CN214188299U

CN214188299U - Injection molding machine for injection molding

Info

Publication number: CN214188299U
Application number: CN202022747748.1U
Authority: CN
Inventors: 包明刚; 包奇斌
Original assignee: Zhejiang Guangming Plastics Machinery Co ltd
Current assignee: Zhejiang Guangming Plastics Machinery Co ltd
Priority date: 2020-11-24
Filing date: 2020-11-24
Publication date: 2021-09-14
Anticipated expiration: 2030-11-24

Abstract

The injection molding machine comprises a conical double-machine barrel and two screws respectively penetrating through corresponding through holes in the conical double-machine barrel, wherein a discharge port of the conical double-machine barrel is communicated with a material inlet of a flat double-screw machine barrel combined structure through a sealing conveying pipe, and a rough machining material output from the discharge port of the conical double-machine barrel is subjected to secondary melting extrusion in the flat double-screw machine barrel combined structure and then leaves the injection molding machine from a material outlet of the flat double-screw machine barrel combined structure. The utility model has the advantages that: the discharge port of the conical double-screw machine barrel is connected with the material inlet of the flat double-screw machine barrel combined structure through the sealed material conveying pipe, so that the secondary processing of the material is realized, the discharge quality is improved, and the yield is high; the material entering the flat double-machine barrel is treated once, so that the flowability is high, the damage to the screw is small, and the service life of the material extruding screw in the flat double-machine barrel can be prolonged.

Description

Injection molding machine for injection molding

Technical Field

The utility model relates to an injection molding machine preparation technical field especially indicates an injection molding machine for moulding plastics.

Background

The prior Chinese utility model patent with the application number of CN201820243248.4 named as 'one injection molding machine cone double-machine cylinder' discloses a novel practical, durable, energy-saving and stable injection molding machine cone double-machine cylinder, which sequentially comprises a machine cylinder head, a feeding section, a shearing section, a mixing section and a plasticizing section which are connected with each other; the interiors of the barrel head, the feeding section, the shearing section, the mixing section and the plasticizing section have double-barrel structures which are communicated with one another. The utility model discloses a two barrels of injection molding machine awl, simple structure can be with the frictional force that the work aspect produced at the during operation will be minimum, anticorrosive and wear resistance performance preferred simultaneously, the effectual stability that increases its overall structure simultaneously, can satisfy processing and the work demand of some daily high strength, great improvement its holistic life, be particularly suitable for being used for feed back and 2 times processing material, improvement product quality. However, the discharge quality of the cylinder for material processing is still not ideal, and therefore the structure of the cylinder needs to be further improved.

Disclosure of Invention

The utility model aims to solve the technical problem that to above-mentioned prior art current situation and provide one kind can improve ejection of compact quality, and long service life's an injection molding machine for moulding plastics.

The utility model provides a technical scheme that above-mentioned technical problem adopted does: this injection molding machine for moulding plastics, wear the screw rod of putting in the corresponding through-hole in two barrels of awl respectively including two barrels of awl and two be provided with the feed inlet on the one end lateral wall of two barrels of awl the other end of two barrels of awl is provided with the discharge gate, feed inlet and discharge gate are linked together with the through-hole, the screw rod is including being the conical body of rod and the spiral shell arris of setting on the body of rod, and the spiral shell arris of any screw rod stretches into in the spiral shell arris clearance to another screw rod, and the spiral shell arris that stretch into leaves the processing clearance of extrusion material with corresponding between another screw rod surface, two barrels of awl include that barrel is one section, barrel two sections and barrel three-section, the feed inlet is located barrel one section, the discharge gate is located the barrel three-section, its characterized in that: the discharge port is communicated with a material inlet of the flat double-screw machine barrel combined structure through a sealed conveying pipe, and a rough machining material output from the discharge port of the conical double-screw machine barrel is subjected to secondary melt extrusion in the flat double-screw machine barrel combined structure and then leaves the injection molding machine from a material outlet of the flat double-screw machine barrel combined structure.

