CN212219129U

CN212219129U - Mould for precise injection molding of gas delivery pipe

Info

Publication number: CN212219129U
Application number: CN202020633618.2U
Authority: CN
Inventors: 佘庆勋; 农良先; 王仕腾
Original assignee: Maolian Rubber Products Shenzhen Co ltd
Current assignee: Maolian Rubber Products Shenzhen Co ltd
Priority date: 2020-04-23
Filing date: 2020-04-23
Publication date: 2020-12-25
Anticipated expiration: 2030-04-23

Abstract

The utility model relates to a mould for precise injection moulding of a gas pipe, which comprises an upper mould and a lower mould, and also comprises a first mould core, a second mould core and a third mould core, wherein the first mould core comprises a rod-shaped first moulding part and a second moulding part which is fixedly connected with one end of the first moulding part and is used for moulding a first connecting head; the second mold core comprises a third molding part matched with the cavity and a supporting connecting part connected to one end of the third molding part; the third mold core is rod-shaped; the upper side of the lower die is provided with a first cavity, and the lower side of the upper die is provided with a second cavity; the first mold core, the second mold core, the third mold core, the first mold cavity and the second mold cavity form a product cavity for accommodating a product when the mold is closed, and the upper mold is provided with a pouring gate communicated with the second mold cavity. The utility model has the advantages that: can be used for injection molding the gas transmission pipe at one time, and has simple mold structure, low manufacturing cost and good quality of molded products.

Description

Mould for precise injection molding of gas delivery pipe

Technical Field

The utility model belongs to the technical field of gas-supply pipe injection moulding and specifically relates to a mould is used to accurate injection moulding of gas-supply pipe is related to.

Background

Referring to fig. 1, a novel gas pipe for a respirator comprises a pipe body 81, a first connector 82 connected and communicated with one end of the pipe body 81, a second connector 83 formed on the first connector 82, and a branch pipe port 84 connected and communicated with the outer peripheral wall of the pipe body 81 far away from the first connector 82; the inner wall of the pipe body 81 is smooth, the anti-folding reinforcing ribs spirally arranged on the outer wall along the length direction of the pipe body 81 are disconnected at the positions close to the branch pipe openings 84; the outer diameter of the first connector 82 is larger than that of the pipe body 81, and the joint of the first connector and the pipe body is in smooth transition; the second connector 83 is provided with a cavity 85 at the end not connected with the first connector 82. This novel defeated body 81 plans to adopt mould injection moulding, nevertheless how still need carry out detailed design to injection mold with the disposable injection moulding of gas-supply pipe to guarantee that mould simple structure, low in manufacturing cost, shaping product quality are good.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a mould for accurate injection moulding of gas-supply pipe, its advantage is: can be used for injection molding the gas transmission pipe at one time, and has simple mold structure, low manufacturing cost and good quality of molded products.

The above object of the present invention can be achieved by the following technical solutions: a mould for precise injection molding of a gas delivery pipe comprises an upper mould, a lower mould, a first mould core, a second mould core and a third mould core, wherein the first mould core comprises a rod-shaped first molding part and a second molding part which is fixedly connected to one end of the first molding part and is used for molding a first connecting head; the second mold core comprises a third molding part matched with the cavity and a supporting connecting part connected to one end of the third molding part; the third mold core is rod-shaped;

the upper side of the lower die is provided with a first cavity, and the lower side of the upper die is provided with a second cavity; one end of the first cavity is provided with a first supporting groove for embedding the end part of the first forming part, the other end of the first cavity is provided with a second supporting groove for embedding the end part of the second forming part corresponding to the first connector, a third supporting groove for embedding the supporting connecting part corresponding to the second connector, and a fourth supporting groove for embedding the end part of the third mold core is arranged beside the first cavity corresponding to the branch pipe opening;

a first accommodating groove for embedding the end part of the first forming part is formed in one end of the second cavity, a second accommodating groove for embedding the end part of the second forming part is formed in the other end of the second cavity corresponding to the first connector, a third accommodating groove for embedding the supporting connecting part is formed in the position corresponding to the second connector, and a fourth accommodating groove for embedding the end part of the third mold core is formed in one side of the second cavity corresponding to the branch pipe opening;

the first mold core, the second mold core, the third mold core, the first mold cavity and the second mold cavity form a product cavity for accommodating a product when the mold is closed, and the upper mold is provided with a pouring gate communicated with the second mold cavity.

