An automatic mold opening and closing mechanism for foaming molds

Abstract

This invention relates to the field of automotive headrest molding and foaming technology, and particularly to an automatic mold opening and closing mechanism for foaming molds. The mechanism includes a fixed frame, a mounting plate horizontally fixed to the upper side of the fixed frame, a fixed mold fixed to the side of the fixed frame and the lower side of the mounting plate, a movable mold rotatably mounted to the side of the fixed mold, a headrest assembly housed inside the fixed mold and the movable mold, a casting assembly fixed to the upper side of the fixed frame, a guide assembly inside the fixed mold and the movable mold, and a constraint assembly on the upper side of the movable mold corresponding to the headrest assembly position. This invention, through the coordinated operation of the guide assembly, constraint assembly, and casting assembly, provides multi-mode active constraint and protection for the headrest during the PIP (Potential Injection Molding) foaming process. Before injection, a negative pressure device ensures the headrest fits tightly against the mold cavity and eliminates wrinkles. After mold closing, the constraint assembly precisely positions the headrest rod, and a gas supply device introduces pressurized gas to maintain appropriate inflation inside the headrest.

Description

Technical Field

[0001] This invention relates to the field of automotive headrest molding and foaming technology, and in particular to an automatic mold opening and closing mechanism for foaming molds. Background Technology

[0002] Currently, the manufacturing process of automotive headrests is gradually shifting from the traditional wrap-around type to PIP (Plain In-Situ Foaming) technology. Traditional wrap-around headrests involve first foaming the core and then covering it with a cover. This process is not only cumbersome and inefficient, but the cover and foam core are also separate layers. Over time, the cover can loosen, slip, or even detach from the foam, affecting the headrest's aesthetics, comfort, and safety. PIP technology directly injects foam material into the pre-sewn cover, creating a one-time composite molding process. The resulting headrest has a full shape, a comfortable feel, and high assembly efficiency, making it the mainstream direction in the industry.

[0003] However, PIP technology faces numerous technical bottlenecks in its industrialization. Because the cover is a sewn structure, its seams and the fabric itself have micropores. In the initial stages of injection, the foaming material has low viscosity and high fluidity, making it prone to leakage under foaming pressure and overfilling. This leads to defects such as burrs, roughness, or dents on the product surface, severely impacting product yield. To prevent leakage during injection, existing technologies often use excessive catalysts to accelerate the reaction and rapidly increase system viscosity. However, this significantly increases raw material costs. Furthermore, the use of large amounts of catalysts results in higher odor and total volatile organic compound (TVOC) levels in the foamed products, making it difficult to meet increasingly stringent in-vehicle air quality standards. In addition, some solutions suppress leakage by compositing a polyurethane foam layer on the inside of the cover or introducing carbon dioxide-assisted foaming technology. However, the former increases material costs and process complexity, while the latter requires expensive specialized equipment and high-pressure foaming units, resulting in large equipment investments and high modification costs. Therefore, we propose an automatic mold opening and closing mechanism for the foaming mold. Summary of the Invention

[0004] In order to overcome the technical problems existing in the prior art, the present invention provides an automatic mold opening and closing mechanism for foaming molds.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: including a fixed frame, an mounting plate is horizontally fixedly installed on the upper side of the fixed frame, a fixed mold is fixedly arranged on the side of the fixed frame and the lower side of the mounting plate, a movable mold is rotatably arranged on the side of the fixed mold, an opening and closing cylinder is rotatably connected to the side of the fixed mold and the movable mold, a headrest assembly is arranged inside the fixed mold and the movable mold, a casting assembly is fixedly arranged on the upper side of the fixed frame, a guiding assembly is arranged inside the fixed mold and the movable mold, and a constraint assembly is arranged on the upper side of the movable mold corresponding to the position of the headrest assembly; The headrest assembly includes a face cover, a frame, and a headrest rod, and the face cover, frame, and headrest rod as a whole can be placed inside the fixed mold and the moving mold; The guiding component includes a negative pressure drainage component, which is located inside the fixed mold and the moving mold. The negative pressure drainage component performs negative pressure suction on the face before the material is injected. The sides of the fixed mold and the moving mold are provided with docking components, which can connect the negative pressure drainage components at the fixed mold and the moving mold. The side of the fixed mold is provided with a pressure applying component, which applies external pressure to the face during the injection of material, and the pressure can be controlled by itself. The constraint assembly includes two sets of limiting frames. The sides of the two sets of limiting frames are provided with limiting components and air blowing components. The limiting components can guide and magnetically fix the headrest rod. The air blowing components inflate the face cover by inhaling and exhaling gas. Together with the negative pressure drainage component, the face cover can be completely fitted into the interior of the fixed mold and the moving mold.

