Lower mold capable of stably demolding in screw cap injection mold

Abstract

The utility model discloses a lower mold capable of stably demolding in a screw cap injection mold, which comprises a mold base, a lower rotating plate and an upper rotating plate are arranged on the mold base, a cavity is reserved between the lower rotating plate and the upper rotating plate, a rotation stopping plate and a tightening plate are sequentially and movably arranged on the upper rotating plate, and a rack is slidably clamped in the cavity. A plurality of double-row gears meshed with the racks are rotationally arranged between the lower rotating plate and the upper rotating plate, a mold core gear meshed with the double-row gears is rotationally arranged between the lower rotating plate and the upper rotating plate, a mold core shaft with external threads is arranged on the mold core gear, a top sleeve is arranged on the mold core shaft in a sliding and sleeving mode, and a lead screw sleeve is arranged on the rotation stopping plate. A top shaft gear is rotationally arranged between the lower rotating plate and the upper rotating plate, the top shaft gear is meshed with the mold core gear, a top shaft is arranged on the top shaft gear, and the top shaft is in threaded connection with the lead screw sleeve. The demolding device is stable in structure, high in demolding efficiency and not prone to faults.

Description

TECHNICAL FIELD

[0001] The utility model relates to a mould, especially a lower mould capable of stable demoulding in a screw cap injection mould. BACKGROUND

[0002] When producing the screw cap, the upper mould and the lower mould are closed, the mould core and the demoulding plate in the upper mould and the lower mould form a forming cavity, the screw cap with the thread is formed in the forming cavity, and then demoulding is needed, in the demoulding process, the upper mould and the lower mould are opened, the demoulding plate is abutted on the screw cap under the action of the spring, the mould core is driven to rotate, the screw cap will not rotate with the mould core under the abutting action of the demoulding plate, the screw cap is screwed open with the mould core, and the demoulding plate ejects the screw cap screwed open with the mould core under the action of the spring. However, the spring is a vulnerable part, and is prone to failure in a long-term use process, which will affect the demoulding work of the screw cap, and the spring needs to be frequently replaced, and the use is very inconvenient. CONTENT

[0003] The utility model aims at providing a lower mould capable of stable demoulding in a screw cap injection mould which can improve the demoulding stability of the screw cap.

[0004] In order to achieve the above-mentioned purpose, the utility model adopts the technical scheme of a lower mould capable of stable demoulding in a screw cap injection mould, comprising: a mould base, a lower rotating plate and an upper rotating plate are arranged on the mould base, a cavity is left between the lower rotating plate and the upper rotating plate, a rotation stopping plate is movably arranged on the upper rotating plate, a pressing plate is movably arranged on the rotation stopping plate, a rack is slidably arranged in the cavity, a plurality of double-row gears are rotatably arranged between the lower rotating plate and the upper rotating plate, the large gear ring and the small gear ring on the double-row gears are located in the cavity, the small gear ring in the double-row gear is engaged with the rack, a plurality of mould core gears are rotatably arranged between the lower rotating plate and the upper rotating plate, the gear ring on the mould core gear is located in the cavity and is engaged with the large gear ring on the corresponding double-row gear, a mould core shaft is coaxially arranged on the mould core gear, the upper end of the mould core shaft passes through the rotation stopping plate and the pressing plate upwards, an external thread is arranged on the sidewall of the upper end of the mould core shaft, a top sleeve is slidably arranged on the mould core shaft, four screw rod sleeves are arranged around the rotation stopping plate, four top shaft gears are rotatably arranged between the lower rotating plate and the upper rotating plate, the gear ring on each top shaft gear is located in the cavity and is engaged with the gear ring on the corresponding mould core gear, a top shaft is coaxially arranged on the top shaft gear, a transmission thread is arranged on the top shaft, the top shaft passes through the upper rotating plate, and the transmission thread on the top shaft is threadedly connected with the internal thread of the screw rod sleeve.

[0005] Further, the lower mold capable of stable demolding in the screw cap injection mold, wherein the connecting structure between the clamp plate and the rotation stop plate is that four limiting grooves are arranged on the bottom wall of the four sides of the clamp plate, four connecting grooves are arranged on the four sides of the rotation stop plate, a limiting sleeve is fixed in the connecting groove and extends upward from the connecting groove, mounting holes are arranged on the bottom wall of the connecting groove, a screw sleeve is movably clamped in the mounting hole, an outer gear ring is arranged on the outer side wall of the screw sleeve, an adjusting sleeve is clamped in the mounting hole, an inner gear ring is arranged on the inner side wall of the adjusting sleeve, the outer gear ring on the screw sleeve is engaged with the inner gear ring on the adjusting sleeve, the limiting sleeve abuts against the adjusting sleeve and the screw sleeve, and a plurality of waist-shaped holes are uniformly distributed on the adjusting sleeve.

