CN110271157B

CN110271157B - Injection molding machine

Info

Publication number: CN110271157B
Application number: CN201910538081.3A
Authority: CN
Inventors: 张新华; 邵舒嘉; 卢丽娟; 王秀庆; 潘露丹; 何绍木; 陈坤
Original assignee: University of Shaoxing
Current assignee: University of Shaoxing
Priority date: 2019-06-20
Filing date: 2019-06-20
Publication date: 2021-03-02
Anticipated expiration: 2039-06-20
Also published as: CN110271157A

Abstract

The invention discloses an injection molding machine, which comprises a material storage component, a material injection component and a material injection component, wherein the material storage component is used for storing materials and comprises a material storage barrel and a hot melting barrel communicated with the material storage barrel; the screw rod component is arranged in the hot melting cylinder and used for pushing the plastic particles to move along the length direction of the hot melting cylinder; the mould part is matched with the hot melting part, and comprises a rack, a first mould arranged on the rack, a second mould matched with the first mould and a driving piece for driving the second mould to move up and down. The driving piece is arranged to drive the second die to be opened, so that the process can be quickly finished without manual operation, manual operation is omitted, the time-saving and labor-saving effects are achieved, the first die and the second die can be opened, the formed plastic can be conveniently taken out of the die, the operation is convenient, and the production efficiency is improved.

Description

Injection molding machine

Technical Field

The invention belongs to the technical field of plastic processing, and particularly relates to an injection molding machine.

Background

An injection molding machine is a main molding device for making thermoplastic plastics or thermosetting materials into plastic products with various shapes by using a plastic molding die. The method is a technological process of injecting the plastic of a vertical injection molding machine in a molten state, which is plasticized, into a closed mold cavity by means of the thrust of a screw, and obtaining a product after solidification and shaping. Is widely applied to various fields of national defense, electromechanics, automobiles, transportation, building materials, packaging, agriculture, cultural and educational sanitation and daily life of people. The prior injection molding machine comprises a heating box, a machine barrel, a threaded rod, a feed inlet, a nozzle and a bracket; the machine barrel is transversely arranged in the middle of the heating box through a support, the threaded rod is arranged in the machine barrel, the feed inlet is arranged on the rear portion of the machine barrel, and the nozzle is arranged on the front portion of the machine barrel.

The first mold and the second mold are usually required to be opened manually in the using process of the mold of the existing injection molding machine, the process is long in time consumption, a large amount of manpower is required to be consumed manually in the operating process, the operating efficiency is low, and the production efficiency is influenced.

Disclosure of Invention

The invention provides the injection molding machine with high production efficiency in order to overcome the defects of the prior art.

In order to achieve the purpose, the invention adopts the following technical scheme: an injection molding machine comprises

The material storage component is used for storing materials and comprises a material storage barrel and a hot melting barrel communicated with the material storage barrel;

the screw rod component is arranged in the hot melting cylinder and used for pushing the plastic particles to move along the length direction of the hot melting cylinder;

the hot melting component is arranged on the outer wall of the hot melting barrel, is used for melting plastic particles in the hot melting barrel, and comprises a heating part and a heat conducting part matched with the heating part, and at least part of the heat conducting part is arranged in the hot melting barrel;

the waste heat recovery component is matched with the hot melting component and is used for absorbing partial heat of the hot melting component into the storage cylinder so as to preheat plastic particles positioned at the lower part of the storage cylinder;

the mould part is matched with the hot melting part, and comprises a rack, a first mould arranged on the rack, a second mould matched with the first mould and a driving piece for driving the second mould to move up and down.

The waste heat recovery component is arranged, so that heat emitted by the hot melting component can be recovered, the heat of the hot melting component can be recycled, the heat loss is reduced, the heat utilization rate is improved, and the energy consumption is reduced; the heat is transferred to the lower part of the storage barrel, so that the plastic particles on the lower part are preheated, and the plastic particles reach a certain temperature before entering the machine barrel, so that the plastic particles can be quickly melted in the material barrel, the melting efficiency of the plastic particles is improved, and the injection molding rate is improved; in addition, the plastic particles are preheated in the early stage, so that the temperature in the machine barrel does not need to be too high, namely, the electric energy needed by the hot melting part is reduced, the consumption of the electric energy is reduced, and the economic cost is reduced; the plastic particles at the lower part of the machine barrel are heated, so that the heating time of the plastic particles at the lower part of the machine barrel is short, a partially molten state cannot occur, the condition that the lower part of the material storage barrel is blocked due to the fact that all the particles are bonded together is avoided, and the plastic particles can smoothly enter the hot melting barrel; open through setting up driving piece drive second mould, need not manual operation completion that can be quick at this in-process, it has saved manual operation, reaches labour saving and time saving's effect, should open for first mould and second mould moreover to the convenience takes out fashioned plastics from the mould, convenient operation improves production efficiency.

