Anti-deflection injection mold with floating needle positioning mechanism

Abstract

An anti-deflection injection mold with a floating needle positioning mechanism comprises a front mold body and a rear mold body, a cavity is defined by the forming faces of the front mold body and the rear mold body, an insert is arranged in the cavity, and a positioning mechanism is arranged on the opposite side of the insert. The positioning mechanism comprises a guide sleeve fixed in the injection mold, a floating needle is slidably connected in the guide sleeve, the front end of the floating needle can penetrate through the guide sleeve to be connected with the insert in an abutting mode, a limiting step is arranged at the rear end of the floating needle, and a reset elastic piece is arranged between the front end of the limiting step and the guide sleeve. A driving assembly is arranged at the rear end of the floating needle and is subjected to sequential control through a PLC (Programmable Logic Controller) control system; a pressure sensor is arranged at the output end of the driving assembly. Through the synergistic effect of the floating needle, the driving assembly and the PLC control system, accurate positioning and automatic avoiding of the insert in the injection molding process are achieved. The stability and reliability of the injection molding process are ensured by adopting the symmetrically distributed positioning mechanisms, closed-loop control of the pressure sensor and sequential control of the PLC system.

Description

TECHNICAL FIELD

[0001] The utility model relates to injection mold technical field, especially in a kind of anti-oscillation injection mold with floating needle positioning mechanism. BACKGROUND

[0002] Mold insert refers to the part (such as threaded assembly, electronic connector, etc.) placed in advance in injection mold, and the technology of integrally forming the insert and plastic matrix by injection molding process. This technology is widely used to enhance the mechanical properties, strength and durability of plastic products, especially for parts that need to bear weight or have complex functions.

[0003] The positioning of the insert in the injection mold is a key factor affecting product quality. The existing technology mainly uses fixed positioning pins, which has the problems of inconvenient adjustment, easy wear and tear, and inability to dynamically respond to the injection stage, resulting in high failure rate of copper leakage and collision.

[0004] Therefore, in view of the deficiencies of the prior art, it is necessary to design a kind of anti-oscillation injection mold with floating needle positioning mechanism to solve the above problems.

[0005] It should be noted that the above introduction to the technical background is only to facilitate a clear and complete description of the technical scheme of the utility model, and to facilitate the understanding of those skilled in the art. The above content cannot be considered as known by those skilled in the art just because it is described in the background of the utility model. INVENTION CONTENTS

[0006] In order to overcome the deficiencies of the prior art, the utility model aims to disclose an anti-oscillation injection mold with floating needle positioning mechanism, which solves the problem that the existing insert positioning mechanism cannot be dynamically adjusted according to the change of injection stage.

[0007] The utility model discloses an anti-oscillation injection mold with floating needle positioning mechanism, which comprises a front mold and a rear mold, and the molding surfaces of the front mold and the rear mold form a molding cavity. An insert is arranged in the molding cavity, and the opposite side of the insert is provided with a positioning mechanism. The positioning mechanism comprises a guide sleeve fixed in the injection mold, a floating needle slidably connected in the guide sleeve, and a driving assembly provided at the rear end of the floating needle. The front end of the floating needle can pass through the guide sleeve and abut against the insert. A limit step is arranged at the rear end of the floating needle, and a reset elastic element is arranged between the front end of the limit step and the guide sleeve to reset the floating needle. The driving assembly is controlled by a PLC control system to control the timing, so that the positioning mechanism can accurately position the insert during the clamping stage, and automatically avoid the flow of melt during the injection stage, thereby improving the injection quality. A pressure sensor is arranged at the output end of the driving assembly to avoid overpressure or underpressure, improve the positioning stability, and realize closed-loop control of injection operation.

[0008] The preferred technical scheme is that the insert is provided with a positioning hole, and the front end of the floating needle is provided with a guide cone surface corresponding to the positioning hole.

[0009] The preferred technical scheme is that the guide cone surface of the floating needle is in interference fit with the positioning hole of the insert, so that the positioning accuracy is enhanced, and the micro displacement of the insert under high pressure is reduced.

[0010] The preferred technical scheme is that the opposite side positioning holes of the insert are symmetrically arranged, so that the force distribution is balanced, and the deflection caused by unilateral stress concentration is prevented.

[0011] The preferred technical scheme is that the taper ratio of the guide cone surface is 1:30 to 1:80, so that the insertion guide property and the contact area are balanced, and the jamming or loosening is avoided.

[0012] The preferred technical scheme is that the number of the positioning mechanisms is two or more, and the positioning mechanisms are symmetrically distributed on the outer periphery of the insert.

[0013] The preferred technical scheme is that the driving assembly is a hydraulic cylinder, which has small volume and stable output.