[0006] Furthermore, the device includes a fixed frame, an mounting plate is horizontally fixedly installed on the upper side of the fixed frame, a fixed mold is fixedly installed on the side of the fixed frame and the lower side of the mounting plate, a movable mold is rotatably installed on the side of the fixed mold, an opening and closing cylinder is rotatably connected to the side of the fixed mold and the movable mold, a headrest assembly is installed inside the fixed mold and the movable mold, a casting assembly is fixedly installed on the upper side of the fixed frame, a guide assembly is installed inside the fixed mold and the movable mold, and a constraint assembly is installed on the upper side of the movable mold corresponding to the position of the headrest assembly. Its characteristic is that the headrest assembly includes a face cover, a frame, and a headrest rod, and the face cover, frame, and headrest rod as a whole can be placed inside the fixed mold and the moving mold; The guiding component includes a negative pressure drainage component, which is located inside the fixed mold and the moving mold. The negative pressure drainage component performs negative pressure suction on the face before the material is injected. The sides of the fixed mold and the moving mold are provided with docking components, which can connect the negative pressure drainage components at the fixed mold and the moving mold. The side of the fixed mold is provided with a pressure applying component, which applies external pressure to the face during the injection of material, and the pressure can be controlled by itself. The constraint assembly includes two sets of limiting frames. The sides of the two sets of limiting frames are provided with limiting components and air blowing components. The limiting components can guide and magnetically fix the headrest rod. The air blowing components inflate the face cover by inhaling and exhaling gas. Together with the negative pressure drainage component, the face cover can be completely fitted into the interior of the fixed mold and the moving mold.

[0007] Furthermore, the injection tube is inserted into the inside of the faceplate, the frame is set inside the faceplate, and the headrest rods are symmetrically fixed on the sides of the frame. The headrest rods extend through the junction of the mounting plate and the moving mold.

[0008] Furthermore, the negative pressure drainage component includes a first guide groove and a second guide groove. The first guide groove is opened inside the fixed mold, and the second guide groove is opened inside the moving mold. The wall of the first guide groove has a first opening at equal intervals, and the wall of the second guide groove has a second opening at equal intervals. A connecting block is fixedly installed on the lower side of the fixed mold. An air cavity is opened through the bottom side of the connecting block. A first connecting groove is opened on the lower side of the fixed mold corresponding to the position of the air cavity. The first connecting groove is connected to the position inside the first guide groove. The other end of the first connecting groove passes through the fixed mold corresponding to the position of the moving mold. A connecting pipe is fixedly connected to the lower side of the connecting block and is connected to the inside of the air cavity. The connecting pipe is externally connected to the negative pressure device.

[0009] Furthermore, the docking component includes a fixed block fixedly installed on the side of the fixed mold corresponding to the position of the first connecting groove, a second connecting groove is opened on the side of the moving mold corresponding to the position of the fixed block and the second connecting groove is connected to the inside position of the second guide groove, a docking block is fixedly installed on the side of the moving mold corresponding to the position of the second connecting groove, a movable block is movably sleeved on the side of the docking block, and a support cylinder is fixedly connected between the sides of the movable block and the fixed block, and the support cylinder is partially movably sleeved on the side of the fixed block.

[0010] Furthermore, the pressure-applying component includes a connecting valve located on the side of the fixed mold near the fixed frame. An air supply groove is fixedly installed on the side of the fixed mold corresponding to the position of the connecting valve, and the air supply groove is connected to the inside of the first guide groove. The air supply groove can be connected to an external feeding device. A plug is installed through and snapped onto the side of the connecting block. A movable rod is fixedly connected to the side of the plug and is movably disposed inside the air cavity through the connecting block. A spring is provided between the side of the movable rod and the wall of the air cavity, and the spring is movably sleeved on the side of the movable rod.

[0011] Furthermore, the two sets of limiting frames are symmetrically fixedly installed on the upper side of the moving mold, and the headrest rod is extended and movably arranged on the inner side of the limiting frame. The limiting component includes magnetic blocks that are equidistantly fixedly installed on the inner side of the limiting frame. A constraint plate is mirror-arranged on the inner side of the limiting frame and the constraint plate is attached to the upper side of the limiting frame. Locking screws are symmetrically threaded on the upper side of the limiting frame, and a rectangular groove is opened on the side of the constraint plate to slide and fit on the side of the locking screw.

[0012] Furthermore, the air blowing component includes a mating block fixedly installed on the side of the limiting frame near the mounting plate. The mating block has a mating groove on the side near the limiting frame. Air holes penetrating the mating block are equidistantly opened on the wall of the mating groove. A matching groove penetrating the mating groove is opened on the side of the limiting frame corresponding to the position of the mating groove. A diverter pipe is fixedly installed inside the matching groove and connected to the air supply device.

