CN111745909A

CN111745909A - Rotatory injection mold of electronic screw core

Info

Publication number: CN111745909A
Application number: CN202010642949.7A
Authority: CN
Inventors: 韦健娇
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-07-06
Filing date: 2020-07-06
Publication date: 2020-10-09

Abstract

The invention discloses an injection mold with an electric threaded core rotating, which belongs to the technical field of injection molds and comprises a base, wherein limiting plates are respectively arranged at the top and the bottom of the joint of the outer wall of a lifting rod and a lifting plate, an internal thread sleeve is arranged at the center of the outer wall of the top of the lifting plate through a bearing, the bottom of the internal thread sleeve extends to the inner cavity of a mounting groove, a core assembly is sleeved at the bottom of the inner wall of the internal thread sleeve in a threaded manner without secondary operation, the simultaneous action of mold opening and closing and core pulling is realized through the matching of two groups of hydraulic cylinders, the lifting rod, the lifting plate and the limiting plates, the injection molding and demolding efficiency is improved, condensate in the inner cavity of a spiral heat exchange tube flows back into a condensing box through a liquid conveying pipe to be cooled again, so that low-temperature condensate flows in the, the efficiency of cooling molding is accelerated.

Description

Rotatory injection mold of electronic screw core

Technical Field

The invention relates to the technical field of injection molds, in particular to an injection mold with an electric threaded mold core rotating function.

Background

Plastic products are very common in production and daily life, wherein injection molding is the most common plastic product molding method, for convenience of processing and use, threaded holes are often formed in the injection molded products, correspondingly, a core with external threads needs to be arranged on a mold, after the products are injection molded, the core with the external threads needs to be separated from the products, generally, people adopt the following two methods to separate the core from the products, one is to insert the core with the external threads on the mold and eject the core from a driven mold together with the products, then a manual tool such as a wrench or a corresponding mechanical rotating core is used to unscrew the core from the products, the other is to arrange a corresponding rotary core pulling structure on the mold, after the products are molded, the core is rotated by the rotary core pulling structure so as to separate the core from the products, then, an ejection mechanism is started to eject a product, but the two methods both need to add a secondary processing procedure, the working strength of operators is high, the production efficiency is low, a core forming part is generally positioned in an inner cavity of a workpiece, the cooling efficiency is low, screw hole lines are easy to damage when the core is taken out, and therefore the electric injection mold with the threaded core rotating is provided.

Disclosure of Invention

The present invention is directed to an injection mold with an electric screw core rotation to solve the above problems.

In order to achieve the purpose, the invention provides the following technical scheme: an injection mold with an electric threaded core rotation comprises a base, wherein hydraulic cylinders are arranged on the left side and the right side of the outer wall of the top of the base, lifting rods are arranged at the tops of the hydraulic cylinders, two groups of lifting rod outer walls are movably sleeved with lifting plates, an upper mold and a lower mold are respectively arranged at the centers of the outer walls of the lifting plates and the side opposite to the base, a fixing plate is welded on the left side of the outer wall of the top of the lifting plate, a mounting hole which is communicated with the left side and the right side is formed in the top of the outer wall of the left side of the fixing plate, a rotating rod is mounted in the mounting hole through a bearing, transmission gears are mounted at the left end and the right end of the rotating rod, a rack is mounted at the left end of the lifting rod, the front end face of the rack is meshed with, the gear is installed at internal thread sleeve pipe top, gear top outer wall left side and right side drive gear bottom meshing, it is equipped with the mounting groove to go up mould top outer wall center, internal thread sleeve pipe bottom extends to the mounting groove inner chamber, internal thread sleeve pipe hoop inner wall bottom thread bush is equipped with the core subassembly.

Further, the core subassembly includes that the thread bush is established at the external screw thread steel pipe of internal thread sleeve pipe inner chamber, external screw thread steel pipe bottom extends to the die cavity, external screw thread steel pipe hoop is the fixed cooperation cover that is equipped with in outer wall bottom, the cooperation cover is the pipe box of hollow round platform form, cooperation cover top diameter is greater than the bottom diameter, cooperation cover bottom distance from external screw thread steel pipe bottom is two to three centimetres, installation tank bottom inner wall center from top to bottom installs in proper order with external screw thread steel pipe matched with screw hole and accomodates the groove, it communicates with each other with the die cavity to accomodate the groove, accomodate the diameter of groove and be greater than the diameter of external screw thread steel pipe.

