CN112848094A

CN112848094A - Injection molding mechanism

Info

Publication number: CN112848094A
Application number: CN201911174893.0A
Authority: CN
Inventors: 徐爱晶
Original assignee: Weihai Heyi Electronic Technology Co ltd
Current assignee: Weihai Heyi Electronic Technology Co ltd
Priority date: 2019-11-26
Filing date: 2019-11-26
Publication date: 2021-05-28

Abstract

The invention relates to the technical field of injection molding machines, in particular to an injection molding mechanism. The smelting device comprises a charging barrel shell, wherein a smelting cavity is arranged in the charging barrel shell, a charging barrel feeding hole and an exhaust hole are formed in the side wall of the charging barrel shell, and a nozzle structure is arranged at one end, opposite to the feeding hole, of the charging barrel shell; a heating device is arranged on the outer side of the charging barrel shell, and a heat recovery pipeline is wound on the outer side of the heating device; the heat recovery pipeline and the exhaust port are respectively connected with a high-temperature medium inlet of a heat exchanger through a first valve and a second valve, and a first pump body is arranged at a high-temperature medium outlet of the heat exchanger; the nozzle structure comprises a nozzle body, the nozzle body comprises a nozzle base, the left side of the nozzle base is connected with a hollow connecting sleeve, and the left side of the hollow connecting sleeve is connected with a nozzle head. The invention can better realize the recovery of waste heat and the injection of the melt.

Description

Injection molding mechanism

Technical Field

The invention relates to the technical field of injection molding machines, in particular to an injection molding mechanism.

Background

An injection molding machine, also known as an injection molding machine or an injection molding machine, is a main molding device for molding thermoplastic plastics or thermosetting materials into plastic products of various shapes by using a plastic molding mold. With the acceleration of the modernized construction steps, the injection molding machine is widely applied to various departments of national economy such as buildings, packages, electrical and electronic products, agriculture, automobiles, traffic industry, light industry, petrochemical industry, mechanical industry, national defense industry and the like and various fields of people's lives, and plays an extremely important role. The injection molding machine mainly comprises a feeding mechanism, a charging barrel, a screw, a nozzle and other parts; most of the existing feeding mechanisms are single feeding hoppers, and the existing feeding mechanisms cannot better filter out the iron scraps in the plastic raw materials; the existing charging barrel has a large amount of heat loss in the production process, thereby causing the waste of energy; the existing screw needs to move integrally in the injection process, so that the energy consumption is high and the abrasion is large; the prior nozzle has the phenomenon of drooling when the injection is finished, thereby causing the pollution of melt and the waste of materials.

Disclosure of Invention

It is an object of the present invention to provide an injection molding apparatus that overcomes some or all of the disadvantages of the prior art.

The injection molding mechanism comprises a charging barrel shell, wherein a smelting cavity for arranging a screw of an injection molding machine is axially arranged in the charging barrel shell, a charging barrel feeding hole and an exhaust hole which are communicated with the smelting cavity are formed in the side wall of the charging barrel shell, a feeding device is arranged at the charging barrel feeding hole, and a nozzle structure is arranged at one end, opposite to the feeding hole, of the charging barrel shell;

a heating device is arranged on the outer side of the charging barrel shell, and a heat recovery pipeline is wound on the outer side of the heating device; the heat recovery pipeline and the exhaust port are respectively connected with a high-temperature medium inlet of a heat exchanger through a first valve and a second valve, and a first pump body is arranged at a high-temperature medium outlet of the heat exchanger; a low-temperature medium inlet of the heat exchanger is connected with a heat exchange medium storage box, and a low-temperature medium outlet of the heat exchanger is provided with a second pump body;

the nozzle structure comprises a nozzle body, the nozzle body comprises a nozzle base, the left side of the nozzle base is connected with a hollow connecting sleeve, and the left side of the hollow connecting sleeve is connected with a nozzle head; the nozzle head comprises a nozzle head mounting seat and a nozzle cover, the nozzle head mounting seat is connected with the hollow connecting sleeve, and the nozzle cover is arranged at the nozzle head mounting seat;

