Inverted injection molding demolding device for PPR (Polypropylene Random) gap bridge elbow

Abstract

The utility model relates to an upside-down injection molding demoulding device for a PPR (pentatricopeptide repeats) gap bridge elbow, and belongs to the technical field of PPR gap bridge pipeline injection molding processing. The mold comprises a movable mold set, a fixed mold set, a first mold core, a second mold core, a first core pulling assembly and a second core pulling assembly, the movable mold set is provided with a first mold cavity, the fixed mold set is provided with a second mold cavity, and the first mold cavity and the second mold cavity are oppositely arranged to form a mold mold cavity for forming the external shape of the gap bridge elbow. The two ends, corresponding to the two outlets of the gap bridge elbow, in the mold cavity are defined as the left end and the right end of the mold cavity; the first mold core and the second mold core are respectively inserted into the mold cavity from the left side and the right side of the mold cavity, the first mold core and the second mold core are spliced into a mold core matched with the shape of an inner cavity of the gap bridge elbow, and an injection molding cavity is formed between the outer side wall of the mold core and the inner side wall of the mold cavity; the first core pulling assembly and the second core pulling assembly are connected with the first mold core and the second mold core correspondingly and used for pulling the first mold core and the second mold core to be away from each other.

Description

TECHNICAL FIELD

[0001] The utility model relates to PPR overbridge pipeline injection moulding processing technical field especially relates to a kind of PPR overbridge elbow pipe flip-chip injection moulding demolding device. BACKGROUND

[0002] PPR overbridge elbow pipe is a kind of plastic elbow pipe commonly used in house decoration engineering, generally using injection mould to be injection moulded, after injection moulding, the smooth demolding of core in overbridge elbow pipe is the key to product development success. Since overbridge elbow pipe has certain slope, the traditional demolding mode, usually make core into subassembly and be sequentially extracted by slanting and straight pulling, such as the demolding structure of large overbridge elbow pipe piece mould slanting and straight pulling type disclosed in the patent with the announcement number CN109702969B, the patent includes flat flared bush, elbow core rod, fixed mould bush, movable mould bush, the above-mentioned flat flared bush, elbow core rod, fixed mould bush, movable mould bush jointly enclose the pouring cavity of overbridge elbow pipe, after injection moulding, first make fixed mould bush and fixed mould bush separate, then extract elbow core rod, then extract flat flared bush, complete demolding. But in the patent, since core is divided into elbow core rod and flat flared bush, when demolding, elbow core rod and flat flared bush need to be sequentially extracted respectively, and the demolding process is relatively complex, and a series of structures need to be set to drive elbow core rod and flat flared bush to be extracted outward, so that the structure of equipment is relatively complex. SUMMARY

[0003] The utility model provides a kind of PPR overbridge elbow pipe flip-chip injection moulding demolding device to solve the technical problem that the demolding process after overbridge elbow pipe injection moulding in prior art is relatively complex.

[0004] To solve the above problems, the utility model provides a kind of PPR overbridge elbow pipe flip-chip injection moulding demolding device adopts the following technical scheme:

[0005] A kind of PPR overbridge elbow pipe flip-chip injection moulding demolding device, comprising:

[0006] movable mould group and fixed mould group that open and close along up-down direction, movable mould group has first cavity, fixed mould group has second cavity located above first cavity, first cavity and second cavity are oppositely arranged, for being formed into the mould cavity of overbridge elbow pipe external shape, define the two ends of mould cavity corresponding to the two outlet places of overbridge elbow pipe as the left and right two ends of mould cavity;

[0007] first core and second core arranged on fixed mould group, respectively inserted into mould cavity from the left and right sides of mould cavity, first core and second core are spliced into the mould core of overbridge elbow pipe inner cavity, and the outside wall of mould core and the inside wall of mould cavity form injection cavity;

[0008] The hot runner system is arranged in the fixed mold set, and the hot runner system comprises a hot nozzle, and a glue outlet of the hot nozzle is communicated with the injection cavity;

[0009] The first core pulling assembly and the second core pulling assembly are connected with the first core and the second core respectively, and are used for pulling the first core and the second core away from each other.

