Plastic chair injection mold with multi-sliding-block demolding mechanism

Abstract

The invention relates to a plastic chair injection mold with a multi-sliding-block demolding mechanism. The plastic chair injection mold comprises a core mold, a cavity mold, an ejection mechanism and two core pulling mechanisms. A first insert for forming a chair seat is arranged in the core mold in a sliding mode in the mold opening and closing direction, a base is fixedly installed on the first insert, and the two core pulling mechanisms are arranged on the base, located on the two sides of the first insert and used for demolding of armrests and corresponding chair legs. The mold further comprises a first driving part and a second insert for forming the cover plate, the first insert is provided with a groove, the second insert is rotationally arranged in the groove, the first driving part drives the second insert to rotate, and a plurality of pouring gates communicated with the cover plate and the seat forming cavity are arranged in the circumferential direction of the second insert. The ejection mechanism is arranged on the base and can eject the plastic chair body and the cover plate out. According to the mold, the plastic chair body and the cover plate are integrated in one set of mold to be molded, and the plastic chair body and the cover plate are separated and synchronously ejected out by rotating and snapping a pouring material through the second insert, so that the number of molds is reduced, the mold opening cost and field occupation are reduced, and the production efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of molds, and in particular to a plastic chair injection mold with a multi-slider demolding mechanism. Background Technology

[0002] Three possible combinations of plastic chairs with toilet seats and urinals, as follows: Figure 1 As shown, the chair includes a plastic chair body 1, which comprises a backrest 11, a seat 12, two armrests 13, and four legs 14. The seat 12 has through holes, and two metal reinforcing frames 19 are fixedly mounted below the seat 12 with screws. These reinforcing frames 19 not only support the seat 12 and improve its structural strength, but also serve as mounting brackets for the cover 15 and the toilet bowl 16. Figure 2 and Figure 3 As shown, the reinforcing frame 19 is provided with protrusions 17, and the cover plate 15 and the toilet bowl 16 are provided with two concave grooves 18 that mate with the two protrusions 17. Through the snap-fit ​​engagement of the protrusions 17 and the concave grooves 18, the cover plate 15 and the toilet bowl 16 can be quickly disassembled and replaced. At the same time, the cover plate 15 can also be directly engaged with the toilet bowl 16 as a lid.

[0003] When the cover is installed, the plastic chair functions as a normal chair. When the commode is installed, the plastic chair can be converted into a commode chair for people with mobility impairments, the elderly, and patients. Users can sit directly on the seat to use the toilet without bending over or squatting, effectively reducing the difficulty of using the toilet for people with mobility impairments and improving safety and convenience.

[0004] The production of the aforementioned plastic chair body, along with its matching cover and commode, requires the development of three separate injection molds. This not only significantly increases mold development and opening costs but also occupies more production and storage space. Furthermore, the three molds correspond to multiple independent production processes, which reduces production efficiency. Summary of the Invention

[0005] In order to improve the production efficiency of plastic chairs and their covers and toilet accessories, this application provides a plastic chair injection mold with a multi-slider demolding mechanism.

[0006] The technical solution for a plastic chair injection mold with a multi-slider demolding mechanism provided in this application is as follows: A plastic chair injection mold with a multi-slider demolding mechanism includes a core mold, a cavity mold, an ejection mechanism and two core-pulling mechanisms disposed on the core mold. A first insert for molding a chair seat is slidably installed in the core mold along the mold opening and closing direction. A base is fixedly installed on the first insert. The two core-pulling mechanisms are disposed on the base and are located on both sides of the first insert, for demolding the two armrests and the corresponding side chair legs. It also includes a first driving component and a second insert. The second insert is used to form the cover plate. The first insert has a groove. The second insert is rotatably disposed in the groove. The first driving component is used to drive the second insert to rotate along the axis. Several sprues are sequentially formed on the second insert along the circumferential direction. The two ends of the sprues are respectively connected to the molding cavity where the cover plate and the chair seat are located. The ejection mechanism is disposed on the base and is used to eject the plastic chair body and the cover plate.

[0007] By adopting the above technical solution, the plastic chair body and cover, which originally required two separate molds, can be integrated into a single injection mold for production. A groove is created in the first insert, and a second insert for molding the cover is rotatably positioned. A drive component drives the second insert to rotate, breaking the connecting sprue between the cover and the plastic chair body, separating the cover and the chair body. An ejection mechanism then ejects both simultaneously. This effectively reduces the number of molds required, lowers mold development costs and production space requirements, and significantly improves the production efficiency of the plastic chair and its accessories through process integration.