the middle parts of the nozzle base and the nozzle head mounting base are coaxially and respectively provided with a material injection channel and a sliding channel, and two ends of a push rod are respectively in sliding fit with the material injection channel and the sliding channel in a sealing way; a circular first excitation winding is arranged on the left end face of the nozzle base and positioned on the inner side of the hollow connecting sleeve, a circular second excitation winding is arranged on the right end face of the nozzle head mounting base and positioned on the inner side of the hollow connecting sleeve, and a circular iron plate is arranged on the outer side of the ejector rod and positioned between the first excitation winding and the second excitation winding;

a material injection cavity is formed between the nozzle head mounting seat and the nozzle cover, and a material injection flow passage for communicating the material injection channel with the material injection cavity is axially arranged in the middle of the ejector rod; the shape of the injection cavity at the position of the injection nozzle cover is a circular truncated cone shape which is gradually reduced from the right side to the left side, and the injection cavity forms an injection molding opening at the position of the left end face of the injection nozzle cover; the left end of the ejector rod is provided with an ejector block, and the outer wall of the ejector block can be in airtight fit with the inner wall of the injection cavity at the position of the injection nozzle cover; the side wall of the ejector rod positioned in the material injection cavity is provided with a material injection port communicated with the material injection flow channel, and the distance between the material injection port and the iron plate is larger than the distance between the left end surface of the sliding channel and the iron plate.

The charging barrel structure can better recover high-temperature steam discharged from the exhaust port and waste heat at the shell of the charging barrel after the charging barrel is shut down, thereby saving energy and being green and environment-friendly.

In the invention, during injection, the first excitation winding can be introduced with excitation current, so that the first excitation winding can adsorb an iron plate, and at the moment, a melt can flow from a material injection channel to a material injection cavity from a material injection port through a material injection runner, so that the melt can flow into a mold from an injection port; when the injection is completed, the second excitation winding can be connected with excitation current, so that the second excitation winding can adsorb an iron plate, and the ejection block can immediately seal the injection molding opening from the inside, thereby better preventing the problems of material waste, hidden production trouble and the like caused by the outflow of a melt in the injection cavity.

Preferably, the right side of the nozzle base is provided with a first mounting platform protruding outwards, and the outer wall of the first mounting platform is provided with external threads. Thereby enabling the nozzle holder to be preferably mounted at the injection molding machine barrel.

Preferably, the left side of the nozzle base is provided with a second mounting platform protruding outwards, the right side of the nozzle head mounting base is provided with a third mounting platform protruding outwards, and two ends of the hollow connecting sleeve are respectively provided with a first thread mounting groove used for being in thread fit with the second mounting platform and the third mounting platform respectively. Thereby having simple structure and convenient assembly.

Preferably, a fourth mounting platform protruding outwards is arranged on the left side of the nozzle head mounting seat, and a second thread mounting groove used for being in thread fit with the fourth mounting platform is formed in the nozzle cover. Thereby having simple structure and convenient assembly.

Preferably, the pump outlet of the first pump body is communicated with the heat exchange medium storage tank. Thereby the cooled medium can be preferably recycled.

Preferably, the first valve and the second valve are both solenoid valves. Thereby enabling the first valve and the second valve to be preferably controlled.

Drawings

FIG. 1 is a schematic view of the structure of the tip end of a screw body in example 1;

FIG. 2 is a schematic view of the structure of the trailing end of the screw body in embodiment 1;

FIG. 3 is a schematic view of a nozzle body in embodiment 2;

FIG. 4 is a schematic view of the charging device body in example 3;

FIG. 5 is a schematic cross-sectional view of the charging device body in example 3;

fig. 6 is a schematic view of a cartridge structure in embodiment 4.

In the present invention, all the directional terms such as "upper", "lower", "left", "right", etc. are based on the viewing angles in the corresponding drawings, and such descriptions are only for describing the technical solution of the present invention more clearly and concisely, and do not limit the technical solution of the present invention in any way.

Detailed Description

For a further understanding of the invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings and examples. It is to be understood that the examples are illustrative of the invention and not limiting.

Example 1

The present embodiment provides an injection molding machine screw that can be preferably used in a variety of existing injection molding machines.

