CN115674593A - Injection mold of piece is moulded to interior long through-hole - Google Patents

Abstract

The invention discloses an injection mold of an inner long through hole plastic part, which comprises a fixed mold component and a movable mold component, wherein the movable mold component is movably connected with the fixed mold component, the movable mold component sequentially comprises a core plate, a core component and a stripper plate in the direction close to the fixed mold component, the core component comprises a first core piece, a second core piece and a third core piece which extend longitudinally and are sequentially arranged in the direction close to the central line of a through hole, the second core piece comprises two second cores, the extending ends of the second cores extend to be abutted against the central line of the through hole to be surrounded with the third core piece for forming the inner hole wall of the inner long through hole plastic part, a first transmission mechanism is used for pushing a second transmission mechanism to move in the direction close to the fixed mold component longitudinally, and the second transmission mechanism is used for pushing the two second core pieces to gradually move towards the direction far away from the central line of the through hole in the direction close to the fixed mold component longitudinally.

Description

Injection mold of piece is moulded to interior long through-hole

Technical Field

The invention relates to the technical field of injection molding, in particular to an injection mold of a plastic part with an inner long through hole.

Background

Generally, an injection mold comprises an upper mold and a lower mold, wherein a plurality of cavities for molding products are formed at opposite ends of the lower mold and the upper mold. When a workpiece with a through hole needs to be molded, a core is often inserted into a cavity. However, an inner long through hole is formed in a part of the workpiece, please refer to fig. 1 and fig. 2. When the inner long through hole is molded by injection, the ejection and demolding movement cannot be directly carried out, the inner hole wall and the mold core can interfere, manual operation is needed, automatic demolding cannot be realized, the operation is inconvenient, and the production efficiency is reduced.

Disclosure of Invention

The invention mainly aims to provide an injection mold of a plastic part with an inner long through hole, and aims to solve the problems that the plastic part with the inner long through hole cannot be automatically demolded and the production efficiency is low.

In order to achieve the purpose, the injection mold of the plastic part with the inner long through hole provided by the invention comprises:

the fixed die assembly extends longitudinally and is used for being fixedly connected with an injection molding machine, a groove is concavely arranged on one side of the fixed die assembly in the longitudinal direction, an injection molding runner is arranged in the fixed die assembly, and the injection molding runner is communicated with the groove; and (c) a second step of,

the movable mould component is arranged along the longitudinal extension and is arranged on one side of the fixed mould component, which is provided with the groove, and is movably connected with the fixed mould component;

the core assembly comprises a first core piece, a second core piece and a third core piece which extend longitudinally and are sequentially arranged in the direction close to the center line of the through hole, one ends of the first core piece, the second core piece and the third core piece, which are close to the fixed die assembly, extend out of the through hole to be matched with the groove to define a cavity, and the cavity is used for molding the inner long through hole molding piece;

the extending ends of the first core piece and the second core piece are attached to each other, the end face of the first core piece facing the fixed die assembly is located on one side, close to the fixed die assembly, of the end face of the third core piece facing the fixed die assembly, so as to be longitudinally spaced, the extending ends of the second core piece and the third core piece are spaced from each other, the second core piece comprises two second cores arranged on two opposite sides of the third core piece, and the extending ends of the two second cores extend to be abutted to the center line direction of the through hole to be surrounded with the third core piece so as to form an inner hole wall of the inner long through hole plastic piece;

the movable mould subassembly still includes first drive mechanism and second drive mechanism, first drive mechanism is used for promoting on vertical second drive mechanism is to being close to the direction activity of cover half subassembly, second drive mechanism is used for promoting two the second type core is vertically being close to gradually towards keeping away from in the direction of cover half subassembly the direction inclined movement of the central line of via hole.

