Injection molding machine ejector rod coupling structure

Abstract

The invention discloses an injection molding machine ejector rod coupling structure, and relates to the technical field of injection molding machine ejector rods, the injection molding machine ejector rod coupling structure comprises a first connecting piece, a second connecting piece and a lantern ring nut, one end of the first connecting piece is connected with an ejection assembly of an injection molding machine, and one end of the second connecting piece is tightly attached to the other end of the first connecting piece; the other end of the second connecting piece is connected with a mold top plate; the lantern ring nuts are arranged on the two end faces, tightly attached to the first connecting piece, of the second connecting piece in a sleeving mode. The deviation tolerance of the center of the injection molding machine ejector rod and the center of the mold ejector plate can be increased, it can be ensured that the ejector rod is consistent with the force transmission direction, and the ejector rod is effectively prevented from being broken due to the incorrect stress direction; meanwhile, the ejector rod connector is independently designed, the size is reduced, wide compatibility of the ejector rod connector can be achieved, different connectors are allowed to be replaced under the condition that the whole ejector rod is not dismantled, and therefore the replacement time is greatly shortened, and the cost generated by replacing parts is reduced.

Description

Technical Field

[0001] This invention relates to the field of ejector rod technology for injection molding machines, and in particular to a coupling structure for ejector rods of injection molding machines. Background Technology

[0002] In current injection molding machine ejector mechanism designs, the ejector rod is typically directly connected to the ejector plate via a thread, and a threaded hole is machined at the end of the ejector rod. However, when there is a misalignment between the machine's ejection center and the mold's ejection center, the ejector rod may be tilted, causing the ejection force to be inconsistent with the direction of the ejector rod. In severe cases, this can lead to ejector rod breakage, especially when the mold's top plate uses a pull-back structure and the mold side also uses threaded connections, further exacerbating the misalignment and increasing the risk of ejector rod breakage.

[0003] Secondly, if a temporary mold replacement is required, and the interface of the new mold does not match that of the original mold, the ejector rod end has a fixed-size threaded hole, making adjustment impossible. This leads to interface incompatibility issues. The existing threaded connection method cannot meet the diverse needs of mold interfaces, affecting mold flexibility and replacement efficiency. Therefore, it is necessary to improve the existing ejector rod mechanism design to solve these problems and improve product reliability and applicability. Summary of the Invention

[0004] In view of this, the purpose of this invention is to provide an ejector rod coupling structure for injection molding machines to solve technical problems such as the deviation between the machine ejection center and the mold top plate center in the prior art.

[0005] To achieve the above objectives, the present invention provides an ejector rod coupling structure for an injection molding machine, comprising: The system comprises a first connector, a second connector, and a collar nut. One end of the first connector is connected to the ejector assembly of the injection molding machine. One end of the second connector is in close contact with the other end of the first connector. The other end of the second connector is used to connect to the ejector rod of the injection molding machine. The collar nut is fitted onto the two end faces of the second connector that are in close contact with the first connector.

[0006] Based on the above embodiments, the first connector is a first central connector block, one end of the first central connector block is connected to the ejection assembly of the injection molding machine, and the other end of the first central connector block is in close contact with the end face of one end of the second connector.

[0007] Based on the above embodiments, the first connector includes a first connecting screw and a first central connecting block. One end of the first connecting screw is connected to the ejection assembly of the injection molding machine, and the other end of the first connecting screw is connected to one end of the first central connecting block. The end face of the other end of the first central connecting block is in close contact with the second connector.

[0008] Based on the above embodiments, the second connector is a second central connector block, one end face of the second central connector block is in close contact with one end face of the first connector block, and the other end of the second central connector block is connected to the mold side ejection assembly.

[0009] Based on the above embodiments, the second connector includes a second connecting screw and a second central connecting block. One end face of the second central connecting block is in close contact with the first connector, and the other end of the second central connecting block is connected to one end of the second connecting screw. The other end of the second connecting screw is connected to the mold side ejection assembly.

[0010] Based on the above embodiments, the other end of the second connector is provided with a connection interface for connecting the mold top plate.

[0011] Based on the above embodiments, the connection interface of the second connector can be an external thread of the same size as the internal thread of the injection molding machine ejector rod.

[0012] Based on the above embodiments, the connection interface of the second connector can be an external thread that is one size smaller than the internal thread of the injection molding machine ejector rod.

[0013] Based on the above embodiments, the connection interface of the second connector can be an external thread that is two sizes smaller than the internal thread of the ejector rod of the injection molding machine.

[0014] Compared with existing technologies, this invention has beneficial effects. In this injection molding machine ejector rod coupling structure, the first connector primarily connects to the ejection assembly of the injection molding machine, responsible for transmitting the ejection force to the ejector rod system. One end of the second connector is tightly fitted to the first connector, and the collar nut tightens the contact surfaces of the two connectors. This not only increases the structural tightness and reliability but also compensates for possible deformation through preload, ensuring the accuracy and stability of the ejection action. The design of its connection interface gives the structure a certain degree of flexibility and adjustability, allowing for fine-tuning according to actual needs. It improves the tolerance for deviation between the machine's ejection center and the mold's top plate center, ensuring the ejector rod is aligned with the direction of force, thus better protecting the ejector rod from breakage. Furthermore, by designing the interface parts to be smaller, its compatibility and flexibility are enhanced, allowing replacement without disassembling the entire ejector rod, improving maintenance efficiency and reducing costs. Attached Figure Description

[0015] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of an embodiment of the present invention.

