Double-layer nested core-pulling mechanism

Abstract

The invention 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 invention relates to the field of injection molds, and 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 undercut structures are located at the mold boundary or on the side of the product, it greatly increases the difficulty of demoulding. The conventional processing method is to demould through an external slider mechanism, but this structure can only achieve one core pulling and cannot handle such as 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. Summary of the invention

[0003] In order to overcome the above-mentioned defects of the prior art, the object 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 through secondary core pulling.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is:

[0005] A double-layer nested core-pulling mechanism comprises a slider and a driver connected to the slider and driving the slider to detach from a mold core. The core-pulling mechanism is located on one side of the mold core, and the detachment 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 and ejecting the workpiece 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 a direction to separate 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 also provided on the rear side of the slider. When the slider moves in a direction away 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, it further comprises a control rod connected to the slider, the control rod having a limiting structure, and when the slider completes the second stroke, the limiting structure abuts against the locking block to limit and continue to slide.

[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 oblique movement of the first push rod.

[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 also provided on the slider. When the slider is located in 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 double-layer nested core pulling mechanism provided by the present invention realizes a primary core pulling through a slider mechanism, and realizes a secondary core pulling in cooperation with a swing connecting rod mechanism nested in the slider mechanism, thereby completing the demoulding work of the undercut structure under a complex profile. 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 drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

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

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

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

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

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

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

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

[0025] In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "up", "down", "left", "right", "inside" and "outside" are 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 should not be understood as a limitation on the present invention.

[0026] The singular forms "a", "said" and "the" used in the specification include plural forms unless clearly indicated. The terms "include", "comprise" and "contain" used in the specification indicate the presence of the claimed features, but do not exclude the presence of one or more other features. The term "and / or" used in the specification includes any and all combinations of one or more of the relevant 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 is to 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 only used to distinguish one element from another element. Therefore, a first element may be referred to as a second element without departing from the teachings of the present application.

[0029] The following will describe 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 a variety of 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 more additional embodiments. In all drawings, the same reference numerals represent the same or functionally identical elements.

[0030] Figure 2 and Figure 3 A double-layer nested core pulling mechanism for use in an injection mold 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 realize 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 realize 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, and a pair of control rods 150 connected to the slider 110 are slidably arranged in the control rod guide groove 122, and a limiting structure 152 is arranged 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 arranged on the top of the base 120, and the sliding stroke completed by the slider 110 is limited by the contact between the limiting structure 152 and the locking block 140. Preferably, the limiting structure 152 is stepped. A protrusion 151 is arranged 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 for limiting, 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 push rod 161 inserted into the slider 110 and a pair of second push rods 163 located on both sides of the first push rod 161. The tails of the first push rod 161 and the second push rod 163 are hinged on a push rod seat 170 that is slidably mounted on the base 120 through the push rod seat guide groove 121. A gap is left between the push rod seat 170 and the slider 110, that is, when the slider 110 starts to slide into the first stroke, the first push rod 161 and the second push rod 163 are pushed outward from the slider 110. When the slider 110 completes the first stroke and enters the second stroke, the slider 110 contacts the push rod seat 170, driving the push rod seat 170 and the first push rod 161 and the second push rod 163 to move outward and slide away from the workpiece 1.

[0033] Combined with reference Figures 4 to 7, a first cavity 162 is provided at the end of the first ejector 161, and the first cavity 162 extends inward from the bottom opening of the first ejector 161, and a second cavity 164 is also provided at the end of the second ejector 163, and the opening of the second cavity 165 extends from the side of the ejector to the bottom. This design structure enables the first ejector 161 and the second ejector 163 to complete the demoulding action at the first undercut 2 and the second undercut 3 through a rotational movement in a direction different from the opening / closing direction. In this embodiment, the opening direction of the second cavity 164 faces the side away from the axis 101. The Z-direction position of the front end of the first ejector 161 is higher than that of the rear end thereof, so it is obliquely disposed in the slider 110, and a guide rod 165 slidably disposed in the ejector seat 170 is connected to the rear end of the first ejector 161. When the slider 110 is located in the first stroke and slides, the first ejector 161 is guided and lifted as the guide rod 165 slides in the ejector seat 170 during the ejection process. The ejector seat 170 is also provided with guide pins 170 extending toward both sides, and the connection hole 165 at the rear end of the second ejector 163 is sleeved on the guide pin 170, and the connection hole 165 is a waist hole, so that the second ejector 163 can realize lateral rotation around the guide pin 170. The second ejector 163 is configured to be laterally inclined, that is, the extension direction of its end is set to be opposite to the opening direction of the second cavity 165, so that when the slider 110 slides in the first stroke, the second ejector 163 drives the second cavity 165 to rotate in the opposite direction from the opening direction to demold, completing the secondary core pulling.

[0034] In a preferred embodiment, a groove 111 is provided at the rear side of the slider 110, and a transverse groove 112 is provided inside the slider 110 and is perpendicular to the groove 111. When the slider 110 is in the first stroke, the front end of the push rod seat 170 gradually goes deep into the groove 111, and the guide pin 170 slides in the transverse groove 112; when the slider 110 completes the first stroke and enters the second stroke, the push rod seat 170 contacts the slider 110 at the bottom end of the groove 111, and the guide pin 170 slides to the end of the transverse groove 112. This structure is conducive to the miniaturization of the 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, It is 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 as claimed in claim 1, It is characterized in that The core pulling mechanism also includes a connecting rod mechanism embedded in the slider and ejecting the workpiece through the sliding movement of the slider.

3. A double-layer nested core-pulling mechanism as claimed in claim 2, It is characterized in that The connecting rod mechanism comprises a first push rod inserted in the slider and a second push rod located at the side of the first push rod. When the slider moves in a direction away from the mold core and completes a 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 as claimed in claim 3, It is 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 in 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 as claimed in claim 4, It is characterized in that It also includes a control rod connected to the slider, the control rod has a limiting structure, and when the slider completes the second stroke, the limiting structure abuts against the locking block to limit the position and continue to slide.

6. A double-layer nested core-pulling mechanism as claimed in claim 4, It is 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 as claimed in claim 6, It is characterized in that A first cavity is arranged at the end of the first ejector pin, and a second cavity is arranged 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 as claimed in claim 7, It is characterized in that 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.

9. A double-layer nested core-pulling mechanism as claimed in claim 7, It is 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 as claimed in claim 9, It is 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.

Images