CN213733162U

CN213733162U - Hot runner structure of injection mold

Info

Publication number: CN213733162U
Application number: CN202022593095.6U
Authority: CN
Inventors: 陈旭龙; 王权辉; 罗繁
Original assignee: Acuway Molds Ltd
Current assignee: Acuway Molds Ltd
Priority date: 2020-11-10
Filing date: 2020-11-10
Publication date: 2021-07-20
Anticipated expiration: 2030-11-10

Abstract

The utility model relates to an injection mold's hot runner structure relates to injection mold's field, including cover half and the movable mould that sets up from top to bottom, cover half and movable mould are hugged closely and are equipped with the die cavity between cover half and the movable mould, and the mouth of moulding plastics has been seted up to the upper end of die cavity, and the upper surface butt of cover half has connect the kickboard, fixedly connected with nozzle and nozzle cover on the kickboard, and the lower extreme interlude of nozzle is in the cover half and with the mouth intercommunication of moulding plastics, and the nozzle cover cup joints in the outside of nozzle. This application has extension nozzle life's effect.

Description

Hot runner structure of injection mold

Technical Field

The application relates to the field of injection molds, in particular to a hot runner structure of an injection mold.

Background

An injection mold is a tool for producing plastic products and also a tool for giving the plastic products complete structure and precise dimensions. Injection molding is a processing method used in mass production of parts with complex shapes, and particularly relates to a method for injecting heated and melted plastic into a mold cavity from an injection molding machine at high pressure, cooling and solidifying to obtain a molded product, wherein the molding liquid can be molten resin and the like.

Chinese patent with the existing publication number CN103538208B discloses an open injection mouth type hot runner injection mold device, which comprises: the injection molding device comprises a movable mold, a fixed mold, a cavity, an injection molding opening, a molten resin passage, a nozzle and a nozzle tip, wherein the fixed mold is arranged above the movable mold, the cavity is arranged between the movable mold and the fixed mold, the injection molding opening is arranged above the cavity, the nozzle is arranged in the fixed mold, the molten resin passage coaxial with the central axis of the nozzle is arranged in the nozzle, the nozzle tip is arranged in front of the nozzle, and the nozzle tip is connected with the injection molding opening. During operation, molten resin enters the nozzle from the molten resin passage, then enters the cavity along the nozzle, the nozzle tip and the injection port, and finally solidifies in the molten resin cavity to form a workpiece. After the injection molding of the workpiece is finished, the nozzle is controlled to move towards the direction far away from the fixed die, so that the molten resin solidified at the tip of the nozzle and the molten resin solidified at the injection port are separated in a fracture mode, and the workpiece which is relatively complete is formed in the cavity.

In view of the above-mentioned related art, the inventor believes that in the process of controlling the nozzle to move away from the fixed die, the nozzle and the fixed die continuously generate friction, so that the nozzle may be damaged, and the service life of the nozzle is shortened.

SUMMERY OF THE UTILITY MODEL

In order to prolong the service life of the nozzle, the application provides a hot runner structure of an injection mold.

The application provides an injection mold's hot runner structure adopts following technical scheme:

the utility model provides an injection mold's hot runner structure, includes cover half and the movable mould that sets up from top to bottom, and cover half and movable mould are hugged closely and are equipped with the die cavity between cover half and the movable mould, and the mouth of moulding plastics has been seted up to the upper end of die cavity, and the upper surface of cover half has supported the kickboard, fixedly connected with nozzle and nozzle cover on the kickboard, and the lower extreme of nozzle alternates into the cover half and with mould plastics mouthful intercommunication, and the nozzle cover cup joints in the outside of nozzle.

By adopting the technical scheme, the forming liquid is injected into the nozzle, the forming liquid enters the cavity from the injection port along the nozzle, when the cavity is full of the forming liquid, the injection of the forming liquid into the cavity is stopped, after the forming liquid in the cavity is cooled and solidified, the floating plate is pulled to move in the direction away from the cavity, the floating plate moves to drive the nozzle and the nozzle sleeve to move, so that the nozzle is separated from the injection port, namely the forming liquid solidified at the nozzle and the injection port is fractured, and thus the workpiece in the cavity is formed completely; in the process that the nozzle moves in the direction far away from the cavity, the nozzle sleeve protects the nozzle, the friction between the nozzle and the fixed die is reduced, and the service life of the nozzle is prolonged conveniently.

