Mould with helical gear demoulding structure

Abstract

The utility model discloses a mould with a helical gear demoulding structure, which comprises a mould frame, a mould core, an ejection mechanism and a core pulling mechanism, the ejection mechanism comprises an ejection plate group and an ejector pin, and the core pulling mechanism comprises a gear driving rod, a gear and a helical gear insert; the gear driving rod is fixedly connected with the ejector plate group, the gear is in sliding connection with the gear driving rod, the helical tooth insert is meshed with the gear, and a product is meshed with the helical tooth insert; the ejector plate set drives the gear driving rod and the ejector pin to move in the mold opening direction, the gear driving rod drives the gear to axially rotate, the gear drives the helical tooth insert to axially rotate, and the helical tooth insert drives the product to move in a core pulling mode in the mold opening direction; meanwhile, the ejector pin ejects the product out, so that core pulling and ejection are completed at the same time; according to the core pulling mechanism, the core pulling action and the ejection action are synchronously completed, and the load force borne by the ejector pin and the helical tooth insert in the ejection process is greatly reduced.

Description

Technical Field

[0001] The utility model relates to the field of molds, in particular to a mold with a helical gear demoulding structure. Background Art

[0002] The Chinese published patent application publication number is: CN202480344U, which discloses a secondary ejection mechanism of a helical gear forming mold and a helical gear forming mold, including a lower fixed plate, a movable plate, a straight tooth forming insert, a push plate for performing a first ejection action, a helical tooth forming insert connected to the push plate, an ejector plate arranged on the lower fixed plate, and a sleeve assembly for performing a second ejection action, and a travel space for the ejector plate to move is provided between the movable plate and the lower fixed plate; first, the movable mold is separated from the fixed mold, and the lower fixed plate drives the movable plate and the straight tooth forming insert to move, the push plate and the helical tooth forming insert connected to the push plate and the molded product do not move with them, and the straight tooth forming insert is separated from the straight tooth part of the molded product to realize the first ejection action; the ejector plate drives the sleeve assembly to perform a second ejection action to eject the product, because the sleeve assembly is a cylindrical part that pushes while driving the product to rotate with the helical tooth forming part of the helical tooth forming insert to eject the helical gear product, thereby avoiding direct ejection with only vertical force to damage the helical gear.

[0003] However, with the above solution, the ejector pin drives the bevel tooth insert during product ejection. During the ejection process, the ejector pin and the bevel tooth insert are under great load. Moreover, when the mold is reset, the movable mold and the bevel tooth insert need to be inserted and returned to their original position, which can easily cause damage to parts and reduce the service life of the equipment. In addition, because the product and the bevel tooth molding insert are often in a locked state during the secondary ejection process, the product cannot be smoothly rotated and ejected from the bevel tooth molding part of the bevel tooth molding insert, resulting in poor ejection or even jamming, which in turn causes product damage and delays in production progress. Utility Model Content

[0004] In order to solve the technical problems existing in the prior art, the purpose of the utility model is to provide a mold with a helical gear demoulding structure.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A mold with a helical gear demoulding structure comprises a mold frame, a mold core, an ejection mechanism and a core pulling mechanism, wherein the mold core and the ejection mechanism are respectively assembled in the mold frame, the core pulling mechanism is assembled in the mold core, the ejection mechanism comprises an ejector plate assembly and an ejector pin, the ejector pin is fixedly connected to the ejector plate assembly, and the core pulling mechanism comprises a gear driving rod, a gear and a helical gear insert, wherein:

[0007] The gear drive rod is fixedly connected to the ejector plate assembly, the gear is slidably connected to the gear drive rod, the helical tooth insert is meshed with the gear, and the product is meshed with the helical tooth insert;

[0008] The ejector plate assembly drives the gear drive rod and the ejector pin to move in the mold opening direction, the gear drive rod drives the gear to rotate axially, the gear drives the helical tooth insert to rotate axially, and the helical tooth insert drives the product to move in the mold opening direction by core pulling; at the same time, the ejector pin ejects the product, thereby completing core pulling and ejection at the same time.

[0009] Further preferably, the gear driving rod comprises a first driving rod guide groove and a second driving rod guide groove, and the first driving rod guide groove is connected to the second driving rod guide groove.

[0010] Further preferably, the second driving rod guide groove is provided on the outer surface of the gear driving rod;

[0011] The second driving rod guide groove is arranged along the axial direction of the gear driving rod.