Further, the top and the bottom of external screw thread steel pipe hoop inner wall all are equipped with the internal thread, threaded sleeve is equipped with installation shell and sealed piece respectively in external screw thread steel pipe inner chamber top and bottom, the condensation box is installed at installation shell inner chamber top, installation shell right side inner wall mid-mounting has the circulating pump, two sets of transfer lines about installation shell bottom outer wall is pegged graft and is controlled two sets of the transfer line top is connected with condensation box and circulating pump bottom respectively, and is two sets of the heliciform heat exchange tube is installed to the transfer line bottom, the circulating pump top is passed through the pipeline and is connected with condensation box bottom.

Furthermore, the depth of accomodating the groove equals the cooperation cover and is located the external screw thread steel pipe length sum of cooperation cover bottom, and is two sets of distance between the limiting plate equals the depth of accomodating the groove, lifter plate top outer wall rectangle array is equipped with four groups screw, and the threaded bush of screw is equipped with fixing bolt, go up mould top outer wall and be equipped with the mounting hole with fixing bolt matched with.

Furthermore, an operating handle is arranged at the top of the installation shell and is of an inverted U shape, two extending ends at the bottom of the operating handle are welded at the top of the installation shell, and an anti-skidding sleeve is sleeved on the outer wall of the operating handle.

Furthermore, the two groups of limiting plates on the same side are movably inserted with positioning pins on the outer walls on the opposite sides, and the two groups of lifting rods are provided with height adjusting holes matched with the positioning pins at equal intervals on the outer walls on the opposite sides.

Further, a method of using an injection mold for motorized rotation of a threaded core, the method comprising the steps of:

s1: when the die assembly injection molding is carried out, the hydraulic cylinder drives the lifting rod, the lifting plate and the upper die to descend for die assembly, the lifting rod can still move downwards after the upper die and the lower die are assembled, at the moment, the rack drives the transmission gear, the rotating rod, the gear and the internal thread sleeve to rotate, the internal thread sleeve drives the external thread steel pipe to rotate and extend downwards to enter a cavity, at the moment, the limiting plate at the top is in contact with the lifting plate, and then raw materials are injected for molding;

s2: after the injection molding is finished, a hydraulic cylinder is started, a lifting rod drives a limiting plate at the bottom to move upwards firstly, the lifting rod rises to drive a rack to rise, the rack drives a transmission gear, a rotating rod, a gear and an internal thread sleeve to rotate at the moment, the internal thread sleeve drives an external thread steel pipe to rotate and upwards receive the internal thread sleeve, the external thread steel pipe and a matching sleeve both enter a receiving groove, and the limiting plate at the bottom is contacted with a lifting plate to upwards jack the lifting plate for mold opening;

s3: in the process of injection molding, the injection mold cools through a cold water source flowing circularly, the low-temperature condensate in the inner cavity of the condensing box is pumped out by the circulating pump and is collected into the inner cavity of the spiral heat exchange tube, the condensate in the inner cavity of the spiral heat exchange tube flows back into the condensing box through the liquid conveying tube to be cooled again, so that the low-temperature condensate flowing circularly in the inner cavity of the spiral heat exchange tube is fully cooled for the water in the inner cavity of the external thread steel tube, thereby cooling the periphery of the core, accelerating the cooling molding efficiency, and screwing out the sealing block to replace the water in the inner cavity of the external.

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

1. opening the mold: the lifting rod drives the limiting plate at the bottom to move upwards firstly, the lifting rod rises to drive the rack to rise, the rack drives the transmission gear, the rotating rod, the gear and the internal thread sleeve to rotate at the moment, the internal thread sleeve drives the external thread steel pipe to rotate and upwards receive the internal thread sleeve, the external thread steel pipe and the matching sleeve both enter the receiving groove, and the limiting plate at the bottom is contacted with the lifting plate to upwards jack the lifting plate for mold opening;

die assembly: the hydraulic cylinder drives the lifting rod, the lifting plate and the upper die to descend for die assembly, the lifting rod can still move downwards after the upper die and the lower die are assembled, at the moment, the rack drives the transmission gear, the rotating rod, the gear and the internal thread sleeve to rotate, the internal thread sleeve drives the external thread steel pipe to rotate and extend downwards to enter a cavity, at the moment, the limiting plate at the top is contacted with the lifting plate, and then raw materials are injected for forming;

has the advantages that: the secondary operation is not needed, the simultaneous action of opening and closing the die and core pulling is realized through the matching of the two groups of hydraulic cylinders, the lifting rod, the lifting plate and the limiting plate, and the injection molding and demolding efficiency is improved;

