Novel precise limiting monitoring device structure
By introducing a precise limit monitoring device into the injection mold, the valve needle displacement is monitored in real time and the valve needle opening and closing sequence is adjusted, which solves the problems of insufficient melt convergence and uneven injection pressure, and improves the quality and stability of injection molded products.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- INCOE INT TRADING SHANGHAI CO LTD
- Filing Date
- 2025-05-09
- Publication Date
- 2026-04-17
AI Technical Summary
Existing injection molds are prone to weld lines during injection due to insufficient molten material cohesion, and the injection pressure may be locally over-pressurized or under-filled, affecting product quality.
A novel precision limit monitoring device structure is adopted, including a monitoring device, a sliding rod, a single-sided guide push rod, a sensor, and a control system. It monitors the valve needle displacement in real time and dynamically adjusts the opening and closing sequence of the multi-gate valve needle to ensure optimized melt flow path and uniform injection pressure distribution.
By accurately monitoring the limit position, weld line problems can be reduced, local overpressure or insufficient filling can be avoided, the mechanical properties of the products can be improved, the scrap rate can be reduced, and the process stability can be enhanced.
Smart Images
Figure CN224130349U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of hot runner system technology, and in particular to a novel precise limit monitoring device structure. Background Technology
[0002] Injection molds are tools used to produce plastic products, giving them a complete structure and precise dimensions. Injection molding is a processing method used for the mass production of certain complex-shaped parts. Specifically, it involves injecting molten plastic into a mold cavity under high pressure using an injection molding machine, where it is then cooled and solidified to obtain the molded product.
[0003] During the injection molding process, molten plastic flows through the main runner into the manifold of the manifold, then from the manifold into the nozzle, and finally into the mold cavity of the injection mold, ultimately yielding the desired injection molded product. The opening and closing of the nozzle outlet is mainly accomplished by the up-and-down movement of the valve needle driven by a cylinder. When the piston rod of the cylinder moves the valve needle upward to the set position, the nozzle outlet is fully open; when the piston rod of the cylinder moves the valve needle downward to the set position, the nozzle outlet is fully closed.
[0004] However, due to the high requirements and high quality of products during the injection molding process, the injection mold is prone to technical problems such as weld lines caused by insufficient fusion of molten material. In addition, the injection pressure in the injection mold cavity may cause local overpressure or insufficient filling.
[0005] Therefore, through beneficial exploration and research, the applicant has found a solution to the above problems, and the technical solution to be introduced below is the result of this research. Utility Model Content
[0006] The technical problem to be solved by this utility model is to provide a novel precise limit monitoring device structure to address the aforementioned shortcomings and defects of the existing technology.
[0007] The technical problem to be solved by this utility model can be achieved by the following technical solution:
[0008] A novel precision limit monitoring device structure includes a cylinder body, a valve needle mounted on the cylinder body, and a cylinder piston rod mounted on the cylinder body for driving the valve needle to move up and down. The device is characterized by further including a monitoring device mounted on the cylinder body for detecting the valve needle displacement data. The monitoring device includes a sliding rod mounted on the cylinder body and cooperating with the cylinder piston rod, a single-sided guide push rod mounted on the cylinder body and cooperating with the sliding rod, and a sensor mounted on the cylinder body and cooperating with the single-sided guide push rod. The monitoring device also includes a connector mounted on the cylinder body, cooperating with the sensor, and connected to a control system.
[0009] In a preferred embodiment of this utility model, one end of the sliding rod is connected to the cylinder piston rod by a locking screw.
[0010] In a preferred embodiment of this utility model, the other end of the sliding rod is connected to the single-sided guide push rod via a threaded sleeve.
[0011] In a preferred embodiment of this invention, the single-sided guide push rod is embedded in the groove of the sensor.
[0012] In a preferred embodiment of this utility model, the monitoring device is fixed to the cylinder body by a fixing block.
[0013] Due to the adoption of the above technical solution, the beneficial effects of this utility model are as follows: In the hot runner system, the addition of a monitoring device can accurately monitor the valve needle position. Combined with the controller, the opening and closing sequence of the multi-gate valve needles can be dynamically adjusted to ensure the optimization of the melt flow path, reduce the weld line problem caused by insufficient melt convergence, and at the same time, the valve needle displacement data is fed back in real time. The controller can intelligently adjust the opening sequence and duration of each gate, so that the injection pressure is evenly distributed in the mold cavity, avoiding local overpressure or insufficient filling, improving the mechanical properties of the product, and the closed-loop control of the stroke can effectively compensate for the positioning deviation caused by mechanical wear or temperature drift, ensuring the consistency of valve needle action in each injection cycle, reducing the scrap rate, and improving process stability. Attached Figure Description
[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art 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.