Furthermore, a positioning bracket is vertically arranged on the rack, and a positioning track matched with the second mold is arranged on the positioning bracket; the positioning rail is arranged, so that the motion stability of the second die can be guaranteed in the process of up-down movement of the second die, the second die is prevented from deviating to cause deviation between the first die and the second die, and the qualified product after molding is guaranteed.

Furthermore, a positioning convex part is arranged on the second die, and a rolling part matched with the positioning track is arranged on the positioning convex part; the arrangement of the rolling part can reduce the friction force between the positioning convex part and the positioning track, and the second die can be conveniently and quickly lifted by the driving part.

Furthermore, an elastic piece is connected to the end of the driving piece, and the elastic piece is connected with the second die; set up the elastic component and can be in the in-process that the second mould was pushed down, the elastic component takes place the compression to elasticity on the elastic component is applyed on the second mould, makes to be connected closely between second mould and the first mould, and consequently the gap between first, the second mould is very little, improves the quality of plastic products after the shaping.

Furthermore, a clamping groove is formed in the first die, and an extending part capable of being inserted into the clamping groove is formed in the second die; set up the extension and insert to the screens groove in the middle of, can be spacing each other between the lateral wall of extension and the inner wall in screens groove, avoid the second mould to have the deviation relative to first mould, guarantee plastics off-the-shelf outward appearance.

Further, the waste heat recovery component comprises a heat insulation piece, an air supply piece matched with the heat insulation piece, a heat conduction pipe fitting, a heat transfer base matched with the heat conduction pipe fitting and a heat dissipation piece arranged on the heat transfer base, and the heat dissipation piece and the heat transfer base are both arranged in the storage cylinder; set up the heat-insulating part can effectually keep apart the heat, reduce the heat and outwards give off to in the middle of the enough heat of guarantee gets into to heat conduction pipe fitting, thereby carry out effectual utilization to the heat, and set up air supply part and then can blow the heat of inside, make the heat blown out, avoid radiating piece high temperature and cause plastic granules to melt, cause plastic granules to glue on radiating piece, moreover the heat transfer base can also be to the effectual support of radiating piece, and the radiating piece of being convenient for distributes away the heat fast.

Further, an annular pipe communicated with the heat conduction pipe is sleeved outside the storage barrel, and the annular pipe is connected with the heat transfer base through at least three branch pipes; set up annular pipe fitting can be convenient for the heat and get into in the middle of this annular pipe fitting, then even see off in the middle of the three branch pipe fittings, guarantee that every branch pipe fitting sees off the heat unanimous basically, avoid causing the untimely of airing exhaust because of the diameter of a pipe fitting is little, cause inside pressure grow.

In conclusion, the driving piece is arranged to drive the second die to open, so that the process can be quickly finished without manual operation, manual operation is omitted, the time and labor are saved, the first die and the second die can be opened, the molded plastic can be conveniently taken out of the die, the operation is convenient, and the production efficiency is improved.

Drawings

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

Fig. 2 is an enlarged view of a in fig. 1.

Fig. 3 is an enlarged view of B in fig. 2.

Fig. 4 is a schematic partial structure diagram according to a first embodiment of the present invention.

Fig. 5 is a schematic structural diagram of a second embodiment of the present invention.

Fig. 6 is a schematic partial structure diagram of a second embodiment of the present invention.

Fig. 7 is a partial structural diagram of a second embodiment of the present invention.

Fig. 8 is a schematic structural diagram of a third embodiment of the present invention.

Fig. 9 is a partial structural sectional view of a third embodiment of the present invention.

Detailed Description

In order to make the technical solutions of the present invention better understood, 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.

