Hollow cylinder injection mold

Abstract

This utility model belongs to the field of injection mold technology, specifically relating to a hollow cylindrical injection mold, comprising: a fixed mold body, which includes a fixed template and a fixed mold frame, the fixed mold frame being slidably disposed on the side of the fixed template, and a fixed mold core being disposed within the fixed mold frame; and a plurality of fixed mold cores inserted into the fixed template, the fixed mold cores penetrating the fixed mold core; a movable mold body, which is slidably disposed on the side of the fixed mold body, the movable mold body including a movable mold frame, a movable mold core being disposed within the movable mold frame, the movable mold core having a movable mold cavity, the movable mold body being adapted to slide toward the fixed mold body so that the movable mold core and the fixed mold core are joined together, and the fixed mold core is inserted into the movable mold cavity to form a closed mold cavity, thereby completing the molding of the product; and a plurality of damping pins being disposed on the movable mold frame, and a plurality of insertion holes being disposed on the fixed mold frame; when the movable mold body moves away from the fixed mold body, the damping pins can drive the fixed mold frame away from the template, so that the fixed mold core and the fixed mold core undergo relative displacement, thereby ejecting the product from the fixed mold core.

Description

Technical Field

[0001] This utility model belongs to the field of injection mold technology, specifically relating to a hollow cylindrical injection mold. Background Technology

[0002] The injection pen is an innovative drug delivery device that combines medication and injection functions, designed to enable patients who require long-term subcutaneous injections to self-medicate more safely and conveniently.

[0003] Existing injection pens typically consist of several hollow cylinders (including the pen body, support, and rotating cylinder, etc.), which are usually produced using injection molding. Molten plastic is injected into the mold cavity formed by the combination of the moving mold core and the fixed mold core in the injection mold. The moving mold core usually has a moving mold cavity to form the outer wall of the product, and the fixed mold core usually has a fixed mold core to form the inner wall of the product. However, because the contact area between the hollow cylinder and the fixed mold core is relatively large, the product may stick to the fixed mold core when the moving mold core is demolded, which may affect the continuous production of the product.

[0004] Therefore, how to prevent products from sticking to the mold core during demolding, thus preventing continuous production, is a technical problem that urgently needs to be solved in this field.

[0005] It should be noted that the information disclosed in this background section is only for understanding the background technology of this application concept, and therefore, the above description is not considered to constitute prior art information. Utility Model Content

[0006] This disclosure provides at least one hollow cylindrical injection mold.

[0007] In a first aspect, embodiments of this disclosure provide a hollow cylindrical injection mold, comprising: a fixed mold body, which includes a fixed template and a fixed mold frame, the fixed mold frame being slidably disposed on the side of the fixed template, and a fixed mold core being disposed within the fixed mold frame; and a plurality of fixed mold cores inserted into the fixed template, the fixed mold cores penetrating the fixed mold core; and a movable mold body, which is slidably disposed on the side of the fixed mold body, the movable mold body including a movable mold frame, a movable mold core being disposed within the movable mold frame, the movable mold core having a movable mold cavity, and the movable mold body being adapted to slide towards the fixed template. The mold body allows the moving mold core and the fixed mold core to assemble, and the fixed mold core to be inserted into the moving mold cavity to form a mold cavity, thus completing the product molding; and the moving mold frame is provided with a plurality of damping pins, and the fixed mold frame is provided with a plurality of insertion holes; wherein, when the moving mold body slides toward the fixed mold body, the damping pins are inserted into the insertion holes and push the fixed mold frame toward the fixed mold plate; when the moving mold body moves away from the fixed mold body, the damping pins drive the fixed mold frame away from the fixed mold plate, so that the side wall of the fixed mold core ejects the product on the fixed mold core.

[0008] In one optional embodiment, the side wall of the moving mold frame is provided with a mounting countersunk hole, the damping pin is engaged in the mounting countersunk hole, and the axis of the damping pin is inserted with a bolt so that the damping pin is detachably connected in the mounting countersunk hole.