[0008] Preferably, the core-pulling mechanism includes a second driving component, a third driving component, a fourth driving component, a main pulling block, a first pulling block, a forming limiting block, and a limiting component. The main pulling block is slidably connected to the base along the core-pulling direction and is used to form the connection between the chair legs and the armrests and the chair back. The second driving component is disposed on the main pulling block and the core mold and is used to drive the main pulling block to move along the mold opening and closing direction. The third driving component is disposed on the main pulling block and is used to drive the first pulling block to slide along the core-pulling direction. The first pulling block is used to form the bends of the armrests and the chair legs. The forming limiting block is slidably connected to the main pulling block along a sliding direction parallel to the sliding direction of the main pulling block on the base and is used to form the main body of the armrest. The limiting component is used to restrict the main pulling block to slide only along the mold opening and closing direction. The fourth driving component is used to drive the main pulling block to slide on the base along the core-pulling direction.

[0009] By adopting the above technical solution, after mold opening, drive component two drives the main pull block to move along the mold opening and closing direction. The main pull block can drive the base, core pulling mechanism, ejection mechanism, and first insert block to move together, so that the chair back first detaches from the core mold. Then, drive component three drives the first pull block to demold the bending part of the armrest and chair leg. Then, drive component four drives the main pull block to slide on the base along the core pulling direction. The main pull block pulls the core of the chair leg and the connection between the armrest and chair back. While the main pull block is pulling the core, it also drives the first pull block to move further away from the plastic chair body. At this time, only the forming limit block remains in place under the action of the limiting component to support the armrest. The armrest part formed by the forming limit block does not need to be core pulled and can be directly ejected to detach from the forming limit block. Through the orderly and step-by-step actions of the main pull block, the first pull block, and the forming limit block in space, precise and interference-free demolding of the complex curved surface and bending structure of the plastic chair is achieved, ensuring the molding quality and mold operation stability.

[0010] Preferably, the driving component includes a gear and two racks. The first insert has a receiving cavity for accommodating the ejection mechanism. The bottom wall of the receiving cavity has a clearance groove for accommodating the gear and the two racks. The second insert has a rotating rod coaxially and integrally formed on it. The rotating rod is rotatably disposed in the first insert. The end of the rotating rod away from the second insert is coaxially fixedly connected to the gear by a screw. The two racks correspond to two main pull blocks respectively. One end of the rack is fixedly installed on the main pull block. The rack is slidably connected to the second insert along the core-pulling direction parallel to the main pull block. The two racks are located on both sides of the gear and mesh with the gear.

[0011] By adopting the above technical solution, when the main pulling block slides along the base during the core pulling process, the rack fixed on it moves accordingly. Since the two racks are located on both sides of the gear and mesh with it, the linear motion of the racks is converted into the rotational motion of the gear. The gear drives the second insert to rotate within the groove of the first insert through a coaxially fixed rotating rod. No additional independent rotational drive source is required; the rotation and reset of the second insert can be precisely controlled using the motion power of the core pulling mechanism itself.

[0012] Preferably, the ejection mechanism includes a first hydraulic cylinder, a top plate, a seat top member, and a cover plate top member. The first hydraulic cylinder is fixedly mounted on the base, and the piston rod of the first hydraulic cylinder extends into the receiving cavity and is fixedly connected to the top plate. The seat top member is mounted on the top plate and is used to lift the seat. The cover plate top member includes a first push rod and a first push block. One end of the first push rod is fixedly connected to the top plate, and the other end of the first push rod is rotatably connected to the first push block. The first push rod passes through and moves on the rotating rod, and the first push block is used to lift the cover plate.

[0013] By adopting the above technical solution, during the core-pulling stage after injection molding, the rotation of the second insert drives the cover plate to rotate, which in turn drives the first ejector block to rotate synchronously. The first ejector rod and the rotating rod rotate relative to each other, and the cover plate ejector does not affect the rotation of the second insert or the cover plate. During ejection, the first hydraulic cylinder is activated, pushing the ejector plate to move within the receiving cavity. The ejector plate drives the seat ejector to lift the seat off the first insert. Simultaneously, the ejector plate drives the first ejector rod to move, which passes through the rotating rod and the interior of the second insert, driving the first ejector block to lift the molded cover plate off the second insert. This simplifies the ejection structure, avoids increased mold volume and costs, ensures product quality, and improves ejection efficiency.

