Telescopic peripheral core-pulling structure and mold

Abstract

A telescopic peripheral core-pulling structure and a mold, the telescopic peripheral core-pulling structure comprising a fixed sleeve, a plurality of inclined ejector blocks and an ejector rod, the fixed sleeve being provided with a first through hole penetrating through upper and lower end faces thereof; the plurality of inclined ejector blocks being movably installed in the first through hole, the plurality of inclined ejector blocks being enclosed and spliced to form a column body, the column body being formed with a second through hole coaxial with the first through hole, each inclined ejector block comprising an inner wall in the second through hole, the inner wall comprising a first wall surface and a second wall surface arranged up and down along an axis direction of the second through hole and a first step surface forming a height difference between the first wall surface and the second wall surface; the ejector rod being movably arranged in the first through hole, the ejector rod being detachably connected with the column body, the ejector rod being configured to eject the column body out of the first through hole or to pull the plurality of inclined ejector blocks to move into the first through hole so as to splice the plurality of inclined ejector blocks to form the column body. The telescopic peripheral core-pulling structure of the present application is simple in structure, compact, low in manufacturing cost and easy to assemble.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of injection molding equipment, in particular to a telescopic peripheral core-pulling structure and a mold. BACKGROUND

[0002] The existing mold and core structure are matched to integrally form an injection molding product, wherein the core structure includes a plurality of sliding blocks matched with each other. After the injection molding product is formed, the plurality of sliding blocks are gradually pulled out, and a complete injection molding product is obtained. The complexity of the core structure is closely related to the structure of the injection molding product, which is illustrated below.

[0003] The injection molding product includes a cover plate, an inner cylinder connected to the surface of the cover plate, and an outer cylinder. The inner cylinder is coaxially arranged with the outer cylinder, is located on the inner side of the outer cylinder, and is arranged in parallel and opposite to the outer cylinder. The outer wall of the inner cylinder away from the cover plate forms an undercut structure, which is annular and protrudes towards the outer cylinder. Due to the obstruction of the outer cylinder, the space between the inner cylinder and the outer cylinder is limited, and the sliding blocks of the core structure need to be designed more skillfully, and the number of sliding blocks also needs to be increased. A plurality of sliding blocks are spliced together to cooperate with the injection molding to form the gap of the inner cylinder and the undercut structure. Therefore, for the injection molding product with the undercut structure, a core structure with more complex structure needs to be matched, which causes the problems of increased manufacturing cost and improved assembly difficulty. SUMMARY

[0004] Therefore, the present application provides a telescopic peripheral core-pulling structure, which is simple in structure, compact, low in manufacturing cost, and easy to assemble.

[0005] A telescopic peripheral core-pulling structure includes:

[0006] A fixed sleeve is provided with a first through hole penetrating through the upper and lower end faces thereof;

[0007] A plurality of inclined blocks are movably installed in the first through hole, and the plurality of inclined blocks are spliced to form a column body, the column body is formed with a second through hole coaxial with the first through hole, each inclined block includes an inner wall located in the second through hole, the inner wall includes a first wall surface and a second wall surface arranged upward and downward along the axis direction of the second through hole, and a first step surface forming a height difference between the first wall surface and the second wall surface; and

[0008] A ejector rod is movably arranged in the first through hole, the ejector rod is detachably connected with the column body, and the ejector rod is configured to eject the column body from the first through hole or pull the plurality of inclined blocks into the first through hole to splice the plurality of inclined blocks into the column body.

[0009] Optionally, the first wall surface is parallel to the axis of the second through hole, and the second wall surface is arranged obliquely relative to the axis of the second through hole.

[0010] The column has a first inner diameter at the first wall surface and a second inner diameter at the second wall surface, the second inner diameter gradually decreases in a direction away from the first step surface, and the second inner diameter near the first step surface is greater than the first inner diameter.

[0011] Optionally, the first step surface is connected between the first wall surface and the second wall surface, the first step surface has a first included angle with the first wall surface, and the first step surface has a second included angle with the second wall surface.

[0012] Optionally, the inner wall further comprises a groove formed between the first step surface and the second wall surface.

