CN117359878A

CN117359878A - A thin-walled multi-cavity automatic demoulding hot runner mold

Info

Publication number: CN117359878A
Application number: CN202311487818.6A
Authority: CN
Inventors: 刘洋; 王全喜
Original assignee: Wuhan Liansu Precision Die Co ltd
Current assignee: Wuhan Liansu Precision Die Co ltd
Priority date: 2023-11-07
Filing date: 2023-11-07
Publication date: 2024-01-09

Abstract

The invention relates to the technical field of deep-cavity plastic molds, and in particular to a thin-walled multi-cavity automatic demoulding hot runner mold. The mold includes: a fixed mold assembly, which includes a fixed mold base, a hot runner plate, a fixed mold plate and a fixed mold core; a movable mold assembly, which includes a movable mold plate, a movable mold base and a movable mold core, and the movable mold assembly and the fixed mold core. Multiple mold cavities are formed between the mold components; multiple hot nozzles extend downward from the hot runner plate into the fixed mold plate, each hot nozzle corresponds to four cavities; the ejector pin is located on the movable mold base and the fixed mold plate between the hot runner plate and the hot nozzle; a hot runner manifold plate, which is located in the hot runner plate and connected to the hot nozzle; two insert plates, which are slidably installed between the fixed platen plate and the movable platen plate and are located on the two opposite sides of the movable platen plate ; Two pneumatic valves, which are located outside the movable template and are connected to the insert plate through the cylinder. The invention effectively solves the technical problems in the prior art that the deep cavity plastic mold has a small applicable range, cannot discharge the material head from the mold while demoulding, and cannot produce multiple products at the same time.

Description

Thin-wall multi-cavity automatic demoulding hot runner mould

Technical Field

The utility model relates to the technical field of deep cavity plastic molds, in particular to a thin-wall multi-cavity automatic demolding hot runner mold.

Background

The mould is a tool for manufacturing a formed product, and generally consists of a movable mould and a fixed mould, wherein the movable mould and the fixed mould can be separated and combined, a workpiece is taken out when the movable mould and the fixed mould are separated, and a blank is injected into a mould cavity for forming when the movable mould and the fixed mould are closed. At present, a deep cavity plastic mold is needed in the production process of plastic parts for deep cavity cosmetic box products, and a cold glue inlet is adopted in the use process of the traditional deep cavity plastic mold, so that the appearance of the product is not attractive, a large amount of water gap materials are produced, and the waste of raw materials is caused.

In order to solve the problems, the utility model patent document with the publication number of CN212124047U discloses a deep cavity plastic mold, wherein a top plate is arranged on the top of a cooling pipeline fixing plate, a needle valve hot runner pipe penetrates through the inner cavity of the top plate, raw materials are filled into the needle valve hot runner pipe when the mold is used, enter a needle tube through a feeding hole and then are extruded into the inner cavity of an upper mold base through the needle tube, and the mold cavity formed by the upper mold base, a lower mold base and a lower mold core is cooled and molded, so that the product is molded; meanwhile, circulating water pipes penetrate through the inner cavities of the side plates, the overturning plates and the cooling pipeline fixing plates, and the circulating water pipes are communicated with each other. The device is through setting up needle valve hot runner pipe for the surface of product is difficult for shrinking, and the vestige of runner is little, has guaranteed the aesthetic property of product appearance, and has reduced the production of mouth of a river material, has reduced the waste to the raw materials, through setting up circulating water pipe, makes the product be difficult for taking place to warp when injection moulding, has shortened the stable cycle of product shaping.

However, when the mold is used, the demolding of the product is realized through the ejector rod fixedly arranged at the top of the base plate and the ejector block fixedly arranged at the top of the ejector rod, and the ejector rod can only push the ejector block arranged at the top of the ejector rod to move upwards through the upward movement of the ejector rod, so that the injection molded product is ejected, and for the product with the bulge at the bottom, the upward-ejected demolding mode is extremely easy to damage the product, so that the application range of the mold is smaller; meanwhile, the die cannot separate the stub bar in the die from the die during demolding, measures are required to be taken to discharge the stub bar out of the die after the demolding of the product is completed, and the consumed time and cost are high; in addition, the mold cannot simultaneously produce a plurality of products, so that the production efficiency thereof is low.

