CN214687720U - Pen cap forming die structure - Google Patents

Abstract

The utility model discloses a pen cap forming die structure, including setting gradually: the hot runner plate is connected with at least one feeding insert; the fixed die plate is connected with at least one fixed die insert; the movable mould plate is connected with at least one movable mould insert; the face needle plate is connected with at least one core-pulling insert; the fixed die insert penetrates through the fixed die plate, one end of the fixed die insert is matched with the feeding insert, the other end of the fixed die insert is matched with the movable die insert, and at least one end of the core-pulling insert is sealed and matched with the inside of the feeding insert in an inserting manner; when the mold is closed, the feeding insert, the fixed mold insert, the movable mold insert and the core-pulling insert which are opposite in position are all surrounded to form a pen cap glue position. The utility model discloses an above-mentioned setting, the cooling shaping is moulded plastics in gluing the position after the feeding mold insert is got into from hot runner plate to the molten masterbatch, need not set up the cold runner, reduces the waste material and produces, and reduction in production cost also is applicable to the production of pen cap.

Description

Pen cap forming die structure

Technical Field

The utility model relates to a mold design technical field especially relates to a pen cap forming die structure.

Background

The pen cap is usually produced by an injection molding process, and the injection molding process can be used for rapid molding and mass production. However, in the actual pen cap production process, the plastic melt usually passes through the runner, the plastic in the runner is solidified and then is integrally formed with the pen cap, and needs to be removed, sometimes the removed runner waste material accounts for half of the product weight, and the material is seriously wasted.

In order to solve the above-mentioned problem of cold runner scrap, one conceivable way is to directly inject molten plastic into a mold through a hot runner without using a cold runner. Such as: the patent of chinese utility model with the publication number of CN212736859U discloses a mold structure without runner, which does not have a cold runner, and the plastic hot runner is directly connected to the product, thereby reducing the generation of waste material in the runner and greatly reducing the cost.

However, if the scheme is applied to the production of pen caps, a plurality of structures need to be redesigned and adjusted, and the cold-runner-free mold structure suitable for the production of the pen caps is provided based on the scheme.

SUMMERY OF THE UTILITY MODEL

The utility model provides a pen cap forming die structure, in order to adapt to the injection moulding of pen cap under the prerequisite of cancellation cold runner.

The utility model discloses a technical scheme be, a pen cap forming die structure, including setting gradually: the hot runner plate is connected with at least one feeding insert; the fixed die plate is connected with at least one fixed die insert; the movable mould plate is connected with at least one movable mould insert; the face needle plate is connected with at least one core-pulling insert; the fixed die insert penetrates through the fixed die plate, one end of the fixed die insert is matched with the feeding insert, the other end of the fixed die insert is matched with the movable die insert, and at least one end of the core-pulling insert is sealed and matched with the inside of the feeding insert in an inserting manner; when the mold is closed, the feeding insert, the fixed mold insert, the movable mold insert and the core-pulling insert which are opposite in position are all surrounded to form a pen cap glue position.

Preferably, when the mold is closed to form the glue position, the core-pulling insert is inserted into the feeding insert, the fixed mold insert is sleeved outside the feeding insert, and the movable mold insert blocks a gap between the core-pulling insert and the bottom of the fixed mold insert.

Preferably, the fixed die plate is provided with a plurality of through mounting through holes, and the fixed die inserts are detachably mounted in the mounting through holes and correspond to the feeding inserts one by one.

Preferably, the fixed mold insert is a hollow cylindrical and upper and lower opening, and a pair of flat positions for fitting is arranged on the side wall of the fixed mold insert and the side wall of the mounting through hole.

Preferably, the fixed die plate is provided with a concave fourth groove, a fixed die insert pressing plate is detachably fixed in the fourth groove, the fixed die insert pressing plate is provided with a plurality of fixed die through holes corresponding to the mounting through holes in a one-to-one manner in a run-through manner, when the fixed die insert is mounted, one end of the fixed die insert penetrates through the fixed die through hole, and the other end of the fixed die insert is inserted into the mounting through hole.

Preferably, a convex clamping ring is arranged on the outer side wall of the fixed mold insert, and the fixed mold insert pressing plate is detachably fixed in the fourth groove through a bolt and abuts against the clamping ring at the mounting through hole.

