Exhaust structure of injection mold

Abstract

The application provides an exhaust structure of an injection mold, and belongs to the technical field of molds. The technical problem of the installation quality of the exhaust insert of the exhaust structure of the existing injection mold being difficult to guarantee is solved. In the exhaust structure of the injection mold, the injection mold comprises an insert block, the exhaust structure comprises a plurality of exhaust inserts and a containing groove located at the top of the insert block, the plurality of exhaust inserts are embedded in the containing groove and abut against the bottom surface of the containing groove, the bottom surface of the containing groove is provided with a vertical through air hole, a pull rod connected with the exhaust insert at the upper end is inserted into the air hole, the outer circumferential surface of the pull rod is provided with a guide inclined surface arranged vertically upward, the insert block is further provided with a fastener and a positioning block capable of sliding along the horizontal direction to the pull rod during the fastening process of the fastener, and the positioning block is vertically limited and abuts against the guide inclined surface. The application is beneficial to guaranteeing the installation quality of the thin plate exhaust insert.

Description

Technical Field

[0001] The invention belongs to the technical field of molds and relates to an exhaust structure of an injection mold. Background Art

[0002] Injection molds are becoming increasingly complex and shaped, posing significant challenges to product injection molding. Among the many product defects, air entrapment is a common and difficult problem to resolve. Trapped air, due to compression, heats up, potentially burning the product. Furthermore, air entrapment can cause short shots and prevent molding. Finally, air entrapment can also lead to defects such as excessive injection pressure and poor product bonding. While optimizing the product's wall thickness can partially mitigate this issue, the potential for improvement is limited.

[0003] The patent with authorization announcement number CN208305701U discloses an exhaust insert and an exhaust insert mounting structure for an injection mold. The exhaust insert includes an insert base and an exhaust insert. The insert base is provided with a plurality of parallel left and right extending through grooves. An exhaust insert is gap-fitted in each through groove. The insert base and the exhaust insert are relatively fixed by front and rear through pins. An exhaust groove is provided on one or both side walls of the exhaust insert. A plurality of exhaust holes are provided in the insert base. Each exhaust hole penetrates at least one side wall of the through groove, and its opening on the side wall of the through groove is communicated with the exhaust groove. A plurality of screw holes are provided in the insert base. The orifices of the screw holes are located on the bottom surface of the insert base, and each exhaust hole is communicated with at least one screw hole.

[0004] The above structure can alleviate the problem of trapped air. However, for automobile injection-molded parts with complex structures, considering the special modeling needs, a narrow and thin plate-shaped exhaust panel will be provided for molding and solving the problem of trapped air at the same time. However, when the thin plate-shaped exhaust panel is installed into the narrow and long receiving groove, it is often difficult to assemble it into place due to friction and size. For this reason, general technicians in this field can easily consider the following: 1. Install multiple exhaust panels in sequence, and slowly knock the last exhaust panel with a soft hammer to embed it; 2. Apply lubricating oil on the outer surface of the exhaust panel or use a material with a low friction coefficient to reduce friction; 3. Design the exhaust panel into a wedge shape to reduce the difficulty of insertion. Summary of the Invention

[0005] In view of the above problems existing in the prior art, the present invention provides an exhaust structure for an injection mold. The technical problem to be solved by the present invention is: how to ensure the installation quality of the thin plate exhaust insert.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A venting structure for an injection mold, the injection mold includes an insert, the venting structure includes a plurality of venting inserts and a receiving groove located on the top of the insert, the plurality of venting inserts are embedded in the receiving groove and abut against the bottom surface of the receiving groove, the bottom surface of the receiving groove has a vertically through vent hole, and is characterized in that a pull rod connected to the upper end of the exhaust insert is inserted into the vent hole, the outer peripheral surface of the pull rod has a guide inclined surface arranged vertically upward, the insert is also provided with a fastener and a positioning block that can slide horizontally toward the pull rod during the tightening of the fastener, and the positioning block and the guide inclined surface abut against each other along the vertical limit.

