CN214521635U - Take USB mouth not to have mould drawing inclination injection moulding product's mould - Google Patents

Abstract

The utility model relates to the technical field of dies, in particular to a die with a USB port and without draft angle injection molding products, which comprises an upper die component, a lower die component, a glue inlet component, a push rod component and a die core, wherein the upper die component and the lower die component are mutually matched; the USB profiling mechanism is characterized in that the mold core comprises an upper mold core and a lower mold core, a cavity penetrating through the upper end and the lower end is arranged on the upper mold core, a cavity body sleeved in the cavity is arranged at the upper end of the lower mold core, and a USB profiling block is arranged at the upper end of the cavity body; through the structure, the demolding operation without draft can be completed, the water gap position can be automatically broken, the flaws are left in the upper cover after the breaking, the appearance of the upper cover is not affected, and the production efficiency and the quality of the upper cover can be improved.

Description

Take USB mouth not to have mould drawing inclination injection moulding product's mould

Technical Field

The utility model relates to the technical field of mold, specifically be a take USB mouth not have draft injection moulding product's mould.

Background

With the continuous progress and development of science and technology, intelligent equipment covers all industries, at present, when the intelligent equipment is used, the intelligent equipment needs to be powered or charged, taking a mobile phone as an example, when the mobile phone is charged, a charger needs to be used, a shell used by the charger is formed by adopting mold injection molding, and comprises a base with a fixed circuit and an upper cover arranged on the base, wherein a USB port is arranged on the upper cover and used for connecting a USB wire; however, the adoption of the slide leads to the problems of complex structure, high precision requirement, complex mold saving process, high cost and the like of the mold, the adoption of the inclination processing leads to larger volume and smaller volume of the product, and the upper cover with the inclination is difficult to stack and arrange in the production and processing process and is not beneficial to batch packaging;

in the prior art, when the upper cover is manufactured through a mold, a sprue, namely a water gap, needs to be arranged outside a product, and water gap shearing treatment needs to be carried out after mold opening, so that the product generates flaws at the position of the water gap after water gap shearing, the appearance is affected, if the flaws need to be removed, the grinding and polishing process is needed, the trouble is caused, and the manufacturing cost of the product is greatly increased;

in order to solve the above problems, the prior art proposes the following announcement numbers: CN206953443 discloses a mold for product appearance without draft angle, but the mold can only solve the problem of outer surface flaw and can not solve the trouble caused by line position; in view of the above, it is necessary to provide a technical solution to solve the above problems.

SUMMERY OF THE UTILITY MODEL

The utility model discloses an it is not enough to overcome above-mentioned condition, aims at providing the technical scheme that can solve above-mentioned problem.

In order to achieve the above object, the utility model provides a following technical scheme: a mold for a draft-free injection molding product with a USB port comprises an upper mold component, a lower mold component, a glue inlet component, a push rod component and a mold core, wherein the upper mold component and the lower mold component are matched with each other; the upper die assembly is provided with a cavity body which is sleeved with the cavity body, the lower die assembly is provided with a USB profiling block, and a water gap profiling groove is arranged at the side position of the USB profiling block on the cavity body; the glue inlet assembly is provided with a glue inlet channel butted with the water gap profiling groove, and the lower end surface of the glue inlet assembly is in sealing fit with the upper end of the upper die core; the upper die assembly is provided with a first die cavity for mounting an upper die core and a glue inlet cavity positioned at the upper end of the first die cavity, the glue inlet assembly is arranged on the glue inlet cavity, and the glue inlet assembly is in butt joint with the upper die core; the upper die assembly is also provided with an air blowing pipe which is communicated with the glue inlet cavity.

Preferably, all be provided with the spacing hole of sliding on last mould subassembly and the lower mould subassembly, be provided with the slip gag lever post in the spacing hole of sliding, go up mould subassembly and lower mould subassembly and mutually support through the slip gag lever post.