Preferably, the movable die plate is provided with a movable die through hole for installing the movable die insert, the movable die insert is annularly arranged, and the core-pulling insert is arranged in the movable die insert in a penetrating manner.

Preferably, a fifth groove is further formed in the movable mold plate, a movable mold insert pressing plate used for abutting against the movable mold insert is detachably connected to the fifth groove, and a through hole for the core-pulling insert to pass through is formed in the movable mold insert pressing plate.

Preferably, the core-pulling insert penetrates through the face pin plate, and the end part of the core-pulling insert is detachably fixed with the face pin plate through a bolt.

Preferably, the feeding insert is arranged at the bottom of the hot runner plate, the hot runner plate is further provided with a feeding assembly, the hot runner plate is further provided with a plurality of feeding through holes in one-to-one correspondence with the feeding insert, and the feeding insert is communicated with the feeding assembly through the feeding through holes.

Preferably, a second groove is formed in the hot runner plate, the feeding assembly comprises a hot nozzle insert pressing plate detachably fixed in the second groove, and a plurality of hot nozzles corresponding to the feeding through holes one to one are detachably fixed on the hot nozzle insert pressing plate.

Preferably, the feeding assembly further comprises at least one distribution box connected with the feeding inlet, each distribution box is internally provided with a plurality of pipelines, and the pipelines are multiple in number and correspond to the hot nozzles respectively and are communicated with the feeding inlet and the hot nozzles.

Preferably, each pipeline in the shunting box is provided with an electric valve, and the electric valves are used for switching the on-off of the pipelines.

Preferably, a movable mold fixing plate is further arranged on one side, away from the movable mold plate, of the face needle plate, a cold water pipe is fixedly arranged on the movable mold fixing plate in a penetrating mode, the core-pulling insert is hollow, and the cold water pipe is arranged in the core-pulling insert in a penetrating mode.

Compared with the prior art, the utility model discloses following beneficial effect has:

1. cold runners are reduced, so that the generation of runner waste is reduced, and the production cost is reduced;

2. a large-scale die does not need to be newly opened, and only the movable and fixed die inserts are replaced when the product is updated; the two inserts are small and can be directly processed on a machine tool, so that the production cost is reduced;

3. in order to prevent the cylindrical inserts from rotating to cause defects of the produced product, a flat position is added to each insert, namely the position of the insert is fixed.

4. Due to the matched arrangement of the shunting box and the plurality of hot nozzles, the group pouring of products is convenient to manage and maintain, and if a certain cavity product is abnormal in production, the group of systems can be closed without influencing the normal production of other products.

Drawings

The invention is explained in more detail below with reference to exemplary embodiments and the accompanying drawings, in which:

FIG. 1 is a cross-sectional view of a runnerless pen cap mold;

FIG. 2 is a cross-sectional view of an enlarged portion A;

FIG. 3 is an axial view of the diverter box;

FIG. 4 is an axial view of the hot nozzle;

FIG. 5 is an axial view of the pen cap product;

FIG. 6 is an axial view of the hot runner plate;

FIG. 7 is an axial view of a hot tip insert platen;

FIG. 8 is an axial view of the stationary platen;

FIG. 9 is an axial view of the stationary mold insert pin;

FIG. 10 is an axial view of a stationary mold insert platen;

FIG. 11 is an axial view of a stationary mold insert;

fig. 12 is a cross-sectional view of the needle plate;

FIG. 13 is a cross-sectional view of the moving platen;

FIG. 14 is an axial view of the movable mold insert, the movable mold insert pin and the cooling water pipe;

fig. 15 is an axial view of the cooling water pipe.

1. Fixing a die fixing plate; 2. a hot runner plate; 22. a shunt box; 23. pressing a hot nozzle insert plate; 231. a third groove; 3. fixing a template; 4. moving the template; 5. a needle board; 6. a movable mold fixing plate; 8. a hot nozzle; 10. a fixed die insert; 11. a movable mold insert; 12. pressing a movable mould insert; 13. inserting a pin into the moving die; 14. a cooling water pipe; 15. pressing plates of the fixed die inserts; 100. a pen cap product; 101. flat position.

Detailed Description

The principles and structure of this patent are explained in detail below with reference to the drawings and examples.

