Mold structure for extrusion molding of plastic bottle cap

文档序号:592 发布日期:2021-09-17 浏览:39次 中文

1. The utility model provides a be used for plastic bottle lid extrusion moulding's mould structure which characterized in that: the plastic bottle cap comprises a screw cap (1) and a threaded cap (2); the screw cap (1) and the screw cap (2) are both in cap shapes, the screw cap (2) comprises a seat cap (201) and a threaded part (202), and the threaded part (202) is annular and is connected to the lower edge of the seat cap (201); the rotary cover (1) is rotationally connected to the seat cover (201);

the die structure comprises an upper platform (4), a middle platform (5), a lower platform (6), a screw cap inner cavity forming assembly and a threaded cap inner cavity forming assembly; the upper platform (4) and the lower platform (6) are respectively arranged above and below the middle platform (5); a cover-screwing type groove (401) and a thread cover type groove (402) are arranged on the upper platform (4); a first hole site (501) and a second hole site (502) are arranged on the middle platform (5); the screw cap inner cavity forming assembly and the threaded cap inner cavity forming assembly are both arranged on the lower platform (6); when the upper platform (4), the middle platform (5) and the lower platform (6) are mutually overlapped, the screw cap inner cavity forming assembly penetrates through the first hole position (501) and is matched with the screw cap type groove (401) to form a first cavity for extrusion forming of the screw cap (1), and the screw cap inner cavity forming assembly penetrates through the second hole position (502) and is matched with the screw cap type groove (402) to form a second cavity for extrusion forming of the screw cap (2);

when the upper platform (4), the middle platform (5) and the lower platform (6) are separated from each other, the upper hole edge of the first hole site (501) is abutted against the edge of the formed screw cap (1) so as to separate the screw cap inner cavity forming assembly from the screw cap (1); the upper hole edge of the second hole site (502) is abutted against the edge of the molded threaded cover (2) so as to separate the threaded cover inner cavity molding component from the threaded cover (2).

2. The mold structure for extrusion molding of plastic bottle cap according to claim 1, wherein: the middle of the screw cap (1) is provided with a tubular hollow shaft (102), the hollow shaft (102) can penetrate through the threaded cap (2), and the screw cap (1) rotates by taking the hollow shaft (102) as a center.

3. The mold structure for extrusion molding of plastic bottle cap according to claim 2, wherein: the screw cap inner cavity forming assembly comprises a first inner core (601), a first compression spring (603) and a first forming seat (604); the first forming seat (604) is cylindrical, and the upper end of the first forming seat is matched with the shape of the inner bottom surface of the rotary cover (1); the first compression spring (603) is arranged at the bottom of the first forming seat (604) and is abutted between the first forming seat (604) and the lower platform (6), and the middle platform (5) moves downwards for a certain distance and is abutted against the first forming seat (604) to push the first forming seat to move downwards; the first inner core (601) is in a round rod shape and penetrates through the center of the first forming seat (604), the lower end of the first inner core (601) is fixedly connected with the lower platform (6), and the upper end of the first inner core (601) is matched with the first forming seat (604) to form a hollow shaft forming cavity.

4. The mold structure for extrusion molding of plastic bottle cap according to claim 3, wherein: two opposite sides of the free end of the hollow shaft (102) are respectively provided with a tooth, the teeth are provided with clamping convex teeth (103), and the clamping convex teeth (103) radially protrude out of the hollow shaft (102).

5. The mold structure for extrusion molding of plastic bottle cap according to claim 4, wherein: the spiral cover inner cavity forming assembly further comprises an inner core sleeve (602), the inner core sleeve (602) is tubular and is sleeved on the first inner core (601), the lower end of the inner core sleeve (602) is fixedly connected with the lower platform (6), the upper end of the inner core sleeve (602) penetrates into the first forming seat (604) and can be matched with the first inner core (601) and the first forming seat (604) to form a convex tooth forming cavity, and the convex tooth forming cavity is communicated with the hollow shaft forming cavity.