2. condensate in the inner cavity of the spiral heat exchange pipe flows back into the condensing box through the liquid conveying pipe to be cooled again, so that low-temperature condensate circularly flows in the inner cavity of the spiral heat exchange pipe, water in the inner cavity of the externally threaded steel pipe is fully cooled, the periphery of the core is cooled, and the cooling forming efficiency is accelerated.

Drawings

FIG. 1 is a schematic view of the present invention illustrating clamping;

FIG. 2 is a schematic view of the mold opening of the present invention;

FIG. 3 is a schematic view of a core assembly according to the present invention;

FIG. 4 is a sectional view of an externally threaded steel pipe according to the present invention.

In the figure: 1. a base; 2. a hydraulic cylinder; 3. a lifting rod; 4. a lifting plate; 5. a limiting plate; 6. a lower die; 7. an upper die; 8. fixing the bolt; 9. a fixing plate; 10. a rotating rod; 11. a transmission gear; 12. a rack; 13. an internally threaded sleeve; 14. a gear; 15. a core assembly; 16. an externally threaded steel pipe; 161. mounting a shell; 162. a condenser tank; 163. a circulation pump; 164. a sealing block; 165. a transfusion tube; 166. a spiral heat exchange tube; 167. an operating handle; 17. a fitting sleeve; 18. mounting grooves; 19. a threaded hole; 20. a receiving groove.

Detailed Description

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

The invention provides a technical scheme that: an injection mold with an electric threaded core rotating function, please refer to fig. 1, and comprises a base 1, hydraulic cylinders 2 are arranged on the left side and the right side of the outer wall of the top of the base 1, lifting rods 3 are mounted on the tops of the hydraulic cylinders 2, lifting plates 4 are movably sleeved on the outer walls of the two groups of lifting rods 3, an upper mold 7 and a lower mold 6 are respectively arranged in the centers of the outer walls of the lifting plates 4 and the base 1 on the opposite sides, and the injection mold belongs to the prior art in the field and is not described in detail;

referring to fig. 1-2, a fixing plate 9 is welded on the left side of the outer wall of the top of a lifting plate 4, a mounting hole which is through from left to right is formed in the top of the outer wall of the left side of the fixing plate 9, a rotating rod 10 is installed in the mounting hole through a bearing, transmission gears 11 are installed at both the left and right ends of the rotating rod 10, a rack 12 is installed on the front end surface of a left lifting rod 3, the front end surface of the rack 12 is meshed with the rear side of the left transmission gear 11, limiting plates 5 are respectively installed at the top and the bottom of the joint of the outer wall of the lifting rod 3 and the lifting plate 4, an internal thread sleeve 13 is installed in the center of the outer wall of the top of the lifting plate 4 through a bearing, the internal thread sleeve 13 rotates to enable a core assembly 15 at the bottom of the internal thread sleeve to, the bottom of an internal thread sleeve 13 extends to an inner cavity of a mounting groove 18, a core assembly 15 is sleeved on the bottom of the annular inner wall of the internal thread sleeve 13 in a threaded manner, a hydraulic cylinder 2 drives a lifting rod 3, a lifting plate 4 and an upper die 7 to descend for die assembly, after the upper die 7 and a lower die 6 are in die assembly, the lifting rod 3 can still move downwards, a rack 12 drives a transmission gear 11, a rotating rod 10, a gear 14 and the internal thread sleeve 13 to rotate, the internal thread sleeve 13 drives an external thread steel pipe 16 to rotate and extend downwards to enter a die cavity, a limiting plate 5 at the top is in contact with the lifting plate 4 at the moment, and then raw;