Through the technical scheme, the mould can be used for injection molding the gas conveying pipe at one time, and has the advantages of simple structure, low manufacturing cost and good quality of a molded product.

When the gas pipe is injection molded, the upper die and the lower die are closed, and the liquid plastic enters the second cavity through the pouring gate; the first mold core is positioned in the first cavity and the second cavity, the end part of the first forming part extends into the first supporting groove and the first accommodating groove, and the end part of the second forming part extends into the second supporting groove and the second accommodating groove, so that the part of the first mold core positioned in the first cavity and the second cavity is not contacted with the cavity walls of the first cavity and the second cavity, and the pipe body and the first connecting joint are molded; the supporting connecting part is positioned in the third supporting groove and the third accommodating groove, and the third forming part extends into the first cavity and the second cavity, so that the second connector and a cavity on the second connector can be formed; one part of the third mold core is positioned in the fourth accommodating groove and the fourth supporting groove, and the other part of the third mold core extends into the first mold cavity and the second mold cavity and is abutted against the first mold core, so that the branch pipe opening is molded, and the branch pipe opening is communicated with the pipe body. After the injection molding is finished, the upper die and the lower die are opened, and then the first core, the second core and the third core are pulled out from the gas conveying pipe.

The utility model discloses further set up to: sliding grooves are formed in the upper side of the lower die and one end, away from the first cavity, of the fourth supporting groove, a sliding block is connected in the sliding grooves in a sliding mode, the sliding block slides in the sliding grooves along the length direction of the fourth supporting groove, and the third mold core is fixedly connected to one end, facing the first cavity, of the sliding block;

the upper part of the sliding block protrudes out of the upper surface of the lower die; and a fifth accommodating groove for accommodating the sliding block is arranged at one end of the lower side of the upper die and the end of the fourth accommodating groove, which are far away from the second cavity.

Through the technical scheme, the third mold core is small in size, easy to get rid of hands and easy to lose when falling to the ground, and the slide block is arranged to movably fix the third mold core on the lower mold, so that the third mold core is not easy to lose; meanwhile, after the injection molding is finished, the working personnel can also pull out the third mold core from the gas conveying pipe by sliding the sliding block along the sliding groove, so that the third mold core is more convenient to pull out.

The utility model discloses further set up to: one surface of the sliding block, which is back to the first cavity, is an inclined guide surface which inclines upwards, and one surface of the fifth accommodating groove, which is far away from the second cavity, is an inclined driving surface which inclines downwards; when the die is closed, the driving surface is pressed against the driving surface.

Through the technical scheme, when the upper die and the lower die are assembled, the sliding block can be extruded by the upper die in the direction of the first cavity, so that the first core and the third core are in close contact with each other, the pipe body is communicated with the branch pipe port, and the yield of products is improved.

The utility model discloses further set up to: an inclined guide rod is fixed at the bottom of the fifth accommodating groove, one end of the inclined guide rod is fixed with the upper die, and the other end of the inclined guide rod extends downwards in an inclined mode in the direction away from the second cavity; and the sliding block is provided with an inclined guide hole in sliding fit with the inclined guide rod.

By the technical scheme, the inclined guide rod is inserted into the inclined guide hole in the die closing state; when the upper die gradually leaves the lower die, the inclined guide rod is slowly drawn out of the inclined guide hole, so that the slide block is pushed to move towards the direction far away from the first cavity, and the third core is pulled out of a branch pipe opening of the gas conveying pipe; when the upper die is gradually close to the lower die, the inclined guide rod is inserted into the inclined guide hole instead, so that the sliding block is pushed to move towards the direction close to the first cavity, and the third core is abutted against the first core.

The utility model discloses further set up to: two guide rails connected with the lower die through bolts are arranged in the sliding groove, and a guide groove is formed in the lower part of one opposite side of the two guide rails; and a sliding strip in sliding fit with the guide groove is integrally formed on the sliding block.

Through above-mentioned technical scheme, slide the slider and be connected to in the spout, and the setting of guide rail and draw runner makes the slider can not break away from in the spout along vertical direction.

The utility model discloses further set up to: two fifth supporting grooves are formed in the lower die; one of the two fifth supporting grooves is communicated with the first supporting groove, and the other fifth supporting groove is communicated with the second supporting groove and the third supporting groove; positioning rods are arranged in the two fifth supporting grooves and limit the first mold core to move along the length direction of the first mold core during injection molding; the second core is fixed on a positioning rod;

and a sixth accommodating groove for accommodating the positioning rod is formed in the lower side of the upper die.