Preferably, the upper die assembly comprises a panel, a first water gap plate, a second water gap plate and an upper die mounting plate, the glue inlet assembly comprises a sprue profiling block, a sprue channel profiling block, a waste residue discharging block and a water gap cutting block, the panel, the first water gap plate, the second water gap plate and the upper die mounting plate are combined from top to bottom through a sliding limiting rod, and the glue inlet channel is arranged on the sprue profiling block, the sprue channel profiling block, the waste residue discharging block and the water gap cutting block in a penetrating manner; the first die core cavity is arranged at the lower end of the upper die mounting plate, the glue inlet cavity is arranged at the upper end of the upper die mounting plate, and the glue inlet cavity is upwards communicated with the second water gap plate, the first water gap plate and the panel; the sprue profiling block and the sprue channel profiling block are both arranged in the glue inlet cavity on the panel, the lower end of the sprue profiling block is in butt joint fit with the upper end of the sprue profiling block, and the lower part of the sprue profiling block is in sliding fit with the glue inlet cavity on the first nozzle plate; the waste residue unloading block is arranged in a glue inlet cavity on the first nozzle plate, the upper end of the waste residue unloading block is in butt joint with the lower end of the sprue imitation block, the lower part of the waste residue unloading block is in sliding fit with the glue inlet cavity on the second nozzle plate, the water gap cutting block is arranged in the glue inlet cavity on the second nozzle plate, the upper end of the water gap cutting block is in butt joint with the lower end of the waste residue unloading block, the lower part of the water gap cutting block is in sliding fit with the glue inlet cavity on the upper die mounting plate, and the lower end of the water gap cutting block is in butt joint with the upper end of the upper die core.

Preferably, the lower die assembly comprises a bottom plate, supporting square iron and a lower die mounting plate, the supporting square iron is fixedly mounted on the bottom plate, the sliding limiting rod is arranged on the supporting square iron, and the lower die mounting plate is limited on the supporting square iron through the sliding limiting rod; a second die cavity for mounting a lower die core and a telescopic through hole for connecting the push rod assembly are arranged on the lower die mounting plate; the push rod assembly comprises a thimble fixing plate, a push rod, a push block and a driving mechanism, the driving mechanism is fixedly installed on the lower die installation plate, the thimble fixing plate is in power connection with the driving mechanism, the push rod is installed on the thimble fixing plate and is in sliding connection with the telescopic through hole, and the push block is arranged at the upper end of the push rod and corresponds to the lower end of the cavity.

Preferably, the lower die assembly further comprises a push plate, the push plate is limited between the lower die mounting plate and the upper die mounting plate through a sliding limiting rod, a third die cavity chamber in sliding fit with the lower die core is arranged on the push plate, and the upper end of the third die cavity chamber corresponds to the lower end of the die cavity body.

Compared with the prior art, the beneficial effects of the utility model are as follows:

according to the rubber injection molding machine, an upper die assembly, a lower die assembly, a rubber inlet assembly, a push rod assembly and a die core are adopted, a rubber inlet cavity is arranged on the upper die assembly, and a through air blowing pipe is arranged on the side part of the rubber inlet cavity; the mold core is provided with an upper mold core with a mold cavity and a lower mold core with a mold cavity, a USB profiling block is arranged at the upper end of the mold cavity, a water gap profiling groove is formed in the side position of the USB profiling block on the mold cavity, a protruding part connected with a water gap is formed inwards at the USB port position of the upper cover after injection molding, when mold opening is carried out, the glue inlet assembly firstly ascends, the water gap position is broken, and flaws are left at the protruding part without affecting the appearance of the upper cover; after the water gap is broken, blowing gas into the gas blowing pipe to ensure that no sticking is generated between the formed upper cover and the upper mold core; through the structure, the demolding operation without draft can be completed, the water gap position can be automatically broken, the flaws are left in the upper cover after the breaking, the appearance of the upper cover is not affected, and the production efficiency and the quality of the upper cover can be improved.

Drawings

Fig. 1 is a schematic sectional structure of the present invention;

fig. 2 is a schematic cross-sectional structure view in the mold closing state of the present invention;

fig. 3 is an enlarged schematic view of fig. 2 at a according to the present invention;

FIG. 4 is a schematic cross-sectional view of the second nozzle plate during opening of the second nozzle plate according to the operation of the present invention;

FIG. 5 is a schematic cross-sectional view of the first nozzle plate during opening of the present invention;

FIG. 6 is a schematic cross-sectional view of the panel opening in the operation of the present invention;

FIG. 7 is a schematic cross-sectional view of the push plate opening in the operation process of the present invention;

FIG. 8 is a schematic cross-sectional view of the upper mold mounting plate opened in the operation of the present invention;

fig. 9 is a schematic cross-sectional view of the driving mechanism during driving in the operation process of the present invention.

