Hot air cold riveting nozzle mechanism

Abstract

The utility model relates to a hot -blast cold riveting nozzle mechanism, including flow guide main part, flow guide head and elastic part: the inside of flow guide main part is equipped with hot -blast channel, flow guide head with flow guide main part air outlet one end swing joint, be equipped with at least one for discharging hot -blast inclined air outlet hole on the lateral wall of flow guide head, elastic part is located between flow guide main part and flow guide head, and the elastic part plays the role of elastic buffer when flow guide head contacts work piece. The utility model has the beneficial effect that can effectively avoid the risk of mechanical stress and thermal stress damage, improve the flexibility and stability of hot -blast cold riveting process application.

Description

Technical Field

[0001] This utility model relates to the field of hot air cold riveting technology, and specifically to a hot air cold riveting nozzle mechanism. Background Technology

[0002] Hot air cold riveting is an advanced plastic joining technology that heats only the rivet part that needs to be deformed, making it easier to shape, while avoiding excessive heat conduction to the base material workpiece being joined. Hot air refers to the use of high-speed, high-temperature hot air flow during the riveting process to precisely and locally heat the upset head part of the rivet. Then, immediately use a room-temperature riveting head to forge and rivet the softened upset head, so that it forms an interference fit upset head on the surface of the composite material component.

[0003] In this process, "cold" has a dual meaning: first, it refers to the riveting tool head being kept at room temperature, distinguishing it from "hot riveting"; second, it refers to the rivet shank and rivet hole area, clamped inside the brittle composite material plate. Due to the poor thermal conductivity of the composite material itself, and with insulation measures incorporated into the process design, a relatively low temperature can be maintained throughout the riveting process, effectively preventing thermal damage to the composite matrix caused by heat conduction. This ingenious "local heating, overall cold riveting" technical approach has successfully solved the long-standing industry challenge of achieving high-quality, high-reliability interference fit connections between brittle composite materials (such as carbon fiber reinforced resin matrix composites) and high-strength rivets, and has become an indispensable key connection technology in the manufacturing of high-end equipment such as aerospace vehicles.

[0004] However, in the current implementation of hot air cold riveting, the end-effector, namely the hot air nozzle, still faces the following prominent technical bottlenecks in practical applications: First, the risk of mechanical stress damage: For accurate positioning, the nozzle usually needs to contact or be very close to the workpiece surface. Existing rigid nozzles are prone to scratching or micro-indentation on the smooth and fragile surface of the composite material during contact or micro-pressure, introducing unnecessary mechanical stress concentration points. Second, the risk of thermal stress damage: After the hot air heats the rivet head, if it cannot be effectively constrained and guided, it will diffuse randomly in all directions. This not only leads to temperature instability and affects softening, but the overflowing high-temperature airflow will also bake the precision electronic components, structural adhesive layers, or thin-walled shells around the workpiece, causing irreversible thermal stress damage or even functional failure. In addition, due to the above-mentioned damage risks, existing devices are often extremely sensitive to the local shape of the workpiece and the layout spacing of surrounding components, requiring complex alignment and avoidance designs, which limits the flexibility and stability of this process in complex and compact parts. Utility Model Content

[0005] The purpose of this invention is to provide a hot air cold riveting nozzle mechanism that can effectively avoid the risk of damage from mechanical stress and thermal stress, and improve the flexibility and stability of hot air cold riveting process.

[0006] A hot air cold riveting nozzle mechanism, comprising: The main airflow guide body has a hot air channel inside; A guide head is movably connected to one end of the guide body for air outlet, and at least one oblique air outlet hole for discharging hot air is provided on the side wall of the guide head. An elastic element is disposed between the flow guide body and the flow guide head, and the elastic element plays an elastic buffering role when the flow guide head contacts the workpiece.

