CN111186054A - Polyurethane foam filling ring foaming mold - Google Patents

Abstract

The invention provides a polyurethane foam filling ring foaming mold, which comprises: the female die comprises a left female die and a right female die, the left female die and the right female die are spliced to form a cavity inside, and the left female die and the right female die are detachably connected; the male die comprises an upper male die and a lower male die, the upper male die and the lower male die are spliced and then matched with the cavity of the female die to enclose a die cavity, and the die cavity is suitable for forming a polyurethane foam filling ring; and the material injection structure is arranged on the female die and is suitable for injecting polyurethane foam material into the die cavity. This polyurethane foam fills ring foaming mould, the negative and positive mould all can be demolishd smoothly, and can avoid direct action in the product during the drawing of patterns, avoids operation such as sled, knocking to cause the damage to the product, and the sprue can be blocked fast after the foam inspires a certain degree, and the product appearance is smooth, does not have unnecessary structure.

Description

Polyurethane foam filling ring foaming mold

Technical Field

The invention belongs to the technical field of molds for polyurethane products, and particularly relates to a polyurethane foam filling ring foaming mold.

Background

The rigid polyurethane foam plastic has excellent heat insulation performance, and as a novel heat insulation material, the application of the rigid polyurethane foam plastic in building external wall heat insulation systems, cold storages and refrigerator car heat insulation systems promotes the development of energy-saving engineering technology. The polyurethane foam-filled ring is an annular sealing material, and is generally an annular structure having a small inner diameter at the middle portion and large inner diameters at both ends.

Currently, polyurethane foaming generally adopts casting foaming and spraying foaming. The polyurethane foaming process has higher requirements on the structural design of a forming mold, but the existing mold still has the following problems in design: because the polyurethane has larger die-bonding force after foaming, the structural design of the die (namely die parting) is crucial to whether the product can be smoothly and completely demoulded, Chinese patent document CN201800184U discloses a die suitable for radiation crosslinking polypropylene production, which comprises a female die, a male die and a cover plate, a foaming material is molded through a die cavity formed by the female die and the male die, however, the female die and the male die of the die are both integral dies, no force application point is provided when the female die and the male die are removed from the product, the demoulding is difficult, the existing die structure is also designed in such a way that the female die is an integral die and the male die is divided into two halves from top to bottom, in the design, because the male die is divided into two halves from top to bottom, the product can be left on the upper male die and also can be left on the lower male die when the male die is demoulded, therefore, the demoulding design needs to be considered on the upper male die and the lower male die, so that the structural difficulty of the die and the risk of damage to a product during demoulding are increased; the injection port of the existing foaming mold is designed to be matched with an internal thread and an external thread, on one hand, the thread is easy to block by foam generated by polyurethane foaming during pouring foaming, so that the difficulty is caused for secondary use and cleaning of the mold, on the other hand, the thread connection operation consumes a long time, when in pouring foaming, if the blockage is performed in advance, gas is discharged during unfavorable foaming, and if the blockage is performed after the foam material is expanded to a certain degree, the polyurethane foam can overflow and solidify at the pouring port, so that a product tag is generated, and a large amount of post-treatment work is caused; the filling ring requires the net size of the mold, the requirements on the appearance and the size precision are high, when the existing mold is designed, only the parting of a female mold and a male mold is considered, other demolding mechanisms are not needed, and the product is directly knocked and pried away from the surface of the product after being formed to force the product to be separated from the mold.

Disclosure of Invention

The invention solves the technical problem of providing a polyurethane foam filling ring foaming mold, wherein a female mold and a male mold can be smoothly disassembled, the direct action on a product can be avoided during demolding, the damage to the product caused by operations such as prying, knocking and the like can be avoided, a filling port can be quickly plugged after the foaming material is inspired to a certain degree, the product has a smooth appearance, and no redundant structure exists.

In order to solve the above problems, the present invention provides a polyurethane foam filled ring foaming mold comprising:

the female die comprises a left female die and a right female die, the left female die and the right female die are spliced to form a cavity inside, and the left female die and the right female die are detachably connected;

the male die comprises an upper male die and a lower male die, the upper male die and the lower male die are spliced and then matched with the cavity of the female die to enclose a die cavity, and the die cavity is suitable for forming a polyurethane foam filling ring;

and the material injection structure is arranged on the female die and is suitable for injecting polyurethane foam material into the die cavity.