[0006] Further, the lower mold capable of stable demolding in the screw cap injection mold, wherein the top sleeve comprises an inner sliding sleeve body and an outer sliding sleeve body, the inner sliding sleeve body is arranged on the rotation stop plate in interference, the inner sliding sleeve body is slidably sleeved on the mold core shaft, the outer sliding sleeve body is slidably arranged on the outer side wall of the inner sliding sleeve body, and the outer sliding sleeve body is arranged in the clamp plate in interference.

[0007] Further, the lower mold capable of stable demolding in the screw cap injection mold, wherein a cooling sleeve is arranged in the mold core shaft, the mold core shaft is rotationally connected with the cooling sleeve, and the cooling sleeve is fixed on the mold base.

[0008] Further, the lower mold capable of stable demolding in the screw cap injection mold, wherein a rotating shaft is fixedly arranged in the mold base, the rotating shaft extends upward from the lower rotation plate and abuts against the upper rotation plate, and a double-row gear is rotationally arranged on the rotating shaft.

[0009] Further, the lower mold capable of stable demolding in the screw cap injection mold, wherein the large gear ring on each double-row gear is engaged with four mold core gears, and the four mold core gears are symmetrically arranged on the front and rear sides of the double-row gear.

[0010] The screw cap injection mold has the advantages that the structure is stable, the demolding efficiency is high, and the screw cap injection mold is not prone to faults, the double-row gear driven by the rack can drive the screw cap formed on the mold core shaft to rotate, the rotation stop plate and the clamp plate can be driven to ascend at the same time, the inner sliding sleeve body and the outer sliding sleeve body on the rotation stop plate and the clamp plate abut against the screw cap to play a brake role, the screw cap is separated from the external thread on the mold core shaft, and thus the screw cap is demolded. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 is a structural schematic view of the lower mold capable of stable demolding in the screw cap injection mold.

[0012] Figure 2 is Figure 1 is a sectional view in the A-A direction.

[0013] Figure 3 is the structure diagram of the lower die of the rotating cap injection mold capable of stable demolding in the closing of the movable die. DETAILED DESCRIPTION

[0014] The technical scheme of the utility model is further described below in combination with the drawings and preferred embodiments.

[0015] As shown in Figure 1 , Figure 2 The rotating cap injection mold capable of stable demolding of the utility model comprises a die holder 1, a lower turning plate 2 and an upper turning plate 3 are arranged on the die holder 1, a cavity 4 is left between the lower turning plate 2 and the upper turning plate 3, a rotation stopping plate 5 is movably arranged on the upper turning plate 3, a pressing plate 6 is movably arranged on the rotation stopping plate 5, a rack 41 is slidably clamped in the cavity 4, a rotating shaft 11 is fixedly arranged in the die holder 1, the rotating shaft 11 upwardly extends out of the lower turning plate 2 and abuts against the upper turning plate 3, a double-row gear 42 is rotatably arranged on the rotating shaft 11, the large gear ring 421 and the small gear ring 422 on the double-row gear 42 are both located in the cavity 4, the small gear ring 422 in the double-row gear 42 is engaged with the rack 41, a plurality of mold core gears 7 are rotatably arranged between the lower turning plate 2 and the upper turning plate 3, the gear ring on the mold core gear 7 is located in the cavity 4 and is engaged with the large gear ring 421 on the corresponding double-row gear 42, in this embodiment, the large gear ring 421 in each double-row gear 42 is engaged with four mold core gears 7, and the four mold core gears 7 are symmetrically arranged on the front and rear sides of the double-row gear 42. A mold core shaft 71 is coaxially arranged on the mold core gear 7, the upper end of the mold core shaft 71 upwardly penetrates the rotation stopping plate 5 and the pressing plate 6, an external thread is arranged on the sidewall of the upper end of the mold core shaft 71, a cooling jacket 72 is arranged in the mold core shaft 71, the mold core shaft 71 is rotatably connected with the cooling jacket 72, the cooling jacket 72 is fixedly arranged on the die holder 1, a top sleeve is slidably sleeved on the mold core shaft 71, the top sleeve comprises an inner sliding sleeve body 73 and an outer sliding sleeve body 74, the inner sliding sleeve body 73 is arranged on the rotation stopping plate 5 in an interference manner, the inner sliding sleeve body 73 is slidably sleeved on the mold core shaft 71, the outer sliding sleeve body 74 is slidably arranged on the outer sidewall of the inner sliding sleeve body 73, and the outer sliding sleeve body 74 is arranged in the pressing plate 6 in an interference manner.

