CN114953354B - Injection mold for forming liquid outlet cover and demolding method thereof - Google Patents

Abstract

The invention provides an injection mold for molding a liquid outlet cover, which comprises an upper module, a lower module, a molding assembly and a demolding assembly, wherein the molding assembly and the demolding assembly are arranged on the upper module and the lower module; in addition, the invention also provides a demolding method using the injection molding module, and by reasonably arranging a plurality of limiting mechanisms, the demolding sequence of the product is effectively controlled, the injection molding quality of the product is ensured, and meanwhile, the demolding speed and reliability are improved.

Description

Injection mold for forming liquid outlet cover and demolding method thereof

Technical Field

The invention relates to the field of injection molds, in particular to an injection mold for forming a liquid outlet cover and a demolding method thereof.

Background

In order to facilitate pouring out of liquid content, the existing container for holding liquid content generally comprises a bottle body, a lower cover connected with an opening of the bottle body and an upper cover for covering the lower cover, wherein the lower cover has a structure shown in fig. 1 (a) and 1 (b), and mainly comprises a middle pipe body for discharging liquid and two internal threads, and the two internal threads are respectively used for connecting the bottle body and the upper cover; because the structure of the lower cover is complex, a plurality of inserts are required to be reasonably designed, the cooperation among the inserts is ensured to ensure the quality of products, and meanwhile, the demolding quality and efficiency are also important.

Disclosure of Invention

In order to solve the problems, the invention provides an injection mold for forming a liquid outlet cover and a demolding method thereof.

The main content of the invention comprises:

an injection mold for forming a liquid outlet cover comprises a middle pipe body with a liquid outlet channel, a first side wall connected with the bottom end of the middle pipe body through a first connecting wall extending along the radial direction, and a second side wall connected with the upper end of the first side wall through a second connecting wall extending along the radial direction, wherein the inner wall surface of the first side wall is provided with first threads, and the inner wall surface of the second side wall is provided with second threads; the injection mold comprises an upper mold assembly, a lower mold assembly, a molding cavity formed by the upper mold assembly and the lower mold assembly, and a molding assembly and a demolding assembly;

wherein, the shaping subassembly includes:

the first insert is arranged on the upper die assembly and is used for forming the outer wall of the middle pipe body, the upper side wall of the first connecting wall, the inner wall of the first side wall, the upper side wall of the second connecting wall, the first threads and the outer wall of the second side wall;

the second insert is arranged on the lower die assembly and is used for forming the lower wall of the second connecting wall, the second threads and the lower end face of the second side wall;

the third insert is arranged on the lower die assembly and is used for forming the liquid outlet channel, the lower side wall of the first connecting wall and the outer wall of the first side wall;

the stripper assembly includes:

the first limiting mechanism is arranged on the lower die assembly and is used for demolding the third insert;

the second limiting mechanism is arranged on the upper die assembly and is used for demolding the first insert;

the third limiting mechanism is arranged on the lower die assembly and is used for demolding the second insert;

and an auxiliary mechanism for assisting the first limit mechanism, the second limit mechanism and the third limit mechanism.

Preferably, the upper die assembly comprises a hot runner plate and a front die push ring fixing plate which are arranged up and down; the lower die assembly comprises a lower fixing plate, a rear die insert fixing plate, a thread bush mounting plate, a thread insert mounting plate and a rear die push sleeve fixing plate which are sequentially arranged from bottom to top; and in the die assembly state, the front die pushing ring fixing plate and the rear die pushing ring fixing plate form the forming cavity.

Preferably, the first insert comprises a front mold insert and an inclined guide pillar module which are arranged on the hot runner plate, and a front mold pushing ring which is arranged on the front mold pushing ring fixing plate; the front mold insert is used for forming the outer wall of the middle pipe body, the upper side wall of the first connecting wall, the inner wall of the first side wall and the first threads; the front mould pushing ring is used for forming the upper side wall of the second connecting wall; the oblique guide pillar module is used for forming the outer wall of the second side wall.

Preferably, the second insert comprises a thread bush arranged on the thread bush mounting plate, a movable thread insert with one end in threaded connection with the thread bush, a rear die pushing bush arranged on the rear die pushing bush fixing plate and a rotation stopping tooth insert arranged on the thread insert mounting plate; the other end of the movable thread insert extends into the forming cavity and is used for forming the lower wall of the second connecting wall and the second threads; the anti-rotation tooth insert is used for forming part of the second side wall, and the rear die sleeve is used for forming the lower end face of the second side wall.

