray gun 20 and can be connected to the body of the glue spray gun 20 or the fixed bracket of the glue spray gun 20 by means of clamping, bolting, or magnetic attraction. The cold curtain generating assembly 40 is mounted on the adjustment bracket, and the spatial position and posture of the cold curtain generating assembly 40 relative to the glue spray gun 20 can be changed by adjusting the bracket. The adjustment bracket can realize multiple adjustment functions: first, height adjustment, so that the cold curtain generating assembly 40 can be raised and lowered according to the height change of the glue application surface to maintain the optimal distance between the cold air curtain and the application surface; second, horizontal position adjustment, so that the center of the cold curtain generating assembly 40 is aligned with the center of the glue application area; third, angle adjustment, so that the emission direction of the cold air curtain forms a suitable angle with the glue application surface. The adjustment bracket can achieve the above-mentioned adjustment function using structures such as sliding grooves and locking screws, linkage mechanisms, or universal joints. The adjustment bracket allows the cold curtain generating component 40 to be flexibly adjusted according to different shoe types, different glue application positions, and different working heights, improving the versatility and adaptability of the device. The adjustment bracket integrates the cold curtain generating component 40 and the glue spray gun 20 into one unit, allowing both to move together, ensuring that the cold air curtain always covers the glue application area, eliminating the need to adjust the cold curtain generating component 40 separately after each adjustment of the glue spray gun 20 position.

[0079] Preferably, the adjustment bracket can be equipped with a scale or angle indicator, enabling operators to quickly and accurately record and reproduce the optimal position parameters under different operating conditions, reducing debugging time and improving changeover efficiency. The adjustment bracket can adopt a pneumatic or electric driven automatic adjustment method, linked with the control system, and automatically adjust the position of the cold curtain generating component 40 as the glue spray gun 20 moves.

[0080] In some embodiments, the outer side of the heat compensation pipe 30 is wrapped with a heat insulation layer, the thickness of which is not less than 5 mm. The heat insulation layer is a thermal insulation material layer wrapped around the outside of the heat compensation pipe 30, its function being to reduce heat loss during the transmission of hot air. If the hot air discharged from the hot end outlet 102 of the vortex tube 10 is exposed to air during its transmission through the heat compensation pipe 30 to the glue gun 20, heat will be lost to the surrounding environment through convection and radiation, resulting in the airflow temperature reaching the atomization inlet 201 of the glue gun 20 being lower than the temperature of the hot end outlet 102 of the vortex tube 10, affecting the temperature control effect. The thickness of the heat insulation layer is not less than 5 mm, which provides sufficient thermal resistance to reduce heat loss. Various thermal insulation materials can be used for the heat insulation layer, such as asbestos, fiberglass wool, aluminum silicate fiber, or rubber and plastic insulation materials. Asbestos possesses excellent heat resistance and insulation properties; glass fiber insulation offers good insulation performance at a lower cost; aluminum silicate fiber exhibits superior temperature resistance, making it suitable for high-temperature applications; and rubber-plastic insulation materials are flexible and easily wrap around curved pipes. The insulation layer can be installed using a sleeve type (fitting a pre-formed insulation pipe onto the heat compensation pipe 30), a wrapping type (wrapping insulation tape around the pipe and securing it with cable ties), or a spraying type (spraying insulation material onto the pipe surface to form a coating). An additional protective layer (such as aluminum foil or a plastic sheath) can be applied to the outside of the insulation layer to prevent moisture, wear, or detachment. The insulation layer effectively reduces heat loss during transmission, ensuring that the airflow temperature reaching the spray gun 20 meets temperature control requirements; a thickness of 5 mm or more strikes a balance between insulation performance and pipe flexibility, ensuring sufficient insulation without making the pipe too rigid; the selection of insulation materials can be optimized based on actual operating temperature, cost, and ease of installation.

[0081] Preferably, the insulation layer can adopt a composite structure, with the inner layer being high-temperature resistant ceramic fiber paper or aerogel felt, and the outer layer being a flexible rubber and plastic insulation material. The combination of the inner and outer layers can simultaneously meet the requirements of high-temperature resistance and flexible covering. A reflective aluminum foil layer can be set on the outer surface of the insulation layer to further reduce heat radiation dissipation, while also facilitating cleaning and marking of pipeline routes.