Disclosure of Invention

The utility model provides a thin-wall multi-cavity automatic demolding hot runner mold, which aims to solve the technical problems that a deep cavity plastic mold in the prior art is small in application range, a stub bar cannot be discharged out of the mold while demolding is performed, and a plurality of products cannot be produced simultaneously.

In order to solve the problems, the thin-wall multi-cavity automatic demoulding hot runner mould provided by the utility model adopts the following technical scheme:

a thin-walled, multi-cavity, auto-demolding hot runner mold, comprising:

the fixed die assembly comprises a fixed die seat, a hot runner plate and a fixed die plate which are arranged from top to bottom, and a fixed die core is arranged in the fixed die plate;

the movable die assembly comprises a movable die plate and a movable die holder which are arranged from top to bottom, a movable die core is arranged in the movable die plate, and the movable die assembly and the fixed die assembly are matched up and down to form a plurality of cavities for injection molding;

the hot nozzles extend downwards from the hot runner plate into the fixed die plate, and each hot nozzle corresponds to four die cavities for injection molding into the die cavities;

further comprises:

the ejector rod is arranged between the movable die holder and the fixed die plate and is arranged corresponding to the hot nozzle, and the ejector rod is used for ejecting the movable die core upwards and ejecting a stub bar in the hot nozzle;

a hot runner manifold mounted within the hot runner manifold and connected to the hot nozzles for delivering plastic melt into the respective cavities;

the number of the plugboards is two, and the two plugboards are slidably arranged between the fixed die plate and the movable die plate and are positioned on two opposite sides of the movable die plate;

the number of the pneumatic control valves is two, the two pneumatic control valves are arranged on the outer side of the movable template and are connected with the plugboard through air cylinders, and the pneumatic control valves are used for controlling the ejection speed of the air cylinders so as to control the moving speed of the plugboard.

The thin-wall multi-cavity automatic demoulding hot runner mould provided by the utility model has the beneficial effects that: the ejector rod is arranged between the movable die holder and the fixed die plate and is arranged corresponding to the hot nozzle, so that the movable die core is ejected upwards during demolding, and meanwhile, a stub bar in the hot nozzle is ejected; the hot runner flow distribution plate is arranged in the hot runner plate and connected with the hot nozzle, so that plastic melt in the hot runner can be distributed through the hot runner flow distribution plate, and the distributed plastic melt is conveyed into each cavity through the hot nozzle connected with the hot runner flow distribution plate, and a plurality of products can be produced simultaneously by using the die; the two plugboards are arranged between the fixed die plate and the movable die plate, the two plugboards are arranged on two opposite sides of the movable die plate, two pneumatic control valves are arranged on the outer side of the movable die plate and are respectively connected with the two plugboards through air cylinders, when the die is opened, the fixed die plate and the movable die plate are separated, the air cylinders are controlled to eject through the pneumatic control valves to push the plugboards to enter the lower part of an ejected product, then, in the resetting process of the ejector rod, the product is pulled back onto the plugboards, and the product is separated from the movable die core to fall into a product recovery area through the reaction force between the end face of the product and the plugboards, so that the product can be demolded under the condition of not damaging the appearance of the product, and the die is wide in application range; meanwhile, the ejection speed of the air cylinder can be controlled by utilizing the pneumatic control valve, so that the moving speed of the inserting plate is controlled, and the situation that the inserting plate collides with a moving mold core and a product which are not completely ejected due to the fact that the moving speed of the inserting plate is too high is avoided. In summary, the utility model effectively solves the technical problems that the application range of the deep cavity plastic mold in the prior art is small, the material head cannot be discharged out of the mold while demolding is performed, and a plurality of products cannot be produced simultaneously.