[0017] Figure 2 This is a cross-sectional view of an embodiment of the present invention.

[0018] Figure Labels The coupling structure 100 includes a first connector 10, a first connecting screw 11, a first central connecting block 12, a second connector 20, a second central connecting block 21, a second connecting screw 22, and a collar nut 30. Detailed Implementation

[0019] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0020] The components of the embodiments of the invention described and shown in the accompanying drawings can typically be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0021] Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this invention are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or end that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or ends.

[0023] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0024] like Figure 1 An ejector rod coupling structure 100 for an injection molding machine includes: a first connector 10, a second connector 20, and a collar nut 30. One end of the first connector 10 is connected to the ejector assembly of the injection molding machine. One end of the second connector 20 is tightly fitted against the end face of the other end of the first connector 10, and the other end of the second connector 20 is used to connect to the mold top plate. The collar nut 30 is sleeved on the two end faces of the second connector 20 that are tightly fitted against the first connector 10. The connection interface of the second connector 20 can be an external thread of the same size as the internal thread of the ejector rod of the injection molding machine; the connection interface of the second connector 20 can be an external thread one size smaller than the internal thread of the ejector rod of the injection molding machine; the connection interface of the second connector 20 can be an external thread two sizes smaller than the internal thread of the ejector rod of the injection molding machine.

[0025] Specifically, the end faces of the first connector 10 and the second connector 20 have external threads, which allows the collar nut 30 to be fitted onto and fix the two connectors.

[0026] In this injection molding machine ejector rod coupling structure, the first connector 10 connects to the ejector assembly of the injection molding machine, transmitting power. The second connector 20 is tightly attached to the first connector 10 and fixed by a collar nut 30, allowing for flexible connection with the injection molding machine ejector rod. The second connector 20 can adapt to the interfaces of ejector assemblies of different mold specifications, enhancing the versatility and maintainability of the structure. The collar nut 30 fixes the positions of the first connector 10 and the second connector 20, ensuring a stable connection. After the injection molding machine ejector assembly generates power, it is transmitted to the second connector 20 through the first connector 10. Different thread specifications of the second connector 20 can be selected as needed to match mold top plate interfaces with different internal thread sizes. By reducing the size of the ejector rod parts, the time for changing the ejector interface is greatly reduced, thus enabling rapid replacement of the ejector interface to adapt to different mold top plate interfaces, shortening the time when changing molds with different interfaces, and improving efficiency.

[0027] Specifically, this invention increases the tolerance for deviation between the machine ejector pin center and the mold ejector pin center, ensuring that the ejector pin is aligned with the force transmission direction and effectively preventing breakage due to incorrect force direction. Simultaneously, by independently designing and minimizing the size of the ejector pin interface, broad compatibility is achieved, allowing for the replacement of different interfaces without disassembling the entire ejector pin. This significantly shortens replacement time and reduces costs associated with replacing parts. The optimization of the entire system not only improves the safety of ejector pin use but also simplifies maintenance procedures, increases production efficiency, and enhances equipment reliability and durability.

[0028] Example 1, such as Figure 1 An ejector rod coupling structure 100 for an injection molding machine includes a first connecting member 10, which is a first central connecting block 12. One end of the first central connecting block 12 is connected to the ejector assembly of the injection molding machine, and the other end of the first central connecting block 12 is tightly attached to the end face of one end of a second connecting member 20. A collar nut 30 is sleeved on the two end faces of the second connecting member 20 that are tightly attached to the first central connecting block 12. The other end of the second connecting member 20 is connected to the mold top plate. The connection interface of the second connecting member 20 can be an external thread of the same size as the internal thread of the ejector rod of the injection molding machine; the connection interface of the second connecting member 20 can be an external thread one size smaller than the internal thread of the ejector rod of the injection molding machine; or the connection interface of the second connecting member 20 can be an external thread two sizes smaller than the internal thread of the ejector rod of the injection molding machine.

[0029] Example 2, as Figure 1 An ejector rod coupling structure 100 for an injection molding machine includes a first connecting member 10 comprising a first connecting screw 11 and a first central connecting block 12. One end of the first connecting screw 11 is connected to the ejector assembly of the injection molding machine, and the other end of the first connecting screw 11 is connected to one end of the first central connecting block 12. The end face of the other end of the first central connecting block 12 is in close contact with the end face of one end of a second connecting member 20. A collar nut 30 is fitted onto the two end faces of the second connecting member 20 that are in close contact with the first central connecting block 12. The other end of the second connecting member 20 is connected to the mold top plate. The connection interface of the second connecting member 20 can be an external thread of the same size as the internal thread of the ejector rod of the injection molding machine; the connection interface of the second connecting member 20 can be an external thread one size smaller than the internal thread of the ejector rod of the injection molding machine; or the connection interface of the second connecting member 20 can be an external thread two sizes smaller than the internal thread of the ejector rod of the injection molding machine.

