Automobile armrest box riveting device

Abstract

The application relates to the riveting technical field and discloses an automobile handrail box riveting device, which comprises a hot riveting machine body, a hydraulic cylinder is fixedly installed on the hot riveting machine body, an installation plate for placing a handrail box shell is also fixedly installed on the hot riveting machine body, a cavity is arranged in the inner wall of the installation shell, a water inlet pipe and a water outlet pipe which are in communication with the cavity are fixedly installed on the outer side of the installation shell, after hot pressure forming is completed, a circulating water pump is started, low-temperature cooling water in a cooling box is transported into the cavity of the installation shell through a connecting pipe, an elastic pipe and the water inlet pipe, in the circulating flow process of the cooling water in the cavity, efficient heat exchange occurs between the metal wall surface of the installation shell and a metal rivet head body, heat in the metal rivet head is rapidly taken away, the cooling water after temperature rise is returned to the cooling box through the water outlet pipe, the elastic pipe and a water conveying pipe to be cooled and lowered in temperature, and defects such as wire drawing and pitting caused by melt adhesion are eliminated.

Description

Technical Field

[0001] This invention relates to the field of riveting technology, specifically to a riveting device for an automotive armrest box. Background Technology

[0002] As an important functional and decorative component in the cockpit, the car armrest box is usually composed of multiple injection-molded parts such as the armrest box cover, lower shell, and internal frame. In order to obtain good appearance quality and structural strength, the various plastic parts need to be connected and fixed by a hot riveting process. The basic principle of hot riveting is as follows: the metal rivet head is heated to a set temperature by a heating element, and the rivet head is driven down by a cylinder or hydraulic cylinder to directly contact the plastic rivet post and apply pressure to it. The plastic softens and melts under the combined action of heat and pressure. The material flows in the pre-set forming cavity on the working end face of the rivet head and is reshaped into the rivet head. After cooling and solidification, the various parts are riveted into a whole.

[0003] In existing hot riveting equipment, in order to achieve batch processing of armrest boxes, a placement plate for mounting fixtures is usually configured. The various components of the armrest box are positioned and fixed on the placement plate by the fixtures. The hydraulic cylinder or air cylinder above the equipment drives the metal riveting head to descend vertically. An electric heating tube is embedded inside the riveting head to achieve continuous heating. The working end face of the riveting head is machined with a forming cavity that matches the shape of the target riveting head, usually hemispherical. During hot riveting, the heated end face of the riveting head directly contacts the plastic rivet post of the armrest box and heat-presses it into a riveting head. After cooling, the riveting head rises and resets, completing one riveting cycle.

[0004] However, the aforementioned hot riveting process has revealed a long-standing technical problem in actual production: after hot pressing, because the plastic rivet post has been heated to a molten state, when the metal rivet head detaches from the formed rivet head, the softened plastic melt easily adheres to the inner wall of the forming cavity at the lower end of the rivet head. With the increase in the number of riveting cycles, plastic residue gradually accumulates and carbonizes in the cavity, not only causing surface defects such as wire drawing and pitting on the rivet head surface of subsequent riveting, but also changing the effective volume of the forming cavity, resulting in poor dimensional consistency of the rivet head and seriously affecting the riveting quality. To alleviate this problem, the current... In some technologies, a conduit is usually installed on one side of the metal rivet head. After the rivet head is hot-pressed, room-temperature compressed air is continuously blown into the rivet point area in order to accelerate the cooling and solidification of the plastic melt through forced convection and reduce adhesion. However, since the specific heat capacity of compressed air is low and the airflow only acts on the outer surface of the rivet head, the heat transfer efficiency is limited. It is difficult to cool the plastic melt on the end face of the rivet head and in the molding cavity to below the glass transition temperature in a short time. The cooling effect is not ideal. Moreover, after the melt solidifies, it directly adheres to the inner wall of the cavity and detaches after cooling, which can easily damage the molded rivet head. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a riveting device for automotive armrest boxes, thus solving the aforementioned problems.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a riveting device for an automotive armrest box, comprising a hot riveting machine body, a hydraulic cylinder fixedly mounted on the hot riveting machine body, and an mounting plate for placing the armrest box shell fixedly mounted on the hot riveting machine body. A heat source is fixedly mounted at the lower end of the hydraulic cylinder, and an mounting shell is mounted at the lower end of the heat source. A metal rivet head is fixedly mounted inside the mounting shell, and the metal rivet head is electrically connected to the heat source. A cavity is formed in the inner wall of the mounting shell. A rotating component for controlling the rotation of the mounting shell is mounted on one side of the heat source. The rotating component is used to control the rotation of the metal rivet head and its separation from the rivet post on the armrest box shell. A water inlet pipe and a water outlet pipe communicating with the cavity are fixedly mounted on the outer side of the mounting shell. A circulation component is provided on one side of the hot riveting machine body. The circulation component is fixedly connected to the water inlet pipe and the water outlet pipe for injecting water into the mounting shell for cooling.