[0013] Optionally, the groove comprises a first bottom surface, a second bottom surface, a first side surface, and a second side surface, the first side surface is arranged opposite to the first step surface, the first bottom surface is connected between the first step surface and the first side surface, the second bottom surface is connected between the first side surface and the second side surface, the second side surface is arranged staggered to the first side surface, and the second side surface is connected to the second wall surface.

[0014] Optionally, the telescopic peripheral core-pulling structure further comprises an intermediate shaft, the intermediate shaft comprises a head portion and a rod portion connected to each other, the head portion comprises a first surface and a second surface and a second step surface forming a height difference between the first surface and the second surface;

[0015] The intermediate shaft is arranged in the second through hole, a first injection molding gap is formed between the first surface and the first wall surface, the second surface is in contact with the second wall surface, a second injection molding gap is formed between the first step surface and the second step surface, the first injection molding gap and the second injection molding gap are in communication, the first injection molding gap is used for injection molding to form an inner cylinder, and the second injection molding gap is used for injection molding to form an undercut structure connected to the inner cylinder.

[0016] Optionally, the second step surface is connected to the first surface, the head portion further comprises a third step surface and a fourth step surface, the third step surface is connected between the second step surface and the fourth step surface, the fourth step surface is arranged staggered to the second step surface, and the fourth step surface is connected to the second surface.

[0017] Optionally, the fixed sleeve comprises a top end and a bottom end opposite in the axial direction, and an inner diameter of the first through hole gradually decreases in a direction from the top end to the bottom end.

[0018] When the plurality of inclined ejecting blocks are pulled by the ejector rod from the top end into the first through hole, the plurality of inclined ejecting blocks gradually close together and splice into the column body;

[0019] When the column body is pushed by the ejector rod from the top end out of the first through hole, the plurality of inclined ejecting blocks gradually unfold.

[0020] Optionally, the hole wall of the first through hole is provided with a plurality of sliding grooves, each of the sliding grooves is arranged to extend from the top end to the bottom end, the outer wall opposite to the inner wall of each of the inclined ejecting blocks is provided with a sliding block, and the slidable connection between each of the inclined ejecting blocks and the fixed sleeve is realized through cooperation of the sliding block and the sliding groove.

[0021] Optionally, the cross section of each of the sliding groove and the sliding block is dovetail-shaped.

[0022] Optionally, the bottom of each of the inclined ejecting blocks is provided with a connecting block, the top of the ejector rod is provided with a plurality of connecting grooves, the plurality of connecting grooves are arranged to be spaced apart from each other around the central axis of the ejector rod, and the detachable connection between each of the inclined ejecting blocks and the ejector rod is realized through cooperation of the connecting block and the connecting groove.

[0023] Optionally, the fixed sleeve comprises a top end face and a side face, the side face comprises a first annular face and a second annular face, the first annular face is connected between the top end face and the second annular face, the outer diameter of the fixed sleeve at the first annular face is smaller than the outer diameter of the fixed sleeve at the second annular face, the top end face is used for cooperating with a mold to injection mold a cover plate, the first annular face is used for cooperating with the mold to injection mold an outer cylinder, and the outer cylinder and the inner cylinder are both connected to the lower surface of the cover plate.

[0024] Optionally, the ejector rod is provided with a third through hole penetrating the upper end face and the lower end face of the ejector rod, and the rod part of the intermediate shaft is arranged in the third through hole.

[0025] The application also relates to a mold comprising the telescopic circumferential side core-pulling structure.

[0026] The telescopic circumferential side core-pulling structure and the mold can be used to injection mold a product with a reverse buckling structure, the plurality of inclined ejecting blocks can be pushed out of the fixed sleeve by the ejector rod after the product is injection molded, and the product can be obtained by pulling out each of the inclined ejecting blocks from the side, the structure is simple and compact, the method of pulling out the inclined ejecting blocks from the side is simple, the actual demand can be met, the manufacturing cost is low, and the product is easy to assemble. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a split structure schematic view of the telescopic circumferential side core-pulling structure.

[0028] Figures 2 to 4Figure 1 is a schematic diagram of an assembly process of a telescopic peripheral core-pulling structure of the present application.