The combined structure of the flat double-screw machine barrel comprises the flat double-screw machine barrel and two cylindrical screws respectively penetrating through corresponding through holes of the flat double-screw machine barrel, a material inlet is formed in the side wall of one end of the flat double-screw machine barrel, a material outlet is formed in the other end of the flat double-screw machine barrel, the material inlet and the material outlet are communicated with the through holes, each cylindrical screw comprises a cylindrical rod body and extruding screw ridges arranged on the cylindrical rod body, the extruding screw ridges of any cylindrical screw extend into the extruding screw ridge gaps of the other cylindrical screw, and a processing gap for extruding materials is reserved between the extending extruding screw ridges and the outer surface of the corresponding other cylindrical screw.

As an improvement, the flat double-machine barrel comprises a first flat double-machine barrel section and a second flat double-machine barrel section, the first flat double-machine barrel section and the second flat double-machine barrel section are connected together through a flange, a hollow heat sleeve capable of heating the flat double-machine barrel is sleeved on the outer wall of one section of the flat double-machine barrel between the flange and the material inlet, a hot gas inlet is arranged at the top of the hollow thermal sleeve, a condensate outlet is arranged at the bottom of the hollow thermal sleeve, a temperature adjusting pipe capable of adjusting the temperature of the flat double-machine cylinder is wound on the two-section outer wall of the flat double-machine cylinder close to the material outlet, the extruding screw rib comprises an extruding feeding section, an extruding melting section and an extruding discharging section, the extruding discharging section comprises an extruding discharging section and an extruding discharging section, the screw rib width of the extruding discharging section is smaller than that of the extruding discharging section, and the left end of the extruding discharging section and the extruding discharging section correspond to the flat double cylinders where the temperature adjusting pipes are located.

The temperature adjusting pipe is in a spiral shape, and a spiral adjusting pipe connecting groove is formed in the outer wall of the flat double-machine barrel corresponding to the temperature adjusting pipe.

The cylinder is provided with a cylinder vent hole on the outer wall of the flat double-cylinder close to the connecting groove of the adjusting pipe, and the cylinder vent hole is a through hole vertically arranged.

In a further improvement, a machine barrel positioning concave part is arranged on the outer wall of the bottom of the flat double machine barrel between the end part of the adjusting pipe connecting groove and the machine barrel exhaust hole, and machine barrel threaded holes are distributed on the bottom surface of the machine barrel positioning concave part.

The cylinder positioning screw holes are distributed on the top of the flat double-cylinder along the axial direction, the cylinder positioning screw holes between the connecting groove of the adjusting pipe and the material inlet are distributed at equal intervals, and the distance between the cylinder positioning screw holes on the connecting groove of the adjusting pipe is smaller than the distance between the cylinder positioning screw holes between the connecting groove of the adjusting pipe and the material inlet.

The material extruding and melting device is characterized in that the material extruding and feeding section is a double-screw rib, the material extruding and melting section comprises a material extruding and melting section, a material extruding and melting section and a material extruding and melting section, the material extruding and melting section and the material extruding and melting section are double-screw ribs, the material extruding and melting section is a single-screw rib, the material extruding and discharging section is a three-screw rib, a spiral material extruding backflow groove is arranged on the material extruding and melting section, the spiral direction of the material extruding backflow groove is opposite to the spiral direction of the material extruding and melting section, the distance between the material extruding and feeding section and the material extruding and melting section is sequentially reduced, and the distance between the screw ribs of the material extruding and discharging section is larger than the maximum distance between the screw ribs of the material extruding and feeding section.

