Secondary ejection structure of injection mold

Abstract

The utility model relates to the technical field of injection mold equipment, in particular to a secondary ejection structure of an injection mold, which adopts the technical scheme that the secondary ejection structure comprises a lower mold, the top surface of the lower mold is provided with a mold cavity for forming an injection molding part, the lower mold is provided with a mounting hole penetrating through the lower mold along the central axis of the mold cavity, and the mounting hole is communicated with the mold cavity; a sleeve is connected into the mounting hole in an inserting and pulling mode, an inserting end is arranged at one end of the top of the sleeve, a narrow cavity is formed between the peripheral wall of the inserting end and the inner wall of the mold cavity and communicated with the mold cavity, a through hole penetrating through the sleeve is formed in the sleeve along the central axis, and an ejector rod movably penetrates through the through hole. The mounting hole communicated with the mold cavity is formed in the bottom surface of the lower mold, and the sleeve is arranged in the mounting hole, so that when the ejector rod is ejected out, the ejector rod moves along the through hole in the central axis of the sleeve, the ejection and demolding actions are more stable, and the situation that the ejector rod deflects an injection molding part to cause deformation of the injection molding part is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of injection mold equipment, in particular to a secondary ejection structure of an injection mold. Background Art

[0002] An injection mold is a tool for producing plastic products. An injection molding machine injects molten plastic into the mold cavity of a mold core under high pressure and forms it after cooling. It is a processing method used in mass production of certain parts with complex shapes. The secondary ejection structure in the prior art has a too long stroke and lacks a guide structure, which can easily cause the molded part to deviate from the mold cavity and escape during ejection, causing deformation of the molded part. In addition, the injection molding machine has a single purpose and can only be used for demolding the molded part after molding.

[0003] In view of this, we propose a secondary ejection structure of the injection mold to solve the existing problems. Utility Model Content

[0004] The utility model aims to provide a secondary ejection structure of an injection mold to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a secondary ejection structure of an injection mold, comprising a lower mold, a mold cavity for molding an injection molded part is provided on the top surface of the lower mold, a mounting hole penetrating the lower mold is provided along the central axis of the mold cavity, the mounting hole is communicated with the mold cavity, a sleeve is plugged in and connected to the mounting hole, a plug-in end is provided at one end of the top of the sleeve, a narrow cavity is formed between the outer peripheral wall of the plug-in end and the inner wall of the mold cavity, the narrow cavity is communicated with the mold cavity, a through hole penetrating the sleeve is provided along the central axis of the sleeve, a ejector rod is movably inserted in the through hole.

[0006] Preferably, the mounting hole is a truncated cone-shaped hole whose diameter gradually narrows from bottom to top, and the plug-in end of the sleeve is a truncated cone-shaped plug-in structure corresponding to the shape of the mounting hole.

[0007] Preferably, the top surface of the sleeve, the top surface of the ejector rod and the top surface of the lower mold are on the same horizontal line.

[0008] Preferably, a first connecting piece is provided at one end of the bottom of the sleeve, and a driving device is connected via the first connecting piece.

[0009] Preferably, the first connecting member is an annular protrusion circumferentially arranged on the outer wall of the bottom of the sleeve, and a stop surface is provided on the side end surface of the annular protrusion.

[0010] Preferably, the push rod includes a rod body that can be movably inserted into the through hole, and the length of the rod body is at least twice the length of the sleeve.

[0011] Preferably, a second connecting piece for connecting to a driving cylinder is also provided at one end of the bottom of the push rod.

[0012] Preferably, the second connecting member is an annular protrusion arranged around the outer wall of the bottom of the shaft.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] The utility model provides a mounting hole connected to the mold cavity on the bottom surface of the lower mold, and a sleeve is provided in the mounting hole, so that when the ejector rod is ejected, the ejector rod moves along the through hole of the central axis of the sleeve, so that the ejection and demoulding action is more stable, and the ejector rod is prevented from deviating from the injection molded part and causing deformation of the injection molded part.