Preferably, the second insert further comprises a precise tooth adjusting block, the threaded sleeve comprises a sleeve internal thread in threaded connection with the movable threaded insert and a sleeve external thread arranged on the outer wall surface of the threaded sleeve, and the precise tooth adjusting block is meshed with the sleeve external thread;

the precise tooth adjusting block comprises a tooth block body, wherein the tooth block body is provided with a body center line, an upper tooth group and a lower tooth group are oppositely arranged on two side edges perpendicular to the body center line, and the minimum distance between an upper tooth in the upper tooth group and the body center line is ap/M; the minimum distance between the lower teeth in the lower tooth group and the central line of the body is bp/M, and a+b=M/2, wherein a, b and M are natural numbers, and p represents the tooth pitch.

Preferably, the third insert comprises a first rear mold insert with one end disposed on the rear mold insert fixing plate, and the other end of the first rear mold insert extends into the molding cavity; the other end of the first rear mold insert is connected with a second rear mold insert, and the first rear mold insert is used for forming the liquid outlet channel; the second rear mold insert is used for forming the outer wall of the first side wall, and the first rear mold insert and the second rear mold insert are used for jointly forming the lower side wall of the first connecting wall; the movable thread insert is provided with a movable thread through hole extending along the axial direction, and the first rear die insert is arranged in the movable thread through hole in a penetrating mode through a bearing.

Preferably, the first limiting mechanism comprises a rear die limiting screw and a rear die limiting spring, the rear die limiting screw is fixedly arranged on the rear die insert fixing plate, and the rear die limiting spring is sleeved outside the rear die limiting screw and is positioned between the rear die insert fixing plate and the thread bush mounting plate; in a die closing state, the rear die limiting screw extends to the upper part of the threaded sleeve mounting plate and has a set limiting stroke, and the rear die limiting spring is in a compression state;

the second limiting mechanism comprises a front die limiting screw with one end fixedly arranged on the hot runner plate and a front die limiting blind hole formed in the lower end face of the front die pushing ring fixing plate, and the other end of the front die limiting screw extends into the front die limiting blind hole;

the third limiting mechanism comprises a driving external thread formed on the outer wall of the movable thread insert, a driving rack and a tooth withdrawing driving mechanism which are arranged in the thread insert mounting plate in a penetrating manner, a third limiting screw fixedly arranged on the thread insert mounting plate, a third limiting sleeve sleeved outside the third limiting screw and a third limiting spring; the driving external thread is meshed with the driving rack, and the tooth-withdrawing driving mechanism drives the driving rack to reciprocate;

the auxiliary limiting mechanism comprises a damping limiting module and at least one group of travel limiting modules.

Preferably, the tooth-backing driving mechanism comprises a driving motor and a driving gear, wherein the driving motor is connected with the driving gear, and the driving gear is meshed with the driving rack.

Preferably, the damping limiting module comprises a first auxiliary screw fixedly arranged on the front mould pushing ring fixing plate, a second auxiliary screw fixedly arranged on the threaded insert mounting plate, an auxiliary connecting rod, a nylon shutter and a nylon sleeve, wherein the first auxiliary screw and the second auxiliary screw are respectively fixedly connected with the auxiliary connecting rod; the nylon shutter and the nylon sleeve are sleeved on the first auxiliary screw and are positioned between the front die pushing ring fixing plate and the rear die pushing sleeve fixing plate;

the stroke limiting module comprises a first precise distance screw fixedly arranged on the front die pushing ring fixing plate, a second precise distance screw fixedly arranged on the rear die pushing sleeve fixing plate and an auxiliary pull rod, wherein a first waist round hole and a second waist round hole are formed in the auxiliary pull rod, the first precise distance screw is arranged in the first waist round hole, and the second precise distance screw is arranged in the second waist round hole.

The invention also provides a demolding method using the injection mold, which comprises the following steps:

first parting: the injection molding machine drives the lower die assembly to retreat so as to separate the third insert from the product;

parting for the second time: the injection molding machine drives the lower die assembly to continuously retreat, so that the first insert is separated from the product;

and (3) withdrawing the second thread: separating the second insert from the product using the third spacing mechanism;

and (3) parting for the third time: the injection molding machine drives the lower die assembly to continuously retreat, and the molding cavity is opened;

fourth parting: the injection molding machine drives the lower die assembly to continuously retreat, so that the product falls off;

removing teeth;

wherein the order of the thread-stripping second thread step and the third parting step can be interchanged.

The invention has the beneficial effects that: according to the injection mold for forming the liquid outlet cover and the demolding method thereof, the manufacturing cost of the injection mold is reduced and the injection efficiency is improved by reasonably arranging all the inserts for forming; in addition, through reasonable setting up a plurality of stop gear, the drawing of patterns order of effective control product has improved the speed and the reliability of drawing of patterns when guaranteeing the product quality of moulding plastics.