[0029] Figure 5 Figure 2 is a schematic diagram of a cross-sectional structure of a product formed by injection molding of the telescopic peripheral core-pulling structure of the present application.

[0030] Figure 6 Figure 3 is a schematic diagram of a telescopic peripheral core-pulling structure of the present application. Figure 5 Figure 4 is a schematic diagram of a partial enlarged structure of the telescopic peripheral core-pulling structure shown in Figure 3.

[0031] Figure 7 Figure 5 is a schematic diagram of a structure of the telescopic peripheral core-pulling structure when a product is ejected. Figure 5 Figure 6 is a schematic diagram of a partial enlarged structure of the telescopic peripheral core-pulling structure shown in Figure 5.

[0032] Figure 8 Figure 7 is a schematic diagram of a structure of the telescopic peripheral core-pulling structure when a product is ejected. Figure 7 Figure 8 is a schematic diagram of a partial enlarged structure of the telescopic peripheral core-pulling structure shown in Figure 7.

[0033] Figure 9 Figure 9 is a schematic diagram of a product formed by injection molding using the telescopic peripheral core-pulling structure.

[0034] Figure 10 Figure 10 is a schematic diagram of a partial cross-sectional structure of a bevel ejector block of the present application.

[0035] Figure 11 Figure 11 is a schematic diagram of a partial cross-sectional structure of a head of the present application.

[0036] Figure 12 Figure 12 is a schematic diagram of a partial cross-sectional structure of a head cooperating with a column of the present application. DETAILED DESCRIPTION

[0037] The implementation of the present application will be described by specific embodiments, and those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in the specification.

[0038] In the following description, reference is made to the accompanying drawings, which show several embodiments of the present application. It should be understood that other embodiments can also be used, and mechanical components, structures, electrical and operational changes can be made without departing from the spirit and scope of the present application. The following detailed description should not be considered as limiting, and the terms used herein are only used to describe specific embodiments, and are not intended to limit the present application.

[0039] Although the terms first, second, etc. are used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another.

[0040] Moreover, as used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context indicates otherwise. It will be further understood that the terms "comprises", "comprising", "includes" and / or "including" when used herein, specify the presence of stated features, steps, operations, elements, components, items, kinds and / or groups but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, items, kinds and / or groups thereof. As used herein, the terms "or" and "and / or" are to be interpreted as inclusive, i.e., as meaning one or any combination of items. Thus, "A, B or C" or "A, B and / or C" means any of the following: A; B; C; A and B; A and C; B and C; A, B and C. An exception to this definition will occur only when a combination of elements, functions, steps or acts are in some way inherently mutually exclusive.

[0041] Figure 1 is a split structure diagram of the telescopic peripheral core-pulling structure of the present application, Figures 2 to 4 is a split structure diagram of the telescopic peripheral core-pulling structure of the present application, Figure 5 is a split structure diagram of the telescopic peripheral core-pulling structure of the present application, Figure 6 is a split structure diagram of the telescopic peripheral core-pulling structure of the present application, Figure 5 is a split structure diagram of the telescopic peripheral core-pulling structure of the present application, Figure 7 is a split structure diagram of the telescopic peripheral core-pulling structure of the present application, Figure 5 is a split structure diagram of the telescopic peripheral core-pulling structure of the present application, Figure 8 is a split structure diagram of the telescopic peripheral core-pulling structure of the present application, Figure 7 is a split structure diagram of the telescopic peripheral core-pulling structure of the present application, Figure 9 is a split structure diagram of the telescopic peripheral core-pulling structure of the present application, Figures 1 to 9 , the telescopic peripheral core-pulling structure comprises:

[0042] the fixed sleeve 12 is provided with a first through hole 101 penetrating through the upper and lower end faces thereof;

[0043] the plurality of inclined ejecting blocks 13 are movably installed in the first through hole 101, the plurality of inclined ejecting blocks 13 are enclosed and spliced into a column body, the column body is formed with a second through hole 102 coaxial with the first through hole 101, each inclined ejecting block 13 comprises an inner wall 131 located in the second through hole 102, the inner wall 131 comprises a first wall surface 1311 and a second wall surface 1312 arranged upward and downward along the axial direction of the second through hole 102, and a first step surface 1313 forming a height difference between the first wall surface 1311 and the second wall surface 1312; and

[0044] The ejector pin 14 is movably arranged in the first through hole 101, and is detachably connected with the column. The ejector pin 14 is configured to eject the column from the first through hole 101, or pull the plurality of inclined ejector blocks 13 into the first through hole 101, so that the plurality of inclined ejector blocks 13 are spliced into the column.

