CN111673984A

CN111673984A - Mould of half push pipe demoulding mechanism with pipe joint end cover edge covering

Info

Publication number: CN111673984A
Application number: CN202010416256.6A
Authority: CN
Inventors: 华明伟
Original assignee: Ningbo Zheng Jia Molding Co ltd
Current assignee: Ningbo Zheng Jia Molding Co ltd
Priority date: 2020-05-17
Filing date: 2020-05-17
Publication date: 2020-09-18

Abstract

The invention relates to a mould of a pipe joint end cover edge-covered half push pipe demoulding mechanism, which comprises a movable mould plate, an upper mould base plate and a panel, wherein the upper mould base plate and the panel are arranged above the movable mould plate; and a positioning ring and a sprue bushing are arranged on the panel, the sprue bushing is communicated with the mold cavity, and the bottom of the mold cavity is correspondingly provided with an edge-covering insert ejection demolding mechanism. In the mechanism, after a formed part on the outer wall of the pipe joint column is divided into two half jacking pipes, the two half jacking pipes are driven to move towards the side edges through the first ejection of the secondary ejection plate mechanism by the guide blocks, so that the left primary separation of the outer wall of the pipe joint column and the formed part is realized firstly, and the complete demoulding of a plastic part is realized.

Description

Mould of half push pipe demoulding mechanism with pipe joint end cover edge covering

Technical Field

The invention relates to the field of injection molds, in particular to a mold of a half push pipe demolding mechanism with a pipe joint end cover edge covering.

Background

The structural dimension of the plastic part with the pipe joint end cover is shown in figures 1a, 1b and 1c, the plastic part is required to be formed by injection molding of ABS material, and the average wall thickness of the plastic part is.mm. The plastic part is mainly characterized by a screw column hole, a boss, a cylindrical hole and the like; one of the larger features is the pipe joint column feature on the plastic part, which is a straight pipe wall feature, but the lower end of which is provided with an expansion chuck.

The mold has the advantages that by combining the shape characteristics of the plastic part, when the mold structure is designed, no special difficulty exists in the opening, parting setting, exhaust design and the like of a pouring system of the plastic part, and the difficulty lies in the large number of hole sites on the upper end surface and the lower end surface of the plastic part and the characteristic demolding of a joint pipe column. Because the upper end and the lower end have more hole characteristics, the packing force of the formed die cavity piece after the plastic piece is formed is very large, and the die is difficult to be demolded during demolding; the joint pipe column is characterized in that an expansion chuck at the lower end of the joint pipe column forms a whole-circle annular back-off which can damage a plastic part if a forced demoulding mode is adopted, when other sliding block mechanisms are adopted, the design space of the mechanism is limited, and the movement interference of parts is difficult to process when the parts are designed.

In a mold, the mechanism design is a difficult point in the mold structure design, and the shape design of a formed part of a plastic part is greatly changed due to different shapes of the plastic part, so that in order to ensure the smooth proceeding of the automatic production of the plastic part, a mechanism for ensuring the realization of the automatic production of the plastic part needs to be designed according to a certain logic sequence under many conditions. Generally, the logic sequence of the overall structural design of the mold is as follows: firstly, the number and the positions of pouring gates in a pouring system; type selection and arrangement of corresponding forming parts; thirdly, taking measures of exhausting on the parting surface and in local areas; setting a demoulding mechanism with local characteristics of the plastic part, wherein the demoulding mechanism comprises a loose core setting at a side surface or a special position and a demoulding mode setting for finally demoulding from the core; selecting a mold frame structure required by the integral operation of the mold, wherein the mold frame structure is usually selected by the arrangement of a demolding mechanism in the mold; and sixthly, the die frame and the auxiliary mechanism of the mechanism action are arranged to meet the requirement of the automation of the die work. Under certain conditions, the structural design difficulty of the whole die depends on the design difficulty of a demoulding mechanism with special position characteristics on a plastic part, and the demoulding of the special position characteristics needs better design innovation to achieve the effects of reducing the processing difficulty of the die, improving the working reliability and service life of the die and the like, thereby achieving the purpose of reducing the production cost of the die.

