A plastic child safety seat joint assembly undercut molding secondary ejection injection mold

Abstract

The utility model provides a secondary ejection injection mold for undercut molding of a joint component of a plastic child safety seat, comprising an upper mold, a lower mold and an ejection mechanism, wherein the ejection mechanism comprises a secondary ejection structure, and the secondary ejection structure comprises a first ejection structure and a rear ejection structure. When demoulding, the first ejection structure first ejects the entire joint component, and then the rear ejection structure is ejected for the second time through a linkage structure, and because of the position of the rear ejector rod, the joint component rotates with the undercut structure as the center of a circle, thereby demoulding the undercut structure, and the secondary ejection structure adopts a first straight ejector rod and an upper mold to integrally mold the joint component, thereby reducing the mold line generated on the undercut structure to affect the surface quality of the mold.

Description

Technical Field

[0001] The utility model relates to the field of molds, in particular to an undercut molding secondary ejection injection mold for a joint component of a plastic child safety seat. Background Art

[0002] Related art plastic child safety seat joint assembly 9 such as Figure 1 As shown, the joint assembly 9 includes a truncated cone 91 and a handle 92. During installation, the requirements for the side annular surface of the truncated cone are relatively high, and there is an undercut structure 93 at the connection between the truncated cone and the handle. For similar undercut structures 93, a slanted ejection structure is often used for mold injection molding. The so-called slanted ejection structure includes a slanted ejector rod and a power source. The slanted ejector rod is tilted against the mold to be ejected, and the power source ejects the slanted ejector rod along the mold opening direction. The slanted ejector rod utilizes the tilt angle to tilt the mold to be ejected, thereby reducing the situation where the undercut structure is stuck in the upper and lower molds. The use of the slanted ejection method generally leads to the appearance of a mold line here, and the plastic child safety seat joint assembly 9 of the related technology has relatively high requirements for the surface here, and the mold line will affect the quality. Utility Model Content

[0003] In order to reduce the occurrence of mold lines in the undercut structure at the connection between the side ring surface and the handle in the related art caused by the use of an inclined top structure, the present application provides an undercut molding secondary ejection injection mold for a plastic child safety seat joint assembly.

[0004] The present application provides a plastic child safety seat joint assembly undercut molding secondary ejection injection mold adopts the following technical solution:

[0005] A secondary ejection injection mold for undercut molding of a joint assembly of a plastic child safety seat, comprising an upper mold, a lower mold and an ejection mechanism, wherein the ejection mechanism comprises a secondary ejection structure, wherein the secondary ejection structure comprises a first ejection structure and a second ejection structure, wherein the first ejection structure comprises a first ejection plate, a first driving member, a first straight ejector rod and a plurality of second straight ejector rods, wherein the first straight ejector rod and the plurality of second straight ejector rods are arranged on the first ejection plate, wherein the first driving member is used for driving the first ejection plate to move along a mold opening and closing direction, wherein the first straight ejector rod is arranged below the undercut structure and cooperates with the upper mold and the lower mold to form the undercut structure;

[0006] The rear ejector structure includes a second ejector plate, a second driving member, a linkage structure and a rear ejector rod. The second driving member is used to drive the second ejector plate to move along the direction of mold opening and closing. The rear ejector rod passes through the lower mold and abuts against the lower side surface of the end of the joint assembly away from the handle. When demolding, the first ejector structure ejects the inverted structure, and the linkage structure drives the rear ejector rod to eject the joint assembly for the second time.

[0007] Through the above technical solution, when demolding, the first ejection structure first ejects the entire joint assembly, and then the rear ejection structure is ejected for the second time through the linkage structure. Because of the position of the rear ejector rod, the joint assembly rotates with the undercut structure as the center, thereby demolding the undercut structure. The secondary ejection structure adopts the first straight ejector rod and the upper mold to form the joint assembly in one piece, which reduces the mold line generated on the undercut structure to affect the surface quality of the mold.

[0008] Preferably, the linkage structure includes a linkage block and a linkage rod, the linkage block is rotatably arranged on the second top plate, a slot is opened at one end of the linkage block, the rear ejector rod is arranged in the slot, and the linkage rod is arranged on the other end of the linkage block. When demolding, the linkage structure moves toward the lower mold along with the second top plate until the linkage rod abuts against the lower mold, forcing the linkage block to rotate so that the rear ejector rod ejects the joint assembly for a second time.