[0012] Further preferably, the first driving rod guide groove is spirally formed on the outer surface of the gear driving rod and extends toward a side edge of the gear driving rod close to the gear.

[0013] Further preferably, the axial displacement stroke of the spiral first driving rod guide groove on the outer surface of the gear driving rod is the same as the core-pulling displacement stroke of the product along the mold opening direction.

[0014] Further preferably, the gear includes a rotating part and a gear guide protrusion, the rotating part is a circular ring gear, and the gear guide protrusion is evenly and symmetrically distributed on the inner wall on both sides of the axis of the circular ring gear along the mold opening direction.

[0015] Further preferably, the gear guide protrusion is a spherical protrusion.

[0016] Further preferably, the helical tooth insert comprises a semicircular annular three-dimensional structure and inner teeth, the inner teeth are arranged on the inner wall of the semicircular annular three-dimensional structure, and the inner teeth are meshed with the product.

[0017] Further preferably, the inner teeth are helical teeth.

[0018] After adopting the above technical solution, the utility model has the following advantages compared with the background technology:

[0019] This technical solution sets up a core-pulling mechanism, which uses an ejector plate group to drive the gear drive rod and the ejector pin to eject synchronously. The guide groove on the gear drive rod drives the gear to rotate, and the gear drives the helical tooth insert to rotate. The helical tooth insert drives the product away from the rear mold core along the mold opening direction to perform core pulling displacement and ejection displacement, thereby completing demolding.

[0020] 1. The core pulling mechanism has a simple structure and does not require a large amount of space inside the mold, making it easy to install and maintain.

[0021] 2. This core-pulling mechanism completes the core-pulling action and ejection action simultaneously, greatly reducing the load force on the ejector pin and the helical tooth insert during the ejection process, effectively reducing the loss rate of parts and extending the service life of the equipment; and effectively avoiding the occurrence of problems such as the product being unable to smoothly rotate relative to the helical tooth insert during the ejection process due to the product being locked.

[0022] 3. Because the gears and helical tooth inserts do not need to be ejected during the ejection process, the mold does not need to be inserted and returned to its original position when it is reset, which reduces the damage rate of the parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a three-dimensional structural diagram of a mold with a helical gear demoulding structure;

[0024] Figure 2 yes Figure 1 The structure shown in is a cross-sectional view along AA;

[0025] Figure 3 yes Figure 2 A local enlarged view of point a in the middle;

[0026] Figure 4 yes Figure 1 The structure shown in is a cross-section along BB;

[0027] Figure 5 yes Figure 1 The structure shown in is a cross-section along CC;

[0028] Figure 6 It is a schematic diagram of the three-dimensional structure of the gear in the embodiment of the present utility model;

[0029] Figure 7 This is a schematic diagram of the three-dimensional structure of the gear drive rod in the embodiment of the present utility model;

[0030] Figure 8 It is a schematic diagram of the three-dimensional structure of the helical tooth insert described in the embodiment of the present utility model;

[0031] Figure 9 It is a schematic diagram of the three-dimensional structure of the product described in the embodiment of the utility model.

[0032] The symbols of the drawings in the above description are as follows:

[0033] 110, top plate; 120, front template;

[0034] 210, rear template; 220, square iron; 230, bottom plate; 240, ejector plate assembly; 250, ejector pin;

[0035] 310, front mold core; 320, rear mold core;

[0036] 410, gear pressing block; 420, gear; 421, gear guide protrusion; 430, gear drive rod; 431, first drive rod guide groove; 432, second drive rod guide groove; 440, gear tray; 450, helical tooth insert; 451, external tooth; 452, internal tooth; 453, guide through hole; 454, limiting protrusion; 460, guide rod; 470, columnar insert;

[0037] 500. Products. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0039] It should be noted that in the present invention, the terms "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. are all based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element of the present invention must have a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0040] Example

[0041] like Figures 1 to 2 As shown, the utility model discloses a mold with a helical gear demoulding structure, which includes a mold frame, a mold core, an ejection mechanism and a core pulling mechanism.

[0042] like Figures 1 to 2 As shown, the mold frame includes a front mold group and a rear mold group, the front mold group includes a top plate 110 and a front template 120; the top plate 110 is fixedly connected to the front template 120, and the front template 120 is in contact with the rear mold group; the front template 120 is provided with a front template accommodating groove, and the front template accommodating groove is an accommodating cavity, and the opening direction of the accommodating cavity is toward the rear mold group; the top plate 110 and the front template 120 are driven to perform mold opening displacement along the mold opening direction away from the rear mold group to complete the mold opening movement.