6. The mold structure for extrusion molding of plastic bottle cap according to claim 1, wherein: the screw cap inner cavity forming assembly comprises a second forming seat (605) and a seat cap forming table (609), the second forming seat (605) is in a circular truncated cone shape and is arranged on the lower platform (6), the seat cap forming table (609) is fixedly connected to the second forming seat (605), and the upper end of the seat cap forming table (609) is matched with the inner bottom surface of the screw cap (2) in shape.

7. The mold structure for extrusion molding of plastic bottle cap according to claim 6, wherein: the screw cap inner cavity forming assembly further comprises a push rod (607), a screw forming table (610) and a second compression spring (608); the thread forming table (610) is annular and is arranged between the seat cover forming table (609) and the second forming seat (605), the thread forming table (610) is of an annular structure formed by splicing two trapezoidal pieces (610C) and two C-shaped pieces (610a), the two trapezoidal pieces (610C) are arranged between the two C-shaped pieces (610a), a tightening spring (610d) is arranged on the inner sides of the two C-shaped pieces (610a), and the tightening spring (610d) is used for pulling the two C-shaped pieces (610a) to be close to each other so that the thread forming table (610) can be folded in the radial direction; one side of each trapezoid (610c) close to the tightening spring (610d) is provided with a slope surface, the lower end of the push rod (607) is fixedly connected with the lower platform (6), and the upper end of the push rod (607) penetrates through the second forming seat (605) and abuts against the slope surface; the lower part of the second forming seat (605) is pressed against the lower platform (6) through a second compression spring (608) and can vertically lift, and the thread forming table (610) can vertically lift along with the second forming seat (605) and radially expand when the push rod (607) pushes the ladder-shaped piece (610c) to move.

8. The mold structure for extrusion molding of plastic bottle cap according to claim 7, wherein: the threaded cover (2) further comprises a rotating sleeve (203), and the rotating sleeve (203) is tubular and is coaxially arranged in the center of the seat cover (201).

9. The mold structure for extrusion molding of plastic bottle cap according to claim 8, wherein: the screw cap inner cavity forming assembly further comprises a second inner core (606), the second inner core (606) is in a round rod shape, the lower end of the second inner core (606) is fixedly connected with the lower platform (6), and the upper end of the second inner core (606) can penetrate through the centers of the second forming seat (605) and the seat cap forming platform (609) and abut against the screw cap type groove (402); a sleeve forming cavity for forming the rotating sleeve (203) is formed between the second inner core (606) and the seat cover forming table (609), and the sleeve forming cavity is communicated with the second cavity.

10. The mold structure for extrusion molding of plastic bottle cap according to claim 1, wherein: the die structure further comprises a guide assembly (8), wherein the guide assembly (8) comprises an upper guide spring (801), a guide column (802) and a lower guide spring (803); guide post (802) vertical setting and with lower platform (6) fixed connection, this guide post (802) pass well platform (5) and lower platform (6) and with both sliding connection, go up guide spring (801) cover outside guide post (802) and support between upper platform (4) and well platform (5), lower guide spring (803) fixed cover is outside guide post (802) and support between lower platform (6) and well platform (5).

Background

With the continuous improvement of living standard and production speed of people, people have more and more demands on hollow plastic containers, and the quality requirements on the hollow plastic containers are higher and higher. In plastic extrusion molding equipment, a plastic extruder is generally called as a main machine and is mainly used for plastic extrusion, the plastic extruder is an important plastic machine, most of plastic products can be produced and manufactured by extrusion molding, and after the development of the plastic extruder for more than 100 years, multiple machine types such as double screws, multiple screws and even no screws are derived from the original single screw. Meanwhile, the subsequent equipment matched with the plastic extruder is called an auxiliary machine; the auxiliary machine includes a device for collecting the extruded plastic container, a heating mechanism connected to the input side of the plastic extruder, and the like.

In addition, the mold structure serves as a core part of plastic extrusion molding, and functions to inject molten plastic extruded from a plastic extruder and mold it into a plastic member. As a common part in life, the plastic bottle cap has a very large application range and a large application range, for example, a seasoning bottle cap with a rotating effect has a large application range in life, and therefore, the rotating seasoning bottle cap is usually realized by using a mode of separately forming and then combining during injection molding, when two parts of the seasoning bottle cap need to be formed, different molds need to be replaced, and the mode is not beneficial to the expansion of the production yield of the seasoning bottle cap, so that a device capable of rapidly improving the production effect of the plastic bottle cap needs to be designed.