Through above-mentioned technical scheme, the setting of locating lever can be fixed a position first core and second core, avoids when moulding plastics, and first core takes place to remove, leads to the unqualified condition of product.

The utility model discloses further set up to: a first opening for the second forming part to penetrate through is formed in the lower side of the positioning rod connected with the second mold core, a pin hole communicated with the first opening is formed in the upper side of the positioning rod, and a limiting pin is arranged in the pin hole; and the second forming part is provided with a limiting hole which is in plug-in fit with the limiting pin.

Through above-mentioned technical scheme, can avoid when moulding plastics, first core takes place to rotate and leads to the unqualified condition of product.

The utility model discloses further set up to: a positioning column is fixed in the fifth supporting groove, and a positioning hole is formed in the positioning column.

Through above-mentioned technical scheme, can fix a position the locating lever.

The utility model discloses further set up to: the fifth supporting groove penetrates through two opposite sides of the lower die, and two ends of the positioning rod extend out of the fifth supporting groove.

Through above-mentioned technical scheme, the staff of being convenient for takes out the locating lever from the fifth support groove.

The utility model discloses further set up to: a plurality of positioning guide columns are fixed on the lower side of the upper die; and a plurality of positioning guide holes are formed in the upper side of the lower die.

Through the technical scheme, the mold closing precision is effectively improved.

To sum up, the utility model discloses a beneficial technological effect does:

1. the mould can be used for injection molding the gas transmission pipe at one time, and has the advantages of simple structure, low manufacturing cost and good quality of molded products;

2. the inclined guide surface and the driving surface are arranged, so that when the upper die and the lower die are closed, the sliding block can be extruded by the upper die in the direction of the first cavity, the first core is tightly contacted with the third core, the pipe body is communicated with the branch pipe port, and the yield of products is improved;

3. the fifth supporting groove penetrates through the two opposite sides of the lower die, the two ends of the positioning rod extend out of the fifth supporting groove, and the positioning rod can be conveniently taken out of the fifth supporting groove by workers.

Drawings

FIG. 1 is a schematic view showing the structure of a gas delivery pipe disclosed in the background art;

FIG. 2 is a schematic overall structure diagram of the first embodiment;

FIG. 3 is an exploded view of the structure of a lower die in accordance with one embodiment;

FIG. 4 is an exploded view of the upper die structure in accordance with one embodiment;

FIG. 5 is a schematic view showing a structure of a slider according to a second embodiment;

fig. 6 is a schematic view of a structure of a diagonal guide bar according to a second embodiment.

In the figure, 1, an upper die; 11. a second cavity; 12. a first accommodating groove; 13. a second accommodating groove; 14. a third accommodating groove; 15. a fourth accommodating groove; 16. a fifth accommodating groove; 17. a sixth accommodating groove; 18. positioning a guide post; 2. a lower die; 21. a first cavity; 22. a first support groove; 23. a second support groove; 24. a third support groove; 25. a fourth support groove; 27. a fifth support groove; 28. positioning a guide hole; 3. a first core; 31. a first molding section; 32. a second molding section; 33. a limiting hole; 4. a second core; 5. a third core; 51. a slider; 52. an inclined guide rod; 53. oblique guide holes; 54. a guide rail; 55. a guide groove; 56. a slide bar; 6. a gate; 7. positioning a rod; 71. a first gap; 72. a pin hole; 73. a spacing pin; 74. a positioning column; 75. positioning holes; 76. a second gap; 81. a pipe body; 82. a first connector; 83. a second connector; 84. a branch pipe orifice; 85. a cavity.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The first embodiment is as follows:

referring to fig. 2 and 3, for the utility model discloses a mould for precise injection moulding of gas transmission pipe, including last mould 1, lower mould 2 and first core 3, second core 4 and the third core 5 of setting between last mould 1 and lower mould 2. The first core 3 includes a rod-shaped first molding portion 31 and a second molding portion 32 integrally molded at one end of the first molding portion 31, the first molding portion 31 is fitted inside the pipe body 81, and the second molding portion 32 is fitted inside the first connector 82. The second core 4 comprises a third forming part matched with the cavity and a supporting connecting part integrally formed and connected to one end of the third forming part. The third mold core 5 is in a shape of a round bar and is matched with the inner part of the branch pipe port 84 of the air delivery pipe, and one end surface of the third mold core 5 is a concave surface matched with the first forming part 31.

