CN118493760A - Injection molding mechanism of model injection molding machine - Google Patents

Abstract

The present invention relates to the technical field of injection molding machines, and discloses an injection molding mechanism of a model injection molding machine, including an injection plastic tube, the head of the injection plastic tube is equipped with an injection nozzle, the outer wall of the injection plastic tube is fixedly equipped with a heating ring, and the feed port at the tail of the injection plastic tube is equipped with a raw material processing device; the raw material processing device includes a positioning frame, the top of the positioning frame is fixedly equipped with a fixed bracket, the inner wall of the fixed bracket is equipped with a raw material guiding mechanism, and the top of the fixed bracket is equipped with a raw material processing mechanism. Through the arrangement of the top hopper and the guide hopper, the plastic in the top hopper flows toward the middle, the plastic particles flow to the middle position of the guide hopper, and then the plastic particles flow toward the periphery, and gradually the plastic particles fall vertically through the guide hopper to the top of the guide ring, and the number of plastic particles diverted on both sides of the guide ring is the same, which improves the effect of the impurity suction pipeline.

Description

Injection molding mechanism of a model injection molding machine

Technical Field

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

Background Art

Injection molding machine is also known as injection molding machine or injection machine. Many factories call it beer machine, and injection products are called beer parts. It is the main molding equipment that uses plastic molding molds to make plastic products of various shapes from thermoplastics or thermosetting plastics. It is divided into vertical, horizontal, and all-electric types. The injection molding machine can heat the plastic and apply high pressure to the molten plastic to make it eject and fill the mold cavity. The injection molding mechanism is the core mechanism of the injection molding machine. The injection molding mechanism is also called the injection mechanism. The injection mechanism mainly consists of a feeding barrel, a barrel, a screw, a glue assembly, and a nozzle.

The existing plastic granule raw materials are mixed with some dust impurities. When the dust impurities on the plastic granules are not processed and directly added to the melt injection molding, the plastic model will contain insoluble impurities. These impurities will affect the appearance quality and structural stability of the product. Therefore, we need to remove the impurities from the plastic granules.

Summary of the invention

The present invention provides an injection molding mechanism of a model injection molding machine, which solves the problems raised by the above background technology.

The present invention provides the following technical solution: an injection molding mechanism of a model injection molding machine, comprising an injection plastic tube, an injection nozzle is installed at the head of the injection plastic tube, a heating ring is fixedly installed on the outer wall of the injection plastic tube, a raw material processing device is installed on the feed port at the tail of the injection plastic tube, an injection molding screw is rotatably connected to the inner wall of the injection plastic tube, and an injection screw head is installed at one end of the injection molding screw close to the injection nozzle;

The material processing device comprises a positioning frame, a fixing bracket is fixedly mounted on the top of the positioning frame, a material guiding mechanism is installed on the inner wall of the fixing bracket, a material processing mechanism is installed on the top of the fixing bracket, and the material processing mechanism is located in the inner cavity of the material guiding mechanism.

As a preferred technical solution of the present invention, the raw material guiding mechanism includes a top hopper, a guiding hopper is fixedly mounted on the bottom of the top hopper, and the guiding hopper is connected to the raw material processing mechanism through a bearing.

As a preferred technical solution of the present invention, the top hopper is V-shaped, and the inner cavity of the guide hopper is Y-shaped.

As a preferred technical solution of the present invention, a right hopper and a left hopper are provided at the bottom of the guide hopper, and the right hopper and the left hopper are movably connected by a connecting rod, and the connecting rod is fixedly assembled on the positioning frame, and the right hopper and the left hopper are fixed by bolts.

As a preferred technical solution of the present invention, the raw material processing mechanism includes a hollow motor, the power output shaft of the hollow motor is fixedly sleeved with a connecting shaft, the outer wall of the connecting shaft is fixedly equipped with scattering blades, and the scattering blades correspond to the discharge port of the guide hopper.

As a preferred technical solution of the present invention, the outer wall of the connecting shaft is fixedly equipped with a connecting bracket, the outer edge of the connecting bracket is fixedly equipped with a bracket, the top of the bracket is clamped with a guide ring, and the top of the guide ring is located directly below the discharge port of the guide hopper.

