Valve needle driving device and hot runner system

Abstract

The utility model relates to the technical field of injection molding, in particular to a valve needle driving device and a hot runner system. The valve needle driving device comprises an installation structure, a piston rod and an elastic piece, the piston rod is movably connected into the installation structure, and the piston rod is connected with the valve needle so as to push the valve needle to move in the axial direction of the valve needle. One end of the elastic piece abuts against the piston rod, and the other end of the elastic piece abuts against the installation structure. The elastic piece is arranged between the piston rod and the mounting structure, when the oil pressure is reduced, the elastic piece abuts against the piston rod, the resilience force of the elastic piece prevents the piston rod from moving leftwards, then the valve needle can still maintain the sealing state of the hot nozzle, sealing failure caused by oil pressure fluctuation is prevented, the problem of valve needle returning is solved, and the service life of the hot nozzle is prolonged. And the stability and the reliability of the hot runner system are also improved. According to the hot runner system, by applying the valve needle driving device, the problem of valve needle retreating is solved, and the stability and the reliability of the hot runner system are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molding, in particular to a valve needle driving device and a hot runner system. Background Art

[0002] Hot runners use heat to keep the plastic in the runners and gates molten. A hot runner system generally consists of a hot nozzle, manifold, temperature control box, and accessories. Depending on the type of hot nozzle, hot runner systems can be categorized as open hot runner systems or valve-type hot runner systems. Valve-type hot runner systems are widely used because they offer smooth gate marks, no drooling, and can be used with sequentially controlled product welding, saving material, creating aesthetically pleasing parts, and maintaining a tight, high-strength interior.

[0003] The valve needle movement of the needle valve hot runner system can be achieved through a valve needle drive device, which includes a piston rod. The piston rod drives the valve needle to move along its axial direction to achieve the opening and closing of the hot nozzle.

[0004] During use, the piston rod of the existing valve needle drive device is prone to retreat during continuous movement. That is, when the oil pressure decreases, the valve needle may not be able to maintain a sealed state due to the loss of sufficient oil pressure support, resulting in leakage, which seriously affects the surface quality of the product in the subsequent molding process and reduces the stability and control accuracy of the hot runner system.

[0005] Therefore, there is an urgent need for a valve needle driving device and a hot runner system to solve the above problems. Utility Model Content

[0006] The purpose of the utility model is to provide a valve needle drive device and a hot runner system, which solves the problem of valve needle retreat and improves the stability and reliability of the hot runner system.

[0007] To achieve the above objectives, the following technical solutions are provided:

[0008] Valve needle drive device, including:

[0009] Mounting structure;

[0010] a piston rod movably connected to the mounting structure, the piston rod being connected to the valve needle to push the valve needle to move along the axial direction of the valve needle;

[0011] An elastic member, one end of which abuts against the piston rod, and the other end of which abuts against the mounting structure.

[0012] As an optional solution, a guide hole is provided on the piston rod, and at least a portion of the elastic member is located in the guide hole.

[0013] As an optional solution, the mounting structure includes:

[0014] a cylinder body, wherein the cylinder body is provided with a first inlet and a second inlet;

[0015] The cylinder body and the cylinder head together form an installation cavity, the piston rod divides the installation cavity into a first cavity and a second cavity, the first inlet is connected to the first cavity, and the second inlet is connected to the second cavity.

[0016] As an optional solution, a limiting groove is provided on the cylinder body, and at least a portion of the elastic member is located in the limiting groove.

[0017] As an optional solution, a first sealing member is provided between the cylinder body and the cylinder head;

[0018] and / or, a second sealing member is provided between the piston rod and the cylinder head;

[0019] And / or, a third sealing member is provided between the piston rod and the cylinder body.

[0020] As an optional solution, the valve needle drive device further includes:

[0021] An inner snap ring is embedded in the cylinder body and abuts against the outer end surface of the cylinder cover.

[0022] As an optional solution, the valve needle drive device further includes:

[0023] A support plate is provided on a side of the inner retaining ring facing away from the cylinder head, and at least a portion of the support plate is connected to the mounting structure.

[0024] As an optional solution, the valve needle drive device further includes:

[0025] A wear-resistant ring is arranged between the mounting structure and the piston rod.

[0026] As an optional solution, a connecting groove is provided on one of the piston rod and the valve needle, and a connecting portion is provided on the other, and the connecting portion is plugged into and matched with the connecting groove to achieve axial limiting fixation.

