Plastic multi-point hot riveting equipment with detachable hot riveting head

Abstract

The application relates to the technical field of hot riveting machines, and discloses a plastic multi-point hot riveting device with detachable hot riveting heads, which comprises a heat-conducting pressure head, two groups of heating coils are respectively arranged on the two sides of the heat-conducting pressure head, three groups of thermocouples are arranged on the front side of the heat-conducting pressure head, a heat spreading plate is arranged in the heat-conducting pressure head, a plurality of connecting pieces are arranged below the heat spreading plate, a hot riveting head is arranged in each connecting piece, and the upper end of each hot riveting head is in abutment with the heat spreading plate. The application guarantees the consistency of hot riveting machining precision: the heat spreading plate provides a unified installation reference for the hot riveting heads, the locking structure ensures the stability of the reference precision; the trigger ring and the locking ring realize synchronous action through the cooperation of a limiting groove-limiting block, the trigger rod accurately slides along a preset sliding groove track, the accurate transmission of the unlocking and locking actions is guaranteed, the installation height and stress balance of the hot riveting heads are ensured, and the consistency of hot riveting finished products is improved.

Description

Technical Field

[0001] This invention relates to the technical field of hot riveting machines, and more particularly to a plastic multi-point hot riveting device with a detachable hot riveting head. Background Technology

[0002] Multi-point hot riveting equipment for plastics is a specialized device used to join thermoplastic parts. It simultaneously heats and pressurizes plastic pillars using multiple heated riveting heads, shaping them into rivet heads to achieve a secure multi-point riveting connection. This technology is efficient and reliable, and is widely used in the automotive, home appliance, and electronics industries for rapid assembly of plastic components.

[0003] A multi-point hot riveting welding machine is disclosed in patent publication number CN109396680A, comprising: a hot riveting fixture including a plurality of hot riveting welding heads; a first drive mechanism for driving the hot riveting fixture to move up and down between a first position and a second position; and a gravity compensation mechanism connected to the hot riveting fixture, the gravity compensation mechanism at least partially compensating for the gravity of the hot riveting fixture.

[0004] The existing technology has the following drawbacks: Existing plastic multi-point hot riveting equipment relies heavily on axial pushing or auxiliary tools for the assembly and disassembly of hot riveting heads. This process is cumbersome and time-consuming, making it difficult to adapt to the needs of high-frequency changeover processing. The locking structure is simple and lacks effective axial and circumferential dual limiting. Under the vibration and temperature change environment of hot riveting operations, problems such as component movement and loosening are prone to occur, resulting in insufficient operational reliability. At the same time, the installation benchmark of the hot riveting head lacks a stable locking mechanism, and the transmission accuracy of component linkage is low. This leads to uneven installation height and force of each hot riveting head, poor consistency of hot riveting processing accuracy, and inability to guarantee stable finished product quality, making it difficult to meet the needs of high-precision hot riveting processing. Summary of the Invention

[0005] In view of the above-mentioned problems in the existing technology, a plastic multi-point hot riveting device with a detachable hot riveting head is proposed.

[0006] One aspect of this application provides a plastic multi-point hot riveting device with a detachable hot riveting head, the purpose of which is to facilitate the disassembly and installation of the hot riveting head and improve the temperature uniformity of the hot riveting head.

[0007] The technical solution of the present invention is as follows: a plastic multi-point hot riveting device with a detachable hot riveting head, including a heat-conducting pressure head, two sets of heating coils respectively passing through both sides of the heat-conducting pressure head, three sets of thermocouples arranged on the front side of the heat-conducting pressure head, a heat-spreading plate arranged inside the heat-conducting pressure head, and multiple connecting parts arranged below the heat-spreading plate, each connecting part being provided with a hot riveting head, and the upper end of each hot riveting head abutting against the heat-spreading plate; The connector includes a threaded section. The lower end of the threaded section is provided with an outer ring and an inner ring located inside the outer ring. A sliding cavity is formed between the outer ring and the inner ring. A sliding ring is slidably disposed in the sliding cavity. A limit ring is provided inside the sliding ring. A spring abuts against the limit ring and the threaded section. Multiple engaging holes are provided through the inner ring. Each engaging hole contains a ball. A locking ring is provided below the threaded section. The upper end of the locking ring can be inserted into the inner ring. The upper end of the locking ring is provided with an engaging groove that matches the engaging holes. When in the locked position, the limit ring is outside the ball and the ball is engaged in the engaging groove.