[0013] Compared with the prior art, the beneficial effects that this invention can achieve are: 1. This invention utilizes the coordinated operation of guiding components, constraint components, and casting components to provide multi-mode active constraint and protection for the face cover throughout the entire PIP injection foaming process. Before injection, a negative pressure device ensures the face cover fits tightly against the mold cavity and eliminates wrinkles. After mold closing, the constraint components precisely position the headrest rod, and the air supply device introduces pressurized gas to maintain moderate inflation inside the face cover. During the injection and foaming stages, carbon dioxide is uniformly pressurized from the outside of the face cover, forming a dynamic balance with the internal air pressure, effectively preventing low-viscosity foaming material from leaking out through the seam pores. The pressure relief structure automatically controls the air supply pressure to avoid damage to the face cover surface. Thus, throughout the entire molding process, the face cover remains stably attached to the inner wall of the mold cavity, ensuring a full shape of the finished product. Furthermore, it eliminates the need for excessive catalysts or the introduction of other equipment, reducing raw material and equipment input costs and improving the odor and total volatile carbon index of the foam products.

[0014] 2. This invention opens guide grooves and openings inside the mold cavities of the fixed mold and the moving mold, and uses a negative pressure device to apply negative pressure to the side of the face sleeve before and at the beginning of mold closing, so that the face sleeve is tightly attached to the inner wall of the mold cavity before pouring, eliminating wrinkles and loose areas on the surface of the face sleeve, and avoiding the problem of foam material leakage due to gaps between the face sleeve and the mold cavity.

[0015] 3. This invention, by opening mating grooves and air holes in the mating block and connecting an external air supply device, continuously introduces pressurized gas into the inside of the mating sleeve after the negative pressure suction mating sleeve adheres to the mold cavity, so that the inside of the mating sleeve remains in a moderately bulging state. When the foaming material exerts an outward extrusion force on the mating sleeve during the foaming agent injection process, the internal air pressure can provide reverse support. Combined with the negative pressure adsorption force on the outside of the mating sleeve, the mating sleeve is always stably attached to the surface of the mold cavity, effectively preventing the mating sleeve from bulging or sinking locally due to fluctuations in foaming pressure, thus ensuring the fullness and consistency of the finished product's shape.

[0016] 4. This invention, by setting a connecting valve and an air supply groove on the side of the fixed mold, introduces carbon dioxide gas between the outer side of the cover and the mold cavity during the foaming agent injection and foaming molding stages. A uniform gas pressure layer is formed between the outer wall of the cover and the inner wall of the mold cavity. This pressure layer applies a continuous and uniform pressing force to the cover from the outside, forming an internal and external balance with the internal pressure gas of the cover. This effectively prevents low-viscosity foaming material from seeping out of the cover seam pores and avoids indentation or dent damage to the cover surface caused by excessive external air pressure. This solves the material leakage problem in the PIP process and improves the product qualification rate.

[0017] 5. This invention provides a pressure relief structure consisting of a plug, a movable rod, and a spring at the end of the air chamber. When the carbon dioxide pressure input from the air supply groove exceeds a set threshold, the pressure relief channel is automatically opened to release excess gas. This avoids excessive pressure on the outer side of the mask due to fluctuations or abnormal increases in air supply pressure, which can cause surface depressions. This ensures the safety of the air supply system and keeps the carbon dioxide pressurization process within a safe and controllable pressure range, thereby improving the stability of the molding quality.

[0018] 6. This invention, by setting a limiting frame, magnetic block and adjustable constraint plate in the constraint component, mechanically guides and magnetically positions the headrest rod when the moving mold closes, ensuring that the headrest component is placed in the mold with precise and consistent position, avoiding molding defects such as face cover skewing and frame misalignment caused by headrest rod offset or shaking during mold closing. At the same time, the position of the constraint plate is adjustable, which can adapt to the production needs of headrest products of different specifications and improve the versatility of the mold.

[0019] 7. By setting up a docking block, a movable block and an elastic corrugated support cylinder, the present invention realizes the automatic docking and separation of the first connecting groove and the second connecting groove during the opening and closing of the moving mold. This ensures that the negative pressure channel and the air passage can be automatically connected or cut off with the movement of the moving mold, regardless of whether the mold is in the open or closed state. There is no need for manual insertion or removal of pipelines, which ensures the reliability of the continuous operation of the production line and the air passage connection. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a cross-sectional structural diagram of the present invention; Figure 3 This is a partial structural schematic diagram of the casting assembly of the present invention; Figure 4 This is a schematic diagram showing the installation position of a portion of the guiding component of the present invention; Figure 5 For the present invention Figure 2 A magnified structural diagram at point A; Figure 6 For the present invention Figure 2 A magnified structural diagram at point B; Figure 7 For the present invention Figure 2 Enlarged structural diagram at point C Figure 8 This is a partial structural cross-sectional schematic diagram of the present invention; Figure 9 This is a partial structural cross-sectional schematic diagram of the constraint component of the present invention; Figure 10 For the present invention Figure 8 A magnified structural diagram at point D; Figure 11This is a schematic diagram illustrating the structure, installation, and use of the constraint component of the present invention; Figure 12 This is an exploded view of the headrest assembly of the present invention.