Disclosure of Invention

In order to solve the problem of low production efficiency of the plastic bottle cap of the conventional seasoning bottle, the scheme provides a mold structure for extrusion molding of the plastic bottle cap.

The technical scheme adopted by the invention is as follows:

a mould structure for plastic bottle cap extrusion molding comprises a screw cap and a thread cap; the screw cap and the threaded cap are both in cap shapes, the threaded cap comprises a base cap and a threaded part, and the threaded part is annular and is connected to the lower edge of the base cap; the rotary cover is rotationally connected to the seat cover;

the die structure comprises an upper platform, a middle platform, a lower platform, a cap screwing inner cavity forming assembly and a threaded cap inner cavity forming assembly; the upper platform and the lower platform are respectively arranged above and below the middle platform; a cover-screwing type groove and a thread cover type groove are arranged on the upper platform; a first hole site and a second hole site are arranged on the middle platform; the screw cap inner cavity forming assembly and the threaded cap inner cavity forming assembly are both arranged on the lower platform; when the upper platform, the middle platform and the lower platform are mutually overlapped, the screw cap inner cavity forming assembly penetrates through the first hole position and is matched with the screw cap type groove to form a first cavity for screw cap extrusion molding, and the screw cap inner cavity forming assembly penetrates through the second hole position and is matched with the screw cap type groove to form a second cavity for screw cap extrusion molding;

when the upper platform, the middle platform and the lower platform are separated from each other, the upper hole edge of the first hole position is abutted against the edge of the formed screw cap, so that the screw cap inner cavity forming assembly is separated from the screw cap; and the upper hole edge of the second hole position is abutted against the edge of the formed threaded cover so as to separate the inner cavity forming component of the threaded cover from the threaded cover.

As an alternative or complementary design to the above solution: the middle part of the screw cap is provided with a tubular hollow shaft which can pass through the screw cap, and the screw cap rotates by taking the hollow shaft as the center.

As an alternative or complementary design to the above solution: the spiral cover inner cavity forming assembly comprises a first inner core, a first compression spring and a first forming seat; the first forming seat is cylindrical, and the upper end of the first forming seat is matched with the shape of the inner bottom surface of the rotary cover; the first compression spring is arranged at the bottom of the first forming seat and is abutted between the first forming seat and the lower platform, and the middle platform moves downwards for a certain distance and then is abutted against the first forming seat and pushes the first forming seat to move downwards; the first inner core is in a round rod shape and penetrates through the center of the first forming seat, the lower end of the first inner core is fixedly connected with the lower platform, and the upper end of the first inner core is matched with the first forming seat to form a hollow shaft forming cavity.

As an alternative or complementary design to the above solution: the two opposite sides of the free end of the hollow shaft are respectively provided with a tooth, the teeth are provided with clamping convex teeth, and the clamping convex teeth radially protrude out of the hollow shaft.

As an alternative or complementary design to the above solution: the spiral cover inner cavity forming assembly further comprises an inner core sleeve, the inner core sleeve is tubular and is sleeved on the first inner core, the lower end of the inner core sleeve is fixedly connected with the lower platform, the upper end of the inner core sleeve penetrates into the first forming seat and can be matched with the first inner core and the first forming seat to form a convex tooth forming cavity, and the convex tooth forming cavity is communicated with the hollow shaft forming cavity.

As an alternative or complementary design to the above solution: the screw cap inner cavity forming assembly comprises a second forming seat and a seat cap forming table, the second forming seat is in a round table shape and is arranged on the lower platform, the seat cap forming table is fixedly connected onto the second forming seat, and the upper end of the seat cap forming table is matched with the inner bottom surface of the screw cap in shape.