Further, the picture peg includes the rectangular plate, and the orientation of rectangular plate one side of moving the mold core is provided with two parallel slide rails, and two slide rails are located the relative both sides of rectangular plate respectively, all slidable mounting has the slider on every slide rail.

Further, a plurality of U-shaped grooves are formed in the rectangular plate at intervals along the length direction of the rectangular plate, and the opening direction of the U-shaped grooves faces the movable mold core so as to ensure that the insert plate avoids the movable mold core when being inserted into the lower part of a product.

Further, the sliding rail is a miniature linear sliding rail, the sliding block is a miniature linear sliding block, and a force optimizing adhesive is arranged at one end, deviating from the rectangular plate, of the miniature linear sliding rail on the movable template so as to limit the moving distance of the miniature linear sliding block.

Further, the top of the ejector rod is provided with a cross rib so as to clamp the stub bar when the stub bar in the hot nozzle is ejected, and the stub bar is prevented from falling off in the ejection process.

Further, the hot runner manifold is provided with a plurality of runners, and the number of the runners is consistent with that of the mold cavities so as to convey plastic melt into each mold cavity.

Further, a fixed die insert is arranged in the fixed die plate, a movable die insert is arranged in the movable die plate, and the fixed die insert and the movable die insert are matched with the fixed die core and the movable die core so as to shape a product.

Further, a push rod base plate and a push rod fixing plate are sequentially arranged between the movable die holder and the movable die plate from bottom to top, and the push rod is fixedly arranged on the push rod fixing plate, penetrates through the push rod base plate upwards, the movable die plate and the movable die insert and extends to the hot nozzle.

Further, the outer surface of the movable mould assembly is provided with a mechanical valve and a mechanical valve collision block connected with the mechanical valve, the mechanical valve is further connected with the pneumatic control valve, and the mechanical valve collision block is used for touching the mechanical valve when the ejector rod fixing plate is ejected out so as to control the mechanical valve to be opened, thereby controlling the pneumatic control valve to be opened.

Further, the device comprises a strong pulling device, the strong pulling device comprises an auxiliary top strong pulling head which penetrates through the movable die holder and the ejector rod base plate and extends upwards to the bottom of the ejector rod fixing plate, and the strong pulling device is used for resetting the ejector rod fixing plate under the action of the injection molding machine.

Drawings

The above, as well as additional purposes, features, and advantages of exemplary embodiments of the present utility model will become readily apparent from the following detailed description when read in conjunction with the accompanying drawings. In the drawings, embodiments of the utility model are illustrated by way of example and not by way of limitation, and like reference numerals refer to similar or corresponding parts and in which:

FIG. 1 is a schematic diagram of a thin-wall multi-cavity automatic demolding hot runner mold provided by the utility model;

FIG. 2 is a schematic diagram II of a thin-wall multi-cavity automatic demolding hot runner mold provided by the utility model;

FIG. 3 is a schematic structural view of a fixed mold assembly of the thin-wall multi-cavity automatic demolding hot runner mold provided by the utility model;

FIG. 4 is a schematic diagram of a movable mold assembly of a thin-wall multi-cavity automatic demolding hot runner mold according to the present utility model;

FIG. 5 is a schematic diagram II of a movable mold assembly of the thin-wall multi-cavity automatic demolding hot runner mold provided by the utility model;

FIG. 6 is a schematic view of a fork and a rail of a thin-wall multi-cavity automatic demolding hot runner mold provided by the utility model;

fig. 7 is a schematic structural diagram of a mandrel of a thin-wall multi-cavity automatic demolding hot runner mold provided by the utility model.

