Double-layer nested core-pulling mechanism

Abstract

The utility model discloses a double-layer nested core-pulling mechanism, which comprises a sliding block and a driver which is connected with the sliding block and drives the sliding block to be separated from a mold core, and is characterized in that the core-pulling mechanism is positioned on one side of the mold core, and the separation direction of the sliding block is different from the opening / closing direction of the mold core. Primary core pulling is achieved through the sliding block mechanism, secondary core pulling is achieved in cooperation with the swing connecting rod mechanism embedded in the sliding block mechanism, and therefore demolding work of an undercut structure under a complex molded surface is completed.

Description

Technical Field

[0001] The utility model relates to the field of injection molds, in particular to a double-layer nested core-pulling mechanism. Background Art

[0002] In some consumer products, in order to meet the needs of product functions, some buckles and undercuts are often designed on the products. Especially when these undercuts are located at the mold boundary or on the side of the product, it greatly increases the difficulty of demoulding. The conventional solution is to demould through an external slider mechanism, but this structure can only achieve one-time core pulling and cannot handle such situations. Figure 1 The core pulling and demoulding work under the tongue-shaped first undercut 2 and second undercut 3 structure with complex surface is shown. Utility Model Content

[0003] In order to overcome the above-mentioned defects of the prior art, the purpose of the present invention is to provide a double-layer nested core-pulling mechanism, which can realize the demoulding of the tongue-shaped undercut structure by secondary core pulling.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] A double-layer nested core-pulling mechanism includes a slider and a driver connected to the slider and driving the slider to separate from a mold core. The core-pulling mechanism is located on one side of the mold core, and the separation direction of the slider is different from the opening / closing direction of the mold core.

[0006] In a preferred embodiment of the present invention, the core-pulling mechanism further includes a connecting rod mechanism nested in the slider, which pushes the workpiece out through the sliding movement of the slider.

[0007] In a preferred embodiment of the present invention, the connecting rod mechanism has a first push rod inserted into the slider and a second push rod located on the side of the first push rod. When the slider moves in the direction of separating from the mold core and completes the first stroke, the first push rod and the second push rod are ejected from the front of the slider.

[0008] In a preferred embodiment of the present invention, a push rod seat connected to the first push rod and the second push rod is further provided on the rear side of the slider. When the slider moves in the direction of separating from the mold core and enters the second stroke, the slider pushes the push rod seat to cause the first push rod and the second push rod to move in the same direction.

[0009] In a preferred embodiment of the present invention, a control rod connected to the slider is further included. The control rod has a limiting structure. When the slider completes the second stroke, the limiting structure abuts against the locking block to limit the continued sliding.

[0010] In a preferred embodiment of the present invention, the first push rod and the second push rod are hinged on the push rod seat.

[0011] In a preferred embodiment of the present invention, a first cavity is provided at the end of the first push rod, and a second cavity is provided at the end of the second push rod, and the opening directions of the first cavity and the second cavity are respectively opposite to the swinging directions of the first push rod and the second push rod.

[0012] In a preferred embodiment of the present invention, the first push rod is connected to a guide rod, and the guide rod is slidably placed in the push rod seat to assist the first push rod in oblique movement.

[0013] In a preferred embodiment of the present invention, the second push rod is connected to the guide pin on the push rod seat through a connecting hole.

[0014] In a preferred embodiment of the present invention, a groove and a transverse groove for accommodating the movement of the guide pin are further provided on the slider. When the slider is located within the first stroke, the guide pin slides in the transverse groove and the push rod seat slides toward the groove. When the slider is located at the critical point between the first stroke and the second stroke, it contacts the slider in the groove, and the guide pin contacts the end of the transverse groove to limit the position.

[0015] The beneficial effects of the present invention are:

[0016] The utility model provides a double-layer nested core pulling mechanism, which realizes primary core pulling through a slider mechanism and secondary core pulling in conjunction with a swing connecting rod mechanism nested in the slider mechanism, thereby completing the demoulding work of the undercut structure under a complex surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art.

[0018] Figure 1 It is a schematic diagram of a workpiece involved in the utility model.

[0019] Figure 2 It is a schematic diagram of the relationship between the utility model and the mold.

[0020] Figure 3 It is an exploded view of the present utility model.