[0007] Preferably, the metal rivet head has multiple grooves on its outer side, and multiple extended housings communicating with the cavity are fixedly installed inside the mounting housing. The multiple extended housings are respectively located in the multiple grooves, and the lower end of the metal rivet head has a pressure groove.

[0008] Preferably, the rotating component includes a ring fixedly installed on the upper end of the mounting housing, the ring being rotatably connected to the lower end of the heat source, a toothed ring being fixedly sleeved on the outer side of the ring, a gear being meshed on one side of the toothed ring, a motor being provided on one side of the heat source, the output end of the motor being fixedly connected to the gear, and a circular hole being provided on the upper end of the mounting housing.

[0009] Preferably, a fixed housing is fixedly installed on one side of the heat source, and the motor, gear ring and gear are all installed inside the fixed housing.

[0010] Preferably, the circulation assembly includes a circulating water pump and a cooling tank disposed on one side of the hot riveting machine body. The outlet end of the circulating water pump is fixedly connected to a connecting pipe, and the cooling tank is fixedly connected to a water supply pipe. One end of both the inlet pipe and the outlet pipe is fixedly connected to a telescopic pipe. The two telescopic pipes are respectively fixedly connected to the connecting pipe and the water supply pipe at corresponding positions. The ends of the connecting pipe and the water supply pipe located on the telescopic pipe are both installed on one side of the hot riveting machine body by fasteners. The inlet end of the circulating water pump is fixedly connected to a fixed pipe, and a conduit is fixedly connected between the fixed pipe and the cooling tank.

[0011] Preferably, both the inlet pipe and the outlet pipe are rigid pipes.

[0012] Preferably, the circulation assembly further includes an insulation shell fixedly installed on one side of the cooling tank, a guide pipe fixedly connected between the insulation shell and the water supply pipe, a connecting pipe fixedly connected between the insulation shell and the fixed pipe, and a solenoid valve fixedly installed on both the connecting pipe and the guide pipe.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. To achieve rapid cooling and solidification of the plastic molten material on the working end face of the plastic rivet head and in the molding groove after hot riveting, this invention creates a cavity in the inner wall of the mounting housing, and fixes an inlet pipe and an outlet pipe connected to the cavity on the outside of the mounting housing. After hot pressing, a circulating water pump is started to transport low-temperature cooling water from the cooling tank to the cavity of the mounting housing via connecting pipes, telescopic pipes, and the inlet pipe. As the cooling water flows around the cavity, it undergoes efficient heat exchange with the metal rivet head body through the metal wall of the mounting housing, thus cooling the internal components of the metal rivet head. The heat is quickly carried away, and the heated cooling water flows back to the cooling box through the outlet pipe, telescopic pipe and water supply pipe for cooling. Through the above-mentioned built-in water cooling circulation structure, the metal rivet head can obtain continuous cooling after completing the hot pressing action. The cooling water directly exchanges heat through the mounting shell wrapped around the outside of the metal rivet head. Compared with the traditional side blowing method, the heat exchange area between the cooling medium and the rivet head is significantly increased and the heat transfer efficiency is greatly improved, thereby eliminating defects such as wire drawing and pitting caused by melt adhesion, and significantly improving the riveting forming quality and surface finish.

