Mold core and injection mold

Abstract

The utility model discloses a mold core and an injection mold, and relates to the technical field of injection molds. The mold core comprises a fixed mold core part and a plurality of contraction pieces, and the fixed mold core part is provided with a first central axis; the fixed mold core part is provided with a first end and a second end in the extending direction of the first central axis. A plurality of inclined guide parts are arranged on the side wall of the fixed mold core part; the plurality of inclined guide parts are distributed around the first central axis, and the inclined guide parts are close to the first central axis from the first end to the second end; a first clamping structure is arranged on the outer side wall, close to the second end, of the contraction piece; and the plurality of contraction pieces are configured to slide along the plurality of inclined guide parts, so that the plurality of contraction pieces slide towards one side facing the first end to be switched to an expansion state, and slide towards one side facing the second end to be switched to a contraction state. According to the mold, the smoothness of the demolding process can be improved, and the demolding efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of injection mold technology, and more specifically to mold cores and injection molds. Background Technology

[0002] like Figures 1-2 As shown, this is an injection molded part 10 with an inner hole 11. The inner hole 11 of the injection molded part 10 is generally formed by a mold core. After the existing mold core forms the inner hole 11, the injection molded part 10 needs to be removed from the mold core to achieve demolding.

[0003] However, during the demolding process, to detach the injection molded part 10 from the mold core, it generally includes at least a release step and a release step performed sequentially. The release step involves the mold core releasing the inner hole 11 of the injection molded part 10. A first drive mechanism is generally required to drive the mold core to release the inner hole 11 of the injection molded part 10. The release step involves detaching the released injection molded part 10 from the mold core. This generally requires manual intervention or a second drive mechanism to detach the released injection molded part 10 from the mold core. This results in an uneven demolding process and low demolding efficiency.

[0004] Therefore, how to improve the smoothness of the demolding process in order to improve demolding efficiency remains a technical problem that needs to be solved by those skilled in the art. Utility Model Content

[0005] In view of this, in order to solve the above-mentioned technical problems, this application provides a mold core and an injection mold.

[0006] The mold core includes

[0007] The fixed mold core has a first central axis; the fixed mold core has a first end and a second end along the extension direction of the first central axis; the sidewall of the fixed mold core is provided with a plurality of inclined guides; the plurality of inclined guides are distributed around the first central axis, and the inclined guides approach the first central axis from the first end to the second end;

[0008] The device includes multiple shrinkable components, each with a first locking structure on its outer side wall near the second end. The multiple shrinkable components are configured to slide along multiple inclined guides to switch to an expanded state by sliding the multiple shrinkable components toward the side facing the first end, and to switch to a contracted state by sliding the multiple shrinkable components toward the side facing the second end.

[0009] The injection mold includes a front mold and a rear mold; the front mold includes a front mold base and a front mold core; the rear mold includes a rear mold base and a rear mold core; the front mold core and the rear mold core are both mold cores as described above;

[0010] The front mold base and the rear mold base are oppositely arranged; the fixed mold core part of the front mold core is a front fixed mold core part, and the fixed mold core part of the rear mold core is a rear fixed mold core part; the first end of the front fixed mold core part is arranged at the front mold base, and the first end of the rear fixed mold core part is arranged at the rear mold base; the second end of the front fixed mold core part is oppositely arranged with the second end of the rear fixed mold core part.

[0011] Beneficial effects: Different from the prior art, the plurality of contraction members are switched to the expansion state by sliding towards the side of the first end, so that the plurality of contraction members cooperate with the fixed mold core part to form the inner hole of the injection molded part. The first clamping structure is used to form the second clamping structure on the side wall of the inner hole. During the demolding process, the loosening step and the separation step can be continuously realized by moving the injection molded part, so that the smoothness of the demolding process can be improved, and the demolding efficiency can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 is a schematic view of an injection molded part;

[0013] Figure 2 is a schematic view of an injection molded part; Figure 1

[0014] Figure 3 is a schematic view of a mold core of the present application;

[0015] Figure 4 is an exploded schematic view of a mold core of the present application;

[0016] Figure 5 is a schematic view of an injection mold of the present application;

[0017] Figure 6 is an assembly schematic view of the front mold, the first inclined guide rod and the second inclined guide rod of the injection mold of the present application, Figure 6 obtained from the side of the front mold base towards the rear mold base;

[0018] Figure 7 is a schematic view of an injection molded part; Figure 6

[0019] Figure 8 is a schematic view of the rear mold of the injection mold of the present application;

[0020] Figure 9 is a schematic view of an injection molded part; Figure 8

[0021] Figure 10 is an assembly schematic view of the rear mold base, the second guide rail, the pressing block, the telescopic device, the movable plate, the rear mold core and the cover plate of the injection mold of the present application, Figure 10 obtained from the side of the rear mold base towards the front mold base;

[0022] ​​​Figure 11 is the assembly schematic diagram of the front mold core and the rear mold core of the injection mold of the present application after the mold closing;

[0023] Figure 12 is the schematic diagram of the front mold core of the injection mold of the present application;

[0024] Figure 13 is the schematic diagram of the rear mold core of the injection mold of the present application;

[0025] Figure 14 is the exploded schematic diagram of the first structure, the injection part and the second structure, the first structure is the structure left after the rear mold hides the first slider, the second slider, the first splicing block and the second splicing block, and the second structure is the assembly structure of the front mold core mounting plate and the front mold core; Figure 14 is the oblique view from the side of the rear mold base towards the front mold base;

[0026] Figure 15 is the schematic diagram of the rear shrinkage part of the injection mold of the present application;

[0027] Figure 16 is the assembly schematic diagram of the rear mold base, the second guide rail, the pressure holding block, the telescopic device, the movable plate, the rear mold core and the cover plate of the injection mold of the present application, Figure 16 is the oblique view from the side of the rear mold base away from the front mold base;

[0028] Figure 17 is the exploded schematic diagram of the third structure, the fourth structure and the cover plate of the injection mold of the present application, the third structure is the assembly structure of the movable plate and the rear mold core, and the fourth structure is the assembly structure of the rear mold base, the second guide rail, the pressure holding block and the telescopic device;

[0029] Figure 18 is the schematic diagram of the rear mold base of the injection mold of the present application, Figure 18 is the oblique view from the side of the rear mold base towards the front mold base;

[0030] Figure 19 is the schematic diagram of the rear mold base of the injection mold of the present application, Figure 19 is the oblique view from the side of the rear mold base away from the front mold base;

[0031] Figure 20 is Figure 19 is the enlarged schematic diagram of the middle region C;

[0032] Figure 21 is the exploded schematic diagram of the fifth structure and the front mold core of the injection mold of the present application, the fifth structure is the assembly structure of the front mold core mounting plate and the second front clamping part;

