Exhaust insert special for improving air trapping of injection mold

Abstract

The utility model provides a special exhaust insert for improving air trapping of an injection mold, which relates to the technical field of injection molding and comprises an insert body, an exhaust structure is arranged in the insert body, and a protruding hanging table is arranged at the bottom of the insert body. And the insert pressing block is provided with a fixing structure connected with a mold, the insert pressing block is separated from the insert body, a concave pressing groove is formed in the bottom of the insert pressing block, and the hanging table can be inserted into the pressing groove. According to the utility model, the insert body and the insert pressing block which are separated from each other are adopted, can be respectively processed, and are assembled when being used, so that the effect of being easy to process and install is realized. The hanging table is arranged at the bottom of the insert body, and the pressing groove is formed in the bottom of the insert pressing block, so that during mounting, only the insert body needs to be embedded into the position where air trapping is prone to occurring, then the insert pressing block only needs to be fixedly connected with a mold, the hanging table of the insert body can be pressed on the mold through the groove of the insert pressing block, and therefore the insert is fixed; the installation mode and the installation structure are simple and fast.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molding, in particular to an exhaust insert specially used for improving air entrapment in injection molds. Background Art

[0002] As one of the eight major systems in an injection mold, the exhaust system plays a crucial role. During the injection molding process, good exhaust performance guides the flow of hot-melt resin during filling. Poor exhaust performance, on the other hand, can lead to product issues such as difficulty filling the mold cavity, burning, and weld lines. Optimizing exhaust helps guide the flow of hot-melt resin within the mold cavity, which can, to a certain extent, not only avoid product issues and improve product quality, but also increase production efficiency.

[0003] During the production process, hot melt resin is injected into the mold from the hot injection nozzle and flows to a certain area where it collects. If gas cannot escape from this area, it will form trapped air (termed as cavitation), which can cause material shortages in this area. Therefore, strengthening the venting performance in this area can not only guide the filling of the rubber in the mold cavity and improve production efficiency, but also avoid product problems.

[0004] Some existing technologies use vent inserts to address mold air trapping. For example, Chinese patent CN219405263U, published on July 25, 2023, and a mold vent insert, published on April 11, 2023, utilize multiple stacked vent inserts to quickly and efficiently vent gas from the mold cavity.

[0005] However, in this type of prior art, the insert structure and the fixed structure are integrally formed, which is difficult to manufacture and complex to install. Furthermore, the fixed structure does not need to participate in exhaust, but is made of the same material as the insert structure (and the high quality of the template), resulting in waste and increased costs. Utility Model Content

[0006] The purpose of the utility model is to provide a special exhaust insert for improving the trapped gas in injection molds, which can help to efficiently guide the gas out, and has a simple structure, is easy to process and install;

[0007] The utility model provides a venting insert specially used for improving air entrapment in injection molds, comprising: an insert body, wherein an venting structure is provided in the insert body, and a protruding hanging platform is provided at the bottom of the insert body; an insert pressing block, wherein a fixing structure connected to the mold is provided on the insert pressing block, the insert pressing block is separated from the insert body, and a concave pressing groove is provided at the bottom of the insert pressing block, and the hanging platform can be inserted into the pressing groove.

[0008] Furthermore, the insert body includes a plurality of sheets, and the plurality of sheets are stacked and connected by a connector. The exhaust structure includes gaps between adjacent sheets, and the hanging platforms are respectively provided on the same side of the bottom of the sheets.

[0009] Furthermore, the connecting member includes a pin, and pin holes are opened at the same position on the plurality of sheets, and the pins are inserted into the pin holes.

[0010] Furthermore, the insert pressing block includes a pressing block, and the fixing structure includes a screw and a screw hole opened on the pressing block; the screw is inserted into the screw hole and connected to the mold.

[0011] Furthermore, the hanging platform is pressed between the pressing groove and the mold.

[0012] Furthermore, the hanging platform and the insert body form an L-shaped structure, and the pressing groove and the insert pressing block form an inverted L-shaped structure.

