CN218366263U - Internal thread injection mold - Google Patents

Abstract

The utility model discloses an internal thread injection mold, which relates to the technical field of injection molds and comprises an upper mold and a lower mold which are mutually butted, a glue inlet system arranged on the upper mold and an ejection mechanism arranged on the lower mold, wherein an upper mold core is fixedly arranged on the upper mold, a lower mold core is fixedly arranged on the lower mold, an upper mold core and the lower mold core are mutually covered to form a mold cavity for molding products, the glue inlet system is butted and matched with the upper mold core, and the ejection mechanism is butted and matched with the lower mold core; the upper die is provided with a thread core and a driving device, the thread core is in butt joint with the die cavity, the driving device is used for driving the thread core to perform linear motion on the upper die, so that the thread core is in butt joint with the die cavity or separated from the die cavity, and the side wall of the thread core is provided with threads for forming internal threads of a product; the utility model discloses a be provided with thread core and drive arrangement, can effectively avoid the surface of drawing of patterns back product impaired, the condition that can not reach the standard requirement takes place, has improved the yields of product widely.

Description

Internal thread injection mold

Technical Field

The utility model relates to an injection mold technical field specifically is an internal thread injection mold.

Background

The mould is various moulds and tools for obtaining required products by injection molding, blow molding, extrusion, die casting or forging forming, smelting, stamping and other methods in industrial production. In short, a mold is a tool used to make a shaped article, the tool being made up of various parts, different molds being made up of different parts. The surface of an article is processed mainly by changing the physical state of a formed material, and the article is called as an industrial mother. An injection mold is a tool for producing plastic products, and generally comprises an upper mold and a lower mold, wherein the upper mold and the lower mold are closed to form a runner system and a mold cavity of the plastic products during injection molding. During injection molding, the mold is clamped on an injection molding machine, molten plastic is injected into the mold cavity and is cooled and molded in the mold cavity, meanwhile, the molten plastic is also cooled in the runner system to form runner system condensate, the upper mold and the lower mold are separated after the plastic product is molded, the plastic product is ejected out of the mold cavity through the ejection system and leaves the mold, finally, the upper mold and the lower mold are closed again for next injection molding, and the whole injection molding process is carried out in a circulating manner.

At present, when a plastic product with internal threads is subjected to injection molding, a thread core with external threads is generally used, the internal threads of the product are processed through the thread core, the injection molding production of the product is completed under the combined action of the thread core and a mold cavity, and then the thread core is separated from the product in a mode of rotating the thread core, so that the demolding of the product is completed; however, in the prior art, there is a certain problem in the injection mold for the internal thread, when the plastic product is separated from the screw core, the screw core is separated from the plastic product by rotating the screw core, so that the plastic product cannot rotate, the plastic product is generally limited by the mold cavity and cannot rotate, specifically, the surface of the plastic product is generally abutted against the mold cavity, and therefore, the surface of the plastic product is inevitably affected, and the plastic product which is demolded easily cannot meet the standard requirement; furthermore, the die is not limited in the stroke of the thread core, which easily causes the butt joint of the thread core and the die cavity to be not in place, and the glue positions of the thread core and the die core cannot be sealed, thereby affecting the installation quality of the die and the quality of a subsequent product to be processed and formed. In view of the above, there is a need for an improved solution to solve the above problems.

SUMMERY OF THE UTILITY MODEL

The utility model discloses an it is not enough to overcome above-mentioned condition, aims at providing the technical scheme that can solve above-mentioned problem.

An internal thread injection mold comprises an upper mold and a lower mold which are mutually butted, a glue feeding system arranged on the upper mold and an ejection mechanism arranged on the lower mold, wherein an upper mold core is fixedly arranged on the upper mold, a lower mold core is fixedly arranged on the lower mold, an upper mold core and the lower mold core are mutually covered to form a mold cavity for molding a product, the glue feeding system is in butt joint fit with the upper mold core, and the ejection mechanism is in butt joint fit with the lower mold core;

the upper die is provided with a screw core and a driving device, the screw core is in butt joint with the die cavity, the driving device is used for driving the screw core to perform linear motion on the upper die, the screw core is in butt joint with the die cavity or separated from the die cavity, threads are formed in the side wall of the screw core, internal threads for forming a product are used, a shaft sleeve is sleeved on the screw core and used for guiding and butting the screw core in the die cavity, the shaft sleeve is fixedly connected onto the upper die and abutted against the upper die core, a first limiting groove corresponding to the screw core is formed in the glue feeding system, a rotating stopping ring matched with the product in a clamping mode is arranged on the lower die core, a plurality of arc notches are formed in the edge of the rotating stopping ring along the circumferential direction, a second limiting groove corresponding to the screw core is formed in the center of the rotating stopping ring, and the first limiting groove and the second limiting groove are both used for limiting the moving distance of the screw core performing linear motion on the upper die.

