CN212194031U - Mould with main sprue lengthening structure - Google Patents

Abstract

The utility model discloses a mould with main purt mouth adds long structure, including main purt mouth, cover half and with cover half matched with movable mould, be equipped with the hot runner in the cover half, main purt mouth has the runner of running through its axial purt mouth, and the one end of main purt mouth is embedded in on the cover half, and purt mouth runner lug connection in hot runner, the other end of main purt mouth run through in the movable mould in order to be used for butt gun mouth, movable mould and main purt mouth sliding connection. The utility model cancels the runner of the butt-collision nozzle in the traditional stack mould, designs an extended main squirt nozzle which is directly embedded on the fixed mould, the runner of the squirt nozzle is directly communicated with the hot runner, the thickness of the template which is originally provided with the runner of the butt-collision nozzle can be reduced, thereby the whole thickness of the mould can be correspondingly reduced, and the required injection pressure is also reduced; moreover, because the lengthened main sprue bushing is embedded on the fixed die, the sprue bushing is cancelled, the sprue bushing is directly communicated with the hot runner, no material handle is generated in the die, and the installation is convenient.

Description

Mould with main sprue lengthening structure

Technical Field

The utility model relates to a technical field of structure of mould especially relates to a mould with main purt mouth extension structure.

Background

When a product is formed by the traditional stack mold, the rubber material is ejected from a gun nozzle, flows into the butt nozzle flow passage through the main sprue flow passage, then flows into the hot runner and finally enters a product cavity.

However, the flow of the opposite-collision nozzle flow channel of the stack mold is long, the total thickness of the stack mold is easily thick and often exceeds the capacitance modulus of an injection molding machine, the required injection pressure is also large, the feasibility is poor, and a material handle is easily generated between two adjacent opposite-collision nozzles in the opposite-collision nozzle flow channel of the stack mold after the injection molding is completed.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the utility model aims to provide a mould with main purt mouth extension structure, it aims at solving the problem that the flow of the mouth runner is longer to bumping of the stack mould on the current market, and stack mould total thickness is thicker, and required injection pressure is also great, and the technical problem of raw material handle is produced easily to bumping between the mouth in adjacent two pairs in the mouth runner moreover.

In order to achieve the above purpose, the utility model provides a scheme is:

the utility model provides a mould with main purt mouth adds long structure, including main purt mouth, cover half and with cover half matched with movable mould, be equipped with the hot runner in the cover half, main purt mouth has the purt mouth runner that runs through its axial, the one end of main purt mouth imbed in on the cover half, purt mouth runner lug connection in the hot runner, the other end of main purt mouth run through in the movable mould is in order to be used for butt big gun mouth, the movable mould with main purt mouth sliding connection.

Furthermore, the main squirt nozzle comprises a main squirt nozzle head, a main squirt nozzle body and a plurality of limiting parts arranged at intervals, one end of the main squirt nozzle body is embedded on the fixed die, the other end of the main squirt nozzle body penetrates through the movable die, and the main squirt nozzle head is embedded on one side, far away from the fixed die, of the main squirt nozzle body in a sliding mode through the limiting parts.

Further, the distance from the end part of the main squirt nozzle head far away from the movable die to the movable die is larger than the stroke of the movable die.

Furthermore, the main squirt nozzle head is provided with a first flow passage running through the axial direction of the main squirt nozzle head, the main squirt nozzle body is provided with a second flow passage, one end of the second flow passage is communicated with the first flow passage, the other end of the second flow passage is communicated with the hot runner, and the first flow passage and the second flow passage form the squirt nozzle flow passage.

Further, the mouth head of main purt head is equipped with the mouth head body of first runner in including and protruding the locating the annular lug at mouth head body outside middle part, the locating part include screw rod portion and with a screw head of screw rod portion end connection, the interval is equipped with the first perforation of a plurality of on the annular lug, keeping away from of the mouth body of main purt one side of cover half be equipped with slot and a plurality of ring that the second runner is linked together locate the first mounting hole in the slot outside, the mouth head body insert in the slot, screw rod portion passes first perforation after-fixing in the first mounting hole, just the screw head with be equipped with the interval between the annular lug.