Preferably, the lower surface of the floating plate is provided with a fixing groove, the upper end of the nozzle sleeve is clamped into the fixing groove, and the nozzle sleeve is fixedly connected with the floating plate through a bolt.

Through adopting above-mentioned technical scheme, the upper end of nozzle sleeve earlier with fixed slot joint, through the bolt with nozzle sleeve and kickboard fixed connection, so strengthened the installation of nozzle sleeve.

Preferably, the upper surface mounting of kickboard has the front mould bedplate, and the upper surface mounting of front mould bedplate has the position circle, and the position circle runs through the front mould bedplate, and the upper surface of kickboard is seted up flutedly, and recess internal fixation has the hot runner block fixed with the transition piece, and the hot runner block is equipped with the runner with the transition piece inside, and the runner runs through the upper surface of transition piece, and the transition piece is fixed with the inner wall of position circle, and the upper end of nozzle alternates into in the recess and fixed with the hot runner block, and the runner runs through the lower surface and the nozzle intercommunication of hot runner block.

By adopting the technical scheme, the molding liquid is poured into the positioning ring, enters the flow channel from the upper surface of the transition block, enters the nozzle along the flow channel and finally enters the cavity; when the nozzle is separated from the injection molding opening, the front mold base plate is pulled in the direction away from the cavity, the front mold base plate drives the floating plate and the nozzle to move in the direction away from the cavity until the nozzle is separated from the injection molding opening, and the injection molding device is simple in structure and convenient to operate.

Preferably, the inner wall of the positioning ring gradually shrinks towards the direction close to the transition block.

Through adopting above-mentioned technical scheme, when pouring into the shaping liquid in the retainer plate, the shaping liquid of being convenient for assembles more smoothly and gets into the inside of runner along the upper surface of transition piece.

Preferably, the flow channel comprises a first channel located inside the transition block and a second channel located inside the hot runner block, the first channel is communicated with the second channel, the side surface of the second channel is communicated with the nozzle, the upper surface of the hot runner block is provided with a mounting groove, and the transition block is fixed inside the mounting groove.

Through adopting above-mentioned technical scheme, inside the shaping liquid got into the nozzle along first passageway, second passageway, first passageway was installed inside the mounting groove, when reducing the shaping liquid entering second passageway in the first passageway, the emergence of the shaping liquid from taking place the leakage condition between transition piece and the hot runner piece.

Preferably, the upper surface and the lower surface of the hot runner block are respectively provided with a connecting groove, and a heating wire is respectively fixed in each connecting groove.

Through adopting above-mentioned technical scheme, heat the hot runner piece through the electric heat wire, so reduce the inside shaping liquid of hot runner piece and take place the possibility of solidifying, the shaping liquid more smooth flow in the runner of being convenient for is to the nozzle in.

Preferably, the hot runner block is connected with at least one supporting rod in a threaded manner, two ends of the supporting rod penetrate through the hot runner block and are respectively connected with supporting blocks in a threaded manner, the upper surface of each supporting block above the hot runner block abuts against the lower surface of the front mold base plate, and the lower surface of each supporting block below the hot runner block abuts against the bottom wall of the corresponding groove.

Through adopting above-mentioned technical scheme, the supporting shoe makes to have the clearance between hot runner piece and the front mould seat board, also makes to have the clearance between the diapire of hot runner piece and recess for the inconvenient contact front mould bedplate of heating wire and the diapire of recess reduce the heating wire and produce the emergence of the destruction condition because of generating heat to front mould bedplate and kickboard.

Preferably, the lower surface of the hot runner is fixed with a balance block, the bottom surface of the groove is provided with a balance groove, and the lower end of the balance block is clamped with the balance groove.

Through adopting above-mentioned technical scheme, thereby the balancing piece plays supporting role to the hot runner piece and makes the hot runner piece keep balance, so the shaping liquid in the second passageway of being convenient for flows in the nozzle.

Preferably, a water conveying insert is fixed inside the fixed die.

Through adopting above-mentioned technical scheme, fortune water mold insert is used for cooling this injection mold for the mould is produced under the homothermal condition.

