Embedded nut anti-falling structure for injection mold

Abstract

The utility model discloses an embedded nut anti-dropping structure for an injection mold, which relates to the field of injection molds and comprises a mold body and an embedded nut, a positioning insert pin is arranged in the mold body, a groove is arranged at the front end of the positioning insert pin, a round wire spring is mounted in the groove, and a push plate is mounted in the positioning insert pin in a sliding manner. According to the utility model, under the action of the tension of the round wire spring, the round wire spring is clamped with the internal thread of the embedded nut, so that the thread groove of the embedded nut is clamped by the round wire spring, the situation that the embedded nut falls off in the mold closing process is effectively prevented, and the mold core of the mold body is greatly protected; and meanwhile, in the mold closing process, the mold can extrude the push rod in the positioning insert pin, so that the push rod drives the push plate to extrude the round wire spring, and at the moment, the limiting work on the embedded nut is relieved.

Description

Technical Field

[0001] The utility model relates to the field of injection molds, in particular to an anti-falling structure of embedded nuts for injection molds. Background Art

[0002] Plastic parts are a common component. The structural parts and appearance parts of many products often use plastic parts. As part of the product, plastic parts need to be connected with other parts. Screw connection is a commonly used connection method. Therefore, it is necessary to install embedded nuts when injecting plastic parts. Embedded injection molding is a process in which a metal nut is placed on a positioning pin and then the mold is closed for injection molding. After the injection molding is completed, the nut is fully wrapped by the plastic to achieve the match between the nut and the product.

[0003] The existing injection mold places the embedded nut directly on the positioning pin, and then the injection molding machine drives the mold to close the mold. The mold will vibrate during the closing process, and the embedded nut will shake along on the positioning pin. Since there is a clearance fit between the two, the embedded nut may fall off from the positioning pin during the closing process. At this time, the embedded nut falls into the mold during the closing process and crushes the mold.

[0004] In summary, the embedded nut of the above structure may fall off from the positioning pin during the mold closing process, and the mold core in the mold may be damaged during the subsequent mold closing process. Utility Model Content

[0005] Based on this, the purpose of the utility model is to provide an anti-falling structure for embedded nuts for injection molds, so as to solve the technical problem that the embedded nuts may fall off from the positioning pins during the mold closing process, which may cause damage to the mold core in the subsequent mold closing process.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an anti-falling structure for embedded nuts for injection molds, comprising a mold body and an embedded nut, a positioning pin is provided in the mold body, a groove is provided at the front end of the positioning pin, and a round wire spring is installed in the groove, and a push plate is slidably installed in the positioning pin.

[0007] By adopting the above technical solution, the round wire spring is engaged with the internal thread of the embedded nut under the action of the tension of the round wire spring, so that the round wire spring clamps the thread groove of the embedded nut, effectively preventing the embedded nut from falling off during the mold closing process, and greatly protecting the mold core of the mold body. At the same time, during the mold closing process, the mold will squeeze the push rod in the positioning pin, so that the push rod drives the push plate to squeeze the round wire spring, and at this time the limiting work on the embedded nut is released.

[0008] The utility model is further configured such that one end of the push plate is connected to a push rod, one end of the push rod passes through a positioning pin, and an inner groove for sliding of the push plate and the push rod is provided in the positioning pin.

[0009] By adopting the above technical solution, during the process of closing the mold body, the two sets of templates squeeze each other, at which time the push rod slides in the inner groove, thereby driving the push plate to move to one side to extrude the round wire spring.

[0010] The present invention is further configured such that the outer wall of the coil spring is arranged in an arc shape as a whole.

[0011] By adopting the above technical solution, the arc-shaped setting prevents the round wire spring from limiting the internal thread of the embedded nut when the plastic part and the embedded nut are subsequently removed. At the same time, the arc-shaped setting can ensure that the device limits the embedded nut through the tension of the round wire spring itself.

[0012] The present invention is further configured such that the inner diameter of the groove is larger than the inner diameter of the thread of the embedded nut.

[0013] By adopting the above technical solution, the round wire spring expands to the inner wall of the groove under the action of its own tension, while further ensuring the limiting work of the round wire spring on the internal thread of the embedded nut.

[0014] The present invention is further configured such that the inner wall of the inner groove is rough.

[0015] By adopting the above technical solution, the rough setting facilitates increasing the sliding friction between the two during the sliding process of the push rod, preventing the subsequent push rod from easily driving the push plate to reset.

[0016] The utility model is further configured such that the connection between the positioning pin and the embedded nut is smooth.