Drawings

FIG. 1 (a) is a schematic diagram of the overall structure of a liquid outlet cover to be injection molded according to the present invention;

FIG. 1 (b) is a schematic cross-sectional view of a liquid outlet cap to be injection molded according to the present invention;

FIG. 2 is a schematic diagram of the overall structure of the present invention;

FIG. 3 is a schematic cross-sectional view at an angle of the present invention;

FIG. 4 is a schematic cross-sectional view of another angle of the present invention;

FIG. 5 is a schematic view of a molding assembly according to the present invention;

FIGS. 6 (a) to (d) are schematic views showing four mounting modes of the fine tooth adjusting block according to the present invention;

FIG. 7 is a schematic view of a third limiting mechanism according to the present invention;

FIG. 8 is a schematic view of an auxiliary limiting mechanism according to the present invention;

FIG. 9 is a schematic diagram of a stripping sequence of the present invention;

reference numerals:

1-1-middle pipe body; 1-100-liquid outlet channels; 1-2-a first connecting wall; 1-3-a first sidewall; 1-300-first threads;

1-4-second connecting wall; 1-5-second side walls; 1-500-second threads; 1-510-anti-skid grooves;

a1-a hot runner plate; a2-a front mould pushing ring fixing plate; b1-positioning ring; b2-lower fixing plate; b3-a rear mold insert fixing plate;

b4-a thread bush mounting plate; b5-a threaded insert mounting plate; b6-pushing the sleeve fixing plate by the rear die;

1-forming an assembly; 11-a first insert; 110-front mold insert; 111-a front mould pushing ring; 112-an oblique guide post module; 1120-slider mount; 1121-a slider; 1122-oblique guide post; 1123-a slider lock; 1124-backhoe block; 120-cover plate; 121-a threaded sleeve; 122-moving thread insert; 123-pushing the rear die; 124-a rotation-stopping tooth insert; 125-a precise tooth adjusting block; 1250-tooth block body; 1251-upper teeth; 1252-lower teeth; 130-a first rear mold insert; 131-a second rear mold insert; 132-a sprinkler tube assembly; 14-a bearing;

20-a first limiting mechanism; 200-a rear die limit screw; 201-a rear die limiting spring; 202-locking a screw;

210-a front mold limit screw; 211-a front mold limiting blind hole;

220-driving external threads; 221-driving a rack; 223-drive gear; 224-rack stopper; 225-third limit screw

A silk; 226-a third stop collar; 227-a third limit spring;

230-auxiliary connecting rods; 231-a first auxiliary screw; 232-a second auxiliary screw; 233-nylon shutter; 234-Nib

A dragon sleeve;

240-auxiliary pull rod; 2400-first lumbar aperture; 2410-a second round lumbar hole; 241-first precision distance screw; 242-second precision distance screw.

Detailed Description

The technical scheme protected by the invention is specifically described below with reference to the accompanying drawings.

The invention provides an injection mold for forming a liquid outlet cover, the structure of which is shown in fig. 1 (a) and 1 (b), specifically, the liquid outlet cover comprises a middle pipe body 1-1 with a liquid outlet channel, a first side wall 1-3 connected with the bottom end of the middle pipe body 1-1 through a first connecting wall 1-2 extending along the radial direction, and a second side wall 1-5 connected with the upper end of the first side wall 1-3 through a second connecting wall 1-4 extending along the radial direction, wherein the inner wall surface of the first side wall 1-3 is provided with a first thread 1-300, the inner wall surface of the second side wall 1-5 is provided with a second thread 1-500, and further, as shown in fig. 1 (a), the outer wall surface of the second side wall 1-5 is also provided with an anti-skid groove 1-510.

In view of the above structure of the liquid outlet cover, the present invention provides an injection mold having the following structure, including:

the upper die assembly comprises a hot runner plate A1 and a front die pushing ring fixing plate A2 which are arranged up and down;

the lower die assembly comprises a positioning ring B1, a lower fixing plate B2, a rear die insert fixing plate B3, a thread bush mounting plate B4, a thread insert mounting plate B5 and a rear die push sleeve fixing plate B6 which are sequentially arranged from bottom to top; wherein, the rear mould pushing sleeve fixing plate B6 and the front mould pushing ring fixing plate A2 are assembled to form a forming cavity for forming;

the molding assembly comprises a first insert, a second insert and a third insert, and the demolding assembly comprises a first limiting mechanism, a second limiting mechanism, a third limiting mechanism and an auxiliary limiting mechanism.