[0009] Through the above technical solution, when demolding is performed, the second driving member drives the second top plate to move in the demolding direction, so that the linkage rod first abuts against the lower mold, thereby forcing the linkage block to rotate, thereby driving the rear push rod clamped at the other end of the linkage block to move upward, thereby performing a second ejection and demolding of the joint assembly.

[0010] Preferably, the second top plate is arranged below the first top plate, the first top plate is provided with a limiting groove, the limiting groove is arranged directly above the linkage block, the linkage block rotates in the limiting groove, and the rear top rod and the linkage column pass through the first top plate.

[0011] Through the above technical solution, the limiting groove is designed to limit the ejection distance of the rear ejector, thereby reducing the situation where the ejection range of the rear ejector is too large and affects the subsequent mold closing, and increasing the stability of the mold.

[0012] Preferably, it also includes a spring and a sliding column, one end of the sliding column is set through the lower mold, and the other end is set on the first top plate, the spring is set on the outside of the sliding column, and the two ends of the spring are respectively set on the lower mold and the first top plate, and the spring is always in a stretched state.

[0013] Through the above technical solution, the design of the spring enables the first top plate to be always abutted against the second top plate by the spring, thereby ensuring the limiting function of the limiting groove on the first top plate on the linkage block and increasing the stability of the mold.

[0014] Preferably, a reinforcing sheet is further provided on the inner side of the joint assembly, and the upper mold is further provided with a fixing assembly, the fixing assembly comprising an inlay column, an inlay block and an inlay table, the inlay column and the inlay column are passed through and abutted on the reinforcing sheet, the inlay column is detachably arranged on the upper mold, the inlay column is used to form a straight hole on the handle parallel to the first straight push rod, the inlay table is used to form a round table, the inlay block is inserted on the inlay table, and the second straight push rod abuts against the inlay table

[0015] Through the above technical scheme, the reinforcement plate is used to strengthen the connection strength between the round table and the handle of the joint component. The design of the inlay column and the inlay block can limit the position of the reinforcement plate to facilitate the reinforcement plate to be fixed at the desired position during injection molding. At the same time, the inner and outer surfaces of the joint component are formed by the inlay column, the inlay block, the inlay table and the second straight push rod, thereby ensuring the accuracy of the inner and outer surfaces.

[0016] Preferably, a core pulling structure is also included, which includes a core pulling table, a cylinder, a guide column, a slider and two core pulling columns. The core pulling table is tilted toward the lower mold, and the inclination angle of the core pulling table is the same as the inclination angle of the handle. The guide column is arranged on the core pulling table, and the length direction of the guide column is parallel to the length direction of the handle. The slider slides on the core pulling table through the guide column. The core pulling column is arranged on one end of the slider facing the lower mold. The core pulling column is used to form the inner side of the handle. The telescopic rod of the cylinder is arranged toward the slider, and the cylinder is used to drive the slider to slide.

[0017] Through the above technical solution, the design of the core-pulling column ensures the precise molding of the inner surface of the handle, and the design of the core-pulling structure ensures smooth demoulding, thereby improving the accuracy and stability of mold molding.

[0018] Preferably, a double switch structure is also included, the double switch structure includes two process switches and two switch columns, the two switch columns are arranged on the slider, the switch columns are arranged parallel to the length direction of the slider, the two switch columns are staggered and relatively arranged, the two process switches are arranged on the core pulling table, one is arranged close to the lower mold, and the other is arranged close to the cylinder. When the core pulling operation is performed, the switch column on one side gradually moves away from the process switch, and the switch column on the other side gradually approaches the process switch until it is pressed against the process switch.

[0019] Through the above technical solution, when the process switch on one side close to the core pulling block is away from the switch column and the process switch on the other side away from the core pulling block abuts against the switch column, the secondary ejection structure starts the demolding operation; conversely, the secondary ejection structure starts the mold closing operation, ensuring that the core pulling structure will not affect the movement of the ejection structure during the demolding and closing process, thereby ensuring the safety of the mold during operation.