[0014] Preferably, the second driving component includes a fixed plate, a second hydraulic cylinder, and a fixed platform. The fixed plate is fixedly installed on the corresponding main drawing block, the fixed platform is fixedly installed on the core mold, the second hydraulic cylinder is fixedly installed on the fixed plate, and the piston rod of the second hydraulic cylinder is slidably connected to the fixed platform along the core-pulling direction parallel to the main drawing block.

[0015] By adopting the above technical solution, when the second oil cylinder is activated, the cylinder body of the second oil cylinder moves relative to the piston rod, thereby driving the fixed plate and the main drawing block to move along the mold opening and closing direction.

[0016] Preferably, the driving component three includes a third hydraulic cylinder and a driving block. The third hydraulic cylinder is fixedly mounted on the main drawing block, and the piston rod of the third hydraulic cylinder is fixedly mounted on the driving block. The driving block is slidably connected to the main drawing block along a core-pulling direction parallel to the main drawing block. The first drawing block is slidably connected to the main drawing block along the core-pulling direction, and the first drawing block and the driving block are slidably connected along an inclined direction.

[0017] By adopting the above technical solution, the first draw block is slidably connected to the main draw block along the core-pulling direction. The piston rod of the third cylinder extends, driving the drive block to move. When the drive block moves linearly, the direction of motion is converted into the tilting and sliding of the first draw block relative to the main draw block through the inclined surface cooperation, thereby retracting from the bend between the armrest and the chair leg.

[0018] Preferably, the limiting component includes a positioning post and a sliding block. The positioning post is fixedly installed on the core mold, and the sliding block is fixedly installed on the forming limiting block. The sliding block is slidably connected to the positioning post along the mold opening and closing direction. The main drawing block has a relief groove for accommodating the positioning post and the sliding block after the core is drawn.

[0019] By adopting the above technical solution, the cooperation between the positioning column and the sliding block restricts the molding limit block to move only in the mold opening and closing direction.

[0020] Preferably, the driving component four includes a fixed cover and a fourth hydraulic cylinder. The main drawing block has an installation groove on its outer side facing the fixed plate. The fixed cover is located in the installation groove and fixedly installed on the main drawing block. The fourth hydraulic cylinder is located inside the fixed cover and fixedly installed on the fixed plate. The piston rod of the fourth hydraulic cylinder is fixedly installed on the fixed cover.

[0021] By adopting the above technical solution, when the fourth cylinder actuates, the piston rod extends or retracts. Since its cylinder body is fixed, the piston rod drives the fixed cover and the main pull block, which is fixed to it, to slide along the core-pulling direction on the base. The fixed cover protects the fourth cylinder, and the fixed plate provides an installation platform for the fourth cylinder. When the main pull block moves, the clearance groove on the main pull block provides space for the positioning post and the sliding block, without affecting their positions. Simultaneously, when the main pull block moves, the piston rod of the second cylinder slides synchronously on the fixed platform, without affecting the second driving component.

[0022] The main technical effects of this invention are reflected in the following aspects: 1. This invention integrates the plastic chair body and cover, which originally required two separate molds, into a single injection mold for production. A groove is created in the first insert, and a second insert for molding the cover is rotatably positioned. A drive unit drives the second insert to rotate, breaking the connecting sprue between the cover and the plastic chair body, separating the cover and the chair body. An ejection mechanism simultaneously ejects both. This effectively reduces the number of molds required, lowers mold development costs and production space requirements, and significantly improves the production efficiency of plastic chairs and their accessories through process integration. 2. In this invention, after mold opening, during the process of the second driving component driving the main pulling block to move along the mold opening and closing direction, the main pulling block can drive the base, core pulling mechanism, ejection mechanism and the first insert to move together, so that the chair back first separates from the core mold; then the third driving component drives the first pulling block to demold the bending part of the armrest and chair leg; then the fourth driving component drives the main pulling block to slide on the base along the core pulling direction, and the main pulling block pulls the core of the chair leg and the connection between the armrest and chair back. While the main pulling block pulls the core, it also drives the first pulling block to move further away from the plastic chair body. At this time, the molding limiting block stays in place to support the armrest; through the orderly and step-by-step movements of the main pulling block, the first pulling block and the molding limiting block in space, the precise and interference-free demolding of the complex curved surface and bending structure of the plastic chair is achieved, ensuring the molding quality and the stability of the mold operation. Attached Figure Description

[0023] Figure 1 This is a structural diagram showing the assembly of the plastic chair body with the toilet bowl, toilet seat, and toilet seat cover.