As a preferred technical solution of the present invention, the guide ring is in an inverted V shape, and the outer wall of the guide ring is fixedly equipped with a plurality of protrusions, and the plurality of protrusions are evenly distributed.

As a preferred technical solution of the present invention, a cylinder is fixedly mounted on the inner wall of the guide ring, a Z-shaped groove is opened on the outer wall of the bracket, and four Z-shaped grooves and four cylinders are respectively provided.

As a preferred technical solution of the present invention, a debris suction pipe is installed on the outer wall of the connecting shaft, the debris suction pipe is connected to the connecting shaft, a plurality of through holes are opened on the outer wall of the debris suction pipe, and the debris suction pipe is located directly below the guide ring.

As a preferred technical solution of the present invention, the output shaft at the top of the hollow motor is equipped with a rotating joint, the outer wall of the rotating joint is fixedly equipped with a support frame, the top of the rotating joint is equipped with a suction connecting pipe, the bottom of the connecting shaft is fixedly equipped with a bottom rotating shaft, the outer wall of the bottom rotating shaft is fixedly equipped with a stirring blade, and the bottom of the connecting shaft is fixedly equipped with a spiral blade.

The present invention has the following beneficial effects:

1. The injection molding mechanism of the injection molding machine of this model, through the setting of the top hopper and the guide hopper, the plastic in the top hopper flows to the middle, the plastic particles flow to the middle position of the guide hopper, and then the plastic particles flow to the periphery, and gradually the plastic particles fall vertically through the guide hopper to the top of the guide ring. The number of plastic particles diverted on both sides of the guide ring is the same, which improves the impurity absorption effect of the impurity absorption pipe.

2. The injection molding mechanism of the injection molding machine of the model is connected with the injection molding machine waste gas treatment device on the injection molding machine by connecting the impurity suction connecting pipe. At this time, the rotation of the hollow motor drives the connecting shaft to rotate, and the impurity suction pipe can be rotated. When the impurity suction pipe rotates, the impurity suction pipe rotates around the separated plastic particles, so that the dust and impurities on the plastic particles can be better absorbed. The dust and impurities enter the impurity suction pipe through the through hole, and then are sucked away through the connecting shaft, the hollow motor and the impurity suction connecting pipe. The dust and impurities on the plastic particles can be processed, thereby solving the problem that some dust and impurities are mixed in the existing plastic particle raw materials, affecting the appearance quality and structural stability of the product;

At the same time, the breaking blades on the connecting shaft rotate, and the feeding port of the top hopper is stirred by the breaking blades, so that the agglomerated plastic particles at the feeding port of the top hopper can be broken up, and the agglomerated plastic raw materials can be prevented from clogging the feeding port of the top hopper.

3. The injection molding mechanism of the injection molding machine of this model diverts the plastic particles through the guide ring, so that the plastic particles flow on both sides of the impurity suction pipe, the density of the falling plastic particles becomes smaller, the plastic particles are better separated from dust impurities, and the plastic particles collide with the bumps on the guide ring, so that the dust impurities attached to the surface of the plastic particles can be knocked off. At the same time, the contact between the plastic particles and the bumps will change the falling trajectory of the plastic particles, making the gap between the plastic particles larger, so that the dust impurities can be better absorbed.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the front three-dimensional structure of the present invention;

FIG2 is a schematic diagram of the back three-dimensional structure of the present invention;

FIG3 is a schematic diagram of the three-dimensional structure of the raw material processing device of the present invention;

FIG4 is a schematic diagram of the internal structure of the raw material processing device of the present invention;

FIG5 is a schematic cross-sectional view of the raw material processing device of the present invention;

FIG6 is an enlarged structural schematic diagram of point A in FIG5 of the present invention;

FIG7 is an enlarged structural schematic diagram of point B in FIG5 of the present invention;

FIG8 is a schematic diagram of the guide ring and bracket structure of the present invention;

FIG9 is an enlarged structural schematic diagram of point C in FIG8 of the present invention;

FIG. 10 is a schematic diagram of the guide ring and the projection structure of the present invention.