[0045] The telescopic peripheral core-pulling structure and the mold can be used to injection-mold the product 20 with the undercut structure 24. After the product 20 is injection-molded, the plurality of inclined ejector blocks 13 are ejected from the fixed sleeve 12 by the ejector pin 14, and the inclined ejector blocks 13 are separated from the side to obtain the product 20. The structure is simple and compact, the method of separating the inclined ejector blocks 13 from the side is simple, the actual demand can be met, the manufacturing cost is low, and the product is easy to assemble.

[0046] Optionally, as shown in Figure 5 , the first wall surface 1311 is parallel to the axis of the second through hole 102, and the second wall surface 1312 is arranged obliquely relative to the axis of the second through hole 102;

[0047] The column has a first inner diameter at the first wall surface 1311, and has a second inner diameter at the second wall surface 1312. The second inner diameter gradually decreases in a direction away from the first step surface 1313. The second inner diameter at the position close to the first step surface 1313 is greater than the first inner diameter.

[0048] Optionally, Figure 10 is a partial cross-sectional structure schematic view of the inclined ejector block of the present application, as shown in Figure 9 and Figure 10 , the inner wall 131 further includes a groove 104 formed between the first step surface 1313 and the second wall surface 1312. In the present embodiment, the groove 104 is used to injection-mold a rib 243 at the edge of the undercut structure 24.

[0049] Optionally, as shown in Figure 10 , the groove 104 includes a first bottom surface 1041, a second bottom surface 1042, a first side surface 1043, and a second side surface 1044. The first side surface 1043 is arranged opposite to the first step surface 1313. The first bottom surface 1041 is connected between the first step surface 1313 and the first side surface 1043. The second bottom surface 1042 is connected between the first side surface 1043 and the second side surface 1044. The second side surface 1044 is arranged staggered with the first side surface 1043, and is connected with the second wall surface 1312. In the present embodiment, the first step surface 1313 and the first wall surface 1311 are connected through an arc surface. The first step surface 1313 and the first side surface 1043 are parallel and arranged opposite to each other. The first bottom surface 1041 is perpendicularly connected with the first step surface 1313 and the first side surface 1043, respectively. The second bottom surface 1042 is perpendicularly connected with the first side surface 1043. The second side surface 1044 is a concave arc surface.

[0050] In another embodiment, the groove 104 only includes the first bottom surface 1041 and the first side surface 1043, the first side surface 1043 is arranged opposite to the first step surface 1313, the first bottom surface 1041 is connected between the first step surface 1313 and the first bottom surface 1041, and the first side surface 1043 is connected with the second wall surface 1312. In this embodiment, the first side surface 1043 is arranged parallel and opposite to the first step surface 1313, the first bottom surface 1041 is perpendicularly connected with the first side surface 1043, the first step surface 1313 and the first side surface 1043 is perpendicularly connected with the first bottom surface 1041, and the included angle between the first side surface 1043 and the second wall surface 1312 is greater than 90°.

[0051] In other embodiments, the groove 104 is not arranged between the first step surface 1313 and the second wall surface 1312 of the inner wall 131, the first step surface 1313 is connected between the first wall surface 1311 and the second wall surface 1312, the first step surface 1313 has a first included angle with the first wall surface 1311, and the first step surface 1313 has a second included angle with the second wall surface 1312. In this embodiment, the first step surface 1313 is connected with the first wall surface 1311 through an arc surface, and the first included angle is, for example, 90°; the first step surface 1313 is connected with the second wall surface 1312 through an arc surface, and the second included angle is, for example, less than 90°.