Reference numerals illustrate:

1. a fixed die holder; 2. a hot runner plate; 3. a stationary mold plate; 4. a mold core is fixed; 5. a movable template; 6. a movable die holder; 7. a movable mold core; 8. a cavity; 9. a hot nozzle; 10. a push rod; 11. a hot runner manifold; 12. inserting plate; 13. a pneumatic control valve; 14. a cylinder; 15. a rectangular plate; 16. a miniature linear slide rail; 17. a miniature linear slider; 18. u-shaped groove I; 19. u-shaped grooves II; 20. a you li jiao (excellent force glue); 21. a heat insulating plate; 22. a fixed mold insert; 23. a movable mold insert; 24. a mandril backing plate; 25. a push rod fixing plate; 26. a mechanical valve; 27. a mechanical valve bump; 28. a strong pull head on the auxiliary top; 29. a hot runner junction box; 30. a push rod main body; 31. a mandril cross rib; 32. a plugboard limiting block; 33. a product; 34. a hexagon socket screw; 35. sizing block; 36. a muffler interface; 37. a micro-switch; 38. a micro-switch base; 39. and (5) carrying a copper pipe.

Detailed Description

The following description of the embodiments of the present utility model will be made more complete and clear to those skilled in the art by reference to the figures of the embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

The main conception of the thin-wall multi-cavity automatic demoulding hot runner mould provided by the utility model is that: the ejector rod corresponding to the hot nozzle is arranged between the movable die holder and the fixed die plate, so that the ejector rod is moved upwards during demolding, and the ejector rod is utilized to eject the movable die core and the stub bar in the hot nozzle simultaneously; the hot runner flow distribution plate is arranged in the hot runner plate, the hot runner flow distribution plate is connected with the hot nozzles, the hot runner flow distribution plate is used for distributing plastic melt in the hot runner, and then the hot nozzles connected with the hot runner flow distribution plate are used for conveying the distributed plastic melt to each cavity, so that the purpose of simultaneously producing a plurality of products by using the die is realized; through setting up two picture peg between fixed die plate and movable mould board, and arrange two picture peg at the both sides of movable mould board, and set up two pneumatic control valves in the outside of movable mould board, utilize the cylinder with two pneumatic control valves link to each other with two picture peg respectively, when the mould die sinking, pneumatic control valve control cylinder is ejecting to push away the push pedal to the below by the ejecting product of ejector pin, afterwards reset the ejector pin, at the in-process that the ejector pin reset, the product is pulled back to the picture peg, the reaction force between product terminal surface and the picture peg makes the product break away from movable mould core and drops to the product recovery district, thereby can make its drawing of patterns under the circumstances that does not destroy the appearance of product, both can be applicable to the drawing of patterns of the product of bottom regulation, can be applicable to the drawing of patterns of the product of bottom irregularity, its application scope is extensive. Through the arrangement, the deep cavity plastic mold disclosed by the utility model can effectively solve the technical problems that the application range of the deep cavity plastic mold in the prior art is small, the material head cannot be removed from the mold while demolding is performed, and a plurality of products cannot be produced simultaneously.

Having described the basic principles of the present utility model, various non-limiting embodiments of the utility model are described in detail below. Any number of elements in the figures are for illustration and not limitation, and any naming is used for distinction only and not for any limiting sense.

The principles and spirit of the present utility model are explained in detail below with reference to several representative embodiments thereof.

Example 1 of the thin-wall multi-cavity automatic demolding hot runner mold provided by the utility model:

as shown in fig. 1 and 2, the thin-wall multi-cavity automatic demolding hot runner mold comprises a fixed mold assembly, a movable mold assembly, a hot nozzle 9, an ejector rod 10, a hot runner plate 2, an inserting plate 12 and a pneumatic control valve 13.