In the figure: 1. Plastic injection pipe; 2. Injection nozzle; 3. Heating coil; 4. Raw material processing device;

11. Injection screw; 12. Injection screw head;

41. Positioning frame; 42. Fixed bracket; 43. Raw material guiding mechanism; 44. Raw material processing mechanism;

4301, top hopper; 4302, guide hopper; 4303, bearing; 4304, right hopper; 4305, left hopper; 4306, connecting rod; 4307, bolt;

4401. hollow motor; 4402. connecting shaft; 4403. scattering blades; 4404. connecting bracket; 4405. bracket; 4406. Z-shaped groove; 4407. guide ring; 4408. cylinder; 4409. bump; 4410. impurity suction pipe; 4411. through hole; 4412. bottom rotating shaft; 4413. stirring blade; 4414. spiral blade; 4415. supporting frame; 4416. rotary joint; 4417. impurity suction connecting pipe.

DETAILED DESCRIPTION

The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

Please refer to Figures 1 to 10, an injection molding mechanism of a model injection molding machine includes an injection plastic tube 1, an injection nozzle 2 is installed at the head of the injection plastic tube 1, a heating ring 3 is fixedly installed on the outer wall of the injection plastic tube 1, a raw material processing device 4 is installed at the feed inlet at the tail of the injection plastic tube 1, an injection molding screw 11 is rotatably connected to the inner wall of the injection plastic tube 1, and an injection screw head 12 is installed at one end of the injection molding screw 11 close to the injection nozzle 2;

The raw material processing device 4 includes a positioning frame 41, a fixed bracket 42 is fixedly assembled on the top of the positioning frame 41, a raw material guiding mechanism 43 is installed on the inner wall of the fixed bracket 42, and a raw material processing mechanism 44 is installed on the top of the fixed bracket 42. The raw material processing mechanism 44 is located in the inner cavity of the raw material guiding mechanism 43. By putting the plastic into the raw material guiding mechanism 43, the plastic can flow downward in the raw material guiding mechanism 43. At the same time, the flowing plastic particles are subjected to impurity absorption treatment, the plastic particles are scattered, the plastic can be mixed and stirred, and the plastic particles are evenly fed through the raw material processing mechanism 44, so that the plastic can be purer and the particles are distinct, so that the impurities mixed in the melted plastic are less, which can effectively improve the quality of the plastic model. The plastic particles fall into the injection molding tube 1, and the injection screw 11 rotates to push the plastic particles to move toward the injection nozzle 2. During the movement, the plastic particles are heated by the heating coil 3 to melt the plastic particles into liquid.

In a preferred embodiment, the raw material guide mechanism 43 includes a top hopper 4301, and a guide hopper 4302 is fixedly installed at the bottom of the top hopper 4301. The guide hopper 4302 is connected to the raw material processing mechanism 44 through a bearing 4303. First, the plastic particles enter the top hopper 4301, and then the plastic particles in the top hopper 4301 flow downward. The plastic can fall into the guide hopper 4302, and then the plastic particles fall downward in a vertical form through the guide hopper 4302. When the raw material processing mechanism 44 rotates, the guide hopper 4302 will not rotate with the raw material processing mechanism 44, thereby improving the stability of the device.

In a preferred embodiment, the top hopper 4301 is V-shaped, and the inner cavity of the guide hopper 4302 is Y-shaped. The plastic particles in the top hopper 4301 flow toward the middle and then flow to the center of the guide hopper 4302. Then, the plastic can flow toward the periphery from the center of the guide hopper 4302 and gradually flow into the vertical channel at the bottom of the guide hopper 4302. Therefore, the plastic particles can fall downward in a vertical form, thereby improving the rationality of the device.

In a preferred embodiment, a right hopper 4304 and a left hopper 4305 are provided at the bottom of the guide hopper 4302. The right hopper 4304 and the left hopper 4305 are movably connected via a connecting rod 4306. The connecting rod 4306 is fixedly assembled on the positioning frame 41. The right hopper 4304 and the left hopper 4305 are fixed via bolts 4307. When the bottom of the raw material processing mechanism 44 needs to be repaired and replaced, the bolts 4307 are unscrewed, and then the right hopper 4304 and the left hopper 4305 are rotated to the right and left respectively. At this time, the right hopper 4304 and the left hopper 4305 rotate around the connecting rod 4306, and gradually the bottom of the raw material processing mechanism 44 is exposed, so that the device is easy to replace and overhaul.