[0009] In one optional embodiment, a plurality of guide pins are inserted into the fixed mold plate; a plurality of first guide rings are inserted into the fixed mold frame, the first guide rings being sleeved on the guide pins; and a plurality of second guide rings are inserted into the moving mold frame, the second guide rings being adapted to be sleeved on the guide pins when the moving mold body slides toward the fixed mold body.

[0010] In one optional embodiment, the fixed mold frame is provided with a through hole, the opening of the through hole is provided with a limiting countersunk hole, a limiting pin is inserted into the through hole, the tail end of the limiting pin is provided with a limiting ring, the limiting ring is adapted to be abutted by the end face of the limiting countersunk hole to limit the fixed mold frame; and the front end of the limiting pin is provided with a thread to be connected to the fixed template.

[0011] In one optional embodiment, the fixed template has a notch for mounting a pressing plate, the pressing plate being connected to the fixed template by bolts; the pressing plate has a plurality of mold core holes, the fixed mold core is inserted into the mold core holes, and the opening of the mold core hole is provided with a directional notch, the end of the fixed mold core is provided with a directional block, the directional block being engaged in the directional notch; and the sidewalls of the directional block and the directional notch are provided with directional flat sections.

[0012] In one optional embodiment, a sprue sleeve is inserted into the fixed mold plate, the sprue sleeve has a feed hole, and the end of the sprue sleeve penetrates through the fixed mold core; injection channels are formed on the fixed mold core and the moving mold core, the injection channels are connected to the feed hole; and the injection channels are adapted to be assembled and connected to the moving mold cavity.

[0013] In one optional embodiment, the fixed mold core is provided with a plurality of venting ring grooves and venting holes; the venting ring grooves are arranged around the outside of the fixed mold core, and one end of the venting hole penetrates the side wall of the fixed mold core, while the other end communicates with the venting ring grooves.

[0014] In one optional embodiment, the moving mold body further includes a moving template and a pair of support plates; the support plates are symmetrically arranged on the sidewalls of the moving template, and the moving mold frame is arranged on the support plates; and the support plate bracket is slidably provided with a push plate, the push plate is provided with an ejector pin, and the end of the ejector pin extends into the moving mold cavity.

[0015] In one optional embodiment, the ejector pin has a mounting hole along its axis; the moving mold plate is provided with a moving mold core, which is inserted into the mounting hole and extends into the moving mold cavity.

[0016] The beneficial effect of this utility model is that, by sliding the fixed mold frame on the fixed template and placing the fixed mold core on the fixed mold frame, when the moving mold body moves away from the fixed mold body, the damping pin can drive the fixed mold frame away from the template, so that the fixed mold core and the fixed mold core will have relative displacement, so that the side wall of the fixed mold core will push out the product on the fixed mold core, thus avoiding the product sticking to the fixed mold core during demolding and affecting the continuous production of the product.

[0017] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of this invention are realized and obtained through the structures particularly pointed out in the description, claims, and drawings.

[0018] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 A perspective view of a hollow cylindrical injection mold provided in an embodiment of this disclosure; Figure 2 This is a schematic diagram of the structure of a mold body provided in an embodiment of the present disclosure; Figure 3 An exploded view of a mold body provided in an embodiment of this disclosure; Figure 4 A perspective view of a moving model body provided in an embodiment of this disclosure; Figure 5 This is a cross-sectional view of a moving mold body provided in an embodiment of this disclosure.

