CN220198389U - Tubular product mould - Google Patents

Abstract

The utility model discloses a tubular product mold, which comprises a forming mold, wherein the forming mold comprises an upper mold and a lower mold which can be mutually combined or separated, a plurality of tube cavities are formed between the upper mold and the lower mold in a surrounding manner, an upper inner mold is arranged at the top part of the upper mold in the tube cavity, a lower inner mold is arranged at the bottom part in the tube cavity in the lower mold, the bottom surface of the upper inner mold is propped against the top surface of the lower inner mold, a forming cavity is formed by surrounding between the outer wall of the upper inner mold, the outer wall of the lower inner mold and the tube cavity, and a guide groove is formed at the bottom surface of the upper inner mold; the utility model sets up the exhaust line on the upper internal mold, make the gas in the shaping cavity exhaust in time under the guidance of the guide slot, solve the internal closed problem of shaping cavity, reduce the bubble and produce, improve the inner and outer wall finish of the product, guarantee the shaping effect of the product.

Description

Tubular product mould

Technical Field

The utility model relates to the field of pipeline accessory mould structures, in particular to a tubular product mould.

Background

The disposable blood circuit is suitable for establishing an extracorporeal circulation channel during hemodialysis treatment, a pipeline connecting fitting is arranged in the blood circuit, the pipeline connecting fitting is a tubular thin-wall product, the side wall of the pipeline connecting fitting is provided with a communicating branching pipe, the fitting is often made of soft PVC (polyvinyl chloride) materials, because the whole fitting is thin, the whole fitting is difficult to fill in the molding process, the appearance of the product is seriously affected by bubbles falling on the product due to untimely air exhaust, and in addition, in order to prevent the conditions of unsmooth pipeline installation and blood leakage, the smoothness of the inner wall of the fitting is required in the production process, but a molding die cavity is closed, gas is difficult to discharge, the surface smoothness of the product is easily affected, and the product is bad.

Disclosure of Invention

The present utility model aims to provide a tubular product mould which solves one or more of the technical problems of the prior art, and at least provides a beneficial choice or creation condition.

The utility model solves the technical problems as follows:

a tubular article mold comprising: the forming die comprises an upper die and a lower die which can be mutually combined or separated, a plurality of tube cavities are formed between the upper die and the lower die in a surrounding mode, an upper inner die is arranged at the top of the tube cavity in the upper die, a lower inner die is arranged in the inner bottom of the tube cavity in the lower die, the bottom surface of the upper inner die is propped against the top surface of the lower inner die, a forming cavity is formed by the outer wall of the upper inner die, the outer wall of the lower inner die and the tube cavity in a surrounding mode, and a guide groove is formed in the bottom surface of the upper inner die; and one end of the exhaust pipeline is communicated with the outer wall of the upper die, and the guide groove is respectively communicated with the other end of the exhaust pipeline and the forming cavity.

The technical scheme has at least the following beneficial effects: the outer diameter of the upper internal mold and the outer diameter of the lower internal mold are smaller than the inner diameter of the pipe cavity, when the upper mold and the lower mold are combined, the bottom surface of the upper internal mold and the top surface of the lower internal mold are mutually abutted, and the pipe cavity is closed, so that the outer wall of the upper internal mold, the outer wall of the lower internal mold and the pipe cavity enclose a forming cavity of a tubular thin-wall product, the bottom surface of the upper internal mold is provided with a guide groove communicated with the forming cavity, an exhaust pipeline extends into the guide grooves arranged on the plurality of upper internal molds, and in the forming process of the tubular product, diffused gas flows into the exhaust pipeline along with the guide groove and is discharged out of the forming mold through the exhaust pipeline.

As a further improvement of the technical scheme, the outer wall of the upper die is provided with a suction piece, and the suction piece is communicated with the exhaust pipeline. The getter provides a negative pressure environment for the exhaust pipeline, increases the exhaust of the molding cavity, reduces the pressure loss caused by bending of the exhaust pipeline, improves the molding effect of the product, and solves the problems that the tubular product is difficult to fill and the exhaust is poor due to the pipeline connecting fittings.

As another improvement of the above technical solution, the plurality of guide grooves diverge around the exhaust pipe as a center. One end of each guide groove is communicated with the exhaust pipeline, the other end of each guide groove is radially diverged and extends to the side wall of the upper inner die to be communicated with the forming cavity, so that gas around the inside of the forming cavity with the thick wall of the deep cavity can flow into the exhaust pipeline, uneven gas discharge is reduced, and the exhaust effect is improved.