This patent is to taking the difficult point of coupling end cover plastic part processing, develops a kind of taking the coupling end cover to bordure half push away a tub demoulding mechanism mould.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provides a mould for a half push pipe demoulding mechanism with a pipe joint end cover edge covering.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

a mould of a half push pipe demoulding mechanism with a pipe joint end cover edge covering comprises a movable mould plate, an upper mould base plate and a panel, wherein the upper mould base plate and the panel are arranged above the movable mould plate;

and the panel is provided with a positioning ring and a sprue bushing, the sprue bushing is communicated with the mold cavity, and the bottom of the mold cavity is correspondingly provided with an edge-covering insert ejection demolding mechanism.

Furthermore, the bottom of the movable die base plate is provided with a cushion block, the upper die base plate and the movable die plate are provided with water nozzles, the side surface of the panel is provided with a protective column, and the bottom of the cushion block is provided with a lower die base plate.

Further, a cavity insert and a core insert are arranged in the movable mold plate, the cavity insert and the core insert are installed in the movable mold plate in a shoulder mode, the insert is installed and fastened through pressing and installing of the panel and the upper mold base plate, and the core insert and the small cylindrical insert thereof are installed and fastened through pressing and installing of the movable mold plate and the movable mold base plate.

Further, the edge-covering insert ejection demolding mechanism comprises a sliding base, an edge-covering ejection insert arranged on the sliding base, and two guide pins arranged on the sliding base and in contact with the peripheral surface of the edge-covering ejection insert, wherein a guide block is arranged on the outer side of the edge-covering ejection insert, and an ejector rod is arranged on the guide block.

Further, the bottom of movable mould backing plate is equipped with eccentric clamp plate, and eccentric clamp plate's bottom is equipped with the swing arm, wears to establish the swing arm dabber on the swing arm, and the swing arm top sets up ejecting cushion.

Further, the bottom of movable mould backing plate is equipped with release link and support column, wears to establish the spring screw on first apron, the first push pedal, and secondary plate reset spring is established to the cover on the spring screw.

Furthermore, an ejector plate guide post is arranged in the die, and a secondary ejector plate guide sleeve and a primary ejector plate guide sleeve are sleeved on the ejector plate guide post.

Furthermore, a cooling water channel is arranged on the core insert.

Furthermore, in the ejection mechanism of the die, two times of ejection actions are performed, after the first ejection is completed between the first ejection plate and the second ejection plate, the second time of ejection separation actions are performed, during the actions, the eccentric pressing plate is installed below the movable die base plate through screw fastening, the swing arm is installed on the second cover plate through a swing arm core shaft, and the ejection cushion block is installed on the first push plate through screw fastening.

Further, when the ejector rod of the injection molding machine pushes the first ejector plate and the second ejector plate to be ejected upwards for a certain distance together, and the first ejection is completed, the eccentric pressing plate blocks one end of the swing arm, the first ejector plate continues to go upwards, the other end of the swing arm is in a rocker form, the ejection cushion block is jacked and the second ejector plate is pried to overcome the elastic pressure of a secondary plate reset spring to be ejected quickly, so that the ejector rod on the second ejector plate is jacked to eject the plastic part from the upper end of the edge-covered ejection insert, the first ejection is used for the side core pulling action of the edge-covered ejection insert, and the second ejection is used for the complete ejection action of the ejector rod;

when the secondary ejector plate is reset, the primary ejector plate and the secondary ejector plate need to be closed, and the closing action of the primary ejector plate and the secondary ejector plate is driven by a secondary plate reset spring.