As a further aspect of the present invention: supreme butt joint in proper order is followed to the thread core down in the accepting part in the second spacing groove, a first external screw thread portion for the shaping product internal screw thread, be used for with last mould benevolence butt joint complex butt joint portion, a pivot that is used for bearing portion with axle sleeve sliding fit and is used for being connected with drive arrangement power, the upper end of pivot is equipped with second external screw thread portion, threaded connection has the thread bush on the second external screw thread portion, thread bush fixed connection is on last mould, the thread core is through the pivot and the threaded connection of thread bush on last mould linear motion.

As a further aspect of the present invention: the thread sleeve is provided with an internal tooth channel in threaded connection with the second external thread part, the glue inlet system comprises a squirt nozzle, a first limiting groove is arranged on the squirt nozzle, and the first limiting groove is positioned right above the internal tooth channel.

As a further aspect of the present invention: the butt joint part comprises a circular table part connected with the bearing part and a first annular part connected with the bearing part, wherein the cross section of the circular table part gradually shrinks from one end of the circular table part connected with the first annular part to one end of the circular table part connected with the bearing part.

As a further aspect of the present invention: the bearing part comprises a bearing boss butted with the second limiting groove and a second annular part connected with the first external thread part, wherein the second annular part is abutted and matched with the rotation stopping ring, and the cross section of the bearing boss gradually shrinks towards the end, far away from the second annular part, of the bearing boss from the end, connected with the second annular part, of the bearing boss.

As a further aspect of the present invention: the driving device comprises a rotary driving assembly for driving the thread core to perform linear motion on the upper die and a linear driving assembly for being in power connection with the rotary driving assembly.

As a further aspect of the present invention: the rotary driving assembly comprises a power gear set in power connection with the linear driving assembly and a first gear coaxially arranged on the thread core, and the first gear is meshed with the power gear set for transmission.

As a further aspect of the present invention: the first gear is connected with the rotating shaft key.

As a further aspect of the utility model: the linear driving assembly comprises a rack and a power part for driving the rack to linearly move, the power gear set comprises a second gear in meshing transmission with the rack and a third gear in key connection with the second gear, and the first gear and the third gear are in meshing transmission.

As a further aspect of the present invention: the power part is a pneumatic cylinder or a hydraulic lever.

Compared with the prior art, the beneficial effects of the utility model are as follows:

the utility model discloses a be equipped with screw tooth core and drive arrangement on the upper die, after the compound die of upper die and lower mould, drive arrangement drive screw tooth core gets into the die cavity, wherein, receive the guide effect of the axle sleeve of fixed connection on the terminal surface of upper die core, and the axle sleeve slides and cup joints on screw tooth core, make screw tooth core along the axle sleeve can accurate butt joint in the die cavity, and offset on the second spacing groove, thereby accomplished the butt joint of screw tooth core and die cavity; when a product is injection molded, the internal thread structure of the product is molded through the threads on the side wall of the thread core, and a plurality of arc-shaped notches are formed along the circumferential direction through the edge of the rotation stopping ring, so that the product is molded with a plurality of convex structures (not shown in the figure) matched with the arc-shaped notches; after a product is formed, the driving device drives the screw tooth mold core to be separated from the mold cavity, and the product is clamped on the rotation stop ring due to the clamping of the protruding structure and the arc-shaped notch, so that the circumferential limiting is realized, the product can be firmly limited in the mold cavity in the process that the screw tooth mold core rotates out of the mold cavity, and the separation of the screw tooth mold core and the product is facilitated; compared with the mode that the surface of the product is abutted against the die cavity in the prior art, so that the product is limited in the die cavity, the utility model can effectively avoid the surface of the product from being damaged after demoulding, and the condition that the standard requirement cannot be met occurs, thereby greatly improving the yield of the product;

