Forming mold of injection molding part with concave cavity position

Abstract

The invention discloses a forming mold of an injection-molded part with a concave cavity position, and relates to the field of molds. A core-pulling sliding block is movably arranged on a fixed mold; when the movable mold and the fixed mold are in a mold closing state, the first limiting column is located at the end, away from the forming part, of the first strip-shaped groove, and the second limiting column is located at the end, away from the forming part, of the second strip-shaped groove. In the demolding process, the core-pulling sliding block moves in the direction away from the concave cavity position, and after the first limiting column abuts against the end, close to the forming part, of the first strip-shaped groove and the second limiting column abuts against the end, close to the forming part, of the second strip-shaped groove, the core-pulling sliding block drives the first core-pulling rod and the second core-pulling rod to be away from the concave cavity position. The first core-pulling rod and the second core-pulling rod which are opposite in inclination direction and can move are arranged on the core-pulling sliding block, the moving direction of the first core-pulling rod and the moving direction of the second core-pulling rod are controlled through movement of the core-pulling sliding block, lateral core pulling of the concave cavity position can be achieved, and the interference problem is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of molds, and in particular to a molding mold for an injection molded part with a concave cavity. Background Art

[0002] like Figure 1 The injection molded part 1 shown has a special cavity 1a, and one side or two opposite sides of the opening of the cavity 1a have a folded edge 1b, which makes the opening area smaller than the area of ​​the internal cross-section of the cavity. For a demolding structure similar to this special cavity, the existing mold needs to perform lateral core pulling in multiple directions, and a core pulling mechanism needs to be set in each direction for demolding. However, due to the limited space of the mold, setting up multiple core pulling mechanisms will result in the spacing between each core pulling mechanism being too small, which is prone to interference, and the structure is more complicated and difficult to assemble. Summary of the invention

[0003] The main purpose of the present invention is to provide a molding die for an injection molded part with a concave cavity, aiming to solve the problems in the background technology.

[0004] In order to achieve the above object, the technical solutions of the present invention are:

[0005] The present invention discloses a molding die for an injection molded part having a concave cavity, comprising a movable mold, a fixed mold and a core pulling assembly, wherein the core pulling assembly comprises:

[0006] A core-pulling slider is movably arranged on the fixed mold, and has a first channel and a second channel passing through the core-pulling slider, and the first channel and the second channel are arranged horizontally and tilted in opposite directions; the core-pulling slider also has a first strip groove and a second strip groove, the first strip groove is connected to the first channel and is parallel to the first channel, and the second strip groove is connected to the second channel and is parallel to the second channel;

[0007] A first core pulling rod, which can be movably inserted into the first channel;

[0008] A first limiting column, which is arranged on the first core-pulling rod and located in the first strip groove;

[0009] A second core-pulling rod, which can be movably inserted into the second channel;

[0010] A second limiting column, which is arranged on the second core-pulling rod and located in the second strip-shaped groove;

[0011] When the movable mold and the fixed mold are in a mold-closing state, the core-pulling slider, the first core-pulling rod, and the end of the second core-pulling rod together form a molding portion of the concave cavity of the injection molded part, the first limiting column is located at an end of the first strip groove away from the molding portion, and the second limiting column is located at an end of the second strip groove away from the molding portion;

[0012] During the demolding process, the core pulling slider moves in the direction away from the concave cavity position. After the first limiting column abuts against one end of the first strip groove close to the forming part and the second limiting column abuts against one end of the second strip groove close to the forming part, the core pulling slider drives the first core pulling rod and the second core pulling rod away from the concave cavity position.

[0013] Compared with the prior art, the present invention discloses a molding die for an injection molded part with a concave cavity, in which a first core pulling rod and a second core pulling rod which are movable and have opposite inclined directions are arranged on a core pulling slider. The moving directions of the first core pulling rod and the second core pulling rod are controlled by moving the core pulling slider, thereby realizing lateral core pulling of the concave cavity. This simplifies the structure, reduces the difficulty of assembly, saves mold space, and avoids interference problems.