[0014] 2. To ensure reliable separation of the plastic rivet head from the metal rivet head molding groove during the cooling and curing stage and eliminate the risk of adhesion, this invention includes a ring fixedly mounted on the upper end of the mounting housing and rotatably connected to a heat source. A toothed ring is provided on the outer side of the ring. A gear fixed at the motor output end meshes with the toothed ring for transmission. When hot pressing is completed and the cooling and curing stage begins, the motor is started and controlled to periodically switch between forward and reverse rotation at a predetermined frequency and amplitude. Through the meshing transmission of the gear and the toothed ring, the mounting housing and the metal rivet head fixed at the lower end of the mounting housing are driven to synchronously perform repeated forward and reverse reciprocating rotational movements. During this reciprocating rotation, the inner wall of the molding groove of the rivet head and the gradually curing plastic... The continuous shearing action between the rivet heads effectively breaks the adhesion interface between the melt and the metal wall before the plastic is fully cured, causing the plastic rivet head to separate from the inner wall of the molding groove before it is fully cured. When the metal rivet head rises to demold after cooling and curing, the plastic rivet head can be smoothly removed because it has already formed a separation interface with the inner wall of the molding groove before curing. This not only creates a synergistic cooling effect with the water cooling circulation structure to ensure that the plastic melt is quickly cooled to the target temperature, but also actively cuts off the adhesion path through action intervention, further ensuring the cleanliness of the plastic rivet head surface, effectively eliminating molding defects caused by stringing and material sticking, and eliminating the need for rivet head cleaning and maintenance.

[0015] 3. This invention features an insulated shell on one side of the cooling water tank. A connecting pipe is fixed between the insulated shell and the water supply pipe, and a connecting pipe is fixed between the insulated shell and the fixed pipe. Electromagnetic valves are fixedly installed on the connecting pipe and the guide pipe to control the switching of each flow path. During the cooling and solidification stage, a portion of the high-temperature cooling water drawn from the cavity of the installation shell by the circulating water pump flows back to the cooling tank via the water supply pipe for cooling, while the other portion is diverted through the connecting pipe into the insulated shell for temporary storage and insulation. The heat exchanged from the riveting head during the hot pressing stage is stored as sensible heat in the hot water within the insulated shell. When the current riveting cycle is completed... The hydraulic cylinder controls the metal rivet head to move up and reset. When it is necessary to hot press the next batch of rivets, the corresponding solenoid valve is controlled to switch the flow path. The hot water temporarily stored in the insulation shell is pumped to the cavity of the installation shell through the connecting pipe. The hot water in the preheating stage is used to preheat the metal rivet head in advance, so that the metal rivet head has a certain initial temperature before the electric heating tube is started. Through the above heat recovery and preheating utilization mechanism, the heat that was originally directly dissipated to the environment or completely taken away by the cooling box is recovered and reused for the preheating of the metal rivet head in the next cycle, which effectively shortens the heating time of the electric heating tube to heat the metal rivet head from room temperature to the working temperature. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall right-side three-dimensional structure of the present invention; Figure 2 This is a schematic diagram of the overall left-side three-dimensional structure of the present invention; Figure 3 for Figure 2 A magnified structural diagram of A in the middle; Figure 4 for Figure 2 A magnified structural diagram of B in the diagram; Figure 5 This is a three-dimensional structural diagram of the rotating component of the present invention; Figure 6 This is a frontal perspective three-dimensional cross-sectional view of the mounting housing of the present invention; Figure 7 This is a bottom-view perspective cross-sectional view of the housing of the present invention.

[0017] In the diagram: 1. Hot riveting machine body; 2. Hydraulic cylinder; 3. Mounting plate; 4. Heat source; 5. Mounting housing; 6. Water outlet pipe; 7. Water supply pipe; 8. Fixed housing; 9. Circulating water pump; 10. Guide pipe; 11. Cooling box; 12. Insulation housing; 13. Telescopic pipe; 14. Groove; 15. Metal riveting head; 16. Cavity; 17. Extension housing; 18. Motor; 19. Gear; 20. Gear ring; 21. Round hole; 22. Connecting pipe; 23. Solenoid valve; 24. Ring; 25. Connecting pipe; 26. Water inlet pipe; 27. Fixing component; 28. Guide pipe; 29. ​​Fixed pipe; 30. Pressing groove. Detailed Implementation