Furthermore, the die with the main sprue lengthening structure also comprises a plurality of fasteners and a central positioning block with a plurality of second through holes, the fixed die comprises a first die plate and a second die plate arranged between the first die plate and the movable die, the first die plate is internally provided with the hot runner, an insertion hole communicated with the hot runner for inserting the main sprue and a plurality of third through holes arranged at intervals with the hot runner, the second template is provided with a fourth through hole, one side of the main squirt nozzle facing the central positioning block is provided with a plurality of second mounting holes, the central positioning block is embedded in one side of the first template far away from the second template, the main squirt nozzle passes through the fourth through hole and then is positioned in the insertion hole, the fastener passes through the second through hole and the third through hole and then is fixed in the second mounting hole.

Further, the central locating piece includes the positioning disk and protruding locating the reference column at positioning disk middle part, keeping away from of first template the concave mounting groove and the draw-in groove of being equipped with in one side of second template, the mounting groove has the tank bottom surface, the draw-in groove is concave to be located on the tank bottom surface, the positioning disk install in the mounting groove just the reference column install in the draw-in groove.

Further, the mould with main sprue bush extension structure still includes wear-resisting piece and flange, wear-resisting piece is the annular, the movable mould has the confession the fifth perforation that main sprue bush wore to establish, the fenestrate inside wall of fifth is from the tip of movable mould to cover half one side is concave in proper order and is equipped with first ring channel and with the second ring channel that first ring channel is linked together, the diameter of first ring channel is greater than the diameter of second ring channel, wear-resisting piece cover is located outside the main sprue bush and install in the second ring channel, the flange mounting in first ring channel and butt in wear-resisting piece, and the internal diameter of flange is greater than the internal diameter of wear-resisting piece.

Further, the die with the main sprue lengthening structure further comprises a protective sleeve, the protective sleeve is cylindrical, a third annular groove communicated with the second annular groove is further concavely formed in the inner side wall of the fifth through hole, the third annular groove and the first annular groove are respectively arranged on two opposite sides of the second annular groove, the inner diameter of the second annular groove is larger than that of the third annular groove, the protective sleeve is installed in the third annular groove and abutted to the wear-resistant block, and the inner diameter of the protective sleeve is larger than that of the wear-resistant block.

Further, the mould that has main purt extension structure still includes a plurality of heating member, the lateral wall of main purt still is equipped with the holding tank that a plurality of interval set up, heating member install in the holding tank.

Compared with the prior art, the beneficial effects of the utility model reside in that:

compared with the prior art, the utility model cancels the butt-collision nozzle flow passage in the traditional stack mould, designs an elongated main squirt nozzle which is directly embedded on the fixed mould, the squirt nozzle flow passage is directly communicated with the hot runner, the thickness of the template which is originally provided with the butt-collision nozzle flow passage can be reduced, thereby the whole thickness of the mould can be correspondingly reduced, and the required injection pressure is also reduced;

moreover, because the lengthened main sprue bushing is embedded on the fixed die, the sprue bushing is cancelled, the sprue bushing is directly communicated with the hot runner, no material handle is generated in the sprue bushing, and the installation is convenient.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a partial cross-sectional view of a die having a main squirt nozzle extension structure according to an embodiment of the present invention;

FIG. 2 is an enlarged partial schematic view at A of FIG. 1;

FIG. 3 is an enlarged partial schematic view at B of FIG. 1;

FIG. 4 is an enlarged partial schematic view at C of FIG. 1;

FIG. 5 is a cross-sectional view of a main pump head according to an embodiment of the present invention;

fig. 6 is a cross-sectional view of a center positioning block according to an embodiment of the present invention;

fig. 7 is a cross-sectional view of a first form provided by an embodiment of the present invention;

fig. 8 is a cross-sectional view of a fourth form provided by an embodiment of the present invention.

The reference numbers illustrate:

10. a main squirt nozzle; 11. a sprue channel; 12. a main squirt nozzle head; 121. a first flow passage; 122. a nozzle tip body; 123. an annular ledge; 1231. a first perforation; 13. a main squirt nozzle body; 131. a second flow passage; 14. a limiting member; 141. a screw section; 142. a screw head; 15. accommodating grooves; 20. fixing a mold; 21. a first template; 211. a hot runner; 212. an insertion hole; 213. a third perforation; 214. mounting grooves; 2141. the bottom surface of the groove; 215. a card slot; 22. a second template; 221. a plate body; 222. a fourth perforation; 30. moving the mold; 31. a fifth perforation; 32. a first annular groove; 33. a second annular groove; 34. a third annular groove; 35. a third template; 36. a fourth template; 40. a fastener; 50. a central positioning block; 51. a second perforation; 52. positioning a plate; 521. sinking a groove; 53. a positioning column; 60. a wear-resistant block; 70. a flange; 80. a protective sleeve; 90. a heating member.