The reference numerals and names in the figures are as follows:

10-upper die assembly, 20-lower die assembly, 30-glue inlet assembly, 40-push rod assembly, 50-die core, 11-panel, 12-first water port plate, 13-second water port plate, 14-upper die mounting plate, 15-first die core cavity, 16-glue inlet cavity, 17-blowing pipe, 21-bottom plate, 22-supporting square iron, 23-lower die mounting plate, 24-push plate, 25-second die core cavity, 26-sliding limiting rod, 27-telescopic through hole, 28-third die core cavity, 31-pouring gate profiling block, 32-pouring gate profiling block, 33-waste residue discharging block, 34-water cut-off block, 35-glue inlet channel, 41-driving mechanism, 42-ejector pin fixing plate, 43-ejector pin, 44-push block, 51-upper die core, 52-lower die core, 53-cavity, 54-cavity, 55-USB profile block, and 56-nozzle profile groove.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1 to 9, in an embodiment of the present invention, a mold for a draft-free injection molding product with a USB port includes an upper mold component 10, a lower mold component 20, a glue inlet component 30, a push rod component 40 and a mold core 50, wherein the upper mold component 10 and the lower mold component 20 are matched with each other; the glue feeding assembly 30 is arranged on the upper die assembly 10, the push rod assembly 40 is arranged on the lower die assembly 20, the die core 50 is arranged between the upper die assembly 10 and the lower die assembly 20, the glue feeding assembly 30 and the push rod assembly 40 are respectively butted with the die core 50, the die core 50 comprises an upper die core 51 and a lower die core 52, the upper die core 51 is provided with a die cavity 53 which penetrates through the upper end and the lower end, the upper end of the lower die core 52 is provided with a die cavity body 54 which is sleeved on the die cavity 53, the upper end of the die cavity body 54 is provided with a USB profiling block 55, and a water gap profiling groove 56 is arranged on the die cavity body 54 and is positioned beside the USB profiling block 55; the glue inlet assembly 30 is provided with a glue inlet channel 35 butted with the water gap profiling groove 56, and the lower end surface of the glue inlet assembly 30 is in sealing fit with the upper end of the upper die core 51; the upper die assembly 10 is provided with a first die cavity 15 for installing an upper die core 51 and a glue inlet cavity 16 positioned at the upper end of the first die cavity 15, the glue inlet assembly 30 is arranged on the glue inlet cavity 16, and the glue inlet assembly 30 is in butt joint with the upper die core 51; the upper die assembly 10 is further provided with a blow pipe 17, and the blow pipe 17 is communicated with the glue inlet cavity 16.

In the above embodiment, the upper die assembly 10, the lower die assembly 20, the glue inlet assembly 30, the push rod assembly 40 and the die core 50 are adopted, the glue inlet chamber 16 is arranged on the upper die assembly 10, and the through air blowing pipe 17 is arranged at the side part of the glue inlet chamber 16; the mold core 50 is provided with an upper mold core 51 with a mold cavity 53 and a lower mold core 52 with a mold cavity 54, the upper end of the mold cavity 54 is provided with a USB profile block 55, a water gap profile groove 56 is arranged at the side position of the USB profile block 55 on the mold cavity 54, after injection molding, a bulge (a structure after injection molding of the water gap profile groove 56) connected with a water gap is formed inwards at the USB port position of the upper cover, when mold opening is carried out, the glue inlet assembly 30 firstly ascends, the water gap position is broken, and flaws are left at the position of the bulge, so that the appearance of the upper cover is not influenced; after the water gap is broken, blowing gas into the gas blowing pipe 17 to ensure that no sticking is generated between the formed upper cover and the upper mold core; through the structure, the demolding operation without draft can be completed, the water gap position can be automatically broken, the flaws are left in the upper cover after the breaking, the appearance of the upper cover is not affected, and the production efficiency and the quality of the upper cover can be improved.