As an alternative or complementary design to the above solution: the screw cap inner cavity forming assembly further comprises a push rod, a screw forming table and a second compression spring; the thread forming table is annular and is arranged between the seat cover forming table and the second forming seat, the thread forming table is of an annular structure formed by splicing two trapezoidal pieces and two C-shaped pieces, the two trapezoidal pieces are arranged between the two C-shaped pieces, and tightening springs are arranged on the inner sides of the two C-shaped pieces and are used for pulling the two C-shaped pieces to mutually draw together so as to enable the thread forming table to be radially folded; one sides of the two trapezoidal pieces, which are close to the tightening spring, are provided with slope surfaces, the lower ends of the push rods are fixedly connected with the lower platform, and the upper ends of the push rods penetrate through the second forming seats and are abutted against the slope surfaces; the lower part of the second forming seat is supported on the lower platform through a second compression spring and can vertically lift, and the thread forming table can vertically lift along with the second forming seat and radially expand when the push rod pushes the trapezoidal piece to move.

As an alternative or complementary design to the above solution: the screw cap further comprises a rotating sleeve which is tubular and is coaxially arranged in the center of the seat cap.

As an alternative or complementary design to the above solution: the inner cavity forming assembly of the threaded cover further comprises a second inner core, the second inner core is in a round rod shape, the lower end of the second inner core is fixedly connected with the lower platform, and the upper end of the second inner core can penetrate through the centers of the second forming seat and the seat cover forming table and is abutted to the groove of the threaded cover; and a sleeve forming cavity for forming the rotary sleeve is formed between the second inner core and the seat cover forming table, and the sleeve forming cavity is communicated with the second cavity.

As an alternative or complementary design to the above solution: the die structure also comprises a guide assembly, wherein the guide assembly comprises an upper guide spring, a guide post and a lower guide spring; the guide post is vertically arranged and fixedly connected with the lower platform, the guide post penetrates through the middle platform and the lower platform and is in sliding connection with the middle platform and the lower platform, the upper guide spring is sleeved outside the guide post and abuts against between the upper platform and the middle platform, and the lower guide spring is fixedly sleeved outside the guide post and abuts against between the lower platform and the middle platform.

The invention has the beneficial effects that:

1. on one hand, the production efficiency is improved by accelerating the demoulding speed of the plastic bottle cap, the middle platform can lift the formed plastic bottle cap upwards, so that the rotary cap or the threaded cap can complete demoulding with the rotary cap inner cavity forming assembly and the threaded cap inner cavity forming assembly, the rotary cap or the threaded cap is supported by the middle platform after demoulding, and meanwhile, because the contact part of the rotary cap or the threaded cap and the middle platform is few, the rotary cap or the threaded cap on the middle platform can be blown off by strong wind, and the forming speed of the bottle cap is effectively accelerated;

2. the screw cap inner cavity forming assembly in the scheme can be formed into a hollow shaft and clamping convex teeth through the combination of the first inner core, the inner core sleeve, the first compression spring, the first forming seat and the like, and the first forming seat can move up and down, so that the formed hollow shaft and clamping convex teeth can rapidly complete demoulding from the screw cap inner cavity forming assembly;

3. finally, the screw cap inner cavity forming assembly in the scheme can quickly form a forming space of structures such as a seat cap, a screw thread part, a rotary sleeve and the like through the matching of structures such as a second forming seat, a seat cap forming table and a screw thread forming table, and the screw thread forming table can radially draw in or stretch out an annular structure, so that internal threads can be conveniently formed;

4. through the mould structure in this scheme can make two parts synchronous shaping of the plastics bottle lid of condiment bottle, reduce the work load of follow-up processing, improve the shaping speed and the efficiency of plastics bottle lid.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.

Fig. 1 is a structural schematic diagram of a mold structure for extrusion molding of a plastic bottle cap in the scheme;

fig. 2 is a schematic view of a plastic bottle cap to be extrusion molded according to the present embodiment;

FIG. 3 is a structure diagram of the first inner core, the inner core sleeve and the first forming seat;

FIG. 4 is a matching structure diagram of the second forming seat, the second inner core, the push rod, the thread forming table, the seat cover forming table and other components in the scheme;

fig. 5 is a bottom view of the screw forming table according to the present embodiment.