[0014] The preferred technical scheme is that the reset elastic member is a spring, which has low cost and is easy to replace, and meets the high-frequency injection molding demand.

[0015] Due to the use of the above technical scheme, the utility model has the beneficial effects compared with the prior art as follows:

[0016] (1) The driving assembly uses a pressure sensor to feedback to dynamically control the floating needle, so as to ensure the accuracy and stability of the insert positioning;

[0017] (2) In the injection stage, the floating needle is automatically retracted through the time sequence control of the PLC control system, so as to avoid interfering with the melt flow and improve the injection molding quality;

[0018] (3) The symmetrically distributed positioning mechanisms and the balanced force distribution effectively prevent the insert from deflection, and ensure the size consistency of the injection molded product. DRAWINGS

[0019] In order to more clearly illustrate the specific embodiments of the utility model or the technical scheme in the prior art, the drawings needed in the following specific embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the utility model, and other drawings can be obtained by those skilled in the art without creative labor.

[0020] Figure 1 It is a closing injection molding stage schematic view of the anti-deflection injection molding mold with the floating needle positioning mechanism.

[0021] Figure 2The utility model discloses a kind of anti-oscillation injection moulds with floating needle positioning mechanism mode switching stage schematic diagram.

[0022] Figure 3 The utility model discloses a kind of anti-oscillation injection moulds with floating needle positioning mechanism pressure maintaining stage schematic diagram.

[0023] In the above drawing, 100, melt;1, insert;2, positioning mechanism;21, guide sleeve;22, floating needle;22a, limit step;23, reset elastic member;24, driving assembly;25, pressure sensor. DETAILED DESCRIPTION

[0024] The following specific embodiments illustrate the embodiments of the utility model, and those skilled in the art can easily understand other advantages and effects of the utility model from the content disclosed in the specification.

[0025] It should be noted that the terms "first", "second" and the like in the description and claims of the application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily have to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so as to describe the embodiments of the application herein. In addition, the terms "include" and "have" and their synonyms are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0026] In the present application, the terms "up", "down", "left", "right", "front", "back", "top", "bottom", "inside", "outside", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the utility model and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0027] In addition, in addition to being used to indicate orientation or positional relationship, the above-mentioned part of the term can also be used to indicate other meanings, for example, the term "up" can also be used to indicate a certain dependent relationship or connection relationship in some cases. For those skilled in the art, the specific meaning of these terms in the utility model can be understood according to the specific circumstances.

[0028] In addition, the terms "mounting", "arrangement", "provided with", "connection", "connected", "sleeved", and "attached" should be interpreted broadly. For example, "connection" can be fixed connection, detachable connection, or integral structure; can be mechanical connection, or electrical connection; can be direct connection, or indirect connection through an intermediate medium; or internal communication between two devices, elements, or components. For example, "attached" can be complete attachment or partial attachment. Those skilled in the art can understand the specific meaning of the above terms in the present application according to the specific circumstances.

[0029] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0030] Embodiment:

[0031] As shown in Figure 1 , the present application discloses an anti-yaw injection mold with a floating needle positioning mechanism, comprising a front mold and a rear mold, the molding surfaces of the front mold and the rear mold form a molding cavity, an insert 1 is arranged in the molding cavity, and a positioning mechanism 2 is arranged on the opposite side of the insert 1. The main components of the present application will be described in detail below:

[0032] As shown in Figure 1 , Figure 2 , and Figure 3 , the insert 1 is provided with a positioning hole for connecting and positioning the floating needle 22; the positioning holes are symmetrically arranged on the opposite side of the insert 1, which facilitates the force balance of the opposite side of the insert 1.

[0033] As shown in Figure 1 , Figure 2 , and Figure 3As shown, the positioning mechanism 2 includes a guide sleeve 21 fixed in the injection mold, a float needle 22 made of SKD61 mold steel is slidingly connected in the guide sleeve 21, and the guide sleeve 21 ensures the stability of the movement direction of the float needle 22; the front end of the float needle 22 is provided with a guide conical surface corresponding to the positioning hole, the working section of the float needle 22 has a diameter of Φ3mm and a taper of 1:50, the guide conical surface of the front end of the float needle 22 can pass through the guide sleeve 21 and be in interference fit with the positioning hole of the insert 1, the balance of insertion and contact area is achieved, and the problems of jamming or loosening of the front end of the float needle 22 when connected with the positioning hole are avoided; the rear end of the float needle 22 is provided with a limiting step 22a, a spring is arranged between the front end of the limiting step 22a and the guide sleeve 21 as a reset elastic member 23, the float needle 22 is pushed away and reset by the reset elastic member 23; the rear end of the float needle 22 is provided with a hydraulic cylinder as a driving assembly 24, the driving assembly 24 is controlled in time sequence by a PLC control system, and the float needle 22 is dynamically controlled according to the injection stage; the output end of the driving assembly 24 is provided with a pressure sensor 25, and the injection operation parameters are adjusted in real time according to the pressure feedback.