With respect to the stationary mold assembly. As shown in fig. 1, 2 and 3, the fixed die assembly comprises a fixed die holder 1, a hot runner plate 2 and a fixed die plate 3 which are sequentially connected, a hot runner flow distribution plate 11 is arranged at the central part of the hot runner plate 2, six hot nozzles 9 which are used for injection molding and extend into the fixed die plate 1 are connected to the bottom of the hot runner flow distribution plate 11, a fixed die core 4 is arranged at the periphery of the hot nozzle 9 in the fixed die plate 3, and a fixed die insert 22 is further arranged between the fixed die plate 3 and the fixed die core 4 and between the fixed die core 4 and the hot nozzle 9. In addition, the outside of the fixed mold plate 3 is also provided with a hot runner junction box 29; the side of the fixed die holder 1 facing away from the hot runner plate 2 is provided with a heat insulating plate 21.

With respect to the movable mold assembly. As shown in fig. 1, 2, 4 and 5, the movable mold assembly comprises a movable mold base 6 and a movable mold plate 5 which are sequentially arranged from bottom to top, a movable mold insert 23 and a movable mold core 7 which are matched with a fixed mold insert 22 and a fixed mold core 4 up and down are arranged in the movable mold plate 5, a water carrying copper pipe 39 is arranged in the movable mold core 7, and twenty four cavities 8 for injection molding are formed in an area surrounded by the fixed mold core 4, the fixed mold insert 22, the movable mold core 7 and the movable mold insert 23. In particular, twenty-four runners are provided on the hot runner manifold 11 for delivering plastic melt into the respective mold cavities 8.

With respect to the jack 10. The number of the ejector rods 10 is six, as shown in fig. 7, each ejector rod 10 comprises an ejector rod main body 30, an ejector rod cross rib 31 is arranged at the top of the ejector rod main body 30, and the ejector rod cross rib 31 is used for clamping the stub bar when the stub bar in the hot nozzle 9 is ejected, so that the stub bar is prevented from falling in the ejection process. As shown in fig. 1 and 2, in the movable die assembly, a ram pad 24 and a ram fixing plate 25 are sequentially disposed between the movable die holder 6 and the movable die plate 5 from bottom to top, and a ram main body 30 is fixedly mounted on the ram fixing plate 25 and penetrates the ram pad 24, the movable die plate 5 and the movable die insert 23 upward and extends to the hot nozzle 9.

With respect to the board 12. The number of the plugboards 12 is two, as shown in fig. 6, each plugboard 12 comprises a rectangular plate 15, six U-shaped grooves 18 which are arranged at intervals along the length direction of the rectangular plate 15 and are outward opened and three U-shaped grooves 19 which are arranged at intervals along the length direction of the rectangular plate and are outward opened are formed in the rectangular plate 15, the size of each U-shaped groove 18 is larger than that of each U-shaped groove 19, the U-shaped grooves 18 and the U-shaped grooves 19 are arranged at intervals, a micro linear slide rail 16 which extends along the opening direction of each U-shaped groove is arranged on the left side and the right side of the rectangular plate 15, and a micro linear slide block 17 is slidably mounted on each micro linear slide rail 16.

As shown in fig. 1, 4 and 5, two insert plates 12 are slidably mounted between the fixed mold plate 3 and the movable mold plate 5 and are located at the left and right sides of the top surface of the movable mold plate 5, the opening direction of the U-shaped groove faces the movable mold core 7, the top surface of the movable mold plate 5 is provided with a force optimizing glue 20 at one end of the micro linear slide rail 16, which is far away from the rectangular plate 15, so as to limit the moving distance of the micro linear slide block 17, and insert plate limiting blocks 32 are respectively arranged at the left and right sides of the force optimizing glue 20 on the movable mold plate 5 so as to prevent the insert plates 12 from being blocked when ejecting a product 33.