[0052] Optionally, as shown in Figure 1 , Figure 5 and Figure 7 , the telescopic peripheral core-pulling structure further includes an intermediate shaft 15, the intermediate shaft 15 includes a head portion 151 and a rod portion 152 connected with each other, the head portion 151 includes a first surface 1511 and a second surface 1512 and a second step surface 1513 forming a height difference between the first surface 1511 and the second surface 1512.

[0053] The intermediate shaft 15 is arranged in the second through hole 102, the first surface 1511 and the first wall surface 1311 form a first injection molding gap, the second surface 1512 is in contact with the second wall surface 1312, the first step surface 1313 and the second step surface 1513 form a second injection molding gap, the first injection molding gap and the second injection molding gap are communicated, the first injection molding gap is used for injection molding to form the inner cylinder 22 of the product 20, and the second injection molding gap is used for injection molding to form the undercut structure 24 connected with the inner cylinder 22. In this embodiment, the first surface 1511 is arranged parallel and opposite to the first wall surface 1311, the second surface 1512 is parallel to the second wall surface 1312, that is, the inclination angle of the second surface 1512 is the same as the inclination angle of the second wall surface 1312, and the second step surface 1513 is arranged parallel and opposite to the first step surface 1313.

[0054] Optionally, the first surface 1511 is parallel to the axis of the second through hole 102, and the second surface 1512 is arranged obliquely relative to the axis of the second through hole 102; the head 151 has a first outer diameter at the first surface 1511, which is smaller than the first inner diameter; the head 151 has a second outer diameter at the second surface 1512, which gradually decreases in a direction away from the first surface 1511, and the second outer diameter at the second step surface 1513 is greater than the first outer diameter.

[0055] In an embodiment, the second step surface 1513 is connected between the first surface 1511 and the second surface 1512, the included angle between the second step surface 1513 and the first surface 1511 is 90°, and the included angle between the second step surface 1513 and the second surface 1512 is less than 90°.

[0056] In another embodiment, Figure 11 is a schematic diagram of a partial cross-sectional structure of the head of the application, Figure 12 is a schematic diagram of a partial cross-sectional structure of the head and the column body when they are matched, as shown in Figure 10 、 Figure 11 and Figure 12 , the second step surface 1513 is connected with the first surface 1511, and the included angle between the second step surface 1513 and the first surface 1511 is 90°; the head 151 of the intermediate shaft 15 further comprises a third step surface 1514 and a fourth step surface 1515, the third step surface 1514 is connected between the second step surface 1513 and the fourth step surface 1515, and the fourth step surface 1515 is arranged staggered with the second step surface 1513, preferably, the fourth step surface 1515 is parallel to the second step surface 1513, and the fourth step surface 1515 is connected with the second surface 1512. In the embodiment, the third step surface 1514 and the second step surface 1513 are connected through an arc surface, the included angle between the third step surface 1514 and the second step surface 1513 is a third included angle, the included angle between the third step surface 1514 and the fourth step surface 1515 is a fourth included angle, and the included angle between the fourth step surface 1515 and the second surface 1512 is a fifth included angle; preferably, the third included angle and the fourth included angle are both greater than or equal to 90°, and the fifth included angle is less than 90°.

[0057] As shown in Figure 12As shown in

[0058] Optionally, as shown in Figure 3 、 Figure 4 and Figure 5 , the fixing sleeve 12 comprises axially opposite top end 12a and bottom end 12b, the inner diameter of the first through hole 101 gradually decreases from the top end 12a to the direction close to the bottom end 12b, that is, at least part of the hole section of the first through hole 101 is trumpet-shaped from large to small;

[0059] When the plurality of inclined blocks 13 are pulled by the top rod 14 to move into the first through hole 101 from the top end 12a, the plurality of inclined blocks 13 gradually close and splice into a column;

[0060] When the column is pushed by the top rod 14 to move out of the first through hole 101 from the top end 12a, the plurality of inclined blocks 13 gradually unfold.

[0061] Optionally, as shown in Figure 2 and Figure 3 , the hole wall of the first through hole 101 is provided with a plurality of sliding grooves 105, each sliding groove 105 is arranged and extends from the top end 12a to the bottom end 12b, the outer wall of each inclined block 13 opposite to the inner wall 131 is provided with a sliding block 132, and the slidable connection between each inclined block 13 and the fixing sleeve 12 is realized by the cooperation of the sliding block 132 and the sliding groove 105. In this embodiment, each sliding groove 105 is arranged obliquely, and each inclined block 13 slides into the first through hole 101 along the oblique sliding groove 105.