The invention has the beneficial effects that: the mold adopts a two-plate injection mold with a special demolding mechanism to perform injection molding on a plastic part aiming at the characteristics of the overall shape of the plastic part and the characteristics of the upper pipe joint column. In the die, a twice-ejection half pipe jacking mechanism, namely a side core-pulling mechanism of a wrapping outer wall insert is arranged by combining the characteristics of an upper pipe joint column, such as the shape of a whole circle of excircle back-off and the characteristic of being positioned in a narrow area on a plastic part; in the mechanism, after a formed part on the outer wall of the pipe joint column is divided into two half jacking pipes, the two half jacking pipes are pushed out for the first time through a secondary jacking plate mechanism, and a guide block is used for driving the two half jacking pipes to move towards the side edges for loosing core, so that the left primary separation of the outer wall of the pipe joint column and the formed part is firstly realized, then the plastic part is completely pushed out from the formed part on the outer wall of the pipe joint column through the secondary forced ejection of the jacking rods, and the complete demoulding of the plastic part is; in order to realize that the two times of ejection of the ejection plate can be realized in sequence, a wane type secondary ejection separation mechanism is designed on the primary ejection plate, and the ejection height of the secondary ejection plate is flexibly adjusted. The mechanism adopts an innovative pipe jacking mechanism to solve the problem of demoulding of the whole circle of excircle back-off aiming at the structural characteristics of special characteristics on a plastic part, the design idea and the demoulding method are novel, and the mechanism has better engineering design reference significance.

Drawings

FIG. 1a is a schematic view of a molded end cap with a pipe joint made in accordance with the present invention;

FIG. 1b is a schematic cross-sectional view taken along line A-A of FIG. 1 a;

FIG. 1c is a schematic cross-sectional view taken along line B-B of FIG. 1 a;

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

FIG. 3 is a schematic layout view of the mold cavities in the mold of the present invention;

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

FIG. 5 is a schematic cross-sectional view in elevation of the present invention;

FIG. 6 is a schematic view of the working dimension setting of the mechanism of the present invention;

FIG. 7 is a schematic view of the mold core-pulling distance setting of the present invention;

FIG. 8 is a schematic view of the working principle of the mold of the present invention;

fig. 9 is a schematic structural diagram of the edge-covered insert ejection and demolding mechanism of the invention.

Detailed Description

The plastic part with the pipe joint end cover is combined with the shape characteristic of the plastic part, when the mold structure is designed, no special difficulty exists in the opening, parting setting, exhaust design and the like of a pouring system of the plastic part, and the difficulty lies in a plurality of hole sites on the upper end surface and the lower end surface of the plastic part and the demolding of the characteristics of a joint pipe column. Because the upper end and the lower end have more hole characteristics, the packing force of the formed die cavity piece after the plastic piece is formed is very large, and the die is difficult to be demolded during demolding; the joint pipe column is characterized in that an expansion chuck at the lower end of the joint pipe column forms a whole-circle annular back-off which can damage a plastic part if a forced demoulding mode is adopted, when other sliding block mechanisms are adopted, the design space of the mechanism is limited, and the movement interference of the part is difficult to process when the part is designed. For the problems in the two aspects, the following method is adopted to process the problems before the layout of the die structure is designed:

1. for the upper end face

When the holes are formed by inlaying the inserts, the draft angles in the holes are increased, generally, the draft angle of the upper end hole is larger than the draft angle of the lower end face hole by about 0.5 degrees and is set to be larger than 1.5 degrees, and the total packing force of the lower end face hole and other characteristics of the lower end face hole is larger than that of the upper end face, so that the plastic part is kept on the forming core of the lower end face by enough packing force when the mould is opened at the parting surface of the plastic part. To the lower end face

And (3) waiting for the holes, similarly arranging a forming insert for forming, wherein the drawing of the inner wall of the hole is 0.5 degrees larger than the drawing gradient of the inner wall of the plastic part, so as to facilitate the demoulding of the hole characteristics.

2. The special valve-closing type pipe jacking mechanism is adopted for forming and demoulding the joint pipe column characteristic, namely, a formed piece of the outer wall of the pipe joint column is set into a two-valve-closing type pipe jacking mechanism, and the forming and demoulding of the outer wall of the pipe joint column are realized through the side movement of the pipe jacking mechanism.