[0008] The exhaust insert is inserted in the receiving groove of the insert, which can be embedded in the mold and the surface of the exhaust insert can participate in the molding of the injection molded part. Air and water vapor can be discharged from the gap between the exhaust inserts and between the exhaust insert and the insert and the mold. The vents on the bottom of the receiving groove can allow air and water vapor to be discharged out of the insert; a pull rod is inserted into the vent hole so that the upper end of the pull rod is connected to the exhaust insert, and a guide slope is set on the outer periphery of the lower end of the pull rod. Air can be discharged downward along the gap between the pull rod and the inner wall of the vent hole. Fasteners and positioning blocks are set in the insert. The fasteners are tightened and one end of the positioning block cooperates with the guide slope along the vertical limit to fix the position of the pull rod. In this way, when installing the exhaust insert, the upper end of the pull rod can be connected to the exhaust insert first, and then the exhaust insert can be pre-inserted into the receiving groove from top to bottom, and the pull rod can be inserted into the vent. Since it is difficult to directly insert it into place, the lower part of the guide slope on the pull rod will be opposite to the positioning block, and then the fastener is tightened so that one end of the positioning block is against the guide slope and gradually fed toward the pull rod, and then the pull rod is driven to move downward through the guide slope and the exhaust insert is pulled down into place. During the whole process, the molding surface of the exhaust insert will not be directly subjected to force, and the pull rod only applies a simple downward force to the exhaust insert, thereby avoiding the thin plate-like exhaust insert from being bent by torque and ensuring the installation quality.

[0009] In the exhaust structure of the above-mentioned injection mold, the bottom surface of the insert has a mounting groove connected to the vent hole, and the mounting groove is embedded with a clamping block and the positioning block. The clamping block is connected to the insert by a vertically penetrating fastener and the positioning block is pressed on the bottom surface of the mounting groove. The end of the positioning block away from the pull rod has a force-bearing inclined surface arranged vertically downward, and the outer periphery of the clamping block has a force-applying inclined surface that fits the force-bearing inclined surface. In this way, the clamping block and the positioning block are both arranged in the limit groove. The clamping block can be gradually pressed upward under the action of the vertical fastener, and then the relative movement between the force-applying inclined surface and the force-bearing inclined surface is obtained to more stably squeeze the positioning block to move horizontally. At the same time, the positioning block is stabilized by the vertical constraint of the clamping block. Moreover, since the upper end of the clamping block is a small end, the positioning block has enough lateral movement space before being tightened, which ensures the portability and installation accuracy of the installation and improves the installation quality.

[0010] In the aforementioned venting structure of the injection mold, the lower outer surface of the tie rod has a positioning notch, the guiding slope is located on the lower side of the inner wall of the positioning notch, and the positioning block is positioned and embedded in the positioning notch. This allows the positioning block to abut against the upper and lower inner walls of the positioning notch simultaneously, ensuring proper surface assembly and ensuring accurate installation of the vent insert.

[0011] In the aforementioned venting structure of the injection mold, the plurality of tie rods are spaced apart along the direction in which the venting insert is installed. This allows a thin venting insert to be installed in place by pulling the tie rods at different locations, thereby reducing the likelihood of deformation of the venting insert during insertion.

[0012] In the aforementioned venting structure of the injection mold, there are multiple venting inserts, each of which has a T-shaped limit groove on its bottom side. The upper end of the tie rod is embedded in the limit groove and vertically limits the position of the venting insert. This allows the upper end of the tie rod to be embedded in multiple limit grooves simultaneously along the horizontal direction, achieving convenient connection. At the same time, the force exerted by the upper end of the tie rod on the inner wall of the limit groove is more uniform.

[0013] In the exhaust structure of the above-mentioned injection mold, a positioning pin is provided on the side of the exhaust insert. The positioning pin is arranged in a position offset from the position of the limiting groove along the installation direction of the exhaust insert, and the end face of the positioning pin is coplanar with the surface of the exhaust insert. In this way, the positioning pin can constrain multiple exhaust inserts and cooperate with the tie rod to enhance their overall strength, thereby preventing vertical misalignment during the insertion process.

[0014] In the exhaust structure of the injection mold, the edge of the receiving groove is excessively chamfered, which can reduce the probability of scratches caused by the large force between the exhaust panel and the edge of the receiving groove when the exhaust panel is tightened into place.

[0015] In the aforementioned venting structure of the injection mold, the vertical sides of the venting insert are parallel to the tie rod, which is a flat, straight rod with a thickness smaller than the width of the receiving groove. This allows the tie rod to be assembled before the venting insert and then inserted into the receiving groove, thus reducing the difficulty of installation.

[0016] In the aforementioned venting structure of the injection mold, the positioning notches on the two adjacent tie rods are oriented in opposite directions in the transverse direction. This allows the adjacent tie rods to receive opposite transverse forces from the positioning block, thereby preventing the vent insert from being displaced toward the same end by the uniform transverse force of the tie rods during insertion, thereby ensuring a secure installation.