Referring to fig. 2, 3 and 5, the first insert includes a front mold insert 110 and an oblique guide pillar module disposed on the hot runner plate A1, and a front mold push ring 111 disposed on the front mold push ring fixing plate A2; specifically, the front mold insert 110 is used for molding the outer wall of the intermediate pipe body 1-1, the upper side wall of the first connecting wall 1-2, the inner wall of the first side wall 1-3, and the first threads 1-300; and the front mold pushing ring 111 is used for forming the upper side wall of the second connecting wall 1-4; the oblique guide pillar module is used for forming the outer wall of the second side wall 1-5 and the anti-skid groove 1-510 arranged on the second side wall 1-5.

Referring to fig. 3, in the present embodiment, the oblique guide pillar module includes a slider locking block 1123 fixed on the hot runner plate A1 and an oblique guide pillar 1122, the oblique guide pillar 1122 is disposed in a slider seat 1120, one side of the slider seat 1120 is connected with a slider 1121, and the slider 1121 is used for forming the outer wall of the second side wall 1-5 and the anti-slip groove 1-510; a backhoe block 1124 is also provided on one side of the slider lock 1123 to allow the slider 1121 to be separated from the product as the diagonal guide post 1122 moves.

The second insert comprises a thread bush 121 arranged on the thread bush mounting plate B4, a movable thread insert 122 with one end in threaded connection with the thread bush 121, a rear die pushing sleeve 123 arranged on the rear die pushing sleeve fixing plate B6, and a rotation stopping tooth insert 124 arranged on the thread bush mounting plate B5; specifically, the inner wall of the central hole of the threaded sleeve 121 is provided with a sleeve internal thread, the lower end of the movable threaded insert 122 is correspondingly provided with an external thread, the movable threaded insert 122 is rotated by a third limiting mechanism, so that the movable threaded insert can move up and down relative to the threaded sleeve 121, and the structure of the third limiting mechanism will be described in detail later.

Further, the other end of the movable thread insert 122 extends into the molding cavity for molding the lower wall of the second connecting wall 1-4 and the second threads 1-500; the anti-rotation tooth insert 124 is used for forming part of the second side wall 1-5 and is used for receiving the dropped product in the final stage of demolding, the rear mold push sleeve 123 is used for forming the lower end surface of the second side wall 1-5, and a certain ejection force is applied to the product along with the movement of the rear mold push sleeve fixing plate B6 in the final stage of demolding, so that the product can drop smoothly.

In addition, referring to fig. 5 and fig. 6 (a) to 6 (d), preferably, the second insert further includes a precision tooth adjustment block 125, the threaded sleeve 121 includes a sleeve external thread formed on an outer wall surface thereof, and the precision tooth adjustment block 122 is engaged with the sleeve external thread; the precise tooth adjusting block 125 not only can prevent the threaded sleeve 121 from rotating along with the movable threaded insert 122, but also can compensate for the uncertainty of machining of the starting point of the thread on the thread hole on the threaded sleeve 121.

Specifically, in view of limitations of machining precision and the like, there is a certain uncertainty in the position of the start point of the thread on the thread bush 121, so that there is a possibility that the height position of the movable thread insert 122 in the forming cavity deviates from the design, and accurate forming according to the drawing design is not possible. In order to solve the above problems, the present invention designs the structure of the fine tuning block 125, as shown in fig. 6, the fine tuning block 125 includes a block body 1250, the block body 1250 has a body center line L, and an upper set of teeth and a lower set of teeth are disposed opposite to two sides perpendicular to the body center line L, wherein a minimum distance between an upper tooth 1251 of the upper set of teeth and the body center line L is denoted as ap/M; the minimum distance between the lower teeth 1252 in the lower set of teeth and the body centerline L is noted as bp/M, and a+b=m/2, where a, b, M are natural numbers and p represents the pitch, in this embodiment a is preferably 3, b is preferably 1, and M is preferably 8, i.e. as shown in fig. 6 (a), the distance between one of the upper teeth 1251 and the body centerline L is (3 x pi x M)/8, where M is the tooth modulus, in this embodiment 1; the distance between the lower tooth 1252 and the body center line L is (1 x pi x m)/8; in actual use, the four mounting methods shown in fig. 6 can be used according to the requirement, so that the intermediate tooth forms can be respectively adjusted by 1/4 tooth pitch relative to the movable thread insert 122; in a specific embodiment, the pitch of the molded product is set to be 4.25mm, and the number of teeth on the thread bushing 121 is 10, so that the precision of the adjustment of the movable thread insert 122 can be controlled within 0.01 through the precision tooth adjusting block 125.