The first embodiment is as follows:

as shown in fig. 1, an injection molding machine comprises a storage component 1, a screw component 2, a hot melting component 3 and a waste heat recovery component 4, wherein the storage component 1 is used for storing plastic particles and providing a space for melting the plastic particles, the storage component 1 comprises a storage cylinder 11 and a hot melting cylinder 12, the hot melting cylinder 12 is a metal cylinder which is transversely arranged, the storage cylinder 11 is a metal cylinder which is longitudinally arranged, and the storage cylinder 11 is communicated with the hot melting cylinder 12, so that materials in the storage cylinder 11 can enter the hot melting cylinder 12; the screw component 2 comprises a screw 21 and a motor 22, the motor 22 is connected with the screw 21 so as to drive the screw 21 to rotate, the screw 21 is positioned in the hot melting cylinder 12 and pushes plastic particles to move forwards, and the technology is the prior art; the hot melting component 3 is used for melting plastic particles entering the hot melting barrel 12, the hot melting component 3 comprises a heating part 31 and a heat conducting part 32, the heating part 31 is a resistance wire communicated with a circuit, the heating part 31 is arranged on the outer wall of the hot melting barrel 12, the heat conducting part 32 is a metal rod, part of the heat conducting part 32 is inserted into the hot melting barrel 12, the other end of the heat conducting part 32 is connected with the heating part 31, and therefore heat in the heating part 31 can be transferred into the hot melting barrel 12, and the plastic particles in the hot melting barrel 12 are further melted.

Further, the waste heat recovery component 4 is used for absorbing part of heat generated in the hot melting component 3, and further transferring the heat into the storage barrel 11 so as to preheat plastic particles at the lower part of the storage barrel 11; the waste heat recovery component 4 comprises a heat insulation part 41, an air supply part 42, a heat conduction pipe 43, a heat transfer base 44 and a heat dissipation part 45, the heat insulation part 41 is wrapped outside the hot melting cylinder 12, the heating part 31 is positioned between the outer wall of the hot melting cylinder 12 and the heat insulation part 41, the heat insulation part 41 comprises a heat insulation layer and a fixed layer, the heat insulation layer is absorbent cotton cloth bonded with aluminum foil, the fixed layer is a metal sheet, and the heat insulation layer is bonded on the inner wall of the fixed layer; the air supply part 42 is arranged outside the fixed layer, the air supply part 42 is a fan, and the air supply part supplies air to the heat insulation part 41 from the environment; the heat conduction pipe fitting 43 is arranged between the outer wall of the hot melt cylinder 12 and the heat insulation member 41, the heat conduction pipe fitting 43 is a metal pipeline, air blown by the air blowing member 42 can enter the heat conduction pipe fitting 43, then is sent to the heat transfer base 44 through the heat conduction pipe fitting 43, finally enters the heat dissipation member 45 through the heat transfer base 44 and is discharged outwards, the heat transfer base 44 and the heat dissipation member 45 are arranged in the storage cylinder 11, and the specific position is that the heat conduction pipe fitting is arranged in the middle of the storage cylinder 11 and is arranged at the lower part of the storage cylinder 11.

Further, an annular pipe fitting 49 is sleeved on the storage barrel 11, the annular pipe fitting 49 is an annular metal pipeline, the heat conducting pipe fitting 43 is communicated with the annular pipe fitting 49, wind energy blown into the heat conducting pipe fitting 45 can enter the annular pipe fitting 49, three branch pipe fittings 46 are communicated with the annular pipe fitting 49, each branch pipe fitting 46 is a metal pipeline with a small aperture, each branch pipe fitting 46 is in a shape of a triangular prism, each branch pipe fitting 46 is provided with a heat discharging hole 461, each heat discharging hole 461 is a round opening with a downward opening, each heat discharging hole 461 is further provided with a layer of anti-blocking net 462, each anti-blocking net 462 is a metal net, and each anti-blocking net 462 can effectively ensure that each heat discharging hole 461 is blocked; establish the heat extraction hole on the branch pipe, its partial heat is discharged from this heat extraction hole, preheats plastic granules, establishes the heat extraction hole into the opening downwards in addition, can avoid plastic granules to plug up the heat extraction hole, avoids clearing up the heat extraction hole, establishes the branch pipe spare into the rhombus post shape, avoids plastic granules to fall on a pipe spare for a long time.