in addition, in the process that the driving device drives the screw core to be separated from the die cavity, the screw core rotates along the shaft sleeve and is limited by the first limiting groove right above the screw core, so that the screw core is tightly abutted against the first limiting groove, and the separation of the screw core and the die cavity is completed; the utility model discloses a screw tooth core offsets with the second spacing groove, the corotation location of screw tooth core has been accomplished, make the novel butt joint of screw tooth in the die cavity, through the counterbalance of screw tooth core and first spacing groove, the reversal location of screw tooth core has been accomplished, make the screw tooth core separate in the die cavity, thereby limited the displacement distance that the screw tooth core carries out linear motion on the upper die, the displacement travel that the screw tooth core carries out linear motion is fixed as the linear distance of first spacing groove and second spacing groove, thereby effectively avoided not having the stroke restriction to the screw tooth core on the mould, this leads to the butt joint of screw tooth core and die cavity not in place very easily, lead to the unable glue of glue position department of screw tooth core and mould benevolence to seal, influence the problem emergence of the installation quality of mould and the quality of follow-up required machine-shaping product; the utility model has the advantages of reasonable design, the practicality is strong, is worth promoting.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

Fig. 1 is a schematic structural diagram of the present invention;

FIG. 2 is a schematic view of the structure of the driving device and the thread core on the upper mold according to the present invention;

FIG. 3 is a schematic view of the structure of FIG. 2 with the upper die removed;

FIG. 4 is an enlarged schematic view of FIG. 3 at "A";

FIG. 5 is a schematic structural view of the middle thread core of the present invention;

FIG. 6 is a schematic structural view of the middle and lower mold cores of the present invention;

fig. 7 is a schematic structural view of the middle thread core of the present invention on the lower mold core;

fig. 8 is a schematic sectional view of the present invention.

The reference numerals and names in the figures are as follows:

1. an upper die; 2. a lower die; 3. a glue feeding system; 4. an ejection mechanism; 5. an upper die core; 6. a lower die core; 7. a thread core; 8. a drive device; 9. a shaft sleeve; 10. a first limit groove; 11. a second limit groove; 12. a receiving part; 13. a first external threaded portion; 14. a butt joint part; 15. a bearing portion; 16. a rotating shaft; 17. a second external thread portion; 18. a thread sleeve; 19. an internal tooth channel; 20. a squirt nozzle; 21. a circular table portion; 22. a first annular portion; 23. a rotary drive assembly; 24. a linear drive assembly; 25. a power gear set; 26. a first gear; 27. a rack; 28. a power member; 29. a second gear; 30. a third gear; 31. a rotation stopping ring; 32. an arc-shaped notch; 33. receiving the boss; 34. a second annular portion; 35. a mold cavity.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.

Referring to fig. 1-8, in an embodiment of the present invention, an internal thread injection mold includes an upper mold 1 and a lower mold 2 that are butted against each other, a glue feeding system 3 disposed on the upper mold 1, and an ejection mechanism 4 disposed on the lower mold 2, wherein an upper mold core 5 is fixedly mounted on the upper mold 1, a lower mold core 6 is fixedly mounted on the lower mold 2, the upper mold core 5 and the lower mold core 6 cover each other to form a mold cavity 35 for molding a product, the glue feeding system 3 is in butt-joint fit with the upper mold core 5, and the ejection mechanism 4 is in butt-joint fit with the lower mold core 6;

the upper die 1 is provided with a screw core 7 and a driving device 8, the screw core 7 is in butt joint with the die cavity 35, the driving device 8 is used for driving the screw core 7 to perform linear motion on the upper die 1, the screw core 7 is in butt joint with the die cavity 35 or separated from the die cavity 35, threads are formed in the side wall of the screw core 7 and used for forming internal threads of a product, a shaft sleeve 9 is sleeved on the screw core 7 and used for guiding the screw core 7 to be in butt joint with the die cavity 35, the shaft sleeve 9 is fixedly connected onto the upper die 1, the shaft sleeve 9 abuts against the upper die core 5, a first limiting groove 10 corresponding to the screw core 7 is formed in the glue inlet system 3, a rotation stopping ring 31 matched with the product in a clamping mode is arranged on the lower die core 6, the edge of the rotation stopping ring 31 is provided with a plurality of arc notches 32 along the circumferential direction, a second limiting groove 11 corresponding to the screw core 7 is formed in the center of the rotation stopping ring 31, and the first limiting groove 10 and the second limiting groove 11 are used for limiting the movement distance of the screw core 7 performing linear motion on the upper die 1.

