CN107336408A - A kind of scissor-type two-step ejecting injection mold - Google Patents

Abstract

A scissor-type secondary ejection injection mold. The fixed mold seat plate is above the cavity plate, the core plate, the support plate and the movable mold seat plate are connected as one, and the secondary fixed plate and the secondary push plate are connected as one. , the primary fixed plate and the primary push plate are connected as one, the cavity plate push rod is positioned between the primary fixed plate and the primary push plate with a convex shoulder, the thick core push rod, thin core push rod and reset rod are positioned with a convex shoulder Between the secondary fixed plate and the secondary push plate, the lower link and the upper link have a pair of symmetrical settings, and the middle hinge is used to connect the lower link and the upper link, and the lower link is fixed on the primary push plate through the hinge. On, the upper link is fixed on the secondary push plate through a hinge. The present invention designs a scissor-type secondary demoulding injection mold for the situation that some plastic parts are still difficult to take out from the cavity after one demoulding action, through which the plastic parts can be removed smoothly Demoulding, so as to ensure the quality of plastic parts, so as to meet the demoulding requirements of some special plastic parts.

Description

A scissor-type secondary ejection injection mold

technical field

The invention relates to the field of injection molds, in particular to a scissor-type secondary ejection injection mold.

Background technique

The traditional injection mold demoulding usually adopts a one-time demoulding mechanism, but some plastic parts have special shapes. After one demoulding action, the plastic part is still difficult to take out from the cavity. At this time, an additional demoulding action must be added to make the plastic parts smooth demoulding. In addition, sometimes in order to avoid excessive stress on the plastic part after one demoulding, secondary demoulding is also used to ensure the quality of the plastic part.

Contents of the invention

In order to solve the above-mentioned problems, the present invention provides a scissor-type secondary ejection injection mold. A scissor is designed for the situation that it is still difficult to take out the plastic part from the cavity after a demoulding action for some plastic parts. The fork-type secondary demoulding injection mold can successfully demould the plastic parts through the secondary demoulding, thereby ensuring the quality of the plastic parts and meeting the demoulding requirements of some special plastic parts. To achieve this purpose, the present invention provides a A scissor-type secondary push injection mold, including fixed mold seat plate, cavity plate, core plate, support plate, long screw, secondary fixed plate, secondary push plate, primary fixed plate, primary push plate, moving mold Seat plate, lower hinge, lower connecting rod, middle hinge, upper connecting rod, upper hinge, thick core push rod, thin core push rod, cavity plate push rod, reset rod and ejector rod, the fixed mold seat plate Above the cavity plate, there is a plastic part between the fixed mold seat plate and the cavity plate, the core plate, the support plate and the movable mold seat plate are connected as a whole with long screws, the secondary fixed plate and the secondary The secondary push plate is connected as a whole with screws, the primary fixed plate and the primary push plate are connected as a whole with screws, the cavity plate push rod has a pair, and the cavity plate push rod is positioned on the primary fixed plate and the primary push plate with shoulders. Between the primary push plates, there is one thick core push rod, a pair of thin core push rods, and one reset rod, and the thick core push rod, thin core push rod and reset rod adopt The protruding shoulder is positioned between the secondary fixing plate and the secondary push plate. The lower link and the upper link each have a pair of symmetrical arrangements. The lower link and the upper link are connected by an intermediate hinge. The lower link The connecting rod is fixed on the primary push plate by the hinge, and the upper link is fixed on the secondary push plate by the hinge.

As a further improvement of the present invention, the fixed mold seat plate has a spring between the cavity plates, and the function of the spring is to give a downward elastic thrust to the cavity plate when the mold is parted from the A-A parting surface to make the cavity Under the action of spring force and gravity, the plate can move downward together with the core plate during parting.