[0013] Furthermore, the insert body is embedded in the mold and contacts the air-trapping position, and the outer side of the insert body is consistent with the outer contour of the mold.

[0014] Furthermore, the insert pressing block is embedded in the mold, and the outer side of the insert pressing block is the same as the outer contour of the mold.

[0015] Furthermore, the insert body and the mold are made of the same material.

[0016] Furthermore, the insert pressing block and the insert body are made of the same material or different materials.

[0017] The technical solution of the utility model adopts a separate insert body and insert pressing block, so that during processing and manufacturing, the insert body and the insert pressing block can be processed separately and then assembled when in use, thereby achieving the effect of easy processing and installation. In addition, by providing a hanging platform at the bottom of the insert body and a pressing groove at the bottom of the insert pressing block, during installation, it is only necessary to embed the insert body into the position where air entrapment is likely to occur, and then only need to fix the insert pressing block to the mold. The groove of the insert pressing block can press the hanging platform of the insert body onto the mold, thereby achieving the fixation of the insert. The installation method and installation structure are simple and fast. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 This is a schematic diagram of the exhaust insert structure of the utility model;

[0020] Figure 2 This is a schematic structural diagram of the exhaust insert of the present invention from another perspective;

[0021] Figure 3 This is a schematic structural diagram of the exhaust insert of the present invention from another perspective;

[0022] Figure 4 This is a top view of the exhaust insert of the present invention;

[0023] Figure 5 For this utility model Figure 4 AA section view;

[0024] Figure 6 This is a front view of the exhaust insert of the present utility model;

[0025] Figure 7 For this utility model Figure 6 BB cross-sectional view;

[0026] Figure 8 This is a schematic diagram of the exhaust insert in Example 5 of the present utility model before being processed according to the mold outline;

[0027] Description of reference numerals:

[0028] 1-Insert body; 101-Leaf; 102-Exhaust structure; 103-Hanging platform; 104-Pin; 105-Pin hole;

[0029] 2-insert pressing block; 201-pressing block; 202-screw; 203-screw hole; 204-pressing groove. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments. Obviously, the embodiments described are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present utility model, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a communication between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

[0033] Example 1

[0034] like Figures 1-7 As shown, the utility model provides a venting insert specially used for improving air entrapment in injection molds, comprising: an insert body 1, in which an venting structure 102 is provided, and a protruding hanging platform 103 is provided at the bottom of the insert body 1; an insert pressing block 2, on which a fixing structure connected to the mold is provided, the insert pressing block 2 is separated from the insert body 1, and a concave pressing groove 204 is provided at the bottom of the insert pressing block 2, and the hanging platform 103 can be inserted into the pressing groove 204.

[0035] Specifically, the structure of the insert body 1 can be the stacked structure of the sheets 101 in Example 2 of the present invention, or other insert structures in the prior art (such as a pin-type insert).

[0036] In this embodiment, the insert body 1 and the insert block 2 are separate structures and are processed independently during manufacturing. For example, the pages 101 of the insert body 1 can be cut and stacked independently, and the fixing structure (screw hole 203) of the insert block 2 can also be processed independently. As in Example 5, when the insert body 1 and the insert block 2 need to be processed into a structure that fits the shape of the mold surface, the two parts can also be processed separately without interfering with each other, so that the processing process is more separate.

[0037] In this embodiment, the insert body 1 and the insert pressing block 2 are separate structures. During use, one side of the insert body 1 is inserted into the mold template and contacts the trapped air location within the mold cavity to vent air. The other side is exposed, and a hanging platform 103 protruding from the mold is provided on this exposed side. The insert pressing block 2 is positioned outside the mold, where the insert body 1 is located. The insert pressing block 2 is fixedly connected to the mold via a fixing structure, and the pressing groove 204 of the insert pressing block 2 presses the hanging platform 103 against the mold, thereby securing the insert. The installation method and installation structure are simple and quick.

[0038] Example 2

[0039] The insert body 1 comprises a plurality of panels 101, which are stacked and connected by connectors. The exhaust structure 102 comprises gaps between adjacent panels 101, and a hanger 103 is provided on the same side of the bottom of each panel 101. The connectors comprise pins 104, and pin holes 105 are provided at the same position on each panel 101. The pins 104 are inserted into these holes.