Preferably, the left female die and the right female die are connected through a bolt.

Preferably, the upper male die and the lower male die are connected by bolts.

Preferably, the female mould is removably connected to the male mould by a flange.

Preferably, the mold cavity comprises:

the equal inner diameter part is positioned in the middle of the die cavity, and the inner diameter is unchanged;

the first variable inner diameter part is positioned above the equal inner diameter part, and the inner diameter of the first variable inner diameter part is increased upwards from the equal inner diameter part;

the second variable inner diameter part is positioned below the equal inner diameter part, and the inner diameter of the second variable inner diameter part is increased downwards from the equal inner diameter part;

the molded surface of the upper male die extends to the lower end of the equal inner diameter part from the first variable inner diameter part;

or the molded surface of the lower male die extends from the second variable inner diameter part to the upper end of the equal inner diameter part.

It should be noted that the inner diameter refers to the inner diameter of the annular cavity.

Preferably, the molded surface of the upper male die extends from the first variable inner diameter part to the lower end of the equal inner diameter part; the top of the molded surface of the upper male mold is sleeved with a demolding ring, and the molded surface of the demolding ring is spliced with the molded surface of the upper male mold.

The molded surface of the mold release ring is spliced with the molded surface of the upper male mold, which means that the molded surface of the mold release ring is completely matched with the molded surface of the upper male mold, and the spliced molded surface of the product can be formed.

Preferably, the top of the upper male die is provided with a first reverse top hole, and the first reverse top hole penetrates through to the top of the demoulding ring.

Preferably, the bottom of the lower male die is provided with a second reverse top hole 8, and the second reverse top hole 8 penetrates through the bottom of the upper male die.

Preferably, the top of the molded surface of the upper male die is provided with a groove, a magnet is arranged in the groove, and the demoulding ring is made of a magnetic material.

Preferably, the top of the upper male die is also provided with a first handle.

Preferably, a second handle is further arranged on the left female die and/or the right female die.

Preferably, the injection structure comprises:

the feeding nozzle is arranged on the female die and communicated with the die cavity;

the sealing plug is matched with the feeding nozzle to seal the inlet of the feeding nozzle;

the locking mechanism is arranged between the feeding nozzle and the plugging plug and is suitable for locking or moving the relative position of the plugging plug and the feeding nozzle.

Preferably, the locking mechanism comprises:

the positioning pin is arranged on the outer side of the feeding nozzle and is perpendicular to the feeding nozzle;

the lock cover is fixedly arranged at the outer end of the seal plug; the lock cover is provided with a strip-shaped first through groove, and when the lock cover rotates relative to the feeding nozzle, the first through groove can allow the positioning pin to pass through; one end of the first through groove is communicated with one end of the second through groove, and the other end of the second through groove is communicated to one end, close to the feeding nozzle, of the locking cover.

Preferably, the positioning pin, the first through groove and the second through groove are both arranged symmetrically about the center of the sealing plug.

Preferably, when the positioning pin penetrates into the first through groove, the molded surface of the inner end of the sealing plug is spliced with the molded surface of the cavity of the female die.

It should be noted that the outer end of the plugging plug, the inner end of the plugging plug and the outer end of the inner end of the plugging plug refer to the inner side and the outer side of the die cavity, where the outer end is the end of the plugging plug far away from the die cavity, and the inner end is the end of the plugging plug close to the die cavity.

Preferably, the outer end of the plugging plug is also provided with a rotating rod, and the rotating rod is perpendicular to the plugging plug.

Preferably, the bottom of the upper male die is provided with a flange, and the top of the lower male die is provided with a concave edge matched with the flange;

or, the bottom of the upper male die is provided with a concave edge, and the top of the lower male die is provided with a flange matched with the concave edge.

