CN219769010U - Ejector mechanism for threaded injection molding part - Google Patents

Abstract

The utility model relates to the field of injection molds, and discloses a threaded injection molding part ejection mechanism, which comprises a movable mold, a cavity insert with internal threads, a workpiece with external threads, a top plate positioned below the movable mold and a rotary mold core, and is characterized in that: the novel screw thread injection molding machine comprises a screw thread injection molding machine body, and is characterized by further comprising a synchronous driving assembly and an air passage arranged on the movable mold, wherein a plurality of cavity inserts are embedded in the movable mold, rotary mold cores are penetrated in the cavity inserts, the cross section of each rotary mold core is non-circular, the synchronous driving assembly drives the rotary mold cores to rotate simultaneously, the air passage is used for blowing out workpieces, the workpieces are prevented from being left on the mold cores to affect the molding of the next mold, and the traditional rotary ejection mechanism can exert excessive force on the workpieces when the threaded injection molding machine body is taken out, so that the workpieces are deformed or damaged, and particularly the workpieces with smaller screw thread depths are formed.

Description

Ejector mechanism for threaded injection molding part

Technical Field

The utility model relates to the field of injection molds, in particular to a threaded injection molding ejection mechanism.

Background

In injection molding, in which molten plastic is introduced into a cavity from a nozzle, cooled and solidified, and then the molded plastic product is removed from the cavity, in some injection molded products, it is necessary to form a screw structure on the surface or inside thereof to facilitate connection or fixation with other parts, such as bottle caps, nuts, pipe joints, etc., and to achieve this, it is necessary to provide a corresponding screw core in an injection mold to imprint a screw shape on the plastic product during injection molding. However, due to the special nature of the thread structure, the threaded injection molding product cannot be directly ejected from the mold core, and a certain mode is required to be adopted to realize the rotation and retraction of the threaded mold core, so that the threaded product can be smoothly demolded, and a special demolding mechanism is required to be used for the threaded injection molding product.

At present, various types of demoulding mechanisms for threaded injection molding parts are proposed and used, the rotation power of a hydraulic motor is utilized to convert the rotation power into the rotation of a threaded core, and the demoulding mechanism is suitable for products with large thread depth, small tooth form angle and high precision requirements.

Disclosure of Invention

The utility model aims to provide a threaded injection molding ejection mechanism so as to avoid deformation of a workpiece and realize automatic mold taking.

In order to achieve the above purpose, the utility model adopts the following technical scheme: the injection molding ejection mechanism with the threads comprises a movable die and a cavity insert with internal threads, and further comprises a screwing-off thread mechanism and an air passage arranged on the movable die, wherein the screwing-off thread mechanism comprises a rotary die core and a synchronous driving assembly, the movable die is embedded with a plurality of cavity inserts, the cavity inserts are internally provided with the rotary die cores in a penetrating mode, the synchronous driving assembly simultaneously drives the rotary die cores to rotate, the rotary die cores can drive a workpiece to rotate, and the air passage is used for blowing out the workpiece.

The effect of this scheme is: (1) the method comprises the steps that deformation of a workpiece is avoided, excessive force can be applied to the workpiece when the threaded injection molding piece is taken out by a traditional rotary ejection mechanism, the workpiece is deformed or damaged, and particularly for the workpiece with smaller thread depth of a molded workpiece, the workpiece can be blown through an air passage to slightly eject the workpiece, so that the workpiece is separated from a cavity, and then the workpiece is taken out by adopting a traditional thread rotary ejection mode; (2) the automatic die taking is realized, the air passage design in the scheme can blow out the workpiece by utilizing air pressure, the automatic die taking function is realized, the automatic die taking mechanism can reduce manual operation, improve the production efficiency, reduce the risk of manual operation errors, and avoid the workpiece from being left on the die core to influence the next die forming; (3) the production efficiency is improved, and the synchronous driving assembly is adopted, so that a plurality of rotary mold cores can be simultaneously subjected to ejection operation, a rapid and efficient ejection process is realized, and meanwhile, the automatic mold taking function further reduces the operation time and the production period, so that the production efficiency is remarkably improved.

Further, the synchronous drive assembly comprises a first gear, a second gear, a transmission shaft and a plurality of third gears, the third gears are coaxially and fixedly arranged on the rotary mold core, the third gears are meshed with the second gear, the second gear is coaxially and fixedly arranged at one end of the transmission shaft, and the first gear is fixedly arranged at the other end of the transmission shaft. The effect of this scheme is: the synchronous driving and rotation of a plurality of rotary mold cores are realized. Through the gear drive mechanism, when a first gear on the drive shaft rotates, it will transmit rotational force to a plurality of third gears on the rotating mold core through the meshed second gears. In this way, the plurality of rotary mold cores can rotate simultaneously, and the same ejection force is applied, so that balanced ejection of the threaded injection molding piece is ensured.

Further, a limiting block is fixed on the movable die. The effect of this scheme is: the limiting block can be matched with the fixed die, and the limiting block is used for limiting and preventing relative sliding when being buckled with the fixed die.

Further, the side wall of the cavity insert is also provided with an annular groove. The effect of this scheme is: the groove can be connected with a cooling water channel of the die to cool the cavity insert, so that the solidification time and temperature of plastic can be controlled, the quality of products can be guaranteed, meanwhile, an annular groove is formed on the cavity insert, and the annular groove is embedded into the movable die to form an annular cooling pipeline, so that the processing difficulty of drilling an annular hole in the movable die is lower.

Drawings

FIG. 1 is a schematic diagram of the overall structure of the present utility model;

FIG. 2 is an enlarged schematic view of the area a in FIG. 1;

FIG. 3 is a schematic view of the position of the rotary mold core during demolding.