[0043] like Figures 1 to 2 As shown, the rear module includes a base plate 230, a square iron 220 and a rear template 210; the two square irons 220 are symmetrically fixed on the base plate 230, and the rear template 210 is fixed on the two square irons 220, so that there is a certain space between the base plate 230 and the rear template 210; the rear template 210 is provided with a rear template 210 limiting groove, and the rear template 210 limiting groove is a receiving cavity, and the opening direction of the receiving cavity is toward the front module.

[0044] like Figure 2 As shown, the ejection mechanism includes an ejector plate group 240 and an ejector pin 250. The ejector plate group 240 is assembled in the space formed by the base plate 230 and the rear template 210. One end of the ejector pin 250 is fixed to the ejector plate group 240, and the other end passes through the rear template 210, extends toward the front template, and contacts the injection molded product 500. When the ejector plate group 240 is driven and displaced along the mold opening direction toward the front template, the ejector plate group 240 drives the ejector pin 250 to perform ejection displacement along the mold opening direction toward the front template, thereby ejecting the product 500.

[0045] like Figures 2 to 3 As shown, the mold core includes a front mold core 310 and a rear mold core 320; the front mold core 310 is fixed in the front mold plate accommodating groove, and the open end of the front mold core 310 faces the rear mold group; the rear mold core 320 is fixed in the rear mold plate limiting groove, and the open end of the rear mold core 320 faces the front mold group; the front mold core 310 and the rear mold core 320 are interlocked to form a molding cavity that is adapted to the shape of the required injection molded product 500; the molding cavity includes a gear fixing cavity, a helical gear insert fixing cavity and a product molding cavity, the gear fixing cavity is adjacent to and communicated with the helical gear insert fixing cavity and is arranged between the front mold core 310 and the rear mold core 320, and the helical gear insert fixing cavity is adjacent to and communicated with the product molding cavity and is arranged between the front mold core 310 and the rear mold core 320.

[0046] like Figures 2 to 3 As shown, the front mold core 310 includes a front gear fixing groove, a front product molding groove and a columnar insert 470; the opening directions of the front gear fixing groove and the front product molding groove are both toward the rear mold group; one end of the columnar insert 470 is fixedly connected to the front mold core 310, and the other end of the columnar insert 470 passes through the front mold core 310 and extends toward the rear mold group. The columnar insert 470 extends into the product molding cavity and contacts the ejector pin 250.

[0047] like Figures 2 to 3As shown, the rear mold core 320 includes a rear gear fixing groove, a helical gear insert fixing groove and a rear product forming groove; the opening directions of the rear gear fixing groove, the helical gear insert fixing groove and the rear product forming groove are all toward the front mold group; the rear gear fixing groove is adjacent to and connected to the helical gear insert fixing groove and is opened on the rear mold core 320, and the helical gear insert fixing groove and the rear product forming groove are adjacent to and connected; a helical gear insert limiting groove is also opened at the bottom of the helical gear insert fixing groove, and the opening direction of the helical gear insert limiting groove is toward the front mold group; The open end of the front gear fixing groove contacts the open end of the rear gear fixing groove to form a gear fixing cavity; the open end of the helical gear insert fixing groove contacts the front mold core 310 and forms a helical gear insert fixing cavity together with the front mold core 310; the front product molding groove and the rear product molding groove are buckled and connected, and the front product molding groove, the rear product molding groove, the core pulling mechanism, and the columnar insert 470 together form a product molding cavity; the gear fixing cavity, the helical gear insert fixing cavity and the product molding cavity together form the molding cavity.

[0048] like Figures 2 to 5 As shown, the core-pulling mechanism includes a driving part and a helical tooth insert 450. The driving part is assembled in the gear fixing cavity, and the helical tooth insert 450 is assembled in the helical tooth insert fixing cavity. The driving part is engaged with the helical tooth insert 450; the helical tooth insert 450 is engaged with the product 500 in the product molding cavity.

[0049] like Figures 3 to 5 As shown, the driving part includes a gear pressing block 410, a gear 420, a gear tray 440 and a gear driving rod 430. The gear tray 440 is assembled in the rear gear fixing groove, and the gear 420 is assembled on the gear tray 440. The gear 420 is in conflict with the gear tray 440. The gear pressing block 410 is assembled in the gear fixing cavity and is fixedly connected to the rear mold core 320. One end of the gear driving rod 430 is fixedly connected to the ejector plate assembly 240, and the other end of the gear driving rod 430 passes through the rear mold plate 210, the rear mold core 320, and the gear fixing cavity in sequence along the mold opening direction, and is slidably connected to the gear 420.

