An injection mold for a seat armrest cover

Abstract

This invention provides an injection mold for a seat armrest cover, belonging to the field of injection mold technology. The injection mold for this seat armrest cover includes a top plate, an upper mold plate, a core, a lower mold plate, side plates, and a bottom plate. The core is fixed on the lower mold plate, and an arc-shaped molding cavity is formed on the upper surface of the core. The lower mold plate has a through-hole for core pulling, and a slide block is fixed inside the core pulling hole. An arc-shaped track is provided on the side of the slide block, and an arc-shaped slider that slides along the arc-shaped track is provided on the slide block. An inner core rod that can extend into the molding cavity is fixed at the upper end of the arc-shaped slider. A power assembly for driving the arc-shaped slider to slide along the arc-shaped track is provided between the side plates and the bottom plate. The motor drives the gear and the arc-shaped rack for transmission. The arc-shaped slider cooperates with the arc-shaped track, and the core pulling trajectory is adapted to the height of the arc-shaped inner cavity of the seat armrest cover, avoiding product scratches and deformation caused by straight core pulling, and ensuring smooth and stable core pulling action.

Description

Technical Field

[0001] This invention belongs to the field of injection mold technology, and relates to an injection mold for a seat armrest cover. Background Technology

[0002] Seat armrest covers are mostly plastic components with curved inner cavities. Traditional injection molds for curved inner cavities often use linear core pulling or multi-link transmission structures for core pulling mechanisms. These have problems such as poor adaptability between the core pulling trajectory and the curved inner cavity of the product, insufficient slider positioning accuracy, easy displacement of the slider during mold closing and injection, and easy scratching of the inner wall of the product during demolding. This results in large dimensional deviations, many appearance defects, and low yield of seat armrest covers. At the same time, the traditional mold core pulling transmission structure is complex, has high maintenance costs, and insufficient operational stability, making it difficult to meet the mass production needs of high-precision curved armrest covers.

[0003] Therefore, developing an injection mold for a seat armrest cover that adapts to the curved inner cavity, allows for smooth core pulling, and provides reliable positioning has significant engineering application value. Summary of the Invention

[0004] The purpose of this invention is to solve the problems of poor arc-shaped core pulling and low positioning accuracy in existing injection molds for seat armrest covers. This invention provides an injection mold for seat armrest covers that uses an arc-shaped slider and an arc-shaped track to achieve precise arc-shaped core pulling. With the addition of a double locking structure, it significantly improves the product molding accuracy and production stability.

[0005] The objective of this invention can be achieved through the following technical solution: An injection mold for a seat armrest cover includes a top plate, an upper template, a core, a lower template, side plates, and a bottom plate. The top plate is fixedly connected to the upper template, the two side plates are fixed to the lower end of the lower template, and the bottom plate is fixed to the lower end of the side plates. The core is fixed on the lower template, and an arc-shaped molding cavity is opened on the upper end face of the core. The lower template has a core-pulling hole that runs vertically through it. A slide block is fixed inside the core-pulling hole, and an arc-shaped track is provided on the side of the slide block. An arc-shaped slider that slides along the arc-shaped track is provided on the slide block, and an inner core rod that can extend into the molding cavity is fixed at the upper end of the arc-shaped slider. A power component for driving the arc-shaped slider to slide along the arc-shaped track is provided between the side plate and the bottom plate.

[0006] Furthermore, the power assembly includes a motor, a main shaft, a driven shaft, and a bearing seat; the motor is fixed on the outside of the side plate, the bearing seat is fixed on the base plate, and both the main shaft and the driven shaft are rotatably connected between the bearing seat and the side plate; the motor output shaft is connected to the main shaft, and the main shaft and the driven shaft are linked through a gear set; a drive gear is fixed on the driven shaft, and the arc-shaped slider is provided with an arc-shaped rack that meshes with the drive gear.