Optionally, the first transmission mechanism includes a stripper plate push plate disposed on a side of the core plate away from the fixed mold assembly, the stripper plate push plate is provided with a stripper plate push rod extending to the stripper plate along the longitudinal direction, the stripper plate push rod is movably disposed through the core plate, and the stripper plate push plate is movably disposed in the longitudinal direction to push the stripper plate;

the second transmission mechanism comprises two inclined rods, one ends of the two inclined rods are connected with the stripper plate push plate in a sliding mode in the aperture direction of the through hole, the other ends of the two inclined rods extend to the lower sides of the two second cores respectively, the two inclined rods are gradually inclined towards the direction far away from the central line of the through hole in the direction of longitudinally approaching the fixed die assembly, and the two inclined rods movably penetrate through the core plate;

and the side surface of each second core piece, which is attached to the first core piece, is gradually inclined towards the direction far away from the center line of the through hole in the direction close to the fixed die assembly.

Optionally, each of the second cores includes:

one end of the first movable core is connected with the inclined rod, the other end of the first movable core extends towards the fixed die assembly, a clamping groove penetrates through the end face, facing towards the fixed die assembly, of the first movable core, and the clamping groove is arranged in a penetrating mode in the direction close to and far away from the center line of the through hole; and the number of the first and second groups,

the second movable core is arranged in the clamping groove in a sliding mode along the direction close to and far away from the center line of the through hole, and one end, close to the fixed die assembly, of the second movable core extends towards the direction of the center line of the through hole to be abutted against the other second movable core;

wherein a side-inclined angle at which the second movable core is attached to the first core member is larger than a side-inclined angle at which the first movable core is attached to the first core member.

Optionally, the movable mold assembly further includes a third transmission mechanism, and the third transmission mechanism is configured to drive the second movable core to move towards the direction away from the center line of the via hole when the second core gradually tilts towards the direction away from the center line of the via hole in the direction longitudinally approaching the fixed mold assembly.

Optionally, the third transmission mechanism includes a dovetail groove and a dovetail bar extending in the longitudinal direction, the dovetail groove and the dovetail bar are respectively disposed on the side surfaces of the first core piece and the second movable core, which are attached to each other, and the dovetail groove and the dovetail bar can be engaged with each other and in sliding fit.

Optionally, a stop block is convexly arranged on one side of the clamping groove close to the center line direction of the through hole towards the fixed die assembly, and the stop block is arranged between the second movable core and the third core piece;

the third transmission mechanism comprises an elastic piece, the elastic piece extends along the radial direction of the through hole, one end of the elastic piece is abutted to the second movable mold core, and the other end of the elastic piece is connected with the stop block.

Optionally, one end of the second movable core, which is far away from the fixed die assembly, is provided with a sliding table in a protruding manner on the groove walls on the two sides of the clamping groove, the first movable core is correspondingly provided with a sliding way in sliding fit, and the sliding table and the sliding way are arranged along the radial extension of the through hole.

Optionally, a groove is arranged in the end surface, away from the fixed die assembly, of the second movable core in a penetrating manner, extends in the radial direction of the through hole, and is arranged in a penetrating manner on one side, away from the center line direction of the through hole;

the clamping groove is provided with a convex block facing the groove at one side far away from the direction of the central line of the through hole so as to limit the second movable core to move along the radial direction of the through hole to be separated from the first movable core.

Optionally, a sliding block is arranged at one end of each of the two inclined rods, which is close to the stripper plate push plate;

the stripper plate push plate is provided with a chute extending along the aperture of the via hole, and the chute is in sliding fit with the slider.

Optionally, a limit block is convexly arranged on one end, far away from the fixed die assembly, of the sliding block to the peripheral side;

the sliding groove and two side walls of the sliding block, which slide relatively, are provided with limiting grooves corresponding to the limiting blocks so as to limit the sliding block to move towards the fixed die assembly to be separated from the sliding groove.