[0020] The technical effects of this utility model are mainly reflected in the following aspects:

[0021] 1. The utility model designs a secondary ejection structure, adopts the first straight ejector rod and the upper mold integrally formed handle and the undercut structure at the junction of the round table, and the secondary ejection avoids the use of an inclined ejection structure, thereby reducing the mold line generated on the undercut structure to affect the mold surface quality;

[0022] 2. The utility model designs a linkage structure so that the secondary ejection effect can be automatically achieved during the demoulding process;

[0023] 3. The utility model cooperates with the first top plate, the spring and the sliding column, so that the first top plate always abuts against the second top plate, ensuring that the linkage structure can work stably in the limit groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the related technology;

[0025] Figure 2 For related technologies Figure 1 Schematic diagram of the cross section of line AA in FIG.

[0026] Figure 3 It is a schematic diagram of the overall structure of an embodiment of the present application;

[0027] Figure 4 This is a partial structural schematic diagram of an embodiment of the present application, in which the upper mold and part of the cooling pipe are removed;

[0028] Figure 5 In the embodiment of this application Figure 4 The enlarged schematic diagram of point B in the middle;

[0029] Figure 6 This is a schematic diagram of the structure of the embodiment of the present application with part of the structure removed from the bottom;

[0030] Figure 7 In the embodiment of this application Figure 6 Schematic diagram of the cross section along the CC line;

[0031] Figure 8 In the embodiment of this application Figure 7 The enlarged schematic diagram of point D in the middle;

[0032] Fig. 9 This is a schematic diagram of the overall structure of the linkage block in the embodiment of the present application;

[0033] Fig.10 In the embodiment of this application Figure 4 Enlarged schematic diagram of point E in the middle.

[0034] Reference numerals: 1, upper mold; 11, injection port; 12, runner; 13, fixing assembly; 131, column; 132, block; 133, table; 2, lower mold; 3, ejector mechanism; 31, secondary ejector structure; 32, first ejector structure; 321, first ejector plate; 3211, limiting groove; 322, first straight ejector rod; 323, second straight ejector rod; 33, rear ejector structure; 331, second ejector plate; 332, linkage structure; 333, linkage block; 3331, slot; 334. Linking rod; 335. Rear push rod; 34. Core pulling structure; 341. Core pulling table; 342. Cylinder; 343. Guide column; 344. Slider; 345. Core pulling column; 35. Double switch structure; 351. Process switch; 352. Switch column; 36. Slanted top structure; 4. Cavity; 5. Spring; 6. Sliding column; 7. Reinforcement sheet; 8. Cooling pipe; 9. Joint assembly; 91. Round table; 92. Handle; 93. Undercut structure; 94. Straight hole; 95. Side hole. DETAILED DESCRIPTION

[0035] The following is combined with Figure 1-10 , the specific implementation methods of the utility model are further described in detail to make the technical solution of the utility model easier to understand and grasp.

[0036] The present application embodiment discloses a plastic child safety seat joint assembly undercut molding secondary ejection injection mold:

[0037] Reference Figure 1-Figure 10 A secondary ejection injection mold for undercut molding of a joint assembly of a plastic child safety seat, comprising an upper mold 1, a lower mold 2 and an ejection mechanism 3, wherein the ejection mechanism 3 comprises a secondary ejection structure 31, wherein the secondary ejection structure 31 comprises a first ejection structure 32 and a second ejection structure 33, wherein the first ejection structure 32 comprises a first ejection plate 321, a first driving member and a first straight ejector rod 322 and a plurality of second straight ejector rods 323, wherein the first straight ejector rod 322 and the plurality of second straight ejector rods 323 are fixed on the first ejector plate 321, wherein the first driving member may be a device such as an oil cylinder, which should be fixed below the first ejector plate 321, wherein the telescopic rod of the device should be arranged toward the first ejector plate 321, and used for driving the first ejector plate 321 to move along the direction of mold opening and closing. The first straight ejector rod 322 is arranged below the undercut structure 93 and cooperates with the upper mold 1 and the lower mold 2 to form the undercut structure 93;

