An ejector guide and limiting device for an injection molding machine

Abstract

This utility model relates to the field of injection molding machine technology and discloses an ejector guide and limiting device for an injection molding machine, comprising: a main body assembly including a machine body, a first mold being disposed on the upper part of the machine body, a second mold being disposed on one side of the first mold, and an ejector rod penetrating through the interior of the first mold; a guide assembly, the guide assembly being disposed in the first mold and capable of maintaining the horizontal displacement of the ejector rod, the guide assembly including a housing disposed in the first mold; when the machine body performs injection molding on the product and uses the ejector rod to eject and demold the product, firstly, the telescopic housing can extend horizontally with the ejector rod, and in conjunction with the groove with a matching diameter, it can provide absolute horizontal guidance for the ejector rod, reduce the friction between the ejector rod and the inner wall of the ejector pin hole, and at the same time, it can also avoid the phenomenon of uneven force on the end of the ejector rod and deviation of the ejection trajectory due to irregular parts of the product surface.

Description

Technical Field

[0001] This utility model relates to the field of injection molding machine technology, and in particular to an ejector guide and limiting device for injection molding machines. Background Technology

[0002] Injection molding machines, also known as injection molding machines or injection machines, are the main molding equipment used to make various shapes of plastic products from thermoplastic or thermosetting plastics using plastic molds. In the injection mold of an injection molding machine, ejector pins are generally provided to eject the molded product and demold it.

[0003] In the ejection system of traditional injection molds, the guide structure of the ejector pin usually relies on the ejector pin hole to constrain its movement trajectory. However, the wear resistance of the mold plate material is limited. After the ejector pin is subjected to high-frequency friction in the ejector pin hole for a long time, the ejector pin hole will gradually enlarge. Therefore, there will be problems such as the ejector pin shifting due to uneven force when it contacts the product surface, and high-pressure molten plastic seeping into the ejector pin hole. Utility Model Content

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the present invention.

[0005] In view of the problems existing in the above and / or existing injection molding machine ejection guide limit devices, this utility model is proposed.

[0006] Therefore, the problem that this utility model aims to solve is that the guide structure of the traditional push rod is prone to wear and tear due to long-term contact, which affects the guiding effect of the push rod and easily leads to the seepage of injection molding material.

[0007] To solve the above technical problems, this utility model provides the following technical solution: an ejector guide and limiting device for an injection molding machine, comprising a main body component including a machine body, a first mold being provided on the upper part of the machine body, a second mold being provided on one side of the first mold, and an ejector rod penetrating through the interior of the first mold;

[0008] A guide assembly disposed in a first mold and capable of maintaining the ejector pin in a horizontal displacement, the guide assembly including a housing disposed in the first mold.

[0009] As a preferred embodiment of the injection molding machine ejection guide limiting device of the present invention, the guide component further includes a groove in the first mold, the groove having a stepped design, the housing being located in the groove, and an ejector pin hole being provided inside the first mold, the ejector pin hole being connected to the groove.

[0010] As a preferred embodiment of the injection molding machine ejection guide and limiting device of this utility model, the housing is composed of three mutually nested movable shells, the three movable shells respectively correspond to the stepped segments of the tank, and the surface of the movable shell with the larger diameter in the housing is fixedly connected to the inner wall of the tank.

[0011] In a preferred embodiment of the injection molding machine ejection guide limiting device of this utility model, a fixed sleeve is connected to the inner wall of another movable shell with a smaller diameter, and the inner wall of the fixed sleeve is fixedly connected to the surface of the ejector rod.

[0012] As a preferred embodiment of the injection molding machine ejection guide limiting device of this utility model, a one-way valve is connected to the surface of the housing with a larger diameter, and the air inlet end of the one-way valve extends to the outside of the first mold.

[0013] As a preferred embodiment of the injection molding machine ejection guide and limiting device of this utility model, a sliding sleeve is fixedly connected to the inner wall of the movable shell with a larger diameter in the housing, and the inner wall of the sliding sleeve is slidably connected to the surface of the ejector rod.

[0014] As a preferred embodiment of the injection molding machine ejection guide limiting device of the present invention, the guide assembly further includes a sealing member disposed on one side of the housing, the sealing member including an air bladder connected to one side of the housing through an air pipe and sleeved on the surface of the ejector rod.