In the above technical means, the utility model discloses a be equipped with screw core 7 and drive arrangement 8 on last mould 1, after last mould 1 and lower mould 2 compound die, drive arrangement 8 drive screw core 7 gets into die cavity 35, wherein, receives the guide effect of axle sleeve 9 of fixed connection on 5 terminal surfaces of upper mould benevolence, and axle sleeve 9 slides and cup joints on screw core 7, makes screw core 7 accurately dock in die cavity 35 along axle sleeve 9, and offsets on second spacing groove 11, thereby has accomplished the butt joint of screw core 7 and die cavity 35; when a product is injection molded, the thread on the side wall of the thread core 7 is used for molding the internal thread structure of the product, and a plurality of arc-shaped notches 32 are formed along the circumferential direction through the edge of the rotation stop ring 31, so that the product is molded with a plurality of convex structures (not shown in the figure) matched with the arc-shaped notches 32; after the product is molded, the driving device 8 drives the screw core 7 to be separated from the mold cavity 35, and the product is clamped on the rotation stop ring 31 due to the clamping of the protruding structure and the arc-shaped notch 32, so that the circumferential limiting is realized, and the product can be firmly limited in the mold cavity 35 in the process that the screw core 7 rotates out of the mold cavity 35, so that the separation of the screw core 7 and the product is facilitated; compared with the mode that the surface of the product is abutted against the die cavity 35 in the prior art, so that the product is limited in the die cavity 35, the utility model can effectively avoid the surface of the product from being damaged after demoulding, and the condition that the standard requirement cannot be met occurs, thereby greatly improving the yield of the product;

furthermore, in the process that the driving device 8 drives the screw core 7 to separate from the die cavity 35, the screw core 7 rotates along the shaft sleeve 9 and is limited by the first limiting groove 10 right above the screw core 7, so that the screw core 7 is tightly pressed against the first limiting groove 10, and the separation of the screw core 7 and the die cavity 35 is completed; the utility model discloses a counterbalance of screw tooth core 7 and second spacing groove 11, the corotation location of screw tooth core 7 has been accomplished, make the novel butt joint of screw tooth in die cavity 35, through the counterbalance of screw tooth core 7 and first spacing groove 10, the reversal location of screw tooth core 7 has been accomplished, make screw tooth core 7 separate in die cavity 35, thereby limited the displacement distance that screw tooth core 7 carries out linear motion on last mould 1, the displacement travel that screw tooth core 7 carries out linear motion is fixed as the linear distance of first spacing groove 10 and second spacing groove 11, thereby effectively avoided not having the stroke restriction to screw tooth core 7 on the mould, this leads to the butt joint of screw tooth core 7 and die cavity 35 not in place very easily, lead to the unable glue position department of screw tooth core 7 and mould benevolence, influence the problem emergence of the installation quality of mould and the quality of follow-up required machine-shaping product; the utility model has the advantages of reasonable design, the practicality is strong, is worth promoting.

In the embodiment of the present invention, the screw core 7 sequentially includes, from bottom to top, a receiving portion 12 butted to the second limiting groove 11, a first external thread portion 13 for forming an internal thread of a product, a butting portion 14 butted and matched with the upper mold core 5, a bearing portion 15 slidably matched with the shaft sleeve 9, and a rotating shaft 16 for power connection with the driving device 8, the upper end of the rotating shaft 16 is provided with a second external thread portion 17, the second external thread portion 17 is screwed with a screw sleeve 18, the screw sleeve 18 is fixedly connected to the upper mold 1, and the screw core 7 is connected to the upper mold 1 through the rotating shaft 16 and the screw sleeve 18 to perform linear motion;

the thread sleeve 18 is provided with an internal tooth channel 19 in threaded connection with the second external thread portion 17, the glue inlet system 3 comprises a squirt 20, the first limiting groove 10 is arranged on the squirt 20, and the first limiting groove 10 is positioned right above the internal tooth channel 19.