Specifically, the heat transfer base 44 is a cylindrical metal base, the heat transfer base 44 is provided with a heat transfer cavity 441, the branch pipe 46 is communicated with the heat transfer cavity 441, so that heat entering the branch pipe 46 can enter the heat transfer cavity 441, the heat transfer cavity 441 is further provided with a plurality of heat dissipation ribs 442, the heat dissipation ribs 442 are metal sheets, the middle part of the heat transfer base 44 is provided with a circular opening, and the opening is communicated with the heat transfer cavity 441, so that the heat entering the heat transfer cavity 441 can be transmitted out of the opening; set up the heat transfer chamber and can be convenient for hot-blast entering this heat transfer intracavity in the branch pipe, and set up the protruding muscle of heat dissipation and then can be convenient for the quick transmission of partial heat to the surface of heat transfer base, speed up heat transfer to plastic granules's speed, the protruding muscle of heat dissipation can also strengthen the fastness of heat transfer base moreover, has improved the life of heat dissipation base.

Further, the heat sink 45 is a metal pipe with a tapered upper portion, the heat sink 45 has a plurality of heat dissipation holes 450, and the heat dissipation holes 450 are inclined holes inclined from top to bottom; the heat dissipation holes are inclined from top to bottom, so that the plastic particles are not easy to block the heat dissipation holes, and the heat dissipation effect of the heat dissipation holes is guaranteed; the arrangement of the disturbance convex ribs can ensure that plastic particles shake in the rotating process of the heat dissipation member when the heat dissipation member rotates, so that the falling efficiency of the plastic particles is accelerated; a plurality of disturbance convex ribs 451 are arranged on the side wall of the heat sink 45, and the disturbance convex ribs 451 are convex ribs with arc-shaped surfaces; the heat sink 45 is movably connected with the heat transfer base 441 through a bearing 47; the heat dissipation device is movably connected with the heat dissipation device, and the heat dissipation device can be driven to rotate back and forth in a small range when gas is blown in, so that plastic particles are prevented from being extruded on the heat dissipation device due to the fact that the heat dissipation device is not moved, and hot air blown out of the heat dissipation device cannot be effectively discharged outwards.

Specifically, the bearing element 47 includes an outer bearing ring 471, balls 472, and an inner bearing ring 473; the outer bearing ring 471 and the inner bearing ring 473 are both metal rings, the balls 472 are steel balls, and the balls 472 are located between the outer bearing ring 471 and the inner bearing ring 473; the inner bearing ring 473 is connected to the heat transfer base 44, which may be welded; the outer bearing ring 471 is detachably connected with the heat sink 45, specifically, a rotation stopping convex part 455 is arranged on the inner wall of the heat sink 45, the upper part of the outer wall of the outer bearing ring 471 is recessed inwards to form a rotation stopping concave part 475, the rotation stopping convex part 455 can be inserted into the rotation stopping concave part 475, and the outer bearing ring 471 and the heat sink 45 are connected together by screws; the outer bearing ring is detachably connected with the heat dissipation part, so that the outer heat dissipation part is convenient to take down, and the heat dissipation part is convenient to maintain; the heat dissipation piece is connected with the outer bearing ring, and the balls are positioned in the heat dissipation piece in such a way, so that plastic particles are prevented from falling between the outer bearing ring and the inner bearing ring to cause the bearing piece to be clamped; the provision of the rotation stop projections and recesses facilitates the snap-in of the heat sink into the outer bearing ring and ensures that the heat sink does not rotate or slip relative to the outer bearing ring.

In order to facilitate the rotation of the heat sink 45, a driving motor 50 is provided outside the storage cylinder 11, the driving motor 50 is a conventional motor, and the driving motor 50 drives the heat sink 45 to rotate through a transmission structure 5; the driving heat dissipation piece of the driving motor rotates, so that the heat dissipation piece accelerates the downward falling of plastic particles in the use process, and the falling speed of the particles is prevented from being influenced by the arrangement of the heat dissipation piece.