[0010] The fixed mold set comprises a pushing piece movable in the up-down direction, the pushing piece is located on the side of the first core and the second core away from the movable mold set, and the pushing piece is used for moving towards the movable mold set when the movable mold set leaves the fixed mold set, so as to push the first core, the second core and the bridge elbow pipe out of the second cavity.

[0011] The first core pulling assembly and the second core pulling assembly are used for pulling the first core and the second core away from each other after the bridge elbow pipe, the first core and the second core are separated from the first cavity and the second cavity, so as to pull out the bridge elbow pipe from the inner cavity of the bridge elbow pipe.

[0012] The beneficial effects of the above technical solutions are as follows: due to the arrangement of the hot runner system, the hot nozzle is used for injection molding of the injection cavity, so that the workpiece in the injection cavity is not bonded at the glue inlet after molding, the pushing piece can push the bridge elbow pipe plastic part out of the second cavity, after the bridge elbow pipe plastic part is pushed out, under the condition that there is no other structure to block the outside of the bridge elbow pipe, the bridge elbow pipe group plastic part can be elastically deformed, the first core pulling assembly and the second core pulling assembly are used to pull out the first core and the second core from the bridge elbow pipe plastic part, the demolding process of the bridge elbow pipe plastic part is simpler, and only the first core and the second core are arranged to form the mold core for filling the inner cavity of the bridge elbow pipe, so that the mold structure is simpler.

[0013] Further, the pushing piece is provided with a first stop block and a second stop block, the first stop block and the second stop block are located on the pulling-out paths of the first core and the second core respectively, the first stop block and the second stop block are provided with first pushing faces and second pushing faces facing each other, the first pushing faces are used for pushing the bridge elbow pipe provided on the first core after the bridge elbow pipe is separated from the second core, so that the bridge elbow pipe is separated from the first core, and the second pushing faces are used for pushing the bridge elbow pipe provided on the second core after the bridge elbow pipe is separated from the first core, so that the bridge elbow pipe is separated from the second core.

[0014] The beneficial effects of the above technical solutions are as follows: the first stop block and the second stop block are arranged, so that the bridge elbow pipe is separated from the corresponding first core or second core under the counter-pushing action of the first stop block or the second stop block, and it is guaranteed that the bridge elbow pipe plastic part can automatically fall off from the mold.

[0015] Further, the first pushing faces and the second pushing faces are away from each other in the direction towards the movable mold set.

[0016] The beneficial effects of the above technical solutions are: the first pushing surface and the second pushing surface are away from each other in the direction towards the movable mold set, when the first pushing surface and the second pushing surface push the bridge-bent pipe plastic part, the bridge-bent pipe plastic part can be driven to rotate a set angle in the direction away from the fixed mold set, so that the bridge-bent pipe plastic part falls after rotating the set angle away from the fixed mold set, and collision between the bridge-bent pipe plastic part and some structures in the fixed mold set during falling is avoided.

[0017] Further, the fixed mold set includes a fixed mold block mounting plate, the fixed mold block mounting plate and the pushing piece are arranged in sequence in the up-down direction, a guide column extending in the up-down direction is connected to the fixed mold block mounting plate, the pushing piece is slidingly assembled on the guide column in the up-down direction, a compression spring is connected between the fixed mold block mounting plate and the pushing piece, and the compression spring is used to push the pushing piece away from the mounting plate when the movable mold set leaves the fixed mold set, and to make the pushing piece push the bridge-bent pipe, the first core and the second core out of the second cavity.