[0021] The components include: 1. Fixed frame; 11. Mounting plate; 12. Fixed mold; 13. Moving mold; 14. Opening and closing cylinder; 2. Casting assembly; 21. Lifting cylinder; 22. Connecting plate; 23. Injection pipe; 24. First constraint frame; 25. Second constraint frame; 3. Guiding assembly; 31. First guide groove; 311. First opening; 32. Second guide groove; 321. Second opening; 33. Connecting block; 331. Air cavity; 332. First connecting groove; 333. Connecting pipe; 34. Fixed block; 3 41. Connecting block; 342. Movable block; 343. Support cylinder; 344. Second connecting groove; 35. Connecting valve; 351. Air supply groove; 36. Block; 361. Movable rod; 362. Spring; 4. Constraint assembly; 41. Limiting frame; 411. Magnetic block; 42. Constraint plate; 43. Locking screw; 44. Mating block; 441. Mating groove; 442. Air hole; 45. Pairing groove; 46. Diverter pipe; 5. Headrest assembly; 51. Face cover; 52. Frame; 53. Headrest rod. Detailed Implementation

[0022] To make the technical means, creative features, and achieved objectives and effects of this invention easier to understand, the invention is further described below with reference to specific embodiments. However, the following embodiments are merely preferred embodiments of this invention and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments described herein without creative effort are all within the protection scope of this invention. Unless otherwise specified, the experimental methods in the following embodiments are conventional methods, and the materials and reagents used in the following embodiments are commercially available unless otherwise specified.

[0023] Example: Figure 1 and Figure 2As shown, an automatic mold opening and closing mechanism for a foaming mold includes a fixed frame 1, which is a rectangular frame made of steel plates. A mounting plate 11, also rectangular, is horizontally fixed to the upper side of the fixed frame 1. A fixed mold 12 is fixedly arranged on the side of the fixed frame 1 and is connected to the lower side of the mounting plate 11 by a triangular block. A mold cavity is provided on the side of the fixed mold 12. A movable mold 13 is fitted on the upper side of the fixed mold 12. The side of the movable mold 13 is hinged to the side of the fixed mold 12 and also has a mold cavity. The fixed mold 12 and the movable mold 13, when combined, form a material cavity. Opening and closing cylinders 14 are inclined and symmetrically arranged on the sides of the fixed mold 12 and the movable mold 13. The body and piston rod ends are rotatably mounted on the sides of the fixed mold 12 and the moving mold 13, respectively. When the opening and closing cylinder 14 is pushed, the moving mold 13 can rotate on the side of the fixed mold 12. A headrest assembly 5 is provided inside the fixed mold 12 and the moving mold 13. A casting assembly 2 is fixedly provided on the upper side of the fixed frame 1. Foaming agent is injected into the headrest assembly 5 through the casting assembly 2, so that it is integrally formed with the headrest assembly 5. A guide assembly 3 is provided on the inner side of the fixed mold 12 and the moving mold 13 corresponding to the headrest assembly 5. The guide assembly 3 can constrain and guide the headrest assembly 5. A constraint assembly 4 is provided on the upper side of the moving mold 13 corresponding to the headrest assembly 5. The constraint assembly 4 can cooperate with the guide assembly 3 to effectively constrain the headrest assembly 5, so as to improve the molding quality of the product.

[0024] like Figures 2 to 4 As shown, the casting assembly 2 includes a lifting cylinder 21. The output of the lifting cylinder 21 is fixedly installed on the upper side of the mounting plate 11. A connecting plate 22 is horizontally fixedly installed at the output end of the lifting cylinder 21. An injection pipe 23 is snapped onto the side of the connecting plate 22, and the bottom of the injection pipe 23 extends into the interior of the moving mold 13. A first constraint frame 24 is fixedly installed on the upper side of the mounting plate 11, and a second constraint frame 25 is fixedly installed on the upper side of the moving mold 13. The first constraint frame 24 and the second constraint frame 25 can be fitted together on the side of the injection pipe 23. Specifically... The lifting cylinder 21 pushes the connecting plate 22, which drives the injection pipe 23 to move upward. At this time, the opening and closing cylinder 14 can push the moving mold 13 to rotate and open on the side of the fixed mold 12, so that the headrest assembly 5 can be placed inside the mold cavity of the fixed mold 12. Then, the lifting cylinder 21 pulls the connecting plate 22, which drives the injection pipe 23 to move downward. At this time, the opening and closing cylinder 14 can pull the moving mold 13 to rotate and reset on the side of the fixed mold 12. The moving mold 13 and the fixed mold 12 together constrain the headrest assembly 5, and the foaming agent can be injected into the headrest assembly 5 through the injection pipe 23.