Compared with the prior art, the invention has the following beneficial effects:

1. the foaming mold for the polyurethane foam filling ring is characterized in that a female mold is designed into a left female mold and a right female mold, a male mold is designed into an upper male mold and a lower male mold, the male mold and the female mold are designed in a split mode, the left female mold and the right female mold can be reversely ejected through an ejecting hole during demolding, the lower male mold and the upper male mold complete removal of the mold, the problems that a direct force application point is not needed during demolding of the integral male mold and the integral female mold and demolding is not easy are solved, the unequal split of the upper male mold and the lower male mold in the male mold is avoided, the contact area of a product and the upper male mold is large, the product is forcibly left on the upper male mold during reversely ejecting the male mold and the lower male mold, only a demolding structure needs to be designed on the upper male mold, the difficulty of the mold structure is;

2. according to the polyurethane foam filling ring foaming mold, the material injection structure is matched with the feeding nozzle, the sealing plug, the locking cover and the positioning pin, when the feeding nozzle needs to be sealed, the sealing plug only needs to be pressed down forcibly, the locking cover is rotated, the positioning pin is rotated into the through groove on the locking cover, the sealing can be completed quickly, the operation is simple, convenient, quick and time-saving, quick sealing can be performed after the foam material is started to a certain degree, the foam cannot overflow and solidify into a redundant boss, gas in the foaming process can be discharged in time, the sealing plug can be tightly pushed due to volume expansion generated by foam material foaming, the molded surface of the sealing plug and the molded surface of a mold cavity are designed according to the shape, and the phenomenon that the excessive boss is generated at the material injection port and a large amount of post-repair work is caused can;

3. according to the polyurethane foam filling ring foaming mold, the demolding ring is arranged at the top of the upper male mold surface, when the upper male mold is removed, force can be applied to the demolding ring through the reverse top, so that the upper male mold is removed, the demolding ring can be separated by lightly snapping with hands, the problem of difficult demolding is solved, the damage to a product during demolding is avoided, the demolding ring is fixed with the upper male mold through the magnet, and the mold is assembled simply, conveniently and quickly.

Drawings

FIG. 1 is a cross-sectional view of a polyurethane foam filled ring foaming mold according to an embodiment of the present invention;

FIG. 2 is a perspective view of a polyurethane foam filled ring foaming mold according to an embodiment of the present invention;

FIG. 3 is a sectional view of an injection structure in a polyurethane foam filled ring foaming mold according to an embodiment of the present invention;

fig. 4 is a perspective view of a structure of a shot in a polyurethane foam filled ring foaming mold according to an embodiment of the present invention.

Wherein: 1-female die; 11-left female die; 12-right female die; 2-a male die; 21-upper male die; 22-a lower male die; 3-material injection structure; 31-a feed nozzle; 32-blocking; 33-a locking mechanism; 34-a pressure ring; 35-rotating the rod; 331-positioning pins; 332-a locking cover; 333-a first through groove; 334-a second through slot; 4-a mold cavity; 41-equal inner diameter part; 42-a first variable inner diameter portion; 43-a second variable inner diameter portion; 5-a flange; 6-a demoulding ring; 7-a groove; 8-second reverse top hole.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1 and fig. 2, the polyurethane foam filled ring foaming mold according to the present embodiment includes: the injection molding die comprises a female die 1, a male die 2 and an injection structure 3, wherein the female die 1 comprises a left female die 11 and a right female die 12, a cavity is formed in the left female die 11 and the right female die 12 after the left female die 11 and the right female die 12 are spliced, and the left female die 11 and the right female die 12 are detachably connected; the male die 2 comprises an upper male die 21 and a lower male die 22, the upper male die 21 and the lower male die 22 are spliced and then matched with the cavity of the female die 1 to enclose a die cavity 4, and the die cavity 4 is suitable for forming a polyurethane foam filling ring; an injection structure 3 is provided on the female mold 1, suitable for injecting polyurethane foam into the mold cavity 4.

When the polyurethane foam filling ring foaming mold is used, a left female mold 11 and a right female mold 12 are assembled, spliced and fixed to form a female mold, a cavity is formed in the female mold, an upper male mold 21 and a lower male mold 22 are assembled, spliced and fixed to form a male mold, the male mold is assembled into the cavity and assembled and matched with the female mold to form a mold cavity, foaming equipment is injected through a material injection structure 3, after the injection is completed and the molding is carried out, the left female mold and the right female mold are disassembled during demolding, then the upper male mold and the lower male mold are respectively removed, demolding of a product is completed, the male mold and the female mold are designed in a split mode, during demolding, the left female mold can be used for ejecting the right female mold, the lower male mold can be used for ejecting the upper male mold, the removal of the mold is completed, and the problem that no direct force application point exists during demolding of the integral male mold and the integral female mold is avoided.

In a preferred embodiment, the female die 1 is detachably connected with the male die 2 through a flange 5;

further preferably, the bottom of the lower male die 22 is connected with a flange, the bottom of the female die 1 is connected with a flange, the two flanges are provided with connecting holes, and the lower male die is connected with the female die through bolts penetrating through the connecting holes. Further preferably, the connecting holes are multiple and evenly distributed on the flange.