[0033] Figure 22 is the exploded schematic diagram of the second front clamping part, the front mold core and the front mold core mounting plate of the injection mold of the present application;

[0034] Figure 23 is an assembly schematic view of the first slider, the second slider, the first splice block and the second splice block of the injection mold of the present application;

[0035] Figure 24 is an enlarged schematic view of region B in Figure 10

[0036] Figure 25 is a schematic view of the first splice block of the injection mold of the present application, Figure 25 obtained from the side of the first splice block facing the second splice block;

[0037] Figure 26 is an enlarged schematic view of region D in Figure 25

[0038] Figure 27 is a schematic view of the second splice block of the injection mold of the present application, Figure 27 obtained from the side of the second splice block facing the first splice block;

[0039] Figure 28 is an enlarged schematic view of region E in Figure 27 BRIEF DESCRIPTION OF DRAWINGS

[0040]

[0041] injection part 10; inner hole 11; first inner hole 11a; second inner hole 11b; second clamping structure 12; second front clamping structure 12a; second rear clamping structure 12b; mold core 20; fixed mold core part 21; first end 21-1; second end 21-2; shrinkage 22; third end 22-1; fourth end 22-2; inclined guide part 23; inclined guide groove 23a; first clamping structure 24; first guide rail 25;

[0042] ​​​Injection mold 30; molding cavity 31; glue hole 32; first pipeline 33; glue head 34; placement hole 35; communication hole 36; front mold 100; front mold base 110; front mold core 120; first limiting structure 130; front movable slot 131; second front clamping portion 132; annular clamping piece 132a; front mold core mounting plate 140; front mold core mounting hole 141; first inclined guide rod 151; second inclined guide rod 152; rear mold 200; rear mold base 210; first storage slot 211; rear mold core mounting hole 212; second storage slot 213; first avoiding hole 214; second avoiding hole 215; rear mold core 220; telescopic device 230; movable plate 240; rear molding portion avoiding hole 241; second limiting structure 250; rear movable slot 251; first rear clamping portion 252; second rear clamping portion 253; rear cover plate 260; second guide rail 270; first splicing block 281; first molding groove 2811; first placement slot 2812; second splicing block 282; second molding groove 2821; second placement slot 2822; first sliding block 283; first inclined guide hole 2831; second sliding block 284; second inclined guide hole 2841; pressing block 285; front mold mounting plate 300; rear mold mounting plate 400; first guide column 600; second guide column 700;

[0043] Front fixed mold core portion 121; first plug-in structure 1211; front mounting portion 1212; front molding portion 1213; front contraction piece 122; third face portion 1221; fourth face portion 1222; fifth face portion 1223; front limiting piece 123; first front clamping structure 124; first end face 125; front inclined guide portion 126; rear fixed mold core portion 221; second plug-in structure 2211; rear mounting portion 2212; rear molding portion 2213; connection portion 2214; rear contraction piece 222; first face portion 2221; abutting portion 2222; second face portion 2223; rear limiting piece 223; first rear clamping structure 224; second end face 225; rear inclined guide portion 226. DETAILED DESCRIPTION

[0044] In order for those skilled in the art to better understand the technical solutions of the present application, the present application will be described in further detail below in combination with the drawings and specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor shall fall within the scope of protection of the present application.

[0045] It should be noted that the terms "first", "second", "third", "fourth", "fifth", "sixth" and the like in the embodiments of the application are used only for descriptive purposes and cannot be understood as indicating or implying relative importance or implying the number of the technical features indicated. Therefore, the features defined as "first", "second", "third", "fourth", "fifth", "sixth" and the like can be explicitly or implicitly included at least one of the features.

[0046] Please refer to Figures 1-4 The mold core 20 is used for forming the inner hole 11 of the injection molded part 10. Specifically, the injection molded part 10 is provided with the inner hole 11 and the second clamping structure 12. The second clamping structure 12 is arranged on the side wall of the inner hole 11. The mold core 20 includes a fixed mold core part 21 and a plurality of contraction pieces 22.

[0047] The fixed mold core part 21 has a first central axis. The fixed mold core part 21 has a first end 21-1 and a second end 21-2 along the extension direction of the first central axis. The side wall of the fixed mold core part 21 is provided with a plurality of inclined guide parts 23. The plurality of inclined guide parts 23 are distributed around the first central axis, and the inclined guide parts 23 are close to the first central axis from the first end 21-1 to the second end 21-2.

[0048] The first clamping structure 24 is arranged on the outer side wall close to the second end 21-2 of the contraction piece 22. The plurality of contraction pieces 22 are configured to slide along the plurality of inclined guide parts 23, so as to switch to an expanded state by sliding the plurality of contraction pieces 22 to the side toward the first end 21-1, and switch to a contracted state by sliding the plurality of contraction pieces 22 to the side toward the second end 21-2.

[0049] In the above manner, by switching to the expanded state by sliding the plurality of contraction pieces 22 to the side toward the first end 21-1, the plurality of contraction pieces 22 are used in cooperation with the fixed mold core part 21 to form the inner hole 11 of the injection molded part 10. The first clamping structure 24 is used to form the second clamping structure 12 on the side wall of the inner hole 11. During the demolding process, the loosening step and the separation step can be continuously realized by moving the injection molded part 10 to the side toward the second end 21-2 of the fixed mold core part 21, so as to improve the smoothness of the demolding process, thereby improving the demolding efficiency.

[0050] Specifically, in the loosening step, the injection molded part 10 is moved along the first central axis to the side toward which the second end 21-2 of the fixed mold core portion 21 faces, and the second end 21-2 of the fixed mold core portion 21 is driven to extend out of the fixed mold core portion 21 by the clamping and blocking cooperation of the first clamping structure 24 and the second clamping structure 12, so that the outer side walls of the plurality of contraction members 22 are close to the first central axis, to loosen the inner hole 11 of the injection molded part 10 and the second clamping structure 12. In the disengaging step, the loosened injection molded part 10 is continuously moved along the first central axis to the side toward which the second end 21-2 of the fixed mold core portion 21 faces, so that the injection molded part 10 is disengaged from the mold core 20.

[0051] It should be noted that in the loosening step, the mold core 20 loosens the inner hole 11 of the injection molded part 10, which can avoid or reduce the mutual extrusion between the mold core 20 and the inner hole 11 of the injection molded part 10 in the subsequent disengaging step. The mutual extrusion between the mold core 20 and the tubular inner wall of the injection molded part 10 is easy to cause the injection molded part 10 to break.

[0052] Optionally, in an example, the first clamping structure 24 can be a clamping groove, and the second clamping structure 12 can be a clamping block, but not limited thereto. In another example, the first clamping structure 24 can be a clamping block, and the second clamping structure 12 can be a clamping groove, but not limited thereto. Meanwhile, the number and arrangement position of the first clamping structure 24 can be adjusted according to actual conditions; in general, the number of the first clamping structure 24 should be as small as possible, and the arrangement position of the first clamping structure 24 should avoid the functional structure of the injection molded part 10 as much as possible, so as to avoid interference with the realization of the normal function of the injection molded part 10.