[0025] like Figure 2 and Figures 4 to 8As shown, the guide assembly 3 includes a first guide groove 31 and a second guide groove 32. The first guide groove 31 is formed inside the fixed mold 12, and the second guide groove 32 is formed inside the moving mold 13. The first guide groove 31 and the second guide groove 32 correspond to the mold cavity positions of the fixed mold 12 and the moving mold 13, respectively. A first opening 311 penetrating the fixed mold 12 to its inner side is formed at equal intervals on the wall of the first guide groove 31. A second opening 321 penetrating the moving mold 13 to its inner side is formed at equal intervals on the wall of the second guide groove 32. A connecting block 33 is fixedly installed on the lower side of the fixed mold 12. An air cavity 331 penetrating the connecting block 33 is formed on the bottom side of the connecting block 33. The air cavity 331 is a cylindrical cavity with a cross-shaped stepped hole inside. The lower side of the fixed mold 12 corresponds to the air cavity 33. A first connecting groove 332 is provided at position 1, connecting to the interior of the first guide groove 31. The other end of the first connecting groove 332 passes through the fixed mold 12 corresponding to the position of the moving mold 13. The first connecting groove 332 has a structure where one input channel branches into two output channels. A connecting pipe 333 is fixedly connected to the lower side of the connecting block 33 and connects to the interior of the air chamber 331. The connecting pipe 333 is externally connected to the negative pressure device. A fixing block 34 is fixedly installed on the side of the fixed mold 12 corresponding to the position of the first connecting groove 332. The fixing block 34 is a cylindrical block with a cross-shaped cross section. A second connecting groove 344 is provided on the side of the moving mold 13 corresponding to the position of the fixing block 34 and connects to the interior of the second guide groove 32. A docking block 341 is fixedly installed on the side of the moving mold 13 corresponding to the position of the second connecting groove 344. The docking block 341 is a cylindrical block with a convex cross-section. A movable block 342 is movably sleeved on the side of the docking block 341. The movable block 342 is a circular block. A support cylinder 343 is fixedly connected between the movable block 342 and the side of the fixed block 34, and the support cylinder 343 is partially movably sleeved on the side of the fixed block 34. The support cylinder 343 is an axially expandable elastic bellows. Specifically, the negative pressure device performs negative pressure suction and exhaust operation through the fixed block 34. At this time, the airflow can flow into the first guide groove 31 through the first opening 311, and then into the air chamber 331 through the first connecting groove 332. The synchronous airflow can pass through the second connecting groove 344. The flow from the opening 321 into the second guide groove 32, through the second connecting groove 344, the docking block 341, the movable block 342, the support cylinder 343, and the fixed block 34, flows into the air cavity 331 through the first connecting groove 332. In this way, the inner sides of the fixed mold 12 and the moving mold 13 can generate negative pressure suction constraint on the headrest assembly 5. When the moving mold 13 rotates and opens, the docking block 341 can move with the moving mold 13 and disengage from the movable block 342. When the moving mold 13 closes and combines with the fixed mold 12, the docking block 341 can be inserted into the movable block 342. The support cylinder 343 provides elastic support to the movable block 342, so that when the docking block 341 is inserted into the movable block 342, a squeezing and relief occurs, ensuring that the movable block 342 can be effectively fitted onto the side of the docking block 341. A connecting valve 35 is provided on the side of the fixed mold 12 near the fixed frame 1. An air supply groove 351 is fixedly installed on the side of the fixed mold 12 corresponding to the position of the connecting valve 35 and is connected to the inside of the first guide groove 31. The air supply groove 351 can be connected to an external feeding device. A blocking block 36 is installed through and snapped onto the side of the connecting block 33. A movable rod 361 is fixedly connected to the side of the blocking block 36 and is movably disposed inside the air cavity 331 through the connecting block 33. The movable rod 361 is a "T"-shaped round rod. A spring 362 is provided between the side of the movable rod 361 and the wall of the air cavity 331 and is movably sleeved on the side of the movable rod 361. Specifically, foaming agent is injected into the headrest assembly 5 through the injection pipe 23. At this time, the feeding device can deliver carbon dioxide to the inside of the connecting valve 35 through the air supply groove 351. The carbon dioxide flows in The carbon dioxide flows from the first opening 311 into the side of the headrest assembly 5 through the first guide groove 31. Simultaneously, carbon dioxide flows through the first connecting groove 332, through the fixed block 34, the movable block 342, the support cylinder 343, and the second connecting groove 344 into the second guide groove 32. It then flows out from the second opening 321 into the side of the headrest assembly 5. At this time, the carbon dioxide applies pressure to the side of the headrest assembly 5 to protect it, which can effectively prevent the foaming agent from seeping out of the headrest assembly 5. The carbon dioxide can flow into the air chamber 331 through the first connecting groove 332. When the carbon dioxide pressure is too high, the carbon dioxide can flow through the side of the movable rod 361 to push the block 36. The movable rod 361, in conjunction with the compression spring 362, deforms, causing the block 36 to detach from the side of the connecting block 33 to release the pressure, thus preventing the side of the headrest assembly 5 from being dented due to excessive carbon dioxide pressure.

