CN218615278U - Stroke mechanism and die - Google Patents

Abstract

The application provides a stroke mechanism and mould for limiting first stroke of first template and second template split mould, the stroke mechanism includes: the opening and closing member, the blocking member and the elastic member. The opening and closing piece is detachably connected with the second template. The barrier has opposite first and second ends; the first end is connected with the opening and closing piece, and the second end corresponds to the first template along the direction of the first template and the second template which are split into two templates; the second end is provided with a limiting surface, and when the first template and the second template are assembled, a set interval is arranged between the limiting surface and the first template, and the set interval is equal to the first stroke. The elastic piece is elastically supported between the first template and the second template. The stroke mechanism and the die can divide the die opening action of the first die plate and the second die plate into at least two times of die opening, and can control the stroke of at least one time of die opening. The elastic force of the elastic piece provides the die opening force, the stroke mechanism and the die are simpler in structure, the die opening force is adjustable, and the implementation and the use are facilitated.

Description

Stroke mechanism and die

Technical Field

The application relates to the technical field of die manufacturing, in particular to a stroke mechanism and a die.

Background

An injection mold is a tool for producing plastic products, and the using method generally comprises the steps of closing the mold, injecting and molding into a cavity to form an injection molding part, and opening the mold to take out the injection molding part.

However, some injection-molded parts have a back-off structure or a rubberized structure, and the mold-ejecting direction of the back-off structure or the rubberized structure is different from the mold-opening direction of the mold. At this moment, the mould is directly opened to take out the injection molding, which easily causes the deformation of the injection molding. How to solve the above problems is considered by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

In order to solve the above technical problem, the present application provides a stroke mechanism for limiting a first stroke of the first mold plate and the second mold plate in the split mold, the stroke mechanism comprising: a shutter, a stopper and an elastic member. The shutter is detachably attached to the second die plate, and when the shutter is attached to the second die plate, a damping force capable of preventing the shutter from being detached from the second die plate exists between the shutter and the second die plate. The barrier has opposing first and second ends; the first end is connected with the opening and closing piece, and the second end corresponds to the first template along the opening direction of the first template and the second template; the second end is provided with a limiting surface, and when the first template and the second template are closed, a set interval is arranged between the limiting surface and the first template, and the set interval is equal to the first stroke. The elastic piece is elastically supported between the first template and the second template, can apply an elastic force smaller than the damping force between the first template and the second template, and is used for ejecting the first template and limiting and fitting the first template to the position of the limiting surface when the mold is opened.

Compared with the prior art, the stroke mechanism can divide the die sinking action of the first template and the second template into at least two times of die sinking, and can control the stroke of at least one time of die sinking, so that the surface of the injection molding piece is approximately attached to the die cavity and keeps the original shape when the die sinking is carried out, and at the moment, the injection molding piece can be prevented from being deformed by firstly demoulding the inverted buckle or the rubber coating structure and then demoulding and taking the injection molding piece. The elastic force of the elastic piece provides the mold opening force, the structure is simpler, the mold opening force is adjustable, and the implementation and the use are facilitated.

In a possible embodiment, a receiving groove is formed in the surface of the first mold plate close to the second mold plate, the receiving groove has a groove bottom surface, one end of the elastic member is connected to the groove bottom surface, and the other end of the elastic member is used for elastically abutting against the second mold plate.

In a possible embodiment, there are a plurality of said elastic members, and a plurality of said elastic members are distributed in a plane perpendicular to said opening direction.

In a possible embodiment, the first template is provided with a T-shaped hole extending along the die opening direction, the T-shaped hole comprises a first hole with a larger cross section and a second hole with a smaller cross section, and a first step surface connecting the surface of the first hole and the surface of the second hole is arranged between the surfaces of the first hole and the second hole. The stop piece comprises a stop block arranged at the second end and a connecting block arranged at the first end, the connecting block is connected with the stop block, and the limiting surface is arranged on one side, facing the first step surface, of the stop block and corresponds to the first step surface along the die opening direction.