[0053] Optionally, the structure of the inclined guide portion 23 can be the structure shown in the following first example or second example.

[0054] In the first example, as shown in Figures 1-4 , the inclined guide portion 23 is an inclined guide groove 23a, and the bottom wall of the inclined guide groove 23a is close to the first central axis from the first end 21-1 to the second end 21-2. When the plurality of contraction members 22 are switched to the expanded state by sliding to the side toward which the first end 21-1 faces, the contraction members 22 retract into the fixed mold core portion 21 and are embedded in the inclined guide groove 23a, so that the plurality of contraction members 22 and the fixed mold core portion 21 cooperate to form the inner hole 11 of the injection molded part 10. In this way, the part of the contraction member 22 protruding from the surface of the fixed mold portion can be avoided or reduced, so that the side wall of the inner hole 11 formed by the cooperation of the plurality of strip-shaped portions and the fixed mold core portion 21 is more flat.

[0055] In the first example, the depth of the inclined guide groove 23a gradually increases from the first end 21-1 to the second end 21-2, so that the bottom wall of the inclined guide groove 23a approaches the first central axis from the first end 21-1 to the second end 21-2.

[0056] Wherein, when the shrinkage members 22 are retracted into the fixed mold core part 21 and embedded in the inclined guide groove 23a, the plurality of shrinkage members 22 and the fixed mold core part 21 cooperatively form a columnar structure, so that the inner hole 11 of the injection molded part 10 is formed as a columnar inner hole 11.

[0057] In the above manner, in the first example, the columnar structure can include one or more of a cylindrical shape, a columnar shape, and a prism shape.

[0058] In the first example, the first guide rail 25 is arranged in the inclined guide groove 23a, and the shrinkage member 22 is slidingly arranged in the first guide rail 25. In this way, the first guide rail 25 and the shrinkage member 22 are slidingly connected, so that the shrinkage member 22 is not easily separated from the first guide rail 25 at the opening end of the inclined guide groove 23a when the shrinkage member 22 slides along the first guide rail 25.

[0059] It should be noted that in other examples, the inclined guide groove 23a and the shrinkage member 22 can be slidingly connected, so that the shrinkage member 22 is not easily separated from the first guide rail 25 at the opening end of the inclined guide groove 23a.

[0060] In the second example, as shown in Figures 1-4 , the inclined guide groove 23a can not be provided, the inclined guide part 23 is a third guide rail, and the fixed mold core part 21 is wedge-shaped, so that the third guide rail approaches the first central axis from the first end 21-1 to the second end 21-2.

[0061] For ease of illustration, in subsequent examples, the structure of the inclined guide part 23 is taken as an example of the structure shown in the first example unless otherwise specified. However, it should be understood that in subsequent examples, the inclined guide part 23 can also adopt the structure shown in the second example.

[0062] In combination with Figures 1-4 , referring to Figures 5-13 , the injection mold 30 of the present application includes a mold base (not labeled in the figure) and a mold core 20, the mold core 20 being the mold core 20 described above, and the first end 21-1 of the mold core 20 being arranged in the mold base. In this way, when the injection molded part 10 is moved to the side toward which the second end 21-2 of the fixed mold core part 21 is directed, the injection molded part 10 can drive the shrinkage members 22 to extend out of the second end 21-2 of the fixed mold core part 21, so that the outer side walls of the plurality of shrinkage members 22 approach the first central axis, thereby releasing the inner hole 11 of the injection molded part 10 and the second clamping structure 12.

[0063] Optionally, in combination with Figures 1-4 , referring to Figures 5-13At least one of the mold seats is formed as the front mold seat 110, at least one of the mold cores 20 is formed as the front mold core 120, at least one of the mold seats is formed as the rear mold seat 210, and at least one of the mold cores 20 is formed as the rear mold core 220. At least the front mold seat 110 and the front mold core 120 form the front mold 100. At least the rear mold seat 210 and the rear mold core 220 form the rear mold 200.

[0064] The front mold seat 110 is arranged opposite to the rear mold seat 210. The fixed mold core part 21 of the front mold core 120 is a front fixed mold core part 121, and the fixed mold core part 21 of the rear mold core 220 is a rear fixed mold core part 221. The first end 21-1 of the front fixed mold core part 121 is arranged on the front mold seat 110, and the first end 21-1 of the rear fixed mold core part 221 is arranged on the rear mold seat 210. The second end 21-2 of the front fixed mold core part 121 is arranged opposite to the second end 21-2 of the rear fixed mold core part 221.

[0065] It should be noted that, in the above manner, when the mold is closed, the front mold core 120 forms the inner hole 11 of the injection molded part 10 at the end of the front mold core 120, and the rear mold core 220 forms the inner hole 11 of the injection molded part 10 at the end of the rear mold core 220. When the mold is opened, the front mold seat 110 and the rear mold seat 210 are arranged opposite to each other and away from each other, so as to drive the front mold core 120 and the rear mold core 220 to be arranged opposite to each other and away from each other, so that a distance between the front mold core 120 and the rear mold core 220 is sufficient for the injection molded part 10 to be removed. Thus, the injection molded part 10 can be separated from the front mold core 120 and the rear mold core 220.

[0066] In combination Figures 1-4 In combination Figures 5-13 The contraction part 22 has a third end 22-1 and a fourth end 22-2 along the extension direction of the first central axis. In the expanded state, the third end 22-1 is close to the first end 21-1, and the fourth end 22-2 is close to the second end 21-2. The contraction part 22 of the front mold core 120 is a front contraction part 122, and the contraction part 22 of the rear mold core 220 is a rear contraction part 222. The inner hole 11 formed by the front mold core 120 is a first inner hole 11a, and the inner hole 11 formed by the rear mold core 220 is a second inner hole 11b. Then, the structure of the final injection molded part 10 can be as shown in the following third example or fourth example, but is not limited thereto.

[0067] In the third example, after the mold is closed, the end face of the second end 21-2 of the front fixed mold core part 121 and the end face of the fourth end 22-2 of the plurality of front contraction parts 122 combine to form a first end face 125, and the second end 21-2 of the rear fixed mold core part 221 and the fourth end 22-2 of the plurality of rear contraction parts 222 combine to form a second end face 225. The first end face 125 and the second end face 225 abut. In this way, the first inner hole 11a formed by the front mold core 120 and the second inner hole 11b formed by the rear mold core 220 are in communication.