As a further improvement of the technical scheme, a buffer groove is formed in the middle of the bottom surface of the upper inner die, the guide groove is communicated with the exhaust pipeline through the buffer groove, and the depth of the buffer groove is larger than that of the guide groove. One end of the guide groove is communicated with the buffer groove, the other end of the guide groove extends to the side wall of the upper inner mold, gas can enter the buffer groove through the guide groove and finally is discharged out of the forming mold through the exhaust pipeline, the buffer groove deepens the communicated part of the exhaust pipeline, the gas flowing space is enlarged, and the gas discharging effect is improved.

As a further improvement of the technical scheme, the depth of the guide groove is 0.01 mm-0.02 mm. A sealing surface is formed between the upper inner die and the lower inner die, and because the forming cavity is deeper, the PCV material for manufacturing the pipeline connecting fitting is softer, and the depth of the guide groove is set to be 0.01-0.02 mm, so that the gap between the outer walls of the upper inner die and the lower inner die is at most 0.01-0.02 mm, the phenomenon that a product is draped over a front caused by the extension of materials is prevented, and meanwhile, the exhaust of the forming cavity can be realized.

As another improvement of the technical scheme, a supporting block is arranged at the bottom of the buffer groove and is flush with the bottom surface of the upper inner die. The abutting area between the upper internal mold and the lower internal mold is increased, the deformation and damage of the mold caused by overhigh pressure intensity are reduced, the stability of the upper internal mold and the lower internal mold during mold closing is enhanced, and the service life is prolonged.

As another improvement of the technical scheme, a positioning groove and a buffer groove are formed in the bottom surface of the upper inner die, a positioning block matched with the positioning groove is arranged on the top surface of the lower inner die, the buffer groove is annular and surrounds the positioning groove, an exhaust pipeline is communicated with the buffer groove, two ends of the guide groove are respectively communicated with the buffer groove and the forming cavity, and the depth of the buffer groove is larger than that of the guide groove. When the upper die and the lower die are assembled or opened, the upper inner die and the lower inner die realize sliding phase alignment and sliding phase alignment through the positioning blocks and the positioning grooves, so that the product forming precision is ensured, meanwhile, the buffer groove is annular and avoids the positioning blocks, the exhaust pipeline is communicated in the buffer groove, gas generated in the forming cavity can flow to the buffer groove through the guide groove, and then is discharged out of the forming die from the exhaust pipeline, the annular buffer groove improves the range of gas which can be discharged, the exhaust effect is improved, the buffer groove is deeper than the guide groove, the product generation flash is reduced, and the surface finish of the product is improved.

As another improvement of the technical scheme, a branch cavity is formed between the upper die and the lower die, one end of the branch cavity is communicated with the forming cavity, and the other end of the branch cavity is communicated forwards or backwards. The forming die further comprises a side core, the side core stretches into the columnar structure along the inner part of the branch cavity, after the product is formed, the side core slides out along the extending direction of the parallel branch cavity, a part of the forming cavity can form a pipe body of the pipe connecting fitting, a branch pipe communicated with the pipe body can be formed between the branch cavity and the columnar structure, and product forming is achieved.

As a further improvement of the technical scheme, the upper die is vertically penetrated with a glue outlet runner, the glue outlet runner extends to the bottom surface of the upper die, and a glue-diving port of the glue outlet runner is opposite to the side wall of the branch cavity. The upper die and the lower die enclose the glue outlet flow channel into a closed flow channel, the glue-diving port is close to and opposite to the side wall of the branch cavity, raw materials pass through the glue outlet flow channel downwards and flow at the glue outlet flow channel between the upper die and the lower die, and the raw materials are extruded into the branch cavity and the forming cavity through the glue-diving port.