The utility model provides a pen cap forming die structure, including setting gradually: the hot runner plate is connected with at least one feeding insert; the fixed die plate is connected with at least one fixed die insert; the movable mould plate is connected with at least one movable mould insert; the face needle plate is connected with at least one core-pulling insert; the fixed die insert penetrates through the fixed die plate, one end of the fixed die insert is matched with the feeding insert, the other end of the fixed die insert is matched with the movable die insert, and at least one end of the core-pulling insert is sealed and matched with the inside of the feeding insert in an inserting manner; when the mold is closed, the feeding insert, the fixed mold insert, the movable mold insert and the core-pulling insert which are opposite in position are all surrounded to form a pen cap glue position.

The mould compound die forms when gluing the position, the mold insert of loosing core peg graft in inside the feeding mold insert, the cover half mold insert cover is located the feeding mold insert is outside, the movable mould mold insert will the mold insert of loosing core with the clearance shutoff between the cover half mold insert bottom.

The feeding insert is arranged at the bottom of the hot runner plate, the hot runner plate is further provided with a feeding assembly, a plurality of feeding through holes in one-to-one correspondence with the feeding insert are further formed in the hot runner plate, and the feeding insert is communicated with the feeding assembly through the feeding through holes. The hot runner plate is provided with a second groove, the feeding assembly comprises a hot nozzle insert pressing plate detachably fixed in the second groove, and a plurality of hot nozzles in one-to-one correspondence to the feeding through holes are detachably fixed on the hot nozzle insert pressing plate.

The feeding assembly further comprises at least one distribution box connected with the feeding inlet, each distribution box is internally provided with a plurality of pipelines, and the pipelines are multiple in number and correspond to the hot nozzles respectively and are communicated with the feeding inlet and the hot nozzles. And each pipeline in the shunting box is provided with an electric valve, and the electric valves are used for switching the on-off of the pipelines.

The fixed die plate is provided with a plurality of through mounting through holes, and the fixed die inserts are detachably mounted in the mounting through holes and correspond to the feeding inserts one by one. The fixed die insert is hollow and cylindrical, and is provided with an upper opening and a lower opening, and a pair of flat attaching positions is arranged on the side wall of the fixed die insert and the side wall of the mounting through hole.

The die comprises a fixed die plate, a fixed die insert and a fixed die insert, wherein the fixed die plate is provided with a concave fourth groove, a fixed die insert pressing plate is detachably fixed in the fourth groove, the fixed die insert pressing plate is provided with a plurality of fixed die through holes in one-to-one correspondence with the positions of the installation through holes in a run-through manner, when the fixed die insert is installed, one end of the fixed die insert penetrates out of the fixed die through hole, and the other end of the fixed die insert is inserted into the installation through hole.

And a convex clamping ring is arranged on the outer side wall of the fixed die insert, and the fixed die insert pressing plate is detachably fixed in the fourth groove through a bolt and abuts against the clamping ring at the mounting through hole.

The movable mould is characterized in that a movable mould through hole for installing the movable mould insert is formed in the movable mould plate, the movable mould insert is arranged in an annular mode, and the core-pulling insert is arranged in the movable mould insert in a penetrating mode. The movable mould is characterized in that a fifth groove is further formed in the movable mould plate, a movable mould insert pressing plate used for abutting against the movable mould insert is detachably connected into the fifth groove, and a through hole for the core-pulling insert to pass through is formed in the movable mould insert pressing plate.

The core-pulling insert penetrates through the face needle plate, and the end part of the core-pulling insert is detachably fixed with the face needle plate through a bolt. The movable mould is characterized in that a movable mould fixing plate is further arranged on one side, away from the movable mould plate, of the face needle plate, a cold water pipe is fixedly arranged on the movable mould fixing plate in a penetrating mode, the core-pulling insert is hollow inside, and the cold water pipe is arranged in the core-pulling insert in a penetrating mode.

Wherein, the mold insert of loosing core is the movable mould inlay needle, and the feeding entry is the extrusion mouth of pipe of melting masterbatch, and the embodiment is as follows:

the cap mould is the important device that the cap was made, but this patent provides a but quick replacement's no cold runner cap mould structure, includes: hot runner portion, stationary mold plate portion, movable mold plate portion. The hot runner part is used for transmitting and distributing plastic melt, the fixed die plate part is mainly used for glue position forming of a product main body, and the movable die plate part is used for cooling and taking out the product. The lower end face of the hot runner portion is abutted against and fixed to the upper end face of the fixed die plate portion, the upper end face of the movable die plate portion is abutted against the lower end face of the fixed die plate portion, and the movable die plate portion is movable.