[0014] Specifically, the present invention uses the first limiting column on the first core pulling rod and the second limiting column on the second core pulling rod as the force-bearing connecting component of the core pulling slider to drive the first core pulling rod and the second core pulling rod; at the beginning of demolding, the core pulling slider moves in the direction away from the concave cavity position, and the first core pulling rod and the second core pulling rod move closer to each other under the guidance of the first channel and the second channel respectively, so that the first core pulling rod and the second core pulling rod are separated from the opposite sides of the concave cavity position, and the first core pulling rod and / or the second core pulling rod avoid the folding edge at the mouth; after the first limiting column abuts against one end of the first strip groove close to the forming part and the second limiting column abuts against one end of the second strip groove close to the forming part, the core pulling slider drives the first core pulling rod and the second core pulling rod to move synchronously in the direction away from the concave cavity position until the core pulling slider, the first core pulling rod and the second core pulling rod are completely separated from the concave cavity position, completing the demolding action of the concave cavity position.

[0015] In a preferred embodiment, the first core-pulling rod has a first through hole extending vertically therethrough; the second core-pulling rod has a second through hole extending vertically therethrough; the molding mold of the injection molded part having a concave cavity also includes a limit member, and the limit members are respectively inserted into the first through hole and the second through hole, wherein the limit member has a stepped columnar structure, divided into an upper cylindrical portion and a lower cylindrical portion, the diameter of the upper cylindrical portion is greater than the diameter of the lower cylindrical portion, the diameter of the first through hole and the diameter of the second through hole match the diameter of the lower cylindrical portion; the first limit column and the second limit column are composed of the upper cylindrical portion.

[0016] In a preferred embodiment, the core pulling assembly also includes two limit cover plates, which are fixedly mounted on the core pulling slider, and the two limit cover plates are respectively located above the first strip groove and the second strip groove to close the first strip groove and the second strip groove.

[0017] In a preferred embodiment, the cross-sectional shapes of the first channel and the second channel are both polygonal structures.

[0018] In a preferred embodiment, the first core pulling rod is provided with two first arcuate recessed holes arranged at intervals; the center line of the two first arcuate recessed holes is parallel to the length direction of the first core pulling rod; the core pulling assembly also includes a first spring column plug, which is installed on the core pulling slider and is used for concave-convex cooperation with the two first arcuate recessed holes; when the first limiting column abuts against one end of the first strip groove close to the forming part, the first spring column plug cooperates with one of the first arcuate recessed holes, and when the first limiting column abuts against one end of the first strip groove away from the forming part, the first spring column plug cooperates with the other first arcuate recessed hole.

[0019] In a preferred embodiment, the second limiting column has two second arc-shaped recessed holes arranged at intervals; the center line of the two second arc-shaped recessed holes is parallel to the length direction of the second limiting column; the core pulling assembly also includes a second spring column head plug, which is installed on the core pulling slider and is used for concave-convex cooperation with the two second arc-shaped recessed holes; when the second limiting column abuts against one end of the second strip groove close to the forming part, the second spring column head plug cooperates with one of the second arc-shaped recessed holes, and when the second limiting column abuts against one end of the second strip groove away from the forming part, the second spring column head plug cooperates with the other second arc-shaped recessed hole.

[0020] In a preferred embodiment, a T-shaped slide groove is provided on the fixed mold, and the bottom of the core-pulling slider has a T-shaped structure that matches the T-shaped slide groove.

[0021] In a preferred embodiment, the core pulling assembly further comprises an inclined guide column, which is fixedly mounted on the movable mold and inserted into the core pulling slider, and the inclined guide column drives the core pulling slider to move during the mold opening and closing process.

[0022] In a preferred embodiment, a water transport circuit is provided in the core-pulling slider, and the inlet and outlet of the water transport circuit are located at the bottom of the core-pulling slider; the inlet and outlet of the water transport circuit are both connected to an L-shaped joint, and a water pipe is externally connected to the L-shaped joint; two strip-shaped through grooves arranged side by side and spaced apart are provided on the fixed mold for the installation of the L-shaped pipe and the water pipe.

[0023] In a preferred embodiment, the molding mold of the injection molded part with a concave cavity also includes a straight ejector assembly for vertically ejecting the injection molded part; the straight ejector assembly includes a straight ejector pin and an ejector pin plate, the ejector pin plate is vertically movably arranged below the fixed mold, the bottom of the straight ejector pin is fixed on the ejector pin plate, and the straight ejector pin is penetrated through the fixed mold.