[0015] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation
[0016] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the following description, in conjunction with specific illustrations, further elaborates on this utility model.
[0017] See Figure 1 The structure of a novel precision limit monitoring device shown includes a cylinder body 10, a valve needle 20 disposed on the cylinder body 10, and a cylinder piston rod 30 disposed on the cylinder body 10 for driving the valve needle 20 to move up and down.
[0018] It also includes a monitoring device 40 disposed on the cylinder body 10 for detecting the displacement data of the valve needle 20. In this embodiment, the monitoring device 40 is fixed to the cylinder body 10 by a fixing block 40a.
[0019] The monitoring device 40 includes a sliding rod 41 disposed on the cylinder body 10 and cooperating with the cylinder piston rod 30, a single-sided guide push rod 42 disposed on the cylinder body 10 and cooperating with the sliding rod 41, and a sensor 43 disposed on the cylinder body 10 and cooperating with the single-sided guide push rod 42.
[0020] The monitoring device 40 also includes a connector 44 disposed on the cylinder 10, which cooperates with the sensor 43 and is connected to the control system. In this embodiment, the control system is a controller.
[0021] One end of the sliding rod 41 is connected to the cylinder piston rod 30 via a locking bolt 41a, while the other end of the sliding rod 41 is connected to a one-sided guide push rod 42 via a threaded sleeve 41b. In this embodiment, the one-sided guide push rod 42 is embedded in the groove of the sensor 43. In use, when the cylinder piston rod 30 moves, it drives the sliding rod 41 to move, and the movement of the sliding rod 41 in turn drives the one-sided guide push rod 42 to move.
[0022] In use, during the injection molding process, the valve needle 20 moves up and down, driven by the cylinder piston rod 30. This displacement of the cylinder piston rod 30 then moves the sliding rod 41, which in turn moves the single-sided guide push rod 42. At this time, the sensor 43 captures the linear displacement of the single-sided guide push rod 42. The sensor 43, based on compressed conductive plastic technology, achieves high-resolution displacement detection with a linearity error of ±0.1%. Finally, it outputs an analog voltage signal through a connector to the controller. The controller detects the voltage signal to detect the valve needle 20. The displacement data allows for precise monitoring of the valve needle position. Combined with the controller's dynamic adjustment of the opening and closing sequence of the multi-gate valve needles, this ensures optimized melt flow paths, reduces weld lines caused by insufficient melt convergence, and provides real-time feedback of valve needle displacement data. The controller can intelligently adjust the opening sequence and duration of each gate, ensuring uniform distribution of injection pressure within the mold cavity. This avoids localized overpressure or insufficient filling, improves the mechanical properties of the product, and the closed-loop control of the stroke effectively compensates for positioning deviations caused by mechanical wear or temperature drift. This ensures consistent valve needle movement in each injection cycle, reduces scrap rates, and improves process stability.
[0023] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.
Claims
1. A novel precision limit monitoring device structure, comprising a cylinder body, a valve needle disposed on the cylinder body, and a cylinder piston rod disposed on the cylinder body for driving the valve needle to move up and down, characterized in that, It also includes a monitoring device disposed on the cylinder body for detecting the valve needle displacement data. The monitoring device includes a sliding rod disposed on the cylinder body and cooperating with the cylinder piston rod, a single-sided guide push rod disposed on the cylinder body and cooperating with the sliding rod, and a sensor disposed on the cylinder body and cooperating with the single-sided guide push rod. The monitoring device also includes a connector disposed on the cylinder body, cooperating with the sensor, and connected to the control system.
2. The novel precision limit monitoring device structure according to claim 1, characterized in that, One end of the sliding rod is connected to the piston rod of the cylinder via a locking screw.
3. The novel precision limit monitoring device structure according to claim 1, characterized in that, The other end of the sliding rod is connected to the single-sided guide push rod via a threaded sleeve.
4. The novel precision limit monitoring device structure according to claim 1, characterized in that, The single-sided guide push rod is embedded in the groove of the sensor.
5. The novel precision limit monitoring device structure according to claim 1, characterized in that, The monitoring device is fixed to the cylinder body by a fixing block.