[0027] A hot runner system includes the valve needle drive device mentioned above.

[0028] Compared with the prior art, the beneficial effects of the present invention are:

[0029] The valve needle drive device provided by the utility model arranges an elastic part between the piston rod and the mounting structure. When the oil pressure decreases, the elastic part presses the piston rod. The rebound force of the elastic part prevents the piston rod from moving to the left, so that the valve needle can still maintain the sealing state at the hot nozzle, preventing sealing failure caused by oil pressure fluctuations, solving the valve needle retreat problem, and improving the stability and reliability of the hot runner system.

[0030] The hot runner system provided by the utility model solves the problem of valve needle retreat by applying the valve needle driving device, thereby improving the stability and reliability of the hot runner system. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0032] Figure 1 A cross-sectional view of a valve needle drive device provided in an embodiment of the present utility model.

[0033] Reference numerals:

[0034] 100. Valve needle drive device;

[0035] 10. Mounting structure; 101. First cavity; 102. Second cavity; 11. Cylinder body; 111. First inlet; 112. Second inlet; 113. Limiting groove; 12. Cylinder cover;

[0036] 20. Piston rod; 21. Guide hole; 22. Connecting groove;

[0037] 30. Elastic parts;

[0038] 41. First sealing member; 42. Second sealing member; 43. Third sealing member;

[0039] 50. Internal snap ring;

[0040] 60. Support plate;

[0041] 70. Wear-resistant ring;

[0042] 80. Cooling mechanism;

[0043] 200. Valve needle; 210. Connecting part. DETAILED DESCRIPTION

[0044] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0045] In the description of this application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0046] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, if the term "plurality" appears, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0047] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connected," "fixed," etc., should be interpreted broadly. For example, these terms may refer to fixed connections, removable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; and internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0048] In this application, unless otherwise expressly specified or limited, if a first feature is described as being "above" or "below" a second feature, or similar descriptions, this may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is described as being "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is described as being "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0049] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only embodiment.

[0050] The valve needle movement of the needle valve hot runner system can be achieved through a valve needle drive device, which includes a piston rod. The piston rod drives the valve needle to move along its axial direction to achieve the opening and closing of the hot nozzle.

[0051] During use, the piston rod of the existing valve needle drive device is prone to retreat during continuous movement. That is, when the oil pressure decreases, the valve needle may not be able to maintain a sealed state due to the loss of sufficient oil pressure support, resulting in leakage, which seriously affects the surface quality of the product in the subsequent molding process and reduces the stability and control accuracy of the hot runner system.

[0052] In order to solve the above problems, Figure 1 As shown, a valve needle driving device 100 provided in this embodiment includes a mounting structure 10, a piston rod 20 and an elastic member 30. The piston rod 20 is movably connected in the mounting structure 10. The piston rod 20 is connected to the valve needle 200 to push the valve needle 200 to move along the axial direction of the valve needle 200; one end of the elastic member 30 abuts against the piston rod 20, and the other end abuts against the mounting structure 10.

[0053] By arranging an elastic member 30 between the piston rod 20 and the mounting structure 10, when the oil pressure decreases, the elastic member 30 presses against the piston rod 20. The rebound force of the elastic member 30 prevents the piston rod 20 from moving to the left, so that the valve needle 200 can still maintain the sealing state at the hot nozzle, preventing sealing failure caused by oil pressure fluctuations, solving the problem of valve needle 200 retreat, and improving the stability and reliability of the hot runner system.

[0054] Optionally, the elastic member 30 is a compression spring.

[0055] Optionally, a connecting groove 22 is provided on the piston rod 20, and a connecting portion 210 is provided on the valve needle 200. The connecting portion 210 is plugged into and engaged with the connecting groove 22 to achieve axial positional fixation, thereby achieving the connection between the piston rod 20 and the valve needle 200. In other embodiments, the connecting groove 22 may also be provided on the valve needle 200, and the connecting portion 210 may be provided on the piston rod 20.

[0056] In this embodiment, the connecting groove 22 is a T-shaped groove, and the connecting portion 210 is plugged into and matched with the T-shaped groove to achieve a stable connection between the valve needle 200 and the piston rod 20 .