In the technical scheme of the invention, one ends of the first core piece, the second core piece and the third core piece, which are close to the fixed die assembly, extend out of the through holes to be matched with the groove to define the cavity, and the cavity is used for molding the inner long through hole plastic piece. When injection molding is carried out, the injection molding machine enables injection molding liquid to enter the cavity through the injection molding runner so as to form the plastic part with the inner long through hole, and demolding is carried out after molding and cooling are finished; when the drawing of patterns is carried out, through first drive mechanism promotes on vertical the second drive mechanism is to being close to the direction activity of cover half subassembly, second drive mechanism promotes two the second refill is vertically being close to subassembly orientation is kept away from in the direction of cover half subassembly the direction inclined motion of the central line of via hole, two the second refill orientation is kept away from the direction motion of the central line of via hole is so that the orientation the one end that the central line direction of via hole extends separates relatively, follows deviate from in the interior long through-hole of interior long through-hole plastic part, accomplish the side direction of interior long through-hole is loosed core, the rethread stripper plate orientation the direction activity of cover half subassembly, in order to drive interior long through-hole plastic part and two the second refill breaks away from, accomplishes the drawing of patterns. Only need in longitudinal direction drive first drive mechanism to be close to the direction activity of cover half subassembly, through second drive assembly with the core subassembly, realize automatic drawing of patterns. The injection mold for the plastic part with the inner long through hole does not need manual mold opening and demolding of workers, and full-automatic production of the injection mold for the plastic part with the inner long through hole and automatic demolding of the plastic part with the inner long through hole is achieved. Save operating time, promoted production efficiency.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic structural view of a plastic part with an inner through hole in the background art;

FIG. 2 is a schematic cross-sectional view of the inner long through hole plastic part of FIG. 1;

FIG. 3 is a schematic structural diagram of an embodiment of an injection mold for a plastic part with an inner long through hole according to the present invention;

FIG. 4 is a schematic cross-sectional view of the movable die assembly of FIG. 1;

fig. 5 is a structural view of the second core of fig. 3.

The reference numbers indicate:

the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that all directional indicators (such as up, down, left, right, front, and back \8230;) in the embodiments of the present invention are only used to explain the relative positional relationship between the components, the motion situation, etc. in a specific posture (as shown in the attached drawings), and if the specific posture is changed, the directional indicators are changed accordingly.

In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

In general, an injection mold includes an upper mold and a lower mold, and opposite ends of the lower mold and the upper mold are provided with a plurality of cavities for molding products. When a workpiece with a through hole needs to be molded, a core is often inserted into a cavity. However, an inner long through hole is formed in a part of the workpiece, please refer to fig. 1. When the inner long through hole is molded by injection molding, the pushing and demolding movement cannot be directly carried out, the inner hole wall and the mold core can interfere, manual operation is needed, automatic demolding cannot be realized, operation is inconvenient, and production efficiency is reduced.

In view of this, fig. 3 to 5 are embodiments of the injection mold for an inner long through hole plastic part according to the present invention, which realizes automatic demolding of the inner long through hole plastic part 3 and improves the production efficiency of the inner long through hole plastic part 3.

