CN111703034B

CN111703034B - Precision mold for plastic product processing

Info

Publication number: CN111703034B
Application number: CN202010624416.6A
Authority: CN
Inventors: 禹海平; 赵丹; 姜云
Original assignee: Guangzhou Modao Plastic Products Co ltd
Current assignee: GUANGZHOU MODAO PLASTIC PRODUCTS Co.,Ltd.
Priority date: 2020-06-30
Filing date: 2020-06-30
Publication date: 2021-07-02
Anticipated expiration: 2040-06-30
Also published as: CN111703034A

Abstract

The invention relates to the technical field of plastic processing equipment, and discloses a precision die for processing plastic products, which comprises a movable die holder and a static die holder, wherein the middle part of the bottom surface of the movable die holder is provided with a movable die core, the middle part of the top surface of the static die holder is provided with a static die core, four guide posts are movably sleeved in the static die holder in a rectangular shape, the outer rings of the guide posts are movably sleeved with protective springs, the middle part of the movable die holder is provided with a penetrating injection molding hole, the inside of the injection molding hole is movably sleeved with a movable plunger, the top of the movable die holder is provided with a guide sleeve matched with the guide posts, the inside of the bottom of the static die holder is movably sleeved with a push rod, the outer rings of the push rods are movably sleeved with return springs, the inside of the guide sleeve is movably sleeved with a press block, one end of the guide sleeve, which is positioned in the movable die holder, the die is high in precision and machining efficiency.

Description

Precision mold for plastic product processing

Technical Field

The invention relates to the technical field of plastic processing equipment, in particular to a precision mold for processing a plastic product.

Background

Plastic products are applied to the modern society particularly, various plastic products enter our lives, but the plastic products have low hardness and rigidity, so that the quality of the plastic products is guaranteed during production, the plastic products are produced by injection molding, namely, an injection molding machine is used for injecting molten plastic into a mold, and after the molten plastic is cooled and solidified, the plastic products are taken out for repairing burrs and the like, but the existing plastic product processing mold has some defects:

1. the injection molding method comprises the following steps that molten plastic is injected through an injection molding hole during injection molding, the plastic is accumulated when a cavity in a mold is filled with the plastic, the injection molding is stopped when the space in the cavity is filled with the injection molding, only temporary filling of the cavity is ensured at the moment, but the plastic is cooled actually, the volume is reduced, the density of the filled plastic is low, the plastic quantity and the plastic density which meet the qualified requirements cannot be achieved, and therefore the qualified degree of a manufactured plastic product cannot be ensured;

2. the injection molding is carried out through the injection molding hole, the plastic in the injection molding hole is solidified after the injection molding is finished, the section of plastic formed in the injection molding hole needs to be cut off subsequently, the subsequent cutting off is not only time-wasting, but also can not ensure that the cutting off is accurate to a certain extent, meanwhile, the waste of the plastic can be caused, and the production efficiency is not high.

Disclosure of Invention

Aiming at the defects of the background technology, the invention provides the precision mould for processing the plastic product, which has the advantages of high forming precision and high efficiency and solves the problems in the background technology.

The invention provides the following technical scheme: a precision die for processing plastic products comprises a movable die holder and a static die holder, wherein a movable die core is arranged in the middle of the bottom surface of the movable die holder, a static die core is arranged in the middle of the top surface of the static die holder, four guide posts are movably sleeved in the static die holder in a rectangular shape, a protection spring is movably sleeved on the outer rings of the guide posts, a penetrating injection molding hole is formed in the middle of the movable die holder, a movable plunger is movably sleeved in the injection molding hole, a guide sleeve matched with the guide posts is arranged at the top of the movable die holder, a push rod is movably sleeved in the bottom of the static die holder, a reset spring is movably sleeved on the outer ring of the push rod, a press block is movably sleeved in the guide sleeve, one end of the guide sleeve, which is positioned in the movable die holder, is communicated with a pressure chamber, a pressure block is movably sleeved at the bottom of the pressure chamber, and a cavity is formed in the movable, the utility model discloses a portable electronic device, including injection molding hole, pressure piece, stay cord, fixed pulley, movable plunger, movable die holder, recess, the top fixedly connected with slide bar that the pressure piece is close to injection molding hole one end, the top fixedly connected with stay cord of slide bar, the top of slide bar is run through to the cavity indoor portion, the bottom fixed mounting of cavity indoor has the fixed pulley, the stay cord is close to the one end fixedly connected with lug in injection molding hole, the lug is the semicircle form, the stay cord cup joints with the outer lane activity of fixed pulley, the lug activity cup joints the one side at movable plunger, the inside position of cup jointing the lug of movable plunger has seted up spacing spout, the movable die holder is seted up the.