[0068] In the fourth example, after the mold is closed, the second end 21-2 of the front fixed mold core part 121 and the fourth end 22-2 of the plurality of front contraction parts 122 combine to form a first end face 125, and the second end 21-2 of the rear fixed mold core part 221 and the fourth end 22-2 of the plurality of rear contraction parts 222 combine to form a second end face 225. The first end face 125 is arranged at a distance from the second end face 225. In this way, the first inner hole 11a formed by the front mold core 120 is separated from the second inner hole 11b formed by the rear mold core 220.

[0069] For ease of illustration, in subsequent examples, the combination of the front mold core 120 and the rear mold core 220 after the mold is closed is described according to the third example.

[0070] Optionally, in combination with Figures 1-4 , see Figures 5-13 The second end 21-2 of the front fixed mold core part 121 is provided with a first plug-in structure 1211, and the second end 21-2 of the rear fixed mold core part 221 is provided with a second plug-in structure 2211. After the front mold 100 and the rear mold 200 are closed, the first plug-in structure 1211 and the second plug-in structure 2211 are plug-in matched. In this way, after the mold is closed, the plug-in matching of the first plug-in structure 1211 and the second plug-in structure 2211 can make the first central axis of the front mold core 120 and the first central axis of the rear mold core 220 more accurate and the relative position more stable, so as to make the shapes of the first inner hole 11a and the second inner hole 11b formed in different batches stable.

[0071] Optionally, in combination with Figures 1-4 , see Figures 5-13 The front mold seat 110 and the rear mold seat 210 are configured to be relatively movable to drive the front mold core 120 and the rear mold core 220 to relatively approach or relatively move away. The relative approach of the front mold core 120 and the rear mold core 220 makes the front mold core 120 and the rear mold core 220 sequentially switch from the self-disengagement interference to the first interference and the second interference.

[0072] Wherein, the disengagement interference includes that the front mold core 120 and the rear mold core 220 are arranged at a distance. The first interference includes that the front contraction part 122 interferes with the rear mold core 220, and the rear contraction part 222 interferes with the front mold core 120, and the front fixed mold core part 121 and the rear fixed mold core part 221 are arranged at a distance. The second interference includes that the front contraction part 122 interferes with the rear mold core 220, and the rear contraction part 222 interferes with the front mold core 120, and the front fixed mold core part 121 and the rear fixed mold core part 221 interfere.

[0073] In this manner, when the front mold core 120 and the rear mold core 220 switch from the first contact to the second contact, the contact between the front shrink member 122 and the rear mold core 220 causes the front shrink member 122 to retract into the front fixed mold core portion 121, and the contact between the rear shrink member 222 and the front mold core 120 causes the rear shrink member 222 to retract into the fixed mold core portion 21. Thus, the front shrink member 122 and the rear shrink member 222 can adaptively retract into their respective fixed mold core portions 21 as the front mold base 110 and the rear mold base 210 approach each other.

[0074] It should be noted that when mold closing is required, the front mold base 110 and the rear mold base 210 move closer together, causing the front mold core 120 and the rear mold core 220 to move closer together, switching the front mold core 120 and the rear mold core 220 to a second contact position. At this time, the front mold core 120 can be used to form the first inner hole 11a, and the rear mold core 220 can be used to form the second inner hole 11b. When mold opening is required, the front mold base 110 and the rear mold base 210 move further apart, causing the front mold core 120 and the rear mold core 220 to move further apart, forming a sufficient distance between the front mold core 120 and the rear mold core 220 to remove the injection molded part 10.

[0075] Optionally, the relative arrangement of the front mold core 120 and the rear mold core 220 can be as shown in the fifth to sixth examples below, but is not limited thereto.

[0076] Fifth example, combined Figures 1-4 See Figures 5-13 The front shrinking member 122 and the rear shrinking member 222 are arranged opposite to each other, and the front fixed mold core portion 121 and the rear fixed mold core portion 221 are arranged opposite to each other. Thus, when the front mold core 120 and the rear mold core 220 switch from the first contact to the second contact, the contact between the front shrinking member 122 and the rear shrinking member 222 causes the front shrinking member 122 to retract into the front fixed mold core portion 121 and the rear shrinking member 222 to retract into the rear fixed mold core portion 221.

[0077] Sixth example, combined Figures 1-4 See Figures 5-13 The front shrinking member 122 is disposed opposite to a portion of the rear fixed mold core 221, the rear shrinking member 222 is disposed opposite to a portion of the front fixed mold core 121, and another portion of the front fixed mold core 121 is disposed opposite to another portion of the rear fixed mold core 221. Thus, when the front mold core 120 and the rear mold core 220 switch from a first contact to a second contact, the contact between the front shrinking member 122 and the rear fixed mold core 221 causes the front shrinking member 122 to retract into the front fixed mold core 121, and the contact between the rear shrinking member 222 and the front fixed mold core 121 causes the rear shrinking member 222 to retract into the rear fixed mold core 221.

[0078] For ease of illustration, in the following embodiments, the relative position relationship between the front mold core 120 and the rear mold core 220 is described based on the fifth example.

[0079] Optionally, in combination with Figure 5 , referring to Figure 6 , the rear fixed mold core part 221 sequentially includes a rear mounting part 2212 and a rear forming part 2213 from the first end 21-1 to the second end 21-2. The rear mounting part 2212 is arranged on the rear mold seat 210. The inclined guide part 23 of the rear mold core 220 is a rear inclined guide part 226, which respectively extends to the rear mounting part 2212 and the rear forming part 2213.

[0080] In the above manner, after the mold is closed, the rear forming part 2213 cooperates with the rear shrinkage part 222 to form the second inner hole 11b. Optionally, the cross section of the rear mounting part 2212 can be larger than the cross section of the rear forming part 2213, but is not limited thereto.

[0081] Optionally, in combination with Figure 7 , Figure 9 , Figure 10 , Figures 11-13 , referring to Figure 17 , Figures 1-4 and Figure 6 , the rear mold 200 includes a telescopic device 230 and a movable plate 240. The telescopic device 230 is arranged on the rear mold seat 210, and the movable plate 240 is arranged on the telescopic device 230. The movable plate 240 is located on the side of the rear mold seat 210 facing the front mold seat 110 and is provided with a rear forming part avoiding hole 241. The rear forming part avoiding hole 241 is used to avoid the rear forming part 2213, so that the telescopic device 230 can drive the movable plate 240 to switch between the first position and the second position relative to the rear forming part 2213. The first position is closer to the front mold 100 than the second position.

[0082] When the movable plate 240 is switched from the first position to the second position, the movable plate 240 abuts against the injection molded part 10 to drive the rear shrinkage part 222 to extend out of the second end 21-2 of the rear fixed mold core 20 through the injection molded part 10. When the movable plate 240 is switched from the second position to the first position, the movable plate 240 abuts against the rear shrinkage part 222 to drive the rear shrinkage part 222 to retract into the rear fixed mold core part 221 through the movable plate 240.