[0008] Furthermore, the hot riveting head is provided with a shaft step that matches the locking ring.

[0009] Furthermore, a trigger ring is slidably sleeved on the locking ring, a limiting groove is provided on the locking ring along the axial direction, a limiting block is provided on the inner side of the trigger ring, the limiting block slides in the limiting groove, a trigger rod is provided on the trigger ring, the side wall of the trigger rod abuts against the lower end of the sliding ring, an annular groove is provided on the locking ring, a second spring is provided in the annular groove, the second spring abuts against the trigger ring, a sliding groove is provided on the inner wall of the outer ring, both ends of the sliding groove extend to the lower end face of the outer ring, the sliding groove includes a connected arc segment and a vertical segment, and the end of the trigger rod slides in the sliding groove.

[0010] Furthermore, a blocking plate is provided at the opening of the vertical section, and the blocking plate has a one-way opening.

[0011] Furthermore, the diameter of the upper section of the hot riveting head is larger than the diameter of the lower section of the shaft step.

[0012] Furthermore, the heat spreader is provided with a locking cavity at its end, and symmetrical ball bearings are provided in the locking cavity. The two ball bearings abut against ball bearing 3. The heat spreader is provided with a locking bolt at its end, and the threaded end of the locking bolt is connected to ball bearing 3. Ball bearings 2 and ball bearing 3 are magnetically attracted to each other. When the locking bolt is tightened, the two ball bearings 2 protrude out of the heat spreader.

[0013] Furthermore, a lower pressure plate is connected above the heat-conducting pressure head, and a receiving plate is provided below the heat-conducting pressure head. A guide post is fixedly connected to the lower pressure plate, and the guide post is slidably connected to the receiving plate. A spring is sleeved on the guide post, and the spring abuts against the lower pressure plate and the receiving plate.

[0014] Furthermore, the lower end face of the limiting ring is an inclined surface.

[0015] Furthermore, a recess is provided on the lower end face of the outer ring.

[0016] The beneficial effects of this invention are: Simplify the disassembly and assembly of hot riveting heads and improve changeover efficiency: The axial pushing action required for unlocking is converted into a circumferential rotation action through the trigger ring and trigger rod assembly. No auxiliary tools are needed. The disassembly and assembly of hot riveting heads can be completed with a simple and continuous action of "rotate to unlock - toggle to disassemble" and "rotate to push - lock". At the same time, the heat spreader adopts a bolt-driven ball locking structure to achieve quick locking and unlocking, which greatly shortens the changeover time and adapts to the needs of high-frequency changeover processing.

[0017] Enhanced locking stability and reliable operation: In the locked state, a dual locking structure of "axial + circumferential" is formed. The trigger rod engages with the recess to achieve circumferential limitation, and the one-way opening of the blocking plate restricts the return movement of the trigger rod to achieve axial limitation. The arc transition fit between the first ball and the engagement groove and the pre-tightening limitation of the first spring prevent the first ball from coming out. The ball engagement and positioning structure of the heat spreader plate prevents the heat spreader plate from shifting due to vibration or temperature changes. Multiple protections ensure that the parts do not move or loosen during hot riveting operations.