[0034] Reference Figure 1 , Figure 2 and Figure 3 The use method and principle of the utility model are as follows:

[0035] In the mold clamping injection stage, after the PLC control system receives the mold clamping signal, the hydraulic cylinder is started, the driving assembly 24 drives the float needle 22 to move along the guide sleeve 21 to the insert 1, the guide conical surface at the front end of the float needle 22 is in interference fit with the positioning hole on the insert 1 as the mold clamping is performed, the accurate positioning of the insert 1 is realized, in this process, the pressure sensor 25 monitors the contact pressure of the float needle 22 and the insert 1 in real time, the mold clamping speed curve is automatically adjusted, and the injection is started after the mold clamping.

[0036] In the injection and pressure maintaining switching stage, according to the melt 100 flow analysis, the delay parameter is set, the PLC control system starts the hydraulic cylinder to retract 50-200ms before the injection signal is triggered, the float needle 22 is automatically retracted under the action of the spring, the melt 100 flow is avoided from being disturbed, and it needs to be noted that in this embodiment, the hydraulic cylinder is set to retract 50-200ms before the injection signal is triggered, and in other embodiments, different time settings can be selected according to different melts 100.

[0037] In the pressure maintaining stage, after the injection is completed, the hydraulic cylinder is completely retracted, the float needle 22 is reset under the action of the spring, the next mold clamping is prepared, and at the same time, the melt 100 fills and solidifies the gap left by the float needle 22.

[0038] As Figure 1 , Figure 2 and Figure 3As shown, further, the number of positioning mechanisms 2 is two or more groups, and symmetrically distributed on the outer periphery of the insert 1.

[0039] The utility model discloses a floating needle, drive assembly and the synergistic effect of PLC control system, realized the accurate positioning and automatic avoidance of insert in the injection molding process, significantly improved the injection molding quality and production efficiency. Its symmetrical distribution positioning mechanism, the closed loop control of pressure sensor and the timing control of PLC system, ensure the stability and reliability of injection molding process, has wide application prospect.

[0040] Finally, it should be noted that the above is only the preferred embodiment of the utility model, and is not used to limit the utility model, although the utility model is described in detail with reference to the foregoing embodiments, for those skilled in the art, still can modify the technical scheme recorded in the foregoing each embodiment, or equivalent replacement to part of technical features, any modification, equivalent replacement, improvement etc. that is made within the spirit and principles of the utility model, should be included in the protection scope of the utility model.

Claims

1. A non-sway injection mold with a floating needle positioning mechanism, comprising a front mold and a back mold, the molding surfaces of the front mold and the back mold enclose a molding cavity, and an insert (1) is arranged in the molding cavity, characterized in that: The opposite side of the insert (1) has a positioning mechanism (2), the positioning mechanism (2) comprises a guide sleeve (21) fixed in the injection mold, a float needle (22) is slidably connected in the guide sleeve (21), the front end of the float needle (22) is abuttingly connected with the insert (1) through the guide sleeve (21), the rear end of the float needle (22) is provided with a limiting step (22a), a reset elastic element (23) is arranged between the front end of the limiting step (22a) and the guide sleeve (21), the rear end of the float needle (22) is provided with a driving assembly (24), the driving assembly (24) is time-controlled by a PLC control system, and the output end of the driving assembly (24) is provided with a pressure sensor (25).

2. The anti-sway injection mold with floating needle positioning mechanism according to claim 1, characterized in that: The insert (1) is provided with a positioning hole, and the front end of the float needle (22) is provided with a guide conical surface corresponding to the positioning hole.

3. The anti-sway injection mold with floating needle positioning mechanism according to claim 2, characterized in that: The guide conical surface of the float needle (22) is in interference fit with the positioning hole of the insert (1).

4. The anti-sway injection mold with floating needle positioning mechanism according to claim 3, characterized in that: The positioning holes on the opposite side of the insert (1) are symmetrically arranged.

5. The anti-sway injection mold with floating needle positioning mechanism according to claim 4, characterized in that: The taper ratio of the guide conical surface is 1:30 to 1:

80.

6. The anti-sway injection mold with floating needle positioning mechanism according to claim 1, characterized in that: The number of the positioning mechanisms (2) is two or more, and they are symmetrically distributed on the periphery of the insert (1).

7. The anti-sway injection mold with floating needle positioning mechanism according to claim 1, characterized in that: The driving assembly (24) is a hydraulic cylinder.

8. The anti-sway injection mold with floating needle positioning mechanism according to claim 1, characterized in that: The reset elastic element (23) is a spring.

Images