The utility model discloses in, 7 docks in die cavity 35 or separate in this in-process of die cavity 35 at thread core, second external screw thread portion 17 threaded connection all the time is on internal tooth channel 19, play the supporting role to thread core 7 all the time with guaranteeing thread sleeve 18, make thread core 7 guarantee vertical state all the time simultaneously, thereby avoid thread core 7 to dock when die cavity 35, thread core 7 breaks away from in thread sleeve 18, the condition of idle running takes place on second spacing groove 11, also avoid thread core 7 to separate when die cavity 35 simultaneously, produce the swing when thread core 7 docks with thread sleeve 18 again, cause the condition of product fracture to take place easily.

The embodiment of the utility model provides an in, butt joint portion 14 is including connecting in the round platform portion 21 of accepting portion 12 and connecting in the first annular portion 22 of bearing portion 15, wherein, the cross section of round platform portion 21 is followed the one end that round platform portion 21 and first annular portion 22 are connected and is shrunk to the one end that round platform portion 21 and accepting portion 12 are connected gradually, through this design, first annular portion 22 is used for sealing up the cooperation with die cavity 35, prevents to overflow and glues, and round platform portion 21 is big-end-up, is convenient for get into in die cavity 35 with the guide of thread core 7.

In the embodiment of the present invention, the receiving portion 12 includes a receiving boss 33 abutting on the second limiting groove 11 and a second annular portion 34 connected to the first external thread portion 13, wherein the second annular portion 34 is abutted against the rotation stopping ring 31, and the cross section of the receiving boss 33 gradually shrinks from the end of the receiving boss 33 connected with the second annular portion 34 to the end of the receiving boss 33 away from the second annular portion 34; the second annular portion 34 can abut against the central position of the rotation preventing ring 31, that is, the rotation preventing ring 31 does not abut against the arc notch 32, so as to prevent the second annular portion 34 from pulling the convex structure of the product when the screw tooth core 7 is separated from the mold cavity 35, wherein the convex structure of the product can be an essential feature of the product, and can also be an unnecessary feature, and when the convex structure is an unnecessary feature, the appearance of the product can not be affected, and the normal use of the product can not be affected by molding the convex structure in the product; through the setting of the big end down of the bearing platform, the bearing platform is convenient to dock or separate from the second limit groove 11.

In the embodiment of the present invention, the driving device 8 includes a rotary driving assembly 23 for driving the screw core 7 to perform linear motion on the upper die 1 and a linear driving assembly 24 for being dynamically connected with the rotary driving assembly 23.

In the embodiment of the present invention, the rotary driving assembly 23 includes a power gear set 25 connected to the linear driving assembly 24 and a first gear 26 coaxially installed on the thread core 7, and the first gear 26 is engaged with the power gear set 25 for transmission.

In the embodiment of the present invention, the first gear 26 is connected with the rotating shaft 16 key.

In the embodiment of the present invention, the linear driving assembly 24 includes a rack 27 and a power member 28 for driving the rack 27 to move linearly, the power gear set 25 includes a second gear 29 engaged with the rack 27 for transmission and a third gear 30 connected with the second gear 29, and the first gear 26 is engaged with the third gear 30 for transmission.

In the embodiment of the present invention, the power member 28 is a pneumatic cylinder or a hydraulic rod.

The utility model is further explained by combining the specific actions as follows:

when the die is closed, the power part 28 drives the rack 27 to do forward linear motion, the rack 27 drives the second gear 29 to rotate, the second gear 29 rotates to drive the third gear 30 to rotate, the third gear 30 rotates to drive the first gear 26 to rotate, the first gear 26 rotates to drive the screw core 7 to rotate, so that the screw core 7 enters the die cavity 35 from a position abutting against the first limiting groove 10 and abuts against the second limiting groove 11, and an internal thread structure of a product is formed through the first external thread part 13;

when the mold is opened, the rack 27 is driven by the power part 28 to do reverse linear motion, the rack 27 drives the second gear 29 to rotate, the second gear 29 rotates to drive the third gear 30 to rotate, the third gear 30 rotates to drive the first gear 26 to rotate, the first gear 26 rotates to drive the screw tooth mold core 7 to rotate, so that the screw tooth mold core 7 completes automatic internal thread removing motion and returns to a position abutting against the first limiting groove 10, at the moment, the screw tooth mold core 7 is separated from a product, and the product is ejected through the ejection mechanism 4, such as an ejector pin.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims (10)