[0018] The beneficial effects of the above technical solutions are: the compression spring is connected between the pushing piece and the fixed mold block mounting plate, so that when the movable mold set leaves the fixed mold set, the pushing piece is pushed out of the fixed mold block mounting plate by the compression spring recovering deformation, the pushing piece makes the first core, the second core and the bridge-bent pipe separate from the second cavity, and the pushing piece is pushed out by the elastic force of the compression spring, avoiding the use of a driving mechanism to drive the pushing piece away from the fixed mold block mounting plate, and the structure is simpler.

[0019] Further, a limiting rod is connected between the fixed mold block mounting plate and the pushing piece, a sliding groove extending in the up-down direction is arranged on the fixed mold block mounting plate and / or the pushing piece, and at least one end of the limiting rod is arranged in the corresponding sliding groove and is prevented from being separated from the sliding groove in the up-down direction.

[0020] The beneficial effects of the above technical solutions are: the limiting rod is arranged to limit the movement distance of the pushing piece, so that the pushing piece can move to the same position each time.

[0021] Further, an elastic rubber block is embedded in at least one of the fixed mold block mounting plate and the pushing piece, the elastic rubber block is compressed in the corresponding fixed mold block mounting plate or the pushing piece when the movable mold set is pressed on the fixed mold set, and recovers deformation to protrude from the corresponding fixed mold block mounting plate or the pushing piece when the movable mold set leaves the fixed mold set, so that the pushing piece is pushed out of the fixed mold block mounting plate.

[0022] The beneficial effects of the above technical solutions are: the elastic rubber block is arranged between the pushing piece and the fixed mold block mounting plate, the elastic force generated by the recovery of the compressed elastic rubber block is larger, and the pushing piece can be pushed away from the fixed mold block mounting plate in the first time, so that the separation of the pushing piece and the fixed mold block mounting plate is more rapid and complete.

[0023] Further, the first core-pulling assembly comprises a first oil cylinder and a first sliding block, the first sliding block is connected to the driving output end of the first oil cylinder, the first core is connected to the first sliding block, and the first oil cylinder is used for driving the first sliding block to move in a direction away from the bridge-bent pipe during demolding, so as to pull out the first core from the bridge-bent pipe.

[0024] The second core-pulling assembly comprises a second oil cylinder and a second sliding block, the second sliding block is connected to the driving output end of the second oil cylinder, the second core is connected to the second sliding block, and the second oil cylinder is used for driving the second sliding block to move in a direction away from the bridge-bent pipe during demolding, so as to pull out the second core from the bridge-bent pipe. BRIEF DESCRIPTION OF DRAWINGS

[0025] The above and other objects, features and advantages of the present application will become more apparent from the following detailed description read in conjunction with the accompanying drawings. In the drawings, several embodiments of the present application are illustrated by way of example and not limitation. Like or corresponding reference numerals primarily designate the same or corresponding parts throughout the drawings, in which:

[0026] Figure 1 A cross section of the PPR bridge-bent pipe upside-down injection molding demolding device provided by the present application Figure 1 ;

[0027] Figure 2 A cross section of the PPR bridge-bent pipe upside-down injection molding demolding device provided by the present application Figure 2 ;

[0028] Figure 3 A structure schematic view of the fixed mold group in the PPR bridge-bent pipe upside-down injection molding demolding device provided by the present application

[0029] Figure 4 A structure schematic view of the movable mold group in the PPR bridge-bent pipe upside-down injection molding demolding device provided by the present application

[0030] Figure 5 A structure schematic view of the PPR bridge-bent pipe upside-down injection molding demolding device during working process.