[0026] like Figure 2 , Figure 8 and Figures 10 to 12 As shown, the headrest assembly 5 includes a cover 51, which is a hollow pillowcase. The cover 51 is positioned between the fixed mold 12 and the moving mold 13. The injection tube 23 is inserted into the interior of the cover 51. Inside the cover 51, there is a frame 52, which is an "L"-shaped frame. Headrest rods 53 are symmetrically fixed on the side of the frame 52 and extend through the junction of the mounting plate 11 and the moving mold 13. The headrest rods 53 correspond to the position of the constraint assembly 4. Specifically, the headrest assembly 5 is placed in the fixed mold 12. When the mold 12 and the moving mold 13 are inside, the first opening 311 and the second opening 321 are subjected to negative pressure suction. At this time, the side of the cover 51 is attracted by the negative pressure and adheres to the inner position of the fixed mold 12 and the moving mold 13. The subsequent injection pipe 23 injects foaming agent into the inside of the cover 51. The foaming agent foams and forms a shape. At this time, the negative pressure device stops operating, and the connecting valve 35 inputs carbon dioxide and discharges it from the first opening 311 and the second opening 321 to the side of the cover 51. Pressure is applied to the side of the cover 51 to ensure that the foaming agent does not penetrate from the side of the cover 51.

[0027] like Figures 8 to 11As shown, the constraint assembly 4 includes two sets of limiting frames 41, which are symmetrically fixedly installed on the upper side of the moving mold 13. The headrest rod 53 extends and is movably disposed on the inner side of the limiting frame 41. The limiting frame 41 is a "U"-shaped frame. Magnetic blocks 411 are equidistantly fixedly installed through the inner side of the limiting frame 41. The magnetic blocks 411 are cylindrical magnetic blocks that can magnetically attract and fix the headrest rod 53. A constraint plate 42 is mirror-arranged on the inner side of the limiting frame 41 and is attached to the upper side of the limiting frame 41. The constraint plate 42 is an "L"-shaped plate with an arc-shaped lower side. The constraint plate 42 is positioned opposite the side of the headrest rod 53. To constrain the device, locking screws 43 are symmetrically threaded on the upper side of the limiting frame 41, and a rectangular groove is opened on the side of the constraint plate 42 to slide and fit onto the side of the locking screws 43. A mating block 44 is fixedly installed on the side of the limiting frame 41 near the mounting plate 11. The mating block 44 is a "U"-shaped block. A mating groove 441 is opened on the side of the mating block 44 near the limiting frame 41. The mating groove 441 is a "Y"-shaped groove. Air holes 442 penetrating the mating block 44 are opened at equal intervals on the wall of the mating groove 441. A mating groove 45 penetrating the mating groove 441 is opened on the side of the limiting frame 41 corresponding to the position of the mating groove 441. An internally fixed diversion pipe 46 is connected to the air supply device. Specifically, before injection, the locking screw 43 is loosened so that the constraint plate 42 can slide and adjust its position on the side of the limit frame 41 to accommodate different specifications of headrest rods 53. Tightening the locking screw 43 fixes the constraint plate 42. After the moving mold 13 is opened, the headrest assembly 5 is placed inside the fixed mold 12. Then the moving mold 13 is rotated and reset to close. At this time, the limit frame 41 is attached to the side of the headrest rod 53. While the constraint plate 42 guides the headrest rod 53, the magnetic block 411 attracts the headrest rod 53 to fix it. The load device then operates. The first opening 311 and the second opening 321 apply negative pressure to the face sleeve 51 so that it fits against the inner side of the fixed mold 12 and the moving mold 13. The synchronous air supply device delivers pressurized gas through the diversion pipe 46. The pressurized gas flows into the mating groove 45 through the diversion pipe 46, and then flows into the mating groove 441 from the mating groove 45 and is discharged from the air hole 442. At this time, the pressurized gas blown out by the connecting plate 22 of the constraint component 4 flows into the face sleeve 51 from the side of the headrest rod 53. The pressurized gas can cooperate with the negative pressure suction to make the face sleeve 51 fully filled and bulged to fit against the inner side of the mold cavity of the fixed mold 12 and the moving mold 13, ensuring the quality of the finished product.During injection, the injection pipe 23 injects foaming agent into the sleeve 51. The negative pressure device stops moving. At this time, the feeding device supplies carbon dioxide to the connecting valve 35. The carbon dioxide is discharged from the first opening 311 and the second opening 321 to pressurize the side of the sleeve 51. Simultaneously, pressurized gas is continuously supplied to maintain the internal pressure of the sleeve 51, ensuring that the sleeve 51 always adheres to the inner position of the fixed mold 12 and the moving mold 13 when pressed by carbon dioxide. After foaming and molding, the foaming agent is integrated with the sleeve 51, the frame 52, and the headrest rod 53. At this time, the moving mold 13 can be opened to remove the finished product.