Specifically, the transmission structure 50 includes a first bevel gear 51, a second bevel gear 52 and a transmission shaft 53, the first bevel gear 51 is a metal gear ring, the first bevel gear 51 is sleeved on the heat sink 45, an upper end surface of the first bevel gear 51 is an inclined surface inclined from top to bottom, the inclined surface can prevent materials from falling on the first bevel gear 51 for a long time, and the teeth are arranged on the lower end surface; the second bevel gear 52 is a conventional bevel gear on the market, the transmission shaft 53 is connected with the second bevel gear 52, the transmission shaft 53 is a metal shaft, the transmission shaft 53 is positioned right above the branch pipe 461, and the transmission shaft is arranged right above the branch pipe, so that the influence of the rotation shaft on the falling of plastic particles is reduced; the transmission shaft 53 is connected to the second bevel gear 52, and the transmission shaft 53 is connected to the driving motor 50, so that the driving motor 50 drives the heat sink 45 to rotate.

Example two:

as shown in fig. 5 to 7, the present embodiment is different from the first embodiment in that a mold member 6 is added, specifically: the die part 6 comprises a frame 60, a first die 61, a second die 62 and a driving part 63, wherein the frame 60 is a metal frame, the first die and the second die are metal dies, the driving part 63 is an air cylinder, and the driving part 63 is matched with the second die 62 to drive the second die 62 to move up and down.

Specifically, a positioning bracket 601 is arranged on the machine frame 60, the positioning bracket 601 is a metal bracket perpendicular to the machine frame 60, and the driving member 63 is connected with the driving member 63 through a transverse metal rod; the positioning bracket 601 is provided with a positioning track 602, the positioning track 602 is a metal track with an inward-recessed middle portion, the second mold 62 is provided with a positioning protrusion 621, the positioning protrusion 621 is inserted into the positioning track 602, the positioning protrusion 602 is provided with a rolling member 622, the rolling member 622 is a metal bead, and the rolling member 622 contacts with the inner wall of the positioning track 602.

Further, an elastic member 64 is connected to an end of the driving member 63, the elastic member 64 is a spring, and the elastic member 64 is connected to the second mold 62, so that the elastic member 64 is located between the driving member 63 and the second mold 62; the two sides of the first mold 61 are provided with clamping grooves 610, the clamping grooves 610 are formed by inward concave upper end surfaces of the second mold 62, the upper and lower parts of the second mold 62 are provided with extending parts 620, the extending parts 620 and the second mold 62 are integrally formed, and the extending parts 620 can be inserted into the clamping grooves 610.

Example three:

as shown in fig. 8 to 9, the present embodiment is different from the first embodiment in that a water cooling member 7 is added, specifically: the water cooling part 7 comprises a water cooling tank 71, a water inlet pipe 72, a water outlet pipe 73 and a pump body 74, the water cooling tank 71 is a cylindrical tank body, the water cooling tank 71 is connected with the outer part of the end part of the hot melting cylinder 12, the water inlet pipe 72 is a metal pipeline, the water inlet pipe 72 is communicated with the water cooling tank 71, so that water in the water inlet pipe 71 enters the water cooling tank 71, the water outlet pipe 73 is also a metal pipeline, the water outlet pipe 73 is arranged in an S-shaped bent manner, and the water in the water cooling tank 71 flows out from the water outlet pipe 73; the pump body 74 is a water pump, and the pump body 74 is connected with the water inlet pipe fitting 71, so that water is pumped into the water cooling tank 71; the water outlet pipe 73 has a plurality of heat radiating fins 731.

Further, the water-cooling part 7 further comprises a water storage tank 75, the water storage tank 75 is a plastic tank, a first pipe 751 is arranged at the upper part of the water storage tank 75, and the first pipe 751 is a plastic pipeline; a second pipe 752 is arranged at the lower part of the water storage tank 75, the second pipe 752 is also a plastic pipe, and the second pipe 752 is connected with the pump body 74; the first pipe 751 is movably connected with a locking nut 76, the inner wall of the locking nut 76 is provided with a first convex portion 765, and the first convex portion 765 is a circle of convex ring; a second convex portion 755 is arranged on the outer wall of the first pipe 751, and the second convex portion 755 is a circle of convex ring; a sealing member 765 is arranged between the first protrusion 765 and the second protrusion 755, and the sealing member 765 is a rubber ring.

It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all 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.