In a preferred embodiment, the raw material processing mechanism 44 includes a hollow motor 4401, the power output shaft of the hollow motor 4401 is fixedly sleeved with a connecting shaft 4402, and the outer wall of the connecting shaft 4402 is fixedly equipped with a dispersing blade 4403, and the dispersing blade 4403 corresponds to the discharge port of the guide hopper 4302, and is slowly rotated by the hollow motor 4401. At this time, the rotation of the hollow motor 4401 drives the dispersing blade 4403 to rotate, and the dispersing blade 4403 is used to stir the discharge port of the top hopper 4301, so that the agglomerated plastic particles at the discharge port of the top hopper 4301 can be dispersed, which can prevent the agglomerated plastic raw materials from causing the discharge port of the top hopper 4301 to be blocked, so that the device can feed at a uniform speed.

In a preferred embodiment, the outer wall of the connecting shaft 4402 is fixedly equipped with a connecting bracket 4404, and the outer edge of the connecting bracket 4404 is fixedly equipped with a bracket 4405. The top of the bracket 4405 is clamped with a guide ring 4407, and the top of the guide ring 4407 is located directly below the discharge port of the guide hopper 4302. The plastic particles falling vertically from the guide hopper 4302 fall to the top of the guide ring 4407. At this time, the plastic can be diverted, so that the plastic particles are diverted by the guide ring 4407, so that the plastic particles are changed from one stream to two streams. The two streams of plastic particles are located on both sides of the impurity suction pipe 4410, which is convenient for dust and impurities on the plastic particles to be lifted up, so that the dust and impurities can be better handled.

In a preferred embodiment, the guide ring 4407 is shaped like an inverted V-shape, and the outer wall of the guide ring 4407 is fixedly equipped with a plurality of protrusions 4409, and the plurality of protrusions 4409 are evenly distributed. By setting the shape of the guide ring 4407 to an inverted V-shape, the plastic particles can be better diverted, and by providing a plurality of protrusions 4409 on the guide ring 4407, the plastic particles can contact the protrusions 4409 when falling, and the plastic particles collide with the protrusions 4409, so that dust and impurities attached to the surface of the plastic particles can be knocked off. At the same time, the contact between the plastic particles and the protrusions 4409 will cause the falling trajectory to change, so that the gap between the plastic particles is larger, so that dust and impurities can be better absorbed.

In a preferred embodiment, the inner wall of the guide ring 4407 is fixedly equipped with a cylinder 4408, and the outer wall of the bracket 4405 is provided with a Z-shaped groove 4406, and four Z-shaped grooves 4406 and cylinders 4408 are respectively provided. By placing the guide ring 4407 above the bracket 4405, the cylinder 4408 is located at the center of the Z-shaped groove 4406, and then the cylinder 4408 is rotated to be located at the tail of the Z-shaped groove 4406, and the tail of the Z-shaped groove 4406 is located in the rotation direction of the connecting shaft 4402, so that when the connecting shaft 4402 rotates, the cylinder 4408 will not be detached from the Z-shaped groove 4406, and the guide ring 4407 will not be detached, thereby improving the stability of the device. When disassembling, the guide ring 4407 is lifted up and then rotated in the opposite direction. When the guide ring 4407 cannot be rotated, the guide ring 4407 is lifted up again, and the guide ring 4407 can be removed at this time.

In a preferred embodiment, a debris suction pipe 4410 is installed on the outer wall of the connecting shaft 4402, and the debris suction pipe 4410 is connected to the connecting shaft 4402. A plurality of through holes 4411 are opened on the outer wall of the debris suction pipe 4410. The debris suction pipe 4410 is located directly below the guide ring 4407, so that the separated plastic particles are located on both sides of the debris suction pipe 4410. The hollow motor 4401 drives the connecting shaft 4402 and the debris suction pipe 4410 to rotate. When the debris suction pipe 4410 rotates, the debris suction pipe 4410 rotates around the separated plastic particles, so that the dust and impurities on the plastic particles can be better absorbed. The dust and impurities of the plastic particles separated by the guide ring 4407 enter the debris suction pipe 4410 through the through holes 4411, and are then sucked away through the connecting shaft 4402, the hollow motor 4401 and the debris suction connecting pipe 4417, so that the dust and impurities of the plastic particles can be processed.