With respect to the pneumatic valve 13. The number of the pneumatic control valves 13 is two, the two pneumatic control valves 13 are respectively positioned at the left side and the right side of the movable template 5, the two pneumatic control valves 13 are respectively connected with the two plugboards 12 through the air cylinders 14, and the pneumatic control valves 13 are used for controlling the ejection speed of the air cylinders 14 so as to control the moving speed of the plugboards 12. In addition, a group of mechanical valves 26 are respectively arranged at two opposite corners of the outer surface of the movable template 5, each mechanical valve 26 is connected with a mechanical valve bump block 27, the mechanical bump blocks 27 are positioned on the outer surface of the ejector rod fixing plate 25, each group of mechanical valves 26 is connected with one pneumatic control valve 13, and the mechanical valve bump blocks 27 are used for touching the mechanical valves 26 when the ejector rod fixing plate 25 is ejected out so as to control the mechanical valves 26 to be opened, and thus the pneumatic control valves 13 are controlled to be opened.

In addition, as shown in fig. 1 to 5, a strong pulling device comprising a secondary top strong pulling head 28 is further arranged on the movable die assembly, the secondary top strong pulling head 28 penetrates through the movable die holder 6 and the top plate backing plate 24 and extends upwards to the bottom of the ejector rod fixing plate 25, and is fixedly connected with the ejector rod fixing plate 25, the secondary top strong pulling head 28 is fixedly connected with the movable die holder 6 through an inner hexagonal set screw 34, and the strong pulling device is used for resetting the ejector rod fixing plate 25 under the action of an injection molding machine; a sizing block 35 is also arranged between the movable die holder 6 and the movable die plate 5; a muffler interface 36 is also provided on the pneumatic valve 13 to connect a muffler; the movable die holder 6 is also provided with a micro switch 37 and a micro switch base 38, wherein the micro switch 37 is used for confirming that the die can be closed after the ejector rod fixing plate 25 is completely returned, transmitting a signal to the injection molding machine and confirming that the injection molding machine is closed.

The working principle of the thin-wall multi-cavity automatic demoulding hot runner mould provided by the utility model is as follows: when injection molding is completed and the parting surfaces of the fixed die plate 3 and the movable die plate 5 are opened, the product 33 and the movable die core 7 are ejected to a preset position by the ejector rod 10, in the process that the product 33 is ejected, the material head in the hot nozzle 9 is ejected simultaneously, a mechanical valve bump block 27 on the ejector rod fixed plate 25 touches a mechanical valve 26 on the movable die plate 5, the mechanical valve 26 is communicated with the pneumatic control valve 13, the pneumatic control valve 13 enables the air cylinder 14 to push the inserting plate 12 to move forwards until reaching the stroke position of the inserting plate limiting block 32, a secondary top strong pull head 28 on the movable die holder 6 forcibly resets the ejector rod fixed plate 25 under the action of an injection molding machine, at the moment, the product 33 on the movable die core 7 contacts the inserting plate 12 in the pulling back process of the ejector rod fixed plate 25, the product 33 is demolded by the reaction force between the end surface of the product 33 and the inserting plate 12, the product 33 automatically drops to a product recovery area, the ejector rod fixed plate 25 continues to return to the original position, at the moment, the mechanical valve bump block 27 contacts the mechanical valve 26, signals are transmitted to the pneumatic control valve 13, and the pneumatic control valve 13 controls the air cylinder 14 to retract; when the ejector fixing plate 25 is completely returned, the microswitch 37 confirms that the mold can be closed, transmits a signal to the injection molding machine, confirms that the injection molding machine is closed, and then enters the next injection molding cycle.

Example 2 of the thin-wall multi-cavity automatic demolding hot runner mold provided by the utility model:

the differences from example 1 are mainly that:

in embodiment 1, the number of the hot nozzles is six, the number of the mold cavities is twenty-four, and each hot nozzle corresponds to four mold cavities.

In this embodiment, the number of the hot nozzles and the mold cavities is determined according to specific use conditions, and each hot nozzle corresponds to four mold cavities.

Example 3 of the thin-wall multi-cavity automatic demolding hot runner mold provided by the utility model:

the differences from example 1 are mainly that:

in the embodiment 1, six U-shaped grooves I and three U-shaped grooves II are formed in the rectangular plate.

In this embodiment, the number of the first and second U-shaped grooves on the rectangular plate is determined according to the specific use condition.