In summary, the present application includes at least one of the following beneficial technical effects:

1. in the process that the nozzle moves in the direction far away from the cavity, the nozzle sleeve protects the nozzle, so that the friction between the nozzle and the fixed die is reduced, and the service life of the nozzle is prolonged conveniently;

2. the electric heating wire heats the hot runner block, so that the possibility of solidification of the molding liquid in the hot runner block is reduced, and the molding liquid in the runner can flow into the nozzle more smoothly.

Drawings

FIG. 1 is a cross-sectional view of an embodiment of the present application embodying a hot-runner configuration.

Fig. 2 is a schematic structural diagram of a flow channel according to an embodiment of the present application.

Fig. 3 is a schematic structural diagram of a water-transporting insert according to an embodiment of the present application.

Description of reference numerals: 1. a connecting plate; 11. positioning rings; 2. a front mold base plate; 3. a floating plate; 31. a groove; 311. a balancing tank; 32. a hot runner block; 321. mounting grooves; 322. connecting grooves; 323. an electric heating wire; 33. a transition block; 34. a nozzle; 35. a nozzle sleeve; 36. fixing grooves; 37. a threaded rod; 4. fixing a mold; 5. a cavity; 51. an injection molding port; 6. a flow channel; 61. a first channel; 62. a second channel; 7. a support block; 8. a counterbalance; 81. a placing groove; 9. and (5) carrying the water insert.

Detailed Description

The present application is described in further detail below with reference to figures 1-3.

The embodiment of the application discloses injection mold's hot runner structure. Referring to fig. 1, the hot runner structure includes connecting plate 1, front mold base plate 2, kickboard 3, cover half 4 and the movable mould (not drawn in the figure) that from top to bottom sets up, and wherein connecting plate 1, front mold base plate 2 and kickboard 3 are fixed connection in proper order, and the lower surface of kickboard 3 is supported the upper surface of cover half 4, hugs closely each other between cover half 4 and the movable mould, and is equipped with die cavity 5 between cover half 4 and the movable mould.

Referring to fig. 1 and 2, a positioning ring 11 is arranged on the upper surface of the connecting plate 1, the positioning ring 11 vertically and downwardly penetrates through the connecting plate 1 and the front mold base plate 2 in sequence, and the positioning ring 11 is fixedly connected with the connecting plate 1 and the front mold base plate 2 through bolts. Recess 31 has been seted up at the middle part of 3 upper surfaces of kickboards, and the inside fixedly connected with hot runner block 32 of recess 31, mounting groove 321 has been seted up to the upper surface of hot runner block 32, and the inside fixedly connected with transition piece 33 of mounting groove 321, the vertical inside that upwards sets up and stretch into position circle 11 of transition piece 33, and the upper end of transition piece 33 is hugged closely and fixed connection with the inside wall of position circle 11.

The lower surface of the hot runner block 32 is fixedly connected with a nozzle 34, the nozzle 34 vertically penetrates through the floating plate 3 downwards, and the nozzle 34 is inserted into the fixed die 4 and communicated with the die cavity 5. The transition block 33 and the hot runner block 32 are internally provided with a flow channel 6, the upper end of the flow channel 6 penetrates through the upper surface of the transition block 33, and the lower end of the flow channel 6 is communicated with a nozzle 34. The outer side of the nozzle 34 is sleeved with a nozzle sleeve 35, the lower surface of the floating plate 3 is provided with a fixing groove 36, and the upper end of the nozzle sleeve 35 is arranged in the fixing groove 36 and is fixedly connected with the fixing groove 36. An injection port 51 is formed at the upper end of the cavity 5, and the lower end of the nozzle 34 is communicated with the injection port 51.

When the injection molding device works, molding liquid is poured into the inner ring of the positioning ring 11, the molding liquid enters the flow channel 6 along the positioning ring 11, flows into the nozzle 34 along the flow channel 6, finally enters the cavity 5 along the nozzle 34, when the cavity 5 is filled with the molding liquid, the injection of the molding liquid into the cavity 5 is stopped, and then the molding liquid is cooled and solidified. After the molding liquid solidifies, pulling connecting plate 1 to the direction motion of keeping away from cover half 4, connecting plate 1 drives preceding die holder board 2 and kickboard 3 to the direction motion of keeping away from cover half 4, and the kickboard 3 motion drives hot runner block 32, nozzle 34 and nozzle cover 35 to the direction motion of keeping away from cover half 4, so can make nozzle 34 break away from injection molding mouth 51 for the fashioned comparatively complete of the inside work piece of die cavity 5.