As an improvement, the conical double-cylinder has the specific structure that an alloy layer is arranged on the inner wall of a cylinder section between a feed port and a right opening of the cylinder section, a first wear-resistant sleeve penetrating through the cylinder section is arranged on the inner wall of the cylinder section, a second wear-resistant sleeve penetrating through the cylinder section is arranged on the inner wall of the cylinder section, the left end surface of the first wear-resistant sleeve is flush with the left end surface of the cylinder section, the right end surface of the first wear-resistant sleeve is flush with the right end surface of the cylinder section, the left end surface of the second wear-resistant sleeve is flush with the left end surface of the cylinder section, the right end surface of the second wear-resistant sleeve is flush with the right end surface of the cylinder section, the right opening diameter of the alloy layer is the same as the left opening diameter of the first wear-resistant sleeve, the right opening diameter of the first wear-resistant sleeve is the same as the left opening diameter of the second wear-resistant sleeve, and a surface alloy layer is arranged on the outer surface of a screw corresponding to the alloy layer, the first wear-resistant sleeve and the second wear-resistant sleeve, the conical head of any screw rod extends out of the conical double-machine barrel by 3-5 mm.

The left end of the first barrel section is provided with a connecting flange, the outer diameter of the connecting flange is the same as the diameter of the first barrel section, connecting holes which can be sequentially matched with flange through holes of the connecting flange are distributed on the right end face of the first barrel section, the first barrel section comprises a first barrel section and a second barrel section, the diameter of the first barrel section is smaller than that of the connecting flange and larger than that of the second barrel section, a limiting groove is arranged at the joint of the first barrel section and the connecting flange, a lantern ring is arranged in the limiting groove, and the outer diameter of the lantern ring is larger than the diameter of a minimum circle formed by connecting the outer edges of the flange through holes on the connecting flange; and the outer walls of the first machine barrel section and the second machine barrel section are respectively provided with a positioning screw hole, and the bottom end of the positioning screw hole is an arc end which can be matched with the positioning screw.

The screw edges comprise a feeding section, a melting section and a discharging section, the feeding section comprises a feeding section and a feeding section, the melting section comprises a melting section, a melting section and a melting section, the discharging section comprises a discharging section, a discharging section and a discharging section, the screw edge width of the feeding section is greater than that of the feeding section, the screw edge width of the melting section is greater than that of the melting section, the feeding section, the melting section and the melting section are both double screw edges, the discharging section is a triple screw edge, the melting section is a single screw edge, the screw edge distances from the feeding section to the melting section are sequentially reduced, and the screw edge distance of the discharging section is greater than that of the feeding section; spiral backflow grooves are circumferentially distributed on the two melting sections, the radial cross sections of the backflow grooves are semicircular, the backflow grooves are divided into a backflow section and a backflow section, the left end of the backflow section is high, the right end of the backflow section is low, and the right end of the backflow section is opposite to the left end of the backflow section.

Compared with the prior art, the utility model has the advantages of: the discharge port of the conical double-screw machine barrel is connected with the material inlet of the flat double-screw machine barrel combined structure through the sealed material conveying pipe, so that the secondary processing of the material is realized, the discharge quality is improved, and the yield is high; the material entering the flat double-machine barrel is treated once, so that the flowability is high, the damage to the screw is small, and the service life of the material extruding screw in the flat double-machine barrel can be prolonged; alloy structures are arranged at the matching positions of the conical double machine barrel and the screw, specifically, an alloy layer is arranged on the inner wall of one section of the machine barrel between the feed inlet and the right end opening of one section of the machine barrel, a first wear-resistant sleeve penetrating through the second section of the machine barrel is arranged on the inner wall of the second section of the machine barrel, a second wear-resistant sleeve penetrating through the third section of the machine barrel is arranged on the inner wall of the third section of the machine barrel, and a surface alloy layer is arranged on the outer surface of the screw corresponding to the alloy layer, the first wear-resistant sleeve and the second wear-resistant sleeve, so that the combined structure has good wear resistance and corrosion resistance, can; the hot jacket can heat the material that gets into in the barrel inner chamber, can let the material get into the molten condition fast, push away to the barrel middle part by the screw rod, it is smooth and easy to make the material feeding, be provided with the temperature regulation pipe on the barrel near the discharge gate, the temperature regulation pipe corresponds with the ejection of compact section of screw rod, the temperature that the temperature regulation pipe can adjust flat duplex barrel and correspond the heating temperature of position, thereby keep in a stable ejection of compact temperature interval when making the material ejection of compact, to the processing of crowded material of essence, stable ejection of compact temperature helps exporting the finished product material that accords with the production requirement, improve ejection of compact effect.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is a schematic view of the structure of FIG. 1 with the sealing feed delivery tube and the barrel of the flat twin-screw removed;