[0021] In the picture: 1. Fixed mold body; 11. Fixed template; 11a. Fixed mold core; 11aa. Orientation block; 11b. Guide pin; 11c. Pressing plate; 11d. Mold core hole; 11e. Orientation notch; 11f. Orientation flat part; 11g. Sprue bushing; 11ga. Feed hole; 12. Fixed mold frame; 12a. Insertion hole; 12b. First guide ring; 12c. Through hole; 12d. Limiting countersunk hole; 12e. Limiting pin; 12f. Limiting ring; 13. Fixed mold core; 13a. Venting ring groove; 13b. Venting hole; 2. Dynamic mold body; 21. Moving mold frame; 21a. Damping pin; 21b. Mounting countersunk hole; 21c. Second guide ring; 22. Moving mold core; 22a. Moving mold cavity; 23. Moving template; 23a. Moving mold core; 24. Support plate; 25. Push plate; 25a. Ejector pin; 25b. Mounting hole; 3. Injection channel. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0023] In this document, when it is mentioned that a first component is located on a second component, this can mean that the first component can be directly formed on the second component, or that a third component can be inserted between the first and second components. Furthermore, in the accompanying drawings, the thickness of the components may be exaggerated or reduced for the purpose of effectively describing the technical content.

[0024] The terminology used herein is for the purpose of describing specific exemplary configurations only and is not intended to be limiting. As used herein, the singular articles “a,” “an,” and “the” may also be intended to include plural forms unless otherwise clearly stated herein. The terms “comprising,” “including,” and “having” are inclusive and thus specify the presence of features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein should not be construed as requiring them to be performed in the specific order discussed or shown, unless specifically identified as such. Additional or alternative steps may be employed.

[0025] As used herein, the phrases “in one embodiment,” “according to one embodiment,” “in some embodiments,” etc., generally refer to the fact that a particular feature, structure, or characteristic following the phrase can be included in at least one embodiment of this disclosure. Therefore, a particular feature, structure, or characteristic can be included in more than one embodiment of this disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms “example,” “exemplary,” etc., are used to “serve as an example, instance, or illustration.” Any implementation, aspect, or design described herein as “example” or “exemplary” is not necessarily to be construed as preferred or superior to other implementations, aspects, or designs. Rather, the use of the terms “example,” “exemplary,” etc., is intended to present concepts in a specific manner.

[0026] Research has revealed that in existing technologies, the product may stick to the fixed mold core during demolding of the moving mold core, making it impossible to eject and thus hindering continuous production. This is the problem and objective that the utility model aims to solve.

[0027] Based on the above research, this disclosure provides a hollow cylindrical injection mold in which the moving mold core slides synchronously when it is demolded, so that the moving mold core and the fixed mold core are relatively displaced to eject the product from the fixed mold core.

[0028] The shortcomings of the above solutions are the result of the utility model inventor's practice and careful research. Therefore, the discovery process of the above problems and the solutions proposed in this disclosure should be considered as contributions made by the utility model inventor to this disclosure.

[0029] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0030] The following detailed description, with reference to the accompanying drawings, describes some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0031] See Figures 1 to 5This paper illustrates a hollow cylindrical injection mold, comprising: a fixed mold body 1, which includes a fixed template 11 and a fixed mold frame 12, the fixed mold frame 12 being slidably disposed on the side of the fixed template 11, and a fixed mold core 13 disposed within the fixed mold frame 12; and a plurality of fixed mold cores 11a inserted into the fixed template 11, the fixed mold cores 11a penetrating the fixed mold core 13; a movable mold body 2, which is slidably disposed on the side of the fixed mold body 1, the movable mold body 2 including a movable mold frame 21, the movable mold frame 21 being disposed within the movable mold core 22, the movable mold core 22 having a movable mold cavity 22a, the movable mold body 2 being adapted to slide toward the fixed mold body 1, so that the movable mold core 22 and the fixed mold core 13 are joined together, and the fixed mold cores 11a are inserted into the movable mold cavity 22a to form a mold cavity, completing the molding of the product; and a plurality of damping pins 21a disposed on the movable mold frame 21, the fixed mold cores 11a being inserted into the fixed mold core 13, the fixed mold core 11a being inserted into the fixed mold cavity 22a to form a mold cavity, completing the molding of the product; and a plurality of damping pins 21a disposed on the movable mold frame 21, the fixed mold core 11a being inserted into the fixed mold core 13 ... The mold frame 12 is provided with a plurality of insertion holes 12a; wherein, when the moving mold body 2 slides toward the fixed mold body 1, the damping pin 21a is inserted into the insertion hole 12a and pushes the fixed mold frame 12 toward the fixed mold plate 11; when the moving mold body 2 moves away from the fixed mold body 1, the damping pin 21a drives the fixed mold frame 12 away from the fixed mold plate 11, so that the side wall of the fixed mold core 13 ejects the product on the fixed mold core 11a; in short, by sliding the fixed mold frame 12 on the fixed mold plate 11 and setting the fixed mold core 13 on the fixed mold frame 12, when the moving mold body 2 moves away from the fixed mold body 1, the damping pin 21a can drive the fixed mold frame 12 away from the plate, so that the fixed mold core 13 and the fixed mold core 11a are relatively displaced, so that the side wall of the fixed mold core 13 ejects the product on the fixed mold core 11a, avoiding the product from sticking to the fixed mold core 11a during demolding and affecting the continuous production of the product.