[0083] In the above manner, when the front mold seat 110 and the rear mold seat 210 are relatively far away, the front mold core 120 and the rear mold core 220 are relatively far away, the front demolding step and the rear demolding step can be sequentially performed, so that the injection molded part 10 is more quickly separated from the injection mold 30, thereby improving the demolding efficiency.

[0084] The front demolding step includes moving the injection molded part 10 with the rear mold core 220 when the movable plate 240 is in the first position, so that the injection molded part 10 sequentially realizes the loosening step and the disengaging step, and the injection molded part 10 is disengaged from the front mold core 120. The rear demolding step includes switching the movable plate 240 from the first position to the second position by the telescopic device 230, so that the injection molded part 10 sequentially realizes the loosening step and the disengaging step, and the injection molded part 10 is disengaged from the rear mold core 220.

[0085] The first clamping structure 24 provided on the front retraction member 122 is a first front clamping structure 124, and the first clamping structure 24 provided on the rear retraction member 222 is a first rear clamping structure 224. The second clamping structure 12 formed by the first front clamping structure 124 is a second front clamping structure 12a, and the second clamping structure 12 formed by the first rear clamping structure 224 is a second rear clamping structure 12b.

[0086] Therefore, in the loosening step of the front demolding step, the front retraction member 122 is driven to extend out of the second end 21-2 of the front fixed mold core part 121 by the clamping and blocking cooperation between the first front clamping structure 124 and the second front clamping structure 12a. In the loosening step of the rear demolding step, the rear retraction member 222 is driven to extend out of the second end 21-2 of the rear fixed mold core part 221 by the clamping and blocking cooperation between the first rear clamping structure 224 and the second rear clamping structure 12b.

[0087] Optionally, in combination with Figure 7 , Figure 9 , Figure 10 , Figure 11 , referring to Figure 13 , Figure 15 , Figure 17 , Figure 10 and Figure 13 , the rear fixed mold core part 221 includes a linking part 2214 provided between the rear mounting part 2212 and the rear forming part 2213. The side of the rear retraction member 222 away from the rear fixed mold core part 221 sequentially includes a first face part 2221, an abutting part 2222 and a second face part 2223 from the third end 22-1 to the fourth end 22-2. The first face part 2221 protrudes from the second face part 2223.

[0088] Wherein, when the rear retraction member 222 retracts into the rear fixed mold core part 221, the part of the rear retraction member 222 provided with the first face part 2221 is located in the rear mounting part 2212, the part of the rear retraction member 222 provided with the abutting part 2222 is located in the linking part 2214, and the part of the rear retraction member 222 provided with the second face part 2223 is located in the rear forming part 2213. In this way, after the mold is closed, the rear forming part 2213 cooperates with the part of the rear retraction member 222 provided with the second face part 2223 for forming the second inner hole 11b.

[0089] Optionally, asFigure 15 、 Figure 17 、 Figures 3-5 and Figure 10 As shown in

[0090] By way of example and not limitation, the side wall of the rear forming portion avoiding hole 241 is obliquely arranged relative to the first central axis of the rear fixed mold core portion 221, and the connecting portion 2214 is obliquely arranged relative to the first central axis of the rear fixed mold core portion 221, so that the side wall of the rear forming portion avoiding hole 241 is in abutment with the abutted portion 2222 when the movable plate 240 is switched from the second position to the first position.

[0091] Optionally, as shown in Figure 13 、 Figures 15-17 、 Figure 19 、 Figure 20 、 Figures 3-5 and Figure 10 The third end 22-1 of the rear shrinkage member 222 is provided with a rear limiting member 223, which is protrudingly arranged on the side of the rear shrinkage member 222 away from the rear fixed mold core portion 221. The rear mold seat 210 is provided with a second limiting structure 250. The rear limiting member 223 is used to cooperate with the second limiting structure 250 to limit the movement stroke of the rear shrinkage member 222 relative to the rear fixed mold core portion 221. In this way, when the rear shrinkage member 222 extends out of the second end 21-2 of the rear fixed mold core portion 221, it can be prevented from being completely pulled out of the fixed portion of the rear mold core 220 from the second end 21-2 of the rear fixed mold core portion 221. And when the rear shrinkage member 222 retracts into the rear fixed mold core portion 221, it can be prevented from being completely pulled out of the rear fixed mold core portion 221 from the first end 21-1 of the rear fixed mold core portion 221.

[0092] Optionally, as shown in Figure 13 、 Figures 15-17 、 Figure 19 、 Figure 20 、 Figure 5 and Figure 10 The side of the rear mold seat 210 facing the front mold seat 110 is provided with a first receiving groove 211, and the movable plate 240 is accommodated in the first receiving groove 211 when the rear shrinkage member 222 retracts into the rear fixed mold core portion 221. The bottom wall of the first receiving groove 211 is provided with a rear mold core mounting hole 212, and the rear mounting portion 2212 is mounted in the rear mold core mounting hole 212. The second limiting structure 250 includes a rear movable slot 251, a first rear clamping portion 252, and a second rear clamping portion 253.

[0093] The rear movable slot 251 is arranged on the sidewall of the rear mold core mounting hole 212 corresponding to the rear limiting member 223 movably arranged in the rear movable slot 251. The first rear clamping portion 252 is arranged on one side of the rear movable slot 251 away from the front mold base 110. The second rear clamping portion 253 is arranged on one side of the rear movable slot 251 toward the front mold base 110.

[0094] The rear limiting member 223 is clamped with the first rear clamping portion 252 to make the end face of the fourth end 22-2 of the rear retractable member 222 flush with the second end face 225 of the second end 21-2 of the rear fixed mold core part 221 when the rear retractable member 222 is retracted to fix the mold core part 221. The rear limiting member 223 is clamped with the second rear clamping portion 253 to avoid the third end 22-1 of the rear retractable member 222 from being separated from the rear fixed mold core part 221 when the rear retractable member 222 is extended to fix the second end 21-2 of the rear fixed mold core part 221.

[0095] Optionally, as shown in Figure 13 、 Figures 15-17 、 Figure 19 、 Figure 20 、 Figure 8 and Figure 9 , the rear mold 200 comprises a rear cover plate 260, and the rear mold base 210 corresponding to the first receiving slot 211 is provided with a second receiving slot 213 away from the front mold base 110. The rear cover plate 260 is arranged on the second receiving slot 213. The first rear clamping portion 252 can cover part of the rear movable slot 251 of the rear cover plate 260, and the second rear clamping portion 253 can be a protrusion arranged at one end of the rear movable slot 251 close to the front mold base 110, but is not limited thereto.

[0096] Optionally, as shown in Figure 10 、 Figure 14 、 Figure 16 、 Figure 17 、 Figures 1-5 and Figure 12 , the rear mold 200 comprises a second guide column 700 arranged on the rear cover plate 260 and penetrating through the rear mold base 210 and the movable plate 240. The movable plate 240 is movable along the second guide column 700 to switch between the first position and the second position.

