Injection mold

Abstract

The utility model discloses an injection mold, which relates to the field of molds and comprises a fixed mold assembly, a movable mold assembly, an ejector plate assembly and a pull rod assembly, the fixed mold assembly comprises a bottom plate, square iron, a fixed mold plate and a guide column, the fixed mold assembly and the movable mold assembly are matched to form a cavity of a product, the ejector plate assembly is arranged in a space formed by the bottom plate of the fixed mold assembly, the square iron and the fixed mold plate, the pull rod assembly comprises a first pull rod and a second pull rod, one end of the first pull rod is fixed to the fixed mold assembly, and the other end of the first pull rod is provided with an inverted buckle. One end of the second pull rod is fixed on the ejector plate assembly, and the other end is provided with an inverted buckle matched with the inverted buckle of the first pull rod; in the demolding process, the fixed mold assembly drives the pull rod assembly to move in the moving process through matching of the pull rod inverted buckle, so that the ejector plate assembly is driven to move, a product is ejected out of a cavity, demolding of the product is achieved, no extra driving assembly needs to be added, the mold cost is reduced, and mold installation is simplified.

Description

Technical Field

[0001] The present application relates to the field of molds, and in particular to an injection mold. Background Art

[0002] Injection molds are the most commonly used molding molds in the production of thermoplastic plastic parts. The corresponding processing equipment for plastic injection molds is plastic injection molding machines. The plastic is first heated and melted in the heating barrel at the bottom of the injection molding machine. Then, pushed by the screw or plunger of the injection molding machine, it enters the mold cavity through the injection molding machine nozzle and the mold's pouring system. The plastic cools and hardens into shape, and the product is demolded to obtain the finished product.

[0003] The KO hole, also known as the ejector roller hole, is a structure installed on the rear mold panel of the mold. Its main function is to allow the ejector roller to directly hit the ejector plate when ejecting the product, thereby achieving smooth product ejection. However, during the mold ejection process, interference between the KO hole and the ejector sleeve or when using the backfill mold method for injection molding prevents normal ejection through the KO hole. Current technology often uses a drive component such as a cylinder to eject the mold. This method requires additional drive components and a power source for the drive components, increasing mold cost and making installation cumbersome. Utility Model Content

[0004] The technical problem to be solved by the present invention is to provide an injection mold, which solves the problems existing in the above-mentioned background technology.

[0005] The present application provides an injection mold that adopts the following technical solution:

[0006] An injection mold includes: a fixed mold assembly including a bottom plate, a square iron, a fixed mold plate and a guide column, the fixed mold plate is provided with a through hole and a countersunk hole, the guide column is passed through the fixed mold assembly, and a movable mold assembly, wherein the fixed mold assembly and the movable mold assembly cooperate to form a cavity of the product, and further includes:

[0007] An ejector plate assembly includes a first ejector plate, a second ejector plate, a mold ejector, and a return spring. The mold ejector is provided through the first ejector plate and the movable mold assembly. One end of the return spring is fixed to the first ejector plate, and the other end abuts against the countersunk hole of the fixed mold assembly. The first ejector plate and the second ejector plate are fixed by a connecting piece. The ejector plate assembly is disposed in a space formed by the bottom plate of the fixed mold assembly, the square iron, and the fixed mold plate, and can move along the axis of the mold ejector.

[0008] The pull rod assembly includes a first pull rod and a second pull rod. The first pull rod is fixed on the movable template, and the second pull rod is fixed on the second ejector plate. The mounting surfaces of the first pull rod and the second pull rod are parallel to each other. An undercut is provided at one end of the first pull rod away from the movable template, and an undercut matching the undercut of the first pull rod is provided at one end of the second pull rod away from the second ejector plate. A gap is provided between the two undercut surfaces.

[0009] By adopting the above technical solution, during the process of mold ejection, there is no need to rely on driving components such as oil cylinders. Through the inverted fit of the first pull rod detachably fixed to the movable template and the second pull rod fixed to the second ejector plate, the mold opening action is utilized to realize the first pull rod driving the second pull rod, thereby driving the ejector plate assembly to eject the product, reducing mold costs and simplifying mold installation.

[0010] Preferably, a hot nozzle is provided on the bottom plate and is passed through the fixed mold assembly. A cooling water channel for controlling the temperature is provided on the end surface of the bottom plate, and a positioning ring for installing the hot nozzle is also provided.