In a possible embodiment, the blocking member further comprises a first connecting member, the first connecting member is connected to the connecting block and defines a movable space along the opening direction together with the connecting block, and the maximum distance of the movable space is equal to the set interval. The stop block is sleeved on the first connecting piece and can move in the moving space along the die opening direction.

In one possible embodiment, the first connecting piece is a screw having a nut and a thread, and the nut and the connecting piece define the movable space therebetween. The connecting block is provided with a screw hole, and the screw is adjustably connected to the surface of the screw hole through threads so as to adjust the distance between the movable space and the die sinking direction.

In a possible embodiment, the second mold plate is provided with a connecting groove, and the shutter is pressed against a side surface of the connecting groove when the first mold plate and the second mold plate are clamped.

In a possible embodiment, the surface of the second hole has a second step surface, and the second step surface abuts against the connecting block when the first mold plate and the second mold plate are clamped.

In one possible embodiment, the present application further provides a mold for molding a cylindrical injection molded part having opposing inner and outer surfaces. The die comprises a core pulling mechanism and a stroke mechanism. The first template and the second template define a chamber. The core-pulling mechanism is configured to be movably extended into the cavity along a direction different from the mold opening direction so as to limit a mold cavity for molding the injection molding piece in the cavity; the first die plate and the second die plate are used for limiting the outer surface of the injection molding part, and the core pulling structure is used for limiting the inner surface of the injection molding part. The core-pulling mechanism is configured to move out of the mold cavity and disengage the injection molded part after the first and second mold platens are split to a first stroke.

In a possible embodiment, the core-pulling mechanism has an undercut structure which is a protrusion protruding outward from a surface of the core-pulling mechanism in an opening direction.

Drawings

FIG. 1 is a schematic structural diagram of one embodiment of a travel mechanism of the present application;

fig. 2 and 3 are schematic structural views of the stroke mechanism of fig. 1 in different opening states;

FIG. 4 is a schematic structural view of an embodiment of the present application after the travel mechanism detailing elements;

FIG. 5 is a schematic structural view of another embodiment of the travel mechanism of FIG. 4;

FIG. 6 is a schematic three-dimensional structure of one embodiment of a mold of the present application;

fig. 7 is a schematic view of a part of the structure of the mold of fig. 6.

Description of the main elements

Stroke mechanism 1

First template 11

Accommodating groove 111

Groove bottom surface 112

T-shaped hole 113

First hole 114

Second hole 115

First step surface 116

Second step surface 117

Second template 12

Connecting groove 121

Opening and closing member 13

Nylon switch 131

Nylon sleeve 132

Second connecting member 133

Side surface 134

Barrier 14

First end 141

Second end 142

Limiting surface 143

Connecting block 145

First connector 146

Nut 1461

Screw 1462

Threads 1463

Stop 147

Attachment hole 1471

Elastic member 15

Spring 151

Base 152

Bolt 153

Through-hole 154

First stroke H1

Second stroke H2

Set interval H3

Activity space H4

Mold 2

Core-pulling mechanism 21

Die cavity 22

Back-off structure 23

Injection molded part 24

Chamber 25

Outer surface 26

Inner surface 27

The following detailed description will further illustrate the present application in conjunction with the above-described figures.

Detailed Description

The following description will refer to the accompanying drawings to more fully describe the present disclosure. There is shown in the drawings exemplary embodiments of the present application. This application may, however, be embodied in many different forms and should not be construed as limited to the exemplary embodiments set forth herein. These exemplary embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. Like reference numerals designate identical or similar components.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. Furthermore, unless otherwise defined herein, terms such as those defined in commonly used dictionaries should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and this application and will not be interpreted in an idealized or overly formal sense.

The following description of exemplary embodiments refers to the accompanying drawings. It should be noted that the components depicted in the referenced drawings are not necessarily shown to scale; and the same or similar components will be given the same or similar reference numerals or similar terms.

Embodiments of the present application will now be described in further detail with reference to the accompanying drawings.