As further shown in fig. 2, both the upper mold component 10 and the lower mold component 20 are provided with sliding limiting holes, sliding limiting rods 26 are arranged in the sliding limiting holes, and the upper mold component 10 and the lower mold component 20 are mutually matched through the sliding limiting rods 26; in the present embodiment, the upper die assembly 10 and the lower die assembly 20 can be precisely butted by providing the slide limiting hole to cooperate with the slide limiting rod 26 to limit the position of the upper die assembly 10 and the lower die assembly 20.

Further as shown in fig. 1-2, the upper mold assembly 10 includes a face plate 11, a first water gap plate 12, a second water gap plate 13 and an upper mold mounting plate 14, the glue inlet assembly 30 includes a sprue dummy block 31, a sprue channel dummy block 32, a waste residue discharging block 33 and a sprue channel cutoff block 34, the face plate 11, the first water gap plate 12, the second water gap plate 13 and the upper mold mounting plate 14 are combined up and down by sliding the stopper rod 26, and the glue inlet channel 35 is penetratingly disposed on the sprue channel dummy block 31, the sprue channel dummy block 32, the waste residue discharging block 33 and the sprue channel cutoff block 34; the first die core cavity 15 is arranged at the lower end of the upper die mounting plate 14, the glue inlet cavity 16 is arranged at the upper end of the upper die mounting plate 14, and the glue inlet cavity 16 upwards penetrates through the second water gap plate 13, the first water gap plate 12 and the panel 11; the sprue profiling block 31 and the sprue profiling block 32 are both arranged in the glue inlet cavity 16 on the panel 11, the lower end of the sprue profiling block 31 is in butt fit with the upper end of the sprue profiling block 32, and the lower part of the sprue profiling block 32 is in sliding fit with the glue inlet cavity 16 on the first water gap plate 12; the waste residue discharging block 33 is arranged in the glue inlet cavity 16 on the first water gap plate 12, the upper end of the waste residue discharging block 33 is in butt joint fit with the lower end of the sprue channel profiling block 32, the lower part of the waste residue discharging block 33 is in sliding fit with the glue inlet cavity 16 on the second water gap plate 13, the water gap cutting block 34 is arranged in the glue inlet cavity 16 on the second water gap plate 13, the upper end of the water gap cutting block 34 is in butt joint fit with the lower end of the waste residue discharging block 33, the lower part of the water gap cutting block 34 is in sliding fit with the glue inlet cavity 16 on the upper die mounting plate 14, and the lower end of the water gap cutting block 34 is in butt joint with the upper end of the upper die core 51; in this embodiment, the gate cutting block 34 is disposed in the glue inlet chamber 16 of the second gate plate 13, after the mold is opened, the second gate plate 13 is opened, and the second gate plate 13 drives the gate cutting block 34 upward, so that the gate position of the molded product can be snapped; the waste residue unloading block 33 is arranged in the glue inlet cavity 16 on the first water gap plate 12, the sprue imitation block 31 and the sprue imitation block 32 are both arranged in the glue inlet cavity 16 on the panel 11, after the water gap position is broken, the panel 11 is opened, the panel 11 drives the sprue imitation block 32 to move upwards, waste residue is remained in the waste residue unloading block 33, in order to ensure that the waste residue is remained in the waste residue unloading block 33, an expansion part can be arranged at the position of the lower end glue inlet channel 35 of the waste residue unloading block 33, so that the formed waste residue is limited to the expansion part and cannot be driven by the ascending of the sprue imitation block 32, the waste residue remained in the waste residue unloading block 33 slides downwards along the sprue channel of the waste residue unloading block 33 to slide out of the waste residue unloading block 33 due to small resistance, and therefore, the design can control the automatic separation of the waste residue after the die sinking, and quicken the production rate of products.