Further preferably, the top of the upper male die 21 is provided with a connecting hole, the corresponding part of the top of the female die is provided with a connecting hole, and the upper male die and the female die are connected through a bolt penetrating through the connecting hole. Further preferably, the connecting holes are multiple and are uniformly distributed on the circumferential direction of the top side wall of the upper male die.

The detachable connection of the female die and the male die can lock the relative positions of the female die and the male die, so that the casting molding is more stable, and the product quality is ensured.

Specifically, the left female die 11 and the right female die 12 may be connected by a bolt; the upper male die 21 and the lower male die 22 may be connected by bolts.

As a preferred embodiment, the mold cavity 4 comprises: the constant inner diameter portion 41 is located in the middle of the cavity 4, the inner diameter of the constant inner diameter portion is unchanged, the first variable inner diameter portion 42 is located above the constant inner diameter portion 41, the inner diameter of the constant inner diameter portion is increased upwards from the constant inner diameter portion, and the second variable inner diameter portion 43 is located below the constant inner diameter portion 41, and the inner diameter of the constant inner diameter portion is increased downwards from the constant inner diameter portion. The molded surface of the upper male die 21 extends from the first variable inner diameter part 42 to the lower end of the equal inner diameter part 41; alternatively, the profile of the lower male die 22 extends from the second variable inner diameter portion 43 to the upper end of the equal inner diameter portion 41. For the condition that the molded surface of the upper male die extends from the first variable inner diameter part to the lower end of the equal inner diameter part, the first variable inner diameter part and the whole equal inner diameter part of the product are molded by the upper male die through unequal splitting of the male die, the second variable inner diameter part is molded by the lower male die, after the product is molded, the product is not easy to remove from the upper male die due to the fact that the cylinder body of the whole equal inner diameter part is in contact with the molded surface of the upper male die, the lower male die is only in contact with the variable inner diameter part with the increased inner diameter and is easy to remove, and the product is forced to remain on the upper male die during demolding, so that the demolding structure can be designed on the upper male die only, the demolding structure design of the lower male die is not needed to be considered, the design difficulty of the die and the damage to the product and the die.

As a preferred embodiment, the profile of the upper male die 21 extends from the first variable inner diameter portion 42 to the lower end of the equal inner diameter portion 41; the top of the molded surface of the upper male mold 21 is sleeved with a demolding ring 6, and the molded surface of the demolding ring 6 is spliced with the molded surface of the upper male mold 21. When the male die is removed from the product, the lower male die can be removed through the reverse ejection action of the upper male die and the lower male die, and then the upper male die is removed through the reverse ejection action of the upper male die and the stripping ring. The demoulding ring is arranged, force can be directly applied to the demoulding ring when the upper male die is removed, and after the upper male die is removed, a product is only connected with the demoulding ring with a tiny contact surface and can be separated by lightly breaking, so that the problem that the product is difficult to remove the upper male die is solved, and the damage of the product caused by removing the upper male die is avoided.

In a preferred embodiment, the top of the upper male die 21 is provided with a first inverted top hole, which penetrates to the top of the stripper ring 6. When the upper male die is removed, the upper male die can be fixed, and a tool is used for ejecting the demoulding ring 6 through the inverted ejection hole of the upper male die, so that the product is separated from the upper male die, and the force is directly applied to the demoulding ring during demoulding, thereby avoiding the damage to the product.

In a preferred embodiment, the bottom of the lower male die 22 is provided with a second inverted top hole, and the second inverted top hole penetrates through the bottom of the upper male die. When the lower male die is removed, the lower male die can be fixed, a tool is used for reversely ejecting the bottom of the male die through a second reverse ejection hole of the lower male die, so that a product is separated from the lower male die, the lower male die is removed through the reverse ejection effect, the problem of difficult demoulding is solved, and the product is prevented from being damaged by applying force to the product.

In a preferred embodiment, the left female die 11 and/or the right female die 12 is provided with a third reverse top hole. When the left female die and the right female die are removed, the left female die or the right female die can be reversely ejected through the third reverse ejection hole, so that the left female die and the right female die are separated from a product.