Referring to fig. 3 to 5, the injection mold 100 of the plastic part with the inner long through hole comprises a fixed mold component 1 and a movable mold component 2, the fixed mold component 1 is arranged along the longitudinal extension and is used for being fixedly connected with an injection molding machine, the fixed mold component 1 is arranged in a longitudinal one side concave groove, an injection runner is arranged in the fixed mold component 1 and is communicated with the groove, the movable mold component 2 is arranged along the longitudinal extension and is arranged on one side of the groove arranged on the fixed mold component 1, the movable mold component 2 is movably connected with the fixed mold component 1, the movable mold component 2 sequentially comprises a core plate 21, a core component 22 and a stripper plate 23, the core component 22 and the stripper plate correspond to the groove and are arranged in the direction close to the fixed mold component 1, the stripper plate 23 is provided with a via hole 231 for the core component 22 to penetrate out, the core assembly 22 includes a first core member 221, a second core member 222, and a third core member 223 extending in a longitudinal direction and disposed in sequence in a direction approaching a center line of the via hole 231, the first core member 221, the second core member 222, and the third core member 223 protrude from the via hole 231 at an end close to the fixed mold assembly 1 to define a cavity in cooperation with the cavity, the cavity is used to mold the inner long through hole molding member 3, protruding ends of the first core member 221 and the second core member 222 abut against each other, an end surface of the first core member 221 facing the fixed mold assembly 1 is located at a side where the end surface of the third core member 223 facing the fixed mold assembly 1 approaches the fixed mold assembly 1 to be spaced apart in the longitudinal direction, the protruding ends of the second core member 222 and the third core member 223 are spaced apart from each other, the second core member 222 includes two second core 2221 disposed at opposite sides of the third core member 223, two the end that stretches out of second refill 2221 to the central line direction of via hole 231 extends to the butt, in order to enclose with third refill 223 and close and be used for the shaping interior pore wall 31 of interior long through-hole plastic part 3, movable mould subassembly 2 still includes first drive mechanism 4 and second drive mechanism 5, first drive mechanism 4 is used for promoting on vertical second drive mechanism 5 is to being close to the direction activity of cover half subassembly 1, second drive mechanism 5 is used for promoting two second refill 2221 is being close to on vertical the direction of cover half subassembly 1 gradually towards the direction tilt motion of keeping away from the central line of via hole 231.

In the technical scheme of the invention, one end of the first core piece 221, the second core piece 222 and the third core piece 223 close to the fixed die assembly 1 extends out of the through hole 231 to be matched with the type groove to define the type cavity, and the type cavity is used for forming the inner long through hole plastic piece 3. When injection molding is carried out, the injection molding machine enables injection molding liquid to enter the cavity through the injection molding runner so as to form the plastic part 3 with the inner long through hole, and demolding is carried out after molding and cooling are finished; when the drawing of patterns, through first drive mechanism 4 promotes on vertical the second drive mechanism 5 is to being close to the direction activity of cover half subassembly 1, second drive mechanism 5 promotes two second type core 2221 is vertically being close to subassembly orientation is kept away from in the direction of cover half subassembly 1 the direction inclined motion of the central line of via hole 231, two second type core 2221 is towards keeping away from the direction motion of the central line of via hole 231 so that the orientation the one end that the central line direction of via hole 231 extends separates relatively, follows deviate from in the interior long through-hole of interior long through-hole plastic part 3, accomplish the side direction of interior long through-hole is loosed core, the rethread stripper plate 23 orientation the direction activity of cover half subassembly 1, in order to drive interior long through-hole plastic part 3 and two the second type core 2221 breaks away from, accomplishes the drawing of patterns. Only the first transmission mechanism 4 is driven to move towards the direction close to the fixed die assembly 1 in the longitudinal direction, and automatic demoulding is realized through the second transmission assembly and the core assembly 22. The injection mold 100 for the plastic part with the inner long through hole does not need manual mold opening and demolding of workers, and full-automatic production of automatic demolding of the injection mold 100 for the plastic part with the inner long through hole and the plastic part 3 with the inner long through hole is achieved. Save operating time, promoted production efficiency.

In order to guarantee to mould plastics, two the mutual butt department of second type core 2221 is laminated steadily, does not influence the precision of moulding plastics, one second type core 2221's butt face is towards another second type core 2221 is equipped with locating pin 22211, another second type core 2221 corresponds and is equipped with constant head tank 22212, locating pin 22211 with constant head tank 22212 cooperates accurate location, and convenient accurate compound die improves the precision of moulding plastics.