[0018] The embodiments of this disclosure will be further described in detail below with reference to the accompanying drawings and examples. The detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of this disclosure by way of example, but should not be used to limit the scope of this disclosure. This disclosure can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0019] Please see Figures 1-7A riveting device for an automotive armrest box includes a hot riveting machine body 1, a hydraulic cylinder 2 fixedly mounted on the hot riveting machine body 1, and a mounting plate 3 for placing the armrest box shell (the mounting plate 3 can be fitted with corresponding clamps according to the armrest box shell to cooperate in fixing the armrest box shell). A heat source 4 is fixedly mounted at the lower end of the hydraulic cylinder 2, and a mounting housing 5 is mounted at the lower end of the heat source 4. A metal rivet head 15 is fixedly mounted inside the mounting housing 5. A pressure groove 30 is opened at the lower end of the metal rivet head 15, and the metal rivet head 15 is electrically connected to the heat source 4 (a circular hole 21 is opened at the upper end of the mounting housing 5 for the connection wire between the metal rivet head 15 and the heat source 4 to pass through, and the circular hole 21 is located at the central axis of the mounting housing 5 and the metal rivet head 15). The mounting housing 5 is designed so that the metal rivet head 15 can rotate without interference. The heat source 4 is a prior art heating module (including an electric heating control circuit and an electrical connection structure with the metal rivet head 15). A cavity 16 is opened in the inner wall of the mounting housing 5. A rotating component is installed on one side of the heat source 4 to control the rotation of the mounting housing 5. The rotating component is used to control the rotation of the metal rivet head 15 and separate it from the rivet post on the armrest box housing. A water inlet pipe 26 and a water outlet pipe 6 connected to the cavity 16 are fixedly installed on the outside of the mounting housing 5. A circulation component is set on one side of the hot riveting machine body 1. The circulation component is fixedly connected to the water inlet pipe 26 and the water outlet pipe 6 and is used to inject water into the mounting housing 5 for cooling. The circulation component includes a circulating water pump 9 and a cooling box 11 set on one side of the hot riveting machine body 1. A connecting pipe 25 is fixedly connected to the water outlet, and a water supply pipe 7 is fixedly connected to the cooling tank 11. One end of both the inlet pipe 26 and the outlet pipe 6 is fixedly connected to a telescopic pipe 13. The two telescopic pipes 13 are respectively fixedly connected to the corresponding connecting pipe 25 and water supply pipe 7. The ends of the connecting pipe 25 and water supply pipe 7 located on the telescopic pipe 13 are both installed on one side of the hot riveting machine body 1 via fasteners 27 (the fasteners 27 can be any connecting component that can fix the pipes to one side of the hot riveting machine body 1, such as an elastic clip; both the inlet pipe 26 and the outlet pipe 6 are rigid pipes to prevent entanglement during the lifting and lowering of the metal riveting head 15; the telescopic pipe 13 facilitates the lifting and lowering of the metal riveting head 15 and subsequent rotation). Circulating water... A fixed pipe 29 is fixedly connected to the inlet end of pump 9. A conduit 28 is fixedly connected between the fixed pipe 29 and the cooling tank 11. After the hydraulic cylinder 2 operates and controls the metal rivet head 15 to complete the hot pressing operation, the circulating water pump 9 is started. The circulating water pump 9 transports the low-temperature cooling water in the cooling tank 11 through the connecting pipe 25, the telescopic pipe 13 connected to the connecting pipe 25, and the inlet pipe 26 to the cavity 16 of the mounting housing 5. During the flow of the cooling water in the cavity 16, heat exchange occurs, carrying away the heat in the metal rivet head 15. The heated cooling water then flows back to the cooling tank 11 through the outlet pipe 6, the telescopic pipe 13 connected to the outlet pipe 6, and the water supply pipe 7 for cooling (the cooling tank 11 is existing technology and can cool the input hot water; it can be an industrial cold water tank).The cooling tank 11 (not limited to this type of cold water tank) allows the metal rivet head 15 to receive continuous cooling after the hot pressing process. Compared with the traditional side-blowing method, the heat exchange area between the cooling medium and the rivet head is significantly increased, and the heat transfer efficiency is greatly improved, thereby eliminating defects such as wire drawing and pitting caused by melt adhesion. The rotating component includes a ring 24 fixedly mounted on the upper end of the mounting housing 5. The ring 24 is rotatably connected to the lower end of the heat source 4. A gear ring 20 is fixedly sleeved on the outer side of the ring 24. A gear 19 is meshed on one side of the gear ring 20. A motor 18 is mounted on one side of the heat source 4. The output end of the motor 18 is fixedly connected to the gear 19. (A fixed housing 8 is fixedly mounted on one side of the heat source 4. The motor 18, gear ring 20, and gear 19 are all installed inside the fixed housing 8. The motor 18 is fixedly mounted on the inner wall of the fixed housing 8. The fixed housing 8 is used to control the motor 18, gear ring 20, and gear 19.) (Protected by gears 19 and 0), when the hot pressing is completed and the cooling and curing stage begins, the motor 18 is started to control it to perform periodic forward and reverse switching at a predetermined frequency and amplitude (rotation arc less than ninety degrees). The motor 18 drives the gear 19 to rotate, the gear 19 drives the gear ring 20 to rotate, the gear ring 20 drives the ring 24 to rotate, and the gear ring 20 drives the mounting housing 5 to rotate. The mounting housing 5, on the one hand, drives the metal rivet head 15 to rotate, and the metal rivet head 15 synchronously performs repeated forward and reverse reciprocating motions, so that the forming groove 30 of the metal rivet head 15 is within A continuous shearing force is generated between the wall and the gradually solidifying plastic rivet head. This shearing force can effectively destroy the adhesion interface between the melt and the metal wall before the plastic is fully solidified, so that the plastic rivet head separates from the inner wall of the molding groove 30 before it is fully solidified. When the metal rivet head 15 is demolded by the hydraulic cylinder 2 after cooling and solidification, the plastic rivet head can be smoothly removed because it has formed a separation interface with the inner wall of the molding groove 30 before solidification. This achieves reliable separation of the plastic rivet head from the metal rivet head 15 molding groove 30 during the cooling and solidification stage, eliminating the risk of adhesion. When the mounting housing 5 rotates, it can also drive the cooling water inside to shake, so that the cooling water entering the mounting housing 5 can fully contact the inner wall of the cavity 16 of the mounting housing 5, improving the heat exchange effect. This not only forms a synergistic cooling effect with the above-mentioned water cooling circulation structure to ensure that the plastic melt is quickly cooled to the target temperature, but also actively cuts off the adhesion path through action intervention, further ensuring the cleanliness of the plastic rivet head surface, effectively eliminating molding defects caused by stringing and sticking, and eliminating the need for rivet head cleaning and maintenance.