[0040] Specifically, in this embodiment, the insert body 1 is composed of several sheets of steel material spliced ​​together by pins 104. These sheets 101 are individually separated, each provided with a pin hole 105. A pin 104 passes through these pin holes 105, thereby connecting the sheets 101 together and forming a stack. The pin 104 prevents the sheets 101 from shifting or misaligning within at least two dimensions (their own planes). Furthermore, because the insert is tightly secured to the insert slot and constrained by the degrees of freedom granted by both the slot and the insert block, the pin further enhances the stability of the insert body.

[0041] The small hanging platforms 103 on all the leaf pieces 101 are arranged side by side to form a long step structure, which are all embedded in the pressing groove 204 of the insert pressing block 2.

[0042] Example 3

[0043] The insert pressing block 2 includes a pressing block 201 , and the fixing structure includes a screw 202 and a screw hole 203 provided on the pressing block 201 ; the screw 202 is inserted into the screw hole 203 and connected to the mold.

[0044] Specifically, in this embodiment, a screw hole 203 is provided through the compression block 201. The screw hole 203 is a countersunk structure, and the screw 202 is specifically a cup-head screw. The cup-head screw is inserted into the screw hole 203 and the end of the cup-head screw extends out to connect with the mold, thereby fixing the compression block 201 to the mold. After removing the screw 202, the compression block 201 can be removed and the insert body 1 can be removed.

[0045] Example 4

[0046] The hanging platform 103 is pressed between the pressing groove 204 and the mold. The hanging platform 103 and the insert body 1 form an L-shaped structure, and the pressing groove 204 and the insert pressing block 2 form an inverted L-shaped structure.

[0047] Specifically, in this embodiment, the hanging platform 103 is a rectangular parallelepiped structure. The hanging platforms 103 of all the leaf pieces 101 are arranged side by side to form an L-shaped stepped structure with the side surfaces of the leaf pieces 101. The pressing groove 204 is recessed into the side surface of the pressing block 201 adjacent to / in contact with the leaf pieces 101, and forms an inverted L-shaped structure with the side surface of the pressing block 201. Due to the angular shape of the hanging platform 103, the pressing block 201 can stably press the insert body 1 composed of the leaf pieces 101.

[0048] Example 5

[0049] The insert body 1 is embedded in the mold and contacts the air trapping position. The outer side of the insert body 1 is the same as the mold's outer contour. The insert block 2 is embedded in the mold (the mold has a groove but does not penetrate into the mold cavity). The outer side of the insert block 2 is the same as the mold's outer contour.

[0050] Specifically, in this embodiment, the sheet 101 and the pressing block 201 are conventional profiles (such as Figure 8 As shown), when used for different molds, it is processed into a shape that fits the mold surface contour so that it can be smoothly connected with the mold peripheral surface (as shown Figures 1-7 The specific process is as follows:

[0051] (1) Find the area in the mold cavity where trapped air (difficulty filling) occurs and where the vent insert needs to be set. Divide the effective coverage range of the insert and pre-design the insert shape according to the conventional method. Divide the pre-designed insert into two parts. The part close to the glue position is the insert body 1, and the part away from the glue position is the insert block 2.

[0052] (2) Two square steel pieces are selected, one of which is used as the insert body 1 (the insert shape is set to a rectangular shape, and the size is set to an integer size that is easy to divide equally. Taking a certain product as an example, the insert thickness is set to 20 mm, so that it can be divided into five equal parts, that is, each sheet is 4 mm thick). It is split into the shape of several sheets according to the processing conditions, and a hanging platform 103 is processed on the outer side of the bottom, and the pin 104 is fixed inside; the other one is used as the insert pressing block 2, and a pressing groove 204 is processed on the inner side of the bottom, and screw holes are processed at the same time.

