CN107756743B

CN107756743B - Secondary demolding mechanism for fine convex columns of injection mold

Info

Publication number: CN107756743B
Application number: CN201711009000.8A
Authority: CN
Inventors: 梁正华
Original assignee: Zhejiang Kaihua Mould Co Ltd
Current assignee: Zhejiang Kaihua Mould Co Ltd
Priority date: 2017-10-25
Filing date: 2017-10-25
Publication date: 2023-04-18
Anticipated expiration: 2037-10-25
Also published as: CN107756743A

Abstract

A secondary demoulding mechanism of a fine convex column of an injection mould comprises an upper compound plate and a lower compound plate, wherein a cavity is arranged below the upper compound plate, a through hole is formed in the lower compound plate, a mould pin is arranged on the lower compound plate, an upper thimble plate, a lower thimble plate and a thimble are arranged on the lower compound plate between the mould pins, a mould core is arranged on the mould pin, an injection moulding plastic piece is arranged between the mould core and the cavity, the convex column is manufactured below the plastic piece, and a fixing hole is manufactured in the convex column.

Description

Secondary demolding mechanism for fine convex columns of injection mold

Technical Field

The invention relates to an injection mold, in particular to a secondary demolding mechanism for a fine convex column of the injection mold.

Background

Injection mold is to working of plastics injection moulding back, if the surface system of working of plastics has tiny projection, and the inner wall of projection has little internal diameter fixed orifices still, prior art adopts the department section of thick bamboo to deviate from the fixed orifices of working of plastics usually, department section of thick bamboo includes the tiny fixed needle of an external diameter, fixed needle is fixed mutually with lower multiple plate, the upper end of fixed needle cooperatees with the fixed orifices of working of plastics, fixed needle overcoat has the ejector pin cover, the lower extreme and last of ejector pin cover, lower ejector pin is fixed mutually, the upper end of ejector pin cover contacts with the projection lower extreme of working of plastics, after working of plastics injection moulding, fixed needle keeps motionless, the ejector pin cover pushes up under the working of plastics projection, through upper and lower thimble board drive ejector pin cover and thimble ejecting, make the fixed orifices of working of plastics deviate from fixed needle, the shortcoming that this structure exists is: because the sizes of the convex column and the fixed hole of the plastic part are very small, the sizes of the corresponding fixed needle and the ejector rod sleeve are also very small, the packing force of the fixed hole to the head part of the fixed needle is very large, the convex column is jacked by the ejector rod sleeve, the ejector rod sleeve is very easy to bend and deform, the ejector rod sleeve is sleeved outside the fixed needle, the fixed needle is also bent and deform along with the ejector rod sleeve, the service lives of the fixed needle and the ejector rod sleeve are short, the fixed needle and the ejector rod sleeve need to be frequently replaced, and the replacement cost of accessories is improved.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provide the secondary demolding mechanism for the fine convex columns of the injection mold, which has high structural strength, ensures the service life and reduces the replacement cost of accessories.

The invention discloses a secondary demoulding mechanism of a fine convex column of an injection mould, which adopts the technical scheme that: including compound board and lower compound board, set up the die cavity under going up the compound board, it has the perforation to open in the compound board down, set up the mould foot on the compound board down, set up thimble board on the lower compound board between the mould foot, thimble board and thimble down, the injection machine ejector pin passes the perforation and contacts with thimble board down, set up the core on the mould foot, there is injection moulding's working of plastics between core and the die cavity, the system has the tiny projection of external diameter down, the system has the fixed orifices in the projection, its characterized in that: the lower compound plate on set up the fixed column, the head system of fixed column has little cylinder, little cylinder cooperatees with the fixed orifices of working of plastics, it has lower spring groove to open under last thimble board and the lower thimble board, set up lower spring in the spring groove down, the upper end of lower spring contacts with last thimble board, the lower extreme of lower spring contacts with lower compound plate, it has last spring groove to make on the mould foot, set up the upper spring in the last spring groove, the upper end of upper spring contacts with the core, the lower extreme of upper spring contacts with the mould foot, it has spacing draw groove to open on the core, set up spacing arm-tie in the mould foot, spacing arm-tie passes the core and connects spacing arm-tie, spacing arm-tie cooperatees with spacing draw groove.