Detailed Description

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

It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.

It will also be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit ly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

Referring to fig. 1 to 4, an embodiment of the present invention provides a mold with a main sprue lengthening structure, which is referred to as a mold hereinafter, the mold is a mold stack mold, the mold includes a main sprue 10, a fixed mold 20 and a movable mold 30 matched with the fixed mold 20, one end of the main sprue 10 is used for abutting against a nozzle of an injection molding machine, and the other end of the main sprue 10 is fixed on the fixed mold 20 after passing through the movable mold 30.

Specifically, a hot runner 211 communicated with a product cavity is arranged in the fixed mold 20, the main sprue 10 is provided with a sprue channel 11 penetrating through the fixed mold in the axial direction, one end of the main sprue 10 is embedded in the fixed mold 20, the sprue channel 11 on the main sprue 10 is directly connected to the hot runner 211, the other end of the main sprue 10 penetrates through the movable mold 30 to be abutted to the sprue, and the movable mold 30 is in sliding connection with the main sprue 10 so as to facilitate mold opening of the mold. In the embodiment, the glue solution ejected from the gun nozzle directly flows into the hot runner 211 through the sprue bushing runner 11, the previous butt nozzle runner is eliminated, the thickness of the original template provided with the butt nozzle runner can be reduced, the whole thickness of the whole stack mold can be correspondingly reduced, and the injection pressure required by the mold is also reduced.

Referring to fig. 2 and 5, the main squirt nozzle 10 includes a main squirt nozzle head 12, a main squirt nozzle body 13 and a plurality of spacing members 14, one end of the main squirt nozzle body 13 is embedded in the fixed mold 20, the other end of the main squirt nozzle body 13 passes through the movable mold 30, the main squirt nozzle head 12 is embedded in one side of the main squirt nozzle body 13 away from the fixed mold 20 through the spacing members 14 in a sliding manner, the main squirt nozzle head 12 is used for abutting against the gun nozzle, the movable mold 30 can slide on one part of the main squirt nozzle head 12 and the main squirt nozzle body 13, the squirt nozzle channel 11 sequentially passes through the main squirt nozzle head 12 and the main squirt nozzle body 13, and since the main squirt nozzle 10 and the gun nozzle need to be re-aligned in each mold change, the damage due to collision is avoided, the embodiment can achieve the purpose of reducing the maintenance cost by directly replacing the main squirt nozzle head 12.

In a preferred embodiment, the distance from the end of the main squirt nozzle head 12 away from the movable mold 30 to the movable mold 30 is greater than the moving stroke of the movable mold 30, so that the movable mold 30 has a sufficient stroke when the mold is opened.

The main squirt nozzle head 12 is provided with a first flow passage 121 running through the axial direction of the main squirt nozzle head, the main squirt nozzle body 13 is provided with a second flow passage 131, one end of the second flow passage 131 is communicated with the first flow passage 121, the other end is communicated with a hot runner 211, the first flow passage 121 and the second flow passage 131 form the squirt nozzle flow passage 11, and glue solution ejected by a gun nozzle sequentially passes through the first flow passage 121, the second flow passage 131 and the hot runner 211 and then enters a product cavity.

The main squirt nozzle head 12 of the present embodiment is embedded on the main squirt nozzle body 13, that is, a part of the main squirt nozzle head 12 extends into the main squirt nozzle body 13, specifically, the main squirt nozzle head 12 includes a nozzle head body 122 provided with a first flow channel 121 therein and an annular lug 123 protruding from the middle portion of the outer side of the nozzle head body 122, the limiting member 14 includes a screw rod portion 141 and a screw head 142 connected with one end portion of the screw rod portion 141, a plurality of first through holes 1231 are provided at intervals on the annular lug 123, a slot communicated with the second flow channel 131 and a plurality of first mounting holes matched with the first through holes 1231 are concavely provided on one side of the main squirt nozzle body 13 away from the fixed mold 20, the plurality of first mounting holes are annularly provided on the outer side of the slot, one end of the nozzle head body 122 close to the fixed mold 20 is inserted into the slot, and the main squirt nozzle head 12 can slide in the slot along the axial direction thereof, the screw rod portion 141 is fixed in the first mounting holes 1231 after, and a space is provided between the screw head 142 and the annular boss 123 to limit the sliding distance of the main squirt nozzle head 12.