In order to satisfy second type core piece 222 by when second drive mechanism 5 promoted, interior long through-hole mould 3 with second type core piece 222 is in step activity on vertical, in order to avoid second type core piece 222 activity is interfered interior long through-hole mould 3, first drive mechanism 4 is including locating the core plate 21 deviates from the stripper plate push plate 41 of cover half 1 one side, be equipped with on the stripper plate push plate 41 along vertically extending to the stripper plate push rod 411 of stripper plate 23, the activity of stripper plate push rod 411 is worn to establish the core plate 21, stripper plate push plate 41 is the setting of moving about on vertical, in order to promote stripper plate 23. And, in order to satisfy the requirement that when the first transmission mechanism 4 pushes the second transmission mechanism 5 to move in a direction longitudinally close to the fixed mold assembly 1, the second transmission mechanism 5 can drive the second core piece 222 to push the two second cores 2221 to gradually move in an inclined manner in a direction away from the center line of the through hole 231 in a direction longitudinally close to the fixed mold assembly 1, the second transmission mechanism 5 comprises two inclined rods 51, one end of each of the two inclined rods 51 is slidably connected with the stripper plate push plate 41 in the aperture direction of the through hole 231, the other end of each of the two inclined rods 51 extends to respectively connect the lower sides of the two second cores 2221, the two inclined rods 51 are gradually inclined in a direction away from the center line of the through hole 231 in a direction longitudinally close to the fixed mold assembly 1, and the two inclined rods 51 movably penetrate through the core plate 21; each of the second core 2221 has a side surface fitted to the first core member 221 and gradually inclines in a direction away from the center line of the through hole 231 in a direction approaching the fixed mold assembly 1. When the drawing of patterns, stripper plate push plate 41 orientation fixed mould subassembly 1 direction activity, through stripper plate push rod 411 promotes stripper plate 23 court fixed mould subassembly 1 direction activity, in order to promote interior long through-hole is moulded 3 with first type core 221 with third type core 223 separates, and simultaneously, stripper plate push plate 41 is through two the down tube 51 promotes two second type core 2221, stripper plate push plate 41 is close to on vertical fixed mould subassembly 1 activity, two the down tube 51 push rod turns to through inclination angle and promotes two second type core 2221, two the laminating of second type core 2221 the side of first type core 222221 is being close to in the direction of fixed mould subassembly 1 is towards keeping away from gradually the direction slope of the central line of via hole 231, so that two second type core 2221 can be vertically close to in the direction of fixed mould subassembly 1 gradually towards keeping away from the direction slope motion of the central line of via hole 231, because when the down tube 51 inclines to move, there will be followed the displacement of the aperture direction of via hole 231, for avoid the down tube 51 with stripper plate 41 interferes the aperture one end take place two stripper plate 231 is connected in order to avoid via hole 231.

In the structure that the two inclined rods 51 obliquely push the two second cores 2221, when the inclination angle of the two inclined rods 51 in the direction of the central line far away from the via hole 231 is too large, the inclined rods 51 are easily subjected to the reverse rotation moment effect to generate a jamming phenomenon, so that the inclination angle of the inclined rods 51 is not too large and cannot exceed 15 degrees. When the inclined rod 51 is limited in inclination angle, the second cores 2221 are separated from the inner through hole due to excessive longitudinal stroke and excessive core pulling distance, in order to reduce the longitudinal stroke of the second cores 2221, each second core 2221 includes a first movable core 22213 and a second movable core 22214, one end of the first movable core 22213 is connected to the inclined rod 51, and the other end extends toward the fixed mold component 1, a slot 222131 is formed through the end surface of the first movable core 22213 facing the fixed mold component 1, the slot 222131 is arranged in a penetrating manner in the direction close to and far from the center line of the through hole 231, the second movable core 22214 is arranged in the slot 222131 in a sliding manner in the direction close to and far from the center line of the through hole 231, one end of the second movable core 22214 close to the fixed mold component 1 extends in the direction of the center line of the through hole 231 to be abutted against the other second movable core 22214, the side inclination angle of the first movable core 22213 attached to the first core member 221 is adapted to the inclination angle of the inclined rod 51, the side inclination angle of the second movable core 22214 attached to the first core member 221 is greater than the side inclination angle of the first movable core 22213 attached to the first core member 221, and the inclination angle of the inclined rod 51 is not increased, so that the inclined rod 51 can smoothly move obliquely, and at the same time, the displacement of the first movable core 22213 and the inclined rod 51 in the aperture direction of the through hole 231 is reduced by sliding the second movable core 22214 with a greater inclination angle relative to the first movable core 22213, so that the displacement of the inclined rod 51, the first movable core 22213 and the second movable core 22214 in the longitudinal direction is reduced, and the operation stroke in a limited space is reduced.