[0007] In the above solution, by setting an elastic element between the guide body and the guide head, the guide head has an elastic buffer function when contacting the workpiece. Compared with the existing rigid nozzles, this effectively avoids scratches or micro-indentations on the surface of the composite material matrix, reduces the generation of mechanical stress concentration points, and improves the surface quality and structural integrity of the composite material components. The design of the oblique air outlet effectively constrains and guides the hot air, preventing excessive hot air from spreading disorderly in all directions when heating the rivet head. This not only ensures temperature stability, thus helping to stabilize and soften the rivet, but also prevents the overflowing high-temperature airflow from causing thermal stress damage to the precision electronic components, structural adhesive layers, or thin-walled shells around the workpiece, ensuring the normal function and service life of these components. Due to the reduced risk of mechanical stress and thermal stress damage, the hot air cold riveting nozzle mechanism is less sensitive to the local shape of the workpiece and the layout spacing of surrounding components, reducing the complex alignment and avoidance design requirements. This allows the hot air cold riveting process to be applied more flexibly to the connection of complex and compact components, improving the adaptability and stability of the process in actual production.

[0008] Furthermore, it also includes a limiting component, which includes at least two limiting blocks. One end of each limiting block is connected to the flow guide body, and the other end is in movable contact with the outer wall of the flow guide head.

[0009] In the above scheme, one end of the limiting block is connected to the guide body, and the other end is in contact with the outer wall of the guide head. When the guide head contacts the workpiece and the elastic element undergoes compression deformation to play an elastic buffering role, the limiting block can precisely constrain the movement of the guide head. It can prevent the guide head from excessively deviating or shaking under the action of the elastic element, ensuring that the guide head always moves in a buffering direction perpendicular to the workpiece surface, making the elastic buffering function more stable and reliable, thereby reducing the risk of mechanical damage to the workpiece surface. At the same time, the limiting block can enhance the stability of the connection between the guide body and the guide head, so that the entire nozzle mechanism maintains the structural integrity in a complex mechanical environment, avoiding loosening or misalignment of the connection between the guide head and the guide body due to external forces, thereby ensuring the normal transmission and discharge of hot air.

[0010] Furthermore, the guide head is provided with at least two grooves, and the sliding part of the limiting block is in movable contact with the grooves.

[0011] In the above scheme, when the guide head contacts the workpiece and the elastic element begins to compress to achieve elastic buffering, the sliding part of the limiting block slides in the groove. The groove guides the sliding part, ensuring that the guide head smoothly approaches the workpiece along a specific straight line, avoiding lateral deviation or shaking of the guide head during the buffering process. This makes the contact between the guide head and the workpiece surface more uniform and stable, effectively reducing the risk of mechanical damage to the workpiece surface due to uneven contact and improving the surface quality of the composite material component.

[0012] Furthermore, the limiting block is provided with a connecting hole, and the flow guiding body is provided with a threaded hole corresponding to the connecting hole. The limiting block and the flow guiding body are connected by fasteners.

[0013] In the above solution, the limiting block is firmly connected to the guide body by fasteners, which ensures that the limiting block will not loosen or shift during operation. During hot air cold riveting, the mechanism will be affected by various external forces such as the force generated by the hot air flow and the impact force of the riveting process. This reliable connection method ensures that the limiting block is always in the correct position, can continuously play the role of limiting the guide head, maintain the stability of the entire mechanism structure, and avoid the guide head from shifting due to the loosening of the limiting block, thereby affecting the riveting quality.

[0014] Furthermore, when the limiting component includes two limiting blocks, the two limiting blocks are symmetrically arranged along the central axis of the flow guide body.

[0015] In the above scheme, during the process of the guide head contacting the workpiece and compressing the elastic element for buffering, a reaction force is generated. The two symmetrically arranged limiting blocks can evenly bear and disperse these forces, avoiding the guide head tilting or shaking due to uneven force. This allows the guide head to remain stable throughout the buffering process and approach the workpiece surface vertically along the central axis, effectively reducing the risk of mechanical damage to the workpiece surface and ensuring the integrity of the composite material matrix surface.

[0016] Furthermore, the angle between the central axis of the oblique air outlet and the central axis of the guide head is an acute angle.

[0017] In the above scheme, after the hot air reaches the guide head, it is guided to the surface of the base material. Then, the hot air bounces back and is discharged through the angled air outlet. The angle between the central axis of the angled air outlet and the central axis of the guide head is acute, and the hot air is discharged obliquely upward. This prevents thermal stress damage to the base material, its internal precision components such as circuits and sensors, as well as the outer shell and coating adhesive. The heated area is limited to the rivet area, thus stabilizing and softening the workpiece. The small heated area and the angled air outlet result in a low product temperature. When conducting temperature tests, the overall product temperature is stable and within a reasonable range, and abnormal temperature fluctuations will not interfere with the test results, ensuring that the temperature test is not affected.