[0024] Figure 2 It is along Figure 1 A cross-sectional view along line AA in the middle.

[0025] Figure 3 yes Figure 2 Enlarged view of point B in the middle.

[0026] Figure 4 This is a schematic diagram of the structure of the plastic chair injection mold in this embodiment.

[0027] Figure 5 This is a schematic diagram of the core mold part after the plastic chair injection mold is opened in this embodiment.

[0028] Figure 6 This is a schematic diagram of the structure of the second driver component after it is running in this embodiment.

[0029] Figure 7 This is a schematic diagram of the fit between the core mold and the guide rod in this embodiment.

[0030] Figure 8 This is a schematic diagram of the structure of driver component three and driver component four after they are in operation in this embodiment.

[0031] Figure 9 This is a partial structural diagram of the clearance groove and the driving component four in this embodiment.

[0032] Figure 10 This is a schematic diagram of the structure within the first insert in this embodiment.

[0033] Figure 11 This is a schematic diagram of the ejection mechanism and the main extraction block in this embodiment.

[0034] Figure 12 It is along Figure 9 A cross-sectional view of the CC line.

[0035] Figure 13 yes Figure 12 Enlarged view of point D in the middle.

[0036] Explanation of reference numerals in the attached drawings: 1. Plastic chair body; 11. Chair back; 12. Chair seat; 13. Armrest; 14. Chair leg; 15. Cover plate; 16. Toilet bowl; 17. Protrusion; 18. Concave groove; 19. Reinforcing frame; 2. Core mold; 21. First insert; 211. Groove; 212. Receiving cavity; 213. Clearance groove; 22. Guide rod; 23. Base; 3. Cavity mold; 41. Drive component one; 411. Gear; 412. Rack; 42. Second insert; 421. Rotating rod; 422. Sprue; 5. Ejector. Structure; 51. First hydraulic cylinder; 52. Top plate; 53. First ejector rod; 54. First ejector block; 55. Second ejector rod; 56. Second ejector block; 57. Slide seat; 58. Ejector pin; 6. Core pulling mechanism; 61. Main pulling block; 611. Mounting groove; 62. Fixing plate; 63. Second hydraulic cylinder; 64. Fixing platform; 65. First pulling block; 66. Third hydraulic cylinder; 67. Drive block; 681. Forming limit block; 682. Positioning post; 683. Sliding block; 684. Relief groove; 69. Fixing cover; 691. Fourth hydraulic cylinder. Detailed Implementation

[0037] The following is in conjunction with the appendix Figures 4-13 This application will be described in further detail to make the technical solution of this application easier to understand and master.

[0038] This application discloses a plastic chair injection mold with a multi-slider demolding mechanism.

[0039] Reference Figures 4-7This embodiment of a plastic chair injection mold with a multi-slider demolding mechanism includes a core mold 2, a cavity mold 3, an ejection mechanism 5 and two core-pulling mechanisms 6 disposed on the core mold 2. After the core mold 2 and the cavity mold 3 are closed, a molding cavity is formed. A first insert 21 for molding a chair seat 12 is slidably installed inside the core mold 2 along the opening and closing direction. Two guide rods 22 are fixed inside the core mold 2, and the two guide rods 22 slide through the first insert 21, thereby limiting the sliding direction of the first insert 21. A base 23 is fixedly installed on the first insert 21, and two core-pulling mechanisms 6 are disposed on the base 23 and located on both sides of the first insert 21, respectively, for demolding the two armrests 13 and the corresponding chair legs 14.

[0040] Reference Figure 8-10 It also includes a drive component 41 and a second insert 42. The second insert 42 is used to form the cover plate 15. The first insert 21 has a groove 211. The second insert 42 is rotatably disposed in the groove 211. The drive component 41 is used to drive the second insert 42 to rotate along the axis. Several sprues 422 are sequentially formed on the second insert 42 along the circumferential direction. The two ends of the sprues 422 are respectively connected to the forming cavities of the cover plate 15 and the seat 12. The ejection mechanism 5 is disposed on the base 23 and is used to eject the plastic chair body 1 and the cover plate 15.