Specifically, the hot runner part comprises a hot runner plate 2, a distribution box 22, a hot nozzle insert pressing plate 23 and a fixed die fixing plate 1. Wherein, the up end of hot runner plate 2 and the lower terminal surface butt of cover half fixed plate 1 and use the bolt fastening, and the lower terminal surface butt of hot runner plate 2 and the up end butt of fixed die plate 3 and use the bolt fastening.

Referring to fig. 1, the hot runner plate 2 is a rectangular thick plate, a plurality of first through elongated grooves are formed in the upper end surface of the hot runner plate 2, and the first through elongated grooves can accommodate the diversion boxes 22. A plurality of second grooves corresponding to the first grooves in position are formed in the lower end face of the hot runner plate 2, the second grooves are used for placing hot nozzle insert pressing plates 23, and the hot nozzle insert pressing plates 23 are fixed in the second grooves through bolts.

Referring to fig. 3, the diversion box 22 is long in shape, and a feeding assembly is connected to the upper end surface of the diversion box 22. The outer peripheral side of the distribution box 22 extends outward at the upper end face to form an enlarged cap with a certain thickness, the distribution boxes 22 are respectively inserted into the first grooves from the upper end face of the hot runner plate 2, and the enlarged caps are covered on the first grooves.

Referring to fig. 4-6, the bottom surface of each flow distribution box 22 is fixedly provided with a plurality of hot nozzles 8, a plurality of pipelines are arranged inside the flow distribution box 22, each pipeline is used for communicating the hot nozzles 8 with a feeding inlet, so that hot-melt raw materials enter the hot nozzles 8 respectively, and each pipeline is provided with an electric valve capable of automatically controlling the opening and closing of the pipeline, thereby controlling the on-off between each hot nozzle and the feeding inlet.

One end of the hot nozzle 8 is conical and is provided with a glue outlet, the other end of the hot nozzle is cylindrical, the side wall of the cylindrical part is provided with threads, and meanwhile, the lower end face of the shunting box 22 is also provided with a hot nozzle threaded hole. During assembly, the four hot nozzles 8 in one group are screwed into the four hot nozzle threaded holes on the lower end face of the shunting box respectively, so that the hot nozzles 8 are in threaded connection with the shunting box 22. Simultaneously, the feeding through-hole that supplies a plurality of hot mouths 8 to pass is all seted up to the bottom surface of every first recess, and during the installation, a plurality of hot mouths 8 are fixed on flow distribution box 22 after, insert the flow distribution box again in the first recess, and a plurality of hot mouths pass this through-hole and are arranged in the second recess from first recess one side respectively.

Referring to fig. 7, the hot nozzle insert pressing plate 23 is a rectangular plate, two strip-shaped third grooves 231 are formed in the upper end surface of the hot nozzle insert pressing plate 23, a plurality of through holes are formed in the bottom of each third groove 231, the inner peripheral sides of the plurality of through holes are inwardly folded to form a funnel shape, two chamfers are formed, and the tip of the hot nozzle 8 is tightly attached to the upper end surface of the through hole of the hot nozzle insert pressing plate 23.

The hot nozzle insert pressing plate 23 and the side opposite to the third groove are also integrally provided with a plurality of convex feeding inserts, the feeding inserts are arranged in a hollow opening and are in one-to-one correspondence with the positions of the through holes in the third groove, so that the molten raw material extruded from the hot nozzle 8 passes through the hot nozzle insert pressing plate 23 and then enters the feeding inserts. The feeding mold insert is used for molding the product glue position, the outer surface of the feeding mold insert is provided with anti-slip lines, and the anti-slip lines can be molded on the surface of the product, so that the pen cap has an anti-slip effect.

The upper end surface of the fixed die fixing plate 1 is provided with a feed inlet which is communicated up and down, and the plastic melt enters the feed device at the upper end of the first groove on the upper end surface of the hot runner plate 2 through the feed inlet at the top end of the fixed die fixing plate 1.

The following describes the order of mounting the components in the hot runner plate 2.