In order to make the second movable core 22214 slide in a direction away from the center line of the through hole 231 with respect to the first movable core 22213 during the mold release, the movable mold assembly 2 further includes a third transmission mechanism 6, and the third transmission mechanism 6 is configured to drive the second movable core 22214 to move in a direction away from the center line of the through hole 231 as the second movable core 2221 is gradually tilted in a direction away from the center line of the through hole 231 in a direction longitudinally approaching the fixed mold assembly 1. In this embodiment, the third transmission mechanism 6 includes a dovetail groove 61 and a dovetail bar 62 extending in the longitudinal direction, the dovetail groove 61 and the dovetail bar 62 are respectively provided on the side surfaces where the first core member 221 and the second movable core 22214 are attached to each other, and the dovetail groove 61 and the dovetail bar 62 can be engaged with each other and slidably fitted. When the second moving core 22214 is pushed obliquely by the first core piece 221 due to the fit engagement of the dovetail groove 61 and the dovetail bar 62, the second moving core 22214 and the first core piece 221 are kept in abutment with each other, and since the side inclination angle at which the second moving core 22214 abuts against the first core piece 221 is larger than the side inclination angle at which the first moving core 22213 abuts against the first core piece 221, the second moving core 22214 is slid relative to the first moving core 22213 in a direction away from the center line of the through hole 231 to be kept in abutment with the first core piece 221, and the displacement of the second moving core 22214 in the hole diameter direction of the through hole 231 is larger than that of the first core to reduce the longitudinal stroke.

The specific arrangement of the dovetail groove 61 and the dovetail bar 62 is not limited, and in this embodiment, the dovetail groove 61 is provided on the second movable core 22214, and the dovetail bar 62 is provided on the first core member 221, but in another embodiment, the dovetail groove 61 may be provided on the first core member 221, and the dovetail bar 62 may be provided on the second movable core 22214, and is not limited.

The third transmission mechanism 6 has various types, and is not limited in particular, a stopper is convexly disposed on one side of the slot 222131 close to the center line direction of the through hole 231 toward the fixed mold assembly 1, the stopper is disposed between the second movable core 22214 and the third core piece 223, the third transmission mechanism 6 includes an elastic member 63, the elastic member 63 extends along the radial direction of the through hole 231, one end of the elastic member abuts against the second movable core 22214, and the other end of the elastic member is connected to the stopper to drive the second movable core 22214 to move in the center line direction away from the through hole 231.

In order to avoid the separation of the second movable core 22214 from the first movable core 22213 during the demolding process, the structure is separated, and the installation is required for the next use, which is troublesome. One end of the second movable core 22214, which is far away from the fixed mold component 1, is provided with a sliding table 222141 protruding from the groove walls on the two sides of the clamping groove 222131, the first movable core 22213 is correspondingly provided with a sliding fit sliding rail 222142, the sliding table 222141 and the sliding rail 222142 are arranged along the radial extension of the through hole 231, the sliding movement limits the sliding table 222141 to move towards the direction close to the fixed mold component 1 so as to limit the second movable core 22214 to move towards the direction close to the fixed mold component 1 to be separated from the first movable core 22213, and when the second movable core 22214 slides relative to the first movable core 22213, the sliding direction of the second movable core 22214 is ensured, so that the inner long through hole of the inner long through hole plastic part 3 is smoothly demolded.