[0062] Optionally, the number of sliding grooves 105 matches the number of inclined blocks 13, for example, both are four, but not limited thereto.

[0063] Optionally, the cross section of each sliding groove 105 and sliding block 132 is dovetail-shaped.

[0064] Optionally, as shown in Figure 1As shown, the bottom of each inclined ejector block 13 is provided with a connecting block 133, and the top of the ejector rod 14 is provided with a plurality of connecting grooves 106, which are spaced apart around the central axis of the ejector rod 14. The inclined ejector block 13 and the ejector rod 14 are detachably connected through the cooperation of the connecting block 133 and the connecting groove 106. In this embodiment, the cross-sectional shape of the connecting block 133 and the connecting groove 106 is inverted T-shaped; the connecting block 133 can be gradually fitted into the connecting groove 106 from the side surface of the ejector rod 14.

[0065] Optionally, as shown in Figure 1 The connecting block 133 includes a connecting portion and a limiting portion, the connecting portion is connected perpendicularly to the limiting portion, and the width of the connecting portion is smaller than the width of the limiting portion; the connecting groove 106 includes an avoiding section and a limiting section, the avoiding section is used to accommodate the connecting portion, and the limiting section is used to accommodate the limiting portion. In this embodiment, the ejector rod 14 includes an upper end surface and a side surface, the avoiding section penetrates the upper end surface and the side surface, and the limiting section penetrates the side surface. The connecting block 133 can be gradually fitted into the connecting groove 106 from the side surface of the ejector rod 14.

[0066] Optionally, as shown in Figure 1 , Figure 5 and Figure 7 The fixed sleeve 12 includes a top end surface 121 and a side surface 122, the side surface 122 includes a first annular surface 1221 and a second annular surface 1222, the first annular surface 1221 is connected between the top end surface 121 and the second annular surface 1222, the outer diameter of the fixed sleeve 12 at the first annular surface 1221 is smaller than the outer diameter of the fixed sleeve 12 at the second annular surface 1222, the top end surface 121 is used to cooperate with the mold to injection mold the cover plate 21 of the product 20, the first annular surface 1221 is used to cooperate with the mold to injection mold the outer cylinder 23 of the product 20, and the outer cylinder 23 and the inner cylinder 22 are both connected to the lower surface of the cover plate 21. When the plurality of inclined ejector blocks 13 and the intermediate shaft 15 are both installed in the first through hole 101, the upper end surfaces of the inclined ejector blocks 13 and the intermediate shaft 15 are flush with the top end surface 121 of the fixed sleeve 12.

[0067] Optionally, as shown in Figure 5 and Figure 7 The ejector rod 14 is provided with a third through hole 103 penetrating the upper and lower end surfaces thereof, and the rod portion 152 of the intermediate shaft 15 is arranged in the third through hole 103. In this embodiment, the length of the rod portion 152 of the intermediate shaft 15 is greater than the length of the third through hole 103, and the rod portion 152 of the intermediate shaft 15 can protrude from the bottom of the third through hole 103.

[0068] Optionally, the step of using the telescopic peripheral core-pulling structure to cooperate with the mold to injection mold the product 20 with the inverted buckle structure 24 is as follows:

[0069] Step one, insert the top rod 14 into the first through hole 101 from the bottom end 12b of the fixed sleeve 12, and make the top of the top rod 14 protrude from the top end 12a of the fixed sleeve 12;

[0070] Step two, insert the rod part 152 of the intermediate shaft 15 into the third through hole 103 of the top rod 14, and connect the plurality of inclined top blocks 13 with the connecting blocks 133 and the connecting grooves 106 of the top rod 14;

[0071] Step three, pull down the top rod 14, gradually pull the plurality of inclined top blocks 13 and the intermediate shaft 15 into the first through hole 101, until the plurality of inclined top blocks 13 are spliced into a column, at this time, the first surface 1511 of the head part 151 of the intermediate shaft 15 is oppositely arranged with the first wall surface 1311, and the second surface 1512 is in contact with the second wall surface 1312, as shown in Figure 3 and Figure 4 ;