Claims

1. An injection molding machine, characterized in that: comprises that

The material storage component (1) is used for storing materials and comprises a material storage barrel (11) and a hot melting barrel (12) communicated with the material storage barrel (11);

the screw rod component (2) is arranged in the hot melting cylinder (12) and is used for pushing the materials to move along the length direction of the hot melting cylinder (12);

the hot melting component (3) is arranged on the outer wall of the hot melting cylinder (12) and used for melting materials in the hot melting cylinder (12), and comprises a heating piece (31) and a heat conducting piece (32) matched with the heating piece (31), wherein at least part of the heat conducting piece (32) is arranged in the hot melting cylinder (12);

the waste heat recovery component (4) is matched with the hot melting component (3) and is used for absorbing partial heat of the hot melting component (3) into the storage barrel (11) to preheat materials positioned at the lower part of the storage barrel (11); the waste heat recovery component (4) comprises a heat insulation piece (41), an air supply piece (42) matched with the heat insulation piece (41), a heat conduction pipe fitting (43), a heat transfer base (44) matched with the heat conduction pipe fitting (43) and a heat dissipation piece (45) arranged on the heat transfer base (44), wherein the heat dissipation piece (45) and the heat transfer base (44) are both arranged in the storage barrel (11); an annular pipe fitting (49) communicated with the heat conduction pipe fitting (43) is sleeved outside the material storage barrel (11), and the annular pipe fitting (49) is connected with the heat transfer base (44) through at least three branch pipe fittings (46); the heat transfer base (44) is a cylindrical metal base, a heat transfer cavity (441) is arranged on the heat transfer base (44), the branch pipe piece (46) is communicated with the heat transfer cavity (441), so that heat entering the branch pipe piece (46) can enter the heat transfer cavity (441), a plurality of heat dissipation convex ribs (442) are further arranged in the heat transfer cavity (441), the heat dissipation convex ribs (442) are metal sheets, a circular opening is arranged in the middle of the heat transfer base (44), and the opening is communicated with the heat transfer cavity (441); the heat dissipation member (45) is a metal pipe with a conical upper part, the heat dissipation member (45) is provided with a plurality of heat dissipation holes (450), and the heat dissipation holes (450) are inclined holes which are obliquely arranged from top to bottom; a plurality of disturbance convex ribs (451) are arranged on the side wall of the heat dissipation piece (45), and the disturbance convex ribs (451) are convex ribs with arc-shaped surfaces; the heat dissipation member (45) is movably connected with the heat transfer base (44) through a bearing member (47); a driving motor (50) is arranged outside the material storage barrel (11), and the driving motor (50) drives the heat dissipation member (45) to rotate through a transmission structure (5); the transmission structure (5) comprises a first bevel gear (51), a second bevel gear (52) and a transmission shaft (53), the first bevel gear (51) is a metal gear ring, and the first bevel gear (51) is sleeved on the heat dissipation member (45);

the die component (6) is matched with the hot melting component (3) and comprises a rack (60), a first die (61) arranged on the rack (60), a second die (62) matched with the first die (61) and a driving piece (63) for driving the second die (62) to move up and down;

the water cooling part (7) comprises a water cooling tank (71), a water inlet pipe fitting (72), a water outlet pipe fitting (73) and a pump body (74), wherein the water outlet pipe fitting (73) is provided with a plurality of radiating blades (731); the water-cooling part (7) further comprises a water storage tank (75), the water storage tank (75) is a plastic tank, a first pipe (751) is arranged at the upper part of the water storage tank (75), and the first pipe (751) is a plastic pipeline; a second pipe (752) is arranged at the lower part of the water storage tank (75), the second pipe (752) is also a plastic pipeline, and the second pipe (752) is connected with the pump body (74); the first pipe fitting (751) is movably connected with a locking nut (76).

2. An injection molding machine according to claim 1, wherein: a positioning support (601) is vertically arranged on the machine frame (60), and a positioning track (602) matched with the second die (62) is arranged on the positioning support (601).

3. An injection molding machine according to claim 2, wherein: and a positioning convex part (621) is arranged on the second die (62), and a rolling part (622) matched with the positioning track (602) is arranged on the positioning convex part (621).

4. An injection molding machine according to claim 1, wherein: an elastic piece (64) is connected to the end of the driving piece (63), and the elastic piece (64) is connected with the second die (62).

5. An injection molding machine according to claim 1, wherein: be equipped with screens groove (610) on first mould (61), be equipped with on second mould (62) and insert to extension (620) in screens groove (610).