[0018] Furthermore, the central axis of the oblique air outlet forms a 45° angle with the central axis of the guide head.

[0019] In the above solution, the 45° angled air outlet allows the rebounding hot air to be discharged obliquely upward, which will not directly impact the base material and its internal precision components such as circuits and sensors. This reduces the risk of local overheating and thermal stress, prevents thermal deformation and thermal cracking of the base material, and prevents performance degradation, parameter drift or damage of precision components due to thermal stress, thus ensuring the performance and lifespan of the base material and components.

[0020] Furthermore, the flow guide body includes a cylindrical main body and a head. The main body is movably inserted into the flow guide head. The elastic element is sleeved on the main body. One end of the elastic element abuts against the head, and the other end abuts against the flow guide head.

[0021] In the above scheme, during the operation of the nozzle mechanism, the main body of the guide body is movably inserted into the guide head, and the elastic element is sleeved on the main body. One end of the elastic element abuts against the head, and the other end abuts against the guide head, which can play an elastic buffering role. When the guide head contacts the surface of the base material, the elastic element will undergo elastic deformation, avoiding rigid collision between the guide head and the wood. This avoids scratches or micro-indentations on the smooth and fragile surface of the composite material base material caused by existing rigid nozzles during contact or micro-pressure, and prevents the introduction of unnecessary mechanical stress concentration points.

[0022] Furthermore, the elastic element is a titanium alloy spring.

[0023] In the above solution, titanium alloy springs have excellent high-temperature resistance, maintaining stable elasticity and mechanical properties in high-temperature environments. They also have excellent corrosion resistance, resisting the erosion of various chemicals and effectively preventing the springs from being corroded and damaged. In environments with strong magnetic fields, ordinary ferromagnetic springs are attracted by the magnetic field, causing the spring position to shift or generating additional stress, affecting the normal operation of the equipment. Titanium alloy springs, being paramagnetic, are not attracted by magnetic fields and can maintain their stability and performance in strong magnetic field environments, avoiding interference from magnetic fields on elastic components and ensuring the normal operation of the equipment in magnetic field environments.

[0024] Furthermore, the limiting block is made of stainless steel.

[0025] In the above scheme, the hot air cold riveting process generates high temperatures. The limiting block made of ordinary materials may deform or be damaged due to high temperatures. Stainless steel has good high temperature resistance and can maintain stable performance in high temperature environments. It will not lose its limiting function due to temperature rise. This ensures that the limiting block can work normally throughout the hot air cold riveting process and maintain the stability of the riveting process.

[0026] Compared with the prior art, the hot air cold riveting nozzle mechanism of this utility model has the following beneficial effects: First, it can effectively avoid the risk of mechanical damage. By setting an elastic element between the guide body and the guide head, the guide head has an elastic buffer function when it contacts the workpiece. Compared with the existing rigid nozzles, it effectively avoids scratches or micro-indentations on the surface of the composite material matrix, reduces the generation of mechanical stress concentration points, and improves the surface quality and structural integrity of composite material components. Second, it can effectively avoid thermal stress damage. The design of the slanted air outlet effectively constrains and guides the hot air, preventing excessive hot air from spreading disorderly in all directions when heating the rivet head. This not only ensures temperature stability, which helps to stabilize and soften the rivet, but also prevents the overflowing high-temperature airflow from causing thermal stress damage to the precision electronic components, structural adhesive layers, or thin-walled shells around the workpiece, ensuring the normal function and service life of these components. Third, by reducing the risk of mechanical and thermal stress damage, the hot air cold riveting nozzle mechanism is less sensitive to the local shape of the workpiece and the layout spacing of surrounding components, reducing the complex alignment and avoidance design requirements. This allows the hot air cold riveting process to be applied more flexibly to the connection of complex and compact parts, improving the adaptability and stability of the process in actual production. Attached Figure Description

[0027] Figure 1 This is a perspective view of a hot air cold riveting nozzle mechanism according to one embodiment.

[0028] Figure 2 This is an exploded view of a hot air cold riveting nozzle mechanism according to one embodiment.

[0029] Figure 3 This is a plan view of a hot air cold riveting nozzle mechanism according to one embodiment.