The third insert comprises a first rear mold insert 130 with one end arranged on the rear mold insert fixing plate B3, and the other end of the first rear mold insert 130 extends into the forming cavity; the other end of the first rear mold insert 130 is connected with a second rear mold insert 131 through a pin, and specifically, the first rear mold insert 130 is used for forming the liquid outlet channels 1-100; the second rear mold insert 131 is used for molding the outer wall of the first side wall 1-3, and in this embodiment, the first rear mold insert 130 and the second rear mold insert 131 jointly mold the lower side wall of the first connecting wall 1-2.

Further, a moving thread through hole extending in an axial direction is formed in the center of the moving thread insert 122, the first rear mold insert 130 is disposed in the moving thread through hole in a penetrating manner through the bearing 14, and when the moving thread insert 122 is driven to rotate by the third limiting mechanism, the first rear mold insert 130 does not rotate therewith.

In other embodiments, to perform the cooling function, a spray tube assembly 132 extending in the axial direction is also provided within the first rear mold insert 130, as shown in fig. 2 and 3.

In order to realize high-quality and low-damage demolding, the positions of the first limiting mechanism, the second limiting mechanism and the third limiting mechanism are reasonably distributed, and the demolding sequence is reasonably designed under the cooperation of the auxiliary limiting mechanisms.

Referring to fig. 4 and 9, the first limiting mechanism 20 includes a rear die limiting screw 200 and a rear die limiting spring 201, wherein the rear die limiting screw 200 is fixedly disposed on the rear die insert fixing plate B3, and the rear die limiting spring 201 is sleeved outside the rear die limiting screw 200 and between the rear die insert fixing plate B3 and the threaded sleeve mounting plate B4; in the mold closing state, the rear mold limiting screw 200 extends to the upper side of the threaded sleeve mounting plate B4 and has a set limiting stroke S1, and the rear mold limiting spring 201 is in a compressed state; meanwhile, the thread bush mounting plate B4 and the thread insert mounting plate B5 are locked through a locking screw 205, and when the injection molding machine drives the lower die assembly to move downwards through the positioning ring B1, the rear die insert fixing plate B3 can be separated from the thread bush mounting plate B4 by the stroke of S1 under the action of the reset force of the rear die limiting screw 200; and since the first rear mold insert 130 is fixedly disposed on the rear mold insert fixing plate B3, the first rear mold insert 130 is separated from the product with the stroke of the backward movement S1.

Referring to fig. 3, the second limiting mechanism includes a front mold limiting screw 210 with one end fixed on the hot runner plate A1 and a front mold limiting blind hole 211 formed on the lower end surface of the front mold pushing ring fixing plate A2, the other end of the front mold limiting screw 210 extends into the front mold limiting blind hole 211, and in the demolding process, when the hot runner plate A1 is separated from the front mold pushing ring fixing plate A2, the second limiting mechanism can limit the separation stroke of the two, which can be denoted as S2, because the front mold insert 110 is fixed on the hot runner plate A1, and the front mold pushing ring 111 is fixed on the front mold pushing ring fixing plate A2, when the hot runner plate A1 is separated from the front mold pushing ring fixing plate A2, the front mold insert 110 can be strongly separated from a product under the action of the front mold pushing ring 111.

Referring to fig. 3 and 7, the third limiting mechanism includes a driving external thread 220 formed on the outer wall of the movable threaded insert 122, a driving rack 221 and a tooth-withdrawing driving mechanism penetrating through the threaded insert mounting plate B5, a third limiting screw 225 fixedly formed on the threaded insert mounting plate B5, a third limiting sleeve 226 and a third limiting spring 227 sleeved outside the third limiting screw 225; wherein the driving external thread 220 is meshed with the driving rack 221, and the tooth-withdrawing driving mechanism drives the driving rack 221 to reciprocate; when the screw insert mounting plate B5 is separated from the rear mold push sleeve fixing plate B6, the third limit screw 225, the third limit sleeve 226 and the third limit spring 227 define a separate stroke, denoted as S4, and the anti-rotation tooth insert 124 is fixed on the screw insert mounting plate B5, while the rear mold push ring 123 is fixed on the rear mold push ring fixing plate B6, and the product is also separated from other inserts at this time, so that the product falls onto the anti-rotation tooth insert 124, thereby completing the final demolding.

In one embodiment, the tooth withdrawing driving mechanism includes a driving motor and a driving gear 223, the driving motor is connected with the driving gear 223 to drive the driving gear 223 to rotate, and the driving gear 223 is meshed with the driving rack 221 to drive the driving rack 221 to move up and down, so as to drive the movable thread insert 122 to screw in or screw out.