[0028] Working principle: Before injection: First, the lifting cylinder 21 pushes the connecting plate 22 to move the injection tube 23 upward. Then, the opening and closing cylinder 14 pushes the moving mold 13 to rotate and open on the side of the fixed mold 12. At this time, the headrest assembly 5 is placed into the inner cavity of the fixed mold 12. The negative pressure device is activated and the negative pressure suction is applied to the side of the sleeve 51 through the first opening 311 to guide it to fit against the inner position of the fixed mold 12. In the second step, the lifting cylinder 21 pulls the injection tube 23 downward, causing it to be inserted into the inside of the face sleeve 51. Then, the opening and closing cylinder 14 pulls the moving mold 13 to rotate and close on the side of the fixed mold 12. The moving mold 13 and the inner mold cavity of the fixed mold 12 cover the headrest assembly 5. At this time, the mating block 341 on the side of the moving mold 13 presses against the movable block 342, causing the support cylinder 343 to deform. Under the elastic support of the support cylinder 343, the movable block 342 fits onto the side of the mating block 341, completing the second step. When the connecting groove 344 is connected to the first connecting groove 332, the second opening 321 is negatively attracted to other positions on the side of the opposite sleeve 51 and guided to fit against the inner position of the moving mold 13. When the moving mold 13 rotates and closes, the first constraint frame 24 and the second constraint frame 25 cooperate to constrain the injection tube 23. The limiting frame 41 is inserted into the side of the headrest rod 53 and the headrest rod 53 is guided by the constraint plate 42, so that the headrest rod 53 is magnetically attracted and fixed by the magnetic block 411, and the headrest rod 53 is constrained and positioned. The third step involves the operation of the air supply device, which inputs pressurized gas through the diversion pipe 46. After flowing into the mating groove 45, the pressurized gas flows through the mating groove 441 and is discharged from the air hole 442. The pressurized gas is blown out parallel to the side of the headrest rod 53 and blown into the inside of the mask 51 through the side of the headrest rod 53. The pressurized gas, in conjunction with the negative pressure suction, causes the mask 51 to bulge and fit snugly against the inside of the mold cavity of the fixed mold 12 and the moving mold 13, thus eliminating wrinkles in the entire mask. During material injection: First, foaming agent is injected through injection pipe 23. The foaming agent fills the inside of the cover 51 and wraps the sides of the frame 52 and headrest rod 53. At this time, the air supply device continuously supplies pressurized gas to keep the inside of the cover 51 in an inflated state. The negative pressure device slowly stops operating. In the second step, after the load device stops completely, the feeding device starts to operate. Carbon dioxide is input into the connecting valve 35 through the air supply groove 351. The first guide groove 31 and the second guide groove 32 are connected through the first connecting groove 332 and the second connecting groove 344. Carbon dioxide is discharged to the side of the cover 51 through the first opening 311 and the second opening 321 to apply pressure. The foaming agent foams and forms inside the cover 51 at the same time. The carbon dioxide applies pressure to the side of the cover 51 to prevent the foaming agent from seeping from the side of the cover 51. At the same time, the pressure gas continuously blown out of the air hole 442 keeps the cover 51 in an inflated state to prevent the side of the cover 51 from being dented. Third, while the feeding device supplies carbon dioxide to apply pressure, the carbon dioxide flows into the gas chamber 331 through the first connecting groove 332. When the carbon dioxide pressure is too high, the carbon dioxide moves outward from the side of the movable rod 361 by pushing the block 36 to overcome the elastic force of the spring 362, opening the pressure relief channel. The carbon dioxide is discharged from the side of the block 36 to complete the pressure relief, avoiding excessive pressure and indentation on the side of the sleeve 51 caused by excessive carbon dioxide pressure.

[0029] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention.

Claims

1. An automatic mold opening and closing mechanism for a foaming mold, comprising a fixed frame (1), an mounting plate (11) is horizontally fixedly installed on the upper side of the fixed frame (1), a fixed mold (12) is fixedly arranged on the side of the fixed frame (1) and the lower side of the mounting plate (11), a moving mold (13) is rotatably arranged on the side of the fixed mold (12), an opening and closing cylinder (14) is rotatably connected to the side of the fixed mold (12) and the moving mold (13), a headrest assembly (5) is arranged inside the fixed mold (12) and the moving mold (13), a casting assembly (2) is fixedly arranged on the upper side of the fixed frame (1), a guide assembly (3) is arranged inside the fixed mold (12) and the moving mold (13), and a constraint assembly (4) is arranged on the upper side of the moving mold (13) corresponding to the position of the headrest assembly (5); Its features are: The headrest assembly (5) includes a face cover (51), a frame (52) and a headrest rod (53), and the face cover (51), frame (52) and headrest rod (53) can be placed inside the fixed mold (12) and the moving mold (13) as a whole; The guiding component (3) includes a negative pressure drainage component, which is located inside the fixed mold (12) and the moving mold (13). The negative pressure drainage component performs negative pressure suction on the sleeve (51) before material injection. The fixed mold (12) and the moving mold (13) are provided with docking components on their sides. The docking components can connect the negative pressure drainage components at the fixed mold (12) and the moving mold (13). A pressure applying component is provided on the side of the fixed mold (12). The pressure applying component applies external pressure to the sleeve (51) when material is injected, and the pressure itself can be controlled. The constraint component (4) includes two sets of limiting frames (41). The sides of the two sets of limiting frames (41) are provided with limiting components and air blowing components. The limiting components can guide and magnetically fix the headrest rod (53). The air blowing components inflate the face cover (51) by introducing and releasing gas. In conjunction with the negative pressure drainage component, the face cover (51) is completely fitted inside the fixed mold (12) and the moving mold (13).