[0030] The reference numerals in the attached figures are as follows: 1. Guide body; 11. Head; 12. Main body; 2. Guide head; 22. Slide groove; 3. Angled air outlet; 4. Elastic element; 5. Limiting component; 51. Limiting block; 511. Sliding part; 6. Threaded hole; 7. Fastener. Detailed Implementation

[0031] The following will describe in further detail a hot air cold riveting nozzle mechanism of the present invention with reference to specific embodiments and accompanying drawings.

[0032] like Figures 1 to 3 As shown in a preferred embodiment, the hot air cold riveting nozzle mechanism of this utility model includes a guide body 1, a guide head, and an elastic element 4: the guide body 1 has a hot air channel inside; the guide head is movably connected to the air outlet end of the guide body 1, and at least one oblique air outlet 3 for discharging hot air is provided on the side wall of the guide head; the elastic element 4 is disposed between the guide body 1 and the guide head, and plays an elastic buffering role when the guide head contacts the workpiece. By setting the elastic element 4 between the guide body 1 and the guide head, the guide head has an elastic buffering function when contacting the workpiece. Compared with the existing rigid nozzles, this effectively avoids scratches or micro-indentations on the surface of the composite material matrix, reduces the generation of mechanical stress concentration points, and improves the surface quality and structural integrity of the composite material components. The design of the angled air outlet 3 effectively constrains and guides the hot air, preventing excessive hot air from spreading disorderly to the surroundings after heating the rivet head. This not only ensures temperature stability, thus helping to stabilize and soften the rivet, but also prevents the overflowing high-temperature airflow from causing thermal stress damage to the precision electronic components, structural adhesive layers, or thin-walled shells around the workpiece, ensuring the normal function and service life of these components. In addition, by reducing the risk of mechanical and thermal stress damage, the hot air cold riveting nozzle mechanism is less sensitive to the local shape of the workpiece and the layout spacing of surrounding components, reducing the complex alignment and avoidance design requirements. This allows the hot air cold riveting process to be applied more flexibly to the connection of complex and compact parts, improving the adaptability and stability of the process in actual production, thereby improving the stability and quality of product processing.

[0033] like Figure 1 and Figure 2As shown, in some embodiments, a limiting component 5 is also included. The limiting component 5 includes at least two limiting blocks 51. One end of the limiting block 51 is connected to the flow guide body 1, and the other end is in movable contact with the outer wall of the flow guide head. When the flow guide head contacts the workpiece and the elastic element 4 undergoes compression deformation to provide elastic buffering, the limiting block 51 can precisely constrain the movement of the flow guide head. It can prevent the flow guide head from excessively deviating or shaking under the action of the elastic element 4, ensuring that the flow guide head always moves in a direction perpendicular to the workpiece surface, making the elastic buffering function more stable and reliable, thereby reducing the risk of mechanical damage to the workpiece surface. At the same time, the limiting block 51 can enhance the stability of the connection between the flow guide body 1 and the flow guide head, so that the entire nozzle mechanism maintains the structural integrity in a complex mechanical environment, avoiding loosening or misalignment of the connection between the flow guide head and the flow guide body 1 due to external forces, thereby ensuring the normal transmission and discharge of hot air.

[0034] like Figure 1 and Figure 2 As shown, in some embodiments, the guide head is provided with at least two grooves 22, and the sliding part 511 of the limiting block 51 is in movable contact with the groove 22. When the guide head contacts the workpiece, the elastic element 4 begins to compress to achieve elastic buffering, the sliding part 511 of the limiting block 51 slides in the groove 22. The groove 22 guides the sliding part 511, ensuring that the guide head smoothly approaches the workpiece along a specific straight direction, avoiding lateral deviation or shaking of the guide head during the buffering process. This makes the contact between the guide head and the workpiece surface more uniform and stable, effectively reducing the risk of mechanical damage to the workpiece surface due to uneven contact and improving the surface quality of the composite material component.

[0035] like Figure 1 and Figure 2 As shown, in some embodiments, the limiting block 51 is provided with a connecting hole, and the flow guide body 1 is provided with a threaded hole 6 corresponding to the connecting hole. The limiting block 51 and the flow guide body 1 are connected by a fastener 7. By having the fastener 7 pass through the connecting hole and be threadedly connected to the threaded hole, the limiting block 51 and the flow guide body 1 are firmly connected. This ensures that the limiting block 51 will not loosen or shift during operation. During hot air cold riveting, the mechanism is affected by various external forces such as the force generated by the hot air flow and the impact force of the riveting process. This reliable connection method ensures that the limiting block 51 is always in the correct position, can continuously play the role of limiting the flow guide head, maintain the stability of the entire mechanism structure, and avoid the flow guide head from shifting due to the loosening of the limiting block 51, thereby affecting the riveting quality.