As a further improvement of the present invention, the support plate is composed of a thin plate area, a ramp area and a thick plate area from top to bottom, the ramp area connects the thin plate area and the thick plate area, and the support plate is composed of a thin plate area, a ramp area and the thick plate area; when the connecting hinge of the upper and lower connecting rods moves to the ramp area, the lower connecting rod on the right rotates counterclockwise around the lower hinge, and the upper connecting rod on the right rotates clockwise around the upper hinge; the lower connecting rod on the left rotates around the upper hinge The lower hinge rotates clockwise, and the upper link on the left rotates counterclockwise around the upper hinge; the distance between the primary push plate and the secondary push plate increases continuously, and when the hinge of the upper and lower links moves to the thick plate area, the primary push plate and the The distance between the secondary push plates is the largest. Realize that the secondary push plate moves upwards ahead of the primary push plate, that is, realize the thick core push rod and the thin core push rod move upwards ahead of the cavity plate, so that the plastic part is released from the cavity plate. Complete the second push action.

The present invention is a scissor-type secondary ejection injection mold. If one-time ejection is used for some special plastic parts, that is, the plastic part is demoulded from the cavity plate and the core plate at one time, which will make the plastic part need to be overcome. The demoulding resistance is too large, resulting in deformation or even breakage of the plastic part, or it cannot be demolded at all; this patent designs a scissor-type secondary ejection injection mold, so that the demoulding is divided into two steps, and the mold is demoulded from the cavity plate at one time go out. Another demoulding from the core plate; disperse the demoulding resistance, so that the plastic parts can be demoulded smoothly, ensure the quality of the plastic parts, and can meet the demoulding requirements of some special plastic parts.

Description of drawings

Fig. 1 is the schematic diagram when the present invention closes mold;

Fig. 2 is the schematic diagram that the intermediate hinge of the present invention has just entered the ramp area;

Fig. 3 is a schematic diagram of the middle hinge of the present invention entering the thick plate area

Graphical description:

1. Fixed mold seat plate; 2. Plastic parts; 3. Spring; 4. Cavity plate; 5. Core plate; 6. Support plate; 6-1. Thin plate area; 6-2. Ramp area; 6- 3. Thick plate area; 7. Long screw; 8. Secondary fixed plate; 9. Secondary push plate; 10. Primary fixed plate; 11. Primary push plate; 12. Moving mold seat plate; 13. Lower hinge; 14 1. Lower connecting rod; 15. Intermediate hinge; 16. Upper connecting rod; 17. Upper hinge; 18. Thick core push rod; 19. Thin core push rod; 20. Cavity plate push rod; 21. Reset lever; 22. Ejector.

detailed description

Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

The invention provides a scissor-type secondary ejection injection mold. A scissor-type secondary ejection mold is designed for the situation that the shape of some plastic parts is still difficult to take out from the cavity after a demoulding action. Injection molds, the plastic parts are successfully demoulded through secondary demoulding, thereby ensuring the quality of the plastic parts and meeting the demoulding requirements of some special plastic parts.

As a specific embodiment of the present invention, the present invention provides a scissor-type secondary ejection injection mold, including a fixed mold seat plate 1, a cavity plate 4, a core plate 5, a support plate 6, long screws 7, secondary Fixed plate 8, secondary push plate 9, primary fixed plate 10, primary push plate 11, movable mold seat plate 12, lower hinge 13, lower connecting rod 14, middle hinge 15, upper connecting rod 16, upper hinge 17, coarse type Core push rod 18, thin core push rod 19, cavity plate push rod 20, reset rod 21 and ejector pin 22, the fixed mold seat plate 1 is above the cavity plate 4, and the fixed mold seat plate 1 is connected with the mold cavity plate There are plastic parts 2 between the cavity plates 4, the core plate 5, the supporting plate 6 and the movable mold seat plate 12 are connected as a whole with long screws 7, and the secondary fixing plate 8 and the secondary pushing plate 9 are connected with screws As a whole, the primary fixing plate 10 and the primary pushing plate 11 are connected together by screws, and the cavity plate push rod 20 has a pair, and the cavity plate pushing rod 20 is positioned on the primary fixing plate 10 and the primary Between the push plates 11, there is one thick core push rod 18, a pair of thin core push rods 19, one reset rod 21, one thick core push rod 18, thin core push rod 19 and the reset lever 21 are positioned between the secondary fixing plate 8 and the secondary push plate 9 by shoulders, the lower connecting rod 14 and the upper connecting rod 16 each have a pair of symmetrical settings, and the lower connecting rod 14 and the upper connecting rod The rods 16 are connected by an intermediate hinge 15 , the lower link 14 is fixed on the primary push plate 11 by the hinge 13 , and the upper link 16 is fixed on the secondary push plate 9 by the hinge 17 .