[0018] Ensuring consistent precision in hot riveting: The heat spreader provides a uniform installation reference for the hot riveting heads, and its locking structure ensures stable reference accuracy; the trigger ring and locking ring achieve synchronous action through the cooperation of the limiting groove and the limiting block, and the trigger rod slides precisely along the preset sliding groove trajectory to ensure the accurate transmission of unlocking and locking actions, so that the installation height and force of each hot riveting head are balanced, and the consistency of the hot riveting finished product is improved. Attached Figure Description

[0019] Figure 1 This is a perspective view of the plastic multi-point hot riveting device with a detachable hot riveting head according to the present invention; Figure 2 This is a left view of the plastic multi-point hot riveting device with a detachable hot riveting head according to the present invention; Figure 3 For the present invention Figure 2 Sectional view at point AA; Figure 4 For the present invention Figure 3 Enlarged view of the structure at point B in the middle; Figure 5 This is a perspective view of the connector in the plastic multi-point hot riveting device with a detachable hot riveting head of the present invention; Figure 6 This is a top view of the connector in the plastic multi-point hot riveting device with a detachable hot riveting head of the present invention; Figure 7 For the present invention Figure 6 Sectional view at CC; Figure 8 This is an exploded view of the connector in the plastic multi-point hot riveting device with a detachable hot riveting head of the present invention; Figure 9 This is a perspective view of the threaded section of the connector in the plastic multi-point hot riveting device with a detachable hot riveting head of the present invention. Figure 10 This is a perspective view of the trigger ring in the plastic multi-point hot riveting device with a detachable hot riveting head of the present invention; Figure 11 This is a perspective view of the baffle plate in the plastic multi-point hot riveting device with a detachable hot riveting head of the present invention.

[0020] In the picture: 1. Heat-conducting pressure head; 2. Heating coil; 3. Thermocouple; 4. Heat-spreading plate; 5. Connector; 6. Hot riveting head; 7. Threaded section; 8. Outer ring; 9. Inner ring; 10. Sliding cavity; 11. Sliding ring; 12. Limiting ring; 13. Spring 1; 14. Engaging hole; 15. Ball 1; 16. Locking ring; 17. Engaging groove; 18. Shaft step; 19. Trigger ring; 20. Limiting groove; 21. Limiting block; 22. Trigger rod; 23. Annular groove; 24. Spring 2; 25. Arc-shaped section; 26. Vertical section; 27. Blocking plate; 28. One-way opening; 29. ​​Locking cavity; 30. Ball 2; 31. Ball 3; 32. Locking bolt; 33. Lower pressure plate; 34. Receiving plate; 35. Guide post; 36. Spring 3; 37. Recess. Detailed Implementation

[0021] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0022] Example, refer to Figures 1-11 As an embodiment of the present invention, a plastic multi-point hot riveting device with a detachable hot riveting head 6 is provided, referring to... Figures 1-5 The device includes a heat-conducting pressure head 1, a lower pressure plate 33 fixedly connected above the heat-conducting pressure head 1, and a receiving plate 34 correspondingly provided below the heat-conducting pressure head 1. The receiving plate 34 serves as a dedicated support structure for the workpiece to be pressed, allowing the workpiece to be stably and precisely positioned on the bearing surface of the receiving plate 34. A guide post 35 is fixedly connected to the end face of the lower pressure plate 33, with the lower end of the guide post 35 extending into the interior of the receiving plate 34 and forming a sliding connection with the receiving plate 34. A spring 36 is coaxially sleeved on the guide post 35, with the upper and lower ends of the spring 36 abutting against the lower end face of the lower pressure plate 33 and the upper end face of the receiving plate 34, respectively. With the elastic support and buffering effect of the spring 36, the heat-conducting pressure head 1 can form a stable pressing force on the workpiece to be pressed, while avoiding pressure damage to the workpiece caused by hard pressing. At the same time, it can accommodate slight dimensional deviations of the workpiece, ensuring the fit of the pressing.