2. The automatic mold opening and closing mechanism for a foaming mold according to claim 1, characterized in that: The casting assembly (2) includes a lifting cylinder (21). The output of the lifting cylinder (21) is fixedly installed on the upper side of the mounting plate (11). A connecting plate (22) is fixedly installed horizontally at the output end of the lifting cylinder (21). An injection pipe (23) is snapped onto the side of the connecting plate (22). A first constraint frame (24) is fixedly installed on the upper side of the mounting plate (11), and a second constraint frame (25) is fixedly installed on the upper side of the moving mold (13).

3. An automatic mold opening and closing mechanism for a foaming mold according to claim 2, characterized in that: The injection tube (23) is inserted into the inside of the faceplate (51), the frame (52) is set inside the faceplate (51), the headrest rod (53) is symmetrically fixed on the side of the frame (52), and the headrest rod (53) extends through the hinge position of the mounting plate (11) and the moving mold (13).

4. An automatic mold opening and closing mechanism for a foaming mold according to claim 3, characterized in that: The negative pressure drainage component includes a first guide groove (31) and a second guide groove (32). The first guide groove (31) is located inside the fixed mold (12), and the second guide groove (32) is located inside the moving mold (13). The wall of the first guide groove (31) is provided with first openings (311) at equal intervals, and the wall of the second guide groove (32) is provided with second openings (321) at equal intervals. A connecting block (33) is fixedly installed on the lower side of the fixed mold (12), and a through-hole is provided on the bottom side of the connecting block (33). The air cavity (331) of the fixed mold (12) is provided with a first connecting groove (332) on the lower side corresponding to the position of the air cavity (331). The first connecting groove (332) is connected to the position inside the first guide groove (31). The other end of the first connecting groove (332) passes through the fixed mold (12) corresponding to the position of the moving mold (13). The lower side of the connecting block (33) is fixedly connected to a connecting pipe (333) and the connecting pipe (333) is connected to the inside of the air cavity (331). The connecting pipe (333) is connected to the negative pressure device.

5. An automatic mold opening and closing mechanism for a foaming mold according to claim 4, characterized in that: The docking component includes a fixed block (34) fixedly installed on the side of the fixed mold (12) at the position corresponding to the first connecting groove (332). The side of the moving mold (13) is provided with a second connecting groove (344) at the position corresponding to the fixed block (34), and the second connecting groove (344) is connected to the inside of the second guide groove (32). A docking block (341) is fixedly installed on the side of the moving mold (13) at the position corresponding to the second connecting groove (344). A movable block (342) is movably sleeved on the side of the docking block (341). A support cylinder (343) is fixedly connected between the side of the movable block (342) and the side of the fixed block (34), and part of the support cylinder (343) is movably sleeved on the side of the fixed block (34).

6. An automatic mold opening and closing mechanism for a foaming mold according to claim 5, characterized in that: The pressure-applying component includes a connecting valve (35) located on the side of the fixed mold (12) near the fixed frame (1). A gas supply groove (351) is fixedly installed on the side of the fixed mold (12) corresponding to the position of the connecting valve (35), and the gas supply groove (351) is connected to the inside of the first guide groove (31). The gas supply groove (351) can be connected to an external feeding device. A plug (36) is installed through the side of the connecting block (33). A movable rod (361) is fixedly connected to the side of the plug (36), and the movable rod (361) passes through the connecting block (33) and is movably disposed inside the air cavity (331). A spring (362) is provided between the side of the movable rod (361) and the wall of the air cavity (331), and the spring (362) is movably sleeved on the side of the movable rod (361).

7. An automatic mold opening and closing mechanism for a foaming mold according to claim 6, characterized in that: Two sets of limiting frames (41) are symmetrically fixedly installed on the upper side of the moving mold (13). The headrest rod (53) extends and is movably installed on the inner side of the limiting frame (41). The limiting component includes magnetic blocks (411) that are equidistantly fixedly installed on the inner side of the limiting frame (41). A constraint plate (42) is mirror-installed on the inner side of the limiting frame (41) and the constraint plate (42) is attached to the upper side of the limiting frame (41). A locking screw (43) is symmetrically threaded on the upper side of the limiting frame (41) and a rectangular groove is opened on the side of the constraint plate (42) to slide and fit on the side of the locking screw (43).

8. An automatic mold opening and closing mechanism for a foaming mold according to claim 7, characterized in that: The air blowing component includes a mating block (44) fixedly installed on the side of the limiting frame (41) near the mounting plate (11). The mating block (44) has a mating groove (441) on the side near the limiting frame (41). The wall of the mating groove (441) has air holes (442) that penetrate the mating block (44) at equal intervals. The side of the limiting frame (41) has a pairing groove (45) that penetrates the mating groove (441). A diverter pipe (46) is fixedly installed inside the pairing groove (45). The diverter pipe (46) is connected to the air supply device.

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