[0032] In some embodiments, the side wall of the moving mold frame 21 is provided with a mounting countersunk hole 21b, the damping pin 21a is engaged in the mounting countersunk hole 21b, and the axis of the damping pin 21a is inserted with a bolt so that the damping pin 21a is detachably connected in the mounting countersunk hole 21b; in short, the damping pin 21a is installed in the mounting countersunk hole 21b by bolts, which is convenient and reliable for installation.

[0033] In some embodiments, a plurality of guide pins 11b are inserted into the fixed mold plate 11; a plurality of first guide rings 12b are inserted into the fixed mold frame 12, and the first guide rings are sleeved on the guide pins 11b; and a plurality of second guide rings 21c are inserted into the moving mold frame 21, the second guide rings 21c being adapted to be sleeved on the guide pins 11b when the moving mold body 2 slides toward the fixed mold body 1; in short, the fixed mold plate 11 is fixedly mounted on the injection molding machine, and the fixed mold frame 12 is provided with first guide rings 12b so that the fixed mold frame 12 is slidably mounted on the guide pins 11b.

[0034] In some embodiments, the fixed mold frame 12 has a through hole 12c, the opening of the through hole 12c is provided with a limiting countersunk hole 12d, a limiting pin 12e is inserted into the through hole 12c, and a limiting ring 12f is provided at the tail end of the limiting pin 12e. The limiting ring 12f is adapted to be abutted by the end face of the limiting countersunk hole 12d to limit the fixed mold frame 12; and the front end of the limiting pin 12e is provided with a thread to be connected to the fixed template 11; in short, when the fixed mold frame 12 slides outward, the limiting countersunk hole 12d can be abutted by the limiting ring 12f to limit the sliding stroke of the fixed mold frame 12.

[0035] In some embodiments, the fixed template 11 has a notch for mounting a pressing plate 11c, the pressing plate 11c being connected to the fixed template 11 by bolts; the pressing plate 11c has a plurality of core holes 11d, the fixed core 11a being inserted into the core holes 11d, and the opening of the core holes 11d having a directional notch 11e; the end of the fixed core 11a having a directional block 11aa, the directional block 11aa being engaged in the directional notch 11e; and the sidewalls of the directional block 11aa and the directional notch 11e having directional flat sections 11f; in short, the pressing plate 11c is fastened to the notch on the fixed template 11 and is detachably connected to the fixed template 11 by bolts, the fixed core 11a is inserted into the core hole 11d, and the directional block 11aa and the directional notch 11e at the end of the fixed core 11a are positioned by the directional flat section 11f to limit the circumferential angle of the fixed core 11a.

[0036] In some embodiments, a sprue sleeve 11g is inserted into the fixed mold plate 11, and a feed hole 11ga is provided inside the sprue sleeve 11g. The end of the sprue sleeve 11g passes through the fixed mold core 13. An injection channel 3 is provided on the fixed mold core 13 and the moving mold core 22. The injection channel 3 is connected to the feed hole 11ga. The injection channel 3 is adapted to be assembled and connected to the moving mold cavity 22a. In short, the feed hole 11ga is adapted to connect to the feed pipe, and the molten plastic enters the moving mold cavity 22a through the injection channel 3 to complete the molding of the product.