[0017] By adopting the above technical solution, the smooth setting makes it easy for the plastic part and the embedded nut to be removed from the positioning pin when the mold body is opened after the injection molding is completed.

[0018] The present invention is further configured such that the front end of the positioning pin is configured in a chamfered corner style.

[0019] By adopting the above technical solution, the rounded corner setting facilitates the guiding effect on the embedded nut, making it easier for the staff to quickly place the embedded nut on the positioning pin.

[0020] The present invention is further configured such that the friction force between the push rod and the inner groove is greater than the tension of the round wire spring itself.

[0021] By adopting the above technical solution, during the process of closing the mold body, the push rod will be pushed toward one side of the inner groove. When the mold body is subsequently opened, the push rod will not slide because its own friction force is greater than the tension of the round wire spring itself, thereby continuing to release the limiting work of the round wire spring on the embedded nut, making it easier for the plastic part and the embedded nut to be directly removed from the positioning pin.

[0022] The present invention is further configured such that the front end of the push rod and the front end of the positioning pin are arranged in a sealed shape.

[0023] By adopting the above technical solution, it is ensured that during the process of mold closing and injection molding of the mold body, plastic is effectively prevented from being injected into the inner groove of the positioning pin, thereby further improving the overall injection molding effect.

[0024] The present invention is further configured such that one end of the push plate is flexibly configured.

[0025] By adopting the above technical solution, the wear of the outer wall of the round wire spring can be reduced during the process of squeezing and pushing the round wire spring.

[0026] In summary, the present invention has the following beneficial effects:

[0027] The utility model provides a groove at the front end of the positioning pin, and a round wire spring is provided in the groove. Before the mold body is closed, the embedded nut is sleeved on the front end of the positioning pin. At this time, under the action of the tension of the round wire spring, the inner thread of the embedded nut is clamped with each other, so that the round wire spring clamps the thread groove of the embedded nut, effectively preventing the embedded nut from falling off during the mold closing process, and greatly protecting the mold core of the mold body. At the same time, during the mold closing process, the mold will squeeze the push rod in the positioning pin, so that the push rod drives the push plate to squeeze the round wire spring. At this time, the limiting work of the embedded nut is released, which is convenient for the embedded nut to fall off together with the plastic part when the mold is opened later. The push rod can be manually reset when the embedded nut is manually installed. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the overall structure of the mold of the present utility model;

[0029] Figure 2 This is a schematic diagram of the positioning pin and embedded nut structure of the utility model;

[0030] Figure 3 This is an exploded view of the positioning pin and embedded nut of the utility model;

[0031] Figure 4 For this utility model Figure 1 A magnified view of middle A;

[0032] Figure 5This is a cross-sectional view of the positioning pin of the present utility model.

[0033] In the figure: 1. Mold body; 2. Positioning pin; 3. Embedded nut; 4. Groove; 5. Round wire spring; 6. Push rod; 7. Inner groove; 8. Push plate. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0035] The following describes an embodiment of the present invention based on its overall structure. Example 1

[0036] An anti-falling structure for embedded nuts used in injection molds, such as Figure 1-Figure 5 As shown, it includes a mold body 1, a positioning pin 2, an embedded nut 3, a sealing mechanism, a limiting mechanism and a reset mechanism. A positioning pin 2 is provided in the mold body 1, and a groove 4 is provided at the front end of the positioning pin 2, and a round spring 5 is installed in the groove 4. When the embedded nut 3 is installed on the plastic part, the embedded nut 3 is sleeved on the front end of the positioning pin 2, and then the round spring 5 is tensioned by the internal thread of the round spring 5 and the embedded nut 3, so that the round spring 5 is clamped to the thread groove of the embedded nut 3. At this time, during the process of closing the mold body 1, the embedded nut 3 is effectively prevented from falling off, thereby greatly protecting the mold core in the mold body 1.

[0037] At the same time, a push plate 8 is slidably installed in the positioning pin 2, and one end of the push plate 8 is connected to a push rod 6, wherein one end of the push rod 6 passes through the positioning pin 2, and an inner groove 7 for sliding the push plate 8 and the push rod 6 is provided in the positioning pin 2. During the process of closing the mold body 1, the two sets of templates squeeze each other, and at this time the push rod 6 slides in the inner groove 7, thereby driving the push plate 8 to move to one side to squeeze the round wire spring 5. At this time, the limiting work on the embedded nut 3 is released, and the friction force between the push rod 6 and the inner groove 7 is greater than the tension of the round wire spring 5 itself. When the mold body 1 is subsequently opened, the friction force of the push rod 6 is greater than the tension of the round wire spring 5 itself, so the push rod 6 will not slide, thereby continuing to release the limiting work of the round wire spring 5 on the embedded nut 3, making it convenient for the plastic part and the embedded nut 3 to be directly removed from the positioning pin 2, and the subsequent push rod 6 can be manually reset when the embedded nut 3 is manually installed.