In the embodiment, when the gun nozzle stops injecting glue, the pressure in the hot runner 211 of the mold is not released, at this time, after the gun nozzle is retreated to the sliding distance controlled by the limiting part 14, the main squirt nozzle head 12 slides backwards along with the pressure of the glue solution in the hot runner 211 to release the pressure in the hot runner 211, so that the glue solution flows out rarely, the glue material is saved, and the problems of wire drawing and tape casting of the glue nozzle can be effectively solved.

Meanwhile, when the gun nozzle stops injecting glue and the main squirt nozzle head 12 moves backwards relative to the main squirt nozzle body 13, glue remains in the first flow channel 121 and the second flow channel 131, at this time, a part of the slot is exposed to be used as the second flow channel 131, and the glue has viscosity and does not flow into the exposed part of the slot too much, so that the inner diameter of the first flow channel 121 close to the second flow channel 131 in the embodiment must be slightly smaller than the inner diameter of the second flow channel 131 close to the first flow channel 121, therefore, the first flow channel 121 close to the second flow channel 131 can be designed into a horn shape, and thus, a material handle can be well prevented from appearing in the main squirt nozzle flow channel 11.

Referring to fig. 1, 4, 6 and 7, the mold with the main squirt nozzle lengthening structure further includes a plurality of fasteners 40 and a central positioning block 50 having a plurality of second through holes 51, the fixed mold 20 includes a first mold plate 21 and a second mold plate 22 disposed between the first mold plate 21 and the movable mold 30, the second mold plate 22 is formed by stacking three plate bodies 221 disposed side by side, the first mold plate 21 is provided with the hot runner 211, an insertion hole 212 communicating with the hot runner 211 for inserting the main squirt nozzle 10, and a plurality of third through holes 213 disposed at intervals with the hot runner 211, the second mold plate 22 is provided with fourth through holes 222, one side of the main squirt nozzle 10 facing the central positioning block 50 is provided with a plurality of second mounting holes, the central positioning block 50 is embedded in a side of the first mold plate 21 away from the second mold plate 22, the main squirt nozzle 10 is positioned in the insertion hole 212 after passing through the fourth through holes 222, the fasteners 40 are fixed in the second mounting holes after passing through the second through holes 51 and the third through holes 213, the central positioning block 50 can effectively position the main squirt nozzle 10, prevent the main squirt nozzle 10 from loosening and leaking glue when stressed, and is convenient to disassemble and assemble the die.

The central positioning block 50 includes a positioning plate 52 and a positioning post 53 protruding from the middle of the positioning plate 52, a mounting groove 214 and a locking groove 215 are concavely disposed on one side of the first mold plate 21 away from the second mold plate 22, the mounting groove 214 has a groove bottom surface 2141, the locking groove 215 is concavely disposed on the groove bottom surface 2141, the positioning plate 52 is mounted in the mounting groove 214, and the positioning post 53 is mounted in the locking groove 215, so as to further accurately fix the main squirt nozzle 10 on the fixed mold 20, a sinking groove 521 for accommodating the fastening member 40 is concavely disposed on one side of the positioning plate 52 away from the positioning post 53, and the sinking groove 521 is communicated with the second through hole 51.

Referring to fig. 3 and 8, as a preferred embodiment, the mold with the lengthening structure of the main squirt nozzle further includes a wear-resistant block 60 and a flange 70, the wear-resistant block 60 is annular, the movable mold 30 has a fifth through hole 31 for the main squirt nozzle 10 to penetrate through, a first annular groove 32 and a second annular groove 33 communicated with the first annular groove 32 are sequentially recessed from the end of the movable mold 30 toward the fixed mold 20 on the inner side wall of the fifth through hole 31, the diameter of the first annular groove 32 is larger than that of the second annular groove 33, the wear-resistant block 60 is sleeved outside the main nozzle 10 and is installed in the second annular groove 33, the flange 70 is installed in the first annular groove 32 and abuts against the wear-resistant block 60, the inner diameter of the flange 70 is larger than that of the wear-resistant block 60, the inner ring of the wear-resistant block 60 abuts against the main sprue 10, the flange 70 and the main sprue 10 are in clearance fit, and the main sprue body 13 and the movable die 30 in the embodiment are positioned through the wear-resistant block 60, so that the deformation and glue leakage caused by the fact that the main sprue 10 is not concentric with a gun nozzle when being stressed can be prevented.