In the figure: 1-screwing a cover; 101-a cover plate body; 102-a hollow shaft; 103-clamping convex teeth; 2-a screw cap; 201-seat cover; 202-a threaded portion; 203-rotating the sleeve; 3-an injection molding head; 4-upper platform; 401-cover turning type groove; 402-screw cap type groove; 5-a mid-platform; 501-a first hole site; 502-second hole site; 6-lower platform; 601-a first inner core; 602-inner core sleeve; 603-a first compression spring; 604-a first forming base; 605-a second forming bed; 606-a second inner core; 607-a push rod; 608-a second compression spring; 609-seat cover forming table; 610-a thread forming table; 610a-C shaped piece; 610 b-push slot; 610 c-ladder; 610 d-take up spring; 7-a base; 8-a guide assembly; 801-upper guide spring; 802-a guide post; 803-lower guide spring.

Detailed Description

The technical solutions in the embodiments will be described clearly and completely with reference to the accompanying drawings, and the described embodiments are only a part of the embodiments, but not all embodiments, and all other embodiments obtained by those skilled in the art without creative efforts will belong to the protection scope of the present solution based on the embodiments in the present solution.

Example 1

As shown in fig. 2, the present embodiment is designed to have a plastic cap structure including a screw cap 1 and a screw cap 2.

The screw cap 1 is in a cap shape, the screw cap 1 comprises a cap body 101, a hollow shaft 102 and a locking convex tooth 103, the hollow shaft 102 is coaxially connected to the center of the cap body 101, the hollow shaft 102 is in a hollow tubular shape, and when the hollow shaft 102 penetrates through the screw cap 2, the screw cap 1 rotates by taking the hollow shaft 102 as the center. Two opposite sides of the free end of the hollow shaft 102 are respectively provided with a tooth, the teeth are provided with a locking convex tooth 103, and the locking convex tooth 103 radially protrudes out of the hollow shaft 102. The clamping convex teeth 103 can be clamped on the threaded cover 2, so that the screw cover 1 is prevented from falling off in the rotating process.

The screw cap 2 is in a cap shape, and the screw cap 2 includes a base cap 201, a screw portion 202, and a rotating sleeve 203, the screw portion 202 is in a ring shape and is connected at a lower edge of the base cap 201, and an internal thread integrally formed with the screw portion 202 is provided at a circumferential inner side of the screw portion 202 so that the screw portion 202 can be screwed to the seasoning bottle. The rotating sleeve 203 is tubular and coaxially arranged at the center of the seat cover 201, the hollow shaft 102 of the screw cover 1 penetrates through the rotating sleeve 203, so that the screw cover 1 and the screw cover 2 are mutually rotatably connected, and meanwhile, the clamping convex teeth 103 on the screw cover 1 are buckled at the lower edge of the rotating sleeve 203, and the hollow shaft 102 is prevented from sliding out of the rotating sleeve 203.

Example 2

As shown in fig. 1 to 3, the present embodiment provides a mold structure for injection molding of the screw cap 1 in embodiment 1, and the mold structure includes an upper platform 4, a middle platform 5, a lower platform 6 and a screw cap inner cavity forming assembly. The upper and lower stages 4 and 6 are disposed above and below the middle stage 5, respectively.

A spiral cover type groove 401 is formed in the upper platform 4, a first hole position 501 is formed in the middle platform 5, a spiral cover inner cavity forming assembly is arranged on the lower platform 6, the upper platform 4 and the middle platform 5 can vertically lift, and when the upper platform 4, the middle platform 5 and the lower platform 6 are mutually overlapped, the spiral cover inner cavity forming assembly penetrates through the first hole position 501 and is matched with the spiral cover type groove 401 to form a first cavity for extrusion forming of the cover disc body 101 part of the spiral cover 1; when the upper platform 4, the middle platform 5 and the lower platform 6 are separated from each other, the upper hole edge of the first hole site 501 abuts against the edge of the formed screw cap 1, so that the screw cap inner cavity forming assembly is separated from the screw cap 1.