referring to fig. 3, the core assembly 15 includes an external thread steel pipe 16 threaded on the inner cavity of the internal thread bushing 13, the bottom of the external thread steel pipe 16 extends into the cavity, a matching sleeve 17 is fixedly arranged around the bottom of the outer wall of the external thread steel pipe 16, when the matching sleeve 17 descends to the bottom, the accommodating groove 20 is closed, the formed product can be effectively prevented from generating flash at the position, the matching sleeve 17 is a hollow truncated cone-shaped pipe sleeve, the diameter of the top of the matching sleeve 17 is larger than that of the bottom, the distance between the bottom of the matching sleeve 17 and the bottom of the external thread steel pipe 16 is two to three centimeters, the distance between the matching sleeve 17 and the bottom of the external thread steel pipe is the depth of a processed screw hole, a threaded hole 19 and an accommodating groove 20 matched with the external thread steel pipe 16 are sequentially arranged at the center of the inner wall at the bottom of the mounting groove 18 from top to bottom, the external thread steel pipe 16 rotates into the accommodating groove 20, so that the external thread steel pipe leaves away from the workpiece, and the screw hole is prevented from being damaged due to the fact that the workpiece is taken up;

referring to fig. 4, internal threads are respectively arranged at the top and the bottom of the annular inner wall of the externally threaded steel pipe 16, a mounting shell 161 and a sealing block 164 are respectively sleeved at the top and the bottom of the inner cavity of the externally threaded steel pipe 16 in a threaded manner, the dismounting is convenient, a condenser box 162 is mounted at the top of the inner cavity of the mounting shell 161, a circulating pump 163 is mounted at the middle part of the inner wall of the right side of the mounting shell 161, a left group of infusion tubes 165 and a right group of infusion tubes 165 are inserted into the outer wall of the bottom of the mounting shell 161, the tops of the left group of infusion tubes 165 and the right group of infusion tubes 165 are respectively connected with the bottoms of the condenser box 162 and the circulating pump 163, spiral heat exchange tubes 166 are mounted at the bottoms of the two groups of infusion tubes 165, the top of the circulating pump 163 is connected, the water in the inner cavity of the external thread steel pipe 16 is fully cooled, so that the temperature around the core is reduced, and the cooling forming efficiency is accelerated;

referring to fig. 1-3, the depth of the accommodating groove 20 is equal to the sum of the lengths of the matching sleeve 17 and the external threaded steel pipe 16 positioned at the bottom of the matching sleeve 17, the matching sleeve 17 is completely accommodated in the accommodating groove 20, when the mold is opened, the matching sleeve 17 abuts against the top of the accommodating groove 20, the distance between the two groups of limiting plates 5 is equal to the depth of the accommodating groove 20, four groups of screw holes are arranged on the outer wall of the top of the lifting plate 4 in a rectangular array mode, fixing bolts 8 are sleeved in the screw holes in a threaded manner, and mounting holes matched with the fixing bolts 8 are formed in the outer wall of the top of the upper mold 7, so that the external threaded;

referring to fig. 4, an operating handle 167 is arranged at the top of the mounting shell 161, the operating handle 167 is in an inverted U shape, two extending ends at the bottom of the operating handle 167 are welded at the top of the mounting shell 161, and an anti-slip sleeve is sleeved on the outer wall of the operating handle 167, so that an operator can operate the mounting shell 161 conveniently and detach the mounting shell 161;

the first embodiment is as follows:

referring to fig. 1, positioning pins are movably inserted into the outer walls of two groups of limiting plates 5 on the same left and right sides, and height adjusting holes matched with the positioning pins are formed in the outer walls of two groups of lifting rods 3 on the opposite sides at equal intervals up and down, so that the distance between the two groups of limiting plates 5 can be adjusted according to the installation position between an external thread steel pipe 16 and a matching sleeve 17;

example two:

referring to fig. 1, bolts are movably inserted into the outer walls of the two groups of limiting plates 5 on the same left and right sides, height adjusting holes matched with the positioning pins are formed in the outer walls of the two groups of lifting rods 3 on the opposite sides at equal intervals up and down, and the distance between the two groups of limiting plates 5 can be adjusted according to the installation position between the external thread steel pipe 16 and the matching sleeve 17;

a method of using a motorized threaded core rotation injection mold, the method comprising the steps of:

s1: when the die assembly injection molding is carried out, the hydraulic cylinder 2 drives the lifting rod 3, the lifting plate 4 and the upper die 7 to descend for die assembly, after the upper die 7 and the lower die 6 are closed, the lifting rod 3 can still move downwards, at the moment, the rack 12 drives the transmission gear 11, the rotating rod 10, the gear 14 and the internal thread sleeve 13 to rotate, the internal thread sleeve 13 drives the external thread steel pipe 16 to rotate and extend downwards to enter a cavity, at the moment, the limiting plate 5 at the top is in contact with the lifting plate 4, and then raw materials are injected for molding;

s2: after the injection molding is finished, the hydraulic cylinder 2 is started, the lifting rod 3 drives the limiting plate 5 at the bottom to move upwards, the lifting rod 3 rises to drive the rack 12 to rise, at the moment, the rack 12 drives the transmission gear 11, the rotating rod 10, the gear 14 and the internal thread sleeve 13 to rotate, the internal thread sleeve 13 drives the external thread steel pipe 16 to rotate and upwards receive the internal thread sleeve 13, the external thread steel pipe 16 and the matching sleeve 17 both enter the receiving groove 20, at the moment, the limiting plate 5 at the bottom is contacted with the lifting plate 4, and the lifting plate 4 is upwards jacked up to open the mold;

s3: in the process of injection molding, the injection mold is cooled by a cold water source flowing circularly, the low-temperature condensate in the inner cavity of the condenser box 162 is pumped out by the circulating pump 163 to be collected into the inner cavity of the spiral heat exchange tube 166, the condensate in the inner cavity of the spiral heat exchange tube 166 flows back into the condenser box 162 through the liquid conveying tube 165 to be cooled again, the low-temperature condensate flowing circularly in the inner cavity of the spiral heat exchange tube 166 is cooled sufficiently by the water in the inner cavity of the external threaded steel tube 16, the temperature around the core is cooled, the efficiency of cooling forming is accelerated, and the water in the inner cavity of the external threaded steel tube 16 is replaced.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a rotatory injection mold of electronic screw core, includes base (1), base (1) top outer wall left and right sides all is equipped with pneumatic cylinder (2), lifter (3) are installed at pneumatic cylinder (2) top, and are two sets of lifter (3) outer wall movable sleeve is equipped with lifter plate (4), lifter plate (4) are equipped with mould (7) and bed die (6), its characterized in that respectively with the center of the relative one side outer wall of base (1): the left side of the outer wall of the top of the lifting plate (4) is welded with a fixing plate (9), the top of the outer wall of the left side of the fixing plate (9) is provided with a left mounting hole and a right mounting hole which are communicated with each other, a rotating rod (10) is mounted in the mounting hole through a bearing, transmission gears (11) are mounted at the left end and the right end of the rotating rod (10), a left side is mounted on the front end face of the lifting rod (3), a rack (12) is mounted on the front end face of the rack (12) and meshed with the rear side of the left transmission gear (11), limiting plates (5) are arranged at the top and the bottom of the joint of the outer wall of the lifting rod (3) and the lifting plate (4), an internal thread sleeve (13) is mounted at the center of the outer wall of the top of the lifting plate (4) through a bearing, a gear (14) is mounted at, the bottom of the internal thread sleeve (13) extends to an inner cavity of the mounting groove (18), and the annular inner wall of the internal thread sleeve (13) is provided with a core component (15) in a threaded sleeve mode.

2. An electric screw core rotating injection mold according to claim 1, wherein: core subassembly (15) include that the screw thread cover establishes at external screw thread steel pipe (16) of internal thread sleeve pipe (13) inner chamber, external screw thread steel pipe (16) bottom extends to the die cavity, external screw thread steel pipe (16) hoop outer wall bottom is fixed and is equipped with cooperation cover (17), cooperation cover (17) are the pipe box of hollow round platform form, cooperation cover (17) top diameter is greater than the bottom diameter, the distance of cooperation cover (17) bottom apart from external screw thread steel pipe (16) bottom is two to three centimetres, mounting groove (18) bottom inner wall center from top to bottom installs in proper order with external screw thread steel pipe (16) matched with screw hole (19) and accomodates groove (20), it communicates with each other with the die cavity to accomodate groove (20), it is greater than the diameter of external screw thread steel pipe (16) to accomodate groove (20) diameter.