Referring to fig. 3 and 4, a first cavity 21 is formed in the upper side of the lower die 2, a second cavity 11 is formed in the lower side of the upper die 1, and when the upper die 1 and the lower die 2 are closed, the first cavity 21 and the second cavity 11 form a cavity just accommodating the gas pipe. The four corners of the lower side of the upper die 1 are all fixed with positioning guide posts 18, and the four corners of the upper side of the lower die 2 are provided with positioning guide holes 28 matched with the positioning guide posts 18. Referring to fig. 2 and 4, a plurality of gates 6 (eight gates 6 are provided in this embodiment) are provided on the upper mold 1 at intervals along the length direction of the second cavity 11.

Referring to fig. 3, a fourth supporting groove 25 for the third core 5 to be inserted is formed beside the first cavity 21 corresponding to the branch pipe opening 84, and the fourth supporting groove 25 is communicated with the first cavity 21. A sliding groove is formed in one end, away from the first cavity 21, of the fourth supporting groove 25 on the upper side of the lower die 2, a sliding block 51 is connected in the sliding groove in a sliding mode, specifically, two guide rails 54 which are connected with the lower die 2 through bolts are arranged in the sliding groove, and a guide groove 55 is formed in the lower portion of one opposite side of each of the two guide rails 54; the slider 51 is disposed between the two guide rails 54, and a slide bar 56 slidably engaged with the guide groove 55 is integrally formed on the slider 51. The slide block 51 slides in the slide groove along the length direction of the fourth support groove 25 under the restriction of the guide rail 54, and the guide rail 54 and the slide bar 56 are arranged so that the slide block 51 cannot be disengaged from the slide groove in the vertical direction. The third mold core 5 is slidably disposed in the fourth supporting groove 25, and one end of the third mold core 5, which is not provided with a concave surface, is fixedly connected with the slide block 51.

Referring to fig. 3, the upper part of the slider 51 protrudes out of the upper surface of the lower die 2, a fourth receiving groove 15 for the third mold core 5 to be embedded and communicated with the second mold cavity 11 is arranged at the lower side of the upper die 1 and a position corresponding to the branch pipe orifice 84 beside the second mold cavity 11, and a fifth receiving groove 16 for receiving the slider 51 is arranged at one end of the fourth receiving groove 15 away from the second mold cavity 11; the surface of the slider 51 facing away from the first cavity 21 is an inclined guide surface facing upward, and the surface of the fifth receiving groove 16 facing away from the second cavity 11 is a drive surface facing downward. When the die is closed, the driving surface is pressed against the driving surface, so that the first mold core 3 is tightly contacted with the third mold core 5, the pipe body 81 is ensured to be communicated with the branch pipe port 84, and the yield of products is improved.

Referring to fig. 3, a second supporting groove 23 for embedding the end of the second forming portion 32 is formed at one end of the first cavity 21 corresponding to the first connecting head 82, a third supporting groove 24 for embedding the supporting connecting portion is formed at the position corresponding to the second connecting head 83, a first supporting groove 22 for embedding the first forming portion 31 is formed at the other end of the first cavity, and the first supporting groove 22, the second supporting groove 23, and the third supporting groove 24 are all communicated with the first cavity 21. Two fifth supporting grooves 27 are further formed in the upper side of the lower die 2; of the two fifth supporting grooves 27, one fifth supporting groove 27 is communicated with the first supporting groove 22, the other fifth supporting groove 27 is communicated with the second supporting groove 23 and the third supporting groove 24, and the two fifth supporting grooves 27 are all provided with the positioning rod 7, which is noteworthy: the fifth supporting grooves 27 penetrate through opposite sides of the lower mold 2, and both ends of the positioning rod 7 extend out of the fifth supporting grooves 27. The third forming section of the second core 4 is located in the first forming section, and the support connection section is located in the third support groove 24 and fixed to one positioning rod 7.

Referring to fig. 2 and 3, a first opening 71 for the second forming portion 32 to penetrate through is formed in the lower side of the positioning rod 7 connected to the second core 4, a pin hole 72 communicated with the first opening 71 is formed in the upper side of the positioning rod 7, and a limit pin 73 is arranged in the pin hole 72; the second forming portion 32 is provided with a limiting hole 33 which is inserted and matched with the limiting pin 73. Referring to the figure, a second notch 76 for the first forming portion 31 to penetrate is formed at the lower side of the positioning rod 7 which is not connected with the second core 4. Referring to the figure, the first mold core 3 is located in the first mold cavity 21, the first molding part 31 penetrates through the first supporting groove 22 and extends into the second gap 76, the second molding part 32 penetrates through the second supporting groove 23 and extends into the first gap 71, and the part of the first mold core 3 located in the first mold cavity 21 is not contacted with the wall of the first mold cavity 21. The setting of locating lever 7 and spacer pin 73 can be fixed first core 3, avoids first core 3 to take place displacement and rotation when moulding plastics.