[0050] Specific: such as Figures 3 to 5 As shown, the gear pressing block 410 includes a gear pressing block limiting groove and a gear driving rod clearance hole. The gear pressing block limiting groove is opened along the mold opening direction and is arranged on the outer surface of the gear pressing block 410 facing the rear module. The opening direction of the gear pressing block limiting groove is toward the rear module; the gear driving rod clearance hole passes through the gear pressing block limiting groove along the mold opening direction.

[0051] like Figure 6As shown, the gear 420 includes a rotating part and a limiting part, the rotating part and the limiting part are fixedly connected and are integrally injection molded; the rotating part is a circular ring gear, the circular ring gear includes a plurality of gear teeth, a plurality of the gear teeth are vertically arranged on the outer wall of the circular ring gear, and a plurality of the gear teeth are engaged with the helical tooth insert 450; the gear 420 also includes a gear guide protrusion 421, the gear guide protrusion 421 is evenly and symmetrically distributed on the inner wall of the circular ring gear along the mold opening direction; the limiting The positioning portion is a circular ring structure, which is fixedly linked to the circular ring gear and axially connected along the mold opening direction. The inner diameter of the circular ring protrusion is the same as the inner diameter of the circular ring gear, and the outer diameter of the circular ring protrusion is smaller than the outer diameter of the circular ring gear. The limiting portion extends into the limiting groove of the gear pressing block along the mold opening direction, so that the gear 420 is restricted in the gear fixing cavity by the gear pressing block 410, thereby limiting the displacement of the gear 420 in the gear fixing cavity along the mold opening direction.

[0052] It is worth noting that: the gear 420 is connected to the gear drive rod clearance hole;

[0053] Preferably, the gear guide protrusion 421 is a spherical protrusion; in the present utility model, the number of the spherical protrusions is four, and the four spherical protrusions are evenly and symmetrically distributed on the inner wall of the annular gear along the mold opening direction.

[0054] like Figure 7 As shown, the gear drive rod 430 is a columnar rod, one end of which is fixedly connected to the ejector plate assembly 240, and the other end of which passes through the rear mold plate 210, the rear mold core 320, and the gear fixing cavity in sequence along the mold opening direction, extends into the interior of the gear 420, and is slidably connected to the gear 420; the gear drive rod 430 includes a drive rod guide groove, which is provided on the outer surface of the gear drive rod 430 on the side close to the gear 420, and the opening direction of the drive rod guide groove faces the inner wall of the gear 420;

[0055] The driving rod guide groove includes a first driving rod guide groove 431 and a second driving rod guide groove 432, wherein the first driving rod guide groove 431 and the second driving rod guide groove are connected to each other; the second driving rod guide groove 432 is vertically opened on the outer surface of the gear driving rod 430, and the opening direction of the second driving rod guide groove 432 faces the inner wall of the gear 420; the second driving rod guide groove 432 is arranged on the outer surface of the gear driving rod 430 along the axial direction of the gear driving rod 430;

[0056] One end of the first driving rod guide groove 431 is connected to the second driving rod guide groove 432, and the other end of the first driving rod guide groove 431 extends along the outer surface of the gear driving rod 430 in a spiral shape toward the side edge of the gear driving rod 430 close to the gear 420, and the opening direction of the first driving rod guide groove 431 faces the inner wall of the gear 420. More specifically, the first driving rod guide groove 431 is spirally arranged on the outer surface of the gear driving rod 430 and extends from the side where the first driving rod guide groove 431 and the second driving rod guide groove 432 are connected toward the side edge of the gear driving rod 430 close to the gear 420.

[0057] The axial displacement stroke of the spiral first driving rod guide groove 431 on the outer surface of the gear driving rod 430 is the same as the core-pulling displacement stroke of the product 500 along the mold opening direction;

[0058] Preferably, the driving rod guide groove is semicircular along the cross section of the columnar rod. In the present invention, there are four driving rod guide grooves, which are evenly and symmetrically distributed on the outer surface of the gear driving rod 430 along the axial direction of the gear driving rod 430. The driving rod guide groove is adapted to the gear guide protrusion 421, so that the gear guide protrusion 421 can generate a sliding displacement in the driving rod guide groove relative to the driving rod guide groove, thereby making the gear driving rod 430 slidably connected to the gear 420.