[0037] In some embodiments, the fixed mold core 13 is provided with a plurality of venting ring grooves 13a and venting holes 13b; the venting ring grooves 13a are arranged around the outside of the fixed mold core 11a, and one end of the venting hole 13b penetrates the side wall of the fixed mold core 13, and the other end communicates with the venting ring grooves 13a; in short, the air in the moving mold cavity 22a enters the venting ring grooves 13a through the gap between the fixed mold core 13 and the moving mold core 22, and is finally discharged through the venting holes 13b.

[0038] In some embodiments, the moving mold body 2 further includes a moving template 23 and a pair of support plates 24; the support plates 24 are symmetrically arranged on the sidewalls of the moving template 23, and the moving mold frame 21 is mounted on the support plates 24; and the support plates 24 are slidably supported by a push plate 25, and the push plate 25 is provided with an ejector pin 25a, the end of which extends into the moving mold cavity 22a; in short, the moving template 23 is mounted on the moving end of the injection molding machine, and the push plate 25 is connected to the hydraulic rod in the injection molding machine to complete the sliding. When the moving mold body 2 moves away from the fixed mold body 1, the push plate 25 drives the ejector pin 25a to eject the product from the moving mold cavity 22a.

[0039] In some embodiments, the axis of the ejector pin 25a is provided with a mounting hole 25b; the moving template 23 is provided with a moving mold core 23a, which is inserted into the mounting hole 25b and extends into the moving mold cavity 22a; in short, the moving template 23 is provided with a moving mold core 23a, which extends out of the mounting hole 25b into the moving mold cavity 22a to form the end shape of the product.

[0040] In the description of the embodiments of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0041] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence unless expressly indicated herein. Therefore, without departing from the teachings of the exemplary embodiments, the first element, component, region, layer, or segment discussed above may be referred to as the second element, component, region, layer, or segment.

[0042] Spatially relative terms, such as “inside,” “outside,” “below,” “below,” “down,” “above,” “up,” etc., may be used herein to describe the relationship between one element or feature illustrated in the figures and another element or feature. In addition to the orientations depicted in the figures, spatially relative terms may be intended to cover different orientations of the device in use or operation. For example, if the device in the figure is flipped, an element described as “below” or “below” other elements or features would be oriented as “above” other elements or features. Thus, the example term “below” can cover both above and below orientations. The device may be oriented in other ways (rotated 90 degrees or in other orientations), and the spatially relative descriptors used herein are interpreted accordingly.

[0043] In the above discussion, unless otherwise stated, when used to describe numerical values, the terms “about,” “approximately,” “basically,” etc., indicate a change of + / - 10% in that value.

[0044] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A hollow cylindrical injection mold, characterized in that, include: A fixed mold body (1) includes a fixed mold plate (11) and a fixed mold frame (12), wherein the fixed mold frame (12) is slidably disposed on the side of the fixed mold plate (11), and a fixed mold core (13) is disposed within the fixed mold frame (12); and, A plurality of fixed mold cores (11a) are inserted into the fixed template (11), and the fixed mold cores (11a) penetrate the fixed mold core (13). A moving mold body (2) is slidably disposed on the side of the fixed mold body (1). The moving mold body (2) includes a moving mold frame (21), and a moving mold core (22) is disposed within the moving mold frame (21). A moving mold cavity (22a) is formed on the moving mold core (22). The moving mold body (2) is adapted to slide toward the fixed mold body (1) so that the moving mold core (22) and the fixed mold core (13) are joined together, and the fixed mold core (11a) is inserted into the moving mold cavity (22a) to form a mold cavity, thereby completing the molding of the product; and, The moving mold frame (21) is provided with a plurality of damping pins (21a), and the fixed mold frame (12) is provided with a plurality of insertion holes (12a); wherein, When the moving mold body (2) slides toward the fixed mold body (1), the damping pin (21a) is inserted into the insertion hole (12a) and pushes the fixed mold frame (12) toward the fixed mold plate (11). When the moving mold body (2) moves away from the fixed mold body (1), the damping pin (21a) drives the fixed mold frame (12) away from the fixed mold plate (11) so that the side wall of the fixed mold core (13) pushes out the product on the fixed mold core (11a).