[0030] Example 3, as Figure 1Based on embodiment 1 or 2, an injection molding machine ejector rod coupling structure 100 is provided. The second connecting member 20 is a second central connecting block 21. One end face of the second central connecting block 21 is tightly attached to one end face of the first connecting member 10. A collar nut 30 is sleeved on the two end faces of the second connecting member 20 that are tightly attached to the first central connecting block 12. The other end of the second connecting member 20 is connected to the mold top plate. The connection interface of the second connecting member 20 can be an external thread of the same size as the internal thread of the injection molding machine ejector rod; the connection interface of the second connecting member 20 can be an external thread one size smaller than the internal thread of the injection molding machine ejector rod; the connection interface of the second connecting member 20 can be an external thread two sizes smaller than the internal thread of the injection molding machine ejector rod.

[0031] Example 4, as Figure 1 Based on embodiment 1 or 2, an injection molding machine ejector rod coupling structure 100 is provided. The second connecting member 20 includes a second connecting screw 22 and a second central connecting block 21. One end face of the second central connecting block 21 is in close contact with the first connecting member 10. One end of the second connecting screw 22 is connected to the other end of the second central connecting block 21. A collar nut 30 is sleeved on the two end faces of the second central connecting block 21 that are in close contact with the first connecting member 10. The other end of the second connecting screw 22 is connected to the mold top plate. The connection interface of the second connecting screw 22 can be an external thread of the same size as the internal thread of the injection molding machine ejector rod; the connection interface of the second connecting screw 22 can be an external thread one size smaller than the internal thread of the injection molding machine ejector rod; the connection interface of the second connecting screw 22 can be an external thread two sizes smaller than the internal thread of the injection molding machine ejector rod.

[0032] Compared to existing methods that rely solely on threaded locking, this composite coupling structure significantly improves resistance to eccentric loads. The annular clamping force generated by the collar nut 30 ensures that the two connecting parts remain coaxial under eccentric loads, preventing the ejection force from becoming misaligned with the rod due to eccentric jacking force, and avoiding situations where the ejection rod might even break in severe cases. Surface contact force transmission also ensures that the ejection force and the rod are always coaxial, eliminating radial shear forces on the shaft and improving long-term service life. The technical solution of this invention significantly shortens the replacement time of the ejection system. Since the second connecting part 20 can be independently disassembled and assembled, there is no need to disassemble the entire ejection rod, thus improving maintenance efficiency.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An injection molding machine ejector rod coupling structure, characterized by, The utility model relates to a connecting device for injection molding machine, comprising: a first connecting piece, one end of which is connected with the ejection assembly of the injection molding machine, a second connecting piece, one end of which is in close contact with the other end of the first connecting piece, and the other end of which is used for connecting the mold top plate; a sleeve nut, which is sleeved on the two end faces of the second connecting piece in close contact with the first connecting piece.

2. The injection molding machine ejector rod coupling structure of claim 1, wherein, The first connecting piece is a first central connecting block, one end of which is connected with the ejection assembly of the injection molding machine, and the other end of which is in close contact with the end face of one end of the second connecting piece.

3. The injection molding machine ejector rod coupling structure of claim 1, wherein, The first connecting piece comprises a first connecting screw and a first central connecting block, one end of the first connecting screw is connected with the ejection assembly of the injection molding machine, the other end of the first connecting screw is connected with one end of the first central connecting block, and the end face of the other end of the first central connecting block is in close contact with the second connecting piece.

4. The injection molding machine ejector rod coupling structure of claim 1 wherein, The second connecting piece is a second central connecting block, the end face of one end of the second central connecting block is in close contact with the end face of one end of the first connecting piece, and the other end of the second central connecting block is connected with the ejection assembly on the side of the mold.

5. The injection molding machine ejector rod coupling structure of claim 1 wherein, The second connecting piece comprises a second connecting screw and a second central connecting block, the end face of one end of the second central connecting block is in close contact with the first connecting piece, the other end of the second central connecting block is connected with one end of the second connecting screw, and the other end of the second connecting screw is connected with the ejection assembly on the side of the mold.

6. The injection molding machine ejector rod coupling structure of claim 1, wherein, The other end of the second connecting piece is provided with a connecting interface for connecting the mold top plate.

7. The injection molding machine ejector rod coupling structure of claim 6, wherein, The connecting interface of the second connecting piece can be an external thread with the same size as the internal thread of the ejection rod of the injection molding machine.

8. The injection molding machine ejector rod coupling structure of claim 6, wherein, The connecting interface of the second connecting piece can be an external thread one size smaller than the internal thread of the ejection rod of the injection molding machine.

9. The injection molding machine ejector rod coupling structure of claim 6, wherein, The connecting interface of the second connecting piece can be an external thread two sizes smaller than the internal thread of the ejection rod of the injection molding machine.

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