[0023] Two independently arranged heating coils 2 are respectively installed on both sides of the heat-conducting pressure head 1. Both sets of heating coils 2 are equipped with PID modules. Three sets of thermocouples 3 are arranged linearly on the front end face of the heat-conducting pressure head 1. The three sets of thermocouples 3 are arranged in a coaxial position. The thermocouples 3 on both sides form a one-to-one temperature measurement matching relationship with the heating coils 2 on both sides, serving as the temperature detection end of the corresponding heating area. The thermocouple 3 in the middle serves as the reference temperature measurement end, undertaking the role of temperature parameter comparison and calibration. After the operator completes the temperature parameter setting in the equipment's control system, the intermediate thermocouple 3 will accurately compare the temperature of the reference area of ​​the heat-conducting pressure head 1 detected in real time with the set temperature parameter. At the same time, the thermocouples 3 on both sides will synchronously compare the temperature of their respective heating areas detected with the reference temperature of the intermediate thermocouple 3 in real time. When the actual temperature detected by the intermediate thermocouple 3 is lower than the preset temperature parameter, and the area temperatures detected by the thermocouples 3 on both sides are lower than the reference temperature of the intermediate thermocouple 3, the controller equipped with the PID module will immediately receive the temperature difference signal and issue independent heating commands to the heating coils 2 on both sides respectively, so as to realize the synchronous heating operation of the two sets of heating coils 2. During the heating process, if uneven heating occurs on both sides of the heat-conducting pressure head 1, the control system program will use the analog quantity adjustment unit built into the PID module to locally increase the heating power in the heating area with a lower temperature and locally decrease the heating power in the heating area with a higher temperature. Through this zoned and precise power control method, the overall temperature field of the heat-conducting pressure head 1 can be dynamically and uniformly adjusted. This ensures that the working temperature of the seven hot riveting heads 6 arranged at the lower end of the heat-conducting pressure head 1 remains highly similar. This avoids the temperature deviation problem of individual hot riveting heads 6 from the core principle of temperature control, and ultimately effectively ensures the hot riveting processing quality of the product. At the same time, it significantly improves the consistency of the finished workpiece in terms of size, fusion effect and other dimensions after hot riveting, and effectively reduces the product defect rate.

[0024] A heat-spreading plate 4 is fixedly embedded in the internal cavity of the heat-conducting pressure head 1. This heat-spreading plate 4 is made of a high thermal conductivity material, which possesses the physical characteristics of rapid heat conduction and uniform temperature distribution, preventing localized heat accumulation or delayed heat conduction. The heat-spreading plate 4 serves three functions in the equipment: first, it rapidly diffuses and homogenizes the heat transferred by the heat-conducting pressure head 1 through its high thermal conductivity, performing a secondary averaging of the working temperature of the seven heat-spreading heads 6, further reducing the temperature difference between the heat-spreading heads 6 and ensuring a highly uniform temperature across all heat-spreading heads 6; second, it provides a uniform and flat mounting reference surface for the upper ends of the multiple heat-spreading heads 6, allowing all heat-spreading heads 6 to be mounted on a level surface. Assembly is completed on the same datum, ensuring that the initial assembly height of each hot riveting head 6 is consistent, avoiding the problem of inconsistent hot riveting pressing depth caused by assembly height deviation; thirdly, it has convenient disassembly and replacement characteristics. Under the long-term high-frequency hot riveting pressing operation conditions, the reference surface of the heat spreader plate 4 and the hot riveting head 6 will wear and deform due to continuous friction, squeezing and high temperature baking. At this time, there is no need to disassemble and maintain the entire heat-conducting pressure head 1. It is only necessary to remove the worn heat spreader plate 4 from the inside of the heat-conducting pressure head 1 and replace it with a new heat spreader plate 4. The assembly height of multiple hot riveting heads 6 can be quickly recalibrated, the pressing reference accuracy of the hot riveting head 6 can be restored, and the maintenance cost and downtime of the equipment can be greatly reduced.