[0007] Furthermore, a limit block is provided at the lower end of the arc-shaped track to prevent the arc-shaped slider from sliding down excessively; when the arc-shaped slider slides to the uppermost end, it abuts against one end of the mold core to achieve mold closing and positioning.

[0008] Furthermore, the arc-shaped slider has a locking groove, and the side plate has a horizontal sliding groove with a sliding locking block inside the horizontal sliding groove; a concave cylinder mounting seat is fixed on the outside of the side plate, and a locking cylinder is fixed on the cylinder mounting seat, with the front end of the locking cylinder connected to the locking block; when the arc-shaped slider slides to the top, the locking block can be inserted into the locking groove to achieve initial locking.

[0009] Furthermore, a long strip-shaped retaining strip is fixed to the outside of the upper mold plate; in the mold closing state, the retaining strip is inserted between the cylinder mounting seat and the locking block, with the front side of the retaining strip abutting against the locking block and the rear side abutting against the cylinder mounting seat to prevent the locking block from loosening and to ensure the stability of the arc-shaped slider and the inner core rod during the injection molding process.

[0010] Furthermore, a core-pulling cylinder is fixed on the lower template, and a linear slide groove is opened on the lower template. A linear slider is provided in the linear slide groove. A forming core block is fixed at the front end of the linear slider and connected to the piston rod of the core-pulling cylinder at the rear end. The core-pulling cylinder can push the forming core block into the forming cavity and abut against the inner core rod.

[0011] Furthermore, the front end of the molded core block is provided with a protruding retaining plate, and the front end of the inner core rod is provided with a slot for the retaining plate to be inserted, thereby improving the molding fit accuracy.

[0012] Furthermore, a material ejection assembly is provided between the two side plates; the material ejection assembly includes a lifting plate, a mounting plate, an ejector rod, a lifting rod, and a support column; the support column is vertically fixed on the base plate, and the lifting plate can abut against the support column after it is lowered; the lifting rod passes through the base plate and is connected to the lifting plate, and the lifting plate is fixed to the mounting plate by bolts; the lower end of the ejector rod is fixed on the mounting plate, and the upper end passes through the lower template and the mold core in sequence and contacts the forming cavity.

[0013] Furthermore, the top plate is equipped with an injection interface, and the upper template has an injection channel that connects the injection interface and the molding cavity.

[0014] Compared with existing technologies, the injection mold for this seat armrest cover has the following advantages: 1. The motor drives the gear and the arc rack for transmission, the core pulling stroke is controllable, the arc slider and the arc track cooperate, the core pulling trajectory is adapted to the height of the arc inner cavity of the seat armrest cover, avoiding product scratches and deformation caused by straight core pulling, and the core pulling action is smooth and stable.

[0015] 2. The locking block and the retaining strip form a double lock, ensuring that the slider does not shift or loosen during mold closing and injection molding, significantly improving the dimensional accuracy and consistency of the product.

[0016] 3. The molded core block and the inner core rod are connected by a snap-fit ​​mechanism, and the molded surfaces fit tightly, effectively reducing defects such as flash and missing material. Attached Figure Description

[0017] Figure 1This is a schematic diagram of the overall structure of the injection mold for the armrest cover of this chair.

[0018] Figure 2 This is a schematic diagram of the upper mold structure.

[0019] Figure 3 This is a schematic diagram of the lower mold structure.

[0020] Figure 4 This is a sectional view of the lower mold.

[0021] Figure 5 This is a structural schematic diagram of the power assembly.

[0022] Figure 6 This is a schematic diagram of the inner core rod.

[0023] Figure 7 This is a schematic diagram of the molded core block.