The inner wall of the retainer ring 11 gradually shrinks towards the direction close to the transition block 33, that is, the diameter of the inner wall of the retainer ring 11 gradually decreases towards the direction close to the transition block 33, so that when the molding liquid is poured onto the inner wall of the retainer ring 11, the molding liquid can be more smoothly converged and enter the flow channel 6 on the transition block 33.

The threaded rod 37 is arranged in the groove 31, the threaded rod 37 penetrates through the bottom wall of the groove 31, the threaded rod 37 is in threaded connection with the floating plate 3, the lower end of the threaded rod 37 is in threaded connection with the nozzle sleeve 35, and the upper end of the threaded rod 37 is in threaded connection with the hot runner block 32. The hot runner block 32 is securely connected to the groove 31 by the threaded rod 37 and the nozzle sleeve 35 and the floating plate 3 are securely connected.

The flow channel 6 comprises a first channel 61 which is vertically arranged in the transition block 33 and a second channel 62 which is opened at one side surface of the hot runner block 32, the second channel 62 is horizontally arranged, one end of the second channel 62 is communicated with the second channel 62, and the side wall of the second channel 62 is communicated with the nozzle 34. The end of the second channel 62 remote from the first channel 61 is connected to a sealing block (not shown) which seals the second channel 62. The molding liquid that enters the retainer 11 then enters the first passage 61, the second passage 62, and the nozzle 34 along the second passage 62 in this order.

The upper surface and the lower surface of the hot runner block 32 are respectively provided with a circle of connecting grooves 322, each connecting groove 322 is internally and respectively fixedly connected with a circle of heating wires 323, and the hot runner block 32 is made of a material with better heat conductivity. When the molding liquid is injected into the runner 6, the hot runner block 32 is heated by the heating wire 323, so that the possibility of the molding liquid in the runner 6 being solidified is reduced, and the molding liquid in the runner 6 flows smoothly into the runner 6 in the nozzle 34.

Four edges of hot runner block 32 do not have the bracing piece by threaded connection, the hot runner block 32 all runs through at the both ends that the equal vertical direction of every bracing piece set up and the bracing piece, the upper and lower both ends of every bracing piece are threaded connection respectively has supporting shoe 7, the lower surface that is located the front mould bedplate 2 is contradicted to the upper surface of supporting shoe 7 above hot runner block 32, the diapire that is located the lower surface conflict recess 31 of supporting shoe 7 of hot runner block 32 below, so supporting shoe 7 plays the effect of support to hot runner block 32. And a gap with the height of one supporting block 7 is formed between the hot runner and the bottom wall of the front die holder plate 2 and the bottom wall of the groove 31, so that the heating wire 323 is not easy to contact the bottom walls of the front die holder plate 2 and the groove 31, and the heating of the heating wire 323 is reduced, thereby damaging the front die holder plate 2 and the floating plate 3.

The lower surface of hot runner piece 32 is equipped with balancing piece 8, and the lower surface of balancing piece 8 has seted up and has put groove 81, and the diapire of putting groove 81 is twisted there is the bolt, and the bolt runs through balancing piece 8 and hot runner piece 32 threaded connection. The bottom surface of the groove 31 is provided with a balance groove 311, the lower end of the balance weight 8 is clamped with the balance groove 311, the balance weight 8 supports the hot runner block 32 so as to keep the hot runner block 32 balanced, and thus the molding liquid in the second channel 62 can conveniently flow into the nozzle 34.

Referring to fig. 3, the water transporting insert 9 is fixedly connected to the inside of the fixed mold 4, the water transporting insert 9 is made of a material with good heat conductivity, and the water transporting insert 9 is convenient for cooling the injection mold, so that the mold is easy to produce under the condition of constant temperature.