[0059] When the gear driving rod 430 is driven, the gear driving rod 430 is ejected along the mold opening direction toward the front mold group; the gear guide protrusion 421 is in the first driving rod guide groove 431, and slides relative to the first driving rod guide groove 431 toward the second driving rod guide groove 432, so that the gear guide protrusion 421 drives the gear 420 to rotate in the gear pressing block limiting groove with the axis of the gear 420 as the center of the circle; when the gear guide protrusion 421 is relatively displaced to the second driving rod guide groove 432, the rotation of the gear 420 ends.

[0060] like Figure 5 and Figure 8 As shown, the helical tooth insert 450 includes a semicircular three-dimensional structure, a limiting protrusion 454, an outer tooth 451, an inner tooth 452, a guide through hole 453 and a guide rod 460;

[0061] The limiting protrusion 454 is arranged below the semicircular ring-shaped three-dimensional structure along the mold opening direction and is fixedly connected to the semicircular ring-shaped three-dimensional structure. The limiting protrusion 454 and the semicircular ring-shaped three-dimensional structure are integrally injection-molded. The limiting protrusion 454 extends into the limiting groove of the bevel tooth insert away from the side of the semicircular ring-shaped three-dimensional structure, so that the bevel tooth insert 450 rotates in the limiting groove with the center of the semicircular ring-shaped three-dimensional structure as the center.

[0062] There are a plurality of external teeth 451 , which are vertically arranged on the outer wall of the semicircular ring-shaped three-dimensional structure, and mesh with the plurality of gear teeth of the gear 420 ;

[0063] There are a plurality of inner teeth 452 , which are disposed on the inner wall of the semicircular annular three-dimensional structure. The inner teeth 452 are meshed with the product 500 . The product 500 includes a helical tooth portion, and the inner teeth 452 are meshed with the helical tooth portion. The inner teeth 452 are helical teeth, which are adapted to the helical tooth portion of the product 500 .

[0064] The guide through hole 453 passes through the semicircular ring-shaped three-dimensional structure along the mold opening direction. There are two guide through holes 453, and the two guide through holes 453 are symmetrically distributed on both sides of the axis of the semicircular ring-shaped three-dimensional structure. There are two guide rods 460, and the two guide rods 460 pass through the two guide through holes 453 respectively, and the two guide rods 460 are fixedly connected to the rear mold core 320 respectively, so that the relative displacement of the two guide rods 460 relative to the two guide through holes 453 is limited within the two guide through holes 453, thereby limiting the rotational displacement of the bevel tooth insert 450 in the bevel tooth insert limiting groove with the center of the semicircular ring-shaped three-dimensional structure as the center.

[0065] In summary, the working principle of core pulling of a mold with a helical gear demoulding structure is as follows:

[0066] like Figures 2 to 5As shown, in the mold opening state, the front mold core 310 drives the columnar insert 470 to move along the mold opening direction away from the rear mold group until the columnar insert 470 is completely separated from the product 500; the ejector plate assembly 240 is driven to drive the ejector pin 250 and the gear drive rod 430 to perform ejection displacement along the mold opening direction toward the front mold group, and the gear drive rod 430 drives the gear guide protrusion 421 in the drive rod guide groove to move from the first drive rod guide groove 431 to the second drive rod guide groove 432, and the gear guide protrusion 421 drives the gear 420 to rotate in the gear pressing block limiting groove with the axis of the gear 420 as the center of the circle; the gear 420 drives the helical gear insert 450, so that the helical gear insert 450 rotates in the helical gear insert limiting groove with the center of the semicircular ring-shaped three-dimensional structure as the center of the circle; the helical gear insert 450 drives the product 500 along the mold opening direction. The core-pulling displacement is performed toward the front mold group; at the same time, the ejector pin 250 is ejected toward the front mold group, driving the product 500 to be ejected along the mold opening direction toward the front mold group; when the gear guide protrusion 421 is displaced from the first drive rod guide groove 431 to the second drive rod guide groove 432, the rotational displacement of the gear 420 in the gear pressing block limiting groove is completed; at the same time, the two guide rods 460 are in the two guide through holes 453, and the relative displacement generated relative to the two guide through holes 453 is restricted, so that the rotational displacement of the helical tooth insert 450 in the helical tooth insert limiting groove is completed, thereby completing the core-pulling displacement of the product 500 along the mold opening direction toward the front mold group; the ejector pin 250 continues to be ejected toward the front mold group, driving the product 500 to be ejected along the mold opening direction toward the front mold group until the product 500 is completely ejected from the mold.