In a preferred embodiment, the output shaft at the top of the hollow motor 4401 is installed with a rotary joint 4416, the outer wall of the rotary joint 4416 is fixedly equipped with a support frame 4415, the top of the rotary joint 4416 is installed with a suction connection pipe 4417, the bottom of the connecting shaft 4402 is fixedly equipped with a bottom rotating shaft 4412, the outer wall of the bottom rotating shaft 4412 is fixedly equipped with a stirring blade 4413, the bottom of the connecting shaft 4402 is fixedly equipped with a spiral blade 4414, and the suction connection pipe 4417 is connected to the exhaust gas treatment device, so that the exhaust gas of the injection molding machine can be treated at the same time. The dust and impurities on the plastic particles are processed, and the impurity suction connecting pipe 4417 is connected to the hollow motor 4401 through the rotary joint 4416. When the output shaft of the hollow motor 4401 rotates, it will not drive the impurity suction connecting pipe 4417 to rotate, thereby improving the rationality of the device. The connecting shaft 4402 drives the bottom rotating shaft 4412 to rotate, and the stirring blade 4413 and the spiral blade 4414 follow the rotation. The stirring blade 4413 can mix and stir the plastic particles, and the spiral blade 4414 prevents the feed port from being blocked, and also plays a role in uniform material discharge.

Working principle: when in use, put the plastic raw material into the top hopper 4301, and then the plastic in the top hopper 4301 can flow to the middle, and the plastic particles flow to the middle position of the guide hopper 4302, and then the plastic particles flow to the periphery, and gradually the plastic particles fall downward in a vertical form through the guide hopper 4302, and then the plastic particles fall onto the guide ring 4407. At this time, the plastic particles are diverted by the guide ring 4407, and the plastic particles are located on both sides of the impurity suction pipe 4410. The plastic particles contact the protrusions 4409 on the guide ring 4407, so that the plastic particles are impacted, and the dust and impurities attached to the surface of the plastic particles can be impacted and fall off. At this time, the hollow motor 4401 rotates to drive the connecting shaft 440 2 and the bottom rotating shaft 4412 rotate, and at the same time, dust and impurities are absorbed by the exhaust gas treatment device, and the dust and impurities enter the impurity suction pipe 4410 through the through hole 4411, and are then sucked away through the connecting shaft 4402, the hollow motor 4401 and the impurity suction connecting pipe 4417, and the dust and impurities on the plastic particles can be processed. At the same time, the scattering blades 4403, the impurity suction pipe 4410, the bracket 4405, the guide ring 4407, the stirring blades 4413 and the spiral blades 4414 also rotate, and the impurity suction pipe 4410 rotates to rotate around the diverted plastic particles to absorb dust and impurities, and the scattering blades 4403 stir the discharge port of the top hopper 4301, which is located at the top The plastic particles agglomerated at the discharge port of the hopper 4301 can be broken up, and the various plastic particles are mixed and stirred by the stirring blade 4413 to make the mixture of the various plastic particles more uniform. The spiral blade 4414 discharges the material uniformly from the discharge port and prevents the feed port from being blocked. When the raw material processing mechanism 44 needs to be repaired or replaced, the bolt 4307 is removed, and then the right hopper 4304 and the left hopper 4305 are rotated to the right and left respectively. At this time, the right hopper 4304 and the left hopper 4305 rotate around the connecting rod 4306, and gradually the bottom of the raw material processing mechanism 44 is exposed, and it can be disassembled and repaired at this time. During disassembly, the guide ring 4407 is lifted upward. When the guide ring 4407 cannot be removed, When it is upward, it is then rotated in the opposite direction. When the guide ring 4407 cannot be rotated, the guide ring 4407 is lifted up. At this time, the guide ring 4407 can be removed. During installation, the cylinder 4408 is located at the tail of the Z-shaped groove 4406, and the guide ring 4407 is pressed downward. When the guide ring 4407 cannot be pressed, the guide ring 4407 is rotated clockwise. When the guide ring 4407 cannot be rotated, the guide ring 4407 is pressed downward. When it cannot be pressed, the installation is completed. Subsequently, the plastic particles fall into the injection molding tube 1, and the injection screw 11 is rotated to push the plastic particles toward the injection nozzle 2. During the movement, the plastic particles are heated by the heating coil 3 to melt the plastic particles into liquid.