As a further improvement of the technical scheme, the upper die is provided with an arc-shaped groove and an exhaust groove which are sequentially communicated, the arc-shaped groove is arranged around the forming cavity, and the exhaust groove extends to the side wall of the upper die along the direction parallel to the branch cavity. The arc-shaped groove is arranged around the cavity, the gas exhaust range is increased, the exhaust effect is improved, the gas of the arc-shaped groove flows into the exhaust groove, meanwhile, the exhaust groove is close to and parallel to the direction of the branch cavity and extends to the side wall of the upper die, so that the gas generated by the product in the branch cavity can flow into the exhaust groove, finally, the gas is exhausted out of the upper die, the exhaust effect of the outer surface in the product forming process is improved, the arc-shaped groove is positioned between the sealing surfaces between the upper die and the lower die, the exhaust of the deep-cavity tubular thin-wall product is ensured, and the surface finish of the product is improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the drawings that are required to be used in the description of the embodiments will be briefly described below. It is evident that the drawings described are only some embodiments of the utility model, but not all embodiments, and that other designs and drawings can be obtained from these drawings by a person skilled in the art without inventive effort.

FIG. 1 is a diagram of the upper die structure of a tubular product die according to one embodiment of the present utility model;

FIG. 2 is a top cross-sectional view of a tubular article mold according to one embodiment of the present utility model;

FIG. 3 is a partial method diagram of an upper die according to an embodiment of the present utility model;

FIG. 4 is a block diagram of an upper inner mold according to an embodiment of the present utility model;

fig. 5 is a block diagram of a lower inner mold according to an embodiment of the present utility model.

In the accompanying drawings: 110-upper die, 111-tube cavity, 120-getter, 130-branch cavity, 140-glue outlet flow channel, 151-arc groove, 152-exhaust groove, 160-pipeline connecting fitting, 210-upper inner die, 220-exhaust pipeline, 310-forming cavity, 320-guide groove, 330-buffer groove, 340-supporting block, 350-glue-diving port, 410-positioning groove, 510-lower inner die and 520-positioning block.

Detailed Description

The conception, specific structure, and technical effects produced by the present utility model will be clearly and completely described below with reference to the embodiments and the drawings to fully understand the objects, features, and effects of the present utility model. It is apparent that the described embodiments are only some embodiments of the present utility model, but not all embodiments, and that other embodiments obtained by those skilled in the art without inventive effort are within the scope of the present utility model based on the embodiments of the present utility model. In addition, all connection relationships mentioned herein do not refer to direct connection of the components, but rather, refer to a connection structure that may be better formed by adding or subtracting connection aids depending on the particular implementation. The technical features of the utility model can be interactively combined on the premise of no contradiction and conflict.

In the description of the present utility model, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present utility model and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present utility model.

In the description of the present utility model, a number means one or more, a number means two or more, and greater than, less than, exceeding, etc. are understood to not include the present number, and above, below, within, etc. are understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present utility model, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present utility model can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.

Referring to fig. 1, 2 and 3, the tubular product mold comprises a forming mold and an exhaust pipeline 220, the forming mold comprises an upper mold 110 and a lower mold which can be mutually combined or separated, a plurality of tube cavities 111 are enclosed between the upper mold 110 and the lower mold, an upper inner mold 210 is arranged at the inner top of the tube cavities 111 in the upper mold 110, a lower inner mold 510 is arranged at the inner bottom of the tube cavities 111 in the lower mold, the bottom surface of the upper inner mold 210 is propped against the top surface of the lower inner mold 510, a forming cavity 310 is enclosed between the outer wall of the upper inner mold 210, the outer wall of the lower inner mold 510 and the tube cavities 111, and a guide groove 320 is arranged at the bottom surface of the upper inner mold 210; one end of the exhaust pipe 220 is connected to the outer wall of the upper mold 110, and the guide groove 320 is connected to the other end of the exhaust pipe 220 and the molding cavity 310, respectively.

Referring to fig. 2, the exhaust pipe 220 of the present embodiment extends to the bottom surfaces of the plurality of upper inner molds 210, specifically, the outer diameter of the upper inner mold 210 and the outer diameter of the lower inner mold 510 are smaller than the inner diameter of the cavity 111, when the upper mold 110 and the lower mold are combined, the bottom surfaces of the upper inner mold 210 and the top surfaces of the lower inner mold 510 are mutually abutted, and the cavity 111 is closed, so that the outer wall of the upper inner mold 210, the outer wall of the lower inner mold 510 and the cavity 111 enclose a forming cavity 310 of a tubular thin-walled product, the bottom surface of the upper inner mold 210 is provided with a guide groove 320 communicated with the forming cavity 310, the exhaust pipe 220 extends into the guide groove 320 arranged on the plurality of upper inner molds 210, and during the forming process of the tubular product by the pipe connecting fitting 160, the gas emitted along with the guide groove 320 flows into the exhaust pipe 220 and is discharged out of the forming mold through the exhaust pipe 220.

