CN115534248A

CN115534248A - Injection molding machine

Info

Publication number: CN115534248A
Application number: CN202211164022.2A
Authority: CN
Inventors: 陈明华
Original assignee: Gienkee Plas Science & Technology (suzhou) Co ltd
Current assignee: Gienkee Plas Science & Technology (suzhou) Co ltd
Priority date: 2022-09-23
Filing date: 2022-09-23
Publication date: 2022-12-30
Also published as: WO2024060770A1

Abstract

The invention relates to an injection molding machine, which comprises a machine base, a rubber injection cylinder, a rubber injection screw, a pressure sensor and a power device, wherein the power device comprises a power screw rod, a power screw sleeve, a power shaft, a feeding power mechanism, an injection power mechanism and an injection auxiliary mechanism. On one hand, the power provided by the ejection auxiliary mechanism is used for increasing the ejection power so as to reduce the power specification of the ejection power mechanism; on the other hand, through the matching of the feeding power mechanism, the ejection power mechanism and the ejection auxiliary mechanism and the braking or releasing of the braking part, not only the energy storage in the feeding process can be carried out, but also the power specification of the feeding power mechanism is reduced, so that the power specification of the ejection and the feeding is reduced; and the switch between the straight line and the rotation is convenient.

Description

Injection molding machine

Technical Field

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

Background

At present, an injection device of an injection molding machine mainly realizes four actions:

and (3) injection: the injection motor drives the rotary screw rod to push the injection screw rod to advance;

and (3) pressure maintaining: keeping the pressure intensity of the die cavity and the material pipe unchanged for a period of time, and continuously applying work by the injection motor;

feeding: the feeding motor drives the glue injection screw to rotate (the glue injection screw can only rotate in one direction);

loosening after loosening: the pressure of penetrating the gluey screw rod anterior segment can be bigger and bigger to produce the backpressure when the reinforced motor drives to penetrate gluey screw rod rotatory, at this moment need the power lead screw to move backward and release the backpressure, reinforced motor and the simultaneous working of ejection motor this moment.

However, in most injection molding machines, the injection shaft and the feeding shaft are respectively controlled by one servo motor, and the injection motor drives the power screw rod to rotate through the injection belt to push the injection screw rod to move forwards and backwards; during feeding, the feeding motor drives the injection screw to rotate, and thus, a servo motor is needed for injection and feeding (the injection servo motor is larger than the feeding servo motor in general conditions), and in the whole injection process, the injection and feeding do not work simultaneously with the maximum torque force (that is to say, when the output power of the injection motor is maximum, the feeding motor does not work simultaneously with the maximum output, and vice versa), so that the utilization efficiency of the motor is relatively low, therefore, not only the matching of the servo motor increases the manufacturing cost of the injection molding machine, but also the utilization rate of the servo motor is low, and the injection molding cost is high.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide an improved injection molding machine.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows:

an injection molding machine, comprising:

a machine base;

the glue injection cylinder comprises a glue injection cylinder body and a glue injection nozzle, wherein a material cavity is formed in the glue injection cylinder body;

the glue injection screw rod extends along the length direction of the glue injection cylinder and extends into the base from the rear end part;

a pressure sensor;

the power device is used for driving the glue injection screw to rotate around the axis of the power device or/and move linearly along the length direction of the power device, and particularly comprises a power screw rod, a power screw sleeve, a power shaft, a feeding power mechanism, an injection power mechanism and an injection auxiliary mechanism, wherein the power screw rod is concentric with the glue injection screw rod, and the spiral direction of the power screw rod is opposite to the spiral direction of the glue injection screw rod; the power screw sleeve is in threaded fit with the power screw rod; the power shaft is used for coaxially connecting the power screw sleeve with the glue injection screw rod and can rotate around the axis of the power shaft or move along the direction of the axis of the power shaft, wherein the front end part of the power shaft is connected with the rear end part of the glue injection screw rod, the rear end part of the power shaft is relatively and rotatably connected with the front end part of the power screw sleeve, and a connecting hole matched with the front end part of the power screw rod is formed in the power shaft; the feeding power mechanism comprises a feeding power piece and a braking piece, wherein the feeding power piece drives the power shaft to rotate around the axis of the feeding power piece; the ejection power mechanism is used for driving the power screw rod to rotate around the axis of the power screw rod; the injection auxiliary mechanism comprises a plurality of auxiliary oil cylinders, an energy accumulator and a control valve which are uniformly distributed at intervals in the circumferential direction around the power screw rod and are arranged in parallel with the power screw rod, wherein the plurality of auxiliary oil cylinders stretch out and draw back synchronously and can move synchronously with the power screw sleeve; during pressure maintaining, the ejection power mechanism and the auxiliary oil cylinder exert force together to maintain set pressure; when feeding, the ejection power mechanism drives the power screw rod to rotate reversely, and the feeding power part drives the power shaft to rotate and cooperate, so that the power screw rod and the power screw sleeve rotate in situ to feed.