[0017] In the aforementioned venting structure of the injection mold, one end of the positioning block is pointed and shaped to match the positioning notch. The bottom surface of one end of the positioning block is in contact with the guide bevel. This allows the bottom surface of the positioning block to remain in contact with the guide bevel as the end of the positioning block is inserted into the positioning notch along the guide bevel. This increases the force-bearing surface, reduces wear and tear, and ensures smooth and precise installation of the venting insert.

[0018] In the aforementioned injection mold's venting structure, the compression block is circumferentially positioned within the mounting groove, abutting against the bottom surface of the mounting groove. This allows the compression block to maintain a stable angle after being installed in the mounting groove, thereby ensuring a stable interaction between the force-applying and force-receiving inclined surfaces. This in turn pushes the positioning block toward the pull rod, ensuring a stable installation.

[0019] In the aforementioned venting structure for the injection mold, one end face of the positioning block simultaneously abuts the inner wall of the installation slot and the bottom surface of the positioning notch. Thus, when one end of the positioning block abuts the inner wall of the installation slot, it indicates that it is properly engaged with the positioning notch, making it easier to observe and determine whether the installation is complete.

[0020] Compared with the prior art, the advantages of the present invention are as follows:

[0021] When installing the exhaust insert of the exhaust structure of this injection mold, the upper end of the pull rod can be connected to the exhaust insert first, and then the exhaust insert can be pre-inserted into the receiving groove from top to bottom. The pull rod is inserted into the vent. Since it is difficult to directly insert it into place, the lower part of the guide slope on the pull rod will be opposite to the positioning block. Then the fastener is tightened so that one end of the positioning block is against the guide slope and gradually fed toward the pull rod, and then the pull rod is driven to move downward through the guide slope and the exhaust insert is pulled down into place. During the whole process, the molding surface of the exhaust insert will not be directly subjected to force, and the pull rod only applies a simple downward force to the exhaust insert, thereby avoiding the thin plate-shaped exhaust insert from being bent by torque and ensuring the installation quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the three-dimensional structure of this embodiment.

[0023] Figure 2 2 is a schematic diagram of the top structure of this embodiment.

[0024] Figure 3 yes Figure 2 Schematic diagram of the AA cross-section structure in.

[0025] Figure 4 yes Figure 3 Enlarged view of part B in .

[0026] Figure 5 yes Figure 3 Enlarged view of part C in .

[0027] Figure 6 It is a schematic diagram of the three-dimensional structure from another angle of this embodiment.

[0028] Figure 7 yes Figure 6 Enlarged view of part D in .

[0029] Figure 8 It is a schematic diagram of the explosion of the local structure in this embodiment.

[0030] In the figure, 1, insert; 11, receiving groove; 12, mounting groove; 13, vent hole;

[0031] 2. Exhaust insert; 21. Limiting groove;

[0032] 3. Pull rod; 31. Positioning notch; 311. Guide slope;

[0033] 4. Compression block; 41. Force application slope;

[0034] 5. Positioning block; 51. Force-bearing inclined surface;