[0036] like Figure 1 and Figure 2As shown, in some embodiments, when the limiting component 5 includes two limiting blocks 51, the two limiting blocks 51 are symmetrically arranged along the central axis of the guide body 1. During the process of the guide head contacting the workpiece and compressing the elastic element 4 for buffering, a reaction force is generated. The two symmetrically arranged limiting blocks 51 can evenly bear and disperse these forces, avoiding tilting or shaking of the guide head due to uneven force. This allows the guide head to remain stable throughout the buffering process, approaching the workpiece surface vertically along the central axis, effectively reducing the risk of mechanical damage to the workpiece surface and ensuring the integrity of the composite material matrix surface.

[0037] like Figure 1 and Figure 2 As shown, in some embodiments, the angle between the central axis of the oblique air outlet 3 and the central axis of the guide head is an acute angle. After the hot air reaches the guide head, it is guided to the surface of the base material. Then, the hot air is bounced off the wood and discharged through the oblique air outlet 3. The angle between the central axis of the oblique air outlet 3 and the central axis of the guide head is an acute angle, and the hot air is discharged obliquely upward, thereby avoiding thermal stress damage to the base material, internal precision components such as circuits and sensors on the base material, as well as the outer shell and coating adhesive. In this way, the heated area is only within the rivet area and the temperature is stable, which can stably soften the workpiece. The small heated area and the setting of the oblique air outlet 3 result in a low product heating temperature. When conducting temperature tests, since the overall temperature of the product is stable and within a reasonable range, abnormal temperature fluctuations will not interfere with the test results, ensuring that the temperature test is not affected.

[0038] like Figure 1 and Figure 2 As shown, in some embodiments, the central axis of the oblique air outlet 3 forms a 45° angle with the central axis of the guide head. The 45° angled oblique air outlet 3 causes the rebounding hot air to be discharged obliquely upward, which will not directly impact the base material and its internal precision components such as circuits and sensors. This reduces the risk of local overheating and thermal stress, prevents thermal deformation and thermal cracking of the base material, and prevents performance degradation, parameter drift or damage of precision components due to thermal stress, thus ensuring the performance and lifespan of the base material and components.

[0039] like Figures 1 to 3As shown, in some embodiments, the flow guiding body 1 includes a cylindrical main body 12 and a head 11. The main body 12 is movably inserted into the flow guiding head, and an elastic element 4 is sleeved on the main body 12. One end of the elastic element 4 abuts against the head 11, and the other end abuts against the flow guiding head. During the operation of the nozzle mechanism, the main body 12 of the flow guiding body 1 is movably inserted into the flow guiding head, and the elastic element 4 is sleeved on the main body 12. One end of the elastic element 4 abuts against the head 11, and the other end abuts against the flow guiding head, which can play an elastic buffering role. When the flow guiding head contacts the surface of the base material, the elastic element 4 will undergo elastic deformation, avoiding rigid collision between the flow guiding head and the wood. This avoids scratches or micro-indentations on the smooth and fragile surface of the composite material base material caused by existing rigid nozzles during contact or micro-pressure, and prevents the introduction of unnecessary mechanical stress concentration points.

[0040] like Figure 2 As shown, in some embodiments, the elastic element 4 is a titanium alloy spring. Titanium alloy springs have excellent high-temperature resistance, maintaining stable elasticity and mechanical properties in high-temperature environments. They also possess excellent corrosion resistance, resisting the erosion of various chemicals and effectively preventing corrosion damage. In environments with strong magnetic fields, ordinary ferromagnetic springs are attracted by the magnetic field, causing spring position displacement or additional stress, affecting the normal operation of the equipment. Titanium alloy springs, being paramagnetic, are not attracted by magnetic fields and can maintain their stability and performance in strong magnetic field environments, avoiding interference from the magnetic field on the elastic element 4 and ensuring the normal operation of the equipment in magnetic field environments.