[0097] Optionally, as shown in Figures 1-5 and Figure 12 , the front fixed mold core part 121 comprises a front mounting part 1212 and a front forming part 1213 in sequence from the first end 21-1 to the second end 21-2. The front mounting part 1212 is arranged on the front mold base 110. The inclined guide part 23 of the front mold core 120 is the front inclined guide part 126, and the front inclined guide part 126 extends to the front mounting part 1212 and the front forming part 1213, respectively.

[0098] In the above manner, after the mold is closed, the front forming portion 1213 cooperates with the front contraction member 122 for forming the first inner hole 11a. Alternatively, the cross-sectional area of the front mounting portion 1212 can be greater than that of the front forming portion 1213, but is not limited thereto.

[0099] Alternatively, as shown in Figures 1-7 and Figure 12 , the front contraction member 122 comprises, in order from the third end 22-1 to the fourth end 22-2 of the side away from the front fixed mold core portion 121, a third face portion 1221, a fourth face portion 1222, and a fifth face portion 1223, the third face portion 1221 protrudes from the fifth face portion 1223, and the fourth face portion 1222 connects the third face portion 1221 and the fifth face portion 1223, respectively.

[0100] In the above manner, after the mold is closed, the front forming portion 1213 cooperates with the front contraction member 122 for forming the first inner hole 11a. Alternatively, the cross-sectional area of the front mounting portion 1212 can be greater than that of the front forming portion 1213, but is not limited thereto.

[0101] Alternatively, as shown in Figure 14 , Figure 21 , Figure 22 , Figures 1-7 and Figure 12 , the third end 22-1 of the front contraction member 122 is provided with a front limiting member 123, and the front limiting member 123 is protrudingly arranged on the side of the front contraction member 122 away from the front fixed mold core portion 121. The front mold seat 110 is provided with a first limiting structure 130. The front limiting member 123 is used to cooperate with the first limiting structure 130 to limit the movement stroke of the front contraction member 122 relative to the front fixed mold core portion 121. In this way, when the front contraction member 122 protrudes from the second end 21-2 of the front fixed mold core portion 121, the front contraction member 122 can be prevented from being completely removed from the front fixed mold core portion 121 at the second end 21-2 of the front fixed mold core portion 121. And when the front contraction member 122 is retracted into the front fixed mold core portion 121, the front contraction member 122 can be prevented from being completely removed from the front fixed mold core portion 121 at the first end 21-1 of the front fixed mold core portion 121.

[0102] Alternatively, as shown in Figure 14 , Figure 21 , Figure 22 , Figure 5 and Figures 6-7As shown, the front mold base 110 is provided with a front mold core mounting plate 140, the front mold core mounting plate 140 is provided with a front mold core mounting hole 141, and the front mounting portion 1212 is mounted in the front mold core mounting hole 141. The first limiting structure 130 includes a front movable slot 131, a first front clamping portion (not marked in the figure), and a second front clamping portion 132.

[0103] The front movable slot 131 is arranged on the side wall of the front mold core mounting hole 141 corresponding to the front limiting piece 123, and the front limiting piece 123 is movably arranged in the front movable slot 131. The first front clamping portion is arranged on one side of the front movable slot 131 away from the rear mold base 210. The second front clamping portion 132 is arranged on one side of the front movable slot 131 towards the rear mold base 210.

[0104] The front limiting piece 123 is clamped and matched with the first front clamping portion, so that when the front retracting piece 122 retracts the second end 21-2 of the front fixed mold core portion 121, the end face of the fourth end 22-2 of the front retracting piece 122 is flush with the end face of the second end 21-2 of the front fixed mold core portion 121 to form a first end face 125. The front limiting piece 123 is clamped and matched with the second front clamping portion 132, so that when the front retracting piece 122 extends the second end 21-2 of the front fixed mold core portion 121, the third end 22-1 of the front retracting piece 122 is prevented from being separated from the front fixed mold core portion 121.

[0105] Optionally, the first front clamping portion can be the inner wall of the front mold base 110, and the second front clamping portion 132 corresponding to the plurality of movable slots can be integrally connected to form a ring-shaped clamping piece 132a, but is not limited thereto.

[0106] Optionally, as shown in Figure 9 、 Figure 10 、 Figure 14 、 Figures 23-28 、 Figure 5 、 Figures 6-7 As shown, the side of the rear mold base 210 towards the front mold base 110 is slidably provided with a first sliding block 283 and a second sliding block 284, the first sliding block 283 is connected with a first splicing block 281, and the second sliding block 284 is connected with a second splicing block 282. The first splicing block 281 is provided with a first forming groove 2811, and the second splicing block 282 is provided with a second forming groove 2821.

[0107] The injection mold 30 includes a first inclined guide rod 151 and a second inclined guide rod 152, one end of the first inclined guide rod 151 and one end of the second inclined guide rod 152 are fixed to the front mold base 110. The first inclined guide rod 151 and the second inclined guide rod 152 extend in directions away from each other from one end close to the front mold base 110 to one end close to the rear mold base 210.

[0108] The first slider 283 is in sliding fit with the first inclined guide rod 151, and the second slider 284 is in sliding fit with the second inclined guide rod 152, so that when the front mold base 110 and the rear mold base 210 are relatively close to each other, the first slider 283 and the second slider 284 are driven to be relatively close to each other by the first inclined guide rod 151 and the second inclined guide rod 152, so that the first forming groove 2811 and the second forming groove 2821 are enclosed to form the forming cavity 31. When the front mold base 110 and the rear mold base 210 are relatively close to each other, the front mold base 110 and the rear mold base 210 drive the front mold core 120 and the rear mold core 220 to be relatively close to each other, so that the front mold core 120 and the rear mold core 220 can respectively extend into the forming cavity 31 when the forming cavity 31 is enclosed.

[0109] In the above manner, by driving the front mold base 110 and the rear mold base 210 to be relatively close to each other, the first forming groove 2811 and the second forming groove 2821 can be enclosed to form the forming cavity 31, and the front mold core 120 and the rear mold core 220 can be relatively close to each other to respectively extend into the forming cavity 31. By driving the front mold base 110 and the rear mold base 210 to be relatively far away from each other, the first forming groove 2811 and the second forming groove 2821 can be separated, and the front mold core 120 and the rear mold core 220 can be separated.

[0110] Optionally, as shown in Figure 9 、 Figure 10 、 Figure 14 、 Figures 23-28 、 Figure 5 、 Figures 6-7 , the side of the rear mold base 210 facing the front mold base 110 is provided with a second guide rail 270, and the second guide rail 270 is arranged on both sides of the first receiving groove 211. The first slider 283 and the second slider 284 are respectively arranged in sliding fit with the second guide rail 270. In this way, when the front mold base 110 and the rear mold base 210 are relatively close to each other, the first slider 283 and the second slider 284 can be driven to be relatively close to each other along the second guide rail 270 by the first inclined guide rod 151 and the second inclined guide rod 152.