Referring to fig. 1, the screw of the injection molding machine of the present embodiment includes a screw body 100, the screw body 100 includes a screw main body 110, a screw ridge 111 is disposed on an outer side of the screw main body 110, and a hydraulic passage 112 is axially penetratingly disposed inside the screw main body 110; the left end of the screw body 110 is provided with a screw head 120, and the screw head 120 comprises a mounting seat 121, a screw head seat 122, a screw head body 123 and a non-return ring 124; the mounting seat 121 is fixedly arranged at the end face of the screw rod main body 110, a mounting channel 121a is arranged in the middle of the mounting seat 121 and is coaxial with the hydraulic channel 112, and the mounting channel 121a is expanded towards the outer periphery near the screw rod head main body 123 to form a spring cavity 121 b; the screw head seat 122 comprises a screw head seat connecting seat 122a, a screw head seat connecting rod 122b is arranged on the right side of the screw head seat connecting seat 122a, and the screw head seat connecting rod 122b extends into the hydraulic channel 112 through the installation channel 121 a; a piston 122c is arranged at the right end of the screw head seat connecting rod 122b, and a first compression spring 122d is arranged between the piston 122c and the left end face of the spring cavity 121 b; the screw head body 123 comprises a screw head body head 123a which is in a conical shape, a screw head body connecting part 123b which is in a cylindrical shape is arranged on the right side of the screw head body head 123a, and the right end of the screw head body connecting part 123b is connected with the left side of the screw head seat connecting seat 122 a; the non-return ring 124 is connected with the right end face of the head 123a of the screw head main body through a connecting screw rod 124a, the connecting screw rod 124a is fixedly connected with the head 123a of the screw head main body, the connecting screw rod 124a is in sliding fit with the non-return ring 124, and a second compression spring 124b is sleeved between the non-return ring 124 and the head 123a of the screw head main body through the connecting screw rod 124 a; a material channel 131 is formed between the inner hole of the check ring 124 and the connecting portion 123b of the screw head body, and a sealing surface 132 is formed between the right end surface of the check ring 124 and the left end surface of the screw head seat connecting seat 122 a.

In this embodiment, during plasticization, the screw head seat connecting seat 122a is tightly attached to the left end surface of the mounting seat 121 under the action of the first compression spring 122d, and the molten plastic can push the check ring 124 to the left side, so that the melt can flow to the screw head main body 123 side through the material channel 131, where it should be understood that the elastic force provided by the second compression spring 124b should be lower than the elastic force provided by the first compression spring 122 d; during injection, hydraulic oil can be introduced into the hydraulic passage 112 to push the piston 122c to move leftward against the first compression spring 122d, and at this time, the check ring 124 presses the screw head seat connecting seat 122a under the action of the second compression spring 124b, so as to preferably prevent the melt at the side of the screw head main body 123 from flowing backwards.

Through the structure, the screw body 110 does not need to move axially during injection, so that the abrasion of the screw rib 111 can be reduced better, excessive external force is not needed during injection, and the injection molding cost can be reduced better.

In addition, in the present embodiment, the screw head seat connecting rod 122b is connected to the piston 122c through a screw thread, and the screw head body connecting portion 123b is also connected to the screw head seat connecting seat 122a through a screw thread. This enables the present embodiment to first insert the screw head seat connecting rod 122b into the mounting channel 121a, then load the first compression spring 122d and the piston 122c in sequence, and then load the mounting seat 121 at the end face of the screw body 110 when assembling; secondly, the check ring 124 is rotated to the screw head main body 123, and then the screw head main body connecting part 123b is connected with the screw head seat connecting seat 122a, so that the assembly can be completed; thereby facilitating assembly.

In this embodiment, the mounting seat 121 is connected to the screw head body 123 by the socket head cap screw 121c, so that the mounting seat 121 is preferably connected to the screw body 110.

In this embodiment, the screw head seat connecting rod 122b is hermetically matched with the mounting channel 121 a. So that the melt can be preferably prevented from flowing into the interior of the screw body 110.

In this embodiment, the sealing surface 132 includes a sealing inclined surface formed at an edge of an end surface of the screw head seat connecting seat 122a, the check ring 124 is formed with a sealing groove into which the screw head seat connecting seat 122a extends, and the sealing groove is configured with a first sealing surface for hermetically fitting with the end surface of the screw head seat connecting seat 122a, a second sealing surface for fitting with the sealing inclined surface, and a third sealing surface for fitting with a side surface of the screw head seat connecting seat 122 a. So that a better seal can be formed between the right end surface of the check ring 124 and the left end surface of the screw head seat connecting seat 122 a.