In order to ensure the injection molding of the hollow shaft 102 of the screw cap 1, the screw cap inner cavity molding assembly comprises a first inner core 601, a first compression spring 603 and a first molding seat 604; the first forming seat 604 is cylindrical, and the upper end of the first forming seat is matched with the shape of the inner bottom surface of the screw cap 1; the first compression spring 603 is arranged at the bottom of the first forming seat 604 and is abutted between the first forming seat 604 and the lower platform 6, and the middle platform 5 moves downwards for a certain distance and is abutted against the first forming seat 604 to push the first forming seat to move downwards; the first inner core 601 is in a round rod shape and penetrates through the center of the first forming seat 604, the lower end of the first inner core 601 is fixedly connected with the lower platform 6, the upper end of the first inner core 601 can be matched with the first forming seat 604 to form a hollow shaft forming cavity, and the hollow shaft forming cavity is communicated with the first cavity. When the upper platform 4, the middle platform 5 and the lower platform 6 are mutually closed and overlapped, the first forming seat 604 moves downwards and is abutted to the lower platform 6, the first compression spring 603 below the first forming seat 604 is in a compressed state, the upper center of the first forming seat 604 is matched with the first inner core 601 to form a circular tubular hollow shaft forming cavity, and when molten plastic is injected into the first cavity, the hollow shaft forming cavity can form a tubular hollow shaft 102; when the upper platform 4, the middle platform 5 and the lower platform 6 are separated from each other, the first forming seat 604 can move upwards under the thrust of the first compression spring 603, so that the first inner core 601 is demolded from the inside of the formed hollow shaft 102; when the first forming seat 604 rises to the highest position, the middle platform 5 can still move upwards continuously, meanwhile, the upper hole edge of the first hole position 501 is abutted against the edge of the formed spiral cover 1, so that the middle platform 5 can push the formed spiral cover 1 to move upwards, in the process, the inner bottom surface of the spiral cover 1 and the first forming seat 604 are demolded, and when the upper platform 4 moves upwards to the highest position, the spiral cover 1 is completely separated from the whole spiral cover inner cavity forming assembly.

In addition, in order to ensure the formation of the structure of the clamping convex teeth 103, the screw cap inner cavity forming assembly further comprises an inner core sleeve 602, the inner core sleeve 602 is tubular and is sleeved on the first inner core 601, the lower end of the inner core sleeve 602 is fixedly connected with the lower platform 6, the upper end of the inner core sleeve 602 penetrates into the first forming seat 604 and can be matched with the first inner core 601 and the first forming seat 604 to form a convex tooth forming cavity, and the convex tooth forming cavity is communicated with the hollow shaft forming cavity. When the upper platform 4, the middle platform 5 and the lower platform 6 are mutually closed and overlapped, the upper center of the first molding base 604 is matched with the crossed position of the first inner core 601 and the inner core sleeve 602 to form a convex tooth molding cavity, the convex tooth molding cavity is positioned at the lower end of the hollow shaft molding cavity and communicated with the hollow shaft molding cavity, and when molten plastic is injected into the first cavity, a clamping convex tooth 103 is formed in the convex tooth molding cavity. When the upper platform 4, the middle platform 5 and the lower platform 6 are separated from each other, the first forming seat 604 can move upwards under the thrust of the first compression spring 603, so that the first inner core 601 is demolded from the inside of the formed hollow shaft 102; when the first forming seat 604 is lifted to the highest position, the first inner core 601 is separated from the hollow shaft 102, the middle platform 5 can also move upwards continuously and push the formed screw cap 1 to move upwards, in the process, the clamping convex teeth 103 can contract inwards and are demoulded with the first forming seat 604, and when the upper platform 4 moves upwards to the highest position, the screw cap 1 is completely separated from the whole screw cap inner cavity forming assembly.

Example 3

As shown in fig. 1, 2, 4 and 5, the present embodiment designs a mold structure for injection molding of the screw cap 2 in embodiment 1, which includes an upper platform 4, a middle platform 5, a lower platform 6 and a screw cap inner cavity forming assembly. The upper and lower stages 4 and 6 are disposed above and below the middle stage 5, respectively.

A threaded cover groove 402 is arranged on the upper platform 4; a second hole position 502 is arranged on the middle platform 5; the inner cavity forming components of the threaded cap are all arranged on the lower platform 6; when the upper platform 4, the middle platform 5 and the lower platform 6 are mutually overlapped, the screw cap inner cavity forming assembly passes through the second hole position 502 and is matched with the screw cap type groove 402 to form a second cavity for extrusion forming of the screw cap 2; when the upper platform 4, the middle platform 5 and the lower platform 6 are separated from each other, the upper hole edge of the second hole position 502 abuts against the edge of the formed threaded cover 2, so that the threaded cover inner cavity forming assembly is separated from the threaded cover 2.