[0067] like Figure 1-9 As shown, the demoulding steps of the product of the mold with the helical gear demoulding structure are as follows:

[0068] Step 1: Open the mold:

[0069] When the mold completes injection molding and needs to be opened, the front mold assembly is driven to move in the direction away from the rear mold plate 210 to perform mold opening displacement; specifically: the top plate 110 is driven to drive the front mold plate 120 and the front mold core 310 away from the rear mold plate 210 and move in the mold opening direction, and the front mold core 310 drives the columnar insert 470 away from the rear mold plate 210 and moves in the mold opening direction.

[0070] Step 2: Core pulling and ejection:

[0071] The ejector plate assembly 240 is driven, and the ejector plate drives the ejector pin 250 and the gear drive rod 430 to perform an ejection displacement along the mold opening direction toward the front mold assembly; the gear drive rod 430 drives the gear guide protrusion 421 to move from the first drive rod guide groove 431 to the second drive rod guide groove 432 in the drive rod guide groove, and the gear guide protrusion 421 drives the gear 420 to rotate in the gear pressure block limiting groove with the axis of the gear 420 as the center; the gear 420 drives the helical gear insert 450, so that the helical gear insert 450 rotates in the helical gear insert limiting groove with the center of the semicircular ring-shaped three-dimensional structure as the center; the helical gear insert 450 drives the product 500 to perform a core-pulling displacement along the mold opening direction toward the front mold assembly; at the same time, the ejector pin 250 performs an ejection displacement toward the front mold assembly, thereby completely ejecting the product 500, thereby completing the core-pulling and ejection work.

[0072] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A mold with a helical gear demolding structure, comprising a mold frame, a mold core, an ejector mechanism, and a core-pulling mechanism, wherein the mold core and the ejector mechanism are respectively assembled in the mold frame, the core-pulling mechanism is assembled in the mold core, the ejector mechanism comprises an ejector plate assembly and an ejector pin, the ejector pin is fixedly connected to the ejector plate assembly, and is characterized in that: The core pulling mechanism includes a gear driving rod, a gear and a helical tooth insert, wherein: The gear drive rod is fixedly connected to the ejector plate assembly, the gear is slidably connected to the gear drive rod, the helical tooth insert is meshed with the gear, and the product is meshed with the helical tooth insert; The ejector plate assembly drives the gear drive rod and the ejector pin to move in the mold opening direction, the gear drive rod drives the gear to rotate axially, the gear drives the helical tooth insert to rotate axially, and the helical tooth insert drives the product to move in the mold opening direction by core pulling; at the same time, the ejector pin ejects the product, thereby completing core pulling and ejection at the same time.

2. The mold with a helical gear demoulding structure according to claim 1, characterized in that: The gear driving rod includes a first driving rod guide groove and a second driving rod guide groove, and the first driving rod guide groove is connected to the second driving rod guide groove.

3. The mold with a helical gear demoulding structure according to claim 2, characterized in that: The second driving rod guide groove is provided on the outer surface of the gear driving rod; The second driving rod guide groove is arranged along the axial direction of the gear driving rod.

4. The mold with a helical gear demoulding structure according to claim 3, characterized in that: The first driving rod guide groove is spirally formed on the outer surface of the gear driving rod and extends toward a side edge of the gear driving rod close to the gear.

5. The mold with a helical gear demoulding structure according to claim 4, characterized in that: The axial displacement stroke of the spiral first driving rod guide groove on the outer surface of the gear driving rod is the same as the core-pulling displacement stroke of the product along the mold opening direction.

6. The mold with a helical gear demoulding structure according to claim 1, characterized in that: The gear includes a rotating part and a gear guide protrusion, the rotating part is a circular ring gear, and the gear guide protrusions are evenly and symmetrically distributed on the inner walls on both sides of the axis of the circular ring gear along the mold opening direction.

7. The mold with a helical gear demoulding structure according to claim 6, characterized in that: The gear guide protrusion is a spherical protrusion.

8. The mold with a helical gear demoulding structure according to claim 1, characterized in that: The helical tooth insert comprises a semicircular annular three-dimensional structure and inner teeth, wherein the inner teeth are arranged on the inner wall of the semicircular annular three-dimensional structure, and the inner teeth are meshed with the product.

9. The mold with a helical gear demoulding structure according to claim 8, characterized in that: The inner teeth are helical teeth.

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