As a modification of this embodiment, a sliding groove can be further provided at the left end surface of the mounting seat 121, and the screw head seat connecting seat 122a can be slidably fitted in a sealing manner with the sliding groove. Thereby enabling to further prevent the melt from flowing into the interior of the screw body 110.

In this embodiment, a material flow passage 123c is axially formed outside the screw head body 123. Thereby facilitating the flow of the melt.

As shown in fig. 2, the rear end of the screw body 110 is provided with a transmission part 210, the side wall of the transmission part 210 is provided with a key groove 211, and the key groove 211 can be circumferentially and fixedly matched with the transmission gear, so as to preferably facilitate the transmission of external power into the screw body 110 through gear transmission; in addition, the right side of the transmission part 210 is provided with a rotating part 220, the rotating part 220 is matched with the side wall of a hydraulic oil tank 230 through a bearing 241, the rotating part 220 extends into the hydraulic oil tank 230, two sides of the bearing 241 are respectively provided with a first oil seal 242 and a second oil seal 243, and the hydraulic oil tank 230 is provided with a hydraulic oil inlet 231. With this structure, hydraulic oil can flow into the hydraulic passage 112 through the hydraulic oil tank 230 to push the piston 122c, so that the hydraulic oil can be prevented from being disturbed by the rotation of the screw body 110.

Example 2

The present embodiment provides a nozzle structure for an injection molding machine that can be preferably used in a variety of existing injection molding machines.

As shown in fig. 3, a nozzle structure for an injection molding machine of the present embodiment includes a nozzle body 300.

The nozzle body 300 comprises a nozzle base 310, the left side of the nozzle base 310 is connected with a hollow connecting sleeve 320, and the left side of the hollow connecting sleeve 320 is connected with a nozzle head 330; the nozzle head 330 comprises a nozzle head mounting base 331 and a nozzle cover 332, the nozzle head mounting base 331 is connected with the hollow connecting sleeve 320, and the nozzle cover 332 is arranged at the nozzle head mounting base 331;

the middle parts of the nozzle base 310 and the nozzle head mounting base 331 are coaxially and respectively provided with a material injection channel 311 and a sliding channel 331a, and two ends of a push rod 340 are respectively in sliding fit with the material injection channel 311 and the sliding channel 331a in a sealing way; an annular first excitation winding 312 is arranged on the left end face of the nozzle base 310 and positioned on the inner side of the hollow connecting sleeve 320, an annular second excitation winding 331b is arranged on the right end face of the nozzle head mounting base 331 and positioned on the inner side of the hollow connecting sleeve 320, and an annular iron plate 341 is arranged on the outer side of the push rod 340 and positioned between the first excitation winding 312 and the second excitation winding 331 b;

a material injection cavity 333 is formed between the nozzle head mounting seat 331 and the nozzle cover 332, and a material injection flow channel 342 for communicating the material injection channel 311 and the material injection cavity 333 is axially arranged in the middle of the push rod 340; the shape of the injection cavity 333 at the nozzle cover 332 is configured into a truncated cone shape gradually reducing from right to left, and the injection cavity 333 forms an injection port 333a at the left end face of the nozzle cover 332; the left end of the push rod 340 is provided with a push block 343, and the outer wall of the push block 343 can be in close fit with the inner wall of the material injection cavity 333 at the nozzle cover 332; the side wall of the top rod 340 positioned in the material injecting cavity 333 is provided with a material injecting port 344 communicated with the material injecting flow channel 342, and the distance between the material injecting port 344 and the iron plate 341 is larger than the distance between the left end surface of the sliding channel 331a and the iron plate 341.

In the nozzle structure of the embodiment, during injection, the first excitation winding 312 can be supplied with excitation current, so that the first excitation winding 312 can adsorb the iron plate 341, and at this time, the melt can flow from the injection channel 311 to the injection cavity 333 from the injection port 344 via the injection runner 342, so that the melt can flow into the mold from the injection port 333 a; when injection is completed, the second excitation winding 331b can be supplied with excitation current, so that the second excitation winding 331b can adsorb the iron plate 341, and at the moment, the ejector block 343 can immediately seal the injection molding port 333a from the inside, thereby better preventing the problems of material waste, hidden production trouble and the like caused by outflow of a melt in the injection molding cavity 333.