Referring to fig. 1 and 2, the present application provides a stroke mechanism 1, which can divide the mold opening operation of a first mold plate 11 and a second mold plate 12 into two mold openings and control a first stroke (a first stroke H1) of the two mold openings. The stroke mechanism 1 includes an opening/closing member 13, a stopper member 14, and an elastic member 15. The shutter 13 is detachably connected to the second die plate 12, and when the shutter 13 is connected to the second die plate 12, a damping force capable of preventing the shutter 13 from being separated from the second die plate 12 exists between the shutter 13 and the second die plate 12. Barrier 14 has opposing first and second ends 141 and 142; the first end 141 is connected with the opening and closing member 13, and the second end 142 corresponds to the first template 11 along the opening direction of the first template 11 and the second template 12; the second end 142 has a limiting surface 143, and when the first mold plate 11 and the second mold plate 12 are clamped, a set interval H3 is provided between the limiting surface 143 and the first mold plate 11, and the set interval H3 is equal to the first stroke H1. The elastic element 15 is elastically supported between the first template 11 and the second template 12, and can apply an elastic force smaller than the damping force between the first template 11 and the second template 12, so as to push the first template 11 open and limit the position of the limit surface 143 during mold opening.

In the present embodiment, the shutter 13 may be a resin shutter or a spring shutter, and preferably, the present application uses a resin shutter, and the shutter 13 is used to increase the mold opening resistance between the first mold plate 11 and the second mold plate 12. The first template 11 is firstly opened to the first stroke H1 under the elastic force action of the elastic element 15, the elastic element 15 is simpler than the driving structures of an oil cylinder or a motor and the like in the prior art, and the magnitude of the elastic force is controlled by the compression amount of the elastic element 15, so that the opening force is conveniently adjusted. When the mold is opened to the first stroke H1, the limiting surface 143 contacts the first mold plate 11 and plays a role in limiting the mold opening of the first mold plate 11 and the second mold plate 12 to the first stroke H1. The first stroke H1 may be set as desired, for example, to 0.1-0.5mm. When the first stroke H1 is small (e.g., less than 0.5 mm), the control accuracy of the mold opening structure of the prior art is difficult to achieve (e.g., the control accuracy of mold opening and closing of a general molding machine can only reach 2-3 mm) or the cost is too high. By adopting the scheme of the embodiment of the application, the stroke control can be realized at low cost, and the control precision is high. The elastic force is transmitted to the blocking member 14 through the first template 11 and then to the shutter 13 through the blocking member 14, and the shutter 13 is still coupled to the second template 12 because the elastic force is not enough to separate the shutter 13 from the second template 12.

Referring to fig. 3, the first mold plate 11 is opened to a second stroke H2 by an external force, and the second stroke H2 is greater than the first stroke H1. By applying the mold opening force to the first mold plate 11, the first mold plate 11 drives the blocking member 14 to move, and the blocking member 14 drives the opening and closing member 13 to separate from the second mold plate 12, so that the first mold plate 11 and the second mold plate 12 are completely opened.

In an embodiment, the surface of the first mold plate 11 close to the second mold plate 12 is provided with a receiving groove 111, the receiving groove 111 has a groove bottom surface 112, one end of the elastic element 15 is connected to the groove bottom surface 112, and the other end is used for elastically abutting against the second mold plate 12.

In one embodiment, there are multiple elastic members 15, and the multiple elastic members 15 are distributed in a plane perpendicular to the mold opening direction.

Further, a plurality of elastic members 15 may be provided, and the resultant force of the plurality of elastic members 15 abuts against the second mold plate 12 so as to open the first mold plate 11 and the second mold plate 12 to the first stroke H1. The resultant force of the plurality of elastic members 15 is not greater than the damping force between the shutter 13 and the second template 12. Depending on the environment in which the stroke mechanism 1 is used, a plurality of shutters 13 may be provided, and the opening force of the stroke mechanism 1 may be balanced by adjusting the positions of the shutters 13, so that the first die plate 11 and the second die plate 12 are stably opened to the first stroke H1. According to the number and the position of the opening and closing pieces 13, the elastic pieces 15 and the opening and closing pieces 13 are arranged at intervals and flexibly placed under the condition that the elastic force is not larger than the damping force.