[0041] Reference Figures 4-10 The process integrates the plastic chair body 1 and cover plate 15, which originally required two separate molds, into a single injection mold for production. A groove 211 is formed on the first insert 21, and a second insert 42 for molding the cover plate 15 is rotatably mounted. A drive component 41 drives the second insert 42 to rotate, breaking the connecting sprue between the cover plate 15 and the plastic chair body 1, separating the cover plate 15 and the plastic chair body 1. The ejection mechanism 5 then ejects both simultaneously. This effectively reduces the number of molds required, lowers mold opening costs and production space requirements, and significantly improves the production efficiency of the plastic chair and its accessories through process integration.

[0042] Reference Figures 5-8The core-pulling mechanism 6 includes a second driving component, a third driving component, a fourth driving component, a main pulling block 61, a first pulling block 65, a forming limiting block 681, and a limiting component. The main pulling block 61 is slidably connected to the base 23 along the core-pulling direction. The main pulling block 61 is used to form the chair legs 14 and the connection between the armrests 13 and the backrest 11. The second driving component is disposed on the main pulling block 61 and the core mold 2, and is used to drive the main pulling block 61 to move along the mold opening and closing direction. The third driving component is disposed on the main pulling block 61, and is used to drive the first pulling block 65 to slide along the core-pulling direction. The first pulling block 65 is used to form the bend between the armrests 13 and the chair legs 14. The forming limiting block 681 is slidably connected to the main pulling block 61 along a sliding direction parallel to the sliding direction of the main pulling block 61 on the base 23. The forming limiting block 681 is used to form the main body of the armrests 13. The limiting component is used to restrict the main pulling block 61 to slide only along the mold opening and closing direction. The fourth driving component is used to drive the main pulling block 61 to slide on the base 23 along the core-pulling direction.

[0043] Reference Figures 5-8 After the mold is opened, the second driving component drives the main pull block 61 to move along the mold opening and closing direction. The main pull block 61 can drive the base 23, the core pulling mechanism 6, the ejection mechanism 5 and the first insert 21 to move together, so that the chair back 11 is first separated from the core mold 2. Then the third driving component drives the first pull block 65 to demold the bending part of the armrest 13 and the chair leg 14. Then the fourth driving component drives the main pull block 61 to slide on the base 23 along the core pulling direction. The main pull block 61 pulls the core of the chair leg 14 and the connection between the armrest 13 and the chair back 11. While the main pull block 61 pulls the core, it will also drive the first pull block 65 to move further away from the plastic chair body 1. At this time, only the molding limit block 681 continues to stay in place under the action of the limit component to support the armrest 13. The armrest 13 part formed by the molding limit block 681 does not need to be pulled and can be directly ejected to separate from the molding limit block 681. Through the orderly and step-by-step movements of the main extraction block 61, the first extraction block 65, and the forming limiting block 681 in space, precise and interference-free demolding of the complex curved surfaces and bending structures of the plastic chair is achieved, ensuring the molding quality and the stability of the mold operation.

[0044] Reference Figures 9-13 The drive component 41 includes a gear 411 and two racks 412. The first insert 21 has a receiving cavity 212 for accommodating the ejection mechanism 5. The bottom wall of the receiving cavity 212 is provided with a clearance groove 213 for accommodating the gear 411 and the two racks 412. The second insert 42 has a rotating rod 421 coaxially and integrally formed on it. The rotating rod 421 is rotatably disposed in the first insert 21. The end of the rotating rod 421 away from the second insert 42 is fixedly connected to the gear 411 coaxially by a screw. The two racks 412 correspond to the two main pull blocks 61 respectively. One end of the rack 412 is fixedly installed on the main pull block 61 by a screw. The rack 412 is slidably connected to the second insert 42 along the core-pulling direction parallel to the main pull block 61. The two racks 412 are located on both sides of the gear 411 and mesh with the gear 411.

[0045] Reference Figures 9-13 When the main pull block 61 slides along the base 23 during the core-pulling process, the rack 412 fixed on it moves accordingly. Since the two racks 412 are located on both sides of the gear 411 and mesh with it, the linear motion of the racks 412 is converted into the rotational motion of the gear 411. The gear 411 drives the second insert 42 to rotate within the groove 211 of the first insert 21 through the coaxially fixed rotating rod 421. Without the need for an additional independent rotational drive source, the rotation and reset of the second insert 42 can be precisely controlled by utilizing the motion power of the core-pulling mechanism 6 itself.