As further shown in fig. 1-2, the lower die assembly 20 includes a bottom plate 21, a supporting square iron 22 and a lower die mounting plate 23, the supporting square iron 22 is fixedly mounted on the bottom plate 21, a sliding limiting rod 26 is disposed on the supporting square iron 22, and the lower die mounting plate 23 is limited on the supporting square iron 22 by the sliding limiting rod 26; the lower die mounting plate 23 is provided with a second die cavity 25 for mounting a lower die core 52 and a telescopic through hole 27 connected with the push rod assembly 40; the push rod assembly 40 comprises an ejector pin fixing plate 42, an ejector rod 43, a push block 44 and a driving mechanism 41, the driving mechanism 41 is fixedly arranged on the lower die mounting plate 23, the ejector pin fixing plate 42 is in power connection with the driving mechanism 41, the ejector rod 43 is arranged on the ejector pin fixing plate 42, the ejector rod 43 is in sliding connection with the telescopic through hole 27, and the push block 44 is arranged at the upper end of the ejector rod 43 and corresponds to the lower end of the die cavity body 54; in this embodiment, after the mold opening, the driving mechanism 41 drives the pushing block 44 to move upward, so as to push the formed upper cover out of the cavity 54 of the lower mold core 52, thereby completing the unloading operation of the upper cover.

As further shown in fig. 1-2, the lower mold assembly 20 further includes a push plate 24, the push plate 24 is limited between the lower mold mounting plate 23 and the upper mold mounting plate 14 by a sliding limiting rod 26, the push plate 24 is provided with a third mold cavity 28 in sliding fit with the lower mold 52, and the upper end of the third mold cavity 28 corresponds to the lower end of the mold cavity 54. In the above embodiment, by providing the push plate 24, in the mold opening process, the upper mold core 51 is first opened by pushing the push plate 24, and at the same time, the push plate 24 will drive the push block 44 to rise together, so as to drive the upper cover to rise along the upper mold core 51 for a certain distance, so that the upper cover can be cooled and retracted first, and then the upper mold mounting plate 14 is directly opened, so that the upper mold mounting plate 14 drives the upper mold core 51 to rise, at this time, a part of the formed upper cover is already released from the mold cavity 54, and at this time, the formed upper cover is pushed out by the push block 44 to be released from the mold cavity 54, so that the upper cover can be stably released from the mold.

The operation process comprises the following steps:

for the purpose of further describing the structural design of the present application, the present application will be described in more detail with reference to the following operation flow when the mold is opened:

1) as shown in fig. 4, the second nozzle plate 13 is opened, and the second nozzle plate 13 drives the nozzle block 34 upward, so that the nozzle at the nozzle profiling groove 56 is broken;

2) as shown in fig. 5, the first nozzle plate 12 is opened, the waste slag discharging block 33 is lifted, and waste slag is extracted from the rubber inlet channel 35 of the nozzle block 34;

3) driving a blowing device, wherein the blowing device blows air along a blowing pipe 17, so that the air enters a glue inlet chamber 16 along the blowing pipe 17, and the upper end of the injection molding workpiece is rapidly cooled;

4) as shown in fig. 6, the panel 11 is opened, the sprue profiling block 32 rises to be separated from the waste slag in the sprue, and the waste slag falls off downwards along the glue inlet channel 35 of the waste slag discharging block 33, so that the automatic discharging operation of the waste slag is completed;

5) as shown in fig. 7, the push plate 24 is opened, the push plate 24 drives the upper mold mounting plate 14 to move upward, the upper mold mounting plate 14 is pushed upward, and meanwhile, the lower end of the injection molding workpiece is pushed by the third mold cavity 28, so that the injection molding workpiece is pushed upward to complete the inward-retracting operation;

6) as shown in fig. 8, the upper die mounting plate 14 is opened, and the upper die mounting plate 14 is detached from the injection-molded workpiece;

7) as shown in fig. 9, the driving mechanism 41 drives the needle fixing plate 42 upward, thereby driving the push rod 43 upward, raising the push block 44, and ejecting the injection-molded workpiece.