Reference numerals illustrate: 1. a movable mold; 2. a cavity insert; 3. a workpiece; 4. a top plate; 5. rotating the mold core; 6. a synchronous drive assembly; 61. a third gear; 62. a second gear; 63. a transmission shaft; 64. a first gear; 7. an airway; 8. a limiting block; 9. an annular groove.

Detailed Description

The following is a further detailed description of the embodiments:

embodiment 1 is basically shown in fig. 1-3, and as shown in fig. 1, a threaded injection molding ejection mechanism includes a movable mold 1, a cavity insert 2 with internal threads, a workpiece 3 with external threads, a top plate 4 located below the movable mold 1, a rotating mold core 5 and a synchronous driving assembly 6, where, in this embodiment, a plurality of cavity inserts 2 are embedded in the movable mold 1, and each cavity insert 2 is penetrated with a rotating mold core 5, the cross-section of these rotating mold cores 5 is non-circular, so that the rotating mold core 5 can rotate the workpiece 3, alternatively, the cross-section of the rotating mold core 5 can be square, rectangular, etc., the workpiece 3 is rotated due to the action of the rotating mold core 5, and the threads of the rotating workpiece 3 can be matched with the threads of the cavity insert 2, so that the workpiece 3 is screwed out of the cavity insert 2, and as shown in fig. 2, the rotating mold core 5 is slidably connected with the workpiece 3, and the rotating axis of the rotating mold core 5 needs to be coaxial with the axis of the workpiece 3, and the ejection force can be applied to the workpiece 3 in a more uniform manner than that the threads of the threaded insert 3 are directly applied to the workpiece 3, so that the ejection force can be applied to the ejection force can be reduced.

As shown in fig. 3, in this embodiment, an air inlet channel 7 is further opened on the movable mold 1, air is introduced into the air inlet channel 7 through an external air source, when the workpiece needs to be demolded, the rotary mold core 5 can relatively move downwards for a certain distance, and then the air can enter into the molding cavity inside the cavity insert 2, and an acting force is applied to the workpiece 3, so that the workpiece 3 can be better separated from the molding surface of the cavity insert 2, or the workpiece 3 can be slightly jacked, at this time, the acting force is applied to the workpiece 3 through the rotation of the rotary mold core 5, and the rotary threaded workpiece 3 is screwed out of the cavity insert 2 due to the threaded fit with the cavity insert 2, and meanwhile, the air can also help the workpiece 3 to be better separated from the cavity insert 2, so that the incomplete separation is prevented, the manual intervention is required, and the workpiece can be prevented from being left on the mold core, and the next mold can be influenced.

In this embodiment, the synchronous driving assembly 6 includes a first gear 64, a second gear 62 and a transmission shaft 63, each rotary mold core 5 is coaxially and fixedly provided with a third gear 61, a plurality of third gears 61 are meshed with the second gear 62, the second gear 62 is coaxially and fixedly provided at one end of the transmission shaft 63, the other end of the transmission shaft 63 is fixedly provided with the first gear 64, and the gear transmission mechanism enables the rotary mold cores 5 to synchronously drive and rotate, thereby ensuring balanced ejection of the threaded injection molding.

A limiting block 8 is fixed on the movable die 1, the limiting block 8 can be matched with the fixed die, the two are ensured to be buckled and the relative sliding is limited, and the stability and the precision of the mechanism are improved.

In addition, the cavity insert 2 is further provided with an annular groove 9, and the annular groove is connected with a cooling water path of the die and is used for cooling the cavity insert 2. By controlling the flow of cooling water, the solidification time and temperature of the plastic can be regulated, and the quality and consistency of the product are improved. Meanwhile, the design of the annular groove 9 enables the cooling pipeline to be embedded therein, and the machining difficulty is lower than that of a mode of drilling holes in the movable die 1.

The foregoing is merely exemplary embodiments of the present utility model, and specific technical solutions and/or features that are well known in the art have not been described in detail herein. It should be noted that, for those skilled in the art, several variations and modifications can be made without departing from the technical solution of the present utility model, and these should also be regarded as the protection scope of the present utility model, which does not affect the effect of the implementation of the present utility model and the practical applicability of the patent. The protection scope of the present utility model is subject to the content of the claims, and the description of the specific embodiments and the like in the specification can be used for explaining the content of the claims.

Claims (4)

1. The utility model provides a take screw thread injection molding ejection mechanism, includes movable mould and has the die cavity inserts of internal thread, its characterized in that: the automatic forming machine is characterized by further comprising a screwing-off thread mechanism and an air passage arranged on the movable mould, wherein the screwing-off thread mechanism comprises a rotary mould core and a synchronous driving assembly, a plurality of cavity inserts are embedded in the movable mould, the rotary mould cores are penetrated in the cavity inserts, the synchronous driving assembly drives the rotary mould cores to rotate simultaneously, the rotary mould cores can drive a workpiece to rotate, and the air passage is used for blowing out the workpiece.

2. The threaded injection molding ejection mechanism of claim 1, wherein: the synchronous drive assembly comprises a first gear, a second gear, a transmission shaft and a plurality of third gears, wherein the third gears are coaxially and fixedly arranged on the rotary mold core, the third gears are meshed with the second gear, the second gear is coaxially and fixedly arranged at one end of the transmission shaft, and the first gear is fixedly arranged at the other end of the transmission shaft.

3. The threaded injection molding ejection mechanism of claim 1, wherein: and a limiting block is also fixed on the movable mould.

4. A threaded injection molding ejection mechanism as in claim 3 wherein: the side wall of the cavity insert is also provided with an annular groove.