Referring to fig. 3, 8 and 9, the auxiliary limiting mechanism includes a damping limiting module and at least one set of travel limiting module. The damping limiting module comprises a first auxiliary screw 231 fixedly arranged on the front die pushing ring fixing plate A2, a second auxiliary screw 232 fixedly arranged on the threaded insert mounting plate B5, an auxiliary connecting rod 230, a nylon shutter 233 and a nylon sleeve 234, wherein the first auxiliary screw 231 and the second auxiliary screw 232 are respectively fixedly connected with the auxiliary connecting rod 230; the nylon shutter 233 and the nylon sleeve 234 are sleeved on the first auxiliary screw 231 and are positioned between the front die pushing ring fixing plate A2 and the rear die pushing sleeve fixing plate B6; the damping limiting module can control the die opening sequence of the whole die, and the die opening sequence is described in detail later.

As shown in fig. 8, in this embodiment, the stroke limiting modules include two groups, each of the two groups of stroke limiting modules includes a first precise distance screw 241 fixedly disposed on the front mold push ring fixing plate A2, a second precise distance screw 242 fixedly disposed on the rear mold push sleeve fixing plate B6, and an auxiliary pull rod 240, a first kidney hole 2400 and a second kidney hole 2410 are formed in the auxiliary pull rod 240, the first precise distance screw 241 is disposed in the first kidney hole 2400, and the second precise distance screw 242 is disposed in the second kidney hole 2410. When the front mold push ring fixing plate A2 is separated from the rear mold push ring fixing plate B6, the stroke limiting module can limit the stroke of the separation of the front mold push ring fixing plate A2 and the rear mold push ring fixing plate B6, i.e. the lengths of the first kidney hole 2400 and the second kidney hole 2410 are respectively denoted as S5 and S6.

The demolding method using the injection mold of the present invention will be described in detail below, including the steps of:

first typing PL1: the injection molding machine drives the lower die assembly to retreat, so that the third insert is separated from the product:

specifically, as the injection molding machine drives the lower die assembly to retreat, since the thread bush mounting plate B4 and the thread insert mounting plate B5 are locked by the locking screw 202, simultaneously, the front die pushing ring fixing plate A2, the rear die pushing bush fixing plate B6 and the thread insert fixing plate B5 are not separated under the action of the damping limiting assembly, and the first parting at this time only occurs between the rear die insert fixing plate B3 and the thread bush mounting plate B4, and simultaneously, the first rear die insert 130 and the second rear die insert 131 withdraw products along with the stroke of retreating S1.

Second typing PL2: the injection molding machine drives the lower die assembly to continuously retreat, so that the first insert is separated from the product:

as the injection molding machine continues to drive the lower die assembly to retreat, the damping limiting assembly enables the front die pushing ring fixing plate A2, the rear die pushing ring fixing plate B6 and the thread insert mounting plate B5 to continue to be locked, so that the front die pushing ring fixing plate A2 retreats S2 relative to the hot runner plate A1, and under the action of the front die pushing ring 111, a product is forced to deviate from the first threads 1-300 in the front die insert 110; simultaneously, the slider seat 1120 drives the slider 1121 to open under the action of the oblique guide post 1122, so that the back-off on the outer side of the product is disengaged.

Third typing PL3: the injection molding machine drives the lower die assembly to continuously retreat, and the molding cavity is opened:

along with the continuous retreating of injection molding machine drive lower module, the spacing subassembly of damping makes preceding mould push away circle fixed plate A2 with back mould push away cover fixed plate B6 separation, simultaneously under the effect of the spacing subassembly of stroke, make preceding mould push away circle fixed plate A2 with back mould push away the stroke that cover fixed plate B6 separated S5+S6, thereby make go up module and lower module are opened completely.

And (3) withdrawing the second thread: and separating the second insert from the product by using the third limiting mechanism:

the step is to withdraw the movable thread insert 122 from the product by using a withdrawal driving mechanism, and the step can be performed after the third parting PL3 or before the third parting PL3 step, and the order of withdrawing the second threads can be selected according to the actual mold test condition and the product structure.

Fourth parting: the injection molding machine drives the lower die assembly to continuously retreat, so that the product falls off:

after the demolding of the second threads 1-500 is completed, the injection molding machine drives the lower die set to continue to retreat, and because the travel limiting module moves in place, at this time, the rear die push sleeve fixing plate B6 and the threaded insert mounting plate B5 are separated by S4 travel, along with the retreating of the threaded insert mounting plate B5, the rotation-stopping tooth insert 124 retreats along with the retreating, and the rear die push ring 123 advances relative to the product, and a certain ejection force is applied to the product to enable the product to fall onto the rotation-stopping tooth insert 124, so that the demolding is completed.