[0031] BRIEF DESCRIPTION OF DRAWINGS

[0032] 1, moving die base plate; 2, moving die insert mounting plate; 3, moving die insert; 301, first cavity; 4, ejector; 401, limiting sliding groove; 5, fixed die insert mounting plate; 6, hot runner plate; 7, fixed die base plate; 8, needle valve cylinder; 9, flow distribution plate; 10, hot nozzle; 11, elastic rubber block; 12, first oil cylinder; 13, first sliding block; 14, first connecting block; 15, first core; 16, first stop block; 1601, first ejector surface; 17, fixed die insert; 18, guide pillar; 19, limiting bolt; 20, guide rod; 21, compression spring; 22, second sliding block; 23, second connecting block; 24, second core; 25, second stop block; 2501, second ejector surface; 26, second oil cylinder; 27, overbridge elbow plastic part. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Those skilled in the art should know that the embodiments described below are only part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0034] The following is one of the embodiments of the PPR overbridge elbow upside-down injection molding demolding device provided by the present application:

[0035] As shown in Figure 1 , Figure 2 , a PPR overbridge elbow upside-down injection molding demolding device includes a moving die set, a fixed die set, a first core 15, a second core 24, a first pulling-out mechanism and a second pulling-out mechanism, and the fixed die set and the moving die set are arranged in sequence along the upward and downward directions.

[0036] The moving die set includes a moving die base plate 1, a moving die insert mounting plate 2 and a moving die insert 3. The moving die insert mounting plate 2 is connected to the moving die base plate 1 by connecting bolts. The moving die insert 3 is embedded in the moving die insert mounting plate 2 and connected to the moving die insert mounting plate 2 by connecting bolts. The moving die insert 3 is provided with a first cavity 301 on the side away from the moving die insert mounting plate 2.

[0037] The fixed mold set comprises a fixed mold base plate 7, a hot runner plate 6, a fixed mold insert mounting plate 5, a pushing piece 4 and a fixed mold insert 17, which are arranged in sequence from top to bottom. The hot runner plate 6 is fixedly connected to the fixed mold base plate 7 by connecting bolts, and a guide column 18 extending in the up-down direction is connected to the hot runner plate 6. The fixed mold insert mounting plate 5, the pushing piece 4 and the movable mold insert mounting plate 2 are all slidingly sleeved on the guide column 18. The fixed mold insert 17 is embedded in the fixed mold insert mounting plate 5 and connected to the fixed mold insert mounting plate 5 by connecting bolts. The pushing piece 4 is a pushing plate, which is sleeved on the outside of the fixed mold insert 17. The side of the fixed mold insert 17 away from the fixed mold insert mounting plate 5 is provided with a second cavity. During the injection molding process, the movable mold set is pressed on the fixed mold set, the movable mold insert 3 is in close contact with the fixed mold insert 17, and the first cavity 301 and the second cavity correspond to form a mold cavity for forming the over-bridge bent pipe plastic part 27.

[0038] The two ends of the mold cavity corresponding to the two pipe outlets of the over-bridge bent pipe are defined as the left and right ends of the mold cavity. The left and right sides of the mold cavity are respectively provided with a first core 15 and a second core 24. The first core 15 and the second core 24 are spliced to form a mold core with an outer shape matching the inner cavity shape of the over-bridge bent pipe plastic part 27. The outer side wall of the mold core and the inner side wall of the mold cavity form an injection cavity.

[0039] The movable mold insert 3 is provided with a plurality of first cavities 301 arranged in the front-rear direction. The fixed mold insert 17 is provided with a plurality of second cavities arranged in the front-rear direction and corresponding to each first cavity 301. When the movable mold set is pressed on the fixed mold set, each first cavity 301 and each corresponding second cavity form a plurality of mold cavities. The left and right sides of each mold cavity are respectively provided with a first core 15 and a second core 24.

[0040] The hot runner plate 6, the fixed mold insert mounting plate 5 and the fixed mold insert 17 are provided with a plurality of hot nozzles 10 arranged in the front-rear direction. The hot nozzles 10 are specifically needle valve type hot runner nozzles. The outlet ends of the hot nozzles 10 are respectively communicated with the injection cavities. The hot runner plate 6 is provided with a shunt channel for connecting the discharge port of the injection molding machine with the inner cavities of the hot nozzles 10. The hot runner plate 6 is also provided with a heating mechanism for heating the inner cavities of the shunt channel and the hot nozzles 10. The fixed mold base plate 7 is provided with a needle valve cylinder 8 for controlling the opening and closing of the needle valve at the outlet end of the needle valve type hot runner nozzle. The shunt channel, the heating mechanism, the needle valve type hot runner nozzle and the needle valve cylinder 8 form a hot runner system, which is a prior art and thus will not be described in detail herein.