The following are the conditions of the mechanism arrangement of the plastic part and the overall structure design of the mold:

as shown in fig. 2 to 9, the mold for the ejection mechanism of the haver push tube with the pipe joint end cover edge comprises a movable mold plate 7, an upper mold plate 6 and a panel 5 which are arranged above the movable mold plate 7, wherein the top of the movable mold plate 7 is provided with four mold cavities, namely a mold cavity a1, a mold cavity a2, a mold cavity A3 and a mold cavity a 4.

The four die cavities are communicated through runners, a movable die base plate 8 is arranged at the bottom of a movable die plate 7, a first cover plate 10, a first push plate 11, a second cover plate 12 and a second push plate 13 are arranged at the bottom of the movable die base plate 8, the first cover plate 10 and the first push plate 11 are combined into a second ejector plate of the die frame, and the second cover plate 12 and the second push plate 13 are combined into a first ejector plate of the die;

and a positioning ring 3 and a sprue bushing 4 are arranged on the panel 5, the sprue bushing 4 is communicated with a mold cavity, and an edge-covering insert ejection demolding mechanism is correspondingly arranged at the bottom of the mold cavity.

The bottom of the movable die base plate 8 is provided with a cushion block 9, the upper die base plate 6 and the movable die plate 7 are provided with a water nozzle 1, the side surface of the panel 5 is provided with a protective column 2, and the bottom of the cushion block 9 is provided with a lower die base plate 14. A cavity insert 16 and a core insert 15 are arranged in the movable template 7, the cavity insert 16 and the core insert 15 are arranged in the movable template 7 in a shoulder mode, the inserts are tightly installed through the pressing installation of the panel 5 and the upper die plate 6, and the core insert 15 and the small cylindrical inserts are tightly installed through the pressing of the movable template 7 and the movable die cushion plate 8. Specifically, a screw 28 and a locking plate 29 are provided.

Further, as shown in fig. 9, the hemming insert ejection and demolding mechanism includes a slide base 36, a hemming insert 26 mounted on the slide base 36, and two guide pins 27 provided on the slide base 36 and contacting with the peripheral surface of the hemming insert 26, a guide block 30 is mounted on the outer side of the hemming insert 26, a guide groove 38 is provided on the guide block 30, a post rod 31 is mounted on the guide block 30, a plurality of small inserts 37 are provided on the top of the

hemming insert

26, and 6 small inserts 37 are provided for molding in accordance with the hole characteristics of the lower end surface of the plastic part in the demolding process of the characteristics of the lower end of the plastic part.

The bottom of movable mould backing plate 8 is equipped with eccentric clamp plate 21, and the bottom of eccentric clamp plate 21 is equipped with swing arm 22, wears to establish swing arm dabber 23 on the swing arm 22, and swing arm 22 top sets up ejecting cushion 24.

Further, the bottom of the movable die base plate 8 is provided with a reset rod 17 and a support column 20, a spring screw 19 penetrates through the first cover plate 10 and the first push plate 11, and a secondary plate reset spring 18 is sleeved on the spring screw 19.

An ejector plate guide post 32 is arranged in the mold, a secondary ejector plate guide sleeve 33 and a primary ejector plate guide sleeve 34 are sleeved on the ejector plate guide post 32, and a cooling water channel 35 is arranged on the core insert 15.

Further, in the ejection mechanism of the die, two ejection actions are performed, after the first ejection between the first ejection plate and the second ejection plate is completed, the second ejection separation action is performed, during the action, the eccentric pressing plate 21 is mounted below the movable die base plate 8 through screw fastening, the swing arm 22 is mounted on the second cover plate 12 through the swing arm mandrel 23, and the ejection cushion block 24 is mounted on the first push plate 11 through screw fastening.