[0024] For better understanding and implementation, the present invention is described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0026] Figure 1 It is a structural diagram of an injection molded part with a concave cavity;

[0027] Figure 2 It is a structural diagram of a molding die for an injection molded part having a concave cavity;

[0028] Figure 3 It is the structural diagram of the core pulling assembly;

[0029] Figure 4 It is an exploded view of the core pulling assembly;

[0030] Figure 5 It is the connection diagram of the water transport circuit, L-shaped joint and water pipe;

[0031] Figure 6 It is a cross-sectional view of the connection between the core pulling assembly and the concave cavity;

[0032] Figure 7 It is one of the motion diagrams of the demoulding process of the core pulling component;

[0033] Figure 8 This is the second motion diagram of the demoulding process of the core pulling component.

[0034] Description of reference numerals:

[0035] 2-fixed mold, 21-T-type slide, 22-strip through groove, 3-core-pulling slider, 31-first channel, 32-second channel, 33-first strip groove, 34-second strip groove, 35-water transport circuit, 4-first core-pulling rod, 42-first arc-shaped concave hole, 5-first limiting column, 6-second core-pulling rod, 62-second arc-shaped concave hole, 7-second limiting column, 8-limiting member, 81-upper cylindrical part, 82-lower cylindrical part, 9-limiting cover plate, 10-first spring column head plug, 11-second spring column head plug, 13-oblique guide column, 14-L-type joint, 15-water pipe, 16-straight ejector pin, 17-ejector pin plate. DETAILED DESCRIPTION

[0036] In order to better illustrate the present invention, the present invention is further described in detail below with reference to the accompanying drawings.

[0037] It should be clear that the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the embodiments of the present application.

[0038] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the embodiments of the present application. The singular forms of "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0039] Combination Figures 1 to 8 As shown, the present invention discloses a molding die for an injection molded part having a concave cavity, comprising a movable mold, a fixed mold 2 and a core pulling assembly, wherein the core pulling assembly comprises:

[0040] A core-pulling slider 3 is movably arranged on the fixed mold 2, and has a first channel 31 and a second channel 32 penetrating therein, and the first channel 31 and the second channel 32 are arranged horizontally and tilted in opposite directions; the core-pulling slider 3 also has a first strip groove 33 and a second strip groove 34, the first strip groove 33 is connected to the first channel 31 and is parallel to the first channel 31, and the second strip groove 34 is connected to the second channel 32 and is parallel to the second channel 32;

[0041] A first core pulling rod 4, which can be movably inserted into the first channel 31;

[0042] A first limiting column 5, which is arranged on the first core-pulling rod 4 and located in the first strip groove 33;

[0043] A second core pulling rod 6, which can be movably inserted into the second channel 32;

[0044] A second limiting column 7, which is arranged on the second core-pulling rod 6 and located in the second strip groove 34;

[0045] When the movable mold and the fixed mold 2 are in a mold-closing state, the core-pulling slider 3, the first core-pulling rod 4, and the ends of the second core-pulling rod 6 together form a molding portion of the concave cavity of the injection molded part, the first limiting column 5 is located at an end of the first strip groove 33 away from the molding portion, and the second limiting column 7 is located at an end of the second strip groove 34 away from the molding portion;

[0046] During the demolding process, the core-pulling slider 3 moves in the direction away from the concave cavity position. After the first limiting column 5 abuts against one end of the first strip groove 33 close to the forming part and the second limiting column 7 abuts against one end of the second strip groove 34 close to the forming part, the core-pulling slider 3 drives the first core-pulling rod 4 and the second core-pulling rod 6 away from the concave cavity position.

[0047] Compared with the prior art, the present invention discloses a molding mold for an injection molded part with a concave cavity, in which a first core pulling rod 4 and a second core pulling rod 6 which are movable and have opposite inclined directions are arranged on a core pulling slider 3. The moving directions of the first core pulling rod 4 and the second core pulling rod 6 are controlled by moving the core pulling slider 3, so that lateral core pulling of the concave cavity can be achieved, which simplifies the structure, reduces the difficulty of assembly, saves mold space, and avoids interference problems.