[0015] The utility model provides a mounting hole connected to the mold cavity on the bottom surface of the lower mold, and a sleeve is provided in the mounting hole. A narrow cavity is formed between the outer wall of the sleeve and the inner wall of the mold cavity, so that the sleeve and the mold cavity cooperate to form a thin-walled contour of the bottom surface of the injection molded part. After the sleeve is worn, the shape and size of the narrow cavity between the outer wall of the sleeve and the inner wall of the mold cavity can be guaranteed to meet the injection molding requirements of the injection molded part by replacing the sleeve, thereby avoiding the whole mold core being unusable due to damage of the thin-walled contour in the mold cavity when a conventional mold is used, which causes waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0017] Figure 2 It is a schematic diagram of the three-dimensional cutaway structure of the utility model;

[0018] Figure 3 It is a schematic diagram of the cross-sectional structure of the utility model.

[0019] In the figure: 1, lower mold; 101, mold cavity; 102, mounting hole; 2, sleeve; 201, plug-in end; 202, through hole; 203, first connecting piece; 3, ejector rod; 301, second connecting piece; 4, narrow cavity. DETAILED DESCRIPTION

[0020] The technical solution of the utility model is further described below in conjunction with the accompanying drawings and specific embodiments. Example

[0021] like Figure 1 , Figure 2 and Figure 3As shown, the utility model proposes a secondary ejection structure of an injection mold, including a lower mold 1, a mold cavity 101 for molding an injection molded part is provided on the top surface of the lower mold 1, a mounting hole 102 penetrating the lower mold 1 is provided along the central axis of the mold cavity 101, the mounting hole 102 is communicated with the mold cavity 101, a sleeve 2 is plugged in and connected in the mounting hole 102, a plug-in end 201 is provided at one end of the top of the sleeve 2, and the outer peripheral wall of the plug-in end 201 is connected to the inner wall of the mold cavity 101 A narrow cavity 4 is formed between the two surfaces, and the narrow cavity 4 is connected to the mold cavity 101, and is used to form a thin-walled structure of the injection molded part during injection molding. The sleeve 2 is provided with a through hole 202 penetrating the sleeve 2 along the central axis, and a push rod 3 is movably inserted in the through hole 202 to guide the push rod 3. During injection molding, the bottom end surface of the mold cavity 101 is closed by the sleeve 2 and the push rod 3 arranged in the mounting hole 102. After the injection molded part is formed, the push rod 3 passes through the top surface of the sleeve 2 to eject the injection molded part out of the mold.

[0022] In the embodiment, the mounting hole 102 is a truncated cone-shaped hole whose diameter gradually narrows from bottom to top, and the plug-in end 201 of the sleeve 2 is a truncated cone-shaped plug-in structure corresponding to the shape of the mounting hole 102, which is used to fix the sleeve 2 in the mounting hole 102 by fitting and abutting between the outer peripheral wall of the plug-in end 201 and the inside of the mounting hole 102.

[0023] In the embodiment, the top surface of the sleeve 2 , the top surface of the ejector pin 3 , and the top surface of the lower mold 1 are on the same horizontal line.

[0024] In the embodiment, a first connecting member 203 is provided at one end of the bottom of the sleeve 2 , and a driving device is connected via the first connecting member 203 .

[0025] In the embodiment, the first connecting member 203 is an annular protrusion circumferentially arranged on the outer wall of the bottom of the sleeve 2, and a stop surface is provided on the side end surface of the annular protrusion.

[0026] In an embodiment, the top rod 3 includes a rod body that can be movably inserted into the through hole 202 , and the length of the rod body is at least twice the length of the sleeve 2 .

[0027] In the embodiment, a second connecting member 301 for connecting to a driving cylinder is further provided at one end of the bottom of the top rod 3 .

[0028] In the embodiment, the second connecting member 301 is an annular protrusion disposed around the outer wall of the bottom of the shaft.