[0025] Multiple connectors 5 are arranged below the heat spreader 4. Each connector 5 is fixedly engaged with the inner wall of the heat-conducting pressure head 1 by a threaded connection. This threaded connection structure can stably install and fix the heat riveting head 6 in the preset position of the heat-conducting pressure head 1, ensuring the structural stability of the heat riveting head 6 during the pressing operation. It also allows for quick assembly and disassembly of the connectors 5 by screwing, thus enabling convenient disassembly and replacement of the heat riveting head 6. It can flexibly adapt to the processing of workpieces with different specifications and heat riveting point requirements. Each connector 5 has an independent heat riveting head 6 inside. The upper end face of each heat riveting head 6 abuts against the lower end face of the heat spreader 4, which can directly receive the homogenized heat conducted by the heat spreader 4, ensuring the heat supply efficiency and temperature stability of the heat riveting head 6. The hot riveting head 6 has an integrally formed shaft step 18. The shaft step 18 has a stepped structure design. The diameter of the upper section of the shaft step 18 is larger than the diameter of the lower section of the shaft step 18, forming a staggered locking and limiting structure. This structure can make the inner wall of the connector 5 and the stepped surface of the shaft step 18 form a precise locking and fixing, and provide axial limiting for the hot riveting head 6.

[0026] Reference Figures 5-9The core structure of connector 5 is designed in a coaxial nested manner based on threaded segment 7. Specifically, threaded segment 7 serves as the core load-bearing and connecting component, with its lower end fixedly connected to outer ring 8. Inner ring 9 is coaxially arranged inside outer ring 8, forming a closed annular sliding cavity 10 between them. The cavity wall of sliding cavity 10 is precision ground to ensure smooth movement of internal sliding components. A sliding ring 11 is slidably assembled inside sliding cavity 10. The sliding ring 11 and the wall of sliding cavity 10 are clearance-fitted to achieve smooth axial sliding without radial movement. The inner side of sliding ring 11 is fixedly connected to limit ring 12 through interference fit, forming a synchronous linkage structure that enables linkage control of unlocking operation. Multiple engagement holes 14 are evenly distributed around the inner ring 9. Each engagement hole 14 is radially distributed and a ball bearing 15 is fitted inside each hole. The ball bearing 15 can move radially within the hole. A locking ring 16 is provided directly below the threaded section 7. The upper end of the locking ring 16 is designed as a columnar structure that matches the inner diameter of the inner ring 9. It can be inserted into the inner ring 9 to form a coaxial positioning. The upper end of the locking ring 16 has an engagement groove 17 corresponding to the engagement hole 14, which constitutes the engagement and limiting structure of the ball bearing 15.

[0027] The inclined structure on the lower end face of the limiting ring 12 is a quick-locking transmission structure. Its function is to convert the axial insertion force of the locking ring 16 into the radial locking force of the ball 15, guiding the ball 15 into the locking groove 17 to complete the locking. Before the locking ring 16 is inserted upward into the inner ring 9, the sliding ring 11 needs to be pushed upward to move the limiting ring 12 upward simultaneously and disengage it from the outside of the ball 15, releasing the radial restriction on the ball 15. Then, the upper end of the locking ring 16 is aligned with the inner ring 9 and inserted. During the insertion process, the upper edge of the locking ring 16 first contacts the ball 15 and generates axial compression. At this time, the sliding ring 11 is released, and the limiting ring 12 is reset under the preload of the spring 13, keeping the lower inclined surface tightly fitted with the outside of the ball 15. As the locking ring 16 is continuously inserted, the axial thrust of the locking ring 16 is transmitted to the inclined surface through the ball 15. The inclined surface, with the guiding effect of the inclined angle, generates a radially inward squeezing force on the ball 15, pushing the ball 15 to move inward toward the inside of the engagement hole 14. One end of the spring 13 abuts against the lower end face of the threaded section 7, and the other end abuts against the upper end face of the limiting ring 12, and is always in a pre-compressed state. Its functions include two aspects: first, to provide a continuous downward preload to the limiting ring 12, ensuring that the limiting ring 12 always fits against the outside of the ball 15 in the locked state, forming a radial limit on the ball 15, and preventing the ball 15 from dislodging from the engagement groove 17 and causing the locking to fail; second, to drive the limiting ring 12 to automatically reset after unlocking, preparing for the next locking operation.