Preferably, when feeding, the rotating speed of the power screw rod is N1, the rotating speed of the power shaft is N2, and when N1= N2, the power screw rod and the power screw sleeve rotate in situ to feed; when N1 is larger than N2, the power screw sleeve retreats, and the auxiliary oil cylinder compresses and stores energy. In the process, the power screw rod and the power screw sleeve rotate in situ to feed materials or the auxiliary oil cylinder compresses to store energy and feed materials downwards by controlling the rotating speeds N1 and N2.

According to a particular embodiment and preferred aspect of the invention, the control valve disconnects the accumulator from the slave cylinder before the next injection event begins; and/or the control valve is an electromagnetic two-way stop valve. Under the control of the oil passage of the electromagnetic two-way stop valve, the auxiliary force provided by the auxiliary oil cylinder can be implemented.

According to another specific implementation and preferable aspect of the invention, the power screw sleeve is in transmission connection with the power shaft through a bearing, a lubricating oil storage cavity is formed inside the machine base, and the bearing is immersed in the lubricating oil storage cavity; and/or the bearing is a needle bearing. On one hand, lubrication of the needle bearing is ensured through an oil immersion mode; on the other hand, the motion synchronism of the power screw sleeve and the power shaft can be improved.

Preferably, a bearing cover plate is formed on the periphery of the needle bearing, an ejection transmission seat capable of avoiding the motion of the power screw rod is arranged on the periphery of the power screw rod, and the auxiliary oil cylinders are located between the bearing cover plate and the ejection transmission seat.

Furthermore, a thread matching hole is formed in the power thread insert, wherein the hole diameters of the thread matching hole and the connecting hole are equal, and the centers of the thread matching hole and the connecting hole are aligned. The front end of the power screw rod can be conveniently and relatively extended into the power screw rod, the size of the equipment is shortened, and meanwhile, the outer diameter of the power screw rod is kept equal.

According to another embodiment and preferred aspect of the present invention, the back-release or anti-delay is provided, the brake is in braking, and the injection power mechanism drives the power screw to rotate to retract the screw nut against the force of the auxiliary cylinder.

According to still another embodiment and a preferred aspect of the present invention, the feeding power member includes a feeding belt wheel with an aligned axis and disposed on the periphery of the power shaft, a feeding motor with an output shaft parallel to the glue injection screw, and a feeding transmission member for driving and connecting the output shaft of the feeding motor and the feeding belt wheel, wherein the braking member is disposed on the output shaft and is capable of braking the rotation of the feeding belt wheel, the power shaft and the feeding belt wheel are capable of rotating synchronously, and the power shaft is further capable of moving along its own length direction relative to the feeding belt wheel.

Preferably, a key groove extending along the length direction of the glue injection screw is formed on the feeding belt wheel, and a transmission key matched with the key groove is fixedly formed on the power shaft; and/or the key groove and the transmission key form a key groove group, and the feeding power part comprises a plurality of key groove groups which are uniformly distributed at intervals around the circumferential direction of the power shaft. The arrangement of a plurality of key slot groups ensures the synchronous precision of the power shaft and the driving shaft, and can form spacing during linear motion, thereby further reducing the possibility of rotation in the linear motion of the glue injection screw.