[0020] As a further technical solution of the present invention, a plurality of grooves 14 are provided on the outer side of the metal rivet head 15, and a plurality of extended shells 17 communicating with the cavity 16 are fixedly installed inside the mounting shell 5. The plurality of extended shells 17 are respectively located in the plurality of grooves 14, extending the extended shells 17 into the grooves 14 inside the metal rivet head 15, increasing the heat exchange area and further improving the heat exchange effect.

[0021] As a further technical solution of the present invention, the circulation component also includes a heat insulation shell 12 fixedly installed on one side of the cooling box 11 (the heat insulation shell 12 not only has a heat insulation effect, but also heat insulation). A guide pipe 10 is fixedly connected between the heat insulation shell 12 and the water supply pipe 7, and a connecting pipe 22 is fixedly connected between the heat insulation shell 12 and the fixed pipe 29. Solenoid valves 23 are fixedly installed on the connecting pipe 22 and the guide pipe 28 to control the switching of each flow path. During the cooling and solidification stage, the high temperature cooling water pumped by the circulating water pump 9 from the cavity 16 of the installation shell 5 is partially returned to the cooling box 11 through the water supply pipe 7 for cooling, and the other part is diverted into the heat insulation shell 12 through the guide pipe 10 for temporary storage and heat preservation. The heat exchanged from the metal rivet head 15 during the hot pressing stage is stored in the hot water in the heat insulation shell 12 in the form of sensible heat. After one riveting operation is completed, the metal rivet head 15 is moved upward and reset by the hydraulic cylinder 2. At this time, the corresponding solenoid valve 23 is controlled to switch the flow path. The hot water temporarily stored in the insulation shell 12 is pumped to the cavity 16 of the installation shell 5 through the connecting pipe 22. The hot water in the preheating stage is used to preheat the metal rivet head 15 in advance for hot pressing of the next batch of rivets. This allows the metal rivet head 15 to obtain a certain initial temperature before the electric heating tube is started (the electric heating tube is installed in the metal rivet head 15, which is the existing technology, and is used for electric heating of the metal rivet head 15. After the electric heating tube is working, the pressure relief work required by each pipe is completed according to the existing technology process). Through the above heat recovery and waste heat utilization mechanism, the heat that was originally directly dissipated to the environment or completely taken away by the cooling box 11 is recovered and reused for the preheating of the metal rivet head 15 in the next cycle, which effectively shortens the heating time of the electric heating tube to heat the metal rivet head 15 from room temperature to the working temperature.