[0041] The fixed mold block mounting plate 5 is connected with a guide rod 20 extending in the up-down direction, the ejector 4 is sleeved on the guide rod 20 in the up-down direction, the outer side of the guide rod 20 is sleeved with a compression spring 21, and the two ends of the compression spring 21 are connected with the fixed mold block mounting plate 5 and the ejector 4 respectively. The fixed mold block mounting plate 5 is threadedly connected with a limiting bolt 19, the ejector 4 is provided with a limiting sliding groove 401, and the bolt head of the limiting bolt 19 is inserted into the limiting sliding groove 401 to limit the moving distance of the ejector 4. The fixed mold block mounting plate 5 is provided with a mounting groove with an opening facing the ejector 4, and the mounting groove is connected with an elastic rubber block 11 through a connecting bolt, the elastic rubber block 11 protrudes from the surface of the fixed mold block mounting plate 5 when not subjected to external force, and is compressed into the mounting groove when the movable mold set is pressed on the fixed mold set.

[0042] The compression spring 21 and the elastic rubber block 11 are used to push the ejector 4 away from the fixed mold block mounting plate 5 after the movable mold set leaves the fixed mold set, so that the ejector 4 pushes the first sliding block 13 and the second sliding block 22, and drives the first core 15, the second core 24 and the bridge bent pipe plastic part 27 to separate from the second cavity.

[0043] The ejector 4 is respectively provided with a first pulling-out mechanism and a second pulling-out mechanism on the left and right sides of the fixed mold block 17. The first pulling-out mechanism comprises a first oil cylinder 12 and a first sliding block 13, the first sliding block 13 is connected to the driving output end of the first oil cylinder 12, one end of the first sliding block 13 away from the first oil cylinder 12 is connected with a first connecting block 14, and the first connecting block 14 is connected with a plurality of first cores 15 arranged in the front-back direction at intervals. The second pulling-out mechanism comprises a second oil cylinder 26 and a second sliding block 22, the second sliding block 22 is connected to the driving output end of the second oil cylinder 26, one end of the second sliding block 22 away from the second oil cylinder 26 is connected with a second connecting block 23, and the second connecting block 23 is connected with a plurality of second cores 24 arranged in the front-back direction at intervals. The first oil cylinder 12 and the second oil cylinder 26 are used to drive the first sliding block 13 and the second sliding block 22 to move away from the bridge bent pipe plastic part 27 respectively after the movable mold set leaves the fixed mold set and the bridge bent pipe plastic part 27 separates from the second cavity, so as to pull out the first core 15 and the second core 24 from the bridge bent pipe plastic part 27.

[0044] The ejector 4 is respectively connected with a plurality of first stop blocks 16 and a plurality of second stop blocks 25 on the left and right sides of the fixed mold block 17, the plurality of first stop blocks 16 are arranged in the front-back direction at intervals, the plurality of first stop blocks 16 are arranged between every two adjacent first cores 15 and outside the first cores 15 at the front and back ends respectively, and the plurality of second stop blocks 25 are positionally corresponding to the plurality of first stop blocks 16 in the left-right direction. The first stop block 16 and the second stop block 25 are respectively provided with first pushing faces 1601 and second pushing faces 2501 facing each other, and the first pushing faces 1601 and the second pushing faces 2501 are away from each other in the direction towards the movable mold set.