1. An internal thread injection mold comprises an upper mold and a lower mold which are mutually butted, a glue feeding system arranged on the upper mold and an ejection mechanism arranged on the lower mold, wherein an upper mold core is fixedly arranged on the upper mold, a lower mold core is fixedly arranged on the lower mold, the upper mold core and the lower mold core are mutually covered to form a mold cavity for molding a product, the glue feeding system is butted and matched with the upper mold core, the ejection mechanism is butted and matched with the lower mold core, the internal thread injection mold is characterized in that,

be equipped with thread core and drive arrangement on going up the mould, thread core and die cavity butt joint cooperation, drive arrangement is used for driving thread core and carries out linear motion on last mould, make thread core butt joint in the die cavity or separate in the die cavity, screw has been seted up on the lateral wall of thread core, be used for the internal thread of shaping product, the cover is equipped with the axle sleeve on the thread core, be used for with thread core direction butt joint in the die cavity, axle sleeve fixed connection is on last mould, and the axle sleeve offsets with last mould benevolence, be equipped with the first spacing groove that corresponds to thread core on advancing gluey system, be equipped with on the lower mould benevolence and be used for with product joint complex runner, the edge of runner is equipped with a plurality of arc breachs along circumference, be equipped with the second spacing groove that corresponds to thread core on the center of runner, wherein, first spacing groove and second spacing groove all are used for restricting the displacement of thread core on last mould linear motion.

2. The internal thread injection mold according to claim 1, wherein the thread core comprises, in order from bottom to top, a receiving portion abutting on the second limiting groove, a first external thread portion for forming an internal thread of a product, an abutting portion abutting on the upper mold core, a bearing portion slidably engaged with the shaft sleeve, and a rotating shaft for power connection with the driving device, the upper end of the rotating shaft is provided with a second external thread portion, the second external thread portion is threadedly connected with the thread sleeve, the thread sleeve is fixedly connected to the upper mold, and the thread core is linearly moved on the upper mold by threaded connection of the rotating shaft and the thread sleeve.

3. The injection mold as claimed in claim 2, wherein the thread sleeve has an internal tooth channel in threaded connection with the second external thread portion, the glue feeding system includes a squirt nozzle, the first limit groove is provided on the squirt nozzle, and the first limit groove is located right above the internal tooth channel.

4. An internally threaded injection mold as claimed in claim 2, wherein the abutting portion includes a circular truncated portion connected to the receiving portion and a first annular portion connected to the bearing portion, wherein a cross section of the circular truncated portion gradually converges from an end of the circular truncated portion connected to the first annular portion to an end of the circular truncated portion connected to the receiving portion.

5. The injection mold with internal thread as claimed in claim 2, wherein the receiving portion comprises a receiving boss abutting against the second limiting groove and a second annular portion connected to the first external thread portion, wherein the second annular portion is in abutting fit with the rotation stop ring, and the cross section of the receiving boss gradually shrinks from the end of the receiving boss connected with the second annular portion to the end of the receiving boss far away from the second annular portion.

6. An internally threaded injection mold as claimed in claim 1 wherein the drive means comprises a rotary drive assembly for driving the threaded core into linear motion on the upper mold and a linear drive assembly for power connection to the rotary drive assembly.

7. The internal thread injection mold of claim 6, wherein the rotary driving assembly comprises a power gear set in power connection with the linear driving assembly and a first gear coaxially installed on the thread core, and the first gear is meshed with the power gear set for transmission.

8. An internally threaded injection mold according to claim 2 or 7, wherein the first gear is keyed to the shaft.

9. The injection mold as claimed in claim 7, wherein the linear driving assembly comprises a rack and a power member for driving the rack to move linearly, the power gear set comprises a second gear meshed with the rack for transmission and a third gear connected with the second gear, and the first gear is meshed with the third gear for transmission.

10. An internally threaded injection mold as claimed in claim 9, wherein the power member is a pneumatic cylinder or a hydraulic lever.

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