After demoulding and taking out the product, resetting the mould. In this embodiment, the resetting may be performed as follows:

firstly, the tooth withdrawing driving mechanism drives the driving rack 221 to drive the movable thread insert 122 to perform tooth withdrawing movement under the action of the thread sleeve 121;

then, the molds are clamped, wherein the clamping sequence can be that the clamping of the threaded insert mounting plate B5 and the rear mold push sleeve fixing plate B6 is finished firstly, then the clamping of the front mold push ring fixing plate A2 and the hot runner plate A1 is finished, then the clamping of the front mold push ring fixing plate A2 and the rear mold push sleeve fixing plate B6 is finished, and finally the clamping of the rear mold insert fixing plate B3 and the threaded sleeve mounting plate B4 is finished; in other embodiments, after the front mold pushing ring fixing plate A2 and the hot runner plate A1 are closed, the closing force of the damping limiting assembly and the elastic force of the rear mold limiting spring 201 may be adjusted to first complete the closing of the rear mold insert fixing plate B3 and the threaded sleeve mounting plate B4, and finally, the closing of the front mold pushing ring fixing plate A2 and the rear mold pushing sleeve fixing plate B6 may be performed.

The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent structures or equivalent processes or direct or indirect application in other related technical fields are included in the scope of the present invention.

Claims (8)

1. An injection mold for forming a liquid outlet cover comprises a middle pipe body with a liquid outlet channel, a first side wall connected with the bottom end of the middle pipe body through a first connecting wall extending along the radial direction, and a second side wall connected with the upper end of the first side wall through a second connecting wall extending along the radial direction, wherein the inner wall surface of the first side wall is provided with first threads, and the inner wall surface of the second side wall is provided with second threads; the injection mold is characterized by comprising an upper mold assembly, a lower mold assembly, a molding cavity formed by the upper mold assembly and the lower mold assembly, a molding assembly and a demolding assembly;

wherein, the shaping subassembly includes:

the first insert is arranged on the upper die assembly and is used for forming the outer wall of the middle pipe body, the upper side wall of the first connecting wall, the inner wall of the first side wall, the upper side wall of the second connecting wall, the first threads and the outer wall of the second side wall;

the second insert is arranged on the lower die assembly and is used for forming the lower wall of the second connecting wall, the second threads and the lower end face of the second side wall;

the third insert is arranged on the lower die assembly and is used for forming the liquid outlet channel, the lower side wall of the first connecting wall and the outer wall of the first side wall;

the stripper assembly includes:

the first limiting mechanism is arranged on the lower die assembly and is used for demolding the third insert;

the second limiting mechanism is arranged on the upper die assembly and is used for demolding the first insert;

the third limiting mechanism is arranged on the lower die assembly and is used for demolding the second insert;

and an auxiliary mechanism for assisting the first, second and third limit mechanisms;

the upper die assembly comprises a hot runner plate and a front die pushing ring fixing plate which are arranged up and down; the lower die assembly comprises a lower fixing plate, a rear die insert fixing plate, a thread bush mounting plate, a thread insert mounting plate and a rear die push sleeve fixing plate which are sequentially arranged from bottom to top; in a die assembly state, the front die pushing ring fixing plate and the rear die pushing sleeve fixing plate form the forming cavity;

the first insert comprises a front mold insert and an inclined guide pillar module which are arranged on the hot runner plate, and a front mold pushing ring which is arranged on the front mold pushing ring fixing plate; the front mold insert is used for forming the outer wall of the middle pipe body, the upper side wall of the first connecting wall, the inner wall of the first side wall and the first threads; the front mould pushing ring is used for forming the upper side wall of the second connecting wall; the inclined guide pillar module is used for forming the outer wall of the second side wall;

the second insert comprises a thread bush arranged on the thread bush mounting plate, a movable thread insert with one end in threaded connection with the thread bush, a rear die push bush arranged on the rear die push bush fixing plate and a rotation-stopping tooth insert arranged on the thread insert mounting plate; the other end of the movable thread insert extends into the forming cavity and is used for forming the lower wall of the second connecting wall and the second threads; the anti-rotation tooth insert is used for forming part of the second side wall, and the rear die sleeve is used for forming the lower end face of the second side wall.