[0045] The utility model discloses when using, place into such as Figure 5 The described state, the movable die set is first pressed on the fixed die set, the first core 15 and the second core 24 are arranged in the mold cavity, start the injection molding machine, and the molten thermoplastic plastic discharged by the injection molding machine enters each hot nozzle 10 along the hot flow pipeline respectively, the needle valve in the hot nozzle 10 is opened by needle valve cylinder 8 drive, make the molten thermoplastic plastic flow into the injection molding cavity, after filling the thermoplastic plastic in the injection molding cavity, drive the movable die set away from the fixed die set, in the process that the movable die set leaves the fixed die set, the pushing piece 4 is first away from the fixed die insert mounting plate 5 under the action that compression spring 21 and elastic rubber block 11 restore deformation, the pushing piece 4 drives the first sliding block 13 and the second sliding block 22 move towards the direction of movable die set, drive the first core 15, the second core 24 and the bridge bent pipe plastic part 27 from the second cavity on the fixed die insert 17, the movable die set continues to move away from the fixed die set, and the bridge bent pipe plastic part 27 is separated from the first cavity 301 on the movable die insert 3.

[0046] Then the first oil cylinder 12 and the second oil cylinder 26 drive the first sliding block 13 and the second sliding block 22 to move away from the bridge bent pipe plastic part 27, so that the first core 15 and the second core 24 are separated from the bridge bent pipe plastic part 27, one of the first core 15 and the second core 24 will be separated from the bridge bent pipe plastic part 27 first, and the other one of the first core 15 and the second core 24 drives the bridge bent pipe plastic part 27 to continue to move to the side, and finally moves to the corresponding first stop block 16 or second stop block 25, and the bridge bent pipe plastic part 27 is separated from the corresponding first core 15 or second core 24 under the counteracting force of the first pushing surface 1601 or second pushing surface 2501, and the separated bridge bent pipe plastic part 27 falls into the collecting bin below the mold.

[0047] The utility model discloses through first making the bridge bent pipe and injection molding cavity separate after the bridge bent pipe injection molding, then using the first core pulling assembly and the second core pulling assembly to forcibly pull out the first core and the second core in the bridge bent pipe plastic part, utilizing the elastic deformation of the bridge bent pipe plastic part, so that the first core and the second core can be separated from the bridge bent pipe with slope, and the demolding mode is more simple and convenient, and the mold structure is simpler.

[0048] In the embodiment, the first stop block and the second stop block are arranged to counteract the bridge bent pipe plastic part in the process that the bridge bent pipe plastic part is driven to move by the first core and the second core, so that the bridge bent pipe plastic part is separated from the first core or the second core, and in other embodiments, the first stop block and the second stop block can not be arranged, and at this time, the bridge bent pipe plastic part can be manually pulled off from the other core after the bridge bent pipe plastic part is separated from one of the first core and the second core, so that the bridge bent pipe plastic part is separated from the core.

[0049] In the embodiment, the first pushing surface and the second pushing surface on the first block and the second block are away from each other in the direction towards the movable die set.

[0050] In the embodiment, the installation groove with the opening towards the pushing piece is arranged on the fixed die block mounting plate, and the elastic rubber block is connected in the installation groove through the connecting bolt. In other embodiments, the installation groove with the opening towards the fixed die block mounting plate is arranged on the pushing piece, and the elastic rubber block is connected in the installation groove on the pushing piece through the connecting bolt.