Referring to fig. 3, two positioning posts 74 are fixed in the fifth supporting groove 27, and two positioning holes 75 matched with the positioning posts 74 are formed in the positioning rod 7.

Referring to fig. 4, a second receiving groove 13 for embedding the end of the second forming portion 32 is disposed at a position corresponding to the first connecting head 82 of the second cavity 11, a third receiving groove 14 for embedding the supporting connecting portion is disposed at a position corresponding to the second connecting head 83, a first receiving groove 12 for embedding the end of the first forming portion 31 is disposed at the other end of the second cavity 11, and the first receiving groove 12, the second receiving groove 13, and the third receiving groove 14 are all communicated with the second cavity 11. A sixth accommodating groove 17 for accommodating the positioning rod 7 is further formed in the lower side of the upper die 1.

The implementation principle of the embodiment is as follows: when the gas pipe is injection molded, the upper die 1 and the lower die 2 are closed, the first die core 3, the second die core 4, the third die core 5, the first die cavity 21 and the second die cavity 11 form a product cavity 85 for accommodating a product, and liquid plastic enters the product cavity 85 through the pouring gate 6, so that the gas pipe is injection molded. After the injection molding is completed, the upper die 1 and the lower die 2 are opened, then the sliding block 51 is slid, the third core 5 is pulled out from the vertical gas transmission pipe, then the fixed rod, the first core 3, the second core 4 and the gas transmission pipe are taken down from the lower die 2, then the second core 4 is pulled out from the gas transmission pipe, and then the first core 3 is pulled out from the gas transmission pipe.

Example two:

referring to fig. 5 and 6, the difference between the present embodiment and the first embodiment is that a slope guide 52 is fixed at the bottom of the fifth receiving groove 16, one end of the slope guide 52 is fixed with the upper die 1, and the other end extends in a direction away from the second cavity 11; the slider 51 is provided with an inclined guide hole 53 which is slidably fitted with the inclined guide rod 52. In a mold closing state, the inclined guide rod 52 is inserted into the inclined guide hole 53; when the upper die 1 gradually leaves the lower die 2, the inclined guide rod 52 is slowly drawn out of the inclined guide hole 53, so that the slide block 51 is pushed to move in the direction away from the first cavity 21, and the third core 5 is pulled out of the branch pipe port 84 of the air delivery pipe; when the upper mold 1 gradually approaches the lower mold 2, the inclined guide 52 is inserted into the inclined guide hole 53, thereby pushing the slider 51 to move in a direction approaching the first cavity 21, so that the third core 5 abuts on the first core 3.

The embodiment of this specific implementation mode is the preferred embodiment of the present invention, not limit according to this the utility model discloses a protection scope, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims

1. The utility model provides a mould for gas-supply pipe precision injection moulding, includes mould (1) and lower mould (2), characterized by: the mold further comprises a first mold core (3), a second mold core (4) and a third mold core (5), wherein the first mold core (3) comprises a rod-shaped first molding part (31) and a second molding part (32) which is fixedly connected to one end of the first molding part (31) and is used for molding a first connecting head (82); the second mold core (4) comprises a third molding part matched with the cavity and a support connecting part connected to one end of the third molding part; the third mold core (5) is rod-shaped;

a first cavity (21) is formed in the upper side of the lower die (2), and a second cavity (11) is formed in the lower side of the upper die (1); one end of the first cavity (21) is provided with a first supporting groove (22) for embedding the end part of the first forming part (31), the other end of the first cavity is provided with a second supporting groove (23) for embedding the end part of the second forming part (32) corresponding to the first connector (82), a third supporting groove (24) for embedding the supporting connecting part corresponding to the second connector (83), and a fourth supporting groove (25) for embedding the end part of the third mold core (5) is arranged beside the first cavity (21) corresponding to the branch pipe opening (84);