FIG. 3 is a cross-sectional view of the conical twin-screw machine barrel of FIG. 2 taken along line A-A;

FIG. 4 is a cross-sectional view of the conical twin-screw machine barrel of FIG. 2 taken along line B-B;

FIG. 5 is an enlarged view of portion I of FIG. 2;

FIG. 6 is a front perspective view of the screw of FIG. 2;

FIG. 7 is a cross-sectional view taken along line A-A of FIG. 6;

FIG. 8 is a schematic structural view of the reflux drum of FIG. 6;

FIG. 9 is a schematic structural view of the flat twin screw barrel assembly of FIG. 1;

FIG. 10 is a cross-sectional view of the flat twin barrels of FIG. 9 taken along line A-A;

FIG. 11 is a cross-sectional view of the flat twin-screw machine of FIG. 9 taken along line B-B;

FIG. 12 is a cross-sectional view of the flat twin barrels of FIG. 9 taken along line C-C;

FIG. 13 is a front perspective view of the screw of FIG. 9;

fig. 14 is a cross-sectional view taken along line a-a of fig. 13.

Detailed Description

The present invention will be described in further detail with reference to the following embodiments.

As shown in fig. 1 to 14, the injection molding machine for injection molding of this embodiment includes a conical twin-screw barrel 1 and two screws respectively inserted into corresponding through holes in the conical twin-screw barrel 1, a feed inlet 11 is disposed on a side wall of one end of the conical twin-screw barrel 1, a discharge outlet is disposed at the other end of the conical twin-screw barrel 1, the feed inlet 11 and the discharge outlet are communicated with the through holes, the screws include a conical rod 2 and screw ridges 21 disposed on the rod 2, the screw ridge 21 of any screw extends into a screw ridge gap of another screw, a processing gap for extruding a material is left between the extending screw ridge 21 and the outer surface of the other screw, the conical twin-screw barrel 1 includes a barrel section a, a barrel section B and a barrel section C, the feed inlet 11 is disposed on the barrel section a, the discharge outlet is disposed on the barrel section C, the discharge outlet is communicated with a material inlet 71 of a flat twin-screw barrel combination structure through a sealing material conveying pipe 9, the rough-processed material output from the discharge port of the conical twin-screw cylinder 1 is subjected to second melt extrusion in the flat twin-screw cylinder combined structure and then leaves the injection molding machine from the material outlet of the flat twin-screw cylinder combined structure.

The combined structure of the flat double-screw machine barrel comprises a flat double-screw machine barrel 7 and two cylindrical screws respectively penetrating through corresponding through holes of the flat double-screw machine barrel 7, a material inlet 71 is formed in the side wall of one end of the flat double-screw machine barrel 7, a material outlet is formed in the other end of the flat double-screw machine barrel 7, the material inlet 71 and the material outlet are communicated with the through holes, each cylindrical screw comprises a cylindrical rod body 8 and an extruding screw rib 81 arranged on the cylindrical rod body 8, the extruding screw rib 81 of any cylindrical screw extends into a gap of the extruding screw rib 81 of the other cylindrical screw, and a processing gap for extruding materials is reserved between the extending extruding screw rib 81 and the outer surface of the corresponding other cylindrical screw.