[0111] Optionally, as shown in Figure 9 、 Figure 10 、 Figure 14 、 Figures 23-28 、 Figure 5 、 Figures 6-7 , the side of the rear mold base 210 facing the front mold base 110 is provided with a pressing block 285, and the pressing block 285 is arranged on both sides of the first receiving groove 211. The first slider 283 and the second slider 284 are respectively pressed on the rear mold base 210 by the pressing block 285, so that when the first slider 283 and the second slider 284 slide along the second guide rail 270, the first slider 283 and the second slider 284 are not easy to be separated from the rear mold base 210 along the side of the rear mold base 210 facing the front mold base 110.

[0112] Optionally, as shown in Figure 9 , Figure 10 , Figure 14 , Figure 18 , Figures 23-28 , Figure 5 The first slider 283 is provided with a first inclined guide hole 2831 which is in sliding fit with the first inclined guide rod 151. The second slider 284 is provided with a second inclined guide hole 2841 which is in sliding fit with the second inclined guide rod 152, but not limited thereto. In this way, by the sliding fit of the first inclined guide hole 2831 with the first inclined guide rod 151 and the sliding fit of the second inclined guide hole 2841 with the second inclined guide rod 152, the first slider 283 and the second slider 284 are driven to be relatively close to each other by the first inclined guide rod 151 and the second inclined guide rod 152 when the front mold base 110 and the rear mold base 210 are relatively close to each other.

[0113] Optionally, as shown in Figure 6 , Figure 14 , Figure 5 , Figure 6 , Figure 14 , Figures 5-9 , Figure 23 The rear mold base 210 is provided with a first avoiding hole 214 and a second avoiding hole 215. The first avoiding hole 214 and the second avoiding hole 215 are respectively located on both sides of the first receiving groove 211. After the mold is closed, the end of the first inclined guide rod 151 close to the rear mold base 210 extends into the first avoiding hole 214, and the end of the second inclined guide rod 152 close to the rear mold base 210 extends into the second avoiding hole 215. In this way, the assembly of each component structure of the injection mold 10 can be more compact, which is beneficial to realize the miniaturization of the injection mold 10.

[0114] Optionally, as shown in Figures 25-28 , Figures 5-9 and Figure 23 The injection mold 30 comprises a front mold mounting plate 300 and a rear mold mounting plate 400; the front mold mounting plate 300 is arranged on the side of the front mold base 110 away from the rear mold base 210, and the rear mold mounting plate 400 is arranged on the side of the rear mold base 210 away from the front mold base 110.

[0115] As shown in Figures 25-28 , ​ and ​ The injection mold 30 comprises a plurality of first guide columns 600, and the front mold mounting plate 300, the front mold base 110, the rear mold base 210 and the rear mold mounting plate 400 are guided and matched by the plurality of first guide columns 600.

[0116] When the front mold seat 110 and the rear mold seat 210 are relatively far away from each other, the front mold mounting plate 300 can be relatively far away from the rear mold seat 210 together with the front mold seat 110, and the rear mold mounting plate 400 can be relatively far away from the front mold seat 110 together with the rear mold seat 210.

[0117] It should be noted that after the rear mold mounting plate 400 is relatively far away from the front mold seat 110 together with the rear mold seat 210, the rear mold mounting plate 400 can also be moved relative to the rear mold seat 210 to be far away from the rear mold seat 210.

[0118] The technical content of how the rear mold mounting plate 400 is far away from the rear mold seat 210 can be referred to the description in the prior art, which will not be repeated here.

[0119] Optionally, as shown in ​ 、 ​ 、 ​ The front mold mounting plate 300 is provided with a glue injection hole 32, and the injection mold 30 is provided with a communication pipeline and a communication hole 36. One end of the communication pipeline communicates with the glue injection hole 32, and the other end of the communication pipeline penetrates through the front mold seat 110 and the front mold core mounting plate 140 to protrude from the side of the front mold core mounting plate 140 away from the front mold seat 110. The part of the communication pipeline protruding from the side of the front mold core mounting plate 140 away from the front mold seat 110 is a first pipeline 33, and the first pipeline 33 is provided with a glue injection head 34.

[0120] The first splicing block 281 is provided with a first placing groove 2812. One end of the first placing groove 2812 communicates with the side of the first splicing block 281 facing the front mold seat 110. The second splicing block 282 is provided with a second placing groove 2822 and a second communication hole 36. One end of the second placing groove 2822 communicates with the side of the second splicing block 282 facing the front mold seat 110. The communication hole 36 is arranged on the first splicing block 281 and / or the second splicing block 282.

[0121] When the first forming groove 2811 and the second forming groove 2821 are enclosed to form the forming cavity 31, the first placing groove 2812 and the second placing groove 2822 form a placing hole 35, and the communication hole 36 communicates the forming cavity 31 and the placing hole 35. When the front mold seat 110 and the rear mold seat 210 are relatively close to each other, the front mold seat 110 drives the first pipeline 33 to be close to the rear mold seat 210, so that when the first pipeline 33 is arranged in the placing hole 35 and the glue injection head 34 communicates with the forming cavity 31 through the communication hole 36, the first pipeline 33 is arranged in the placing hole 35 and the glue injection head 34 communicates with the forming cavity 31 through the communication hole 36.

[0122] Optionally, as shown in ​ 、 ​ 、 ​As shown, in the injection mold 30, the front mold core 120 and the rear mold core 220 have multiple groups, each group of the front mold core 120 has a corresponding molding cavity 31. One of the two adjacent molding cavities 31 is taken as a first molding cavity, and the other one is taken as a second molding cavity. Then the placement hole 35 is arranged between the first molding cavity and the second molding cavity, and the first pipeline 33 is communicated with the first molding cavity and the second molding cavity through the glue injection head 34 respectively.

[0123] The above is only an embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation using the content of the specification and drawings, or direct or indirect application in other related technical fields, is also included in the patent protection scope of the present application.

Claims

1. A mold core, characterized by, The mold core comprises: a fixed mold core portion having a first central axis; the fixed mold core portion has a first end and a second end along the extension direction of the first central axis; the side wall of the fixed mold core portion is provided with a plurality of inclined guide portions; the plurality of inclined guide portions are distributed around the first central axis, and the inclined guide portions are close to the first central axis from the first end to the second end; and a plurality of contraction members, the first clamping structure is arranged on the outer side wall close to the second end of the contraction member; the plurality of contraction members are configured to slide along the plurality of inclined guide portions, so as to switch to an expanded state by sliding the plurality of contraction members to one side facing the first end, and switch to a contracted state by sliding the plurality of contraction members to one side facing the second end.