In the present embodiment, the elastic member 15 includes a spring 151, a base 152, and a bolt 153. The receiving groove 111 has a bottom surface 112, and the receiving groove 111 is used for placing the elastic member 15. One end of the spring 151 is connected to the base 152, the base 152 is placed on the slot bottom 112, and the other end of the spring 151 extends toward the second form 12. In a state where the first template 11 is fully opened, the spring 151 is in a natural relaxation state where the length of the spring 151 exceeds the length of the receiving groove 111. The base 152 is formed with a through hole 154, and the bolt 153 passes through the through hole 154 to fix the base 152 to the first template 11, so that the spring 151 can repeatedly make a telescopic motion on the surface of the receiving groove 111. It can be understood that, in the closed state of the first mold plate 11 and the second mold plate 12, the spring 151 is compressed into the receiving groove 111 to store the elastic force for the next opening of the stroke mechanism 1.

Referring to fig. 4, the structure of the blocking member 14 and the opening/closing member 13 in the stroke mechanism 1 is further designed, in an embodiment, the first mold plate 11 is provided with a T-shaped hole 113 extending along the mold opening direction, the T-shaped hole 113 includes a first hole 114 with a larger cross section and a second hole 115 with a smaller cross section, and a first step surface 116 is disposed between the surface of the first hole 114 and the surface of the second hole 115.

The blocking member 14 includes a stop block 147 disposed at the second end 142 and a connecting block 145 disposed at the first end 141, the connecting block 145 is connected to the stop block 147, and the limiting surface 143 is disposed on a side of the stop block 147 facing the first step surface 116 and corresponds to the first step surface 116 along the mold opening direction.

In an embodiment, the blocking member 14 further includes a first connecting member 146, the first connecting member 146 is connected to the connecting member 145 and defines a moving space H4 along the opening direction together with the connecting member 145, and a maximum distance of the moving space H4 is equal to the set interval H3.

The stopper 147 is sleeved on the first connecting member 146 and can move in the moving space H4 in the mold opening direction.

In one embodiment, first connector 146 is a screw having a nut 1461 and threads 1463, and a movable space H4 is defined between nut 1461 and connecting block 145.

The connecting block 145 is provided with a screw hole, and a screw is adjustably connected to the surface of the screw hole through a thread 1463 to adjust the distance between the movable space H4 in the mold opening direction.

Further, the first connecting piece 146 is provided with threads 1463, the first connecting piece 146 is connected with the connecting block 145 through the threads 1463, and the matching depth of the threads 1463 and the screw holes is adjusted by rotating the first connecting piece 146, so that the distance between the first step surface 116 and the moving space H4 of the limiting surface 143 is accurately adjusted, and the first stroke H1 of the stroke mechanism 1 is further adjusted.

In this embodiment, the blocking member 14 further includes a connection block 145, a stop block 147 and a first connection member 146, and the first mold plate 11 is provided with a T-shaped hole 113 extending along the mold opening direction. The blocking member 14 is disposed in cooperation with the surface of the T-shaped hole 113. During the process of opening the first template 11 and the second template 12 to the first stroke H1 under the elastic force of the elastic member 15, the surface of the T-shaped hole 113 slides relative to the blocking member 14, and the blocking member 14 is connected with the second template 12 through the opening and closing member 13. When the first step surface 116 comes into contact with the stopper surface 143, the damping force of the shutter 13 is transmitted to the first die plate 11 through the stopper 147. The first connecting member 146 includes a nut 1461 and a screw 1462, the block 147 has a connecting hole 1471, and the block 147 is sleeved on the screw 1462 through the connecting hole 1471 and can move relative to the screw 1462. Part of the axial surface of the screw 1462 is provided with a thread 1463, and the depth of the thread 1463 of the screw 1462 connected to the connecting block 145 is adjusted to adjust the moving space H4 of the first step surface 116 and the limiting surface 143, thereby adjusting the distance of the first stroke H1. The movable space H4 can be changed by increasing or decreasing the material thickness of the first step surface 116, or the movable space H4 can be changed by increasing or decreasing the length of the first connecting member 146, which is not limited in the present application. During the process of opening the first mold plate 11 and the second mold plate 12 by the second stroke H2, the nut 1461 is used to abut against the stopper 147, and the first mold plate 11 transmits the opening force to the first connecting member 146 by abutting against the stopper 147. The mold opening force is further transmitted to the connecting blocks 145 through the first connecting blocks 146, and finally the mold opening force is transmitted to the shutter 13 through the connecting blocks 145, so that the shutter 13 is separated from the second mold plate 12, and the first mold plate 11 and the second mold plate 12 are completely opened.