3. An electric screw core rotating injection mold according to claim 2, wherein: outer screw thread steel pipe (16) hoop inner wall's top and bottom all are equipped with the internal thread, outer screw thread steel pipe (16) inner chamber top and bottom are threaded sleeve respectively and are equipped with installation shell (161) and sealed piece (164), install condensing box (162) at installation shell (161) inner chamber top, installation shell (161) right side inner wall mid-mounting has circulating pump (163), two sets of transfer line (165) about installation shell (161) bottom outer wall is pegged graft, controls two sets of transfer line (165) top is connected with condensing box (162) and circulating pump (163) bottom respectively, and is two sets of heliciform heat exchange tube (166) are installed to transfer line (165) bottom, circulating pump (163) top is passed through the pipeline and is connected bottom condensing box (162).

4. An electric screw core rotating injection mold according to claim 3, wherein: the depth of accomodating groove (20) equals cooperation cover (17) and external screw thread steel pipe (16) length sum that is located cooperation cover (17) bottom, and is two sets of distance between limiting plate (5) equals the depth of accomodating groove (20), lifter plate (4) top outer wall rectangle array is equipped with four groups of screws, and the screw internal thread cover is equipped with fixing bolt (8), go up mould (7) top outer wall be equipped with fixing bolt (8) matched with mounting hole.

5. An electric screw core rotating injection mold according to claim 4, wherein: the anti-skidding mounting shell is characterized in that an operating handle (167) is arranged at the top of the mounting shell (161), the operating handle (167) is in an inverted U shape, two extending ends at the bottom of the operating handle (167) are welded at the top of the mounting shell (161), and an anti-skidding sleeve is sleeved on the outer wall of the operating handle (167).

6. An electric screw core rotating injection mold according to claim 5, wherein: the two groups of limiting plates (5) on the same side are movably inserted with positioning pins on the outer wall on the opposite side, and the two groups of lifting rods (3) on the outer wall on the opposite side are provided with height adjusting holes matched with the positioning pins at equal intervals.

7. Use of an electric screw core rotation injection mould according to any of the claims 1-6, characterised in that: the method comprises the following steps:

s1: when the die assembly injection molding is carried out, the hydraulic cylinder (2) drives the lifting rod (3), the lifting plate (4) and the upper die (7) to descend for die assembly, after the upper die (7) and the lower die (6) are closed, the lifting rod (3) can still move downwards, the rack (12) drives the transmission gear (11), the rotating rod (10), the gear (14) and the internal thread sleeve (13) to rotate, the internal thread sleeve (13) drives the external thread steel pipe (16) to rotate and extend downwards to enter a cavity, the limiting plate (5) at the top is in contact with the lifting plate (4), and then raw materials are injected for molding;

s2: after injection molding is finished, a hydraulic cylinder (2) is started, a lifting rod (3) drives a limiting plate (5) at the bottom to move upwards at first, the lifting rod (3) rises to drive a rack (12) to rise, the rack (12) drives a transmission gear (11), a rotating rod (10), a gear (14) and an internal thread sleeve (13) to rotate at the moment, the internal thread sleeve (13) drives an external thread steel pipe (16) to rotate and upwards take in the internal thread sleeve (13), the external thread steel pipe (16) and a matching sleeve (17) both enter a take-in groove (20), the limiting plate (5) at the bottom is in contact with a lifting plate (4) at the moment, and the lifting plate (4) is upwards jacked to open the mold;

s3: in the process of injection molding, the injection mold is cooled by a cold water source flowing circularly, low-temperature condensate in the inner cavity of the condensation box (162) is pumped out by the circulating pump (163) and is collected into the inner cavity of the spiral heat exchange tube (166), the condensate in the inner cavity of the spiral heat exchange tube (166) flows back into the condensation box (162) through the infusion tube (165) to be cooled again, the low-temperature condensate flowing circularly in the inner cavity of the spiral heat exchange tube (166) is cooled sufficiently by water in the inner cavity of the externally threaded steel tube (16), the temperature around the core is cooled, the efficiency of cooling forming is accelerated, and the water in the inner cavity of the externally threaded steel tube (16) is replaced by screwing out the sealing block (164.