[0048] Specifically, combined Figure 7 and Figure 8 As shown, the present invention uses the first limiting column 5 on the first core pulling rod 4 and the second limiting column 7 on the second core pulling rod 6 as the force-bearing connecting parts for the core pulling slider 3 to drive the first core pulling rod 4 and the second core pulling rod 6;

[0049] Combination Figure 7 As shown, at the beginning of demoulding, the core pulling slider 3 moves away from the concave cavity 1a, and the first core pulling rod 4 and the second core pulling rod 6 move closer to each other under the guidance of the first channel 31 and the second channel 32, respectively, so that the first core pulling rod 4 and the second core pulling rod 6 are separated from the two opposite sides of the concave cavity, and the first core pulling rod 4 and / or the second core pulling rod 6 avoid the folded edge 1b at the mouth;

[0050] Combination Figure 8 As shown, after the first limiting column 5 abuts against one end of the first strip groove 33 close to the forming portion and the second limiting column 7 abuts against one end of the second strip groove 34 close to the forming portion, the core pulling slider 3 drives the first core pulling rod 4 and the second core pulling rod 6 to move synchronously in the direction away from the concave cavity position until the core pulling slider 3, the first core pulling rod 4 and the second core pulling rod 6 are completely separated from the concave cavity position, completing the demolding action of the concave cavity position.

[0051] In the present invention, since the first core pulling rod 4 needs to be inserted into the first channel 31 and the second core pulling rod 6 needs to be inserted into the second channel 32, the first core pulling rod 4 and the first limiting column 5 can only be installed as two parts, and the second core pulling rod 6 and the second limiting column 7 can only be installed as two parts. However, the width of the first core pulling rod 4 and the second core pulling rod 6 is relatively narrow, only 10 mm, and the first limiting column 5 and the second limiting column 7 are hit by the core pulling slider 3, which is not suitable for a small diameter threaded connection method. Therefore, the present invention directly adopts a plug-in method to connect the first core pulling rod 4 and the first limiting column 5, and to connect the second core pulling rod 6 and the second limiting column 7; in the present invention, combined with Figure 4 As shown, the first core pulling rod 4 has a first through hole penetrating along the vertical direction; the second core pulling rod 6 has a second through hole penetrating along the vertical direction; the molding mold of the injection molded part with a concave cavity also includes a limit member 8, and the limit member 8 is respectively inserted into the first through hole and the second through hole, wherein the limit member 8 is a stepped columnar structure, divided into an upper cylindrical part 81 and a lower cylindrical part 82, the diameter of the upper cylindrical part 81 is larger than the diameter of the lower cylindrical part 82, and the diameter of the first through hole and the diameter of the second through hole match the diameter of the lower cylindrical part 82; the first limit column 5 and the second limit column 7 are composed of the upper cylindrical part 81; the connection between the first core pulling rod 4 and the limit member 8 is realized by plugging the first core pulling rod 4 and the limit member 8, and the connection between the second core pulling rod 6 and the second limit column 7 is realized by plugging the second core pulling rod 6 and the limit member 8.

[0052] Furthermore, combined with Figure 3 and Figure 4 As shown, the core pulling assembly also includes two limit cover plates 9, and the two limit cover plates 9 are fixedly mounted on the core pulling slider 3, and the two limit cover plates 9 are respectively located above the first strip groove 33 and the second strip groove 34 to close the first strip groove 33 and the second strip groove 34, thereby limiting the first limit column 5 from upwardly separating from the first core pulling rod 4 and limiting the second limit column 7 from upwardly separating from the second core pulling rod 6.

[0053] In one embodiment, to prevent the first core pulling rod 4 and the second core pulling rod 6 from rotating and changing the shape of the forming portion, the cross-sectional shapes of the first channel 31 and the second channel 32 are both polygonal structures, such as triangles, quadrilaterals, pentagons, etc.

[0054] In one embodiment, in combination Figure 4As shown, the first core pulling rod 4 is provided with two first arc-shaped recessed holes 42 arranged at intervals; the center line of the two first arc-shaped recessed holes 42 is parallel to the length direction of the first core pulling rod 4; the core pulling assembly also includes a first spring column plug 10, which is installed on the core pulling slider 3 and is used for concave-convex cooperation with the two first arc-shaped recessed holes 42; when the first limiting column 5 abuts against one end of the first strip groove 33 close to the forming part, the first spring column plug 10 cooperates with one of the first arc-shaped recessed holes 42, and when the first limiting column 5 abuts against one end of the first strip groove 33 away from the forming part, the first spring column plug 10 cooperates with the other first arc-shaped recessed hole 42; through the cooperation between the first spring column and the two first arc-shaped recessed holes 42, the position between the first core pulling rod 4 and the core pulling slider 3 is accurately locked, which plays a role in accurate positioning.