In a preferred embodiment, the top of the molding surface of the upper male mold 21 can be further provided with a groove 7, a magnet is arranged in the groove 7, and the stripper ring 6 is made of a magnetic material. When the die is assembled, the demoulding ring 6 is fixed on the upper male die 21 through the magnetic force of the magnet, so that the assembly is more convenient and quicker. In a specific embodiment, 45 steel is used for the stripper ring in this embodiment.

As a preferred embodiment, as shown in fig. 3 and 4, the material injection structure 3 comprises a feeding nozzle 31, a blocking plug 32 and a locking mechanism 33, wherein the feeding nozzle 31 is arranged on the female die 1 and is communicated with the die cavity 4, the blocking plug 32 and the feeding nozzle 31 are matched to block the inlet of the feeding nozzle 31, and the locking mechanism 33 is arranged between the feeding nozzle 31 and the blocking plug 32 and is suitable for locking or moving the relative position of the blocking plug 32 and the feeding nozzle 31. And when the material is injected, the locking mechanism 33 is opened, the plugging plug 32 is taken out, the foam material is injected from the feeding nozzle 31, after the material is injected and the material is foamed to a certain degree, the plugging plug is plugged in, and the position of the plugging plug is locked through the locking mechanism.

As a preferred embodiment, the locking mechanism 33 includes a positioning pin 331 and a locking cover 332, the positioning pin 331 is disposed outside the feeding nozzle 31 and is perpendicular to the feeding nozzle 31, and the locking cover 332 is fixedly disposed at the outer end of the sealing plug 32; the lock cover 332 is provided with a strip-shaped first through groove 333, and when the lock cover 332 rotates relative to the feeding nozzle 31, the first through groove 333 can allow the positioning pin 331 to pass through; one end of the first through groove 333 is communicated with one end of the second through groove 334, and the other end of the second through groove 334 is communicated to one end of the locking cover 332 close to the feeding nozzle 31. When the feeding nozzle is plugged, the second through groove on the lock cover is aligned to the positioning pin, the plugging plug is pressed into the feeding nozzle, then the lock cover is rotated to enable the positioning pin to be screwed into the first through groove, and the position of the plugging plug is locked.

In a preferred embodiment, the two positioning pins 331, the two first through grooves 333, and the two second through grooves 334 are symmetrically disposed about the center of the plug 32, so that the locking mechanism can lock the plug more stably and firmly.

In a preferred embodiment, when the positioning pin 331 is inserted into the first through groove 333, the inner end of the closing plug 32 has a profile matching the profile of the cavity of the female mold 1. Namely, the molded surface of the inner end of the sealing plug and the cavity of the female die are designed along with the mold, and are completely matched with the cambered surface of the cavity after being spliced, so that the excessive boss at the material injection port can be avoided.

Preferably, the feeding device further comprises a pressing ring 34, the pressing ring 34 is sleeved outside the feeding nozzle 31, the locking cover 332 is tightly matched with the pressing ring 34, and the pressing ring 34 can further protect the structure of the feeding nozzle.

Preferably, the plug 32 is further provided with a rotating rod 35 at the outer end thereof, and the rotating rod 35 is arranged perpendicular to the plug 32, so that the plug can be rotated more conveniently.

Preferably, the bottom of the upper male die 21 is provided with a flange, and the top of the lower male die 22 is provided with a concave edge matched with the flange; or, the bottom of the upper male die 21 is provided with a concave edge, and the top of the lower male die 22 is provided with a flange matched with the concave edge. The flange is matched with the concave edge, so that the splicing assembly of the upper male die and the lower male die is easier, and the positioning is more accurate.

Preferably, the top of the upper male die 21 is further provided with a first handle, and the left female die 11 and/or the right female die 12 are further provided with a second handle, so that the demolding operation is facilitated.