[0021] Figure 4 It is a schematic diagram of the end of the ejector rod.

[0022] Figure 5 This is the structural section of the push rod and slider Figure 1 .

[0023] Figure 6 This is the structural section of the push rod and slider Figure 2 .

[0024] Figure 7 It is a cross-sectional view of the present utility model. DETAILED DESCRIPTION

[0025] In the description of the present invention, it should be noted that the terms "up", "down", "left", "right", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. The above description is simplified for the convenience of describing the present invention, and does not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, it cannot be understood as a limitation on the present invention.

[0026] As used in this specification, the singular forms "a," "an," "said," and "the" include the plural forms unless otherwise expressly stated. The terms "include," "comprise," and "contain" as used in this specification indicate the presence of the claimed features, but do not exclude the presence of one or more additional features. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0027] In the specification, when an element is referred to as being “on,” “fixed” to, “connected to,” “engaged to,” or the like, the element may be directly on, fixed to, connected to, engaged to, or contacting the other element, or intervening elements may be present.

[0028] It will be understood that although the terms "first," "second," etc. may be used herein to describe different elements, these elements should not be limited by these terms. These terms are merely used to distinguish one element from another. Thus, a first element may be referred to as a second element without departing from the teachings of the present invention.

[0029] The following describes exemplary embodiments of the present application with reference to the accompanying drawings. However, it should be understood that the present application can be presented in many different ways and is not limited to the embodiments described below. It should also be understood that the embodiments disclosed herein can be combined in various ways to provide many additional embodiments. In all figures, the same reference numerals represent the same elements or elements with the same function.

[0030] Figure 2 and Figure 3A double-layer nested core pulling mechanism for injection molds is shown. The core pulling mechanism 100 is placed on the side of the mold core 10, and its core pulling movement axis 101 is in a different direction from the opening / closing direction of the mold. Therefore, this core pulling mechanism 100 cannot be directly integrated into the mold core 10.

[0031] The core pulling mechanism 100 mainly includes a slider 110 and a driver 130 connected thereto for driving the sliding movement to achieve a primary core pulling, and a connecting rod mechanism arranged at the rear side of the slider 110 and sliding with the slider 110 to achieve a secondary core pulling. The entire core pulling mechanism 100 is fixed by a base 120 fixed to the side of the mold core 10. A pair of control rods 150 connected to the slider 110 are slidably provided in the control rod guide groove 122. A limiting structure 152 is provided on the upper surface of the control rod 150. When the control rod 150 slides with the slider 110, the limiting structure 152 moves toward the locking block 140 provided on the top of the base 120. The contact between the limiting structure 152 and the locking block 140 limits the sliding travel of the slider 110. Preferably, the limiting structure 152 is stepped. A protrusion 151 is provided downward at the tail of the control rod 150. When the slider 110 is in the starting position, the protrusion 151 contacts the first switch 131 to notify the control system that the driver 130 and the slider 110 are in the initial position; when the limiting structure 152 contacts the locking block 140 to limit the position, the protrusion 151 contacts the second switch 132 to notify the control system that the driver 130 and the slider 110 are in the maximum sliding position, thereby locking the driver 130.

[0032] The connecting rod mechanism includes a first ejector rod 161 that passes through the slider 110 and a pair of second ejector rods 163 located on either side of the first ejector rod 161. The tail ends of the first ejector rod 161 and the second ejector rod 163 are hinged on an ejector rod seat 170 that is slidably mounted on the base 120 through an ejector rod seat guide groove 121. A gap is left between the ejector rod seat 170 and the slider 110. That is, when the slider 110 begins to slide into the first stroke, the first ejector rod 161 and the second ejector rod 163 are ejected outward from the slider 110. When the slider 110 completes the first stroke and enters the second stroke, the slider 110 contacts the ejector rod seat 170, driving the ejector rod seat 170 and the first and second ejector rods 161, 163 to slide outward and separate from the workpiece 1.