In this embodiment, the right side of the nozzle holder 310 is provided with a first mounting platform 313 protruding outwards, and the outer wall of the first mounting platform 313 is provided with an external thread. Thereby enabling the nozzle holder 310 to be preferably mounted at the injection molding machine barrel.

In this embodiment, the left side of the nozzle holder 310 is provided with a second mounting platform 314 protruding outwards, the right side of the nozzle head mounting base 331 is provided with a third mounting platform 331c protruding outwards, and both ends of the hollow connecting sleeve 320 are provided with first thread mounting grooves for respectively being in thread fit with the second mounting platform 314 and the third mounting platform 331 c. Thereby having simple structure and convenient assembly.

In this embodiment, a fourth mounting platform 331d protruding outward is disposed on the left side of the nozzle head mounting base 331, and a second thread mounting groove for thread-fitting with the fourth mounting platform 331d is disposed at the nozzle cover 332. Thereby having simple structure and convenient assembly.

Example 3

The embodiment provides a feeding device for an injection molding machine, which can be preferably applied to various existing injection molding machines.

As shown in fig. 4, the charging device of the present embodiment includes a charging device body 400.

The feeding device body 400 comprises a feeding hopper 410, wherein an opening above the feeding hopper 410 is a feeding port, and an opening below the feeding hopper 410 is a discharging port; a plurality of sieve holes 411 are formed in the side wall of the feed hopper 410, a protective cover 420 is arranged on the outer side of the feed hopper 410, and a closed cavity is formed between the protective cover 420 and the feed hopper 410; the inner side of the shield 420 is provided with a third excitation winding 430, the inner side of the third excitation winding 430 is provided with a plastic layer 440, an independent dust collecting cavity 450 is formed between the plastic layer 440 and the outer wall of the shield 420, and the bottom of the dust collecting cavity 450 is provided with an ash outlet 451.

In this embodiment, the plastic material can enter the feeding hopper 410 from the feeding port, and when the third excitation winding 430 is energized with the excitation current, the iron shavings doped in the plastic material can be absorbed into the dust collecting cavity 450 through the sieve holes 411, so that the iron shavings doped in the plastic material can be preferably removed; it should be understood here that the aperture of mesh 411 should be such that the plastic material does not pass through mesh 411. In addition, when the third excitation winding 430 is not energized with the excitation current, the iron cuttings in the dust collection chamber 450 can fall into the bottom of the dust collection chamber 450 and then fall out from the dust outlet 451, thereby preferably realizing the periodic cleaning function of the dust collection chamber 450.

Referring to fig. 5, a first filtering barrel 480 with an upward opening is arranged in the feeding hopper 410, the edge of the upper end surface of the first filtering barrel 480 is connected with the inner periphery of the feeding opening of the feeding hopper 410, and a blanking gap 481 is arranged between the first filtering barrel 480 and the feeding hopper 410; a second filter barrel 490 with an upward opening is rotatably arranged in the first filter barrel 480, and the edge of the upper end surface of the second filter barrel 490 is connected with the inner circumference of the upper end surface of the first filter barrel 480; first lauter tub 480 lateral wall has many first punishment in the vertical direction strip mouth 482 that goes on extending along circumference evenly distributed, and second lauter tub 490 lateral wall has many second punishment in the vertical direction strip mouth 491 that goes on extending along circumference evenly distributed, and the quantity of first punishment in the material strip mouth 482 is the same with the quantity of second punishment in the material strip mouth 491, and through rotating second lauter tub 490, first punishment in the material strip mouth 482 can be closed completely or open completely. Through the structure, the plastic raw material can firstly enter the interior of the second filter barrel 490 and then flows into the blanking gap 481 through the second material passing strip-shaped opening 491 and the first material passing strip-shaped opening 482, so that all the plastic raw material flows to the discharging opening along the inner wall of the feed hopper 410, and the third excitation winding 430 can better clean iron scraps in the plastic raw material. In addition, by adjusting the relative positions of the first material passing strip-shaped opening 482 and the second material passing strip-shaped opening 491, the particle diameters of the plastic raw materials entering the blanking gap 481 can be preferably screened, so that the uniformity of the plastic raw materials can be preferably ensured. Also, the first strip 482 can be completely closed when injection molding is to be completed, so that accumulation of plastic raw material in the feed hopper 410 can be preferably prevented.