In addition, the power screw rod, the power shaft and the power screw sleeve form a ball screw rod assembly, and the ball screw rod assembly can be positioned in the base in an oil-immersed lubrication mode; and/or the rear end of the power screw rod penetrates out of the rear end of the base, and the ejection power mechanism comprises an ejection belt wheel fixed at the rear end part of the power screw rod, an ejection motor positioned at the bottom of the base and an ejection transmission part used for driving and connecting the ejection motor and the ejection belt wheel.

In conclusion, the injection molding machine has the following injection molding working states:

and (3) injection: the ejection motor and the energy accumulator supply oil to the ejection auxiliary oil cylinder, at the moment, the jaw brake brakes, and under the cooperation of the key groove matching part, the ejection motor drives the power screw rod clockwise to rotate clockwise, so that the advancing of the power screw sleeve and the power shaft (namely the advancing of the injection screw rod) is realized.

And (3) pressure maintaining: the ejection motor and the auxiliary oil cylinder jointly output force to maintain certain pressure.

Feeding:

state 1: the ejection motor drives the power screw rod to rotate anticlockwise at a rotating speed of N1, the feeding motor drives the power shaft to rotate at a rotating speed of N2, N1= N2, and the screw rod and the power screw sleeve rotate in situ for feeding;

state 2: when the feeding in the state 1 reaches a certain stage, generating back pressure, increasing the rotating speed N1 of the power screw rod to be more than N2, retreating the power screw sleeve, and ejecting the auxiliary oil cylinder to compress and store energy;

and the energy storage of the compression of the charging and ejecting auxiliary oil cylinder is realized by repeating the state 1 and the state 2.

After loosening (tape casting): the jaw brake brakes, the injection motor rotates anticlockwise, and the power threaded sleeve is retracted by overcoming the force of the injection auxiliary oil cylinder;

before the next injection action is started, the energy accumulator and the injection auxiliary oil cylinder are disconnected.

When the hydraulic accumulator is used for injection, the acceleration is faster, and the overall injection performance is improved; during pressure maintaining, one part of force can be continuously provided, the output of the injection motor is reduced, and the control effect of pressure maintaining is improved; after the hydraulic valve in the hydraulic oil circuit is closed, the position of the injection motor can be kept unchanged, so that the injection motor does not need to be kept unchanged (or the motor does not need to be braked) when waiting for injection.

As for the factors of the reduction of the specification of the injection motor: the accumulator provides part of the power. Factors that reduce the feed motor specification: the force source for the feed is provided by both the injection motor and the feed motor. In the simultaneous operation of the injection motor and the feed motor, two operating conditions must be met: 1. the thread directions of the glue injection screw and the power screw rod need to be opposite; 2. use of a dog brake.

Due to the implementation of the technical scheme, compared with the prior art, the invention has the following advantages:

on one hand, the power provided by the ejection auxiliary mechanism is used for increasing the ejection power so as to reduce the power specification of the ejection power mechanism; on the other hand, through the matching of the feeding power mechanism, the ejection power mechanism and the ejection auxiliary mechanism and the braking or releasing of the braking part, not only the energy storage in the feeding process can be carried out, but also the power specification of the feeding power mechanism is reduced, so that the power specification of the ejection and the feeding is reduced; and the switching between the straight line and the rotation is convenient.

Drawings

FIG. 1 is a schematic structural view of an injection molding machine of the present invention;

FIG. 2 is a schematic front view of FIG. 1;

FIG. 3 is a right-side schematic view of FIG. 2;

FIG. 4 is a schematic top view of FIG. 1;

FIG. 5 is an enlarged cross-sectional view taken along line A-A in FIG. 4 (with the nozzle omitted);

FIG. 6 is a partial schematic illustration of the structure of FIG. 1;

FIG. 7 is a front view of FIG. 6;

FIG. 8 is an exploded view of FIG. 1;

FIG. 9 is an exploded view of the portion of FIG. 8;

FIG. 10 is a schematic view of the operation of the ejection assisting mechanism of FIG. 1;

wherein: 1. a machine base; 10. a rear seat body; 11. a front seat body;

2. injecting a rubber cylinder; 20. injecting a glue barrel; 21. a glue injection nozzle; 20a, a plastic material inlet;