Similarly, a groove is arranged through the end surface of the second movable core 22214 away from the fixed mold assembly 1, extends along the radial direction of the through hole 231 and is arranged through one side of the through hole 231 in the direction away from the center line of the through hole 231; the catching groove 222131 is provided with a protrusion toward the groove at a side away from the center line direction of the through hole 231 to limit the radial movement of the second movable core 22214 from the first movable core 22213 along the through hole 231.

It should be noted that, in the arrangement of the sliding table 222141, the sliding way 222142, the groove, and the protrusion, one of them may exist, or both of them may exist, and obviously, the technical effect brought by the simultaneous existence is the best.

In order to satisfy the requirement that one end of each of the two inclined rods 51 is slidably connected with the stripper plate push plate 41 in the aperture direction of the via hole 231, a sliding block 511 is arranged at one end of each of the two inclined rods 51 close to the stripper plate push plate 41, the stripper plate push plate 41 is provided with a sliding groove 512 extending along the aperture of the via hole 231, and the sliding groove 512 is in sliding fit with the sliding block 511. Slider 511 with the restriction is not done to the concrete structure of spout 512, for avoiding stripper plate push pedal 41 promotes the in-process of down tube 51 activity, down tube 51 breaks away from stripper plate push pedal 41 causes the drawing of patterns failure, slider 511 keeps away from the protruding stopper that is equipped with of one end to week side of cover half subassembly 1, spout 512 with the both sides wall of the relative slip of slider 511 corresponds the stopper is equipped with the spacing groove, in order to restrict the slider 511 orientation is deviate from in cover half subassembly 1 direction spout 512.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all equivalent structural changes made by using the contents of the present specification and the drawings, or any other related technical fields, which are directly or indirectly applied to the present invention, are included in the scope of the present invention.

Claims (10)

1. The utility model provides an injection mold of piece is moulded to interior long through-hole which characterized in that includes:

the fixed die assembly extends longitudinally and is used for being fixedly connected with an injection molding machine, a groove is concavely arranged on one side of the fixed die assembly in the longitudinal direction, an injection molding runner is arranged in the fixed die assembly, and the injection molding runner is communicated with the groove; and the number of the first and second groups,

the movable mould component is arranged along the longitudinal extension and is arranged on one side of the fixed mould component, which is provided with the groove, and is movably connected with the fixed mould component;

the core assembly comprises a first core piece, a second core piece and a third core piece which extend longitudinally and are sequentially arranged in the direction close to the central line of the through hole, one end of the first core piece, one end of the second core piece and one end of the third core piece, which are close to the fixed die assembly, extend out of the through hole to be matched with the groove to define a cavity, and the cavity is used for molding the inner long through hole plastic piece;

the extending ends of the first core piece and the second core piece are attached to each other, the end face of the first core piece facing the fixed die assembly is located on one side, close to the fixed die assembly, of the end face of the third core piece facing the fixed die assembly, so as to be longitudinally spaced, the extending ends of the second core piece and the third core piece are spaced from each other, the second core piece comprises two second cores arranged on two opposite sides of the third core piece, and the extending ends of the two second cores extend to be abutted to the center line direction of the through hole to be surrounded with the third core piece so as to form an inner hole wall of the inner long through hole plastic piece;

the movable mould subassembly still includes first drive mechanism and second drive mechanism, first drive mechanism is used for promoting on vertical second drive mechanism is to being close to the direction activity of cover half subassembly, second drive mechanism is used for promoting two the second type core is vertically being close to gradually towards keeping away from in the direction of cover half subassembly the direction inclined movement of the central line of via hole.