[0046] Reference Figures 10-12 The ejection mechanism 5 includes a first hydraulic cylinder 51, a top plate 52, a seat 12 ejector, and a cover plate 15 ejector. The first hydraulic cylinder 51 is fixedly mounted on the base 23. The piston rod of the first hydraulic cylinder 51 extends into the receiving cavity 212 and is fixedly connected to the top plate 52. The seat 12 ejector is mounted on the top plate 52 and is used to lift the seat 12. The cover plate 15 ejector includes a first ejector rod 53 and a first ejector block 54. One end of the first ejector rod 53 is fixedly connected to the top plate 52, and the other end of the first ejector rod 53 is rotatably connected to the first ejector block 54. The first ejector rod 53 passes through and moves on the rotating rod 421. The first ejector block 54 is used to lift the cover plate 15.

[0047] Reference Figures 10-12 During the core-pulling stage after injection molding, the rotation of the second insert 42 drives the cover plate 15 to rotate, which in turn drives the first ejector block 54 to rotate synchronously. The first ejector rod 53 and the rotating rod 421 rotate relative to each other. The ejector of the cover plate 15 does not affect the rotation of the second insert 42 or the cover plate 15 itself. During ejection, the first hydraulic cylinder 51 is activated, pushing the ejector plate 52 to move within the receiving cavity 212. The ejector plate 52 drives the ejector of the seat 12 to lift the seat 12 off the first insert 21. At the same time, the ejector plate 52 drives the first ejector rod 53 to move. The first ejector rod 53 passes through the rotating rod 421 and the interior of the second insert 42, driving the first ejector block 54 to lift the molded cover plate 15 off the second insert 42. This simplifies the ejection structure, avoids increased mold volume and costs, ensures product quality, and improves ejection efficiency.

[0048] Reference Figures 10-12The chair seat 12 top component includes a second ejector rod 55, a second ejector block 56, a slide block 57, and several ejector pins 58. One end of the ejector pin 58 is fixedly mounted on the top plate 52, and the other end of the ejector pin 58 is slidably disposed in the first insert 21 for lifting the chair seat 12. The slide block 57 is slidably connected to the top plate 52. One end of the second ejector rod 55 is fixedly mounted on the slide block 57, and the other end of the second ejector rod 55 passes through the first insert 21 in an inclined direction and is then fixedly connected to the second ejector block 56. The second ejector block 56 ejects the chair seat 12 over a large area, while the ejector pins 58 assist in ejecting the remaining local structures of the chair seat 12, ensuring that the chair seat 12 is demolded smoothly as a whole.

[0049] Reference Figures 7-12 The guide rod 22 is positioned to avoid all structures in the drive unit 41 and the ejection mechanism 5.

[0050] Reference Figures 5-8 The second driving component includes a fixed plate 62, a second hydraulic cylinder 63, and a fixed platform 64. The fixed plate 62 is fixedly installed on the corresponding main pulling block 61, the fixed platform 64 is fixedly installed on the core mold 2, and the second hydraulic cylinder 63 is fixedly installed on the fixed plate 62. The piston rod of the second hydraulic cylinder 63 is slidably connected to the fixed platform 64 along the core pulling direction parallel to the main pulling block 61.

[0051] Reference Figures 5-8 When the second hydraulic cylinder 63 is activated, the cylinder body of the second hydraulic cylinder 63 moves relative to the piston rod, thereby driving the fixed plate 62 and the main drawing block 61 to move along the mold opening and closing direction.

[0052] Reference Figures 5-8 The driving component three includes a third hydraulic cylinder 66 and a driving block 67. The third hydraulic cylinder 66 is fixedly mounted on the main drawing block 61, and the piston rod of the third hydraulic cylinder 66 is fixedly mounted on the driving block 67. The driving block 67 is slidably connected to the main drawing block 61 along the core-pulling direction parallel to the main drawing block 61. The first drawing block 65 is slidably connected to the main drawing block 61 along the core-pulling direction, and the first drawing block 65 and the driving block 67 are slidably connected along the inclined direction.