[0028] Reference Figures 7-10A trigger ring 19 is slidably sleeved on the locking ring 16. The two are coaxially nested and have a sliding fit structure, ensuring that the trigger ring 19 can slide smoothly relative to the locking ring 16. A limiting groove 20 is integrally formed on the locking ring 16 along the axial direction. A limiting block 21 is integrally formed on the inner sidewall of the trigger ring 19 corresponding to the position of the limiting groove 20. The limiting block 21 is adapted to be embedded in the limiting groove 20 and can slide along the extension direction of the limiting groove 20. Through the concave-convex fit structure between the limiting groove 20 and the limiting block 21, the directional sliding constraint of the trigger ring 19 along the axial direction of the locking ring 16 is realized, while the circumferential rotation of the trigger ring 19 relative to the locking ring 16 is restricted, ensuring the circumferential movement synchronization of the trigger ring 19 and the locking ring 16. Trigger rods 22 are evenly distributed around the circumference of the trigger ring 19. The trigger rods 22 and the trigger ring 19 are an integral structure. The upper sidewall of the trigger rod 22 is in surface contact with the lower end face of the sliding ring 11 to ensure that the action of the trigger rod 22 can be accurately transmitted to the sliding ring 11. The outer circumference of the locking ring 16 is provided with an annular groove 23. A spring 24 is embedded in the annular groove 23. One end of the spring 24 abuts against the bottom of the annular groove 23, and the other end abuts against the lower end face of the trigger ring 19. The spring 24 is always in a pre-compressed state to provide a continuous axial elastic force for the trigger ring 19.

[0029] A sliding groove is formed on the inner wall of the outer ring 8 corresponding to the position of the trigger rod 22. The number and spacing of the sliding grooves match the trigger rod 22. Both ends of the sliding groove extend to the lower end face of the outer ring 8, forming a groove structure that is open at both ends. The sliding groove is composed of a connected arc-shaped segment 25 and a vertical segment 26, which constitute the sliding trajectory channel of the trigger rod 22. The end of the trigger rod 22 extends into the sliding groove and can slide smoothly along the groove trajectory. A blocking plate 27 is fixedly installed at the lower opening of the vertical segment 26 by a fastening connection. The blocking plate 27 has a one-way opening 28. The orientation of the one-way opening 28 is consistent with the locking sliding direction of the trigger rod 22, which is used to limit the trigger rod 22 from sliding back along the original path after it slides out. A recess 37 is formed at the position where the lower end face of the outer ring 8 is misaligned with the opening of the sliding groove. The size of the recess 37 is adapted to the end size of the trigger rod 22, which is used for positioning and locking the trigger rod 22 after it is locked. The core principle of the trigger ring 19 and trigger rod 22 assembly is to transform the axial pushing action of the sliding ring 11 required for unlocking the ball bearing 15 into the circumferential rotation action of the locking ring 16, reducing the difficulty of operation and labor intensity, and enabling disassembly and installation to be completed with one hand. The axial elastic force continuously provided by the spring 24 is transmitted to the trigger rod 22 through the trigger ring 19, ensuring that the end of the trigger rod 22 always presses against the corresponding end face of the outer ring 8, guaranteeing the fit between the trigger rod 22 and the sliding groove wall, and ensuring the stability of the sliding process and the accuracy of the action transmission.

[0030] Reference Figures 3-4The heat spreader 4 has an inwardly recessed end forming a locking cavity 29. The locking cavity 29 is a symmetrical cavity structure, adapted to accommodate two symmetrically arranged ball bearings 30. The two ball bearings 30 are arranged opposite each other and abut against ball bearing 31, forming a "two-point abutment" force-bearing structure. A threaded hole is provided at the end of the heat spreader 4 corresponding to the locking cavity 29. A locking bolt 32 is fitted into the threaded hole, and the threaded end of the locking bolt 32 is fixedly connected to ball bearing 31, achieving synchronous linkage between the locking bolt 32 and ball bearing 31. Both ball bearings 30 and 31 are made of a magnetically attractive material, forming a magnetic attraction between them to ensure the stability of the abutment state and prevent relative displacement. The function of this locking structure is to achieve rapid locking and positioning of the heat spreader plate 4 and the heat-conducting pressure head 1. When the locking bolt 32 is tightened, the locking bolt 32 moves axially into the locking cavity 29 along the threaded hole, driving the ball bearing 31 to move synchronously into the cavity. Due to the abutting fit and magnetic attraction between the ball bearing 20 and the ball bearing 31, the ball bearing 31 generates a radial outward pushing force on the two ball bearing 20 when it moves, pushing the two ball bearing 20 to move synchronously outward along the symmetrical direction of the locking cavity 29, and finally causing part of the two ball bearing 20 to protrude through the outer wall of the heat spreader plate 4. The protruding part of the ball bearing 20 can form a locking fit with the positioning groove or positioning hole inside the heat-conducting pressure head 1, so as to achieve precise locking of the heat spreader plate 4 in the heat-conducting pressure head 1, avoid displacement of the heat spreader plate 4 due to vibration or temperature changes during the hot riveting operation, and ensure the installation reference accuracy of the hot riveting head 6.