[0038] The rear top structure 33 includes a second top plate 331, a second driving member, a linkage structure 332 and a rear top rod 335. The second driving member can be a device such as a cylinder, which should be fixed below the second top plate 331. The telescopic rod of the device should be set toward the second top plate 331 to drive the second top plate 331 to move along the mold opening and closing direction. The rear top rod 335 passes through the lower mold 2 and abuts against the lower side of the end of the joint component 9 away from the handle 92. When demolding, the first top structure 32 ejects the undercut structure 93, and the linkage structure 332 drives the rear top rod 335 to eject the joint component 9 for the second time. When demoulding, the first ejection structure 32 first ejects the entire joint assembly 9, and then the rear ejection structure 33 is ejected for the second time through the linkage structure 332. Due to the position of the rear ejector rod 335, the joint assembly 9 rotates with the undercut structure 93 as the center, thereby demoulding the undercut structure 93. The secondary ejection structure 31 adopts the first straight ejector rod 322 and the upper mold 1 to integrally form the joint assembly 9, thereby reducing the mold line generated on the undercut structure 93 to affect the mold surface quality.

[0039] Reference Figure 1-Figure 10 The linkage structure 332 includes a linkage block 333 and a linkage rod 334. The linkage block 333 rotates on the second top plate 331. A slot 3331 is provided at one end of the linkage block 333. The rear ejector rod 335 is fixed in the slot 3331. The linkage rod 334 is fixed on the other end of the linkage block 333. When demolding, the second driving member drives the second top plate 331 to move along the demolding direction, so that the linkage rod 334 first abuts against the lower mold 2, thereby forcing the linkage block 333 to rotate, thereby driving the rear ejector rod 335 connected to the other end of the linkage block 333 to move upward, thereby performing a second ejection demolding on the joint assembly 9.

[0040] Reference Figure 1-Figure 10 The upper mold 1, the lower mold 2, and the ejection mechanism 3 together form a casting cavity 4. The upper mold 1 also includes an injection port 11 and a runner 12 connected to the injection port 11. The runner 12 connects the injection port 11 and the cavity 4. The injection port 11 is connected to an external injection molding machine, and the joint component 9 is injected into the cavity 4 through the runner 12.

[0041] Reference Figure 1-Figure 10 The second top plate 331 is located below the first top plate 321. The first top plate 321 is provided with a limiting groove 3211. The limiting groove 3211 is located directly above the linkage block 333. The linkage block 333 rotates in the limiting groove 3211. The rear ejector rod 335 and the linkage column pass through the first top plate 321. The limiting groove 3211 is designed to limit the ejection distance of the rear ejector rod 335, thereby reducing the situation where the ejection range of the rear ejector rod 335 is too large to affect the subsequent mold closing, and increasing the stability of the mold.

[0042] Reference Figure 1-Figure 10, and also includes a spring 5 and a slide post 6. One end of the slide post 6 passes through the lower mold 2, and the other end is fixed on the first top plate 321. The spring 5 is fixed on the outside of the slide post 6. The two ends of the spring 5 are respectively fixed to the lower mold 2 and the first top plate 321. The spring 5 is always in a stretched state. The design of the spring 5 allows the first top plate 321 to always be abutted against the second top plate 331 by the spring 5, thereby ensuring the limiting function of the limiting groove 3211 on the first top plate 321 on the linkage block 333, thereby increasing the stability of the mold.

[0043] Reference Figure 1-Figure 10 A reinforcing sheet 7 is also fixed to the inner side of the joint assembly 9, and the upper mold 1 is also provided with a fixing assembly 13, which includes a column 131, a block 132 and a table 133. The column 131 and the column 131 are inserted into the upper mold 1, and the column 131 is used to form a straight hole 94 on the handle 92 parallel to the first straight push rod 322, and the table 133 is used to form a round table 91, and the block 132 is inserted into the table 133, and the second straight push rod 322 is inserted into the table 133. The push rod 323 abuts against the inlay 133, and the inlay 133 is fixed on the upper mold 1. The reinforcing plate 7 is used to reinforce the connection strength between the round table 91 of the joint component 9 and the handle 92. The design of the column 131 and the block 132 can limit the position of the reinforcing plate 7 to facilitate the fixing of the reinforcing plate 7 at the desired position during injection molding. At the same time, the inner and outer surfaces of the joint component 9 are formed by the column 131, the block 132, the inlay 133 and the second straight push rod 323, thereby ensuring the accuracy of the inner and outer surfaces.