[0082] Finally, it should be noted that although the above embodiments have been described in the text and drawings of this application, this should not limit the scope of patent protection of this application. Any technical solutions that are based on the essential concept of this application and utilize the content described in the text and drawings of this application, resulting in equivalent structural or procedural substitutions or modifications, as well as the direct or indirect application of the technical solutions of the above embodiments to other related technical fields, are all included within the scope of patent protection of this application.

Claims

1. A temperature control and environmentally friendly pressing device for shoe adhesive spraying based on the bidirectional utilization of vortex tubes for both hot and cold heat, characterized in that, include: A vortex tube, wherein the two ends of the vortex tube are respectively provided with a cold end outlet and a hot end outlet, and the side wall of the vortex tube is provided with a compressed air inlet; A glue spray gun, the glue spray gun including an atomizing air inlet, the atomizing air inlet being connected to the hot end outlet through a heat compensation pipeline; as well as A cold curtain generating component, wherein the air inlet of the cold curtain generating component is connected to the cold end outlet through a flexible universal duct, and the cold curtain generating component is disposed above the working area of ​​the glue spray gun.

2. The shoe-making adhesive spraying temperature control and environmentally friendly pressing device based on the bidirectional utilization of hot and cold water using vortex tubes as described in claim 1, characterized in that, The cold curtain generating assembly includes a pressure stabilizing chamber, and the bottom of the pressure stabilizing chamber is provided with a plurality of outwardly and downwardly inclined continuous slit nozzles. The plurality of continuous slit nozzles are arranged in a surrounding manner, and guide vanes are provided on both sides of the continuous slit nozzles.

3. The shoe-making adhesive spraying temperature control and environmentally friendly pressing device based on the bidirectional utilization of hot and cold water in vortex tubes according to claim 2, characterized in that, The width of the continuous slit nozzle is 0.8 mm, and the length is 120 mm; and / or The outlet air velocity of the continuous slit nozzle is set to 8-12 m / s.

4. The shoe-making adhesive spraying temperature control and environmentally friendly pressing device based on the bidirectional utilization of hot and cold water using vortex tubes as described in claim 2, characterized in that, The guide vanes cause the cold air curtain output through the continuous slit nozzles to tilt outward at an angle of 15°±5° relative to the vertical direction; and / or The cold air curtain generated by the cold curtain generating component has a coverage area of ​​at least 60cm. 3 .

5. The shoe-making adhesive spraying temperature control and environmentally friendly pressing device based on the bidirectional utilization of hot and cold water using vortex tubes as described in claim 1, characterized in that, The diameter of the heat compensation pipeline is 6 mm; and / or The atomizing air inlet of the glue spray gun is detachably and sealed to one end of the heat compensation pipeline; and / or The thermal compensation pipeline is made of high-temperature resistant sealing steel.

6. The shoe-making adhesive spraying temperature control and environmentally friendly pressing device based on the bidirectional utilization of hot and cold water in vortex tubes according to claim 1, characterized in that, The length of the flexible universal conduit is at least 200 mm; and / or The flexible universal conduit is made of polyvinyl chloride or stainless steel corrugated pipe.

7. The shoe-making adhesive spraying temperature control and environmentally friendly pressing device based on the bidirectional utilization of hot and cold water using vortex tubes as described in claim 1, characterized in that, It also includes an adjustment bracket, which is positioned above the glue spray gun, and the cold curtain generating component is positioned on the adjustment bracket.

8. The shoe-making adhesive spraying temperature control and environmentally friendly pressing device based on the bidirectional utilization of hot and cold water using vortex tubes as described in claim 1, characterized in that, The outer side of the heat compensation pipeline is wrapped with a heat insulation layer, and the thickness of the heat insulation layer is not less than 5mm.

9. A shoe-making adhesive spraying temperature control and environmentally friendly pressing device based on the bidirectional utilization of hot and cold water using vortex tubes, as described in claim 2, is characterized in that... It also includes a flow equalization plate, which is horizontally disposed inside the pressure stabilizing chamber.

10. The shoe-making adhesive spraying temperature control and environmentally friendly pressing device based on the bidirectional utilization of hot and cold water using vortex tubes as described in claim 1, characterized in that, The inlet pressure of the vortex tube is set to 0.4-0.6 MPa; and / or The temperature range of the cold end outlet of the vortex tube is set to -5℃ to 0℃.

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