[0072] Step four, assemble the telescopic peripheral core-pulling structure into the mold as a whole, at this time, the telescopic peripheral core-pulling structure and the inner wall 131 of the mold form an injection cavity with the same shape as the product 20;

[0073] Step five, inject the injection material into the injection cavity through the injection channel on the mold, and then demold after cooling, at this time, the top of the telescopic peripheral core-pulling structure forms the product 20 with the undercut structure 24, wherein the undercut structure 24 is formed in the second injection gap, the inner cylinder 22 is formed in the first injection gap, the outer cylinder 23 is formed in the gap between the first annular surface 1221 and the mold, and the cover plate 21 is formed in the gap between the end surface of the telescopic peripheral core-pulling structure and the mold, as shown in Figure 5 and Figure 6 ;

[0074] Step six, push the column out of the first through hole 101 by using the top rod 14, at this time, the formed product 20 is separated from the fixed sleeve 12, until the plurality of inclined top blocks 13 are completely removed from the first through hole 101, as shown in Figure 7 ;

[0075] Step seven, pull out the inclined top blocks 13 one by one in the horizontal direction, and the required product 20 can be obtained; the product 20 includes the cover plate 21, and the outer cylinder 23 and the inner cylinder 22 connected to the lower surface of the cover plate 21, the inner cylinder 22 is located on the inner side of the outer cylinder 23 and is spaced apart from the outer cylinder 23, the undercut structure 24 is integrally formed on the end outer wall of the inner cylinder 22 and protrudes towards the outer cylinder 23, as shown in Figure 9 .

[0076] The application also relates to a mold comprising the telescopic peripheral core-pulling structure.

[0077] The above embodiments are only illustrative of the principles of the present application and its effects, and are not intended to limit the present application. Any modification or change made by any person skilled in the art without departing from the spirit and scope of the present application shall be covered by the claims of the present application.

Claims

1. A telescopic side core pulling structure, characterized by, The utility model relates to a telescopic side core-pulling structure of a telescopic sleeve, which comprises: a fixed sleeve provided with a first through hole penetrating through upper and lower end faces thereof; a plurality of inclined jacks movably installed in the first through hole, the plurality of inclined jacks being enclosed and spliced to form a column, the column being formed with a second through hole coaxial with the first through hole, each inclined jack comprising an inner wall located in the second through hole, the inner wall comprising a first wall surface and a second wall surface arranged up and down along an axis direction of the second through hole and a first step surface forming a height difference between the first wall surface and the second wall surface; and a ejector rod movably arranged in the first through hole, the ejector rod being detachably connected with the column, the ejector rod being configured to eject the column out of the first through hole or pull the plurality of inclined jacks into the first through hole so as to splice the plurality of inclined jacks to form the column.

2. The retractable side core structure of claim 1, wherein The first wall surface is parallel to the axis of the second through hole, and the second wall surface is arranged obliquely relative to the axis of the second through hole. The column has a first inner diameter at the first wall surface, and has a second inner diameter at the second wall surface, the second inner diameter gradually decreasing in a direction away from the first step surface, and the second inner diameter of the second wall surface close to the first step surface being greater than the first inner diameter.

3. The retractable side core structure of claim 2, wherein The first step surface is connected between the first wall surface and the second wall surface, and has a first included angle with the first wall surface and a second included angle with the second wall surface.

4. The retractable side core structure of claim 2, wherein The inner wall further comprises a groove formed between the first step surface and the second wall surface; or The inner wall further comprises a groove formed between the first step surface and the second wall surface, the groove comprising a first bottom surface, a second bottom surface, a first side surface and a second side surface, the first side surface being arranged opposite to the first step surface, the first bottom surface being connected between the first step surface and the first side surface, the second bottom surface being connected between the first side surface and the second side surface, the second side surface being arranged staggered to the first side surface, and the second side surface being connected with the second wall surface.