[0055] In one embodiment, in combination Figure 4 As shown, the second limiting column 7 has two second arc-shaped recessed holes 62 arranged at intervals; the center line of the two second arc-shaped recessed holes 62 is parallel to the length direction of the second limiting column 7; the core pulling assembly also includes a second spring column head plug 11, which is installed on the core pulling slider 3 and is used for concave-convex cooperation with the two second arc-shaped recessed holes 62; when the second limiting column 7 and the second strip groove 34 are against one end close to the forming part, the second spring column head plug 11 cooperates with one of the second arc-shaped recessed holes 62, and when the second limiting column 7 and the second strip groove 34 are against one end away from the forming part, the second spring column head plug 11 cooperates with the other second arc-shaped recessed hole 62; through the cooperation of the second spring column head plug 11 and the two second arc-shaped recessed holes 62, the position between the second core pulling rod 6 and the core pulling slider 3 is accurately locked, which plays a role in accurate positioning.

[0056] In one embodiment, in combination Figure 1 and Figure 2 As shown, a T-shaped slot is provided on the fixed mold 2, and the bottom of the core-pulling slider 3 has a T-shaped structure matched with the T-shaped slot to guide the movement of the core-pulling slider 3 so that the core-pulling slider 3 moves linearly.

[0057] In one embodiment, in combination Figure 1As shown, the core pulling assembly further includes an inclined guide column 13, which is fixedly mounted on the movable mold and inserted into the core pulling slider 3. The inclined guide column 13 drives the core pulling slider 3 to move during the mold opening and closing process. When the mold is opened, the movable mold moves upward relative to the fixed mold 2. During the process of the movable mold driving the inclined guide column 13 to move upward, the inclined guide column 13 drives the core pulling slider 3 to move in a direction away from the concave cavity position; when the mold is closed, the movable mold moves downward relative to the fixed mold 2. During the process of the movable mold driving the inclined guide column 13 to move downward, the inclined guide column 13 drives the core pulling slider 3 to move in a direction close to the concave cavity position 1a.

[0058] Furthermore, combined with Figure 5 As shown, a water transport circuit 35 is provided in the core-pulling slider 3, and the water transport circuit 35 is formed by drilling a hole on the core-pulling slider 3, so that cold water is introduced into the water transport circuit 35 to cool the core-pulling slider 3, and the inlet and outlet of the water transport circuit 35 are located at the bottom of the core-pulling slider 3; the inlet and outlet of the water transport circuit 35 are both connected to an L-shaped joint 14, and a water pipe 15 is externally connected to the L-shaped joint 14; two strip-shaped through grooves 22 arranged side by side and at intervals are provided on the fixed mold 2 for the installation of the L-shaped joint 14 and the water pipe 15; with the above structure, the L-shaped joint 14 and the water pipe 15 can reciprocate with the core-pulling slider 3.

[0059] In one embodiment, in combination Figure 1 As shown, the molding mold of the injection molded part with a concave cavity also includes a straight ejector assembly for vertically ejecting the injection molded part; the straight ejector assembly includes a straight ejector pin 16 and an ejector plate 17, the ejector plate 17 is vertically movably arranged below the fixed mold 2, the bottom of the straight ejector pin 16 is fixed on the ejector plate 17, and the straight ejector pin 16 is penetrated by the fixed mold 2, so that when the mold is opened, the ejector plate 17 drives the straight ejector pin 16 to rise and eject the injection molded part upward.

[0060] The present invention is not limited to the above-mentioned embodiments. If various changes or modifications to the present invention do not depart from the spirit and scope of the present invention, and if these changes and modifications fall within the scope of the claims and equivalent technologies of the present invention, the present invention is also intended to include these changes and modifications.

Claims

1. A molding die for an injection molded part having a concave cavity, comprising a movable mold, a fixed mold and a core pulling assembly, characterized in that: The core pulling assembly comprises: A core-pulling slider is movably arranged on the fixed mold, and has a first channel and a second channel passing through the core-pulling slider, and the first channel and the second channel are arranged horizontally and tilted in opposite directions; the core-pulling slider also has a first strip groove and a second strip groove, the first strip groove is connected to the first channel and is parallel to the first channel, and the second strip groove is connected to the second channel and is parallel to the second channel; A first core pulling rod, which can be movably inserted into the first channel; A first limiting column, which is arranged on the first core-pulling rod and located in the first strip groove; A second core-pulling rod, which can be movably inserted into the second channel; A second limiting column, which is arranged on the second core-pulling rod and located in the second strip-shaped groove; When the movable mold and the fixed mold are in a mold-closing state, the core-pulling slider, the first core-pulling rod, and the end of the second core-pulling rod together form a molding portion of the concave cavity of the injection molded part, the first limiting column is located at an end of the first strip groove away from the molding portion, and the second limiting column is located at an end of the second strip groove away from the molding portion; During the demolding process, the core pulling slider moves in the direction away from the concave cavity position. After the first limiting column abuts against one end of the first strip groove close to the forming part and the second limiting column abuts against one end of the second strip groove close to the forming part, the core pulling slider drives the first core pulling rod and the second core pulling rod away from the concave cavity position.