[0016] Four screw sleeve 52 are arranged around the rotation stop plate 5, four top shaft gear 43 are arranged rotatably between the lower rotation plate 2 and the upper rotation plate 3, the gear ring on each top shaft gear 43 is located in the cavity 4 and meshes with the gear ring on the corresponding mold core gear 7, a top shaft 431 is arranged coaxially on the top shaft gear 43, a transmission thread is arranged on the top shaft 431, the top shaft 431 passes through the upper rotation plate 3, and the transmission thread on the top shaft 431 is in threaded connection with the internal thread of the screw sleeve 52. The connecting structure between the clamp plate 6 and the rotation stop plate 5 is that four limiting grooves 61 are arranged on the bottom wall around the clamp plate 6, four connecting grooves are arranged around the rotation stop plate 5, a limiting sleeve 51 is fixed in the connecting groove, the limiting sleeve 51 extends upward out of the connecting groove, a mounting hole is arranged on the bottom wall of the connecting groove, a screw sleeve 52 is arranged rotatably in the mounting hole, an external gear ring is arranged on the outer side wall of the screw sleeve 52, an adjusting sleeve 53 is clamped in the mounting hole, an internal gear ring is arranged on the inner side wall of the adjusting sleeve 53, the external gear ring on the screw sleeve 52 meshes with the internal gear ring on the adjusting sleeve 53, the limiting sleeve 51 abuts against the adjusting sleeve 53 and the screw sleeve 52, a plurality of waist-shaped holes 531 are uniformly distributed around the adjusting sleeve 53, and a countersunk head bolt passes through the waist-shaped hole 531 and is connected with the rotation stop plate 5; when the clamp plate 6 abuts against the rotation stop plate 5, the four limiting sleeves 51 on the rotation stop plate 5 are clamped into the four limiting grooves 61 on the clamp plate 6.

[0017] When injection molding, as Figure 3As shown, the upper die abuts against the clamp plate 6 of the lower die, and the upper die and the mold core shaft 71 and the top sleeve on the mold core shaft 71 form a molding cavity, which is injected with plastic to form a threaded cap after the plastic is injected into the molding cavity, and the upper die and the lower die are opened after the molding is completed, the rack 41 is driven, the pinion 422 in the double-row gear 42 is rotated by the rack 41, the large gear 421 on the double-row gear 42 is synchronously rotated, the mold core gear 7 meshing with the large gear 421 on the double-row gear 42 is rotated, the mold core shaft 71 connected with the mold core gear 7 rotates with the threaded cap, and the mold core gear 7 rotates with the top shaft gear 43 meshing with the mold core gear 7, the top shaft gear 43 drives the top shaft 431 and the screw sleeve 52 to generate a threaded transmission force when the top shaft gear 43 rotates, the screw sleeve 52 and the adjusting sleeve 53 are meshed, the waist-shaped hole 531 is arranged on the adjusting sleeve 53, and the screw sleeve 52 rotates with the adjusting sleeve 53 under the threaded transmission of the top shaft 431, when the adjusting sleeve 53 rotates to the waist-shaped hole 531 abutting against the countersunk head bolt, the screw sleeve 52 and the adjusting sleeve 53 are no longer rotated, the stop plate 5 and the clamp plate 6 are lifted under the threaded transmission of the screw sleeve 52 and the top shaft 431, the inner sleeve body 73 and the outer sleeve body 74 in the top sleeve are abutted against the threaded cap when the stop plate 5 and the clamp plate 6 move upward, the threaded cap stops rotating under the friction force after being abutted against, the mold core shaft 71 continues to rotate, the mold core shaft 71 is rotated with the threaded cap, and the stop plate 5 and the clamp plate 6 continue to move upward, the inner sleeve body 73 and the outer sleeve body 74 are lifted to eject the threaded cap rotated with the mold core shaft 71, the waist-shaped hole 531 arranged on the adjusting sleeve 53 can drive the threaded cap to rotate first, the inner sleeve body 73 and the outer sleeve body 74 are lifted to abut against the threaded cap to apply a stable friction force to the threaded cap when the threaded cap rotates at a constant speed, and the threaded cap is prevented from being damaged due to a large friction force between the threaded cap and the inner sleeve body 73 and the outer sleeve body 74 when the threaded cap starts to rotate.