First, the hollow cylindrical portion of the hot nozzle 8 is screwed into the flow distribution box 22, the flow distribution box 22 is placed in the first groove of the hot runner plate 2, and the screw holes on the circumferential side of the flow distribution box 22 and the screw holes corresponding to the circumferential side of the hot runner plate 2 are screwed with bolts. A plurality of hot tip insert pressing plates 23 are attached to the lower end surface of the hot tip 8, and the hot tip insert pressing plates 23 and the hot runner plate 3 are fixed by bolts. The hot runner section is assembled. At this time, the first groove is covered by the amplifying cap of the shunting box 22, the second groove is completely filled by the hot nozzle insert pressing plate 23, the melted raw material enters the shunting box 22 from the feeding device after entering from the feeding hole of the fixed die fixing plate 1, and is extruded to the feeding insert through the hot nozzle 8, and the feeding insert is matched with the fixed die part and the movable die part, so that the pen cap is finally molded.

Specifically, the fixed mold part comprises a fixed mold plate 3, a fixed mold plate insert pressing plate 15 and a fixed mold insert 10. The fixed mold insert 10 is placed in the fixed mold plate 3, and the fixed mold insert pressing plate 15 is placed above the fixed mold plate 3 and used for fixing the fixed mold insert 10.

Referring to fig. 8, the fixed die plate 3 is a rectangular thick plate. Two rectangular fourth grooves are formed in the upper end face of the fixed die plate 3, and two fixed die insert pressing plates 15 can be accommodated in each fourth groove.

Referring to fig. 10, the fixed mold insert pressing plate 15 is a rectangular thick plate, and a plurality of fixed mold through holes arranged in four rows are formed in the upper end surface of each fixed mold insert pressing plate 15 and used for placing the fixed mold inserts 10. Meanwhile, a plurality of mounting through holes are also formed in the fourth groove, one end of the fixed mold insert 10 is inserted into the fixed mold through hole, and the other end of the fixed mold insert 10 is inserted into the mounting through hole of the fourth groove, so that the fixed mold insert 10 is fixed between the fixed mold insert pressing plate 15 and the fixed mold plate 3.

The upper end surface of the fixed mold insert pressing plate 15 is also provided with a threaded hole for fixing, a fixing threaded hole is also formed in the upper end surface of the fourth groove of the fixed mold plate 3, the threaded hole of the fixed mold insert pressing plate 15 is opposite to the threaded hole in the upper end surface of the fourth groove, the upper end surface of the fixed mold insert pressing plate 15 penetrates through the two through holes through bolts, and the fixed mold insert pressing plate 15 is fixed in the fourth groove of the fixed mold plate 3.

Referring to fig. 11, the fixed mold insert 10 is a hollow cylinder with upper and lower ends opened. The inner periphery of the fixed mold insert 10 serves as a product glue position, and after glue injection, anti-skid lines on the inner periphery of the fixed mold insert 10 can be formed on the surface of a product. The periphery of the fixed mold insert 10 is provided with a circle of clamping rings, the periphery of the inner periphery of the fixed mold insert through hole of the fixed mold plate 3 is also provided with a step-shaped placing ring groove, and the clamping rings of the fixed mold insert 10 are tightly propped and fixed by the lower end surface of the fixed mold insert pressing plate 15 after being placed in the placing ring groove. Meanwhile, in order to prevent the fixed mold insert 10 from rotating in the through hole of the fixed mold insert, a flat position 101 cut by a vertical section is arranged on one side of the clamping ring, and the flat position 101 cut by the vertical section is also arranged at the position where the flat position 101 of the fixed mold insert 10 is abutted to the fixed mold plate 3. The pair of attached flat positions 101 prevents the cylindrical fixed mold insert 10 from rotating in the fixed mold plate 3, and product quality can be stabilized.

The manner of assembling the mold sections is described in detail below.