When the ejector rod of the injection molding machine pushes the first ejector plate and the second ejector plate to be ejected upwards for a certain distance together, and the first ejection is completed, the eccentric pressing plate 21 blocks one end of the swing arm 22, the first ejector plate continues to go upwards, the other end of the swing arm 22 is in a rocker form, the ejection cushion block 24 is jacked and the second ejector plate is pried to overcome the elastic pressure of the secondary plate reset spring 18 to be ejected quickly, so that the ejector rod on the second ejector plate is jacked to eject a plastic part from the upper end of the edge-covered ejection insert 26, the first ejection is used for the side core pulling action of the edge-covered ejection insert 26, and the second ejection is used for the complete ejection action of the ejector rod 31;

when the ejector plate is reset, the primary ejector plate and the secondary ejector plate need to be closed, and the closing action of the primary ejector plate and the secondary ejector plate is driven by a secondary plate reset spring 18.

The advantage of adopting wane formula secondary ejection separating mechanism is convenient for adjust the ejecting height of secondary through the height of trimming eccentric clamp plate 21, perhaps adjusts the ejecting height of secondary through the ejecting distance of control injection molding machine ejector pin, and mould secondary ejection mechanism's accent mould nature is good, compares in traditional inserted bar formula secondary ejection distance control mechanism, can adjust the ejecting height of secondary ejector plate in a flexible way. The movement guide of the two ejector plates is guided by the ejector plate guide post 32, the second ejector plate guide sleeve 33 and the first ejector plate guide sleeve 34 in sliding fit.

As shown in fig. 6, the edge-covering insert ejection and demolding mechanism is provided with a half pipe jacking mechanism by means of a half slider mechanism. The edge-wrapping ejection insert 26, the second edge-wrapping ejection insert 26' are outer wall forming pieces of the whole pipe joint column, and the two forming pieces are plane-symmetric forming parts. Taking the edge-covered ejecting insert 26 as an example, in order to ensure that the edge-covered ejecting insert 26 does not block the plastic pipe joint column from being released at all when the plastic part is demoulded, the edge-covered ejecting insert 26 must move the side core (in the direction of F1) to the completely released state shown in fig. 7, fig. 6, and in fig. 7, PL-demoulding surface; p1-least waistline; p2-maximum waistline; f1-core pulling direction.

The movement distance of the edge-covering ejection insert 26 according to F1 is 4.9mm, obviously, in order to ensure the movement distance, the waist section radius of the edge-covering ejection insert 26 can only be small, which easily causes the insufficient strength of the edge-covering ejection insert 26 and is likely to break in the working process; if the distance from the edge-covering ejection insert 26 to the core-pulling direction is set to be 1.4mm (size L1), obviously, the edge-covering ejection insert 26 can ensure that most of the outer wall of the tightly covered plastic part can be effectively demoulded and separated, and only a small part of the outer wall of the plastic part is incompletely separated at the two ends, under the condition, the demoulding of the outer wall of the pipe joint column can be realized by secondary ejection forced demoulding of the ejector rod (under the condition that the forming quality of the outer wall of the pipe joint column is not influenced), the waist strength of the edge-covering ejection insert 26 can also be ensured, and meanwhile, the strength (mainly the insert wall thickness) of the formed insert between the outer wall of the pipe joint column and the inner wall of the edge of the plastic part can also be ensured, so that the design of the side core-pulling distance.