As a specific embodiment of the present invention, the present invention provides a scissor-type secondary ejection injection mold, including a fixed mold seat plate 1, a cavity plate 4, a core plate 5, a support plate 6, long screws 7, secondary Fixed plate 8, secondary push plate 9, primary fixed plate 10, primary push plate 11, movable mold seat plate 12, lower hinge 13, lower connecting rod 14, middle hinge 15, upper connecting rod 16, upper hinge 17, coarse type Core push rod 18, thin core push rod 19, cavity plate push rod 20, reset rod 21 and ejector pin 22, the fixed mold seat plate 1 is above the cavity plate 4, and the fixed mold seat plate 1 is connected with the mold cavity plate There are plastic parts 2 between the cavity plates 4, and the fixed mold seat plate 1 has a spring 3 between the cavity plates 4. The function of the spring is to give the cavity plate a downward pressure when the mold is parted from the A-A parting surface. The elastic thrust makes the cavity plate move downward together with the core plate during parting under the action of spring force and gravity. The core plate 5, support plate 6 and movable mold seat plate 12 are The screw 7 is connected as a whole, and the support plate 6 is composed of a thin plate area 6-1, a ramp area 6-2 and a thick plate area 6-3 from top to bottom, and the ramp area 6-2 connects the thin plate area 6- 1 is connected to the thick plate area 6-3, and the support plate is composed of a thin plate area, a ramp area and a thick plate area; when the connecting hinge of the upper and lower connecting rods moves to the ramp area, the lower connecting rod on the right rotates counterclockwise around the lower hinge , the upper link on the right rotates clockwise around the upper hinge; the lower link on the left rotates clockwise around the lower hinge, and the upper link on the left rotates counterclockwise around the upper hinge; the distance between the primary push plate and the secondary push plate continues to increase Large, when the hinge of the upper and lower connecting rods moves to the thick plate area, the distance between the primary push plate and the secondary push plate is the largest. Realize that the secondary push plate moves upwards ahead of the primary push plate, that is, realize the thick core push rod and the thin core push rod move upwards ahead of the cavity plate, so that the plastic part is released from the cavity plate. Complete the secondary pushing action, the secondary fixing plate 8 and the secondary pushing plate 9 are connected as one with screws, the primary fixing plate 10 and the primary pushing plate 11 are connected as one with screws, and the cavity plate push rod 20 There is a pair, the cavity plate push rod 20 is positioned between the primary fixing plate 10 and the primary push plate 11 using a shoulder, the thick core push rod 18 has one, and the thin core push rod 19 has a pair, The reset rod 21 has one, and the thick core push rod 18, the thin core push rod 19 and the reset rod 21 are positioned between the secondary fixing plate 8 and the secondary push plate 9 by shoulders. The rod 14 and the upper connecting rod 16 each have a pair of symmetrical arrangements. The middle hinge 15 is used to connect the lower connecting rod 14 and the upper connecting rod 16. The lower connecting rod 14 is fixed on the primary push plate 11 by a hinge 13. Above-mentioned connecting rod 16 is fixed on the secondary push plate 9 by hinge 17 .

If this injection mold adopts one-time demoulding, that is, the plastic parts are demoulded from the core plate and cavity plate at one time, there is a disadvantage of large demoulding resistance, which will cause excessive deformation of the plastic parts and even fail to demould. Therefore, this injection mold Secondary demoulding is required, and the demoulding action to be realized is: the mold is opened from the A-A parting surface as shown in Figure 1-3, and the plastic part is first demoulded from the core plate 5, and then the plastic part is removed from the cavity Plate 4 is ejected from the mold to realize the second push-out action, which disperses the demoulding resistance, and the plastic part can be demoulded smoothly, ensuring the quality of the plastic part. In order to realize this sequential demoulding action, this patent designs a scissor-type secondary push-out mechanism, wherein the secondary push-out process is as follows:

When the mold is opened, the mold is divided from the A-A parting surface, the fixed mold base plate does not move, and the movable mold base plate drives other plates to retreat under the action of the injection machine. After a certain distance is opened, the ejector pin 22 of the injection machine moves upward , to push the push plate 11 to move upwards once, and under the action of the upper and lower connecting rods, the push plate 9 is driven to move upwards synchronously, and the upward movement of the push plate 11 once will drive the cavity plate push rod 20 to move upwards synchronously, and the cavity plate The push rod pushes the cavity plate 4 to move upward synchronously; at the same time, the secondary push plate 9 drives the thick core push rod 18 and the thin core push rod 19 to move upward synchronously; Under the simultaneous push of the thin core push rod 19, the mold is successfully demoulded from the core plate, but the plastic part remains in the cavity plate, realizing a push-out action;

The support plate 6 of the present invention is composed of a thin plate area 6-1, a ramp area 6-2 and a thick plate area 6-3; when the connecting hinge 15 of the upper and lower connecting rods moves to the ramp area, the lower connecting rod on the right surrounds the lower hinge 13 rotates counterclockwise, the upper link on the right rotates clockwise around the upper hinge 17; the lower link on the left rotates clockwise around the lower hinge 13, and the upper link on the left rotates counterclockwise around the upper hinge 17; the primary push plate and the secondary The distance between the push plates increases continuously, and when the hinge of the upper and lower connecting rods moves to the thick plate area, the distance between the primary push plate and the secondary push plate is the largest. Realize that the secondary push plate moves upwards ahead of the primary push plate, that is, realize the thick core push rod and the thin core push rod move upwards ahead of the cavity plate, so that the plastic part is released from the cavity plate. Complete the second push action.

The function of the spring 3 of the present invention is to give the cavity plate a downward elastic thrust when the mold is parted from the A-A parting surface, so that the cavity plate can follow the shape of the mold under the action of spring force and gravity. The core boards move downward together.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any other form, and any modification or equivalent change made according to the technical essence of the present invention still belongs to the scope of protection required by the present invention .

Claims (3)

1. A scissor-type secondary ejection injection mold, including a fixed mold seat plate (1), a cavity plate (4), a core plate (5), a support plate (6), long screws (7), secondary Fixed plate (8), secondary push plate (9), primary fixed plate (10), primary push plate (11), movable mold seat plate (12), lower hinge (13), lower connecting rod (14), middle Hinge (15), upper link (16), upper hinge (17), thick core push rod (18), thin core push rod (19), cavity plate push rod (20), reset rod (21) and ejector pin (22), the fixed mold seat plate (1) is above the cavity plate (4), and there is a plastic part (2) between the fixed mold seat plate (1) and the cavity plate (4), It is characterized in that: the core plate (5), the support plate (6) and the movable mold seat plate (12) are connected as a whole with long screws (7), and the secondary fixing plate (8) and the secondary pushing plate (9) Connected as a whole with screws, the primary fixing plate (10) and the primary push plate (11) are connected as a whole with screws, the cavity plate push rods (20) have a pair, and the cavity plate push rods (20) The shoulder is used to position between the primary fixing plate (10) and the primary pushing plate (11), the thick core push rod (18) has one, and the thin core push rod (19) has a pair, The reset rod (21) has one, and the thick core push rod (18), thin core push rod (19) and reset rod (21) are positioned on the secondary fixing plate (8) and secondary Between the push plates (9), the lower link (14) and the upper link (16) each have a pair of symmetrical arrangements, and an intermediate hinge ( 15) connection, the lower connecting rod (14) is fixed on the primary push plate (11) through the hinge (13), and the upper connecting rod (16) is fixed on the secondary push plate (9) through the hinge (17) . 2. A scissor-type secondary ejection injection mold according to claim 1, characterized in that: the fixed mold seat plate (1) has a spring (3) between the cavity plates (4). 3. A scissor-type secondary ejection injection mold according to claim 1, characterized in that: the support plate (6) consists of a thin plate area (6-1), a ramp area (6- 2) and the thick plate area (6-3), the ramp area (6-2) connects the thin plate area (6-1) and the thick plate area (6-3).