[0011] By adopting the above technical solution, the plastic used to generate the product in the injection mold remains in a molten state during the production process.

[0012] Preferably, a heat insulation plate is detachably fixed on the bottom plate, and a circular hole having the same size as the outer diameter of the positioning ring is provided on the heat insulation plate.

[0013] By adopting the above technical solution, the heat transfer between the injection molding machine and the mold is reduced, and the installation and positioning of the positioning ring is facilitated.

[0014] Preferably, the through holes on the movable plate and the first ejector plate for passing the mold ejectors are arranged in groups of two and are symmetrically distributed with the center line of the fixed plate as the axis of symmetry.

[0015] By adopting the above technical solution, the ejector pin of the mold is evenly stressed when ejecting the injection molded part, thus avoiding ejection deviation, ejection damage, etc.

[0016] Preferably, the end of the first pull rod fixed to the movable template is stepped, the movable template is provided with a groove matching the first pull rod boss, the first pull rod is embedded in the groove, the end of the second pull rod fixed to the second ejector plate is stepped, the second ejector plate is provided with a groove matching the second pull rod boss, and the second pull rod is embedded in the groove of the second ejector plate.

[0017] By adopting the above technical solution, the positioning of the first pull rod and the second pull rod is more accurate and the connection and fixation of the first pull rod and the movable template, the second pull rod and the second ejector plate are facilitated.

[0018] Preferably, the mounting surfaces of the first and second pull rods are parallel to the movement direction of the mold ejector, and the first and second pull rods are arranged in pairs on the same mounting surface.

[0019] By adopting the above technical solution, the ejector plate assembly is evenly stressed when moving with the second pull rod, thereby reducing the phenomenon of ejection deviation and damage during ejection of the injection molded part.

[0020] In summary, this application includes at least one of the following beneficial technical effects:

[0021] This application uses the cooperation of the pull rod inverted buckle to enable the fixed mold assembly to drive the movement of the pull rod assembly during the movement, thereby driving the movement of the ejector plate assembly, ejecting the product from the cavity, and realizing product demolding without the need for additional drive components, reducing mold costs and simplifying mold installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the front structure of the utility model;

[0023] Figure 2 This is a schematic cross-sectional view of the fixed mold assembly of the present invention;

[0024] Figure 3 It is a partial cross-sectional schematic diagram of the fixed mold assembly of the present utility model;

[0025] Figure 4 This is a schematic structural diagram of the movable mold assembly of the present utility model;

[0026] Figure 5 This is a schematic structural diagram of the ejector plate assembly of the present utility model;

[0027] Figure 6 This is a schematic structural diagram of the first pull rod and the second pull rod of the utility model;

[0028] Figure numerals: 1, fixed mold assembly; 2, movable mold assembly; 3, ejector plate assembly; 4, tie rod assembly; 11, bottom plate; 12, square iron; 13, fixed mold plate; 14, guide column; 111, hot nozzle; 112, positioning ring; 113, cooling water channel; 114, heat insulation plate; 21, movable mold plate; 22, panel; 31, first ejector plate; 32, second ejector plate; 33, mold ejector; 34, return spring; 41, first tie rod; 42, second tie rod. DETAILED DESCRIPTION

[0029] The following is combined with Figures 1-6 This application is described in further detail.

[0030] The embodiment of the present application discloses an injection mold.

[0031] like Figure 1 As shown, an injection mold includes a fixed mold assembly 1 and a movable mold assembly 2. The fixed mold assembly 1 and the movable mold assembly 2 cooperate to form a cavity of a product, and also includes an ejector plate assembly 3 and a pull rod assembly 4.

[0032] like Figure 2As shown, the fixed mold assembly 1 includes a base plate 11, a square iron 12, a fixed mold plate 13 and a guide column 14. The base plate 11 is provided with mounting holes symmetrically distributed with the center line of the base plate 11 as the symmetry axis, and a circular through hole is also provided at the center of symmetry. There are two square irons 12 and they are detachably mounted on the base plate 11. A space for the ejector plate assembly 3 to move is provided between the two square irons 12. A threaded hole is provided on the fixed mold plate 13 and it is detachably fixed to the end face of the square iron 12 away from the base plate 11. The end face of the fixed mold plate 13 close to the base plate 11 is also provided with a countersunk hole. The guide column 14 penetrates the base plate 11 and the ejector plate assembly 3 and is fixed to the fixed mold plate 13 by a threaded connection.