This application is through adopting above-mentioned mould of taking USB mouth not having draft injection moulding product, carries out the die sinking operation according to certain order, can make the fashioned upper cover also can realize stable drawing of patterns operation under the supplementary draft's of no draft the condition to can also have the in-process of die sinking to realize the stretch-breaking of mouth of a river and droing of waste residue, be favorable to carrying out batch flow production, great improvement the production efficiency of this product.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims (5)

1. A mold for a draft-free injection molding product with a USB port comprises an upper mold component, a lower mold component, a glue inlet component, a push rod component and a mold core, wherein the upper mold component and the lower mold component are matched with each other; the upper die assembly is provided with a cavity body which is sleeved with the cavity body, the lower die assembly is provided with a USB profiling block, and a water gap profiling groove is arranged at the side position of the USB profiling block on the cavity body; the glue inlet assembly is provided with a glue inlet channel butted with the water gap profiling groove, and the lower end surface of the glue inlet assembly is in sealing fit with the upper end of the upper die core; the upper die assembly is provided with a first die cavity for mounting an upper die core and a glue inlet cavity positioned at the upper end of the first die cavity, the glue inlet assembly is arranged on the glue inlet cavity, and the glue inlet assembly is in butt joint with the upper die core; the upper die assembly is also provided with an air blowing pipe which is communicated with the glue inlet cavity.

2. The mold for the draft-free injection molding product with the USB port according to claim 1, wherein the upper mold component and the lower mold component are both provided with a sliding limiting hole, a sliding limiting rod is arranged in the sliding limiting hole, and the upper mold component and the lower mold component are mutually matched through the sliding limiting rod.

3. The mold for the injection molding product with the USB port and no draft angle according to claim 2, wherein the upper mold component comprises a panel, a first water port plate, a second water port plate and an upper mold mounting plate, the glue feeding component comprises a sprue dummy block, a sprue channel dummy block, a waste residue discharging block and a water port cutoff block, the panel, the first water port plate, the second water port plate and the upper mold mounting plate are combined from top to bottom by sliding a limiting rod, and the glue feeding channel is arranged on the sprue dummy block, the sprue channel dummy block, the waste residue discharging block and the water port cutoff block in a penetrating way; the first die core cavity is arranged at the lower end of the upper die mounting plate, the glue inlet cavity is arranged at the upper end of the upper die mounting plate, and the glue inlet cavity is upwards communicated with the second water gap plate, the first water gap plate and the panel; the sprue profiling block and the sprue channel profiling block are both arranged in the glue inlet cavity on the panel, the lower end of the sprue profiling block is in butt joint fit with the upper end of the sprue profiling block, and the lower part of the sprue profiling block is in sliding fit with the glue inlet cavity on the first nozzle plate; the waste residue unloading block is arranged in a glue inlet cavity on the first nozzle plate, the upper end of the waste residue unloading block is in butt joint with the lower end of the sprue imitation block, the lower part of the waste residue unloading block is in sliding fit with the glue inlet cavity on the second nozzle plate, the water gap cutting block is arranged in the glue inlet cavity on the second nozzle plate, the upper end of the water gap cutting block is in butt joint with the lower end of the waste residue unloading block, the lower part of the water gap cutting block is in sliding fit with the glue inlet cavity on the upper die mounting plate, and the lower end of the water gap cutting block is in butt joint with the upper end of the upper die core.

4. The mold for the draft-free injection molding product with the USB port according to claim 3, wherein the lower mold component comprises a bottom plate, a supporting square iron and a lower mold mounting plate, the supporting square iron is fixedly mounted on the bottom plate, a sliding limiting rod is arranged on the supporting square iron, and the lower mold mounting plate is limited on the supporting square iron through the sliding limiting rod; a second die cavity for mounting a lower die core and a telescopic through hole for connecting the push rod assembly are arranged on the lower die mounting plate; the push rod assembly comprises a thimble fixing plate, a push rod, a push block and a driving mechanism, the driving mechanism is fixedly installed on the lower die installation plate, the thimble fixing plate is in power connection with the driving mechanism, the push rod is installed on the thimble fixing plate and is in sliding connection with the telescopic through hole, and the push block is arranged at the upper end of the push rod and corresponds to the lower end of the cavity.

5. The mold for the draft-less injection molding product with the USB port as claimed in claim 4, wherein the lower mold assembly further comprises a push plate, the push plate is limited between the lower mold mounting plate and the upper mold mounting plate by a sliding limiting rod, the push plate is provided with a third mold cavity chamber in sliding fit with the lower mold cavity, and the upper end of the third mold cavity chamber corresponds to the lower end of the mold cavity body.

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