In one embodiment, the second mold plate 12 is provided with a connecting groove 121, and the shutter 13 is pressed against a side surface 134 of the connecting groove 121 when the first mold plate 11 and the second mold plate 12 are clamped.

Further, the shutter 13 generates a frictional force between the side surface 134 of the shutter 13 and the surface of the coupling groove 121 by interference-fitting with the second mold plate 12, and the frictional force provides a damping force. And the larger the interference fit amount of the surface of the opening and closing member 13 with the connecting groove 121 is, the larger the damping force provided by the opening and closing member 13 is, and conversely, the smaller the damping force is.

In the present embodiment, the shutter 13 includes a nylon shutter 131, and the nylon shutter 131 includes a nylon sleeve 132 and a second connecting member 133. The nylon cover 132 is substantially shaped as a hollow cylinder, the second connecting member 133 may be a tapered screw, and the second connecting member 133 passes through the hollow shutter 13 to be connected to the connecting block 145. The second mold plate 12 is provided with a coupling groove 121, and the second connecting member 133 expands the nylon sleeve 132, so that the nylon sleeve 132 is interference-fitted with a surface of the coupling groove 121 to provide a damping force. And the interference fit amount of the nylon sleeve 132 and the surface of the connection groove 121 is adjusted by the locking depth of the taper screw, so that the frictional force between the second template 12 and the nylon sleeve 132 is adjusted to change the damping force.

In one embodiment, the surface of the second hole 115 has a second step surface 117, and when the first mold plate 11 and the second mold plate 12 are clamped, the second step surface 117 abuts against the connecting block 145.

Further, when the first mold plate 11 and the second mold plate 12 are clamped, the first mold plate 11 abuts against the connecting block 145 through the second step surface 117 to move the connecting block 145 toward the second mold plate 12, and the connecting block 145 transmits the clamping force of the first mold plate 11 to the shutter 13 to press the shutter 13 against the connecting groove 121, so that the shutter 13 repeatedly provides the damping force.

In this embodiment, the second hole 115 has a second step surface 117 at an end thereof adjacent to the second template 12, and the connector block 145 has opposite large and small ends, and the connector block 145 penetrates the first template 11 from the second hole 115. When the stroke mechanism 1 opens the die, the first die plate 11 opens the die to the first stroke H1, and the connecting block 145 slides relative to the first die plate 11 under the damping force of the opening and closing member 13 until the limiting surface 143 abuts against the first die plate 11 and stops sliding relative to the first die plate. When the stroke mechanism 1 is clamped, the first mold plate 11 abuts against the connecting block 145 through the second step surface 117, so that the opening and closing member 13 moves toward the second mold plate 12 and presses the connecting groove 121, and the opening and closing member 13 is in interference fit with the second mold plate 12.

Referring to fig. 5, the elastic element 15 and the opening/closing element 13 in the stroke mechanism 1 may also have other matching manners, and in an embodiment, the elastic element 15 is connected to the second step surface 117 and penetrates through the connecting block 145.

Further, two arrangements of the elastic member 15 are provided, which is beneficial to adjusting the use mode of the stroke mechanism 1 according to a specific use scene. The elastic member 15 and the opening and closing member 13 are arranged at intervals, so that the elastic member 15 and the opening and closing member 13 are not interfered with each other, and the elastic member 15 can be flexibly adjusted and independently replaced conveniently. The elastic member 15 penetrates through the blocking member 14, so that the stroke mechanism 1 is more compact in structure, and the size of the occupied space of the stroke mechanism 1 is reduced.