As a preferred embodiment, the mold with the main sprue lengthening structure further includes a protective sleeve 80, the protective sleeve 80 is cylindrical, the inner side wall of the fifth through hole 31 is further concavely provided with a third annular groove 34 communicated with the second annular groove 33, the third annular groove 34 and the first annular groove 32 are respectively arranged on two opposite sides of the second annular groove 33, the inner diameter of the second annular groove 33 is larger than the inner diameter of the third annular groove 34, the protective sleeve 80 is installed in the third annular groove 34 and abuts against the wear-resistant block 60, the inner diameter of the protective sleeve 80 is larger than the inner diameter of the wear-resistant block 60, and when the wear-resistant block 60 is excessively worn, the protective sleeve 80 can well play a role in protecting the movable mold 30 and the main sprue 10.

The movable mold 30 in this embodiment includes a third mold plate 35 connected to the fixed mold 20 and a fourth mold plate 36 disposed on a side of the third mold plate 35 away from the fixed mold 20, the fifth through hole 31 sequentially penetrates through the third mold plate 35 and the fourth mold plate 36, the first annular groove 32, the second annular groove 33 and the third annular groove 34 are all disposed on the fourth mold plate 36, and when the mold is opened, the wear-resistant block 60, the flange 70 and the protective sleeve 80 will move together with the movable mold 30.

The mould with main sprue extension structure still includes a plurality of heating member 90, and the lateral wall of main sprue 10 still is equipped with holding tank 15 that a plurality of interval set up, and heating member 90 installs in holding tank 15, and heating member 90 quantity in this embodiment is the heating rod of two symmetry settings, and main sprue 10 is heated so that it generates heat more evenly by two heating member 90.

The mold in this embodiment has the following advantages:

1. the problems of drawing and casting of the rubber mouth of the product are solved;

2. the problems that the rubber mouth of the conventional touch nozzle is damaged and a material handle appears are solved;

3. the main squirt nozzle 10 is prevented from deforming, loosening and leaking glue, and is convenient to disassemble and assemble;

4. the heat is generated evenly.

To sum up, the utility model designs an elongated main sprue bushing 10 by canceling the runner of the butt-collision nozzle in the traditional stack mold, the elongated main sprue bushing 10 is directly embedded on the fixed mold 20, the sprue bushing 11 is directly communicated with the hot runner 211, and the thickness of the original mold plate with the runner of the butt-collision nozzle can be reduced, so that the whole thickness of the mold can be correspondingly reduced, the cost of the mold is reduced, and the required injection pressure is also reduced;

moreover, because the lengthened main sprue bushing 10 is embedded on the fixed die 20, the sprue bushing runner is cancelled, and the sprue bushing runner 11 is directly communicated with the hot runner 211, the problems that the conventional sprue bushing template is thick and a glue opening is easy to damage are solved, no material handle is produced in the die, and the installation is convenient.

The lengthened main sprue bushing 10 structure system is introduced, the mold stacking and arranging structure is suitable for an open system mold stacking of a mold stacking and arranging product, the problems of wire drawing and flow casting of a conventional mold stacking rubber port and damage to a rubber port of a touch bushing are solved, the whole structure of the main sprue bushing 10 is simple to disassemble and assemble, the temperature is uniform, and the cost is saved.

The above only is the preferred embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structure changes made by the contents of the specification and the drawings under the inventive concept of the present invention, or the direct/indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims (10)

1. The utility model provides a mould with main purt extension structure, includes main purt, cover half and with cover half matched with movable mould, its characterized in that: the fixed mold is internally provided with a hot runner, the main sprue is provided with a sprue channel running through the fixed mold in the axial direction, one end of the main sprue is embedded into the fixed mold, the sprue channel is directly connected to the hot runner, the other end of the main sprue runs through the movable mold to be used for abutting against the gun nozzle, and the movable mold is in sliding connection with the main sprue.