As shown in fig. 6, after the upward ejection distance of the edge-covering ejection insert 26 is 49.2mm, the upper end of the edge-covering ejection insert 26 is separated from the corresponding hole of the core insert 15, and the depth of the edge-covering ejection insert 26 in the hole of the core insert 15 is 48.9mm, i.e., L4, so that the edge-covering ejection insert 26 can be ensured to loose core outwards, and the difference between the outer wall of the waist section of the edge-covering ejection insert 26 and the corresponding inner hole of the guide block 30 and the radius of the corresponding inner hole of the core insert 30 is 2.3mm (L2), so that the edge-covering ejection insert 26 can move outwards and cannot be interfered by the inner hole of the guide block 30 and the inner hole of the core insert 15. When the edge-covering ejection insert 26 continues to be ejected upward to 53mm (L6), the fork of the guide block 30 starts to force the edge-covering ejection insert 26 to loose cores to the left side, and the side core-pulling control distance is 1.4mm (L1); the eccentric pressing plate 21 presses down the swing arm 22 to drive the secondary ejection plate to eject out, so that the ejector rod 31 is driven to eject the plastic part from the edge-covered ejection insert 26 and the second edge-covered ejection insert 26' again to realize complete demolding of the plastic part. The dimension L7 is larger than the dimension L6, so that the requirement of the side core pulling ejection stroke of the edge-covering ejection insert 26 can be completely met (L7-L6 is 19.8 mm); during the second ejection, the space where the second ejection plate can move upwards is L8-L6 which is 78mm, and is far larger than the distance L9 which is required by the ejector rod 31 for forcibly ejecting the plastic part from the edge-covered ejection insert 26 and the second edge-covered ejection insert 26', which is 8.4mm, so that the sizes L7 and L8 can meet the requirement of two ejection strokes of the mechanism.

As shown in fig. 8, the working process of the mold is as follows: firstly, the injection molding of the injection molding cavity is finished, and the mold opening is waited. And secondly, the movable die of the die retreats, after the die is opened at the PL die opening surface, the plastic part is demoulded and separated from the cavity insert under the pulling of the wrapping force of the movable die of the die, and the plastic part is left on the core insert and continuously retreats along with the movable die. And thirdly, pushing a secondary ejection plate by an ejector rod of the injection molding machine, opening the ejection plate at the surfaces of EL1 and EL2 for two times respectively, and ejecting the plastic part from the core insert 15 step by step to realize the complete demolding of the plastic part.

In the mechanism, after a formed part on the outer wall of the pipe joint column is divided into two half jacking pipes, the two half jacking pipes are pushed out for the first time through a secondary jacking plate mechanism, and a guide block is used for driving the two half jacking pipes to move towards the side edges for loosing core, so that the left primary separation of the outer wall of the pipe joint column and the formed part is firstly realized, then the plastic part is completely pushed out from the formed part on the outer wall of the pipe joint column through the secondary forced ejection of the jacking rods, and the complete demoulding of the plastic part is realized; in order to realize that the two times of ejection of the ejection plate can be realized in sequence, a wane type secondary ejection separation mechanism is designed on the primary ejection plate, and the ejection height of the secondary ejection plate is flexibly adjusted. The mechanism adopts an innovative pipe jacking mechanism to solve the problem of demoulding of the whole circle of excircle back-off aiming at the structural characteristics of special characteristics on a plastic part, the design idea and the demoulding method are novel, and the mechanism has better engineering design reference significance.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The mould comprises a movable mould plate (7), and an upper mould base plate (6) and a panel (5) which are arranged above the movable mould plate (7), and is characterized in that the top of the movable mould plate (7) is provided with four mould cavities, the four mould cavities are communicated through runners, the bottom of the movable mould plate (7) is provided with a movable mould base plate (8), the bottom of the movable mould base plate (8) is provided with a first cover plate (10), a first push plate (11), a second cover plate (12) and a second push plate (13), the first cover plate (10) and the first push plate (11) are combined into a second ejector plate of a mould frame, and the second cover plate (12) and the second push plate (13) are combined into a first ejector plate of the mould;

and a positioning ring (3) and a sprue bushing (4) are arranged on the panel (5), the sprue bushing (4) is communicated with the mold cavity, and the bottom of the mold cavity is correspondingly provided with an edge-covering insert ejection demolding mechanism.

2. The mould for the ejection mechanism of the half push pipe with the pipe joint end cover edge covering according to claim 1, wherein a cushion block (9) is arranged at the bottom of the movable mould base plate (8), water nozzles (1) are arranged on the upper mould base plate (6) and the movable mould plate (7), a protection column (2) is arranged on the side surface of the panel (5), and a lower mould base plate (14) is arranged at the bottom of the cushion block (9).