[0024] In the diagram, 1. Top plate; 11. Injection interface; 2. Upper mold plate; 21. Clamping strip; 3. Mold core; 31. Molding cavity; 4. Lower mold plate; 41. Core pulling hole; 42. Core pulling cylinder; 43. Linear slide; 44. Linear slider; 45. Molding core block; 46. Clamping plate; 5. Side plate; 51. Horizontal slide; 52. Locking block; 53. Cylinder mounting seat; 54. Locking cylinder; 6. Base plate; 7. Slide seat; 7 1. Arc-shaped track; 72. Arc-shaped slider; 73. Inner core rod; 74. Limit block; 75. Locking groove; 76. Slot; 8. Power assembly; 81. Motor; 82. Main shaft; 83. Driven shaft; 84. Shaft seat; 85. Gear set; 86. Drive gear; 87. Arc-shaped rack; 9. Unloading assembly; 91. Lifting plate; 92. Mounting plate; 93. Ejector rod; 94. Lifting rod; 95. Support column. Detailed Implementation

[0025] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings to further illustrate the technical solutions of the present invention. However, the present invention is not limited to these embodiments.

[0026] like Figure 1 , Figure 2 , Figure 3As shown, the injection mold for the armrest cover of this seat includes a top plate 1, an upper template 2, a core 3, a lower template 4, side plates 5, and a bottom plate 6. The top plate 1 is fixedly connected to the upper template 2, the two side plates 5 are fixed to the lower end of the lower template 4, and the bottom plate 6 is fixed to the lower end of the side plates 5. The core 3 is fixed on the lower template 4, and the upper end face of the core 3 has an arc-shaped molding cavity 31. The lower template 4 has a core-pulling hole 41 that runs vertically through it. A slide block 7 is fixed inside the core-pulling hole 41. An arc-shaped track 71 is provided on the side of the slide block 7. An arc-shaped slider 72 that slides along the arc-shaped track 71 is provided on the slide block 7. An inner core rod 73 that can extend into the molding cavity 31 is fixed at the upper end of the arc-shaped slider 72. A power assembly 8 for driving the arc-shaped slider 72 to slide along the arc-shaped track 71 is provided between the side plate 5 and the bottom plate 6.

[0027] like Figure 4 , Figure 5 As shown, the power assembly 8 includes a motor 81, a main shaft 82, a driven shaft 83, and a bearing 84. The motor 81 is fixed to the outside of the side plate 5, and the bearing 84 is fixed to the base plate 6. Both the main shaft 82 and the driven shaft 83 are rotatably connected between the bearing 84 and the side plate 5. The output shaft of the motor 81 is connected to the main shaft 82, and the main shaft 82 and the driven shaft 83 are linked by a gear set 85. A drive gear 86 is fixed on the driven shaft 83, and the arc-shaped slider 72 is provided with an arc-shaped rack 87 that meshes with the drive gear 86. When the motor 81 is started, it drives the main shaft 82 to rotate. The main shaft 82 drives the driven shaft 83 to rotate through the gear set 85. The drive gear 86 on the driven shaft 83 drives the arc-shaped slider 72 to slide along the arc-shaped track 71 through the arc-shaped rack 87, thus performing the actions of core pulling or sealing the molding cavity 31.

[0028] The lower end of the arc-shaped track 71 is provided with a limiting block 74 to prevent the arc-shaped slider 72 from sliding down excessively. When the arc-shaped slider 72 slides to the uppermost position, it abuts against one end of the mold core 3 to achieve mold closing and positioning. Furthermore, the arc-shaped slider 72 has a locking groove 75, and the side plate 5 has a horizontal slide groove 51. A sliding locking block 52 is provided in the horizontal slide groove 51. A concave cylinder mounting seat 53 is fixed on the outside of the side plate 5, and a locking cylinder 54 is fixed on the cylinder mounting seat 53. The front end of the locking cylinder 54 is connected to the locking block 52. When the arc-shaped slider 72 slides to the uppermost position, the locking block 52 can be inserted into the locking groove 75 to achieve initial locking.

[0029] A long strip-shaped retaining strip 21 is fixed on the outside of the upper template 2. When the mold is closed, the retaining strip 21 is inserted between the cylinder mounting seat 53 and the locking block 52. The front side of the retaining strip 21 is close to the locking block 52 and the rear side is close to the cylinder mounting seat 53 to prevent the locking block 52 from loosening and to ensure the stability of the arc-shaped slider 72 and the inner core rod 73 during the injection molding process.