The invention discloses a secondary demoulding mechanism for fine convex columns of an injection mould, which is characterized in that after a plastic part is subjected to injection moulding, the mould is gradually opened, at the moment, a mould foot and a lower compound plate are pushed by an upper spring and a lower spring under the action of restoring force, the mould foot is pushed downwards, the mould foot drives the lower compound plate, a mould core is kept still firstly, the lower spring pushes the lower compound plate downwards, the lower compound plate drives a fixed column to be downwards, an upper thimble plate, a lower thimble plate and an ejector pin are kept still firstly, at the moment, the mould is opened once between the mould core and the mould foot, the plastic part, the mould core, the upper thimble plate, the lower thimble plate and the ejector pin are all kept still, a small cylinder on the plastic part is separated from a fixed hole of the convex column firstly, when the limit pull plate is contacted with a limit pull groove of the mould core, the mould core is stopped to be opened between the mould foot, the limit pull plate drives the mould core to move backwards together, the mould is opened from the mould core and then drives the upper thimble plate, the lower thimble plate, the upper thimble plate, the lower thimble plate and the ejector pin to move backwards when the lower thimble plate are contacted with a limit pull groove of the lower ejector pin of the injection machine, the mould is opened, the mould, the upper thimble plate and the ejector pin is stopped to eject the lower thimble plate. This scheme injection mold's secondary demoulding mechanism of tiny projection, through with fixed column and small circle post integrated into one piece, utilize upper and lower spring to make the mould follow the mould core earlier and the mould foot once the die sinking, the fixed orifices that makes the working of plastics drops out little cylinder earlier, for ejector pin cover follows the ejecting structure of thimble directly with the working of plastics in the department's section of thick bamboo of having now, its intensity is higher, long service life, the projection and the fixed orifices of working of plastics deviate from conveniently, the replacement cost of accessory has been reduced.

According to the secondary demolding mechanism for the small convex columns of the injection mold, the fixed columns penetrate through the lower spring, and the limiting pull pins penetrate through the upper spring. The fixed column can play a guiding role for the lower spring, the limiting pull pin can play a guiding role for the upper spring, the upper spring and the lower spring are prevented from offsetting when being ejected, particularly, after the upper ejector plate and the lower ejector plate are continuously ejected upwards by the ejector rod of the injection machine, the upper end of the lower spring is separated from the upper ejector plate, and the fixed column can play a limiting role for the lower spring and prevent the lower spring from shaking.

Drawings

FIG. 1 is a schematic structural diagram of a mold closing state of a secondary demolding mechanism of an injection mold fine convex column;

FIG. 2 is a schematic diagram of an open-mold state structure of a secondary demolding mechanism for a fine convex column of an injection mold;

fig. 3 is a schematic structural diagram of a plastic part ejection state of a secondary demolding mechanism for an injection mold with fine convex columns.

Detailed Description

The invention relates to a secondary demoulding mechanism of a tiny convex column of an injection mould, as shown in figures 1-3, comprising an upper compound plate 1 and a lower compound plate 2, wherein a cavity 3 is arranged below the upper compound plate, a perforation 4 is arranged in the lower compound plate, a mould foot 5 is arranged on the lower compound plate, an upper thimble plate 6, a lower thimble plate 7 and a thimble 8 are arranged on the lower compound plate between the mould feet, an ejector rod 9 of an injection machine penetrates through the perforation 4 to be contacted with the lower thimble plate 7, a mould core 10 is arranged on the mould foot, an injection moulding plastic piece 11 is arranged between the mould core and the cavity 3, a convex column 12 with a tiny external diameter is arranged below the plastic piece, and a fixed hole 13 is arranged in the convex column, and the secondary demoulding mechanism is characterized in that: the lower compound plate 2 is provided with a fixed column 14, the head of the fixed column is provided with a small cylinder 15, the small cylinder is matched with a fixed hole 13 of the plastic part 11, a lower spring groove 16 is formed below the upper thimble plate 6 and the lower thimble plate 7, a lower spring 17 is arranged in the lower spring groove, the upper end of the lower spring is contacted with the upper thimble plate, the lower end of the lower spring is contacted with the lower compound plate 2, an upper spring groove 18 is formed on the mold leg 5, an upper spring 19 is arranged in the upper spring groove, the upper end of the upper spring is contacted with the mold core 10, the lower end of the upper spring is contacted with the mold leg, a limiting pull groove 20 is formed on the mold core, a limiting pull pin 21 is arranged in the mold leg, the limiting pull pin penetrates through the mold core 10 to be connected with a limiting pull plate 22, and the limiting pull plate is matched with the limiting pull groove 20. After the plastic part 11 is injection molded, the mold is gradually opened, at this time, the upper spring 19 and the lower spring 17 push the mold leg 5 and the lower compound plate 2 under the action of restoring force, the upper spring 19 pushes the mold leg 5 downwards, the mold leg drives the lower compound plate 2, so that the mold core 10 is firstly kept still, the lower spring 17 pushes the lower compound plate downwards, the lower compound plate drives the fixed column 14 downwards, so that the upper and