[0035] 6. Fasteners; 7. Locating pins. DETAILED DESCRIPTION

[0036] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0037] like Figure 1-8As shown, the injection mold includes an insert 1, and the exhaust structure includes three exhaust inserts 2 and a receiving groove 11 located at the top of the insert 1. The three exhaust inserts 2 are thin plate-shaped and are all embedded in the receiving groove 11. The bottom surface of the receiving groove 11 has a vertical through-vent 13. The exhaust structure also includes a pull rod 3 vertically inserted into the vent 13. The pull rod 3 is circumferentially limited with the inner wall of the vent 13. The upper end of the pull rod 3 is connected to the exhaust insert 2. The outer periphery of the lower end of the pull rod 3 has a flared positioning notch 31. The lower side surface of the inner wall of the positioning notch 31 has a guiding slope 311. The bottom surface of the insert 1 has an installation hole connected to the positioning notch 31. The mounting groove 12 is embedded with a clamping block 4 and a positioning block 5 that can slide back and forth along the inner wall of the mounting groove 12 toward the pull rod 3. The clamping block 4 is fixedly connected to the insert 1 by a vertically arranged fastener 6 and the positioning block 5 is pressed on the bottom surface of the mounting groove 12. The fastener 6 is a bolt. One end of the positioning block 5 is inserted into the positioning notch 31 and is limitedly matched with the pull rod 3 along the length direction of the pull rod 3. The other end of the positioning block 5 has a force-bearing inclined surface 51 arranged vertically downward. The angle between the force-bearing inclined surface 51 and the vertical direction is 10 degrees to ensure that the component force is sufficient. The outer periphery of the clamping block 4 has a force-applying inclined surface 41 that fits the force-bearing inclined surface 51. The exhaust insert 2 is inserted in the receiving groove 11 of the insert 1, which can be embedded in the mold and the surface of the exhaust insert 1 can participate in the molding of the injection molded part. Air and water vapor can be discharged through the gap between the exhaust inserts 2 and between the exhaust insert 2 and the insert 1 and the mold through the vent 13; by setting the exhaust structure also including a pull rod 3 inserted in the bottom surface of the receiving groove 11, the upper end of the pull rod 3 is connected to the exhaust insert 2, and a positioning notch 31 is provided on the outer periphery of the lower end of the pull rod 3. The air can be discharged downward along the gap between the pull rod 3 and the inner wall of the insert 1. One end of the horizontally arranged positioning block 5 is matched with the inner wall of the positioning notch 31 along the vertical limit, and at the same time, the other end of the positioning block 5 is abutted against the clamping block 4 fixed by bolts. The clamping block 4 limits the positioning block 5 to a fixed position on the bottom surface of the installation groove 12 through the force-bearing inclined surface 51, which can ensure that the installation position of the pull rod 3 is accurate and stable. At the same time, when installing the exhaust insert 2, you can first The upper end of the pull rod 3 is connected to multiple exhaust inserts 2, and then the exhaust insert 2 is pre-inserted into the accommodating groove 11 from top to bottom. Then the positioning block 5 can be installed in the installation groove 12, so that the end of the positioning block 5 is inserted into the partially exposed positioning notch 31, and then the clamping block 4 is installed and bolted to the bottom surface of the installation groove 12 and tightened. At this time, the force-applying inclined surface 41 on the clamping block 4 is opposite to the force-bearing inclined surface 51 on the positioning block 5, and one end of the positioning block 5 is against the guide inclined surface 311. As the bolt is tightened, the clamping block 4 pushes the positioning block 5 toward the pull rod 3, and then drives the pull rod 3 to move downward through the guide inclined surface 311 and pulls the exhaust insert 2 down into place. In this way, the entire fastening mechanism is hidden inside the insert 1 and will not cause interference. It has good compactness and avoids direct force on the surface of the exhaust insert 1 from above during installation, which may cause damage to the molding surface, thereby ensuring the installation quality of the exhaust insert 2 and the compactness of the mold structure.Specifically, the vertical sides of the exhaust insert 2 are parallel to the pull rod 3, and the pull rod 3 is in the shape of a flat straight rod. The thickness of the pull rod 3 is smaller than the width of the accommodating groove 11. In this way, the pull rod 3 can be assembled with the exhaust insert 2 before being inserted into the accommodating groove 11 together, which helps to reduce the difficulty of the installation operation. One end of the positioning block 5 is in the shape of a pointed tip that matches the shape of the positioning notch 31, that is, the bottom surface of one end of the positioning block 5 is in contact with the guide bevel 311, and the angle between the guide surface and the vertical direction is 80 degrees. In this way, during the process of inserting one end of the positioning block 5 into the positioning notch 31 along the guide bevel 311, the bottom surface of the positioning block 5 can maintain a contact state with the guide bevel 311, thereby increasing the force-bearing area, reducing wear and scratching, and ensuring smooth and accurate installation of the exhaust insert 1. The clamping block 4 is positioned and fitted in the mounting groove 12 along the circumferential direction, and the clamping block 4 is also against the bottom surface of the mounting groove 12. This allows the compression block 4 to maintain a stable angle after being installed in the installation slot 12, thereby ensuring a stable interaction between the force-applying inclined surface 41 and the force-receiving inclined surface 51, thereby pushing the positioning block 5 toward the side where the pull rod 3 is located, ensuring a successful installation. One end of the positioning block 5 simultaneously abuts the inner wall of the installation slot 12 and the bottom surface of the positioning notch 31. When one end of the positioning block 5 abuts the inner wall of the installation slot 12, it indicates that it is properly engaged with the positioning notch 31, making it easier to observe and determine whether the installation is complete.