Further, an air suction member 120 is disposed on the outer wall of the upper die 110, and the air suction member 120 is communicated with the air exhaust pipeline 220.

Specifically, the getter 120 provides a negative pressure environment for the exhaust pipe 220, accelerates the exhaust of the forming cavity 310, reduces the pressure loss caused by the bending of the exhaust pipe 220, improves the product forming effect, and solves the problems of difficult filling and poor exhaust of the tubular product of the pipe connecting fitting 160. In practice, the getter 120 may be a negative pressure generator. It should be noted that, the getter 120 acts during the molding process of the molten material flowing into the molding cavity 310, so as to keep the gas generated during the molding process sucked, reduce the bubbles inside the product, and stop the getter 120 after the molding process of the product, even during the demolding process of the product.

Referring to fig. 3, in this embodiment, a buffer slot 330 is disposed in the middle of the bottom surface of the upper inner mold 210, the exhaust pipeline 220 extends to the bottom center of the upper inner mold 210, the guide slot 320 is connected to the exhaust pipeline 220 through the buffer slot 330, the depth of the buffer slot 330 is greater than that of the guide slot 320, two ends of the guide slots 320 are respectively connected to the buffer slot 330 and the forming cavity 310, and the guide slots 320 are respectively diverged outwards from the periphery of the buffer slot 330 and extend to the side wall of the upper inner mold 210.

Specifically, one end of the guide groove 320 is communicated with the buffer groove 330, the other end of the guide groove 320 extends to the side wall of the upper inner mold 210, gas can enter the buffer groove 330 through the guide groove 320, finally, the gas can be discharged out of the forming mold through the exhaust pipeline 220, the buffer groove 330 deepens the communicated part of the exhaust pipeline 220, the gas flowing space is enlarged, the gas discharging effect is improved, one ends of the guide grooves 320 are communicated with the exhaust pipeline 220, the other ends of the guide grooves are radially diverged and extend to the side wall of the upper inner mold 210, and the communication with the forming cavity 310 is realized, so that gas around the inside of the forming cavity 310 with the thick wall of the deep cavity can flow into the exhaust pipeline 220, the phenomenon of non-uniform gas discharge is reduced, and the gas discharging effect is improved.

In addition, in some embodiments, the plurality of guide grooves 320 may also be directly divergent around the exhaust pipe 220.

Specifically, one end of the plurality of guide grooves 320 is communicated with the exhaust pipeline 220, and the other end of the plurality of guide grooves radially diverges and extends to the side wall of the upper inner mold 210 to communicate with the forming cavity 310, so that gas around the inside of the forming cavity 310 with the thick wall of the deep cavity can flow into the exhaust pipeline 220, the phenomenon of uneven gas discharge is reduced, and the exhaust effect is improved.

Further, the depth of the guide groove 320 is 0.02mm.

Specifically, a sealing surface is formed between the upper inner mold 210 and the lower inner mold 510, and the molding cavity 310 is deeper, and the PCV material of the pipe connection fitting 160 is softer, and the depth of the guide groove 320 is set to be 0.02mm at the maximum, so that the gap between the outer walls of the upper inner mold 210 and the lower inner mold 510 is also 0.02mm at the maximum, preventing the material from extending into the product to cause burrs, and simultaneously realizing the exhaust of the molding cavity 310. In practice, the depth of the channel 320 may be set to a minimum of 0.01mm to ensure that gas can be exhausted into the channel 320.

Further, a supporting block 340 is disposed at the bottom of the buffer slot 330, and the supporting block 340 is flush with the bottom surface of the upper inner mold 210.

Specifically, when the upper inner mold 210 and the lower inner mold 510 are clamped, the bottom surface of the supporting block 340 is flush with the bottom surface of the upper inner mold 210, so that the supporting block 340 can be abutted against the top surface of the lower inner mold 510, the abutting area between the upper inner mold 210 and the lower inner mold 510 is increased, the deformation and damage of the mold caused by the overhigh pressure are reduced, the stability of the upper inner mold 210 and the lower inner mold 510 during clamping is enhanced, and the service life is prolonged.