lower ejector plates

6, 7 and the ejector pins 8 are firstly kept still, at this time, the mold is firstly opened between the mold core 10 and the mold leg 5 once, the plastic part 11, the mold core 10, the upper ejector plate 6, the lower ejector plate 7 and the ejector pin plastic part 8 are all kept still, so that the small cylinder 15 on the fixed column 14 is firstly released from the fixed hole 13 of the plastic part convex column 12, when the limiting pull plate 22 is in contact with the limiting pull groove 20 of the mold core 10, the mold core is stopped to be opened between the mold core and the mold leg 5, at this time, the limiting pull plate drives the mold core to move backwards together, the mold is opened from the mold core and drives the upper ejector pin plate 7 and the ejector pin 7 to move towards the lower ejector pin 9 after the mold core and the mold cavity 3, the ejector pin moves towards the ejector pin, and the ejector pin 9, and the ejector pin moves towards the ejector pin to push the lower ejector pin. This scheme injection mold secondary demoulding mechanism of tiny projection, through with fixed column 14 and the shaping of small circle post 15 integrated into one piece, utilize upper and

lower spring

19, 17 make the mould earlier from the mould core 10 and the mould foot 5 once mould sinking, make the fixed orifices 13 of working of plastics take off little cylinder 15 earlier, for ejector pin cover follows the ejecting structure of thimble directly with the working of plastics in the existing department's section of thick bamboo, its intensity is higher, long service life, the projection 12 and the fixed orifices 13 of working of plastics 11 deviate from conveniently, the replacement cost of accessory has been reduced. The fixed column 14 passes through the lower spring 17, and the limiting pull pin 21 passes through the upper spring 19. The fixing column 14 can play a role in guiding the lower spring 17, the limiting pull pin 21 can play a role in guiding the upper spring 19, and the upper spring and the lower spring are prevented from offsetting during ejection, particularly after the ejector rod 9 of the injection machine continuously ejects the upper ejector plate 6 and the lower ejector plate 7 upwards, the upper end of the lower spring 17 is separated from the upper ejector plate, and the fixing column 14 can play a role in limiting the lower spring 17 and prevent the lower spring 17 from shaking.

Claims

1. Secondary demoulding mechanism of the tiny convex column of injection mold, including last multiple sheet (1) and lower multiple sheet (2), it sets up die cavity (3) down to go up the multiple sheet, it has perforation (4) to open in the multiple sheet down, set up moulding foot (5) on the multiple sheet down, set up thimble board (6) on the lower multiple sheet between the moulding foot, thimble board (7) and thimble (8) down, injection machine ejector pin (9) pass perforation (4) and contact with thimble board (7) down, set up core (10) on the moulding foot, there is injection moulding's working of plastics (11) between core and die cavity (3), the system has thin and small convex column (12) of external diameter under the working of plastics, the system has fixed orifices (13) in the convex column, its characterized in that: the lower compound plate (2) is provided with a fixed column (14), the head part of the fixed column is provided with a small cylinder (15), the small cylinder is matched with a fixed hole (13) of a plastic piece (11), a lower spring groove (16) is formed under an upper thimble plate (6) and a lower thimble plate (7), a lower spring (17) is arranged in the lower spring groove, the upper end of the lower spring is contacted with the upper thimble plate, the lower end of the lower spring is contacted with the lower compound plate (2), an upper spring groove (18) is formed on a mold foot (5), an upper spring (19) is arranged in the upper spring groove, the upper end of the upper spring is contacted with a mold core (10), the lower end of the upper spring is contacted with the mold foot, a limiting pull groove (20) is formed on the mold core, a limiting pull pin (21) is arranged in the mold foot, the limiting pull pin penetrates through the mold core (10) to be connected with a limiting pull plate (22), the limiting pull plate is matched with the limiting pull groove (20), after the mold (11) is subjected to injection molding, the mold is gradually opened, the upper spring (19) and the lower spring (17) pushes the lower compound plate (5) and the lower thimble plate (7) and the lower thimble plate (6) is not pushed to drive the lower thimble plate (7) to move downwards, so that the lower thimble plate (7) and the lower thimble plate (7) do not drive the lower thimble plate (7) to move downwards, at the moment, the mold is firstly opened from the position between the mold core (10) and the mold pins (5), the plastic part (11), the mold core (10), the upper ejector plate (6), the lower ejector plate (7) and the ejector pins (8) are all kept still, small cylinders (15) on fixed columns (14) firstly release fixing holes (13) of the plastic part convex columns (12), when a limiting pull plate (22) is in contact with limiting pull grooves (20) of the mold core (10), the mold core and the mold pins (5) stop opening, the limiting pull plate drives the mold core to move backwards together, the mold is opened from the mold core and the mold cavity (3) for the second time, the plastic part (11) is driven, the lower ejector plate (7) and the ejector pins (8) of the upper ejector plate (6) are driven to move backwards together, the mold is opened, when the lower ejector pin plate moves backwards to be in contact with the ejector pins (9) of the injection machine, the ejector pins of the injection machine push rods push the injection machine push the plastic part against the upper ejector pins (6) and the lower ejector pins (7) to stop moving, and the plastic part is driven by the upper ejector pins (8) and the lower ejector pins (8) to eject the plastic part.

2. The secondary demolding mechanism for the injection mold fine convex column is characterized in that: the fixed column (14) penetrates through the lower spring (17), and the limiting pull pin (21) penetrates through the upper spring (19).