It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

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

Claims (10)

1. Injection mechanism of model injection molding machine, including moulding plastics material pipe (1), its characterized in that: the injection molding device is characterized in that an injection nozzle (2) is arranged at the head of the injection molding material pipe (1), a heating ring (3) is fixedly arranged on the outer wall of the injection molding material pipe (1), a raw material treatment device (4) is arranged at a feed inlet at the tail of the injection molding material pipe (1), an injection molding screw (11) is rotatably connected with the inner wall of the injection molding material pipe (1), and an injection screw head (12) is arranged at one end, close to the injection nozzle (2), of the injection molding screw (11);

The raw material treatment device (4) comprises a positioning frame (41), a fixed support (42) is fixedly arranged at the top of the positioning frame (41), a raw material guide mechanism (43) is arranged on the inner wall of the fixed support (42), a raw material treatment mechanism (44) is arranged at the top of the fixed support (42), and the raw material treatment mechanism (44) is located in an inner cavity of the raw material guide mechanism (43).

2. An injection mechanism of a model injection molding machine as claimed in claim 1, wherein: the raw material guiding mechanism (43) comprises a top hopper (4301), a guiding hopper (4302) is fixedly arranged at the bottom of the top hopper (4301), and the guiding hopper (4302) is connected with the raw material processing mechanism (44) through a bearing (4303).

3. An injection mechanism of a model injection molding machine as claimed in claim 2, wherein: the top hopper (4301) is V-shaped, and the inner cavity of the guide hopper (4302) is Y-shaped.

4. An injection mechanism of a model injection molding machine as claimed in claim 2, wherein: the bottom of direction hopper (4302) is provided with right hopper (4304) and left hopper (4305), right hopper (4304) and left hopper (4305) pass through connecting rod (4306) swing joint, connecting rod (4306) fixed mounting is on positioning frame (41), right hopper (4304) and left hopper (4305) are fixed mutually through bolt (4307).

5. An injection mechanism of a model injection molding machine as claimed in claim 2, wherein: the raw material treatment mechanism (44) comprises a hollow motor (4401), a connecting shaft (4402) is fixedly sleeved on a power output shaft of the hollow motor (4401), a scattering blade (4403) is fixedly arranged on the outer wall of the connecting shaft (4402), and the scattering blade (4403) corresponds to a discharging opening of the guide hopper (4302).

6. An injection mechanism of a model injection molding machine as claimed in claim 5, wherein: the outer wall of connecting axle (4402) is fixed and is equipped with linking bridge (4404), the outer edge fixed mounting of linking bridge (4404) has bracket (4405), the top joint of bracket (4405) has guide ring (4407), the top of guide ring (4407) is located under guide hopper (4302) feed opening.

7. An injection mechanism of a model injection molding machine as claimed in claim 6, wherein: the shape of the guide ring (4407) is reverse V-shaped, a plurality of protruding blocks (4409) are fixedly assembled on the outer wall of the guide ring (4407), and the protruding blocks (4409) are uniformly distributed.

8. An injection mechanism of a model injection molding machine as claimed in claim 6, wherein: the inner wall of the guide ring (4407) is fixedly provided with a cylinder (4408), the outer wall of the bracket (4405) is provided with a Z-shaped groove (4406), and the Z-shaped groove (4406) and the cylinder (4408) are respectively provided with four.

9. An injection mechanism of a model injection molding machine as claimed in claim 5, wherein: the outer wall of connecting axle (4402) is installed and is inhaled miscellaneous pipeline (4410), the miscellaneous pipeline (4410) of miscellaneous pipeline (4402) are linked together with connecting axle (4402), a plurality of through-hole (4411) have been seted up to the outer wall of miscellaneous pipeline (4410), the miscellaneous pipeline (4410) of miscellaneous pipeline is located under guide ring (4407).

10. An injection mechanism of a model injection molding machine as claimed in claim 5, wherein: the output shaft at cavity motor (4401) top is installed rotary joint (4416), the outer wall of rotary joint (4416) is fixed and is equipped with support frame (4415), the top of rotary joint (4416) is installed and is inhaled miscellaneous connecting pipe (4417), the bottom of connecting axle (4402) is fixed and is equipped with bottom pivot (4412), the outer wall of bottom pivot (4412) is fixed and is equipped with stirring leaf (4413), the bottom of connecting axle (4402) is fixed and is equipped with helical blade (4414).