[0031] Working principle of the invention: First, the locking ring 16 is coaxially sleeved and fixed on the hot riveting head 6, so that the upper end face of the locking ring 16 is tightly fitted with the lower end face of the ball 15. Then, the locking ring 16 is rotated along the extension direction of the arc section 25 of the sliding groove. Since the trigger ring 19 is circumferentially fixed to the limiting groove 20 of the locking ring 16 through the limiting block 21, the locking ring 16 rotates synchronously, driving the trigger rod 22 to rotate. Under the continuous compression of the spring 24, the end of the trigger rod 22 slides along the trajectory of the arc section 25 of the sliding groove. As the trigger rod 22 slides along the arc segment 25, its upper sidewall continuously presses against the lower end face of the sliding ring 11, generating an axial upward thrust that pushes the sliding ring 11 upward along the sliding cavity 10, thereby causing the limiting ring 12 to move upward synchronously. When the trigger rod 22 slides to the intersection of the arc segment 25 and the vertical segment 26, the sliding ring 11 moves to the preset unlocking position, releasing the radial limiting constraint on the ball 15 and completing the unlocking pre-action. Continue pushing the locking ring 16 upwards, causing the engagement groove 17 at the upper end of the locking ring 16 to move towards the engagement hole 14 of the inner ring 9, until the engagement hole 14 and the engagement groove 17 are precisely aligned. During this process, the trigger rod 22 slides upwards along the arc section 25 of the sliding groove. When the trigger rod 22 slides to the upper limit position of the vertical section 26, the sliding ring 11 generates a downward reaction force under its own weight and the preload of the spring 13, pushing the trigger rod 22 to slide out along the one-way opening 28 of the blocking piece 27 at the lower end of the vertical section 26. Due to the limiting effect of the one-way opening 28 of the blocking piece 27, the trigger rod 22 cannot move back along the original path after sliding out, and the axial position of the locking ring 16 is locked, thus initially completing the locking. At this point, rotating the locking ring 16 again causes the trigger rod 22 to rotate synchronously, causing the end of the trigger rod 22 to engage in the recess 37 on the lower end face of the outer ring 8. Through the engagement between the recess 37 and the trigger rod 22, the trigger rod 22 is circumferentially positioned, preventing displacement of the trigger rod 22 due to equipment vibration or other factors in the locked state, further ensuring the stability of the lock. During the unlocking operation, simply continue rotating the locking ring 16 in the unlocking direction, causing the trigger rod 22 to disengage from the recess 37 and slide again to the intersection of the arc segment 25 and the vertical segment 26. At this point, the trigger rod 22 presses the sliding ring 11 upward again, causing the sliding ring 11 to unlock the limiting constraint of the ball 15. Then, the locking ring 16 can be pulled upward to complete the disassembly of the hot riveting head 6.