In this embodiment, the upper portion of the feeding hopper 410 is formed in a hollow cylindrical shape, and the lower portion of the feeding hopper 410 is formed in a hollow circular truncated cone shape with an inner diameter gradually decreasing from top to bottom. Thereby facilitating blanking.

In this embodiment, a discharge pipe 460 is connected to a discharge port of the feeding hopper 410, and a feeding screw 461 is disposed inside the discharge pipe 460. Thereby facilitating blanking.

In this embodiment, a sealing cover 470 is detachably disposed at the feeding port of the feeding hopper 410, and a feeding pipe 471 is disposed at the upper portion of the sealing cover 470. So that the inside of the feed hopper 410 can be preferably shielded.

Example 4

The present embodiment provides a cartridge structure for an injection molding machine that can be preferably utilized in a variety of existing injection molding machines.

As shown in connection with fig. 6, the cartridge structure of the present embodiment includes a cartridge housing 610.

A smelting cavity 611 for arranging a screw of the injection molding machine is axially arranged in the cylinder shell 610, a cylinder feed inlet 612 and an exhaust port 613 which are communicated with the smelting cavity 611 are arranged on the side wall of the cylinder shell 610, a feeding device is arranged at the cylinder feed inlet 612, and a nozzle structure is arranged at one end of the cylinder shell 610, which is opposite to the feed inlet 612;

a heating device 620 is arranged on the outer side of the charging barrel shell 610, and a heat recovery pipeline 630 is wound on the outer side of the heating device 620; the heat recovery pipe 630 and the exhaust port 613 are respectively connected to a high temperature medium inlet of a heat exchanger 650 through a first valve 641 and a second valve 642, and a first pump 660 is disposed at a high temperature medium outlet of the heat exchanger 650; the low-temperature medium inlet of the heat exchanger 650 is connected to a heat exchange medium storage tank 670, and the low-temperature medium outlet of the heat exchanger 650 is provided with a second pump body 680.

The cartridge structure of the embodiment can preferably recover the high-temperature steam exhausted from the exhaust port 613 and the waste heat at the cartridge housing 610 after shutdown, thereby saving energy and protecting the environment.

In this embodiment, the pump outlet of the first pump body 660 communicates with the heat exchange medium reservoir 670. Thereby the cooled medium can be preferably recycled.

In this embodiment, the first valve 641 and the second valve 642 are both solenoid valves. So that the first and

second valves

641 and 642 can be preferably controlled.

Example 5

The present embodiment provides an injection molding machine including any one or more of the configurations of embodiments 1-4.

The present invention and its embodiments have been described above schematically, without limitation, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching, without departing from the spirit of the invention, the person skilled in the art shall not inventively design the similar structural modes and embodiments to the technical solution, but shall fall within the scope of the invention.

Claims

1. An injection molding mechanism, which is characterized in that: the injection molding machine comprises a charging barrel shell (610), wherein a smelting cavity (611) for arranging a screw of an injection molding machine is axially arranged in the charging barrel shell (610), a charging barrel feeding hole (612) and an exhaust port (613) which are communicated with the smelting cavity (611) are arranged at the side wall of the charging barrel shell (610), a feeding device is arranged at the charging barrel feeding hole (612), and a nozzle structure is arranged at one end, opposite to the feeding hole (612), of the charging barrel shell (610);

a heating device (620) is arranged on the outer side of the charging barrel shell (610), and a heat recovery pipeline (630) is wound on the outer side of the heating device (620); the heat recovery pipeline (630) and the exhaust port (613) are respectively connected with a high-temperature medium inlet of a heat exchanger (650) through a first valve (641) and a second valve (642), and a first pump body (660) is arranged at a high-temperature medium outlet of the heat exchanger (650); a low-temperature medium inlet of the heat exchanger (650) is connected with a heat exchange medium storage box (670), and a low-temperature medium outlet of the heat exchanger (650) is provided with a second pump body (680);