Claims

1. A PPR bridge bend inverted injection molding demolding device, characterized in that, include: A moving module and a fixed module that open and close in the vertical direction. The moving module has a first cavity and the fixed module has a second cavity located above the first cavity. The first cavity and the second cavity are arranged opposite to each other to form a mold cavity for forming the external shape of the bridge bend. The two ends in the mold cavity corresponding to the two outlets of the bridge bend are defined as the left and right ends of the mold cavity. The first core and the second core, which are set on the fixed mold assembly, are inserted into the mold cavity from the left and right sides of the mold cavity, respectively. The first core and the second core are spliced ​​together to form the mold core for forming the inner cavity of the bridge bend. The outer side wall of the mold core and the inner side wall of the mold cavity form an injection cavity. A hot runner system is located within a fixed module. The hot runner system includes hot nozzles, and the outlet of the hot nozzles is connected to the injection cavity. The first core-pulling assembly and the second core-pulling assembly are respectively connected to the first core and the second core, and are used to pull the first core and the second core away from each other; The fixed module includes a pusher that can move in the vertical direction. The pusher is located on the side of the first core and the second core away from the moving module. The pusher is used to move toward the moving module when the moving module leaves the fixed module, so as to push the first core, the second core, and the bridge bend out from the second cavity. The first core-pulling assembly and the second core-pulling assembly are used to pull the first core and the second core away from each other after the bridge bend, the first core and the second core are separated from the first cavity and the second cavity, so as to pull them out of the inner cavity of the bridge bend.

2. The PPR bridge bend inverted injection molding demolding device according to claim 1, characterized in that, The pusher is equipped with a first stop and a second stop. The first stop and the second stop are located on the pull-out paths of the first core and the second core, respectively. The first stop and the second stop have a first push surface and a second push surface arranged opposite to each other. The first push surface is used to push the bridge bend sleeved on the first core after the bridge bend is detached from the second core, so that the bridge bend is detached from the first core. The second jacking surface is used to push the bridge bend sleeved on the second core after the bridge bend is detached from the first core, so that the bridge bend is detached from the second core.

3. The PPR bridge bend inverted injection molding demolding device according to claim 2, characterized in that, The first and second push surfaces are far apart from each other in the direction toward the moving module.

4. A PPR bridge bend inverted injection molding demolding device according to any one of claims 1-3, characterized in that, The fixed mold assembly includes a fixed mold insert mounting plate, and the fixed mold insert mounting plate and the ejector are arranged sequentially in the vertical direction. The fixed mold insert mounting plate is connected to a guide post extending in the vertical direction. The ejector is slidably assembled on the guide post in the vertical direction. A compression spring is connected between the fixed mold insert mounting plate and the ejector. The compression spring is used to push the ejector away from the mounting plate when the moving mold leaves the fixed mold, and to push the bridge bend, the first core, and the second core out of the second cavity.

5. A PPR bridge bend inverted injection molding demolding device according to claim 4, characterized in that, A limiting rod is connected between the fixed mold insert mounting plate and the pusher. The fixed mold insert mounting plate and / or the pusher are provided with a sliding groove extending in the vertical direction. At least one end of the limiting rod passes through the corresponding sliding groove and is anti-detached from the sliding groove in the vertical direction.

6. A PPR bridge bend inverted injection molding demolding device according to claim 5, characterized in that, At least one of the fixed mold insert mounting plate and the pusher is provided with an elastic rubber block embedded in it. The elastic rubber block is used to be compressed in the corresponding fixed mold insert mounting plate or pusher when the moving mold is pressed on the fixed mold, and to recover its deformation and protrude out of the corresponding fixed mold insert mounting plate or pusher when the moving mold leaves the fixed mold, so that the pusher can be ejected from the fixed mold insert mounting plate.

7. A PPR bridge bend inverted injection molding demolding device according to any one of claims 1-3, characterized in that, The first core-pulling assembly includes a first hydraulic cylinder and a first slider. The first slider is connected to the drive output end of the first hydraulic cylinder. The first core is connected to the first slider. The first hydraulic cylinder is used to drive the first slider to move in the direction away from the bridge bend during demolding, so as to pull the first core out of the bridge bend. The second core-pulling assembly includes a second hydraulic cylinder and a second slider. The second slider is connected to the drive output end of the second hydraulic cylinder. The second core is connected to the second slider. The second hydraulic cylinder is used to drive the second slider to move in the direction away from the bridge bend during demolding, so as to pull the second core out of the bridge bend.

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