[0053] (3) According to the surface contour of the mold, firstly, the contours of the insert body 1 and the insert block 2 except the glue surface and the parting surface are processed separately, and the steel material margin is left on the glue surface and the parting surface; then the whole set of exhaust inserts are fixed in the insert slot of the template by cup head screws, and the exhaust inserts and the corresponding surrounding areas of the template are assembled and processed by CNC machine tools, and finally manually ground by benchwork to match with the surrounding mold contour surface.

[0054] That is, in this embodiment, the insert is not limited to Figures 1-7 Figures 1-7 The size of the medium mold can be freely adjusted and processed into a shape suitable for the area where the exhaust needs to be improved in the mold cavity.

[0055] Example 6

[0056] The insert body 1 and the mold are made of the same material. The insert pressing block 2 and the insert body 1 are made of the same material or different materials.

[0057] Specifically, in this embodiment, the sheet-like steel material constituting the insert body 1 is made of the same material as the corresponding mold plate to ensure the molding effect. Since the insert pressing block 2 is separated from the insert body 1, the pressing block 201 can be made of ordinary mold steel, saving material costs.

[0058] The usage and principle of this utility model:

[0059] The insert body 1 is composed of several stacked leaves 101, while the insert pressure block 2 consists of a pressure block 201 and bolts. The insert body 1 and pressure block 2 are designed to be separate, allowing them to be machined separately during manufacturing and then assembled for ease of processing and installation. The leaves can be made of the same material as the corresponding mold plate to ensure effective molding. Since the pressure block 2 is separate from the insert body 1, the pressure block 201 can be made of ordinary mold steel, saving material costs. Furthermore, by providing a hanging platform 103 at the bottom of the leaves 101 and a pressing groove 204 at the bottom of the pressure block 201, installation requires only inserting the insert body 1 into the area prone to air entrapment. Then, the pressure block 201 is securely connected to the mold. The groove in the pressure block 201 presses the hanging platform 103 of the insert body 1 against the mold, securing the insert. The installation method and structure are simple and quick.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A vent insert specifically for improving air entrapment in injection molds, characterized in that: include: An insert body, wherein an exhaust structure is provided in the insert body, and a protruding hanging platform is provided at the bottom of the insert body; An insert pressing block is provided with a fixing structure connected to the mold, the insert pressing block is separated from the insert body, and a concave pressing groove is provided at the bottom of the insert pressing block, and the hanging platform can be inserted into the pressing groove.

2. The vent insert for improving air entrapment in injection molds according to claim 1, characterized in that: The insert body includes a plurality of sheets, which are stacked and connected via connectors. The exhaust structure includes gaps between adjacent sheets, and the hanging platforms are respectively provided on the same side of the bottom of the sheets.

3. The vent insert for improving air entrapment in injection molds according to claim 2, characterized in that: The connecting piece includes a pin, and pin holes are opened at the same position on a plurality of the sheets, and the pins are inserted into the pin holes.

4. The vent insert for improving air entrapment in injection molds according to claim 1, characterized in that: The insert pressing block includes a pressing block, and the fixing structure includes a screw and a screw hole provided on the pressing block; the screw is inserted into the screw hole and connected to the mold.

5. The vent insert for improving air entrapment in injection molds according to claim 1, characterized in that: The hanging platform is pressed between the pressing groove and the mold.

6. The vent insert for improving air entrapment in injection molds according to claim 5, characterized in that: An L-shaped structure is formed between the hanging platform and the insert body, and an inverted L-shaped structure is formed between the pressing groove and the insert pressing block.

7. The vent insert for improving air entrapment in injection molds according to claim 1, characterized in that: The insert body is embedded in the mold and contacts the air-trapping position, and the outer side of the insert body is consistent with the outer contour of the mold.

8. The vent insert for improving air entrapment in injection molds according to claim 1, characterized in that: The insert pressing block is embedded in the mold, and the outer side of the insert pressing block is consistent with the outer contour of the mold.

9. The vent insert for improving air entrapment in injection molds according to claim 1, characterized in that: The insert body and the mold are made of the same material.

10. The vent insert for improving air entrapment in injection molds according to claim 9, characterized in that: The insert pressing block and the insert body are made of the same material or different materials.

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