And placing the fixed mold insert 10 into a fixed mold through hole of the fixed mold plate 3, and then placing the fixed mold insert pressing plate 15 into a fourth groove of the fixed mold plate 3 and fixing by using a bolt. At this time, one end of the fixed mold insert 10 is inserted into the fixed mold through hole, the other end of the fixed mold insert 10 is inserted into the installation through hole, and the fixed mold plate 3 and the fixed mold insert pressing plate 15 clamp and fix the annular part of the fixed mold insert 10, so that the assembly of the fixed mold part is completed. Moreover, because the fixed mold inserts 10 are hollow and cylindrical with two open ends, when the fixed mold part is installed below the hot runner plate 2, the fixed mold inserts 10 correspond to the feeding inserts one by one, and each fixed mold insert 10 is respectively sleeved on one feeding insert, so that a first cavity is formed between the inner side wall of the fixed mold insert 10 and the outer side wall of the feeding insert for injection molding of the pen cap part.

Further, the movable die plate portion includes a movable die plate 4, a movable die insert 11, a movable die insert pin 13, a movable die insert pressing plate 12, and a cooling water pipe 14. The movable mold insert 11 and the movable mold insert pressing plate 12 are installed inside the movable mold plate 4, the movable mold insert 13 sequentially penetrates through the movable mold insert pressing plate 12 and the movable mold plate 4 and penetrates through the movable mold insert 11, and the cooling water pipe 14 extends into the movable mold insert 13.

Referring to fig. 13, the movable mold plate 4 is a rectangular thick plate, the upper surface of the movable mold plate 4 is provided with a plurality of vertically through movable mold through holes arranged in a row, the lower end surface of the movable mold plate 4 is provided with two rectangular fifth grooves, and all the movable mold through holes are communicated with the fifth grooves corresponding to the positions. Meanwhile, a pair of attached flat positions 101 are also formed in the side walls of the movable mold through hole and the movable mold insert 11, and when the movable mold insert 11 is inserted into the movable mold through hole, the movable mold insert 11 can be prevented from rotating due to the abutting effect of the flat positions 101, so that the mounting stability is facilitated.

Referring to fig. 14, the movable mold insert 11 is annular, an inner peripheral side of the movable mold insert 11 is inwardly closed at a certain slope, and a circle of annular groove is formed at an upper end of an outer peripheral side of the movable mold insert 11; the lower peripheral side edge of the movable mold insert 11 extends outwards to form a side ring, and a part of the side ring is vertically cut off to form a flat position 101. Meanwhile, the lower end surfaces of all the movable mold through holes of the movable mold plate 4 are inwards sunken to form steps, when the movable mold insert 11 is inserted into the movable mold through holes, the circular ring part of the movable mold insert 11 is tightly abutted to the steps of the movable mold through holes, the installation and the positioning are convenient, a fifth groove formed in the movable mold plate 4 is arranged below the movable mold insert 11, and a movable mold insert pressing plate 12 is further installed and fixed in the fifth groove, so that the movable mold insert can be fixed.

The moving mold insert pressing plate 12 is a rectangular thick plate, and the moving mold insert pressing plate 12 is provided with a cylindrical insert through hole which is vertically communicated. The two movable mold insert pressing plates 12 are respectively placed in the two fifth grooves, and the lower bottom surfaces of the movable mold inserts 11 are abutted to the upper end surfaces of the movable mold insert pressing plates 12. And the movable mold insert pressing plate 12 is fixedly connected with the fifth groove of the movable mold plate 4 through a bolt.

Referring to fig. 9, the movable mold insert 13 is hollow cylindrical, and specifically, the upper peripheral side of the movable mold insert 13 forms the outer shape of the pen cap, i.e., the upper peripheral side of the movable mold insert 13 is used for molding the glue site of the product. The outer peripheral side wall of the main body of the movable mold insert 13 is obliquely arranged, and when the movable mold insert 13 is inserted into the movable mold insert 11, the oblique outer wall of the movable mold insert 13 is attached to the oblique inner peripheral side wall of the movable mold insert 11, so that the movable mold insert 13 is favorably installed and positioned, and the installation stability between the movable mold insert 13 and the movable mold insert 11 is improved. The movable mold insert 13 is hollow and closed at the top, and the bottom end of the movable mold insert 13 is open and is used for extending into the cooling water pipe 14.

Referring to fig. 12, the needle plate 5 is a rectangular thick plate, a plurality of needle plate through holes are formed on the surface of the needle plate 5, and the upper sides of the needle plate through holes close inwards to form steps with smaller diameters. The lower ends of the movable mold insert needles 13 are expanded outwards to form steps with larger diameters, when the movable mold insert needles 13 penetrate through the flour needle plate 5, the outwards expanded bottom ends of the movable mold insert needles 13 abut against the flour needle plate through holes of the inward closing-in of the flour needle plate 5, and the movable mold insert needles 13 cannot extend into the flour needle plate 5 any more.