In this embodiment, the inner diameter of the elastic member 15 is larger than the outer diameter of the connection block 145, the elastic member 15 is disposed at a position of the second hole 115 near the second template 12, one end of the elastic member 15 is connected to the second step surface 117, and the other end of the elastic member 15 extends toward the second template 12. The elastic piece 15 is sleeved on the surface of the connecting block 145, and the elastic force of the elastic piece 15 is along the axial direction of the connecting block 145, so that the direction of the elastic force acting on the first template 11 is consistent with the sliding direction of the connecting block 145, and the sliding stability of the connecting block 145 relative to the first template 11 is improved. Therefore, under the condition that the first template 11 is stably opened to the first stroke H1, the size of the occupied space of the stroke mechanism 1 is reduced.

Referring to fig. 6 and 7, the stroke mechanism 1 may be used in an injection mold 2, and in one embodiment, the present application further provides a mold 2 for molding a cylindrical injection-molded part 24, wherein the injection-molded part 24 has an inner surface 27 and an outer surface 26 opposite to each other. The mold 2 includes a core-pulling mechanism 21 and a stroke mechanism 1. First template 11 and second template 12 define a chamber 25. The core-pulling mechanism 21 is configured to be movable into the cavity 25 in a direction different from the mold-opening direction to define a mold cavity 22 in the cavity 25 in which the injection-molded part 24 is molded. The first mold plate 11 and the second mold plate 12 are used for defining an outer surface 26 of the injection molded part 24, and the core-pulling structure is used for defining an inner surface 27 of the injection molded part 24. The core-pulling mechanism 21 is configured to move out of the mold cavity 22 and disengage the injection molded part 24 after the first mold plate 11 and the second mold plate 12 are split to the first stroke H1.

In one embodiment, the core-pulling mechanism 21 has an inverted structure 23, and the inverted structure 23 is a protrusion protruding outward from the surface of the core-pulling mechanism 21 along the mold-opening direction. Such as an undercut 23 protruding towards the first template 11 or the second template 12.

In the present embodiment, the mold 2 is first opened to the first stroke H1 by the stroke mechanism 1, and the injection molded part 24 is still fixed between the first mold plate 11 and the second mold plate 12, and since the first mold plate 11 and the second mold plate 12 are opened to the first stroke H1, the core-pulling mechanism 21 is beneficial to reducing the deformation of the injection molded part 24 caused by the core-pulling mechanism 21 when the injection molded part 24 is pulled out. After the core-pulling mechanism 21 pulls out the injection molding piece 24, the mold 2 is opened again to a second stroke H2 through the stroke mechanism 1, at the moment, the mold 2 is opened, and the injection molding piece 24 is taken out of the mold 2. This enables injection molding and demolding of the injection-molded part 24 in the mold 2 with a plurality of demolding directions.

Specifically, the working principle of the mold 2 is further described by taking the core-pulling mechanism 21 and the injection-molded part 24 as an example. The injection molding 24 has a plurality of different mold stripping directions, and under the condition that the mold 2 already determines the main mold stripping direction and uses a slide block or a core-pulling mechanism 21 and the like to assist mold stripping in other directions, the reverse buckling structure 23 still exists in the local area of the core-pulling mechanism 21 for molding the injection molding 24. The undercut structure 23 is a protrusion protruding outward from the surface of the core pulling mechanism 21 in the mold opening direction, for example, the undercut structure 23 protrudes toward the first mold plate 11 (or the second mold plate 12). This part of the undercut 23 requires forced demolding in order to complete demolding of the injection-molded part 24. During forced demoulding, the interference distance between the inverted structure 23 and the injection-molded part 24 is assumed to be 0.1mm, and the inverted structure 23 can enlarge the shape of the injection-molded part 24 by 0.1mm. The mold 2 is opened by 0.1mm through the stroke mechanism 1, then the core-pulling mechanism 21 is pulled out of the injection molding piece 24, and the injection molding piece 24 is still kept in the mold 2 at the moment, so that the injection molding piece 24 is beneficial to being restored to the original state in the mold 2 after being deformed. The mold 2 can be adapted to mold more products by adjusting the first stroke H1 of the stroke mechanism 1, for example, to 0.15mm or 0.2mm, etc., through the mutual cooperation of the elastic member 15, the blocking member 14 and the opening and closing member 13 according to the back-off amount of the core-pulling mechanism 21 and the injection molded part 24.