[0033] Combine Figure 2 and Figure 3 A hot nozzle 111 is installed at the symmetrical center of the bottom plate 11, which is arranged on the fixed mold assembly 1. A cooling water channel 113 is also provided on the end face of the bottom plate 11. The inlet of the cooling water channel 113 is arranged on the end face corresponding to the short side of the bottom plate 11, and the other end is connected with the mounting through hole of the hot nozzle 111. A heat insulation plate 114 equal in size to the end face of the bottom plate 11 is provided on the end face of the bottom plate 11 away from the fixed mold plate 13. A through hole is provided at the symmetrical center of the heat insulation plate 114 and is detachably fixed to the bottom plate 11. A positioning ring 112 is provided at the through hole of the heat insulation plate 114. Its outer diameter is equal to the through hole size of the heat insulation plate 114 and is pressed on the hot nozzle 111 to limit the movement of the hot nozzle 111 in a direction perpendicular to the end face of the bottom plate 11.

[0034] like Figure 4 As shown, the movable mold assembly 2 consists of a movable plate 21 and a panel 22. The movable plate 21 is provided with two square grooves on both end faces corresponding to the short sides. The grooves are provided with threaded holes and are symmetrically distributed with the center line of the end face as the symmetry axis.

[0035] like Figure 5 As shown, the ejector plate assembly 3 includes a first ejector plate 31, a second ejector plate 32, a mold ejector 33 and a return spring 34; the first ejector plate 31 is a rectangular plate, which is provided with a countersunk through-hole for passing the mold ejector 33, and a circular through-hole for passing the guide column 14; the end face of the second ejector plate 32 abuts against the end face of the first ejector plate 31 perpendicular to the mold ejector 33, and an open groove is provided on the end face corresponding to the short side of the second ejector plate 32, and a threaded hole is provided on the groove, and the center line of the end face is The mold ejectors 33 are symmetrically distributed along the axis of symmetry; there are twelve mold ejectors 33, one end of which penetrates the first ejector plate 31, and the other end abuts the end surface of the second ejector plate 32. The mold ejectors 33 are grouped in pairs and are symmetrically distributed with the end surface center line as the axis of symmetry; there are four return springs 34, which are respectively fixed at the four corners of the end surface of the first ejector plate 31 away from the second ejector plate 32, and the end surface is perpendicular to the ejector axis. One end of the return spring 34 is fixed on the first ejector plate 31, and the other end abuts the end surface of the countersunk hole on the fixed template 13.

[0036] Combine Figure 1and Figure 6 The pull rod assembly 4 consists of a first pull rod 41 and a second pull rod 42. One end of the first pull rod 41 is stepped, and the size of the step matches the size of the groove on the movable template 21. A through hole is provided on the step, and the number of through holes matches the number of threaded holes on the groove of the movable template 21. The other end of the first pull rod 41 is provided with an undercut, and the end face of the undercut away from the step is provided with a chamfer; the length of the second pull rod 42 is smaller than that of the first pull rod 41, and one end of the second pull rod 42 is also stepped, and the size of the step matches the size of the groove on the second ejector plate 32. A through hole is provided on the step, and the number of through holes matches the number of threaded holes on the groove of the second ejector plate 32. The other end of the second pull rod 42 is also provided with an undercut, and the end face of the undercut away from the step is provided with a chamfer, and a gap is provided between the two undercuts.

[0037] There are four tie rod assemblies 4 , with two sets of tie rod assemblies 4 provided on the side surface of the mold and the opposite end surface thereof, and the tie rod assemblies 4 are symmetrically arranged on the mounting surface thereof.

[0038] The implementation principle of an injection mold in an embodiment of the present application is as follows: in the mold closing state, the positioning is performed by the positioning ring 112, and the injection molding machine injects plastic into the cavity of the product formed by the fixed mold component 1 and the movable mold component 2. The temperature is controlled by the hot nozzle 111 and the cooling water channel 113 so that the plastic used to generate the product during the injection molding process remains in a molten state. After the injection molding is completed, the injection molding machine exits and waits for the product to cool and take shape before opening the mold.