The implementation principle of the hot runner structure of the injection mold in the embodiment of the application is as follows: when a workpiece needs to be injection molded, molding liquid is injected into the positioning ring 11, enters the first channel 61 along the positioning ring 11, and sequentially enters the cavity 5 along the first channel 61, the second channel 62 and the nozzle 34;

when the molding liquid just fills the die cavity 5, the injection of the molding liquid is stopped, after the molding liquid in the die cavity 5 is cooled and solidified to form a workpiece, the connecting plate 1 is pulled in the direction away from the fixed die 4, the connecting plate 1 drives the front die base plate 2, the floating plate 3, the nozzle 34 and the nozzle sleeve 35 to move in the direction away from the die cavity 5, so that the nozzle 34 is separated from the injection molding opening 51, the molding liquid solidified at the nozzle 34 and the injection molding opening 51 can be broken, and thus, a relatively complete workpiece is formed in the die cavity 5.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides an injection mold's hot runner structure, includes cover half (4) and the movable mould that sets up from top to bottom, cover half (4) and movable mould are hugged closely and are equipped with die cavity (5) between cover half (4) and the movable mould, and mouth (51), its characterized in that of moulding plastics have been seted up to the upper end of die cavity (5): the upper surface of the fixed die (4) is abutted with the floating plate (3), the floating plate (3) is fixedly connected with a nozzle (34) and a nozzle sleeve (35), the lower end of the nozzle (34) penetrates into the fixed die (4) and is communicated with the injection molding opening (51), and the nozzle sleeve (35) is sleeved on the outer side of the nozzle (34).

2. The hot-runner structure of an injection mold according to claim 1, wherein: the lower surface of the floating plate (3) is provided with a fixing groove (36), the upper end of the nozzle sleeve (35) is clamped into the fixing groove (36), and the nozzle sleeve (35) is fixedly connected with the floating plate (3) through bolts.

3. The hot-runner structure of an injection mold according to claim 1, wherein: the upper surface of kickboard (3) is fixed with front mould bedplate (2), the upper surface of front mould bedplate (2) is fixed with position circle (11), position circle (11) run through front mould bedplate (2), the upper surface of kickboard (3) is seted up flutedly (31), recess (31) internal fixation has hot runner block (32) fixed with transition block (33), hot runner block (32) and transition block (33) inside are equipped with runner (6), runner (6) run through the upper surface of transition block (33), transition block (33) are fixed with the inner wall of position circle (11), the upper end of nozzle (34) is worn to inject in recess (31) and is fixed with hot runner block (32), runner (6) run through the lower surface and nozzle (34) intercommunication of hot runner block (32).

4. The hot-runner structure of an injection mold according to claim 3, wherein: the inner wall of the positioning ring (11) gradually shrinks towards the direction close to the transition block (33).

5. The hot-runner structure of an injection mold according to claim 3, wherein: the runner (6) comprises a first channel (61) and a second channel (62), the first channel (61) is located inside the transition block (33), the second channel (62) is located inside the hot runner block (32), the first channel (61) is communicated with the second channel (62), the side face of the second channel (62) is communicated with the nozzle (34), an installation groove (321) is formed in the upper surface of the hot runner block (32), and the transition block (33) is fixed inside the installation groove (321).

6. The hot-runner structure of an injection mold according to any one of claims 3, 4, and 5, wherein: connecting grooves (322) are respectively formed in the upper surface and the lower surface of the hot runner block (32), and heating wires (323) are respectively fixed in each connecting groove (322).

7. The hot-runner structure of an injection mold according to claim 6, wherein: the hot runner block (32) is connected with at least one supporting rod in a threaded manner, two ends of the supporting rod penetrate through the hot runner block (32) and are respectively connected with the supporting blocks (7) in a threaded manner, the upper surface of each supporting block (7) above the hot runner block (32) abuts against the lower surface of the front mold base plate (2), and the lower surface of each supporting block (7) below the hot runner block (32) abuts against the bottom wall of the corresponding groove (31).

8. The hot-runner structure of an injection mold according to claim 5, wherein: the lower surface of the hot runner is fixed with a balance block (8), the bottom surface of the groove (31) is provided with a balance groove (311), and the lower end of the balance block (8) is clamped with the balance groove (311).

9. The hot-runner structure of an injection mold according to claim 1, wherein: and a water conveying insert (9) is fixed in the fixed die (4).