[0022] During work: I. Preparation Stage According to the specific model and dimensions of the handrail box to be riveted, install the corresponding special fixture on the mounting plate 3, control the hydraulic cylinder 2 to retract to the initial position, so that the metal rivet head 15 is at the highest point, set the heating temperature of the metal rivet head 15 through the heat source 4, and set the reciprocating rotation frequency and amplitude of the motor 18 (rotation arc less than ninety degrees). II. Hot Pressing Stage When the heat source 4 is powered on, the metal rivet head 15 is electrically heated (the electric heating tube inside the metal rivet head 15 is working), so that its working end face and the inner wall of the pressure groove 30 are heated to the preset riveting temperature. During this preheating stage, if the hot water from the previous cycle has been stored in the insulation shell 12, the corresponding solenoid valve 23 is controlled to switch the flow path, and the hot water in the insulation shell 12 is pumped to the cavity 16 of the installation shell 5 through the connecting pipe 22. The hot water is used to preheat the metal rivet head 15 in advance, shortening the electric heating time. When the metal rivet head 15 reaches the set temperature, the hydraulic cylinder 2 is activated, and its working end extends to push the heat source 4, the mounting housing 5, and the metal rivet head 15 vertically downward. The pressure groove 30 at the lower end of the metal rivet head 15 first contacts the top of the plastic rivet on the armrest box. Under the combined action of the continuous pressure of the hydraulic cylinder 2 and the high temperature of the metal rivet head 15, the plastic rivet gradually softens, melts, and flows into the molding space of the entire pressure groove 30. Finally, it is hot-pressed into a plastic rivet head that is consistent with the shape of the pressure groove 30. The hydraulic cylinder 2 maintains the pressure briefly to allow the plastic to flow and fill fully. III. Water Cooling Stage After the hot pressing and pressure holding are completed, the circulating water pump 9 is immediately started. The circulating water pump 9 transports the low-temperature cooling water in the cooling tank 11 through the connecting pipe 25, the telescopic pipe 13 connected to the connecting pipe 25 and the water inlet pipe 26 to the annular cavity 16 of the mounting shell 5. The cooling water flows around in the cavity 16 and at the same time penetrates into the groove 14 opened on the outside of the metal rivet head 15 through multiple extended shells 17, so that the cooling water directly wraps the outer periphery and the inner extended area of ​​the metal rivet head 15, and performs efficient heat exchange with the metal rivet head 15, quickly removing the residual heat in the pressure groove 30 area. Part of the heated cooling water flows back to the cooling tank 11 through the water outlet pipe 6, the telescopic pipe 13 connected to the water outlet pipe 6 and the water supply pipe 7 for cooling, and the other part is diverted to the guide pipe 10 at the water supply pipe 7 and then transported to the heat preservation shell 12. After the water-cooling circulation has been running for a period of time, the motor 18 is started and performs periodic forward and reverse rotations at a preset frequency and amplitude. The motor 18 drives the gear 19 to rotate, and the gear 19 drives the ring 24 and the mounting housing 5 to rotate back and forth through the meshing gear ring 20. The mounting housing 5 simultaneously drives the metal rivet head 15 and its pressure groove 30 to rotate back and forth repeatedly. During the reciprocating rotation, a continuous shearing action is generated between the inner wall of the pressure groove 30 and the gradually solidified plastic rivet head. This shearing force effectively destroys the adhesion interface between the melt and the metal wall during the window period when the plastic has not been completely solidified and is still in a highly elastic state, so that the plastic rivet head and the inner wall of the pressure groove 30 separate before they are completely solidified. At the same time, during the reciprocating rotation of the mounting housing 5, the cooling water inside it is agitated and shaken, which makes the cooling water more fully contact the inner wall of the cavity 16, further improving the heat exchange uniformity and cooling efficiency. IV. Reset and Heat Recovery Stage of Metal Rivet Head 15 After the plastic rivet head has been fully cooled and cured and the adhesion interface has been sheared and destroyed, the hydraulic cylinder 2 is controlled to retract, driving the metal rivet head 15 to rise vertically and reset. Since the plastic rivet head has separated from the inner wall of the pressure groove 30 before curing, the rivet head can be demolded smoothly when it rises, without producing stringing or sticking. During the cooling water circulation process, a portion of the hot water is diverted into the insulation shell 12 through the guide pipe 10, and the heat exchanged from the metal rivet 15 during the hot pressing stage is stored in the hot water in the insulation shell 12 in the form of sensible heat. After a riveting operation is completed, the corresponding solenoid valve 23 is controlled to switch the flow path. The hot water temporarily stored in the insulation shell 12 is pumped to the cavity 16 of the installation shell 5 through the connecting pipe 22. The hot water in the preheating stage is used to preheat the metal rivet head 15 in advance, so that the metal rivet head 15 obtains a certain initial temperature before the electric heating tube is started, thereby shortening the heating time of the next cycle.