[0029] The working principle of the secondary ejection structure of an injection mold based on the first embodiment is as follows: when the utility model is in use, the sleeve 2 is connected to the lower mold 1 through the plug-in end 201 of the sleeve 2, and a narrow cavity 4 is formed between the outer peripheral wall on the top side of the plug-in end 201 and the inner wall of the mold cavity 101 of the lower mold 1, and the narrow cavity 4 is connected to the mold cavity 101 to form the shape of one end of the bottom of the injection molded part, and a through hole 202 is provided in the center of the sleeve 2, and a push rod 3 is inserted in the through hole 202, and the bottom of the sleeve 2 is connected to a drive rod 3 through a first connecting member 203. The driving device is used, and one end of the bottom of the ejector rod 3 is connected to a driving cylinder through a second connecting piece 301; during injection molding, the molten plastic is injected into the mold cavity 101 and the narrow cavity 4 by the injection molding machine, and is shaped after cooling. During demoulding, the upper mold and the lower mold 1 of the mold are separated, so that the mold cavity 101 is in a top open state, and the ejector rod 3 is pushed up by the output end of the driving cylinder, so that the top end surface of the ejector rod 3 abuts against the bottom end surface of the injection molded part after molding. The ejector rod 3 continues to rise under the push of the driving cylinder to push the injection molded part out of the mold cavity 101 to achieve demoulding.

[0030] The above-mentioned specific embodiments are only several preferred embodiments of the present invention. Based on the technical solution of the present invention and the relevant inspiration of the above-mentioned embodiments, those skilled in the art can make various alternative improvements and combinations to the above-mentioned specific embodiments.

Claims

1. A secondary ejection structure of an injection mold, comprising a lower mold (1), characterized in that: The top surface of the lower mold (1) is provided with a mold cavity (101) for molding an injection molded part. The lower mold (1) is provided with a mounting hole (102) penetrating the lower mold (1) along the central axis of the mold cavity (101). The mounting hole (102) is connected to the mold cavity (101). A sleeve (2) is plugged in and out of the mounting hole (102). A plug-in end (201) is provided at the top end of the sleeve (2). A narrow cavity (4) is formed between the outer peripheral wall of the plug-in end (201) and the inner wall of the mold cavity (101). The narrow cavity (4) is connected to the mold cavity (101). The sleeve (2) is provided with a through hole (202) penetrating the sleeve (2) along the central axis. A push rod (3) is movably inserted into the through hole (202).

2. The secondary ejection structure of an injection mold according to claim 1, characterized in that: The mounting hole (102) is a truncated cone-shaped hole whose diameter gradually narrows from bottom to top, and the plug-in end (201) of the sleeve (2) is a truncated cone-shaped plug-in structure corresponding to the shape of the mounting hole (102).

3. The secondary ejection structure of an injection mold according to claim 2, characterized in that: The top surface of the sleeve (2), the top surface of the ejector rod (3) and the top surface of the lower mold (1) are on the same horizontal line.

4. The secondary ejection structure of an injection mold according to claim 3, characterized in that: A first connecting member (203) is provided at one end of the bottom of the sleeve (2), and a driving device is connected via the first connecting member (203).

5. The secondary ejection structure of an injection mold according to claim 4, characterized in that: The first connecting member (203) is an annular protrusion arranged around the outer wall of the bottom of the sleeve (2), and a stop surface is provided on the side end surface of the annular protrusion.

6. The secondary ejection structure of an injection mold according to claim 1, characterized in that: The push rod (3) comprises a rod body that can be movably inserted into the through hole (202), and the length of the rod body is at least twice the length of the sleeve (2).

7. The secondary ejection structure of an injection mold according to claim 6, characterized in that: A second connecting piece (301) for connecting to a driving cylinder is also provided at one end of the bottom of the push rod (3).

8. The secondary ejection structure of an injection mold according to claim 7, characterized in that: The second connecting member (301) is an annular protrusion arranged around the outer wall of the bottom of the shaft.

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