[0044] Reference Figure 1-Figure 10 A cooling pipe 8 is also provided in the upper and lower molds 2. The cooling pipe 8 is used to speed up the product molding cycle, which is beneficial to improving production efficiency and ensuring product quality.

[0045] Reference Figure 1-Figure 10 , and also includes a core pulling structure 34, which includes a core pulling table 341, a cylinder 342, a guide column 343, a slider 344 and two core pulling columns 345. The core pulling table 341 is tilted toward the lower mold 2, and the tilt angle of the core pulling table 341 is the same as the tilt angle of the handle 92. The guide column 343 is fixed on the core pulling table 341, and the length direction of the guide column 343 is parallel to the length direction of the handle 92. The slider 344 slides on the core pulling table 341 through the guide column 343. The core pulling column 345 is fixed on the end of the slider 344 facing the lower mold 2. The core pulling column 345 is used to mold the inner side of the handle 92. The telescopic rod of the cylinder 342 is set toward the slider 344, and the cylinder 342 is used to drive the slider 344 to slide. The design of the core pulling column 345 ensures the precise molding of the inner surface of the handle 92, and the design of the core pulling structure 34 ensures smooth demoulding, thereby improving the accuracy and stability of mold molding.

[0046] Reference Figure 1-Figure 10The insert column 131 fits against the core pulling column 345, reducing interference and collision that may be caused during the core pulling process.

[0047] Reference Figure 1-Figure 10 , and also includes a double switch structure 35, the double switch structure 35 includes two process switches 351 and two switch columns 352, the two switch columns 352 are fixed on the slider 344, the switch columns 352 are arranged parallel to the length direction of the slider 344, the two switch columns 352 are arranged oppositely with a staggered position, and the two process switches 351 are fixed on the core pulling table 341, one is arranged close to the lower mold 2, and the other is arranged close to the cylinder 342. When the core pulling operation is performed, the switch column 352 on one side gradually moves away from the process switch 351, and the switch column 352 on the other side gradually approaches the process switch 351 until it is pressed against the process switch 351. When the demoulding operation is performed, the core pulling structure 34 is the first to act. When the process switch 351 on one side close to the core pulling block is away from the switch column 352 and the process switch 351 on the other side away from the core pulling block abuts against the switch column 352, the secondary ejection structure 31 starts the demoulding operation; otherwise, the secondary ejection structure 31 starts the mold closing operation, ensuring that the core pulling structure 34 will not affect the movement of the ejection structure during the demoulding and closing process, thereby ensuring the safety of the mold during operation.

[0048] Reference Figure 1-Figure 10 A side hole 95 is designed on the handle 92 of the joint component 9, and the molding and demoulding of the side hole 95 adopt the inclined top structure 36 commonly seen in the market.

[0049] Of course, the above are only typical examples of the present invention. In addition, the present invention may have many other specific implementations. Any technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present invention.

Claims

1. A secondary ejection injection mold for undercut molding of a joint assembly of a plastic child safety seat, comprising an upper mold (1), a lower mold (2) and an ejection mechanism (3), characterized in that: The ejection mechanism (3) comprises a secondary ejection structure (31), the secondary ejection structure (31) comprises a first ejection structure (32) and a second ejection structure (33), the first ejection structure (32) comprises a first ejection plate (321), a first driving member, a first straight ejector rod (322) and a plurality of second straight ejector rods (323), the first straight ejector rod (322) and the plurality of second straight ejector rods (323) being arranged on the first ejection plate (321), the first driving member being used for driving the first ejection plate (321) to move along a mold opening and closing direction, the first straight ejector rod (322) being arranged below the undercut structure (93) and cooperating with the upper mold (1) and the lower mold (2) to form the undercut structure (93); The rear ejector structure (33) comprises a second ejector plate (331), a second driving member, a linkage structure (332) and a rear ejector rod (335). The second driving member is used to drive the second ejector plate (331) to move along the mold opening and closing direction. The rear ejector rod (335) passes through the lower mold (2) and abuts against the lower side surface of the joint assembly (9) away from the handle (92). When demolding, the first ejector structure (32) ejects the undercut structure (93), and the linkage structure (332) drives the rear ejector rod (335) to eject the joint assembly (9) for the second time.