In order to ensure the formation of the seat cover of the screw cover 2, the screw cover inner cavity forming assembly comprises a second forming seat 605 and a seat cover forming table 609, the second forming seat 605 is in a circular truncated cone shape and is arranged on the lower platform 6, the seat cover forming table 609 is fixedly connected to the second forming seat 605, and the upper end of the seat cover forming table 609 is matched with the inner bottom surface of the screw cover 2 in shape. When the upper platen 4 is moved down to the lowermost position, the upper end surface of the seat cover forming table 609 is inserted into the threaded cover forming groove 402, and the two cooperate to form a seat cover forming cavity for seat cover forming, which is a part of the second chamber.

In order to ensure the formation of the threaded part 202 of the threaded cap 2, the threaded cap cavity forming assembly further comprises a push rod 607, a thread forming table 610 and a second compression spring 608; the thread forming table 610 is annular and is arranged between the seat cover forming table 609 and the second forming seat 605, the thread forming table 610 is an annular structure formed by splicing two trapezoidal pieces 610C and two C-shaped pieces 610a, the two trapezoidal pieces 610C are arranged between the two C-shaped pieces 610a, a tightening spring 610d is arranged on the inner side of the two C-shaped pieces 610a, and the tightening spring 610d is used for pulling the two C-shaped pieces 610a to close to each other so that the thread forming table 610 can be radially folded; a slope surface is arranged on one side of each trapezoid 610c close to the tightening spring 610d, the lower end of the push rod 607 is fixedly connected with the lower platform 6, and the upper end of the push rod 607 penetrates through the second forming seat 605 and abuts against the slope surface; the lower part of the second forming base 605 is pressed against the lower platform 6 by a second compression spring 608 and can be lifted vertically, and the thread forming table 610 can be lifted vertically with the second forming base 605 and can be expanded radially when the push rod 607 pushes the ladder 610c to move. When the upper platform 4, the middle platform 5 and the lower platform 6 are mutually closed and overlapped, the second forming seat 605 moves downwards and is abutted to the lower platform 6, the second compression spring 608 below the second forming seat 605 is in a compressed state, and the seat cover forming table on the upper part of the second forming seat 605 is matched with the thread cover forming groove 402 to form a seat cover forming cavity. Meanwhile, the upper end of the push rod 607 aligns with the push groove 610b on the slope of the trapezoid 610c, the push rod 607 can push the trapezoid 610c to move outwards, the small end of the trapezoid 610c faces outwards, so that the thread forming table 610 is unfolded into a complete circular ring shape, the outer side of the thread forming table 610 is provided with threads, the thread forming table 610 can cooperate with the thread cover 2 forming cavity to form a thread forming cavity, and the seat cover forming cavity and the thread forming cavity together form the second cavity; when the upper platform 4, the middle platform 5 and the lower platform 6 are separated from each other, the second forming seat 605 can move up under the thrust of the second compression spring 608, so that the second forming seat 605, the seat cover forming table and the thread forming table 610 move up, and the thread forming table 610 contracts inwards under the tension of the tightening spring 610d, so that the thread forming table 610 can be demolded from the formed thread part 202, when the second forming seat 605 moves up to the highest position, the middle platform 5 can move up continuously, and simultaneously, because the upper hole edge of the second hole position 502 is abutted against the edge of the formed thread cover 2, the middle platform 5 can push the formed thread cover 2 to move up, in the process, the seat cover of the thread cover 2 is demolded from the seat cover forming table, and when the upper platform 4 moves up to the highest position, the thread cover 2 is completely separated from the whole thread cover inner cavity forming assembly.