Referring to fig. 15, the cooling water pipe 14 penetrates through the fixed mold plate 6 and extends into the inside of the movable mold insert 13, and cooling water flows in the cooling water pipe 14 to cool the movable mold insert 13. The lower end of the outer periphery of the cooling water pipe 14 is sleeved with a circular ring-shaped threaded fixing piece with threads on the outer periphery.

The movable mould fixed plate 6 is a rectangular thick plate, a plurality of cooling water pipe fixed holes are formed in the upper end face of the movable mould fixed plate 6, and meanwhile, the threaded fixing piece at the lower end of the cooling water pipe 14 is in threaded fixing with the threaded through hole in the upper end face of the movable mould fixed plate 6. Meanwhile, a plurality of cooling water pipe through holes are formed in the lower end face of the movable mold fixing plate 6, and the threaded through holes in the lower end face of the movable mold fixing plate 6 can be externally connected with water pipes.

The installation process of the movable die plate portion is described in detail below.

The bottom surface of the movable mold plate 4 is upward, the movable mold inserts 11 are sequentially installed in the movable mold plate 4, then the movable mold insert pressing plates 12 are pressed on the movable mold inserts 11, and the movable mold plate 4 and the movable mold insert pressing plates 12 are fixedly connected through bolts, so that the movable mold inserts 11 are fixed in the fixed mold plate; and then the movable die insert 13 sequentially passes through the face pin plate 5, the movable die insert pressing plate 12 and the movable die insert 11, so that the side wall of the movable die insert 13 is attached to the inner side wall of the movable die insert 11, the top end of the movable die insert 13 penetrates out of the movable die insert, and finally the cooling water pipe 14 is screwed into the movable die fixing plate 6, so that the cooling water pipe sequentially passes through the movable die fixing plate 6, the face pin plate 5 and is inserted into the movable die insert, meanwhile, the movable die fixing plate 6 also tightly supports and fixes the face pin plate 5 and the movable die insert 13, and the assembly installation of the movable die plate part is completed.

During mold closing production, as shown in fig. 1-2, the fixed mold insert 10 is sleeved outside the feeding insert and forms a first cavity, the top of the moving mold insert 13 penetrates through the fixed mold insert 10 and then is inserted into the feeding insert, so that a second cavity is formed, and the first cavity and the second cavity are communicated and form a cavity for injection molding of the pen cap.

Because the fashioned cavity of cap for brush is enclosed by a plurality of parts of feeding mold insert, cover half mold insert 10, movable mould mold insert 11 and movable mould insert 13 and establishes jointly and forms, and each part all installs in different positions department, consequently when the cap for brush updates and becomes the product of isostructure not, can be according to the position change of actual change the corresponding spare part can, no longer need change whole mould equipment, very big saving manufacturing cost. On the other hand, due to the arrangement of the shunting box 22, molten raw materials directly enter respective feeding inserts through the plurality of hot nozzles 8 when entering the mold, so that the molding chambers of each pen cap are independent from each other during feeding, if a certain pen cap is in fault during production and molding, the corresponding shunting box 22 pipeline only needs to be closed through a control valve, the influence of the whole mold when the fault occurs locally is reduced, and the improvement of the production efficiency is facilitated.

The specific production process comprises the following steps: the plastic melt enters from a feed inlet arranged on the upper end surface of the fixed die fixing plate 1 and uniformly flows into the shunting box 22, the melt enters the hot nozzle 8 from the shunting box 22 and is discharged from the hot nozzle 8 into the feeding insert on the lower end surface of the hot nozzle insert pressing plate 22, and the feeding insert of the hot nozzle insert pressing plate 22, the inner peripheral side of the fixed die insert 10, the outer peripheral side of the top of the moving die insert 13 and the upper end of the moving die insert 11 form a product glue position together. And after the melt is cooled, the movable mould part withdraws from the device and takes out the product, the product can naturally fall off from the insert pin 13 of the movable mould, and the insert pin 13 of the movable mould is inserted into the fixed mould plate 3 again, so that the production can be continued.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the invention, which is intended to cover any variations, modifications, equivalents, and improvements included within the spirit and scope of the present invention.