[0030] like Figure 5 , Figure 6 , Figure 7As shown, a core-pulling cylinder 42 is fixed on the lower template 4, and a linear slide groove 43 is opened on the lower template 4. A linear slider 44 is provided in the linear slide groove 43. A forming core block 45 is fixed at the front end of the linear slider 44, and the rear end is connected to the piston rod of the core-pulling cylinder 42. The core-pulling cylinder 42 can push the forming core block 45 into the forming cavity 31 and abut against the inner core rod 73. A protruding retaining plate 46 is provided at the front end of the forming core block 45, and a retaining groove 76 for the retaining plate 46 to be inserted is opened at the front end of the inner core rod 73, which improves the forming fit accuracy.

[0031] like Figure 4 As shown, a material ejection assembly 9 is provided between the two side plates 5. The material ejection assembly 9 includes a lifting plate 91, a mounting plate 92, an ejector rod 93, a lifting rod 94, and a support column 95. The support column 95 is vertically fixed on the base plate 6, and the lifting plate 91 can abut against the support column 95 after it descends. The lifting rod 94 passes through the base plate 6 and is connected to the lifting plate 91. The lifting plate 91 and the mounting plate 92 are fixed with bolts. The lower end of the ejector rod 93 is fixed on the mounting plate 92, and the upper end passes through the lower template 4 and the mold core 3 in sequence and contacts the forming cavity 31. The material ejection cylinder lifts the lifting rod 94, and the lifting rod 94 drives the lifting plate 91 and the mounting plate 92 to rise together. The ejector rod 93 rises accordingly and lifts the seat armrest cover in the forming cavity 31, separating it from the mold.

[0032] The top plate 1 is provided with an injection port 11, and the upper template 2 has an injection channel that connects the injection port 11 and the molding cavity 31. The screw extruder feeds molten plastic from the injection port 11 into the injection channel, and after passing through the injection channel, it finally fills the molding cavity 31.

[0033] Workflow: First, the power unit 8 drives the arc-shaped slider 72 to move upward to the molding position, causing the inner core rod 73 to insert into the molding cavity 31. The locking cylinder 54 pushes the locking block 52 into the locking groove 75, while the core-pulling cylinder 42 pushes the molding core block 45 to engage with the inner core rod 73. Then, the upper mold plate 2 moves downward and closes with the lower mold plate 4, and the locking strip 21 completes a secondary locking simultaneously. During injection molding, molten plastic is injected into the molding cavity 31 through the injection interface 11 and injection channel, and held under pressure and cooled until the product solidifies. When opening the mold, the upper mold plate 2 moves upward first, and the locking strip 21 rises to unlock the locking block 52. Then, the locking cylinder 54 drives the locking block 52 to move backward to unlock the arc-shaped slider 72, at which point the arc-shaped slider 72 is in a movable state. The motor 81 is started, driving the arc-shaped slider 72 to slide down along the arc-shaped track 71, and the inner core rod 73 completes arc-shaped core pulling. The core-pulling cylinder 42 drives the molding core block 45 to move backward to complete linear core pulling. When unloading material, the unloading cylinder is activated. The lifting rod 94 of the unloading assembly 9 drives the lifting plate 91, the mounting plate 92 and the ejection rod 93 to move upward, ejecting the product from the molding cavity 31 and completing one molding cycle.