3. injecting a glue screw;

4. a pressure sensor;

D. a power plant; 5. a power screw rod; 6. a power screw sleeve; 7. a power shaft; g. a needle bearing; b. a bearing cover plate; 8. a feeding power mechanism; 80. a feeding power part; 800. a feeding belt wheel; 801. a charging motor; 802. a feeding transmission part; 802a, transmission gear; c1, a key groove; c2, a transmission key: C. a key slot group; 81. a stopper; 9. an ejection power mechanism; 90. an ejection pulley; 91. an injection motor; 92. ejecting the transmission member; 920. ejecting a synchronous pulley; 921. a synchronous belt; h. an anti-skid wheel groove; s, an ejection auxiliary mechanism; s1, an injection transmission seat; s2, an auxiliary oil cylinder; and s3, an energy accumulator.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and that modifications may be made by one skilled in the art without departing from the spirit and scope of the application and it is therefore not intended to be limited to the specific embodiments disclosed below.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and encompass, for example, both fixed and removable connections or integral parts thereof; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be interconnected within two elements or in a relationship where two elements interact with each other unless otherwise specifically limited. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature "under," "beneath," and "under" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

As shown in fig. 1 to 7, the injection molding machine of the present embodiment includes a machine base 1, a glue injection cylinder 2, a glue injection screw 3, a pressure sensor 4, and a power device D.

Specifically, the engine base 1 includes a rear seat body 10 forming a seat cavity, and a front seat body 11 detachably mounted on a front end portion of the rear seat body 10.

The rubber injection cylinder 2 is fixed on the front seat body 11 from the rear end.

Specifically, the glue injection cylinder 2 comprises a glue injection cylinder 20 with a material cavity formed therein and a glue injection nozzle 21 arranged at the front end of the glue injection cylinder 20, wherein the glue injection cylinder 20 is provided with a plastic material inlet 20a.

The injection screw 3 extends along the length direction of the injection cylinder 2 and extends into the front seat body 11 from the rear end part.

The pressure sensor 4 is disposed in the rear seat body 10.

And the power device D is used for driving the injection screw rod 3 to rotate around the axis of the injection screw rod or/and to linearly move along the length direction of the injection screw rod.

As shown in fig. 8 and 9, the power device D includes a power screw 5, a power screw 6, a power shaft 7, a feeding power mechanism 8, an injection power mechanism 9, and an injection auxiliary mechanism S.

The power screw rod 5 is concentric with the glue injection screw rod 3, and the spiral direction is opposite to the spiral direction of the glue injection screw rod 3. In this way, a better co-operative joint movement between the charging power means 8 and the ejection power means 9 is obtained, reducing the choice of power specifications.

And a thread matching hole is formed in the power screw sleeve 6, wherein the thread matching hole is matched with the external thread of the power screw rod 5.

The power shaft 7 is used for coaxially connecting the power threaded sleeve 6 with the glue injection screw rod 3 and can rotate around the axis of the power shaft or move along the direction of the axis of the power shaft, wherein the front end part of the power shaft 7 is connected with the rear end part of the glue injection screw rod 3, and the rear end part of the power shaft 7 is relatively and rotatably connected with the front end part of the power threaded sleeve 6.

The power shaft 7 is internally provided with a connecting hole matched with the front end part of the power screw rod 5, wherein the diameters of the threaded matching hole and the connecting hole are equal, and the centers of the threaded matching hole and the connecting hole are aligned. Therefore, the front end of the power screw rod can be conveniently and relatively extended, the size of the equipment is shortened, and the outer diameter of the power screw rod is kept equal.

The power screw sleeve 6 and the power shaft 7 are in transmission connection through a needle bearing g. Thus, the motion synchronism of the power screw 6 and the power shaft 7 is improved by the thrust of the needle bearing.

The needle bearing g is lubricated in an oil immersion mode, and a bearing cover plate b is formed on the periphery of the needle bearing g.