2. The mold of claim 1, wherein the main squirt nozzle comprises a main squirt nozzle head, a main squirt nozzle body, and a plurality of spacing members, one end of the main squirt nozzle body is embedded in the fixed mold, the other end of the main squirt nozzle body passes through the movable mold, and the main squirt nozzle head is slidably embedded in one side of the main squirt nozzle body away from the fixed mold through the spacing members.

3. The die with the main squirt nozzle lengthening structure of claim 2, wherein the distance from the end of the main squirt nozzle head away from the movable die to the movable die is greater than the stroke of the movable die.

4. A mold according to claim 2, wherein the sprue body has a first axial flow channel extending therethrough, the sprue body has a second axial flow channel, one end of the second flow channel communicates with the first axial flow channel and the other end communicates with the hot runner, and the first and second flow channels form the sprue channel.

5. The mold according to claim 4, wherein the sprue bushing comprises a bushing body having a first channel therein and a ring-shaped protrusion protruding from a middle portion of an outer side of the bushing body, the positioning member comprises a screw portion and a screw head connected to an end of the screw portion, the ring-shaped protrusion has a plurality of first through holes at intervals, a slot communicating with the second channel and a plurality of first mounting holes surrounding the slot are disposed on a side of the sprue bushing body away from the fixed mold, the bushing body is inserted into the slot, the screw portion is fixed in the first mounting holes after passing through the first through holes, and a space is disposed between the screw head and the ring-shaped protrusion.

6. A die having a main squirt nozzle extension as claimed in claim 1, the die with the main squirt nozzle lengthening structure also comprises a plurality of fasteners and a central positioning block with a plurality of second through holes, the fixed die comprises a first die plate and a second die plate arranged between the first die plate and the movable die, the first die plate is internally provided with the hot runner, an insertion hole communicated with the hot runner for inserting the main sprue and a plurality of third through holes arranged at intervals with the hot runner, the second template is provided with a fourth through hole, one side of the main squirt nozzle facing the central positioning block is provided with a plurality of second mounting holes, the central positioning block is embedded in one side of the first template far away from the second template, the main squirt nozzle passes through the fourth through hole and then is positioned in the insertion hole, the fastener passes through the second through hole and the third through hole and then is fixed in the second mounting hole.

7. The mold of claim 6, wherein the central positioning block comprises a positioning plate and a positioning post protruding from a middle portion of the positioning plate, a side of the first mold plate away from the second mold plate is recessed with a mounting groove and a locking groove, the mounting groove has a groove bottom, the locking groove is recessed on the groove bottom, the positioning plate is mounted in the mounting groove, and the positioning post is mounted in the locking groove.

8. The mold with the lengthening structure of the main squirt nozzle of claim 6, wherein the mold with the lengthening structure of the main squirt nozzle further comprises a wear-resistant block and a flange, the wear-resistant block is annular, the movable mold has a fifth through hole for the main squirt nozzle to penetrate through, the inner side wall of the fifth through hole is provided with a first annular groove and a second annular groove communicated with the first annular groove in a concave manner from the end part of the movable mold to one side of the fixed mold, the diameter of the first annular groove is larger than that of the second annular groove, the wear-resistant block is sleeved outside the main squirt nozzle and is installed in the second annular groove, the flange is installed in the first annular groove and abuts against the wear-resistant block, and the inner diameter of the flange is larger than the inner diameter of the wear-resistant block.

9. The mold of claim 8, wherein the mold further comprises a protective sleeve, the protective sleeve is cylindrical, the inner sidewall of the fifth through hole is further recessed with a third annular groove communicated with the second annular groove, the third annular groove and the first annular groove are respectively disposed on two opposite sides of the second annular groove, the inner diameter of the second annular groove is greater than the inner diameter of the third annular groove, the protective sleeve is mounted in the third annular groove and abuts against the wear-resistant block, and the inner diameter of the protective sleeve is greater than the inner diameter of the wear-resistant block.

10. The mold of claim 1, further comprising a plurality of heating elements, wherein the outer sidewall of the main squirt nozzle is further provided with a plurality of receiving slots disposed at intervals, and the heating elements are mounted in the receiving slots.

Images