[0038] See also Figure 5The inner diameter of the groove 4 is larger than the inner diameter of the thread of the embedded nut 3. Under the action of the tension of the round wire spring 5 itself, it expands to the inner wall of the groove 4, and at the same time further ensures that the round wire spring 5 limits the inner thread of the embedded nut 3.

[0039] See also Figure 2 and Figure 3 The front end of the positioning pin 2 is chamfered, and the chamfered setting facilitates the guiding of the embedded nut 3, making it easy for the staff to quickly place the embedded nut 3 on the positioning pin 2. Example 2

[0040] like Figure 5 The shown embodiment is an anti-falling structure for embedded nuts for injection molds, and its overall structure is similar to that of Example 1, wherein the outer wall of the round wire spring 5 is arranged in an arc shape as a whole. The arc shape prevents the round wire spring 5 from limiting the internal thread of the embedded nut 3 when the plastic part and the embedded nut 3 are subsequently removed. At the same time, the arc shape can ensure that the device limits the embedded nut 3 through the tension of the round wire spring 5 itself.

[0041] The working principle of the present invention is as follows: a groove 4 is opened at the front end of the positioning pin 2, and a round wire spring 5 is placed in the groove 4. When the mold body 1 is opened, the staff will sleeve the embedded nut 3 on the front end of the positioning pin 2. At this time, under the tension of the round wire spring 5, the round wire spring 5 and the internal thread of the embedded nut 3 will be clamped with each other, effectively preventing the embedded nut 3 from falling off during the mold closing process. At the same time, during the mold closing process of the mold body 1, the push rod 6 in the positioning pin 2 will be squeezed, and the push plate 8 will be driven by the push rod 6 to squeeze the round wire spring 5. At this time, the round wire spring 5 itself will release the limiting clamping work on the embedded nut 3, which will facilitate the falling off of the embedded nut 3 and the plastic part from the positioning pin 2 during the subsequent mold opening. When the staff subsequently installs the embedded nut 3, they will reset the push rod 6 to facilitate the limiting work of a new set of embedded nuts 3.

[0042] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the present invention and are not limitations on the present invention. The specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and purpose of the present invention, but as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. An anti-falling structure for embedded nuts for injection molds, comprising a mold body (1) and embedded nuts (3), wherein a positioning pin (2) is provided in the mold body (1), and characterized in that: A groove (4) is provided at the front end of the positioning pin (2), and a round wire spring (5) is installed in the groove (4). A push plate (8) is slidably installed in the positioning pin (2).

2. The anti-falling structure of the embedded nut for injection mold according to claim 1, characterized in that: One end of the push plate (8) is connected to a push rod (6), one end of the push rod (6) passes through the positioning pin (2), and an inner groove (7) for the push plate (8) and the push rod (6) to slide is provided in the positioning pin (2).

3. The anti-falling structure of the embedded nut for injection mold according to claim 1, characterized in that: The outer wall of the round wire spring (5) is arranged in an arc shape as a whole.

4. The anti-falling structure of the embedded nut for injection mold according to claim 1, characterized in that: The inner diameter of the groove (4) is larger than the inner diameter of the thread of the embedded nut (3).

5. The anti-falling structure of the embedded nut for injection mold according to claim 2, characterized in that: The inner wall of the inner groove (7) is arranged in a rough shape.

6. The anti-falling structure of the embedded nut for injection mold according to claim 1, characterized in that: The connection between the positioning pin (2) and the embedded nut (3) is arranged in a smooth shape.

7. The anti-falling structure of the embedded nut for injection mold according to claim 1, characterized in that: The front end of the positioning pin (2) is arranged in a rounded shape.

8. The anti-falling structure of embedded nuts for injection molds according to claim 2, characterized in that: The friction force between the push rod (6) and the inner groove (7) is greater than the tension of the round wire spring (5) itself.

9. The anti-falling structure of the embedded nut for injection mold according to claim 2, characterized in that: The front end of the push rod (6) and the front end of the positioning pin (2) are arranged in a sealed manner.

10. The anti-falling structure of embedded nuts for injection molds according to claim 1, characterized in that: One end of the push plate (8) is flexibly arranged.

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