[0057] Optionally, a guide hole 21 is provided on the piston rod 20, and at least a portion of the elastic member 30 is located in the guide hole 21. By setting at least a portion of the elastic member 30 in the guide hole 21, guidance is provided for the elastic member 30, thereby ensuring the stability of the elastic member 30 and further ensuring the accuracy of the elastic force provided by the elastic member 30.

[0058] Optionally, the mounting structure 10 includes a cylinder body 11 and a cylinder head 12, and a first inlet 111 and a second inlet 112 are provided on the cylinder body 11. The cylinder body 11 and the cylinder head 12 together form an installation cavity, and the piston rod 20 divides the installation cavity into a first cavity 101 and a second cavity 102. The first inlet 111 is connected to the first cavity 101, and the second inlet 112 is connected to the second cavity 102. When the valve needle 200 is needed to block the hot nozzle, the hydraulic oil enters the first cavity 101 from the first inlet 111 to increase the oil pressure in the first cavity 101. As the oil pressure increases, the piston rod 20 is acted upon by the pressure and moves steadily to the right, thereby driving the valve needle 200 to move to the right to block the hot nozzle; when the valve needle 200 is needed to open the hot nozzle, the hydraulic oil enters the second cavity 102 from the second inlet 112 to increase the oil pressure in the second cavity 102. As the oil pressure increases, the piston rod 20 is acted upon by the pressure and moves steadily to the left, thereby driving the valve needle 200 to move to the left to open the hot nozzle.

[0059] In this embodiment, hydraulic oil is used as a pressure source to push the piston rod 20 to move. In other embodiments, other pressure sources may be used to push the piston rod 20 to move, such as compressed air.

[0060] It should be explained that the "left" and "right" mentioned in this embodiment are not the "left" and "right" in the actual application of the valve needle drive device 100 in the spatial sense, which are only used for reference. Figure 1 The viewing orientation is only used to distinguish different features and cannot be used as a limitation to the technical solution of this application.

[0061] Optionally, a limiting groove 113 is provided on the cylinder body 11 , and at least a portion of the elastic member 30 is located in the limiting groove 113 . By providing the limiting groove 113 on the cylinder body 11 to limit the elastic member 30 , displacement of the elastic member 30 is avoided.

[0062] Optionally, a first seal 41 is provided between the cylinder body 11 and the cylinder head 12; and / or a second seal 42 is provided between the piston rod 20 and the cylinder head 12; and / or a third seal 43 is provided between the piston rod 20 and the cylinder body 11, so as to improve the sealing performance of the valve needle drive device 100.

[0063] Optionally, the second seal 42 and the third seal 43 may be Glyd rings, which are composites of PTFE (Polytetrafluoroethylene) and rubber elastomers and have properties such as low friction, wear resistance, and corrosion resistance, and are used to enhance the sealing effect and prevent hydraulic oil leakage.

[0064] Optionally, the valve needle drive device 100 also includes an inner retaining ring 50, which is embedded in the cylinder body 11 and abuts against the outer end surface of the cylinder head 12. The inner retaining ring 50 has the characteristics of simple structure, easy installation, and reliable fixation. The cylinder head 12, piston rod 20 and other components are fixed by the inner retaining ring 50 to ensure the structural stability and durability of the valve needle drive device 100, thereby improving its service life.

[0065] Optionally, the valve needle drive device 100 also includes a support plate 60, which is arranged on the side of the inner retaining ring 50 away from the cylinder head 12, and at least a portion of the support plate 60 is connected to the mounting structure 10 to provide additional rigidity and stability to the cylinder body 11 and the cylinder head 12, thereby effectively preventing the valve needle drive device 100 from being deformed or damaged due to uneven force during operation.

[0066] Optionally, the valve needle drive device 100 further includes a wear-resistant ring 70 , which is disposed between the cylinder head 12 and the piston rod 20 . The wear-resistant ring 70 is made of wear-resistant material and can effectively reduce the frictional resistance during piston movement, thereby extending the service life of the valve needle drive device 100 .

[0067] Optionally, the valve needle drive device 100 also includes a cooling mechanism 80, which is arranged on the outer side of the cylinder body 11. The cooling mechanism 80 is used to take away the heat generated by the valve needle drive device 100 during operation, prevent the heat of the external device from being transferred to the cylinder body 11, reduce the temperature inside the cylinder body 11 when the valve needle drive device 100 is running, avoid the valve needle drive device 100 from working under high temperature conditions for a long time, and improve the service life and stability of the valve needle drive device 100.