[0015] As a preferred embodiment of the injection molding machine ejection guide limiting device of this utility model, the air bladder is designed in an annular shape, and the inner wall of the air bladder is bonded to the surface of the ejector rod and close to one end of the plug.

[0016] As a preferred embodiment of the injection molding machine ejection guide and limiting device of the present invention, an air outlet is provided on the surface of the air bladder and on the side near the movable shell, and multiple air outlets are provided in a ring array with the ejector rod as the axis.

[0017] As a preferred embodiment of the injection molding machine ejection guide and limiting device of this utility model, the gas injection angle of the air outlet is designed to face inward.

[0018] The beneficial effects of this utility model are as follows: when the machine body performs injection molding on the product and uses the ejector pin to eject the product from the mold, the telescopic housing can first extend horizontally with the ejector pin, and with the matching groove, it can provide absolute horizontal guidance for the ejector pin, reduce the friction between the ejector pin and the inner wall of the ejector pin hole, and at the same time avoid the phenomenon of uneven force on the end of the ejector pin and deviation of the ejection trajectory due to the irregular parts of the product surface.

[0019] When the ejector rod retracts, the housing retracts along with it. At this time, the gas inside the housing is injected into the air bladder. The air outlet on the surface of the air bladder blows the gas outward from multiple directions. After the ejector rod is fully reset, the air bladder inflates and fits against the inner wall of the ejector pin hole to seal the inner wall of the ejector pin hole, which can prevent molten plastic from seeping into the ejector pin hole during the return stroke of the ejector rod. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

[0021] Figure 1 This is a structural diagram of the ejector guide and limit device for an injection molding machine.

[0022] Figure 2 This is a schematic diagram of the internal structure of the first mold for the ejection guide and limiting device of an injection molding machine.

[0023] Figure 3 This is a schematic diagram of the internal structure of the guide assembly of the ejector guide limit device for an injection molding machine.

[0024] Figure 4 This is a structural diagram of the guide assembly and sealing component of the ejection guide limit device for an injection molding machine.

[0025] 1. Machine body; 2. First mold; 3. Second mold; 4. Guide assembly; 41. Groove; 42. Housing; 43. Sliding sleeve; 44. One-way valve; 45. Fixing sleeve; 46. Air bladder; 47. Air outlet; 5. Push rod. Detailed Implementation

[0026] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0027] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0028] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments.

[0029] Example 1

[0030] Reference Figure 1 This is the first embodiment of the present invention, which provides an ejector guide limiting device for an injection molding machine. The ejector guide limiting device for an injection molding machine includes...

[0031] The main components include a machine body 1, a first mold 2 is provided on the upper part of the machine body 1, a second mold 3 is provided on one side of the first mold 2, and a push rod 5 passes through the interior of the first mold 2;

[0032] Reference Figure 2 The aforementioned machine body 1 comprises a base, an injection molding machine disposed on one side above the base, a second mold 3 disposed on the injection end of the injection molding machine, a first mold 2 that cooperates with the second mold 3, a push plate disposed on one side of the first mold 2, a push rod 5 with its end fixed to the surface of the push plate, a movable plate disposed on one side of the push plate, and a push rod disposed on the surface of the movable plate. In actual use, the operator first feeds the plastic raw material into the heating zone through the screw or piston system of the injection molding machine, where it is heated to a molten state to form a melt. When the melt reaches a suitable temperature, it is injected into the mold cavity by pushing the screw or piston. After the mold is filled, the ejector rod in the injection molding machine will drive the ejector plate through the movable plate to apply pressure from the first mold 2 to the second mold 3, ensuring that the plastic in the mold is not backflowed and compacting the product to prevent deformation. After cooling, the ejector rod will drive the movable plate to reset. At this time, the movable plate will drive the ejector plate to return. An abutment rod is provided on the side of the ejector plate near the ejector rod, and an abutment seat corresponding to the abutment rod is also provided between the two ejector rods. When the ejector plate returns, the abutment rod on its surface will abut against the abutment seat, and the ejector rod will be abutted against in the opposite direction by the abutment rod. At this time, the ejector rod 5 on the surface of the ejector plate will be ejected outward from the first mold 2, so that the molded product can be ejected and demolded.