2. The injection mold for forming a liquid outlet cover according to claim 1, wherein the second insert further comprises a precision tooth adjusting block, the threaded sleeve comprises a sleeve internal thread in threaded connection with the movable threaded insert and a sleeve external thread arranged on the outer wall surface of the threaded sleeve, and the precision tooth adjusting block is meshed with the sleeve external thread;

the precise tooth adjusting block comprises a tooth block body, wherein the tooth block body is provided with a body center line, an upper tooth group and a lower tooth group are oppositely arranged on two side edges perpendicular to the body center line, and the minimum distance between an upper tooth in the upper tooth group and the body center line is ap/M; the minimum distance between the lower teeth in the lower tooth group and the central line of the body is bp/M, and a+b=M/2, wherein a, b and M are natural numbers, and p represents the tooth pitch.

3. The injection mold for molding a liquid cap according to claim 1, wherein the third insert includes a first rear mold insert having one end disposed on the rear mold insert fixing plate, the other end of the first rear mold insert extending into the molding cavity; the other end of the first rear mold insert is connected with a second rear mold insert, and the first rear mold insert is used for forming the liquid outlet channel; the second rear mold insert is used for forming the outer wall of the first side wall, and the first rear mold insert and the second rear mold insert are used for jointly forming the lower side wall of the first connecting wall; the movable thread insert is provided with a movable thread through hole extending along the axial direction, and the first rear die insert is arranged in the movable thread through hole in a penetrating mode through a bearing.

4. The injection mold for molding a liquid outlet cover according to claim 1, wherein the first limiting mechanism comprises a rear mold limiting screw and a rear mold limiting spring, the rear mold limiting screw is fixedly arranged on the rear mold insert fixing plate, and the rear mold limiting spring is sleeved outside the rear mold limiting screw and is positioned between the rear mold insert fixing plate and the thread bush mounting plate; in a die closing state, the rear die limiting screw extends to the upper part of the threaded sleeve mounting plate and has a set limiting stroke, and the rear die limiting spring is in a compression state;

the second limiting mechanism comprises a front die limiting screw with one end fixedly arranged on the hot runner plate and a front die limiting blind hole formed in the lower end face of the front die pushing ring fixing plate, and the other end of the front die limiting screw extends into the front die limiting blind hole;

the third limiting mechanism comprises a driving rack and a tooth withdrawing driving mechanism which are arranged in the threaded insert mounting plate in a penetrating manner, a third limiting screw fixedly arranged on the threaded insert mounting plate, a third limiting sleeve sleeved outside the third limiting screw and a third limiting spring; the tooth withdrawing driving mechanism drives the driving rack to reciprocate;

the auxiliary mechanism comprises a damping limiting module and at least one group of travel limiting modules.

5. The injection mold for molding a liquid outlet cover according to claim 4, wherein the tooth-withdrawal driving mechanism comprises a driving motor and a driving gear, the driving motor is connected with the driving gear, and the driving gear is meshed with the driving rack.

6. The injection mold for forming a liquid outlet cover according to claim 4, wherein the damping limiting module comprises a first auxiliary screw fixedly arranged on the front mold push ring fixing plate, a second auxiliary screw fixedly arranged on the threaded insert mounting plate, an auxiliary connecting rod, a nylon shutter and a nylon sleeve, wherein the first auxiliary screw and the second auxiliary screw are fixedly connected with the auxiliary connecting rod respectively; the nylon shutter and the nylon sleeve are sleeved on the first auxiliary screw and are positioned between the front die pushing ring fixing plate and the rear die pushing sleeve fixing plate;

the stroke limiting module comprises a first precise distance screw fixedly arranged on the front die pushing ring fixing plate, a second precise distance screw fixedly arranged on the rear die pushing sleeve fixing plate and an auxiliary pull rod, wherein a first waist round hole and a second waist round hole are formed in the auxiliary pull rod, the first precise distance screw is arranged in the first waist round hole, and the second precise distance screw is arranged in the second waist round hole.

7. A method of demolding an injection mold for molding a liquid outlet cover according to any one of claims 1 to 6, comprising the steps of:

first parting: the injection molding machine drives the lower die assembly to retreat so as to separate the third insert from the product;

parting for the second time: the injection molding machine drives the lower die assembly to continuously retreat, so that the first insert is separated from the product;

and (3) withdrawing the second thread: separating the second insert from the product using the third spacing mechanism;

and (3) parting for the third time: the injection molding machine drives the lower die assembly to continuously retreat, and the molding cavity is opened;

fourth parting: the injection molding machine drives the lower die assembly to continuously retreat, so that the product falls off;

resetting.

8. The method of demolding an injection mold for molding a liquid discharge cap according to claim 7, wherein the sequence of the second thread-withdrawing step and the third parting step is interchanged.