[0053] Reference Figures 5-8 The first drawer block 65 is slidably connected to the main drawer block 61 along the core-pulling direction. The piston rod of the third cylinder 66 extends, driving the drive block 67 to move. When the drive block 67 moves linearly, the direction of motion is converted into the tilting and sliding of the first drawer block 65 relative to the main drawer block 61 through the inclined surface cooperation, thereby exiting the bend between the armrest 13 and the chair leg 14.

[0054] Reference Figures 5-8The limiting components include a positioning post 682 and a sliding block 683. The positioning post 682 is fixedly installed on the core mold 2, and the sliding block 683 is fixedly installed on the forming limiting block 681. The sliding block 683 is slidably connected to the positioning post 682 along the mold opening and closing direction. The main drawing block 61 has a relief groove 684 for accommodating the positioning post 682 and the sliding block 683 after the core is drawn.

[0055] Reference Figures 5-8 The cooperation between the positioning pin 682 and the sliding block 683 restricts the molding limit block 681 to move only in the mold opening and closing direction.

[0056] Reference Figures 5-12 The driving component four includes a fixed cover 69 and a fourth hydraulic cylinder 691. The main pull block 61 has a mounting groove 611 on the outer side of the fixed plate 62. The fixed cover 69 is located in the mounting groove 611 and is fixedly installed on the main pull block 61. The fourth hydraulic cylinder 691 is located in the fixed cover 69 and is fixedly installed on the fixed plate 62. The piston rod of the fourth hydraulic cylinder 691 is fixedly installed on the fixed cover 69.

[0057] Reference Figures 5-12 When the fourth cylinder 691 is activated, the piston rod extends or retracts. Since its cylinder body is fixed, the piston rod drives the fixed cover 69 and the main pull block 61, which is fixed to it, to slide along the core-pulling direction on the base 23. The fixed cover 69 protects the fourth cylinder 691, and the fixed plate 62 provides an installation platform for the fourth cylinder 691. When the main pull block 61 moves, the clearance groove 684 on the main pull block 61 provides space for the positioning post 682 and the sliding block 683, without affecting their positions. Simultaneously, when the main pull block 61 moves, the piston rod of the second cylinder 63 slides synchronously on the fixed platform 64, without affecting the second driving component.

[0058] Of course, the above are just typical examples of this application. In addition, this application may have many other specific implementation methods. All technical solutions formed by equivalent substitution or equivalent transformation fall within the scope of protection claimed in this application.

Claims

1. A plastic chair injection mold with a multi-slider demolding mechanism, characterized in that: The mold includes a core mold (2), a cavity mold (3), an ejection mechanism (5) and two core-pulling mechanisms (6) disposed on the core mold (2). A first insert (21) for molding a chair seat (12) is slidably installed in the core mold (2) along the opening and closing direction. A base (23) is fixedly installed on the first insert (21). The two core-pulling mechanisms (6) are disposed on the base (23) and are located on both sides of the first insert (21) respectively, for demolding the two armrests (13) and the corresponding side chair legs (14). It also includes a drive component (41) and a second insert (42). The second insert (42) is used to form the cover plate (15). The first insert (21) has a groove (211). The second insert (42) is rotatably disposed in the groove (211). The drive component (41) is used to drive the second insert (42) to rotate along the axis. The second insert (42) has several sprues (422) sequentially formed along the circumference. The two ends of the sprues (422) are respectively connected to the molding cavity where the cover plate (15) and the chair seat (12) are located. The ejection mechanism (5) is disposed on the base (23) and is used to eject the plastic chair body (1) and the cover plate (15).

2. The injection mold for a plastic chair with a multi-slider demolding mechanism according to claim 1, characterized in that: The core-pulling mechanism (6) includes a second driving component, a third driving component, a fourth driving component, a main pulling block (61), a first pulling block (65), a forming limiting block (681), and a limiting component. The main pulling block (61) is slidably connected to the base (23) along the core-pulling direction. The main pulling block (61) is used to form the chair legs (14) and the connection between the armrests (13) and the backrest (11). The second driving component is set on the main pulling block (61) and the core mold (2) and is used to drive the main pulling block (61) to move along the mold opening and closing direction. The third driving component is set on the main pulling block (61) and is used to... The first draw block (65) is slidable along the core-pulling direction. The first draw block (65) is used to form the bend between the armrest (13) and the chair leg (14). The forming limiting block (681) is slidably connected to the main draw block (61) along the sliding direction parallel to the main draw block (61) on the base (23). The forming limiting block (681) is used to form the main body of the armrest (13). The limiting member is used to restrict the main draw block (61) to slide only along the mold opening and closing direction. The driving member is used to drive the main draw block (61) to slide on the base (23) along the core-pulling direction.