[0023] The technical principles of the present invention have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of the invention and should not be construed as limiting the scope of protection of the invention in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of the invention without inventive effort, and these embodiments will all fall within the scope of protection of the claims of the present invention.

Claims

1. A riveting device for an automotive armrest box, comprising a hot riveting machine body (1), characterized in that, A hydraulic cylinder (2) is fixedly installed on the hot riveting machine body (1). A mounting plate (3) for placing the armrest box shell is also fixedly installed on the hot riveting machine body (1). A heat source (4) is fixedly installed at the lower end of the hydraulic cylinder (2). A mounting shell (5) is installed at the lower end of the heat source (4). A metal rivet head (15) is fixedly installed inside the mounting shell (5). The metal rivet head (15) is electrically connected to the heat source (4). A cavity (1) is opened in the inner wall of the mounting shell (5). 6) A rotating component is installed on one side of the heat source (4) to control the rotation of the mounting housing (5). The rotating component is used to control the rotation of the metal rivet head (15) and the rivet column on the armrest box housing. A water inlet pipe (26) and a water outlet pipe (6) connected to the cavity (16) are fixedly installed on the outside of the mounting housing (5). A circulation component is provided on one side of the hot riveting machine body (1). The circulation component is fixedly connected to the water inlet pipe (26) and the water outlet pipe (6) and is used to inject water into the mounting housing (5) for cooling.

2. The riveting device for an automotive armrest box according to claim 1, characterized in that, The metal rivet head (15) has multiple grooves (14) on its outer side. The mounting housing (5) has multiple extension housings (17) that communicate with the cavity (16) fixedly installed inside. The multiple extension housings (17) are located in the multiple grooves (14) respectively. The metal rivet head (15) has a pressure groove (30) at its lower end.

3. The riveting device for an automotive armrest box according to claim 2, characterized in that, The rotating component includes a ring (24) fixedly installed on the upper end of the mounting housing (5). The ring (24) is rotatably connected to the lower end of the heat source (4). A toothed ring (20) is fixedly sleeved on the outer side of the ring (24). A gear (19) is meshed on one side of the toothed ring (20). A motor (18) is provided on one side of the heat source (4). The output end of the motor (18) is fixedly connected to the gear (19). A circular hole (21) is opened at the upper end of the mounting housing (5).

4. The riveting device for an automotive armrest box according to claim 3, characterized in that, A fixed housing (8) is fixedly installed on one side of the heat source (4), and the motor (18), gear ring (20) and gear (19) are all installed inside the fixed housing (8).

5. The riveting device for an automotive armrest box according to claim 4, characterized in that, The circulation assembly includes a circulating water pump (9) and a cooling tank (11) located on one side of the hot riveting machine body (1). The outlet end of the circulating water pump (9) is fixedly connected to a connecting pipe (25). The cooling tank (11) is fixedly connected to a water supply pipe (7). One end of the inlet pipe (26) and the outlet pipe (6) are both fixedly connected to a telescopic pipe (13). The two telescopic pipes (13) are fixedly connected to the corresponding connecting pipe (25) and the water supply pipe (7). The ends of the connecting pipe (25) and the water supply pipe (7) located on the telescopic pipe (13) are both installed on one side of the hot riveting machine body (1) by a fastener (27). The inlet end of the circulating water pump (9) is fixedly connected to a fixed pipe (29). The fixed pipe (29) and the cooling tank (11) are fixedly connected by a conduit (28).

6. The riveting device for an automotive armrest box according to claim 5, characterized in that, Both the inlet pipe (26) and the outlet pipe (6) are rigid pipes.

7. A riveting device for an automotive armrest box according to claim 6, characterized in that, The circulation assembly also includes an insulation shell (12) fixedly installed on one side of the cooling box (11). A guide pipe (10) is fixedly connected between the insulation shell (12) and the water supply pipe (7). A connecting pipe (22) is fixedly connected between the insulation shell (12) and the fixed pipe (29). A solenoid valve (23) is fixedly installed on both the connecting pipe (22) and the guide pipe (28).

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