[0068] Optionally, the cooling mechanism 80 includes a water inlet, a water outlet, and a circulating water channel. The water inlet is connected to the inlet of the circulating water channel, and the water outlet is connected to the outlet of the circulating water channel. Cooling water enters the circulating water channel through the water inlet and is discharged through the water outlet. The continuously flowing cooling water removes heat from the cylinder body 11, preventing heat from external devices from being transferred into the cylinder body 11. The cooling mechanism 80 achieves cyclic cooling of the cylinder body 11, thereby reducing the temperature within the cylinder body 11.

[0069] This embodiment also provides a hot runner system comprising a valve needle 200, a mold, and the aforementioned valve needle drive device 100. The mold is provided with a hot nozzle, and the valve needle drive device 100 drives the valve needle 200 to move along its axial direction to open or close the hot nozzle. By utilizing the valve needle drive device 100, the hot runner system solves the problem of valve needle 200 retraction and improves the stability and reliability of the hot runner system.

[0070] Note that throughout this specification, references to terms such as "some embodiments" and "other embodiments" indicate that the specific features, structures, materials, or characteristics described in conjunction with those embodiments or examples are included in at least one embodiment or example of the present invention. Throughout this specification, the schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be incorporated in any suitable manner in any one or more embodiments or examples.

[0071] The above are merely preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will appreciate that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, and substitutions are readily apparent to those skilled in the art without departing from the scope of the present invention. Therefore, while the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments and may include other equivalent embodiments without departing from the spirit of the present invention. The scope of the present invention is determined by the appended claims.

Claims

1. The valve needle drive device is characterized in that: include: Mounting structure (10); A piston rod (20) is movably connected to the mounting structure (10), and the piston rod (20) is connected to the valve needle (200) to push the valve needle (200) to move along the axial direction of the valve needle (200); An elastic member (30), one end of the elastic member (30) abuts against the piston rod (20), and the other end abuts against the mounting structure (10).

2. The valve needle drive device according to claim 1, characterized in that: A guide hole (21) is provided on the piston rod (20), and at least a portion of the elastic member (30) is located in the guide hole (21).

3. The valve needle drive device according to claim 1, characterized in that: The mounting structure (10) comprises: A cylinder body (11), wherein the cylinder body (11) is provided with a first inlet (111) and a second inlet (112); The cylinder head (12) comprises a cylinder body (11) and a cylinder head (12), wherein the cylinder body (11) and the cylinder head (12) together form an installation cavity, the piston rod (20) divides the installation cavity into a first cavity (101) and a second cavity (102), the first inlet (111) is connected to the first cavity (101), and the second inlet (112) is connected to the second cavity (102).

4. The valve needle drive device according to claim 3, characterized in that: A limiting groove (113) is provided on the cylinder body (11), and at least a portion of the elastic member (30) is located in the limiting groove (113).

5. The valve needle drive device according to claim 3, characterized in that: A first sealing member (41) is provided between the cylinder body (11) and the cylinder cover (12); and / or, a second sealing member (42) is provided between the piston rod (20) and the cylinder cover (12); And / or, a third sealing member (43) is provided between the piston rod (20) and the cylinder body (11).

6. The valve needle drive device according to claim 3, characterized in that: The valve needle drive device further includes: An inner snap ring (50) is embedded in the cylinder body (11) and abuts against the outer end surface of the cylinder cover (12).

7. The valve needle drive device according to claim 6, characterized in that: The valve needle drive device further includes: A support plate (60) is provided on a side of the inner snap ring (50) facing away from the cylinder head (12), and at least a portion of the support plate (60) is connected to the mounting structure (10).

8. The valve needle drive device according to any one of claims 1 to 7, characterized in that: The valve needle drive device further includes: A wear-resistant ring (70) is provided between the mounting structure (10) and the piston rod (20).

9. The valve needle drive device according to any one of claims 1 to 7, characterized in that: One of the piston rod (20) and the valve needle (200) is provided with a connecting groove (22), and the other is provided with a connecting portion (210). The connecting portion (210) is plugged into and matched with the connecting groove (22) to achieve axial limiting fixation.

10. Hot runner system, characterized in that, The valve needle drive device comprises the valve needle drive device according to any one of claims 1 to 9.

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