[0038] like Figure 2-8 As shown, there are two pull rods 3 spaced apart along the direction in which the exhaust panel 2 is installed. This allows the thin plate-like exhaust panel 2 to be installed in place by pulling it separately at two different positions, resulting in a more even load and reducing the probability of deformation of the exhaust panel 2 during the insertion process. The positioning notches 31 on the two adjacent pull rods 3 face opposite directions in the transverse direction. This allows the adjacent pull rods 3 to receive opposite transverse forces from the positioning blocks 5, preventing the exhaust panel 1 from being displaced toward the same end by the uniform transverse force of the pull rods 3 during insertion, thereby ensuring effective installation. A limiting groove 21 is provided on the bottom side of the exhaust panel 2. The limiting groove 21 is T-shaped, and the upper end of the pull rod 3 is embedded in the limiting groove 21 and cooperates with the exhaust panel 2 in a vertically limited manner. This allows the upper end of the pull rod 3 to be embedded in the limiting groove 21 in the transverse direction for convenient connection, while also ensuring a more even force on the inner wall of the limiting groove 21. Preferably, a locating pin 7 is provided on the side of the exhaust panel 2. The locating pin 7 is offset from the position of the retaining groove 21 along the direction in which the exhaust panel 2 is installed, and the end face of the locating pin 7 is coplanar with the surface of the exhaust panel 2. This locating pin 7 constrains the multiple exhaust panels 2 and, in conjunction with the tie rod 3, enhances their overall strength, preventing vertical misalignment during insertion. The edges of the receiving groove 11 are excessively chamfered. This reduces the likelihood of scratches on the exhaust panel 2 due to the significant force between it and the edge of the receiving groove 11 when it is tightened into place.

[0039] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope of the appended claims.

Claims

1. An exhaust structure of an injection mold, the injection mold comprising an insert (1), the exhaust structure comprising an exhaust insert (2) and a receiving groove (11) located on the top of the insert (1), the exhaust insert (2) being embedded in the receiving groove (11) and abutting against the bottom surface of the receiving groove (11), the bottom surface of the receiving groove (11) having a vertically penetrating vent (13), characterized in that: A pull rod (3) whose upper end is connected to the exhaust insert (2) is inserted into the vent hole (13), and the outer periphery of the pull rod (3) has a guide slope (311) arranged vertically upward. The insert (1) is also provided with a fastener (6) and a positioning block (5) that can slide horizontally toward the pull rod (3) during the tightening process of the fastener (6), and the positioning block (5) and the guide slope (311) are vertically limited and abutted; the bottom surface of the insert (1) has a mounting groove (12) connected to the vent hole (13), and a pressing block (4) and the positioning block (5) are embedded in the mounting groove (12). The pressing block (4) is connected to the insert (1) through a fastener (6) that passes through vertically and presses the positioning block (5) on the bottom surface of the mounting groove (12), and the positioning block (5) is away from the pull rod (3 ) has a force-bearing inclined surface (51) arranged vertically downward at one end, the outer periphery of the clamping block (4) has a force-applying inclined surface (41) that fits with the force-bearing inclined surface (51), the outer periphery of the lower end of the pull rod (3) has a positioning notch (31), the guide inclined surface (311) is located on the lower side of the inner wall of the positioning notch (31), the positioning block (5) is positioned and embedded in the positioning notch (31), the bottom surface of one end of the positioning block (5) located in the positioning notch (31) fits with the guide inclined surface (311), the end surface of one end of the positioning block (5) located in the positioning notch (31) abuts against the inner wall of the mounting groove (12), the clamping block (4) is positioned and fitted in the mounting groove (12) along the circumferential direction, and the clamping block (4) simultaneously abuts against the bottom surface of the mounting groove (12).

2. The exhaust structure of the injection mold according to claim 1, characterized in that: There are a plurality of pull rods (3) which are arranged at intervals along the setting direction of the exhaust insert (2).

3. The exhaust structure of the injection mold according to claim 2, characterized in that: The positioning notches (31) on the two adjacent pull rods (3) are oriented in opposite directions in the transverse direction.

4. The exhaust structure of the injection mold according to claim 1, 2 or 3, characterized in that: There are a plurality of exhaust inserts (2), and a limiting groove (21) is provided on the bottom side of each of the exhaust inserts (2). The limiting groove (21) is T-shaped, and the upper end of the pull rod (3) is embedded in the limiting groove (21) and cooperates with the exhaust insert (2) in a vertical limiting manner.

5. The exhaust structure of the injection mold according to claim 4, characterized in that: A positioning pin (7) is provided on the side of the exhaust insert (2), and the positioning pin (7) is arranged in a staggered manner with respect to the position of the limiting groove (21) along the setting direction of the exhaust insert (2), and the end face of the positioning pin (7) is coplanar with the surface of the exhaust insert (2).

6. The exhaust structure of the injection mold according to claim 1, 2 or 3, characterized in that: The edges of the accommodating groove (11) are chamfered; the vertical sides of the exhaust insert (2) are parallel to the pull rod (3); the pull rod (3) is in the shape of a flat straight rod, and the thickness of the pull rod (3) is smaller than the width of the accommodating groove (11).

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