Claims (14)

1. The utility model provides a pen cap forming die structure which characterized in that, including setting gradually:

the hot runner plate is connected with at least one feeding insert;

the fixed die plate is connected with at least one fixed die insert;

the movable mould plate is connected with at least one movable mould insert;

the face needle plate is connected with at least one core-pulling insert;

the fixed die insert penetrates through the fixed die plate, one end of the fixed die insert is matched with the feeding insert, the other end of the fixed die insert is matched with the movable die insert, and at least one end of the core-pulling insert is sealed and matched with the inside of the feeding insert in an inserting manner;

when the mold is closed, the feeding insert, the fixed mold insert, the movable mold insert and the core-pulling insert which are opposite in position are all surrounded to form a pen cap glue position.

2. The pen cap forming mold structure according to claim 1, wherein when the mold is closed to form the glue position, the core pulling insert is inserted into the feeding insert, the fixed mold insert is sleeved outside the feeding insert, and the movable mold insert plugs a gap between the core pulling insert and the bottom of the fixed mold insert.

3. The structure of claim 2, wherein the fixed mold plate has a plurality of through-holes, and the fixed mold insert is detachably mounted in the through-holes and corresponds to the feeding inserts one by one.

4. The structure of claim 3, wherein the fixed mold insert is a hollow cylindrical and open top and bottom, and a pair of flat positions is provided at the side wall of the fixed mold insert and the side wall of the mounting through hole.

5. The pen cap forming mold structure according to claim 3, wherein the fixed mold plate is provided with a concave fourth groove, the fourth groove is detachably fixed with a fixed mold insert pressing plate, the fixed mold insert pressing plate is provided with a plurality of fixed mold through holes corresponding to the mounting through holes in a one-to-one manner, when the fixed mold insert is mounted, one end of the fixed mold insert penetrates through the fixed mold through hole, and the other end of the fixed mold insert is inserted into the mounting through hole.

6. The structure of claim 5, wherein a convex clamping ring is arranged on the outer side wall of the fixed mold insert, and the fixed mold insert pressing plate is detachably fixed in the fourth groove through a bolt and abuts against the clamping ring at the mounting through hole.

7. The pen cap molding die structure according to claim 1, wherein the movable die plate is provided with a movable die through hole for installing the movable die insert, the movable die insert is annularly arranged, and the core-pulling insert is inserted into the movable die insert.

8. The pen cap molding die structure according to claim 7, wherein a fifth groove is further formed in the movable die plate, a movable die insert pressing plate used for abutting against the movable die insert is detachably connected to the fifth groove, and a through hole for the core-pulling insert to pass through is formed in the movable die insert pressing plate.

9. The pen cap molding die structure according to claim 1, wherein the core-pulling insert passes through the face pin plate and an end portion of the core-pulling insert is detachably fixed to the face pin plate through a bolt.

10. The structure of claim 1, wherein the feeding insert is disposed at a bottom of the hot runner plate, the hot runner plate is further provided with a feeding assembly, the hot runner plate is further provided with a plurality of feeding through holes corresponding to the feeding insert in a one-to-one manner, and the feeding insert is communicated with the feeding assembly through the feeding through holes.

11. The structure of claim 10, wherein the hot runner plate defines a second groove, the feeding assembly includes a hot nozzle insert pressing plate detachably fixed in the second groove, and a plurality of hot nozzles corresponding to the feeding through holes are detachably fixed on the hot nozzle insert pressing plate.

12. The pen cap forming die structure according to claim 11, wherein the feeding assembly further comprises at least one distribution box connected to the feeding inlet, each distribution box is provided with a plurality of channels therein, and the plurality of channels correspond to the plurality of hot nozzles respectively and communicate the feeding inlet and each hot nozzle.

13. The structure of claim 12, wherein each of the conduits in the distribution box is provided with an electric valve for switching the conduits.

14. The pen cap molding die structure according to claim 1, wherein a movable die fixing plate is further arranged on one side of the face pin plate, which is far away from the movable die plate, a cold water pipe is fixedly arranged on the movable die fixing plate in a penetrating manner, the core-pulling insert is hollow, and the cold water pipe is arranged in the core-pulling insert in a penetrating manner.

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