[0033] Guide assembly 4 is disposed in the first mold 2 and can keep the ejector rod 5 in a horizontal displacement. Guide assembly 4 includes a housing 42 disposed in the first mold 2.

[0034] When the push rod 5 moves, it will pull the movable shell with the smallest diameter to move. At this time, the shell 42 will be stretched. Since the end face of the shell 42 near the groove 41 is chamfered, when the push rod 5 moves, the stepped groove 41 will match the corresponding shell 42 segment, which can keep the push rod 5 absolutely horizontal and also disperse the pressure generated after the end of the push rod 5 contacts the product.

[0035] Specifically, the guide component 4 also includes a groove 41 formed in the first mold 2. The groove 41 has a stepped design, and the shell 42 is located in the groove 41. The first mold 2 has an ejector pin hole inside, and the ejector pin hole is connected to the groove 41.

[0036] Specifically, the shell 42 consists of three interlocking movable shells, each corresponding to a stepped segment of the tank 41. The surface of the movable shell with the larger diameter in the shell 42 is fixedly connected to the inner wall of the tank 41.

[0037] Specifically, another movable shell with a smaller diameter is connected to a fixed sleeve 45 on its inner wall, and the inner wall of the fixed sleeve 45 is fixedly connected to the surface of the top rod 5.

[0038] Specifically, a sliding sleeve 43 is fixedly connected to the inner wall of the movable shell with a larger diameter in the housing 42, and the inner wall of the sliding sleeve 43 is slidably connected to the surface of the push rod 5.

[0039] It should be noted that the push rod 5 is in a sliding state in the movable shell with the largest diameter, and the surface of the push rod 5 is in a close contact with the inner wall of the sliding sleeve 43. The sliding sleeve 43 can maintain an absolute seal with the push rod 5 when it slides, preventing gas leakage from the shell 42.

[0040] Example 2

[0041] Reference Figure 3 and Figure 4 This is the second embodiment of the present invention, which is based on the first two embodiments.

[0042] Specifically, the surface of the housing 42 with the larger diameter is connected to a one-way valve 44, and the air inlet of the one-way valve 44 extends to the outside of the first mold 2.

[0043] Specifically, the guide assembly 4 also includes a sealing element disposed on one side of the housing 42, the sealing element including an airbag 46 connected to one side of the housing 42 via an air tube and sleeved on the surface of the top rod 5.

[0044] Specifically, the airbag 46 has a ring-shaped design, and the inner wall of the airbag 46 is bonded to the surface of the push rod 5 and to one end near the plug.

[0045] The aforementioned housing 42 consists of three sealed movable housings. A one-way valve 44 is provided on the surface of the housing 42 with a larger diameter. When the push rod 5 extends outward and pushes the product out, it will pull the housing 42 to stretch. At this time, the housing 42 will draw external gas into the housing 42 through the one-way valve 44.

[0046] When the push rod 5 is reset, the housing 42 contracts. At this time, the gas inside the housing 42 will be injected into the air bag 46 through the air tube. As a result, the return air bag 46 will gradually expand, which can achieve the effect of sealing the push pin hole and preventing external molten plastic from seeping into the push pin hole.

[0047] It should be noted that the high temperature during the injection molding process is usually between 200°C and 350°C. The airbag 46 mentioned above is made of silicone rubber, which has good high temperature resistance and can be used in a temperature range of 250°C to 300°C. It also has good elasticity and aging resistance. Furthermore, the airbag 46 is located behind the ejector plug and is not in direct contact with the molten plastic. Therefore, the inclusion of the airbag 46 in this design will not affect the presentation of the effect.

[0048] Example 3

[0049] Reference Figure 3 and Figure 4 This is the third embodiment of the present invention, which is based on the first two embodiments.

[0050] Specifically, an air vent 47 is provided on the surface of the airbag 46 and on the side near the movable shell. Multiple air vents 47 are provided in a ring array with the push rod 5 as the axis.

[0051] Specifically, the gas injection angle of the vent 47 is designed to face inward.