2. The mold core of claim 1, wherein In the expanded state, the plurality of contraction members cooperate with the fixed mold core portion to form an inner hole of an injection molded part, and the first clamping structure is used to form a second clamping structure on the side wall of the inner hole, so that the first clamping structure and the second clamping structure can be clamped and matched; wherein when moving the injection molded part to one side facing the second end of the fixed mold core portion, the injection molded part can drive the contraction member to extend out of the second end of the fixed mold core portion, so that the outer side wall of the plurality of contraction members is close to the first central axis, so as to loosen the inner hole of the injection molded part and the second clamping structure.

3. The core of claim 1 wherein, The inclined guide portion is an inclined guide groove, and the bottom wall of the inclined guide groove is close to the first central axis from the first end to the second end; wherein when the plurality of contraction members slide to one side facing the first end to switch to an expanded state, the contraction member retracts into the fixed mold core portion and is embedded in the inclined guide groove, so that the plurality of contraction members and the fixed mold core portion cooperate to form an inner hole of an injection molded part.

4. An injection mold characterized by, The injection mold comprises a mold base and a mold core, the mold core is the mold core of any one of claims 1-2, and the first end of the mold core is arranged in the mold base.

5. The injection mold of claim 4, wherein, At least one of the mold bases is formed as a front mold base, at least one of the mold cores is formed as a front mold core, at least one of the mold bases is formed as a rear mold base, and at least one of the mold cores is formed as a rear mold core; at least the front mold base and the front mold core constitute a front mold; at least the rear mold base and the rear mold core constitute a rear mold; The front mold base and the rear mold base are arranged opposite to each other; the fixed mold core portion of the front mold core is a front fixed mold core portion, and the fixed mold core portion of the rear mold core is a rear fixed mold core portion; the first end of the front fixed mold core portion is arranged in the front mold base, and the first end of the rear fixed mold core portion is arranged in the rear mold base; the second end of the front fixed mold core portion is arranged opposite to the second end of the rear fixed mold core portion.

6. The injection mold of claim 5, wherein, The contraction member of the front mold core is a front contraction member, and the contraction member of the rear mold core is a rear contraction member; The front mold base and the rear mold base are configured to be relatively movable to relatively close or relatively away from the front mold core and the rear mold core; relatively close of the front mold core and the rear mold core makes the front mold core and the rear mold core switch from disengaged contact to first contact and second contact in sequence; The disengagement includes that the front mold core is spaced apart from the rear mold core; the first interference includes that the front contraction member interferes with the rear mold core, and the rear contraction member interferes with the front mold core, and the front fixed mold core part is spaced apart from the rear fixed mold core part; the second interference includes that the front contraction member interferes with the rear mold core, and the rear contraction member interferes with the front mold core, and the front fixed mold core part interferes with the rear fixed mold core part.

7. The injection mold of claim 6, wherein, the rear fixed mold core part comprises a rear mounting part and a rear forming part in sequence from the first end to the second end; the rear mounting part is arranged on the rear mold base; the inclined guide part of the rear mold core is a rear inclined guide part, and the rear inclined guide part extends to the rear mounting part and the rear forming part respectively; the rear mold comprises a telescopic device and a movable plate; the telescopic device is arranged on the rear mold base, and the movable plate is arranged on the telescopic device; the movable plate is located on the side of the rear mold base facing the front mold base and is provided with a rear forming part avoiding hole; the rear forming part avoiding hole is used for avoiding the rear forming part, so that the telescopic device can drive the movable plate to switch between a first position and a second position relative to the rear forming part; the first position is closer to the front mold than the second position; when the movable plate is switched from the first position to the second position, the movable plate abuts against the injection part to drive the rear contraction member to extend out of the second end of the rear fixed mold core through the injection part; when the movable plate is switched from the second position to the first position, the movable plate abuts against the rear contraction member to drive the rear contraction member to retract into the rear fixed mold core part through the movable plate.

8. The injection mold of claim 7, wherein, the contraction member has a third end and a fourth end in the extension direction of the first central axis; in the expanded state, the third end is close to the first end, and the fourth end is close to the second end; the rear fixed mold core part comprises a connecting part arranged between the rear mounting part and the rear forming part; the side of the rear contraction member away from the rear fixed mold core part comprises a first surface part, an interference part and a second surface part in sequence from the third end to the fourth end; the first surface part protrudes from the second surface part; wherein, when the rear contraction member retracts into the rear fixed mold core part, the part of the rear contraction member provided with the first surface part is located in the rear mounting part, the part of the rear contraction member provided with the interference part is located in the connecting part, and the part of the rear contraction member provided with the second surface part is located in the rear forming part; when the movable plate is switched from the second position to the first position, the side wall of the rear forming part avoiding hole abuts against the interference part.

9. The injection mold of claim 5, wherein, the contraction member has a third end and a fourth end in the extension direction of the first central axis; in the expanded state, the third end is close to the first end, and the fourth end is close to the second end; the contraction member of the front mold core is a front contraction member, and the contraction member of the rear mold core is a rear contraction member; The third end of the front contraction member is provided with a front limiting member protruding from a side of the front contraction member away from the front fixed mold core part; the front mold seat is provided with a first limiting structure; the front limiting member is used to cooperate with the first limiting structure to limit the movement stroke of the front contraction member relative to the front fixed mold core part; The third end of the rear contraction member is provided with a rear limiting member protruding from a side of the rear contraction member away from the rear fixed mold core part; the rear mold seat is provided with a second limiting structure; the rear limiting member is used to cooperate with the second limiting structure to limit the movement stroke of the rear contraction member relative to the rear fixed mold core part.

10. The injection mold of claim 5, wherein, The side of the rear mold seat facing the front mold seat is slidingly provided with a first sliding block and a second sliding block, the first sliding block is connected with a first splicing block, and the second sliding block is connected with a second splicing block; the first splicing block is provided with a first molding groove, and the second splicing block is provided with a second molding groove; The injection mold comprises a first inclined guide rod and a second inclined guide rod, one end of the first inclined guide rod and one end of the second inclined guide rod are fixed to the front mold seat; the first inclined guide rod and the second inclined guide rod extend in a direction away from each other from the end close to the front mold seat to the end close to the rear mold seat; Wherein, the first sliding block and the first inclined guide rod slidingly cooperate, and the second sliding block and the second inclined guide rod slidingly cooperate, so that when the front mold seat and the rear mold seat relatively approach, the first sliding block and the second sliding block are driven by the first inclined guide rod and the second inclined guide rod to relatively approach, so that the first molding groove and the second molding groove are enclosed to form a molding cavity; and when the front mold seat and the rear mold seat relatively approach, the front mold core and the rear mold core are relatively approached by the front mold seat and the rear mold seat, so that the front mold core and the rear mold core can respectively extend into the molding cavity when the molding cavity is enclosed.

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