Preferably, the bottom surface of the guide column is not contacted with the inside of the static die holder when the die is not clamped.

Preferably, the pressure block and the guide sleeve are sealed, and the pressure block and the pressure chamber are sealed.

Preferably, the pull rope is completely straightened and is completely positioned in the hollow chamber when the slide rod reaches the highest position.

Preferably, the pull rope is made of a high-toughness high-temperature-resistant polybenzimidazole material.

Preferably, when the projection slides to the innermost part of the movable plunger, the width between the two ends of the projection is larger than the distance between the bottoms of the two grooves formed in the inner surface of the movable mold base.

Preferably, the pressure chamber is filled with a fluorocarbon inert liquid.

The invention has the following beneficial effects:

1. through inside intercommunication pressure chamber with the uide bushing, and the briquetting has been cup jointed in the uide bushing activity, the pressure piece has been cup jointed in the bottom activity of pressure chamber, compare in prior art, can support the pressure piece through the pressure chamber that sets up when moving die holder and quiet die holder cooperation, thereby transmit pressure to the pressure piece on through the pressure chamber, make the downward roll-off of pressure piece contact with the inside molten state plastics of die cavity, and this pressure is the same with the pressure that the mould cavity was filled to the full mould cavity wall of assurance product when qualified, guarantee that the plastics of die cavity are filled when returning the pressure piece original position again and reached qualified requirement, and through the slide bar, stay cord etc. with movable plunger and the laminating of injection molding hole not moulding plastics, wait to obtain the high accuracy plastics product that accords with the standard after cooling.

2. Through setting up pressure block and slide bar connection, the slide bar passes through the lug on the stay cord connection activity plunger, and tensile cover is on the fixed pulley, compare in prior art, can rise and upwards push up the slide bar when pressure block is full of plastics in the die cavity, slide on the slide bar and can stretch the stay cord, through the stay cord shrink of fixed pulley with connecting lug one end, make the lug outwards slide to the laminating of recess, will push up the highest position with the slide bar when the injection moulding is accomplished in the die cavity like this, the stay cord can be with lug and the complete taut laminating of recess this moment, and then cooperation activity plunger seals whole injection hole completely, the plastic products after the shaping can not have the projection of injection hole part, the trouble of excision has been saved, the material has been saved simultaneously.

Drawings

FIG. 1 is a schematic view of the present invention;

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;

FIG. 3 is a cross-sectional view of the mold assembly of the present invention;

FIG. 4 is an enlarged view of FIG. 2 at B;

fig. 5 is an enlarged view of fig. 3 at C.

In the figure: 1. a movable die holder; 2. a static die holder; 3. a guide post; 4. injection molding holes; 5. a static mold core; 6. a movable mold core; 7. a guide sleeve; 8. a top rod; 9. a movable plunger; 10. briquetting; 11. a pressure chamber; 12. a protection spring; 13. a return spring; 14. a pressure block; 15. a hollow chamber; 16. a slide bar; 17. pulling a rope; 18. a fixed pulley; 19. a bump; 20. a limiting chute; 21. and (4) a groove.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below 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.