As shown in fig. 10, the ejection assisting mechanism S includes an ejection transmission seat S1 sleeved on the periphery of the power screw 5, an auxiliary cylinder S2 parallel to the power screw 5 and having two ends respectively connected between the bearing cover plate b and the ejection transmission seat S1, an energy accumulator S3 for controlling the expansion amount of the auxiliary cylinder S2, and a control valve S4 disposed between the energy accumulator S3 and the auxiliary cylinder S2, wherein the number of the auxiliary cylinders S2 is two, and the two auxiliary cylinders are uniformly distributed around the power screw 5 in the circumferential direction.

In this embodiment, the two auxiliary cylinders s2 are symmetrically arranged on both sides of the power screw rod 5 and are synchronously telescopic, and the two auxiliary cylinders s2 can also be synchronously arranged in the seat cavity with the power screw sleeve 6.

The control valve s4 is an electromagnetic two-way cut-off valve, and can apply the assist force provided by the assist cylinder under the control of the oil passage of the electromagnetic two-way cut-off valve.

In this example, the control valve s4 disconnects the accumulator s3 from the slave cylinder s2 before the next injection operation is started.

The charging power mechanism 8 comprises a charging power member 80 and a braking member 81 for driving the power shaft 7 to rotate around the axis thereof.

Specifically, the feeding power part 80 includes a feeding belt wheel 800 with an aligned axis and sleeved on the periphery of the power shaft 7, a feeding motor 801 with an output shaft parallel to the glue injection screw 3, and a feeding transmission member 802 for driving and connecting the output shaft of the feeding motor 801 and the feeding belt wheel 800.

The feeding belt wheel 80 is formed with a key groove C1 extending along the length direction of the injection screw 3, and the power shaft 7 is fixedly formed with a driving key C2 matching with the key groove C1, wherein the key groove C1 and the driving key C2 form a key groove group C (i.e. a conventional key groove fit).

The charging power member 80 comprises two spline sets C and is evenly spaced circumferentially around the power shaft 7. The two key groove groups C are arranged, so that the synchronous precision of the power shaft 7 and the driving shaft is ensured, the limit can be formed during linear motion, and the possibility of rotation in the linear motion of the glue injection screw is further reduced.

In this example, the feed pulley 80 is a gear and the feed drive 802 includes a drive gear 802a disposed on the output shaft and engaged with the gear. And a gear meshing mode is adopted, so that the slipping of the belt wheel is avoided, and the high-precision control of the movement is ensured.

The braking member 81 is a dog brake, and the dog brake is provided on the output shaft.

The rear end of the power screw rod 5 penetrates out of the rear end of the rear seat body 10.

The injection power mechanism 9 includes an injection pulley 90 fixed to the rear end of the power screw 5, an injection motor 91 located at the bottom of the rear seat body 10, and an injection transmission member 92 for drivingly connecting the injection motor 91 and the injection pulley 90.

Specifically, the injection transmission member 92 includes an injection timing pulley 920 provided on an output shaft of the injection motor 91, and a timing belt 921 for synchronously connecting the injection pulley 90 and the injection timing pulley 920.

In this example, the injection timing pulley 920 and the injection pulley 90 are provided with anti-slip grooves h on the outer peripheries thereof.

Meanwhile, the power screw rod 5, the power screw sleeve 6 and the power shaft 7 form a ball screw assembly. Therefore, the rotation of the power screw rod can be accurately implemented, and the motion output of the power screw sleeve and the power shaft correlation glue screw rod can be more stably completed.

In this case, the ball screw assembly and the bearing can be lubricated in an oil immersion mode, so that the service life of the ball screw assembly is prolonged.

In conclusion, the injection molding machine of the application has the following injection molding working states:

Pressure maintaining: the ejection motor and the auxiliary oil cylinder jointly output force to maintain certain pressure.

Feeding:

state 1: the injection motor drives the power screw rod to rotate anticlockwise at a rotating speed of N1, the feeding motor drives the power shaft to rotate at a rotating speed of N2, N1= N2, and the screw rod and the power screw sleeve rotate in situ for feeding;

state 2: when the state 1 is fed to a certain stage, back pressure is generated, the rotating speed N1 of the power screw rod is increased to be more than N2, the power screw sleeve retreats, and the ejection auxiliary oil cylinder compresses and stores energy;

and the state 1 and the state 2 are repeated to realize the energy storage of the compression of the charging and ejecting auxiliary oil cylinder.