In order to ensure the formation of the rotating sleeve 203 at the center of the threaded cap 2, the threaded cap inner cavity forming assembly further comprises a second inner core 606, the second inner core 606 is in a round rod shape, the lower end of the second inner core 606 is fixedly connected with the lower platform 6, and the upper end of the second inner core 606 can penetrate through the centers of the second forming seat 605 and the seat cap forming table 609 and abut against the threaded cap groove 402; a sleeve-forming cavity for forming the rotating sleeve 203 is formed between the second inner core 606 and the seat cover forming station 609, and the sleeve-forming cavity communicates with the second chamber. When the upper platform 4, the middle platform 5 and the lower platform 6 are mutually closed and overlapped, the second forming seat 605 moves downwards and is abutted to the lower platform 6, the second compression spring 608 below the second forming seat 605 is in a compressed state, the upper center of the second forming seat 605 is matched with the second inner core 606 to form a circular-tube-shaped sleeve forming cavity, and when molten plastic is injected into the second cavity, the tubular rotary sleeve 203 can be formed in the sleeve forming cavity; when the upper platform 4, the middle platform 5 and the lower platform 6 are separated from each other, the second forming seat 605 can move upwards under the thrust of the second compression spring 608, so that the second inner core 606 is demoulded from the inside of the formed rotating sleeve 203; when the second forming base 605 rises to the highest position, the middle platform 5 will move upwards continuously, and meanwhile, the upper hole edge of the second hole position 502 is abutted against the edge of the formed threaded cover 2, so that the middle platform 5 can push the formed threaded cover 2 to move upwards, and in the process, the inner bottom surface of the threaded cover 2 and the base cover forming base are demolded.

Example 4

As shown in fig. 1 to 5, the present embodiment designs a mold structure for extrusion molding of a plastic bottle cap in embodiment 1, where the mold structure includes an upper platform 4, a middle platform 5, a lower platform 6, a cap screwing inner cavity molding assembly, a screw cap inner cavity molding assembly, and a guide assembly 8; the screw cap inner cavity forming assembly is of the same structure as that of the embodiment 2, the screw cap inner cavity forming assembly is of the same structure as that of the embodiment 3, and the upper platform 4 and the lower platform 6 are respectively arranged above and below the middle platform 5; a screw cap type groove 401 and a screw cap type groove 402 are provided on the upper platform 4. The bottom of the lower platform is provided with a flat-plate-shaped base 7.

A first hole position 501 and a second hole position 502 are arranged on the middle platform 5; the cap screwing inner cavity forming assembly and the threaded cap inner cavity forming assembly are both arranged on the lower platform 6; when the upper platform 4, the middle platform 5 and the lower platform 6 are mutually overlapped, the screw cap inner cavity forming assembly passes through the first hole position 501 and is matched with the screw cap type groove 401 to form a first cavity for extrusion forming of the screw cap 1, and the screw cap inner cavity forming assembly passes through the second hole position 502 and is matched with the screw cap type groove 402 to form a second cavity for extrusion forming of the screw cap 2; when the upper platform 4, the middle platform 5 and the lower platform 6 are separated from each other, the upper hole edge of the first hole site 501 abuts against the edge of the formed screw cap 1, so that the screw cap inner cavity forming assembly is separated from the screw cap 1; the upper hole edge of the second hole position 502 is abutted against the edge of the formed threaded cover 2, so that the inner cavity forming component of the threaded cover is separated from the threaded cover 2.

The guide assembly 8 comprises an upper guide spring 801, a guide column 802 and a lower guide spring 803; the guide posts 802 are vertically arranged and fixedly connected with the lower platform 6, the guide posts 802 penetrate through the middle platform 5 and the lower platform 6 and are connected with the middle platform 5 and the lower platform 6 in a sliding mode, the upper guide springs 801 are sleeved outside the guide posts 802 and abut against between the upper platform 4 and the middle platform 5, and the lower guide springs 803 are fixedly sleeved outside the guide posts 802 and abut against between the lower platform 6 and the middle platform 5.

The upper part of the upper platform 4 is also connected with an injection molding head 3, the injection molding head 3 is used for connecting a plastic extruder and conveying plastic in a molten state, an injection molding channel is arranged in the upper platform 4, the injection molding channel is communicated with the injection molding head 3, and the plastic in the molten state is filled into the first cavity and the second cavity.

The above examples are merely for clearly illustrating the examples and are not intended to limit the embodiments; and are neither required nor exhaustive of all embodiments. And obvious variations or modifications of this technology may be resorted to while remaining within the scope of the technology.

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