The flat double-machine barrel 7 comprises a flat double-machine barrel first section AA and a flat double-machine barrel second section BB which are connected together through flanges, a hollow heat sleeve 70 which can heat the flat double-machine cylinder 7 is sleeved on the outer wall of one section AA of the flat double-machine cylinder between the flange and the material inlet 71, a hot gas inlet 701 is provided at the top of the hollow heat jacket 70, a condensate outlet 702 is provided at the bottom of the hollow heat jacket 70, the outer wall of a flat double-barrel two-section BB close to a material outlet is wound with a temperature adjusting pipe capable of adjusting the temperature of the flat double-barrel 7, an extruding spiral rib 81 comprises an extruding feeding section EE, an extruding melting section FF and an extruding discharging section GG, the extruding discharging section GG comprises an extruding discharging section GG1 and an extruding discharging section GG2, the spiral rib width of the extruding discharging section GG2 is smaller than that of an extruding discharging section GG1, and the left end of the extruding discharging section GG1 and the extruding discharging section GG2 correspond to the flat double-barrel 7 where the temperature adjusting pipe is located. The temperature adjusting pipe is spiral, and a spiral adjusting pipe connecting groove 72 is arranged on the outer wall of the flat double-machine cylinder 7 corresponding to the temperature adjusting pipe. A barrel vent hole 73 is arranged on the outer wall of the flat double barrel 7 close to the adjusting pipe connecting groove 72, and the barrel vent hole 73 is a through hole which is vertically arranged. A barrel positioning concave part 75 is arranged on the outer wall of the bottom of the flat double barrel 7 between the end part of the adjusting pipe connecting groove 72 and the barrel vent hole 73, and barrel threaded holes 76 are distributed on the bottom surface of the barrel positioning concave part 75. Barrel positioning screw holes 77 are axially distributed in the top of the flat double-barrel 7, the barrel positioning screw holes 77 between the adjusting pipe connecting groove 72 and the material inlet 71 are distributed at equal intervals, and the distance between the barrel positioning screw holes 77 on the adjusting pipe connecting groove 72 is smaller than the distance between the barrel positioning screw holes 77 between the adjusting pipe connecting groove 72 and the material inlet 71.

The material extruding and melting section FF is a double-helix, the material extruding and melting section FF comprises an extruding and melting section FF1, an extruding and melting section FF2 and an extruding and melting section FF3, the extruding and melting section FF1 and the extruding and melting section FF2 are double-helix, the extruding and melting section FF3 is a single-helix, the material extruding and discharging section GG is a three-helix, a spiral material extruding and returning groove 78 is arranged on the extruding and melting section FF2, the spiral direction of the material extruding and returning groove 78 is opposite to the spiral direction of the extruding and melting section FF2, the distance from the extruding and feeding section EE to the extruding and melting section FF is reduced in sequence, and the distance between the threads of the extruding and discharging section GG is larger than the maximum distance between the extruding and feeding section EE.