Referring to fig. 1-5, a precision mold for processing plastic products comprises a movable mold base 1 and a stationary mold base 2, wherein a movable mold core 6 is disposed at the middle of the bottom surface of the movable mold base 1, a stationary mold core 5 is disposed at the middle of the top surface of the stationary mold base 2, four guide posts 3 are movably sleeved inside the stationary mold base 2 in a rectangular shape, a protection spring 12 is movably sleeved on the outer ring of each guide post 3, a penetrating injection molding hole 4 is formed at the middle of the movable mold base 1, a movable plunger 9 is movably sleeved inside the injection molding hole 4, a guide sleeve 7 matched with the guide posts 3 is disposed at the top of the movable mold base 1, a push rod 8 is movably sleeved inside the bottom of the stationary mold base 2, a return spring 13 is movably sleeved on the outer ring of the push rod 8, a press block 10 is movably sleeved inside the guide sleeve 7, a pressure chamber 11 is communicated with one end of the guide sleeve 7 located inside the movable mold base 1, cavity 15 has been seted up to the position of movable die holder 1 between pressure chamber 11 and injection molding hole 4, pressure piece 14 is close to the top fixedly connected with slide bar 16 of injection molding hole 4 one end, slide bar 16's top fixedly connected with stay cord 17, inside cavity 15 is run through to the top of slide bar 16, the bottom fixed mounting of cavity 15 has fixed pulley 18, stay cord 17 is close to the one end fixedly connected with lug 19 of injection molding hole 4, lug 19 is the semicircle form, stay cord 17 cup joints with the outer lane activity of fixed pulley 18, lug 19 activity cup joints in one side of movable plunger 9, movable plunger 9 is inside to cup joint the position of lug 19 and has been seted up spacing spout 20, movable die holder 1 has seted up the recess 21 with lug 19 looks adaptation in injection molding hole 4 inner wall department, the slot bottom department of recess 21 has seted up the through-hole and cup joints with the outer lane activity of stay cord 17, the cup joint department cup.

Wherein, the bottom surface of guide post 3 when the compound die does not contact with 2 inside contacts of quiet die holder, what adopt between guide post 3 and the quiet die holder 2 inside is the mounting means that cup joints, and connect inside the quiet die holder 2 through protection spring 12, can support downwards when guide post 3 and uide bushing 7 cooperation and press guide post 3, the protection spring 12 of setting can guarantee that 3 bottoms of guide post can not stand the horse and support and press quiet die holder 2, also can cooperate the power of unloading when the compound die is separately simultaneously, guarantee that guide post 3 can not produce the change of big instantaneous force in the quiet die holder 2 inside, and service life is longer.

The pressure block 10 and the guide sleeve 7 are sealed, the pressure block 14 and the pressure chamber 11 are sealed, the sealing treatment is performed to ensure that the inert liquid in the pressure chamber 11 cannot leak out, and the pressure chamber 11 can be used normally while avoiding the danger possibly caused by the leakage of the inert liquid.

Wherein, stay cord 17 is flare-outed completely and all inside being in cavity chamber 15 when slide bar 16 reaches the highest position, when slide bar 16 pushed up the highest point, can draw lug 19 to recess 21 and laminate completely through stay cord 17, guaranteed that injection molding hole 4 is closed completely, can not annotate the material again. .

The pull rope 17 is made of polybenzimidazole material with high toughness and high temperature resistance, and the polybenzimidazole material is a material with ultrahigh temperature resistance, high wear resistance, high strength and high rigidity, so that the influence of high-temperature plastic on the polybenzimidazole material can be effectively avoided, and the polybenzimidazole plastic rope can be used for a long time and has long service life.

When the convex block 19 slides to the innermost part of the movable plunger 9, the width between the two ends of the convex block is greater than the distance between the bottoms of the two grooves 21 formed in the inner surface of the movable die holder 1, the two convex blocks 19 can be compressed and slide towards the middle during material injection, the distance between the two convex blocks 19 is reduced at the moment, but the distance is still greater than the distance between the bottoms of the two grooves 21, and therefore the situation that the convex blocks 19 and the injection molding holes 4 are blocked and the like due to the fact that the movable plunger 9 cannot slide downwards can be guaranteed.

Wherein, 11 inside packings of pressure chamber have fluorocarbon inert liquid, and fluorocarbon inert liquid can not produce the volume change when the compression, can not change under the condition of high temperature simultaneously yet, can guarantee that the pressure that pressure chamber 11 provided is accurate, and the plastic products precision of guaranteeing to mould plastics out is high.