[0041] like Figure 2 As shown, in some embodiments, the limiting block 51 is made of stainless steel. The hot air cold riveting process generates high temperatures, and the limiting block 51 made of ordinary materials may deform or be damaged due to the high temperature. Stainless steel has excellent high-temperature resistance and can maintain stable performance in high-temperature environments, without losing its limiting function due to temperature increases. This ensures that the limiting block 51 can always work normally throughout the entire hot air cold riveting process, maintaining the stability of the riveting process.

[0042] The working principle and process of a hot air cold riveting nozzle mechanism of this utility model are as follows: hot air flows in from the hot air channel of the guide body 1. The hot air channel provides a transmission path for the hot air, ensuring that the hot air can flow smoothly in the direction of the guide head. When the guide head contacts the surface of the base material, the elastic element 4 is compressed because it is set between the guide body 1 and the guide head. This elastic buffering effect avoids scratches or micro-indentations on the smooth and fragile surface of the composite material base material during the contact or micro-pressure process of existing rigid nozzles, and prevents the introduction of unnecessary mechanical stress concentration points. At the same time, the guide head can fit well with the surface of the workpiece under the elastic action, ensuring the stability of the subsequent riveting process. After the hot air reaches the guide head, it is guided to the surface of the base material. The hot air is bounced back. The side wall of the guide head is provided with at least one oblique air outlet 3. The bounced hot air is discharged through these oblique air outlets 3. This design can discharge excess hot air and prevent the hot air from spreading disorderly in all directions when heating the rivet head. This stabilizes the temperature of the rivet head and the surrounding area, allowing the rivet head to maintain a suitable softened state for subsequent riveting operations. At the same time, it also prevents the overflowing high-temperature airflow from causing thermal stress damage to the precision electronic components, structural adhesive layers, or thin-walled shells around the workpiece, ensuring the normal function and service life of these components.

[0043] In the description of this utility model, it should be understood that terms such as "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0044] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0045] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0046] Although the description of this utility model has been given in conjunction with the specific embodiments described above, it is obvious to those skilled in the art that many substitutions, modifications, and variations can be made based on the above description. Therefore, all such substitutions, modifications, and variations are included within the spirit and scope of the appended claims.

Claims

1. A hot air cold riveting nozzle mechanism, characterized in that, include: The main airflow guide body has a hot air channel inside; A guide head is movably connected to one end of the guide body for air outlet, and at least one oblique air outlet hole for discharging hot air is provided on the side wall of the guide head. An elastic element is disposed between the flow guide body and the flow guide head, and the elastic element plays an elastic buffering role when the flow guide head contacts the workpiece.

2. The hot air cold riveting nozzle mechanism according to claim 1, characterized in that, It also includes a limiting component, which includes at least two limiting blocks. One end of each limiting block is connected to the flow guide body, and the other end is in contact with the outer wall of the flow guide head.

3. The hot air cold riveting nozzle mechanism according to claim 2, characterized in that, The guide head is provided with at least two sliding grooves, and the sliding part of the limiting block is in movable contact with the sliding grooves.

4. The hot air cold riveting nozzle mechanism according to claim 2, characterized in that, The limiting block is provided with a connecting hole, and the flow guiding body is provided with a threaded hole corresponding to the connecting hole. The limiting block and the flow guiding body are connected by fasteners.

5. The hot air cold riveting nozzle mechanism according to claim 2, characterized in that, When the limiting component includes two limiting blocks, the two limiting blocks are symmetrically arranged along the central axis of the flow guide body.

6. The hot air cold riveting nozzle mechanism according to claim 1, characterized in that, The angle between the central axis of the oblique air outlet and the central axis of the guide head is an acute angle.

7. The hot air cold riveting nozzle mechanism according to claim 6, characterized in that, The central axis of the oblique air outlet forms a 45° angle with the central axis of the guide head.

8. The hot air cold riveting nozzle mechanism according to claim 1, characterized in that, The flow guide body includes a cylindrical main body and a head. The main body is movably inserted into the flow guide head. The elastic element is sleeved on the main body. One end of the elastic element abuts against the head, and the other end abuts against the flow guide head.

9. The hot air cold riveting nozzle mechanism according to claim 1, characterized in that, The elastic element is a titanium alloy spring.

10. The hot air cold riveting nozzle mechanism according to claim 2, characterized in that, The limiting block is made of stainless steel.

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