the nozzle structure comprises a nozzle body (300), the nozzle body (300) comprises a nozzle base (310), the left side of the nozzle base (310) is connected with a hollow connecting sleeve (320), and the left side of the hollow connecting sleeve (320) is connected with a nozzle head (330); the nozzle head (330) comprises a nozzle head mounting seat (331) and a nozzle cover (332), the nozzle head mounting seat (331) is connected with the hollow connecting sleeve (320), and the nozzle cover (332) is arranged at the nozzle head mounting seat (331);

the middle parts of the nozzle base (310) and the nozzle head mounting base (331) are coaxially and respectively provided with a material injection channel (311) and a sliding channel (331a), and two ends of a push rod (340) are respectively in sliding fit with the material injection channel (311) and the sliding channel (331a) in a sealing way; an annular first excitation winding (312) is arranged at the position, located on the inner side of the hollow connecting sleeve (320), of the left end face of the nozzle base (310), an annular second excitation winding (331b) is arranged at the position, located on the inner side of the hollow connecting sleeve (320), of the right end face of the nozzle head mounting base (331), and an annular iron plate (341) is arranged between the first excitation winding (312) and the second excitation winding (331b) on the outer side of the ejector rod (340);

a material injection cavity (333) is formed between the nozzle head mounting seat (331) and the nozzle cover (332), and a material injection flow channel (342) for communicating the material injection channel (311) and the material injection cavity (333) is axially arranged in the middle of the push rod (340); the shape of the material injection cavity (333) at the nozzle cover (332) is configured into a circular truncated cone shape which is gradually reduced from right to left, and an injection port (333a) is formed at the left end surface of the nozzle cover (332) by the material injection cavity (333); the left end of the ejector rod (340) is provided with an ejector block (343), and the outer wall of the ejector block (343) can be in close fit with the inner wall of the material injection cavity (333) at the nozzle cover (332); a material injection port (344) communicated with the material injection flow channel (342) is formed in the position, located on the side wall of the material injection cavity (333), of the top rod (340), and the distance between the material injection port (344) and the iron plate (341) is larger than the distance between the left end face of the sliding channel (331a) and the iron plate (341);

the injection molding machine screw in the smelting cavity (611) comprises a screw body (100), the screw body (100) comprises a screw main body (110), a screw ridge (111) is arranged on the outer side of the screw main body (110), and a hydraulic channel (112) is arranged in the screw main body (110) in a penetrating manner along the axial direction; the left end of the screw body (110) is provided with a screw head (120), and the screw head (120) comprises a mounting seat (121), a screw head seat (122), a screw head body (123) and a non-return ring (124); the mounting seat (121) is fixedly arranged at the end face of the screw rod main body (110), the middle part of the mounting seat (121) and the hydraulic channel (112) are coaxially provided with a mounting channel (121a), and the part, close to the screw rod head main body (123), of the mounting channel (121a) expands towards the outer periphery to form a spring cavity (121 b); the screw head seat (122) comprises a screw head seat connecting seat (122a), a screw head seat connecting rod (122b) is arranged on the right side of the screw head seat connecting seat (122a), and the screw head seat connecting rod (122b) extends into the hydraulic channel (112) through the mounting channel (121 a); a piston (122c) is arranged at the right end of the screw head seat connecting rod (122b), and a first compression spring (122d) is arranged between the piston (122c) and the left end face of the spring cavity (121 b); the screw head body (123) comprises a conical screw head body head (123a), a cylindrical screw head body connecting part (123b) is arranged on the right side of the screw head body head (123a), and the right end of the screw head body connecting part (123b) is connected with the left side of the screw head seat connecting seat (122 a); the non-return ring (124) is connected with the right end face of the head part (123a) of the screw head main body through a connecting screw rod (124a), the connecting screw rod (124a) is fixedly connected with the head part (123a) of the screw head main body, the connecting screw rod (124a) is in sliding fit with the non-return ring (124), and a second compression spring (124b) is sleeved between the non-return ring (124) and the head part (123a) of the screw head main body; a material channel (131) is formed between the inner hole of the check ring (124) and the connecting part (123b) of the screw head main body, and a sealing surface (132) is formed between the right end surface of the check ring (124) and the left end surface of the screw head seat connecting seat (122 a).

2. The injection mechanism of claim 1, further comprising: the pump outlet of the first pump body (660) is communicated with a heat exchange medium storage tank (670).