The tapered double-cylinder 1 has the specific structure that an alloy layer D is arranged on the inner wall of a cylinder section A between a feed port 11 and a right end opening of the cylinder section A, a first wear-resistant sleeve 31 penetrating through the cylinder section B is arranged on the inner wall of the cylinder section B, a second wear-resistant sleeve 32 penetrating through the cylinder section C is arranged on the inner wall of the cylinder section C, the left end surface of the first wear-resistant sleeve 31 is flush with the left end surface of the cylinder section B, the right end surface of the first wear-resistant sleeve 31 is flush with the right end surface of the cylinder section B, the left end surface of the second wear-resistant sleeve 32 is flush with the left end surface of the cylinder section C, the right end surface of the second wear-resistant sleeve 32 is flush with the right end surface of the cylinder section C, the right opening diameter of the alloy layer D is the same as the left opening diameter of the first wear-resistant sleeve 31, the right opening diameter of the first wear-resistant sleeve 31 is the same as the left opening diameter of the second wear-resistant sleeve 32, and is the same as the alloy layer D, The outer surfaces of the screws corresponding to the first wear-resistant sleeve 31 and the second wear-resistant sleeve 32 are provided with surface alloy layers K, and the conical head of any screw extends out of the conical double barrel by 13-5 mm. A connecting flange 12 is arranged at the left end of the machine barrel section B, the outer diameter of the connecting flange 12 is the same as the diameter of the machine barrel section A, connecting holes which can be sequentially matched with flange through holes of the connecting flange 12 are distributed on the right end face of the machine barrel section A, the machine barrel section B comprises a first machine barrel section B1 and a second machine barrel section B2, the diameter of the first machine barrel section B1 is smaller than the diameter of the connecting flange 12 and larger than the diameter of the second machine barrel section B2, a limiting groove 13 is arranged at the joint of the first machine barrel section B1 and the connecting flange 12, a lantern ring 14 is arranged in the limiting groove 13, and the outer diameter of the lantern ring 14 is larger than the minimum circular diameter J formed by connecting the outer edges of the flange through holes on the connecting flange 12; and the outer walls of the first machine barrel section B1 and the second machine barrel section B2 are respectively provided with a positioning screw hole 15, and the bottom end of the positioning screw hole 15 is an arc end 151 which can be matched with a positioning screw. The opening diameter mentioned above means the diameter of two formed circles forming the opening, and the same opening diameter is equivalent to the same diameter of the corresponding two formed circles.

The screw rib 21 comprises a feeding section E, a melting section F and a discharging section G, the feeding section E comprises a feeding section E1 and a feeding section E2, the melting section F comprises a melting section F1, a melting section F2 and a melting section F3, the discharging section G comprises a discharging section G1, a discharging section G2 and a discharging section G3, the screw rib width of the feeding section E1 is larger than that of the feeding section E2, the screw rib width of the melting section F1 is larger than that of the melting section F2, the feeding section E, the melting section F1 and the melting section F2 are double screw ribs, the discharging section G is a three screw rib, the melting section F3 is a single screw rib, the screw rib intervals from the feeding section E to the melting section F are sequentially reduced, and the screw rib interval of the discharging section G is larger than the maximum screw rib interval of the feeding section E; spiral backflow grooves 18 are circumferentially distributed on the melting second section F2, the radial section of each backflow groove 18 is semicircular, each backflow groove 18 is divided into a backflow first section H1 and a backflow second section H2, the left end of the backflow first section H1 is high, the right end of the backflow first section H1 is low, and the right end of the backflow first section H1 is opposite to the left end of the backflow second section H2.

Claims

1. An injection molding machine for injection molding comprises a conical double-cylinder (1) and two screws respectively penetrating through corresponding through holes in the conical double-cylinder (1), wherein a feed port (11) is formed in the side wall of one end of the conical double-cylinder (1), a discharge port is formed in the other end of the conical double-cylinder (1), the feed port (11) and the discharge port are communicated with the through holes, each screw comprises a conical rod body (2) and screw ribs (21) arranged on the rod body (2), the screw ribs (21) of any screw extend into the screw rib gaps of the other screw, a processing gap for extruding materials is reserved between the extending screw ribs (21) and the outer surface of the other corresponding screw, the conical double-cylinder (1) comprises a cylinder section (A), a cylinder section (B) and a cylinder section (C), and the feed port (11) is located on the cylinder section (A), the discharge gate is located barrel three-section (C), its characterized in that: the discharge port is communicated with a material inlet (71) of the flat double-screw machine barrel combined structure through a sealed conveying pipe (9), and a rough-processed material output from the discharge port of the conical double-screw machine barrel (1) is subjected to secondary melt extrusion in the flat double-screw machine barrel combined structure and then leaves an injection molding machine from a material outlet of the flat double-screw machine barrel combined structure;