[0039] In the mold opening state, the outer driving element lifts the movable mold assembly 2 in a direction perpendicular to the axis of the mold ejector 33. The first tie rod 41 detachably fixed to the movable plate 21 moves with the movement of the movable plate 21. The distance between the first tie rod 41 and the second tie rod 42 undercuts gradually decreases until the two tie rods are in contact and engaged. The movable mold assembly 2 continues to move, so that the first tie rod 41 pulls the second tie rod 42 to move. Since the second tie rod 42 is detachably fixed to the second ejector plate 32, the ejector plate assembly 3 moves along the axis of the guide column 14 with the movement of the second tie rod 42. The mold ejector 33 fixed on the first ejector plate 31 moves to eject the product from the cavity of the fixed mold plate 13. The return spring 34 fixed on the end face of the first ejector plate 31 is compressed to accumulate elastic potential energy. The outer driving element stops driving, and the elastic potential energy of the return spring 34 is released. The spring stretches, causing the first ejector plate 31, the second ejector plate 32 and the mold ejector 33 to move away from the fixed mold plate 13, thereby realizing the reset of the ejector plate assembly 3. There is no need to install a drive assembly on the side of the mold or provide a power source for the drive assembly, thereby reducing the mold cost and simplifying the installation of the mold.

[0040] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. An injection mold, comprising: A fixed mold assembly (1) includes a bottom plate (11), a square iron (12), a fixed mold plate (13) and a guide column (14), wherein the fixed mold plate (13) is provided with a through hole and a countersunk hole, and the guide column (14) is passed through the fixed mold assembly (1), and a movable mold assembly (2), wherein the fixed mold assembly (1) and the movable mold assembly (2) cooperate to form a cavity of a product, and is characterized in that it also includes: An ejector plate assembly (3) comprises a first ejector plate (31), a second ejector plate (32), a mold ejector pin (33) and a return spring (34); the mold ejector pin (33) is provided through the first ejector plate (31) and the movable mold assembly (2); one end of the return spring (34) is fixed to the first ejector plate (31), and the other end abuts against the countersunk hole of the fixed mold assembly (1); the first ejector plate (31) and the second ejector plate (32) are fixed by a connecting piece; the ejector plate assembly (3) is provided in a space formed by the bottom plate (11) of the fixed mold assembly (1), the square iron (12) and the fixed mold plate (13), and can move along the axis direction of the mold ejector pin (33); A pull rod assembly (4) includes a first pull rod (41) and a second pull rod (42), wherein the first pull rod (41) is fixed on a movable plate (21), and the second pull rod (42) is fixed on a second ejector plate (32), and the mounting surfaces of the first pull rod (41) and the second pull rod (42) are parallel to each other, and an undercut is provided at one end of the first pull rod (41) away from the movable plate (21), and an undercut matching the undercut of the first pull rod (41) is provided at one end of the second pull rod (42) away from the second ejector plate (32), and a gap is provided between the two undercut surfaces.

2. The injection mold according to claim 1, characterized in that: A hot nozzle (111) is provided on the bottom plate (11) and is passed through the fixed mold assembly (1). A cooling water channel (113) for controlling the temperature is provided on the end surface of the bottom plate (11), and a positioning ring (112) for installing the hot nozzle (111) is also provided.

3. The injection mold according to claim 2, characterized in that: A heat insulation plate (114) is detachably fixed on the bottom plate (11), and is provided with a circular hole having the same outer diameter as the positioning ring (112).

4. The injection mold according to claim 3, characterized in that: The through holes on the movable plate (21) and the first ejector plate (31) for passing the mold ejector pins (33) are symmetrically distributed in groups of two with the center line of the fixed plate (13) as the axis of symmetry.

5. The injection mold according to claim 4, characterized in that: One end of the first pull rod (41) fixed to the movable template (21) is in the shape of a step, and a groove matching the boss of the first pull rod (41) is provided on the movable template (21), and the first pull rod (41) is embedded in the groove, and one end of the second pull rod (42) fixed to the second ejector plate (32) is in the shape of a step, and a groove matching the boss of the second pull rod (42) is provided on the second ejector plate (32), and the second pull rod (42) is embedded in the groove of the second ejector plate (32).

6. The injection mold according to claim 5, characterized in that: The mounting surfaces of the first pull rod (41) and the second pull rod (42) are parallel to the movement direction of the mold ejector pin (33), and the first pull rod (41) and the second pull rod (42) are arranged in pairs on the same mounting surface.

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