It will be further understood by those skilled in the art from the foregoing description of the present specification that terms such as "upper", "lower", "front", "left", "right", "length", "top", "bottom", "inner", "outer", and the like, which indicate an azimuth or a positional relationship, are based on the azimuth or the positional relationship shown in the drawings of the present specification, are for convenience of explanation of aspects of the present utility model and for simplicity of description only, and do not explicitly show or imply that the devices or elements involved must have the specific azimuth, be constructed and operated in the specific azimuth, and thus the azimuth or positional relationship terms described above should not be construed or construed as limitations of aspects of the present utility model.

In addition, in the description of the present specification, the meaning of "plurality" means at least two, for example, two, three or more, etc., unless specifically defined otherwise.

Claims

1. A thin-walled, multi-cavity, auto-demolding hot runner mold, comprising:

characterized by further comprising:

2. The thin-wall multi-cavity automatic demolding hot runner mold as claimed in claim 1, wherein the inserting plate comprises a rectangular plate, two parallel sliding rails are arranged on one side of the rectangular plate facing the movable mold core, the two sliding rails are respectively positioned on two opposite sides of the rectangular plate, and a sliding block is slidably arranged on each sliding rail.

3. The thin-wall multi-cavity automatic demolding hot runner mold as claimed in claim 2, wherein a plurality of U-shaped grooves are formed in the rectangular plate at intervals along the length direction of the rectangular plate, and the opening direction of the U-shaped grooves faces the movable mold core so as to ensure that the insert plate avoids the movable mold core when being inserted under a product.

4. The thin-wall multi-cavity automatic demolding hot runner mold according to claim 2 or 3, wherein the sliding rail is a miniature linear sliding rail, the sliding block is a miniature linear sliding block, and a force optimizing adhesive is arranged on one end, away from the rectangular plate, of the miniature linear sliding rail on the movable mold plate so as to limit the moving distance of the miniature linear sliding block.

5. A thin-walled multichamber automatic demolding hot runner mold as in any of claims 1 to 3 wherein the top of the ejector pin has a cross rib to catch the stub bar as it is ejected from the hot nozzle, avoiding the stub bar from falling during ejection.

6. A thin-walled multichamber automatic demolding hot runner mold as in any of claims 1 to 3 wherein a plurality of runners are provided on the hot runner manifold, the number of runners being consistent with the number of cavities for delivering plastic melt into each cavity.

7. A thin-walled multichambered automatic demolding hot runner mold as in any of claims 1 to 3, wherein a stationary mold insert is provided in the stationary mold plate, a movable mold insert is provided in the movable mold plate, and the stationary mold insert and the movable mold insert cooperate with the stationary mold core and the movable mold core to mold the product.

8. The thin-wall multi-cavity automatic demolding hot runner mold according to claim 7, wherein a push rod base plate and a push rod fixing plate are sequentially arranged between the movable mold base and the movable mold plate from bottom to top, and the push rod is fixedly arranged on the push rod fixing plate, penetrates through the push rod base plate, the movable mold plate and the movable mold insert upwards and extends to the hot nozzle.

9. A thin-wall multi-cavity automatic demolding hot runner mold as claimed in any one of claims 1 to 3, wherein the outer surface of the movable mold assembly is provided with a mechanical valve and a mechanical valve bump block connected with the mechanical valve, the mechanical valve is also connected with the pneumatic control valve, and the mechanical valve bump block is used for touching the mechanical valve when the ejector rod fixing plate is ejected out so as to control the mechanical valve to be opened, thereby controlling the pneumatic control valve to be opened.

10. A thin-wall multi-cavity automatic demolding hot runner mold as claimed in any one of claims 1 to 3, further comprising a strong pulling device comprising a secondary top strong pull head penetrating through the movable mold base and the ejector pad plate and extending up to the bottom of the ejector fixing plate, the strong pulling device being used for resetting the ejector fixing plate under the action of an injection molding machine.