the flat double-screw machine barrel combined structure comprises a flat double-screw machine barrel (7) and two cylindrical screws which are respectively arranged in corresponding through holes of the flat double-screw machine barrel (7) in a penetrating mode, a material inlet (71) is formed in the side wall of one end of the flat double-screw machine barrel (7), a material outlet is formed in the other end of the flat double-screw machine barrel (7), the material inlet (71) and the material outlet are communicated with the through holes, each cylindrical screw comprises a cylindrical rod body (8) and extrusion screw ribs (81) arranged on the cylindrical rod body (8), the extrusion screw rib (81) of any cylindrical screw extends into a gap between the extrusion screw ribs (81) of the other cylindrical screw, and a processing gap for extruding materials is reserved between the inserted extrusion screw ribs (81) and the outer surface of the other corresponding cylindrical screw; the flat double machine barrel (7) comprises a flat double machine barrel section (AA) and a flat double machine barrel section (BB), the flat double machine barrel section (AA) and the flat double machine barrel section (BB) are connected together through a flange, a hollow hot sleeve (70) capable of heating the flat double machine barrel (7) is sleeved on the outer wall of the flat double machine barrel section (AA) between the flange and the material inlet (71), a hot air inlet (701) is arranged at the top of the hollow hot sleeve (70), and a condensate outlet (702) is arranged at the bottom of the hollow hot sleeve (70).

2. An injection molding machine according to claim 1, wherein: the winding has the temperature regulation pipe that can adjust flat twin-tub (7) temperature on the flat twin-tub two-section (BB) outer wall that is close to the material export, crowded material spiral shell arris (81) are including crowded material feeding section (EE), crowded material melting section (FF) and crowded material ejection of compact section (GG), crowded material ejection of compact section (GG) is including crowded material ejection of compact one section (GG1) and crowded material ejection of compact two-section (GG2), and the spiral shell arris width of crowded material ejection of compact two-section (GG2) is less than the spiral shell arris width of crowded material ejection of compact one section (GG1), and the left end of crowded material ejection of compact one section (GG1) and crowded material ejection of compact two-section (GG2) are corresponding with flat twin-tub (7) that temperature.

3. An injection molding machine according to claim 2, wherein: the temperature adjusting pipe is spiral, and a spiral adjusting pipe connecting groove (72) is arranged on the outer wall of the flat double machine barrel (7) corresponding to the temperature adjusting pipe.

4. An injection molding machine according to claim 3, wherein: a cylinder vent hole (73) is arranged on the outer wall of the flat double cylinder (7) close to the adjusting pipe connecting groove (72), and the cylinder vent hole (73) is a through hole which is vertically arranged.

5. An injection molding machine according to claim 4, wherein: a cylinder positioning concave part (75) is arranged on the outer wall of the bottom of the flat double cylinder (7) between the end part of the adjusting pipe connecting groove (72) and the cylinder vent hole (73), and cylinder threaded holes (76) are distributed on the bottom surface of the cylinder positioning concave part (75).

6. An injection molding machine according to claim 5, wherein: barrel positioning screw holes (77) are axially distributed in the top of the flat double barrels (7), the barrel positioning screw holes (77) between the adjusting pipe connecting groove (72) and the material inlet (71) are distributed at equal intervals, and the distance between the barrel positioning screw holes (77) on the adjusting pipe connecting groove (72) is smaller than the distance between the barrel positioning screw holes (77) between the adjusting pipe connecting groove (72) and the material inlet (71).

7. An injection molding machine according to claim 2, wherein: the material extruding and feeding section (EE) is double-spiral ribs, the material extruding and melting section (FF) comprises a material extruding and melting section (FF1), a material extruding and melting section (FF2) and a material extruding and melting section (FF3), the material extruding and melting section (FF1) and the material extruding and melting section (FF2) are double-spiral ribs, the material extruding and melting section (FF3) is a single spiral rib, the material extruding and discharging section (GG) is a three spiral rib, a spiral material extruding and returning groove (78) is arranged on the material extruding and melting section (FF2), the spiral direction of the material extruding and returning groove (78) is opposite to the spiral direction of the material extruding and melting section (FF2), the pitch between the material extruding and feeding section (EE) and the material extruding and melting section (FF) is reduced in sequence, and the pitch between the material extruding and discharging section (GG) is larger than the maximum pitch between the material extruding and feeding section (EE).