3. The mould for the demolding mechanism of the covered edge half push pipe with the pipe joint end cover is characterized in that a cavity insert (16) and a core insert (15) are arranged in the movable mould plate (7), the cavity insert (16) and the core insert (15) are installed in the movable mould plate (7) in a shoulder mode, the inserts are installed and fastened through pressing and installing of the face plate (5) and the upper mould base plate (6), and the core insert (15) and a small cylindrical insert thereof are installed and fastened through pressing and installing of the movable mould plate (7) and the movable mould base plate (8).

4. The mould for the edge-covering half push pipe demoulding mechanism of the pipe joint end cover with the pipe joint according to the claim 3, wherein the edge-covering insert ejection demoulding mechanism comprises a sliding base (36), an edge-covering insert ejection (26) arranged on the sliding base (36), two guide pins (27) arranged on the sliding base (36) and in contact with the peripheral surface of the edge-covering insert ejection (26), a guide block (30) is arranged on the outer side of the edge-covering insert ejection (26), and an ejector rod (31) is arranged on the guide block (30).

5. The mould for the demolding mechanism of the covered edge half push tube with the pipe joint end cover according to claim 4, wherein an eccentric pressing plate (21) is arranged at the bottom of the movable mould base plate (8), a swing arm (22) is arranged at the bottom of the eccentric pressing plate (21), a swing arm core shaft (23) penetrates through the swing arm (22), and an ejection cushion block (24) is arranged above the swing arm (22).

6. The mould for the demolding mechanism of the covered edge Harvard push tube with the pipe joint end cover according to claim 5, wherein a reset rod (17) and a support column (20) are arranged at the bottom of the movable mould base plate (8), a spring screw (19) penetrates through the first cover plate (10) and the first push plate (11), and a secondary plate reset spring (18) is sleeved on the spring screw (19).

7. The edge-wrapped Harvard push tube demolding mechanism mold for the end cover of the pipe joint as claimed in claim 6, wherein an ejector plate guide post (32) is arranged in the mold, and a secondary ejector plate guide sleeve (33) and a primary ejector plate guide sleeve (34) are sleeved on the ejector plate guide post (32).

8. The mould for the demolding mechanism of the pipe-sleeved edge-covered half push pipe with the pipe joint end cover according to claim 7, wherein a cooling water channel (35) is formed in the core insert (15).

9. The mould for the ejection mechanism of the covered edge half push pipe of the end cover with the pipe joint according to claim 7, wherein the ejection mechanism of the mould performs two ejection actions, the first ejection plate and the second ejection plate perform the second ejection and separation actions after the first ejection is completed, during the actions, the eccentric pressing plate (21) is tightly installed below the movable mould base plate (8) through screws, the swing arm (22) is installed on the second cover plate (12) through a swing arm mandrel (23), and the ejection cushion block (24) is tightly installed on the first push plate (11) through screws.

10. The edge-covering half push tube demolding mechanism mold with the pipe joint end cover as claimed in claim 9, wherein when an ejector rod of an injection molding machine pushes a first ejector plate and a second ejector plate to be ejected upwards for a certain distance, and the first ejection is completed, an eccentric pressing plate (21) blocks one end of a swing arm (22), the first ejector plate continues to move upwards, the other end of the swing arm (22) pushes an ejection cushion block (24) and pries the second ejector plate to overcome the elastic pressure of a secondary plate return spring (18) in a tilting plate mode to eject a plastic part rapidly, so that an ejector rod on the second ejector plate is ejected to eject the plastic part from the upper end of an edge-covering ejection insert (26), the first ejection is used for the side core pulling action of the edge-covering ejection insert (26), and the second ejection is used for the complete ejection action of the ejector rod (31);

when the ejector plate is reset, the primary ejector plate and the secondary ejector plate need to be closed, and the closing action of the primary ejector plate and the secondary ejector plate is driven by a secondary plate reset spring (18).