[0032] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A plastic multi-point hot riveting device with a detachable hot riveting head, comprising a heat-conducting pressure head (1), characterized in that: Two sets of heating coils (2) are respectively installed on both sides of the heat-conducting pressure head (1). Three sets of thermocouples (3) are installed on the front side of the heat-conducting pressure head (1). A heat-spreading plate (4) is installed inside the heat-conducting pressure head (1). Multiple connectors (5) are installed below the heat-spreading plate (4). Each connector (5) is equipped with a hot riveting head (6). The upper end of each hot riveting head (6) abuts against the heat-spreading plate (4). The connector (5) includes a threaded section (7). The lower end of the threaded section (7) is provided with a connected outer ring (8) and an inner ring (9) located inside the outer ring (8). A sliding cavity (10) is formed between the outer ring (8) and the inner ring (9). A sliding ring (11) is slidably disposed within the sliding cavity (10). A limiting ring (12) is provided inside the sliding ring (11). A spring (13) abuts against the limiting ring (12) and the threaded section (7). The inner ring (9)... Multiple engagement holes (14) are provided throughout, and each engagement hole (14) is provided with a ball (15). A locking ring (16) is provided below the threaded section (7). The upper end of the locking ring (16) can be inserted into the inner ring (9). The upper end of the locking ring (16) is provided with an engagement groove (17) that matches the engagement hole (14). When in the locked position, the limiting ring (12) is outside the ball (15) and the ball (15) is engaged in the engagement groove (17).

2. The plastic multi-point hot riveting device with a detachable hot riveting head according to claim 1, characterized in that: The hot riveting head (6) is provided with a shaft step (18) that matches the locking ring (16).

3. The plastic multi-point hot riveting device with a detachable hot riveting head according to claim 1, characterized in that: A trigger ring (19) is slidably sleeved on the locking ring (16). A limiting groove (20) is provided on the locking ring (16) along the axial direction. A limiting block (21) is provided on the inner side of the trigger ring (19). The limiting block (21) slides in the limiting groove (20). A trigger rod (22) is provided on the trigger ring (19). The side wall of the trigger rod (22) abuts against the lower end of the sliding ring (11). An annular groove (23) is provided on the locking ring (16). A second spring (24) is provided in the annular groove (23). The second spring (24) abuts against the trigger ring (19). A sliding groove is provided on the inner wall of the outer ring (8). Both ends of the sliding groove extend to the lower end face of the outer ring (8). The sliding groove includes a connected arc segment (25) and a vertical segment (26). The end of the trigger rod (22) slides in the sliding groove.

4. The plastic multi-point hot riveting device with a detachable hot riveting head according to claim 3, characterized in that: A blocking plate (27) is provided at the opening of the vertical section (26), and a one-way opening (28) is provided on the blocking plate (27).

5. The plastic multi-point hot riveting device with a detachable hot riveting head according to claim 2, characterized in that: The diameter of the upper section of the shaft step (18) of the hot riveting head (6) is greater than the diameter of the lower section of the shaft step (18).

6. The plastic multi-point hot riveting device with a detachable hot riveting head according to claim 1, characterized in that: The heat spreader (4) has a locking cavity (29) at its end. The locking cavity (29) contains two symmetrical balls (30). The two balls (30) abut against the ball (31). The heat spreader (4) has a locking bolt (32) at its end. The threaded end of the locking bolt (32) is connected to the ball (31). The balls (30) and the ball (31) are magnetically attracted. When the locking bolt (32) is tightened, the two balls (30) partially protrude out of the heat spreader (4).

7. The plastic multi-point hot riveting device with a detachable hot riveting head according to claim 1, characterized in that: A lower pressure plate (33) is connected above the heat-conducting pressure head (1), and a receiving plate (34) is provided below the heat-conducting pressure head (1). A guide post (35) is fixedly connected to the lower pressure plate (33), and the guide post (35) is slidably connected to the receiving plate (34). A spring three (36) is sleeved on the guide post (35), and the spring three (36) abuts against the lower pressure plate (33) and the receiving plate (34).

8. The plastic multi-point hot riveting device with a detachable hot riveting head according to claim 1, characterized in that: The lower end face of the limiting ring (12) is an inclined surface.

9. The plastic multi-point hot riveting device with a detachable hot riveting head according to claim 3, characterized in that: The lower end face of the outer ring (8) is provided with a recess (37).

Images