The overall working process of the polyurethane foam filling ring foaming mold in the embodiment is as follows: assembling and splicing a left female die and a right female die, fixing the left female die and the right female die by using bolts to form a female die, forming a cavity in the female die, assembling an upper male die and a lower male die, fixing the male die by using bolts to form a male die, assembling a demolding ring at the top of the surface of the upper male die, assembling the male die into the cavity of the female die, assembling and matching the male die with the female die to form a die cavity, fixing the male die and the female die by using bolts through a flange male die, unscrewing a sealing plug, extending a gun head of foaming equipment into the die cavity through a feeding nozzle, immediately taking out the foaming equipment, plugging the foaming equipment into a filling port when foaming materials are started, aligning a positioning pin to a second through groove, rotating a rotating rod, screwing the positioning pin into the first through groove to lock the position of the sealing plug, enabling the sealing plug to be tightly pressed by volume expansion generated by foaming of the foaming materials, and after the foaming is completed and formed, firstly disassembling the, fixing the left female die, reversely ejecting the right female die through the third reverse ejection hole, removing the left female die and the right female die under the reverse ejection action, then detaching the upper male die and the lower male die, fixing the lower male die, reversely ejecting the male die through the second reverse ejection hole, separating the lower male die, fixing the upper male die, reversely ejecting the demolding ring through the first reverse ejection hole, separating the upper male die, and finally, removing the demolding ring by lightly manually disassembling to finish demolding.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.

Claims (10)

1. A polyurethane foam filled ring foaming mold, comprising:

the female die comprises a left female die and a right female die, the left female die and the right female die are spliced to form a cavity inside, and the left female die is detachably connected with the right female die;

the male die comprises an upper male die and a lower male die, the upper male die and the lower male die are spliced and then matched with the cavity of the female die to enclose a die cavity, and the die cavity is suitable for forming a polyurethane foam filling ring;

and the material injection structure is arranged on the female die and is suitable for injecting polyurethane foam material into the die cavity.

2. The polyurethane foam filled ring foaming mold of claim 1,

the mold cavity comprises: the equal inner diameter part is positioned in the middle of the die cavity, and the inner diameter of the equal inner diameter part is unchanged;

a first variable inner diameter part which is positioned above the equal inner diameter part and the inner diameter of which is increased upwards from the equal inner diameter part;

a second variable inner diameter portion which is positioned below the equal inner diameter portion and has an inner diameter which is increased downwards from the equal inner diameter portion;

the molded surface of the upper male die extends from the first variable inner diameter part to the lower end of the equal inner diameter part;

or the molded surface of the lower male die extends from the second variable inner diameter part to the upper end of the equal inner diameter part.

3. The polyurethane foam filled ring foaming mold of claim 2, wherein:

the molded surface of the upper male die extends from the first variable inner diameter part to the lower end of the equal inner diameter part; and the top of the molded surface of the upper male die is sleeved with a demoulding ring, and the molded surface of the demoulding ring is spliced with the molded surface of the upper male die.

4. The polyurethane foam filled ring foaming mold of claim 3, wherein:

and a first reverse top hole is formed in the top of the upper male die and penetrates through the top of the demoulding ring.

5. The polyurethane foam filled ring foaming mold of claim 3, wherein:

and a second reverse top hole is formed in the bottom of the lower male die and penetrates through the bottom of the upper male die.

6. The polyurethane foam filled ring foaming mold of claim 3, wherein:

the top of the molded surface of the upper male mold is provided with a groove, a magnet is arranged in the groove, and the demolding ring is made of a magnetic material.

7. The polyurethane foam filled ring foaming mold according to any of the claims 1-6, wherein the shot structure comprises:

the feeding nozzle is arranged on the female die and communicated with the die cavity;

the sealing plug is matched with the feeding nozzle to seal the inlet of the feeding nozzle;

and the locking mechanism is arranged between the feeding nozzle and the plugging plug and is suitable for locking or moving the relative position of the plugging plug and the feeding nozzle.

8. The polyurethane foam filled ring foaming mold of claim 7, wherein the locking mechanism comprises:

the positioning pin is arranged on the outer side of the feeding nozzle and is perpendicular to the feeding nozzle;

the locking cover is fixedly arranged at the outer end of the sealing plug; the lock cover is provided with a strip-shaped first through groove, and when the lock cover rotates relative to the feeding nozzle, the first through groove can allow the positioning pin to pass through; one end of the first through groove is communicated with one end of the second through groove, and the other end of the second through groove is communicated to one end, close to the feeding nozzle, of the locking cover.

9. The polyurethane foam filled ring foaming mold of claim 8, wherein:

when the positioning pin penetrates into the first through groove, the molded surface of the inner end of the sealing plug is spliced with the molded surface of the cavity of the female die.

10. The polyurethane foam filled ring foaming mold according to any of claims 1-6, wherein:

the bottom of the upper male die is provided with a flange, and the top of the lower male die is provided with a concave edge matched with the flange;

or, the bottom of the upper male die is provided with a concave edge, and the top of the lower male die is provided with a flange matched with the concave edge.

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