[0052] An air outlet 47 is provided on the surface of the air bag 46. When the ejector rod 5 returns, gas enters the air bag 46. A portion of the gas will first be ejected outward through the air outlet 47, which can blow the molten plastic on the end face of the first mold 2 outward and prevent it from entering the ejector pin hole.

[0053] When the part of the airbag 46 with the air outlet 47 enters the ejector pin hole, the air outlet 47 will be blocked by the ejector pin hole. At this time, all the gas will enter the airbag 46, causing the airbag 46 to expand and fit against the inner wall of the ejector pin hole to form a blockage.

[0054] During use, when the machine body 1 injection molds the product and the ejector pin 5 ejects the product from the mold, the telescopic housing 42 first extends horizontally with the ejector pin 5. Combined with the matching groove 41, it provides absolute horizontal guidance for the ejector pin 5, reducing friction between the ejector pin 5 and the inner wall of the ejector pin hole. When the ejector pin 5 retracts, the housing 42 retracts along with it. At this time, the gas inside the housing 42 is injected into the airbag 46. The air outlet 47 on the surface of the airbag 46 blows the gas outward from multiple directions. After the ejector pin 5 is fully reset, the airbag 46 inflates and fits against the inner wall of the ejector pin hole to seal it. This prevents molten plastic from seeping into the ejector pin hole during the return stroke of the ejector pin 5, achieving both sealing and cleaning effects.

[0055] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. An ejector guide and limiting device for an injection molding machine, characterized in that: include, The main component includes a machine body (1), a first mold (2) is provided on the upper part of the machine body (1), a second mold (3) is provided on one side of the first mold (2), and a push rod (5) passes through the interior of the first mold (2). The guide assembly (4) is disposed in the first mold (2) and enables the ejector pin (5) to maintain a horizontal displacement. The guide assembly (4) includes a housing (42) disposed in the first mold (2).

2. The injection molding machine ejection guide limiting device as described in claim 1, characterized in that: The guide component (4) also includes a groove (41) opened in the first mold (2). The groove (41) has a stepped design. The housing (42) is located in the groove (41). The first mold (2) has an ejector pin hole inside. The ejector pin hole is connected to the groove (41).

3. The injection molding machine ejection guide limiting device as described in claim 2, characterized in that: The housing (42) consists of three interlocking movable shells, each corresponding to a stepped segment of the tank (41). The surface of the movable shell with the larger diameter in the housing (42) is fixedly connected to the inner wall of the tank (41).

4. The injection molding machine ejection guide limiting device as described in claim 3, characterized in that: The inner wall of the movable shell with a smaller diameter in the housing (42) is connected to a fixed sleeve (45), and the inner wall of the fixed sleeve (45) is fixedly connected to the surface of the top rod (5).

5. The injection molding machine ejection guide limiting device as described in claim 4, characterized in that: The surface of the housing (42) with the larger diameter is connected to a one-way valve (44), and the air inlet of the one-way valve (44) extends to the outside of the first mold (2).

6. The injection molding machine ejection guide limiting device as described in claim 5, characterized in that: The inner wall of the movable shell with a larger diameter in the housing (42) is fixedly connected to a sliding sleeve (43), and the inner wall of the sliding sleeve (43) is slidably connected to the surface of the top rod (5).

7. The injection molding machine ejection guide limiting device as described in claim 6, characterized in that: The guide assembly (4) also includes a sealing element disposed on one side of the housing (42), the sealing element including an airbag (46) connected to one side of the housing (42) via an air tube and sleeved on the surface of the top rod (5).

8. The injection molding machine ejection guide limiting device as described in claim 7, characterized in that: The airbag (46) is designed in a ring shape, and the inner wall of the airbag (46) is bonded to the surface of the top rod (5) and close to one end of the plug.

9. The injection molding machine ejection guide limiting device as described in claim 8, characterized in that: The air bladder (46) has an air outlet (47) on its surface and near the movable shell. The air outlet (47) has multiple outlets arranged in a ring array with the top rod (5) as the axis.

10. The injection molding machine ejection guide limiting device as described in claim 9, characterized in that: The gas injection angle of the vent (47) is designed to face inward.

Images