[0034] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A injection mold for a seat arm cover, comprising a top plate (1), an upper mold plate (2), a mold core (3), a lower mold plate (4), side plates (5) and a bottom plate (6), the top plate (1) is fixed with the upper mold plate (2), two side plates (5) are fixed at the lower end of the lower mold plate (4), the bottom plate (6) is fixed at the lower end of the side plates (5), characterized in that, The mold core (3) is fixed on the lower template (4). The mold core (3) has an arc-shaped molding cavity (31). The lower template (4) has a through-hole (41). A slide block (7) is fixed inside the core-pulling hole (41). An arc-shaped track (71) is provided on the side of the slide block (7). An arc-shaped slider (72) is provided on the slide block (7) and slides along the arc-shaped track (71). An inner core rod (73) that can extend into the molding cavity (31) is fixed at the upper end of the arc-shaped slider (72). A power assembly (8) for driving the arc-shaped slider (72) to slide along the arc-shaped track (71) is provided between the side plate (5) and the bottom plate (6). A locking mechanism is provided on the arc-shaped slider (72). The side plate (5) has a horizontal sliding groove (51) on the groove (75). The horizontal sliding groove (51) is provided with a locking block (52) that slides along the horizontal sliding groove (51). A concave cylinder mounting seat (53) is fixed on the outside of the side plate (5). A locking cylinder (54) is fixed on the cylinder mounting seat (53). The front end of the locking cylinder (54) is connected to the locking block (52). When the arc-shaped slider (72) slides to the uppermost end, the locking block (52) can be inserted into the locking groove (75). A long strip of clip (21) is fixed on the outside of the upper template (2). When the mold is closed, the clip (21) is inserted between the cylinder mounting seat (53) and the locking block (52).

2. The injection mold for a seat armrest cover according to claim 1, characterized in that, The power assembly (8) includes a motor (81), a main shaft (82), a driven shaft (83), and a bearing seat (84). The motor (81) is fixed on the outside of the side plate (5), and the bearing seat (84) is fixed on the base plate (6). The main shaft (82) and the driven shaft (83) are rotatably connected between the bearing seat (84) and the side plate (5). The output shaft of the motor (81) is connected to the main shaft (82). The main shaft (82) and the driven shaft (83) are linked by a gear set (85). A drive gear (86) is also fixed on the driven shaft (83). The arc-shaped slider (72) has an arc-shaped rack (87) that meshes with the drive gear (86).

3. The injection mold for a seat armrest cover according to claim 1, characterized in that, The lower end of the arc track (71) has a limiting block (74) to prevent the arc slider (72) from continuing to slide down. After the arc slider (72) slides to the top, it abuts against one end of the mold core (3).

4. The injection mold for a seat armrest cover according to claim 1, characterized in that, A core-pulling cylinder (42) is fixed on the lower template (4). A linear slide groove (43) is opened on the lower template (4). A linear slider (44) is provided in the linear slide groove (43). A forming core block (45) is fixed at the front end of the linear slider (44). The rear end of the linear slider (44) is connected to the piston rod of the core-pulling cylinder (42). The core-pulling cylinder (42) can push the forming core block (45) into the forming cavity (31) and abut against the inner core rod (73).

5. The injection mold for a seat armrest cover according to claim 4, characterized in that, The front end of the molded core block (45) has a protruding card plate (46), and the front end of the inner core rod (73) has a slot (76) for the card plate (46) to be inserted.

6. The injection mold for a seat armrest cover according to claim 1, characterized in that, A material ejection assembly (9) is provided between the two side plates (5). The material ejection assembly (9) includes a lifting plate (91), a mounting plate (92), an ejector rod (93), a lifting rod (94), and a support column (95). The support column (95) is vertically fixed on the base plate (6). After the lifting plate (91) descends, it can abut against the support column (95). The lifting rod (94) passes through the base plate (6) and is connected to the lifting plate (91). The lifting plate (91) and the mounting plate (92) are fixed by bolts. The lower end of the ejector rod (93) is fixed on the mounting plate (92). The upper end of the ejector rod (93) passes through the lower template (4) and the mold core (3) in sequence and then contacts the forming cavity (31).

7. The injection mold for a seat armrest cover according to claim 1, characterized in that, The top plate (1) has an injection interface (11), and the upper template (2) has an injection channel that connects the molding cavity (31) and the injection interface (11).

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