8. An injection molding machine according to any one of claims 1 to 7, wherein: the conical double machine barrel (1) has the specific structure that an alloy layer (D) is arranged on the inner wall of the machine barrel section (A) between the feed port (11) and the right end opening of the machine barrel section (A), a first wear-resistant sleeve (31) penetrating through the machine barrel section (B) is arranged on the inner wall of the machine barrel section (B), a second wear-resistant sleeve (32) penetrating through the machine barrel section (C) is arranged on the inner wall of the machine barrel section (C), the left end surface of the first wear-resistant sleeve (31) is flush with the left end surface of the machine barrel section (B), the right end surface of the first wear-resistant sleeve (31) is flush with the right end surface of the machine barrel section (B), the left end surface of the second wear-resistant sleeve (32) is flush with the left end surface of the machine barrel section (C), the right end surface of the second wear-resistant sleeve (32) is flush with the right end surface of the machine barrel section (C), the right opening diameter of the alloy layer (D) is the same as the left, the diameter of a right opening of the first wear-resistant sleeve (31) is the same as that of a left opening of the second wear-resistant sleeve (32), a surface alloy layer (K) is arranged on the outer surface of each screw corresponding to the alloy layer (D), the first wear-resistant sleeve (31) and the second wear-resistant sleeve (32), and the conical head of any screw extends out of the conical double machine barrel (1) by 3-5 mm.

9. An injection molding machine according to claim 8, wherein: a connecting flange (12) is arranged at the left end of a second barrel section (B), the outer diameter of the connecting flange (12) is the same as the diameter of the first barrel section (A), connecting holes which can be sequentially matched with flange through holes of the connecting flange (12) are distributed on the right end face of the first barrel section (A), the second barrel section (B) comprises a first barrel section (B1) and a second barrel section (B2), the diameter of the first barrel section (B1) is smaller than that of the connecting flange (12) and larger than that of the second barrel section (B2), a limiting groove (13) is arranged at the joint of the first barrel section (B1) and the connecting flange (12), a lantern ring (14) is arranged in the limiting groove (13), and the outer diameter of the lantern ring (14) is larger than the minimum circle diameter (J) formed by connecting the outer edges of the flange through holes on the connecting flange (12); and the outer walls of the first machine barrel section (B1) and the second machine barrel section (B2) are respectively provided with a positioning screw hole (15), and the bottom end of the positioning screw hole (15) is an arc end (151) which can be matched with a positioning screw.

10. An injection molding machine according to claim 8, wherein: the screw edge (21) comprises a feeding section (E), a melting section (F) and a discharging section (G), the feeding section (E) comprises a feeding section (E1) and a feeding section (E2), the melting section (F) comprises a melting section (F1), a melting section (F2) and a melting section (F3), the discharging section (G) comprises a discharging section (G1), a discharging section (G2) and a discharging section (G3), the width of the screw ridge of the feeding section (E1) is larger than that of the screw ridge of the feeding section (E2), the width of the screw ridge of the melting section (F1) is larger than that of the melting section (F2), the feeding section (E), the melting section (F1) and the melting section (F2) are both double screw ridges, the discharging section (G) is a triple screw ridge, the melting section (F3) is a single screw ridge, the distances between the screw ridges of the feeding section (E) and the melting section (F) are sequentially reduced, and the distance between the screw ridges of the discharging section (G) is larger than the maximum distance between the screw ridges of the feeding section (E); spiral backflow grooves (18) are circumferentially distributed on the melting second section (F2), the radial section of each backflow groove (18) is semicircular, each backflow groove (18) is divided into a backflow first section (H1) and a backflow second section (H2), the left end of the backflow first section (H1) is high, the right end of the backflow first section (H1) is low, and the right end of the backflow first section (H1) is opposite to the left end of the backflow second section (H2).