[0033] Combined with reference Figures 4 to 7A first cavity 162 is provided at the end of the first ejector pin 161, extending inward from the bottom opening of the first ejector pin 161. A second cavity 164 is also provided at the end of the second ejector pin 163, with the opening of the second cavity 165 extending from the side of the ejector pin toward the bottom. This design allows the first and second ejector pins 161 and 163 to complete the demolding operation at the first undercut 2 and second undercut 3 through rotational motion in a direction different from that of mold opening and closing. In this embodiment, the opening of the second cavity 164 faces away from the axis 101. The front end of the first ejector pin 161 is positioned higher in the Z direction than the rear end, and is therefore tilted within the slider 110. A guide rod 165, slidably mounted within the ejector pin seat 170, is connected to the rear end of the first ejector pin 161. When the slider 110 slides within the first stroke, the first ejector pin 161 is guided and lifted as the guide rod 165 slides within the ejector pin seat 170 during ejection. Guide pins 170 extending outward from both sides are also provided on the ejector seat 170. The connecting hole 165 at the rear end of the second ejector 163 is sleeved onto the guide pins 170. The connecting hole 165 is a waist-shaped hole, allowing the second ejector 163 to rotate laterally about the guide pins 170. The second ejector 163 is configured to be laterally tilted, with its end extending in the opposite direction of the opening of the second cavity 165. Therefore, when the slider 110 slides within the first stroke, the second ejector 163 drives the second cavity 165 to rotate in the opposite direction of the opening to release the mold, completing the secondary core pulling.

[0034] In a preferred embodiment, a groove 111 is defined on the rear side of the slider 110, and a transverse groove 112 is defined therethrough, perpendicular to the groove 111. When the slider 110 is in its first travel, the front end of the push rod seat 170 gradually penetrates into the groove 111, and the guide pin 170 slides within the transverse groove 112. When the slider 110 completes its first travel and enters its second travel, the push rod seat 170 contacts the slider 110 at the bottom of the groove 111, and the guide pin 170 slides to the end of the transverse groove 112. This structure facilitates a compact overall mechanism.

Claims

1. A double-layer nested core pulling mechanism, comprising a slider and a driver connected to the slider and driving the slider to separate from the mold core, characterized in that: The core-pulling mechanism is located on one side of the mold core, and the disengagement direction of the slider is different from the opening / closing direction of the mold core.

2. A double-layer nested core-pulling mechanism according to claim 1, characterized in that: The core-pulling mechanism further includes a connecting rod mechanism nested in the slider and configured to push the workpiece out through the sliding movement of the slider.

3. A double-layer nested core-pulling mechanism according to claim 2, characterized in that: The connecting rod mechanism includes a first push rod inserted into the slider and a second push rod located on the side of the first push rod. When the slider moves toward the direction of separating from the mold core and completes the first stroke, the first push rod and the second push rod are ejected from the front of the slider.

4. A double-layer nested core-pulling mechanism according to claim 3, characterized in that: A push rod seat connected to the first push rod and the second push rod is also provided on the rear side of the slider. When the slider moves toward the direction of leaving the mold core and enters the second stroke, the slider pushes the push rod seat to make the first push rod and the second push rod move in the same direction.

5. A double-layer nested core-pulling mechanism according to claim 4, characterized in that: It also includes a control rod connected to the slider, the control rod has a limiting structure, when the slider completes the second stroke, the limiting structure abuts against the locking block to limit the continued sliding.

6. A double-layer nested core-pulling mechanism according to claim 4, characterized in that: The first push rod and the second push rod are hinged on the push rod seat.

7. A double-layer nested core-pulling mechanism according to claim 6, characterized in that: A first cavity is provided at the end of the first ejector pin, and a second cavity is provided at the end of the second ejector pin. The opening directions of the first cavity and the second cavity are respectively opposite to the swinging directions of the first ejector pin and the second ejector pin.

8. A double-layer nested core-pulling mechanism according to claim 7, characterized in that: The first push rod is connected to the guide rod, and the guide rod is slidably placed in the push rod seat to assist the first push rod in oblique movement.

9. A double-layer nested core-pulling mechanism according to claim 7, characterized in that: The second push rod is connected to the guide pin on the push rod seat through a connecting hole.

10. A double-layer nested core-pulling mechanism according to claim 9, characterized in that: The slider is also provided with a groove and a transverse groove for accommodating the movement of the guide pin. When the slider is located within the first stroke, the guide pin slides in the transverse groove and the push rod seat slides toward the groove. When the slider is located at the critical point between the first stroke and the second stroke, it contacts the slider in the groove, and the guide pin contacts the end of the transverse groove to limit the position.

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