When the die is used, the movable die base 1 and the static die base 2 are matched with the guide sleeve 7 correspondingly through the guide column 3, the die is closed, the guide column 3 presses the pressing block 10 to compress inert liquid inwards after the die is closed, the pressure block 14 is pushed downwards through the inert liquid, molten plastic is injected into the injection hole 4, the movable plunger 9 is pressed downwards under the action of pressure, the two lugs 19 slide towards the middle, the plastic is injected into a cavity formed by the movable die core 6 and the static die core 5 from a gap between the injection hole 4 and the movable plunger 9, the pressure block 14 is pushed to the highest position when the cavity injection is finished, the slide rod 16 connected to the top of the pressure block 14 is also at the highest position, the pull rope 17 is pulled to the maximum position at the moment, the lug 19 is pulled to be attached to the groove 21 through the fixed pulley 18, and the residual plastic in the injection hole 4 and the groove 21 is extruded back into an injection head when the cavity injection, and after cooling, the die is separately assembled, and the plastic product is ejected out through the ejector rod 8, so that the molding process is completed.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a precision mold is used in plastic product processing, includes movable mould seat (1) and quiet mould seat (2), and movable mould core (6) have been seted up at the middle part of movable mould seat (1) bottom surface, and quiet mould core (5), its characterized in that have been seted up at the middle part of quiet mould seat (2) top surface: the inside of quiet die holder (2) is that the activity of rectangle form has cup jointed four guide posts (3), the outer lane activity of guide post (3) has cup jointed protection spring (12), the middle part of moving die holder (1) has seted up injection hole (4) that run through, the inside activity of injection hole (4) has cup jointed movable plunger (9), the uide bushing (7) with guide post (3) looks adaptation is seted up at the top of moving die holder (1), the inside activity of quiet die holder (2) bottom has cup jointed ejector pin (8), the outer lane activity of ejector pin (8) has cup jointed reset spring (13), the inside activity of uide bushing (7) has cup jointed briquetting (10), the uide bushing (7) is located the inside one end intercommunication of moving die holder (1) has pressure chamber (11), the bottom activity of pressure chamber (11) has cup jointed pressure piece (14), the position of moving die holder (1) between pressure chamber (11) and injection hole (4) has seted up cavity chamber (3), (12) 15) The pressure block (14) is close to a slide rod (16) fixedly connected with the top of one end of the injection molding hole (4), a pull rope (17) is fixedly connected with the top of the slide rod (16), the top end of the slide rod (16) penetrates into the hollow chamber (15), a fixed pulley (18) is fixedly installed at the bottom of the hollow chamber (15), a convex block (19) is fixedly connected with one end of the pull rope (17) close to the injection molding hole (4), the convex block (19) is semicircular, the pull rope (17) is movably sleeved with the outer ring of the fixed pulley (18), the convex block (19) is movably sleeved on one side of the movable plunger (9), a limiting sliding groove (20) is arranged at the position of the convex block (19) which is sleeved inside the movable plunger (9), a groove (21) matched with the convex block (19) is arranged at the inner wall of the injection molding hole (4) of the movable die holder (1), a through hole is arranged at the groove position of the groove (21) and is arranged, when the die is closed, plastic is injected into the cavity from a gap between the injection molding hole (4) and the movable plunger (9), the pressure block (14) is pushed to the highest position when the cavity is completely injected, and the fixed pulley (18) pulls the convex block (19) to be attached to the groove (21).

2. The precision mold for processing plastic products according to claim 1, wherein: the bottom surface of the guide post (3) is not contacted with the inside of the static die holder (2) when the die is not closed.

3. The precision mold for processing plastic products according to claim 1, wherein: and sealing treatment is carried out between the pressing block (10) and the guide sleeve (7), and sealing treatment is carried out between the pressure block (14) and the pressure chamber (11).

4. The precision mold for processing plastic products according to claim 1, wherein: when the sliding rod (16) reaches the highest position, the pull rope (17) is completely straightened and is completely positioned in the hollow chamber (15).

5. The precision mold for processing plastic products according to claim 1, wherein: the pull rope (17) is made of high-toughness high-temperature-resistant polybenzimidazole material.

6. The precision mold for processing plastic products according to claim 1, wherein: when the lug (19) slides to the innermost part of the movable plunger (9), the width between the two ends of the lug is larger than the distance between the bottoms of the two grooves (21) formed in the inner surface of the movable die holder (1).

7. The precision mold for processing plastic products according to claim 1, wherein: the pressure chamber (11) is filled with fluorocarbon inert liquid.