Further, referring to fig. 4 and 5, a positioning groove 410 and a buffer groove 330 are provided on the bottom surface of the upper inner mold 210, a positioning block 520 matching with the positioning groove 410 is provided on the top surface of the lower inner mold 510, the annular buffer groove 330 is disposed around the positioning groove 410, the exhaust pipeline 220 is communicated with the buffer groove 330, two ends of the guide groove 320 are respectively communicated with the buffer groove 330 and the forming cavity 310, and the depth of the buffer groove 330 is greater than that of the guide groove 320.

Specifically, the position and shape of the positioning block 520 are matched with the position and shape of the positioning groove 410 up and down, when the upper die 110 and the lower die are closed or opened, the upper die 210 and the lower die 510 realize sliding combined alignment and sliding separated alignment through the positioning block 520 and the positioning groove 410, so that the product forming precision is ensured, meanwhile, the buffer groove 330 is annular and avoids the position of the positioning block 520, the exhaust pipeline 220 is communicated in the buffer groove 330, the gas generated in the forming cavity 310 can flow to the buffer groove 330 through the guide groove 320, and then is discharged out of the forming die from the exhaust pipeline, the annular buffer groove 330 improves the range in which the gas can be discharged, improves the exhaust effect, and the buffer groove 330 is deeper than the guide groove 320, reduces the generation of burrs of products, and improves the surface finish of the products.

In this embodiment, the positioning groove 410 is located in the middle of the bottom surface of the upper inner mold 210, the center of the annular buffer groove 330 coincides with the center of the upper inner mold 210, and the plurality of guide grooves 320 are all diverged from the center of the buffer groove 330 to the periphery as the middle point, so as to improve the air suction effect.

Further, a branch cavity 130 is defined between the upper die 110 and the lower die, one end of the branch cavity 130 is communicated with the forming cavity 310, and the other end of the branch cavity 130 is penetrated forward or backward.

Specifically, the forming die further includes a side core, the side core extends into the columnar structure along the inside of the branch cavity 130, after the product is formed, the side core can slide out along the extending direction of the parallel branch cavity 130 through the inclined guide pillar, a part of the forming cavity 310 can form a pipe body of the pipe connecting fitting 160, a branch pipe communicated with the pipe body can be formed between the branch cavity 130 and the columnar structure, and product forming is achieved. In addition, a cold water pipeline is arranged in the forming die and used for cooling after the forming die is formed.

In this embodiment, the enclosed molding cavities 310 have front and rear rows, each row has a plurality of molding cavities 310, the branch cavities 130 communicated with the front row of molding cavities 310 extend forward, the branch cavities 130 communicated with the rear row of molding cavities 310 extend backward, and each row of molding cavities 310 is correspondingly communicated with one exhaust pipeline 220 and one air suction piece 120 to facilitate molding, thereby improving production efficiency.

Further, the upper mold 110 is vertically penetrated with a glue outlet channel 140, the glue outlet channel 140 extends to the bottom surface of the upper mold 110, and a glue inlet 350 of the glue outlet channel 140 is opposite to the side wall of the bypass cavity 130. The upper die 110 and the lower die enclose the glue outlet channel 140 into a closed channel, the glue-diving port 350 is close to and opposite to the side wall of the branch cavity 130, raw materials pass through the upper die 110 downwards through the glue outlet channel 140 and flow at the glue outlet channel 140 between the upper die 110 and the lower die, and the raw materials are extruded into the branch cavity 130 and the forming cavity 310 through the glue-diving port 350.

Further, the upper die 110 is provided with an arc-shaped groove 151 and an air exhaust groove 152 which are sequentially communicated, the arc-shaped groove 151 is arranged around the forming cavity 310, and the air exhaust groove 152 extends to the side wall of the upper die 110 along the direction parallel to the branch cavity 130.

Specifically, the arc-shaped groove 151 is arranged around the cavity 310, the gas exhaust range is increased, the exhaust effect is improved, the gas of the arc-shaped groove 151 flows into the exhaust groove 152, meanwhile, the exhaust groove 152 is close to and parallel to the direction of the branch cavity 130 and extends to the side wall of the upper die 110, so that the gas generated by the product in the branch cavity 130 can flow into the exhaust groove 152, finally, the gas is exhausted out of the upper die 110, the exhaust effect of the outer surface in the product forming process is improved, the arc-shaped groove 151 is positioned between the sealing surfaces between the upper die 110 and the lower die, the exhaust of the deep-cavity tubular thin-wall product is ensured, and the surface finish of the product is improved. In this embodiment, in order to reduce the cost, the arc-shaped groove 151, the air-discharging groove 152 and the glue-discharging runner 140 are all disposed on the parting surface of the upper mold 110, and in order to ensure that the positions of the glue-discharging runner 140 and the glue-diving port 350 are avoided, only one side of the arc-shaped groove 151 is communicated with the air-discharging groove 152, in fact, both sides of the arc-shaped groove 151 may be communicated with the air-discharging grooves 152, the two air-discharging grooves 152 are respectively disposed on both sides of the branch cavity 130, so as to ensure the air-discharging effect, and then the glue-discharging runner 140 needs to be disposed at other positions opposite to the branch cavity 130.