a first accommodating groove (12) for embedding the end part of the first forming part (31) is formed in one end of the second cavity (11), a second accommodating groove (13) for embedding the end part of the second forming part (32) is formed in the position, corresponding to the first connecting head (82), of the other end of the second cavity, a third accommodating groove (14) for embedding the supporting connecting part is formed in the position, corresponding to the second connecting head (83), of the other end of the second cavity, and a fourth accommodating groove (15) for embedding the end part of the third mold core (5) is formed in the position, corresponding to the branch pipe opening (84), of the second cavity (11);

the mould comprises a first mould core (3), a second mould core (4), a third mould core (5), a first mould cavity (21) and a second mould cavity (11), wherein a product cavity (85) for accommodating a product is formed when the first mould core, the second mould core (4), the third mould core (5), the first mould cavity and the second mould cavity (11) are closed, and a pouring gate (6) communicated with the second mould cavity (11) is arranged on the upper mould (1).

2. The mold for precision injection molding of the gas delivery pipe according to claim 1, characterized in that: a sliding groove is formed in the upper side of the lower die (2) and one end, away from the first cavity (21), of the fourth supporting groove (25), a sliding block (51) is connected in the sliding groove in a sliding mode, the sliding block (51) slides in the sliding groove along the length direction of the fourth supporting groove (25), and the third mold core (5) is fixedly connected to one end, facing the first cavity (21), of the sliding block (51);

the upper part of the sliding block (51) protrudes out of the upper surface of the lower die (2); one end, away from the second cavity (11), of the lower side of the upper die (1) and one end, away from the fourth accommodating groove (15), of the upper die are provided with a fifth accommodating groove (16) used for accommodating the sliding block (51).

3. The mold for precision injection molding of the gas delivery pipe according to claim 2, characterized in that: one surface of the sliding block (51) back to the first cavity (21) is an inclined guide surface which inclines upwards, and one surface of the fifth accommodating groove (16) far away from the second cavity (11) is a driving surface which inclines downwards; when the die is closed, the driving surface is pressed against the driving surface.

4. The mold for precision injection molding of the gas delivery pipe according to claim 2, characterized in that: an inclined guide rod (52) is fixed at the bottom of the fifth accommodating groove (16), one end of the inclined guide rod (52) is fixed with the upper die (1), and the other end of the inclined guide rod extends in a direction away from the second cavity (11) in an inclined and downward mode; the slide block (51) is provided with an inclined guide hole (53) which is in sliding fit with the inclined guide rod (52).

5. The mold for precision injection molding of the gas delivery pipe according to claim 2, characterized in that: two guide rails (54) which are connected with the lower die (2) through bolts are arranged in the sliding grooves, and a guide groove (55) is formed in the lower part of one opposite side of each of the two guide rails (54); and a sliding strip (56) in sliding fit with the guide groove (55) is integrally formed on the sliding block (51).

6. The mold for precision injection molding of the gas delivery pipe according to claim 1, characterized in that: two fifth supporting grooves (27) are formed in the lower die (2); one of the two fifth support grooves (27) is communicated with the first support groove (22), and the other fifth support groove (27) is communicated with the second support groove (23) and the third support groove (24); positioning rods (7) are arranged in the two fifth supporting grooves (27), and the positioning rods (7) limit the movement of the first mold core (3) along the length direction of the first mold core (3) during injection molding; the second mold core (4) is fixed on a positioning rod (7);

and a sixth accommodating groove (17) for accommodating the positioning rod (7) is formed in the lower side of the upper die (1).

7. The mold for precision injection molding of the gas delivery pipe according to claim 6, characterized in that: a first notch (71) for the second forming part (32) to penetrate through is formed in the lower side of a positioning rod (7) connected with the second mold core (4), a pin hole (72) communicated with the first notch (71) is formed in the upper side of the positioning rod (7), and a limiting pin (73) is matched in the pin hole (72); and the second forming part (32) is provided with a limiting hole (33) which is in plug-in fit with the limiting pin (73).

8. The mold for precision injection molding of the gas delivery pipe according to claim 6, characterized in that: a positioning column (74) is fixed in the fifth supporting groove (27), and a positioning hole (75) is formed in the positioning rod (7).

9. The mold for precision injection molding of the gas delivery pipe according to claim 6, characterized in that: the fifth supporting grooves (27) penetrate through two opposite sides of the lower die (2), and two ends of the positioning rods (7) extend out of the fifth supporting grooves (27).

10. The mold for precision injection molding of the gas delivery pipe according to claim 1, characterized in that: a plurality of positioning guide posts (18) are fixed on the lower side of the upper die (1); the upper side of the lower die (2) is provided with a plurality of positioning guide holes (28).