[0018] Finally, it should be noted that the above embodiments are used to illustrate the technical solutions of the present application, but not to limit the present application. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that the specific embodiments of the present application can be modified or replaced, and any modification or replacement without departing from the spirit and scope of the present application should be covered in the protection scope of the claims of the present application.

Claims

1. A lower mold capable of stable demolding in a spin cap injection mold, characterized in that: The utility model relates to a mould base, which comprises a lower rotating plate and an upper rotating plate arranged on the mould base, a cavity left between the lower rotating plate and the upper rotating plate, a stop plate movably arranged on the upper rotating plate, a pressing plate movably arranged on the stop plate, a rack slidably arranged in the cavity, a plurality of double-row gears rotatably arranged between the lower rotating plate and the upper rotating plate, a large gear ring and a small gear ring of each double-row gear located in the cavity, the small gear ring of each double-row gear meshing with the rack, a plurality of mould core gears rotatably arranged between the lower rotating plate and the upper rotating plate, a gear ring of each mould core gear located in the cavity and meshing with the large gear ring of the corresponding double-row gear, a mould core shaft coaxially arranged on each mould core gear, the upper end of the mould core shaft penetrating through the stop plate and the pressing plate, an external thread arranged on the sidewall of the upper end of the mould core shaft, a top sleeve slidably arranged on the mould core shaft, four screw sleeve sleeves arranged around the stop plate, and four top shaft gears rotatably arranged between the lower rotating plate and the upper rotating plate, a gear ring of each top shaft gear located in the cavity and meshing with the gear ring of the corresponding mould core gear, a top shaft coaxially arranged on each top shaft gear, a transmission thread arranged on the top shaft, the top shaft penetrating through the upper rotating plate, and the transmission thread on the top shaft threadedly connected with the internal thread of the screw sleeve. The connecting structure between the pressing plate and the stop plate comprises four limiting grooves arranged on the bottom wall around the pressing plate, four connecting grooves arranged around the stop plate, a limiting sleeve fixed in each connecting groove and upwardly protruding from the connecting groove, an installation hole arranged on the bottom wall of each connecting groove, a screw sleeve movably arranged in each installation hole, an external gear ring arranged on the outer sidewall of each screw sleeve, an adjusting sleeve arranged in each installation hole, an internal gear ring arranged on the inner sidewall of each adjusting sleeve, the external gear ring on each screw sleeve meshing with the internal gear ring on the corresponding adjusting sleeve, the limiting sleeve abutting against the adjusting sleeve and the screw sleeve, a plurality of waist-shaped holes circumferentially distributed on each adjusting sleeve, and a countersunk head bolt penetrating through each waist-shaped hole and connected with the stop plate.

2. The lower mold of the spin-on cap injection mold capable of stable demolding according to claim 1, characterized in that: The top sleeve comprises an inner sliding sleeve body and an outer sliding sleeve body, the inner sliding sleeve body is arranged on the stop plate in an interference fit, the outer sliding sleeve body is slidably arranged on the outer sidewall of the inner sliding sleeve body, and the outer sliding sleeve body is arranged in the pressing plate in an interference fit.

3. The lower mold of the spin-on cap injection mold capable of stable demolding according to claim 1, characterized in that: A cooling sleeve is arranged in the mould core shaft, the mould core shaft is rotatably connected with the cooling sleeve, and the cooling sleeve is fixed on the mould base.

4. The lower mold of the spin-on cap injection mold capable of stable demolding according to claim 3, characterized in that: A rotating shaft is fixedly arranged in the mould base, the rotating shaft upwardly protrudes from the lower rotating plate and abuts against the upper rotating plate, and the double-row gears are rotatably arranged on the rotating shaft.

5. The lower mold of the spin-on cap injection mold capable of stable demolding according to claim 4, characterized in that: The large gear ring of each double-row gear meshes with four mould core gears, and the four mould core gears are symmetrically arranged on the front and back sides of the double-row gear.

6. The lower mold of the spin-on cap injection mold with stable demolding, according to claim 1, wherein: ​

Images