While the preferred embodiments of the present utility model have been illustrated and described, the present utility model is not limited to the examples, and various equivalent modifications and substitutions can be made by one skilled in the art without departing from the spirit of the present utility model, and these equivalent modifications and substitutions are intended to be included in the scope of the present utility model as defined in the appended claims.

Claims (10)

1. A tubular product mold, characterized by: comprising the following steps:

the forming die comprises an upper die (110) and a lower die which can be mutually combined or separated, a plurality of tube cavities (111) are formed between the upper die (110) and the lower die in a surrounding mode, an upper inner die (210) is arranged at the inner top of the tube cavities (111) in the upper die (110), a lower inner die (510) is arranged at the inner bottom of the tube cavities (111) in the lower die, the bottom surface of the upper inner die (210) is abutted against the top surface of the lower inner die (510), a cavity (310) is formed between the outer wall of the upper inner die (210), the outer wall of the lower inner die (510) and the tube cavities (111) in a surrounding mode, and a guide groove (320) is formed in the bottom surface of the upper inner die (210);

and one end of the exhaust pipeline (220) is communicated with the outer wall of the upper die (110), and the guide groove (320) is respectively communicated with the other end of the exhaust pipeline (220) and the forming cavity (310).

2. A tubular product mould as claimed in claim 1, wherein: the outer wall of the upper die (110) is provided with a suction piece (120), and the suction piece (120) is communicated with the exhaust pipeline (220).

3. A tubular product mould as claimed in claim 1, wherein: the plurality of guide grooves (320) are circumferentially divergent with the exhaust pipe (220) as a center.

4. A tubular product mould according to claim 3, wherein: the middle part of the bottom surface of the upper inner die (210) is provided with a buffer groove (330), the guide groove (320) is communicated with the exhaust pipeline (220) through the buffer groove (330), and the depth of the buffer groove (330) is greater than that of the guide groove (320).

5. A tubular product mould as claimed in claim 1 or 4, wherein: the depth of the guide groove (320) is 0.01 mm-0.02 mm.

6. A tubular product mold according to claim 4, wherein: the bottom of the buffer groove (330) is provided with a supporting block (340), and the supporting block (340) is flush with the bottom surface of the upper inner die (210).

7. A tubular product mould as claimed in claim 1, wherein: the bottom surface of going up centre form (210) is equipped with constant head tank (410) and buffer tank (330), the top surface of lower centre form (510) be equipped with locating piece (520) that constant head tank (410) match, annular buffer tank (330) are around constant head tank (410) set up, exhaust pipe (220) intercommunication buffer tank (330), guide slot (320) both ends intercommunication respectively buffer tank (330) with shaping chamber (310), the degree of depth of buffer tank (330) is greater than the degree of depth of guide slot (320).

8. A tubular product mould as claimed in claim 1, wherein: a branch cavity (130) is formed between the upper die (110) and the lower die in a surrounding mode, one end of the branch cavity (130) is communicated with the forming cavity (310), and the other end of the branch cavity (130) is communicated forwards or backwards.

9. A tubular product mould as claimed in claim 8, wherein: the upper die (110) is vertically penetrated with a glue outlet flow channel (140), the glue outlet flow channel (140) extends to the bottom surface of the upper die (110), and a glue-diving port (350) of the glue outlet flow channel (140) is opposite to the side wall of the branch cavity (130).

10. A tubular product mould as claimed in claim 9, wherein: the upper die (110) is provided with an arc-shaped groove (151) and an exhaust groove (152) which are communicated in sequence, the arc-shaped groove (151) is arranged around the forming cavity (310), and the exhaust groove (152) extends to the side wall of the upper die (110) along the direction parallel to the branch cavity (130).