2. The molding die for an injection molded part having a concave cavity according to claim 1, characterized in that: The first core pulling rod has a first through hole penetrating in the vertical direction; The second core-pulling rod has a second through hole penetrating in the vertical direction; The molding mold of the injection molded part with a concave cavity also includes a limit piece, which is respectively inserted into the first through hole and the second through hole, wherein the limit piece is a stepped columnar structure, divided into an upper cylindrical part and a lower cylindrical part, the diameter of the upper cylindrical part is larger than the diameter of the lower cylindrical part, the diameter of the first through hole and the diameter of the second through hole match the diameter of the lower cylindrical part; the first limit column and the second limit column are composed of the upper cylindrical part.

3. The molding die for an injection molded part having a concave cavity according to claim 2, characterized in that: The core pulling assembly also includes two limit cover plates, which are fixedly mounted on the core pulling slider and are respectively located above the first strip groove and the second strip groove to close the first strip groove and the second strip groove.

4. The molding die for an injection molded part having a concave cavity according to claim 1, characterized in that: The cross-sectional shapes of the first channel and the second channel are both polygonal structures.

5. The molding die for an injection molded part having a concave cavity according to claim 1, characterized in that: The first core-pulling rod has two first arc-shaped concave holes spaced apart from each other; a center line connecting the two first arc-shaped concave holes is parallel to the length direction of the first core-pulling rod; The core pulling assembly further comprises a first spring column plug, which is mounted on the core pulling slider and is used for concave-convex cooperation with the two first arc-shaped concave holes; When the first limiting column abuts against one end of the first strip groove close to the forming portion, the first spring column head plug cooperates with one of the first arc-shaped recessed holes; when the first limiting column abuts against one end of the first strip groove away from the forming portion, the first spring column head plug cooperates with another of the first arc-shaped recessed holes.

6. The molding die for an injection molded part having a concave cavity according to claim 1, characterized in that: The second limiting column has two second arc-shaped concave holes spaced apart from each other; a center line connecting the two second arc-shaped concave holes is parallel to the length direction of the second limiting column; The core pulling assembly further comprises a second spring column plug, which is mounted on the core pulling slider and is used for concave-convex cooperation with the two second arc-shaped concave holes; When the second limiting column abuts against one end of the second strip groove close to the forming portion, the second spring column head plug cooperates with one of the second arc-shaped recessed holes; when the second limiting column abuts against one end of the second strip groove away from the forming portion, the second spring column head plug cooperates with another of the second arc-shaped recessed holes.

7. The molding die for an injection molded part having a concave cavity according to claim 1, characterized in that: The fixed mold is provided with a T-shaped slide groove, and the bottom of the core-pulling slider has a T-shaped structure matched with the T-shaped slide groove.

8. The molding die for an injection molded part having a concave cavity according to claim 1, characterized in that: The core pulling assembly also includes an inclined guide column, which is fixedly mounted on the movable mold and inserted into the core pulling slider. The inclined guide column drives the core pulling slider to move during the mold opening and closing process.

9. The molding die for an injection molded part having a concave cavity according to claim 8, characterized in that: A water transport circuit is provided in the core-pulling slider, and the inlet and outlet of the water transport circuit are located at the bottom of the core-pulling slider; the inlet and outlet of the water transport circuit are both connected with an L-shaped joint, and the L-shaped joint is externally connected with a water pipe; The fixed mold is provided with two strip-shaped through grooves which are arranged side by side and at intervals, so as to allow the L-shaped tube and the water pipe to be installed.

10. The molding die for an injection molded part having a concave cavity according to claim 1, characterized in that: The molding mold for the injection molded part with a concave cavity also includes a straight ejector assembly for vertically ejecting the injection molded part; the straight ejector assembly includes a straight ejector pin and an ejector pin plate, the ejector pin plate is vertically movably arranged below the fixed mold, the bottom of the straight ejector pin is fixed on the ejector pin plate, and the straight ejector pin is penetrated through the fixed mold.

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