3. A plastic chair injection mold with a multi-slider demolding mechanism according to claim 2, characterized in that: The driving component (41) includes a gear (411) and two racks (412). The first insert (21) has a receiving cavity (212) for accommodating the ejection mechanism (5). The bottom wall of the receiving cavity (212) is provided with a clearance groove (213) for accommodating the gear (411) and the two racks (412). The second insert (42) has a rotating rod (421) coaxially and integrally formed on it. The rotating rod (421) is rotatably disposed in the first insert (21). (421) The end away from the second insert (42) is fixedly connected to the gear (411) coaxially by a screw. The two racks (412) correspond to the two main pull blocks (61) respectively. One end of the rack (412) is fixedly installed on the main pull block (61). The rack (412) is slidably connected to the second insert (42) along the core-pulling direction parallel to the main pull block (61). The two racks (412) are located on both sides of the gear (411) and mesh with the gear (411).

4. A plastic chair injection mold with a multi-slider demolding mechanism according to claim 3, characterized in that: The ejection mechanism (5) includes a first hydraulic cylinder (51), a top plate (52), a seat (12) top member, and a cover plate (15) top member. The first hydraulic cylinder (51) is fixedly mounted on the base (23). The piston rod of the first hydraulic cylinder (51) extends into the receiving cavity (212) and is fixedly connected to the top plate (52). The seat (12) top member is mounted on the top plate (52) and is used to lift the seat (12). The cover plate (15) top member includes a first top rod (53) and a first top block (54). One end of the first top rod (53) is fixedly connected to the top plate (52), and the other end of the first top rod (53) is rotatably connected to the first top block (54). The first top rod (53) passes through and moves on the rotating rod (421). The first top block (54) is used to lift the cover plate (15).

5. A plastic chair injection mold with a multi-slider demolding mechanism according to claim 2, characterized in that: The second driving component includes a fixed plate (62), a second hydraulic cylinder (63), and a fixed platform (64). The fixed plate (62) is fixedly installed on the corresponding main drawing block (61), and the fixed platform (64) is fixedly installed on the core mold (2). The second hydraulic cylinder (63) is fixedly installed on the fixed plate (62), and the piston rod of the second hydraulic cylinder (63) is slidably connected to the fixed platform (64) along the core-pulling direction parallel to the main drawing block (61).

6. A plastic chair injection mold with a multi-slider demolding mechanism according to claim 2, characterized in that: The driving component three includes a third hydraulic cylinder (66) and a driving block (67). The third hydraulic cylinder (66) is fixedly mounted on the main drawing block (61), and the piston rod of the third hydraulic cylinder (66) is fixedly mounted on the driving block (67). The driving block (67) is slidably connected to the main drawing block (61) along the core-pulling direction parallel to the main drawing block (61). The first drawing block (65) is slidably connected to the main drawing block (61) along the core-pulling direction. The first drawing block (65) and the driving block (67) are slidably connected in an inclined direction.

7. A plastic chair injection mold with a multi-slider demolding mechanism according to claim 2, characterized in that: The limiting components include a positioning post (682) and a sliding block (683). The positioning post (682) is fixedly installed on the core mold (2), and the sliding block (683) is fixedly installed on the forming limiting block (681). The sliding block (683) is slidably connected to the positioning post (682) along the mold opening and closing direction. The main pull block (61) has a relief groove (684) for accommodating the positioning post (682) and the sliding block (683) after the core is pulled.

8. A plastic chair injection mold with a multi-slider demolding mechanism according to claim 5, characterized in that: The driving component four includes a fixed cover (69) and a fourth hydraulic cylinder (691). The main draw block (61) has an installation groove (611) on the outer side of the fixed plate (62). The fixed cover (69) is located in the installation groove (611) and fixedly installed on the main draw block (61). The fourth hydraulic cylinder (691) is located in the fixed cover (69) and fixedly installed on the fixed plate (62). The piston rod of the fourth hydraulic cylinder (691) is fixedly installed on the fixed cover (69).

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