2. The undercut secondary ejection injection mold for a plastic child safety seat joint assembly according to claim 1, characterized in that: The linkage structure (332) comprises a linkage block (333) and a linkage rod (334); the linkage block (333) is rotatably arranged on the second top plate (331); a slot (3331) is provided at one end of the linkage block (333); the rear ejector rod (335) is arranged in the slot (3331); and the linkage rod (334) is arranged at the other end of the linkage block (333); when demoulding is performed, the linkage structure (332) moves toward the lower mold (2) along with the second top plate (331) until the linkage rod (334) abuts against the lower mold (2), forcing the linkage block (333) to rotate so that the rear ejector rod (335) ejects the joint assembly (9) for a second time.

3. The undercut secondary ejection injection mold for the joint assembly of a plastic child safety seat according to claim 2, characterized in that: The second top plate (331) is arranged below the first top plate (321); the first top plate (321) is provided with a limiting groove (3211); the limiting groove (3211) is arranged directly above the linkage block (333); the linkage block (333) rotates in the limiting groove (3211); and the rear top rod (335) and the linkage column pass through the first top plate (321).

4. The undercut secondary ejection injection mold for the joint assembly of a plastic child safety seat according to claim 3, characterized in that: It also includes a spring (5) and a slide column (6), one end of the slide column (6) is arranged through the lower mold (2), and the other end is arranged on the first top plate (321), the spring (5) is arranged on the outside of the slide column (6), and the two ends of the spring (5) are respectively arranged on the lower mold (2) and the first top plate (321), and the spring (5) is always in a stretched state.

5. The undercut secondary ejection injection mold for a plastic child safety seat joint assembly according to claim 1, characterized in that: A reinforcing plate (7) is also provided on the inner side of the joint assembly (9), and the upper mold (1) is also provided with a fixing assembly (13), wherein the fixing assembly (13) comprises a column (131), an insert (132) and a platform (133), wherein the column (131) and the column (131) are passed through and abutted against the reinforcing plate (7), wherein the column (131) is detachably provided on the upper mold (1), wherein the column (131) is used for forming a straight hole (94) on the handle (92) which is parallel to the first straight push rod (322), wherein the platform (133) is used for forming a round table (91), wherein the insert (132) is inserted into the platform (133), and wherein the second straight push rod (323) abuts against the inside of the platform (133).

6. The undercut secondary ejection injection mold for a plastic child safety seat joint assembly according to claim 1, characterized in that: The core pulling structure (34) is also included. The core pulling structure (34) includes a core pulling table (341), a cylinder (342), a guide column (343), a slider (344) and two core pulling columns (345). The core pulling table (341) is arranged to be inclined toward the lower mold (2). The inclination angle of the core pulling table (341) is the same as the inclination angle of the handle (92). The guide column (343) is arranged on the core pulling table (341). The length of the guide column (343) is The sliding block (344) slides on the core-pulling table (341) through the guide column (343). The core-pulling column (345) is arranged on the end of the sliding block (344) facing the lower mold (2). The core-pulling column (345) is used to form the inner side of the handle (92). The telescopic rod of the cylinder (342) is arranged toward the sliding block (344), and the cylinder (342) is used to drive the sliding block (344) to slide.

7. The undercut secondary ejection injection mold for a plastic child safety seat joint assembly according to claim 6, characterized in that: The invention also includes a double switch structure (35), wherein the double switch structure (35) includes two process switches (351) and two switch columns (352), wherein the two switch columns (352) are arranged on the slider (344), the switch columns (352) are arranged parallel to the length direction of the slider (344), and the two switch columns (352) are arranged opposite to each other in a staggered manner. The two process switches (351) are arranged on the core pulling table (341), one is arranged close to the lower mold (2), and the other is arranged close to the cylinder (342). When the core pulling operation is performed, the switch column (352) on one side gradually moves away from the process switch (351), and the switch column (352) on the other side gradually moves close to the process switch (351) until it is pressed against the process switch (351).

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