2. The hollow cylindrical injection mold as described in claim 1, characterized in that, The side wall of the moving mold frame (21) is provided with a mounting countersunk hole (21b), the damping pin (21a) is engaged in the mounting countersunk hole (21b), and the axis of the damping pin (21a) is connected with a bolt so that the damping pin (21a) can be detachably connected in the mounting countersunk hole (21b).

3. The hollow cylindrical injection mold as described in claim 1, characterized in that, Several guide pins (11b) are inserted into the fixed template (11). A plurality of first guide rings (12b) are inserted into the fixed mold frame (12), and the first guide rings are sleeved on the guide pins (11b); and, A plurality of second guide rings (21c) are inserted into the moving mold frame (21), and the second guide rings (21c) are adapted to be sleeved on the guide pin (11b) when the moving mold body (2) slides toward the fixed mold body (1).

4. The hollow cylindrical injection mold as described in claim 1, characterized in that, The fixed mold frame (12) has a through hole (12c), and a limiting countersunk hole (12d) is provided at the opening of the through hole (12c). A limiting pin (12e) is inserted into the through hole (12c), and a limiting ring (12f) is provided at the tail end of the limiting pin (12e). The limiting ring (12f) is adapted to be held against the end face of the limiting countersunk hole (12d) to limit the fixed mold frame (12); and, The front end of the limiting pin (12e) is threaded to be connected to the fixed template (11).

5. The hollow cylindrical injection mold as described in claim 1, characterized in that, The fixed template (11) has a notch for setting a pressing plate (11c), and the pressing plate (11c) is connected to the fixed template (11) by bolts; The pressing plate (11c) has a plurality of mold core holes (11d), the fixed mold core (11a) is inserted into the mold core holes (11d), and the opening of the mold core hole (11d) is provided with a directional notch (11e). The end of the fixed mold core (11a) is provided with a directional block (11aa), and the directional block (11aa) is engaged in the directional notch (11e); and, The sidewalls of the directional block (11aa) and the directional notch (11e) are provided with directional flat sections (11f).

6. The hollow cylindrical injection mold as described in claim 1, characterized in that, A sprue sleeve (11g) is inserted into the fixed mold plate (11), and a feed hole (11ga) is opened in the sprue sleeve (11g). The end of the sprue sleeve (11g) passes through the fixed mold core (13). The fixed mold core (13) and the moving mold core (22) are provided with injection channels (3), which are connected to the feed hole (11ga); and, The injection channel (3) is adapted to be assembled and connected to the moving mold cavity (22a).

7. The hollow cylindrical injection mold as described in claim 1, characterized in that, The fixed mold core (13) is provided with a plurality of venting ring grooves (13a) and venting holes (13b). The venting ring groove (13a) is arranged around the outside of the fixed mold core (11a), and one end of the venting hole (13b) penetrates the side wall of the fixed mold core (13), while the other end is connected to the venting ring groove (13a).

8. The hollow cylindrical injection mold as described in claim 1, characterized in that, The moving mold body (2) also includes a moving template (23) and a pair of support plates (24); The support plates (24) are symmetrically arranged on the side walls of the moving template (23), and the moving template frame (21) is mounted on the support plates (24); and, The support plate (24) is slidably provided with a push plate (25), and an ejector pin (25a) is provided on the push plate (25). The end of the ejector pin (25a) extends into the moving mold cavity (22a).

9. The hollow cylindrical injection mold as described in claim 8, characterized in that, The axis of the ejector pin (25a) is provided with a mounting hole (25b); The moving template (23) is provided with a moving mold core (23a), which is inserted into the mounting hole (25b) and extends into the moving mold cavity (22a).

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