5. A telescopic side core pulling structure according to any one of claims 1 to 4, wherein The telescopic side core-pulling structure further comprises an intermediate shaft, the intermediate shaft comprising a head portion and a rod portion connected with each other, the head portion comprising a first surface and a second surface and a second step surface forming a height difference between the first surface and the second surface; The intermediate shaft is arranged in the second through hole, a first injection molding gap is formed between the first surface and the first wall surface, the second surface is in contact with the second wall surface, a second injection molding gap is formed between the first step surface and the second step surface, the first injection molding gap and the second injection molding gap are communicated, the first injection molding gap is used for injection molding an inner cylinder, and the second injection molding gap is used for injection molding a reverse buckle structure connected with the inner cylinder; or The telescopic peripheral core-pulling structure further comprises an intermediate shaft, the intermediate shaft comprises a head and a rod, the head comprises a first surface and a second surface and a second step surface forming a height difference between the first surface and the second surface, the second step surface is connected with the first surface, the head further comprises a third step surface and a fourth step surface, the third step surface is connected between the second step surface and the fourth step surface, the fourth step surface is arranged staggered with the second step surface, and the fourth step surface is connected with the second surface.

6. The retractable side core structure of claim 5, wherein The fixed sleeve comprises axially opposite top and bottom ends, and the inner diameter of the first through hole gradually decreases from the top end to the vicinity of the bottom end; When the jackscrew pulls a plurality of the inclined jacking blocks from the top end into the first through hole, the plurality of the inclined jacking blocks gradually converge and splice into the column; When the jackscrew pushes the column out of the first through hole from the top end, the plurality of the inclined jacking blocks gradually expand.

7. The retractable side core structure of claim 6, wherein The hole wall of the first through hole is provided with a plurality of sliding grooves, each of the sliding grooves is arranged extending from the top end to the bottom end, the outer wall opposite to the inner wall of each of the inclined jacking blocks is provided with a sliding block, and the slidable connection between each of the inclined jacking blocks and the fixed sleeve is realized through the cooperation of the sliding block and the sliding groove; or The hole wall of the first through hole is provided with a plurality of sliding grooves, each of the sliding grooves is arranged extending from the top end to the bottom end, the outer wall opposite to the inner wall of each of the inclined jacking blocks is provided with a sliding block, and the slidable connection between each of the inclined jacking blocks and the fixed sleeve is realized through the cooperation of the sliding block and the sliding groove, and the cross section of each of the sliding grooves and the sliding block is dovetail-shaped.

8. The retractable side core structure of claim 6, wherein The bottom of each of the inclined jacking blocks is provided with a connecting block, the top of the jackscrew is provided with a plurality of connecting grooves, the plurality of connecting grooves are arranged spaced apart from each other around the central axis of the jackscrew, and the detachable connection between each of the inclined jacking blocks and the jackscrew is realized through the cooperation of the connecting block and the connecting groove.

9. The retractable side core structure of claim 5, wherein The fixed sleeve comprises a top end surface and a side surface, the side surface comprises a first annular surface and a second annular surface, the first annular surface is connected between the top end surface and the second annular surface, the outer diameter of the fixed sleeve at the first annular surface is smaller than the outer diameter of the fixed sleeve at the second annular surface, the top end surface is used for cooperating with a mold to injection mold a cover plate, the first annular surface is used for cooperating with the mold to injection mold an outer cylinder, and the outer cylinder and the inner cylinder are both connected to the lower surface of the cover plate; or The fixed sleeve comprises a top end surface and a side surface, the side surface comprises a first annular surface and a second annular surface, the first annular surface is connected between the top end surface and the second annular surface, the outer diameter of the fixed sleeve at the first annular surface is smaller than the outer diameter of the fixed sleeve at the second annular surface, the top end surface is used for cooperating with a mold to injection mold a cover plate, the first annular surface is used for cooperating with the mold to injection mold an outer cylinder, and the outer cylinder and the inner cylinder are both connected to the lower surface of the cover plate, the jackscrew is provided with a third through hole penetrating through the top and bottom end surfaces thereof, and the rod of the intermediate shaft is arranged in the third through hole.

10. A mold characterized in that, A telescopic peripheral core-pulling structure according to any one of claims 1 to 9.

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