2. The injection mold for plastic parts with inner long through holes as claimed in claim 1, wherein the first transmission mechanism comprises a stripper plate push plate disposed on a side of the core plate away from the fixed mold assembly, the stripper plate push plate is provided with a stripper plate push rod extending to the stripper plate along the longitudinal direction, the stripper plate push rod movably penetrates through the core plate, and the stripper plate push plate is movably disposed along the longitudinal direction to push the stripper plate;

the second transmission mechanism comprises two inclined rods, one ends of the two inclined rods are connected with the stripper plate push plate in a sliding mode in the aperture direction of the through hole, the other ends of the two inclined rods extend to the lower sides of the two second cores respectively, the two inclined rods are gradually inclined towards the direction far away from the central line of the through hole in the direction of longitudinally approaching the fixed die assembly, and the two inclined rods movably penetrate through the core plate;

and the side surface of each second core piece, which is attached to the first core piece, is gradually inclined towards the direction far away from the center line of the through hole in the direction close to the fixed die assembly.

3. The injection mold for molding an inner long through hole according to claim 2, wherein each of the second cores comprises:

one end of the first movable core is connected with the inclined rod, the other end of the first movable core extends towards the fixed die assembly, a clamping groove penetrates through the end face, facing towards the fixed die assembly, of the first movable core, and the clamping groove is arranged in a penetrating manner in the direction close to and far away from the center line of the through hole; and (c) a second step of,

the second movable core is arranged in the clamping groove in a sliding mode along the direction close to and far away from the center line of the through hole, and one end, close to the fixed die assembly, of the second movable core extends towards the direction of the center line of the through hole to be abutted against the other second movable core;

wherein the angle of inclination of the side of the second moving core in abutment with the first core piece is greater than the angle of inclination of the side of the first moving core in abutment with the first core piece.

4. The injection mold for molding an inner long through hole as claimed in claim 3, wherein said movable mold assembly further comprises a third transmission mechanism for driving said second movable core to move in a direction away from the center line of said via hole while said second core gradually tilts in a direction away from the center line of said via hole in a direction longitudinally approaching said fixed mold assembly.

5. An injection mold for a plastic member with an inner elongated through hole according to claim 4, wherein said third transmission mechanism includes a dovetail groove and a dovetail strip extending in a longitudinal direction, said dovetail groove and said dovetail strip are respectively provided on the side surfaces where said first core member and said second movable core member are attached to each other, and said dovetail groove and said dovetail strip can be engaged with each other and slidably engaged.

6. The injection mold of the plastic part with the inner long through hole as claimed in claim 4, wherein a stop is convexly provided at one side of the clamping groove close to the center line direction of the through hole towards the fixed mold assembly, and the stop is provided between the second movable core and the third core part;

the third transmission mechanism comprises an elastic piece, the elastic piece extends along the radial direction of the through hole, one end of the elastic piece is abutted to the second movable mold core, and the other end of the elastic piece is connected with the stop block.

7. The injection mold for plastic parts with inner long through holes as claimed in claim 4, wherein a sliding table is convexly provided at one end of the second movable core far away from the fixed mold assembly to the groove walls at two sides of the clamping groove, the first movable core is correspondingly provided with a sliding way in sliding fit, and the sliding table and the sliding way are arranged along the radial extension of the through hole.

8. The injection mold for the plastic part with the inner long through hole as claimed in claim 7, wherein a groove is formed through the end face, away from the fixed mold component, of the second movable core, the groove extends in the radial direction of the through hole and is formed through one side, away from the center line direction of the through hole;

the clamping groove is provided with a convex block facing the groove at one side far away from the direction of the central line of the through hole so as to limit the second movable core to move along the radial direction of the through hole to be separated from the first movable core.

9. The injection mold for plastic parts with inner long through holes as claimed in claim 2, wherein the two diagonal rods are provided with sliding blocks at one end close to the stripper plate push plate;

the stripper plate push plate is provided with a chute extending along the aperture of the via hole, and the chute is in sliding fit with the slider.

10. The injection mold for plastic parts with inner long through holes as claimed in claim 9, wherein one end of the slide block away from the fixed mold component is convexly provided with a limit block towards the peripheral side;

the spout with the both sides wall of slider relative slip corresponds the stopper is equipped with the spacing groove, in order to restrict the slider orientation the cover half subassembly direction is deviate from the spout.

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