Hereinbefore, specific embodiments of the present application are described with reference to the drawings. However, those skilled in the art will appreciate that various modifications and substitutions can be made to the specific embodiments of the present application without departing from the spirit and scope of the application. Such modifications and substitutions are intended to be within the scope of the present application.

Claims (10)

1. A stroke mechanism for defining a first stroke of a split mold of a first mold platen and a second mold platen, the stroke mechanism comprising:

an opening/closing member detachably connected to the second die plate, wherein a damping force capable of preventing the opening/closing member from being separated from the second die plate is present between the opening/closing member and the second die plate when the opening/closing member is connected to the second die plate;

a barrier having opposing first and second ends; the first end is connected with the opening and closing piece, and the second end corresponds to the first template along the opening direction of the first template and the second template; the second end is provided with a limiting surface, and when the first template and the second template are matched, a set interval is formed between the limiting surface and the first template, and the set interval is equal to the first stroke; and

the elastic piece is elastically supported between the first template and the second template, can apply an elastic force smaller than the damping force between the first template and the second template, and is used for ejecting the first template and limiting and fitting the first template to the position of the limiting surface when the mold is opened.

2. The stroke mechanism as recited in claim 1 wherein:

the surface of the first template, which is close to the second template, is provided with a containing groove, the containing groove is provided with a groove bottom surface, one end of the elastic piece is connected with the groove bottom surface, and the other end of the elastic piece is used for elastically propping against the second template.

3. The stroke mechanism as recited in claim 1 wherein:

the elastic pieces are distributed in a surface perpendicular to the die opening direction.

4. The stroke mechanism as recited in claim 1 wherein:

the first template is provided with a T-shaped hole extending along the die opening direction, the T-shaped hole comprises a first hole with a larger section and a second hole with a smaller section, and a first step surface for connecting the surface of the first hole and the surface of the second hole is arranged between the surface of the first hole and the surface of the second hole;

the stop piece comprises a stop block arranged at the second end and a connecting block arranged at the first end, the connecting block is connected with the stop block, and the limiting surface is arranged on one side, facing the first step surface, of the stop block and corresponds to the first step surface along the die opening direction.

5. The stroke mechanism as recited in claim 4 wherein:

the blocking piece further comprises a first connecting piece, the first connecting piece is connected to the connecting block and defines a movable space along the die opening direction together with the connecting block, and the maximum distance of the movable space is equal to the set interval;

the stop block is sleeved on the first connecting piece and can move in the moving space along the die opening direction.

6. The stroke mechanism as recited in claim 5 wherein:

the first connecting piece is a screw, the screw is provided with a screw cap and a thread, and the movable space is defined between the screw cap and the connecting piece;

the connecting block is provided with a screw hole, and the screw is adjustably connected to the surface of the screw hole through threads so as to adjust the distance between the movable space and the die sinking direction.

7. The stroke mechanism as recited in claim 1 wherein:

the second template is provided with a connecting groove, and when the first template and the second template are assembled, the opening and closing piece is pressed against the side surface of the connecting groove.

8. The stroke mechanism as recited in claim 4 wherein:

the surface of the second hole is provided with a second step surface, and the second step surface is propped against the connecting block when the first template and the second template are assembled.

9. A mold for forming a tubular injection molded part having opposing inner and outer surfaces, said mold comprising:

the mold comprising a core-pulling mechanism and the stroke mechanism of any one of claims 1 to 8;

the first and second templates defining a chamber;

the core-pulling mechanism is configured to be movably extended into the cavity along a direction different from the mold opening direction so as to limit a mold cavity for molding the injection molding piece in the cavity; wherein the first and second mold plates are configured to define an outer surface of the injection molded part and the core-pulling mechanism is configured to define an inner surface of the injection molded part;

the core-pulling mechanism is configured to move out of the mold cavity and disengage the injection molded part after the first and second mold platens are split to a first stroke.

10. The mold of claim 9, wherein:

the core pulling mechanism is provided with an inverted buckle structure, and the inverted buckle structure is a bulge which protrudes outwards from the surface of the core pulling mechanism along the die opening direction.

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