After loosening (tape casting): the jaw brake brakes, the ejection motor rotates anticlockwise, and the power screw sleeve is retracted by overcoming the force of the ejection auxiliary oil cylinder.

Meanwhile, before the next ejection action is started, the energy accumulator and the ejection auxiliary oil cylinder are disconnected.

Therefore, the injection molding machine of the embodiment has the following advantages:

1) On one hand, the power provided by the ejection auxiliary mechanism is used for increasing the ejection power so as to reduce the power specification of the ejection power mechanism; on the other hand, through the matching of the feeding power mechanism, the ejection power mechanism and the ejection auxiliary mechanism and the braking or releasing of the braking part, not only the energy storage in the feeding process can be carried out, but also the power specification of the feeding power mechanism is reduced, so that the power specification of the ejection and the feeding is reduced; the switching between the straight line and the rotation is convenient;

2) The power shaft and the power screw sleeve are relatively connected in a rotating mode through the needle bearing, and the motion synchronism of the power screw sleeve and the power shaft is improved through the axial thrust of the needle bearing; meanwhile, the spiral direction of the glue injection screw is opposite to that of the power screw rod, and the axial movement and the circumferential rotation of the power shaft are convenient to switch under the matching of the jaw brake and the key groove matching part so as to implement the injection and feeding actions of the glue injection screw rod;

3) The specifications of the feeding motor and the ejection motor are reduced, and the corresponding driving specifications are also reduced, so that the motor matching requirement is greatly reduced, and the manufacturing cost and the use cost are reduced.

The present invention has been described in detail in order to enable those skilled in the art to understand the invention and to practice it, and it is not intended to limit the scope of the invention, and all equivalent changes and modifications made according to the spirit of the present invention should be covered by the present invention.

Claims

1. An injection molding machine, comprising:

a machine base;

a pressure sensor;

the power device is used for driving the glue injection screw to rotate around the axis of the power device or/and move linearly along the length direction of the power device, and is characterized by comprising a power screw rod, a power screw sleeve, a power shaft, a feeding power mechanism, an ejection power mechanism and an ejection auxiliary mechanism, wherein the power screw rod is concentric with the glue injection screw rod, and the spiral direction of the power screw rod is opposite to the spiral direction of the glue injection screw rod; the power screw sleeve is in threaded fit with the power screw rod; the power shaft is used for coaxially connecting the power screw sleeve and the glue injection screw rod and can rotate around the axis of the power shaft or move along the direction of the axis of the power shaft, the front end part of the power shaft is connected with the rear end part of the glue injection screw rod, the rear end part of the power shaft is relatively and rotatably connected with the front end part of the power screw sleeve, and a connecting hole matched with the front end part of the power screw rod is formed in the power shaft; the feeding power mechanism comprises a feeding power piece and a braking piece, wherein the feeding power piece drives the power shaft to rotate around the axis of the power shaft, and the braking piece can brake the power piece to limit the rotation of the power shaft; the ejection power mechanism is used for driving the power screw rod to rotate around the axis of the power screw rod; the injection auxiliary mechanism comprises a plurality of auxiliary oil cylinders, an energy accumulator and a control valve which are uniformly distributed around the power screw rod at intervals in the circumferential direction and are arranged in parallel with the power screw rod, wherein the plurality of auxiliary oil cylinders stretch out and draw back synchronously and can move synchronously with the power screw sleeve; during pressure maintaining, the ejection power mechanism and the auxiliary oil cylinder exert force together to maintain set pressure; when feeding, the ejection power mechanism drives the power screw rod to rotate reversely, and the feeding power part drives the power shaft to rotate and cooperate, so that the power screw rod and the power screw sleeve rotate in situ to feed.

2. An injection molding machine according to claim 1, wherein: when feeding, the rotating speed of the power screw rod is N1, the rotating speed of the power shaft is N2, wherein when N1= N2, the power screw rod and the power screw sleeve rotate in situ to feed materials; when N1 is larger than N2, the power screw sleeve retreats, and the auxiliary oil cylinder compresses and stores energy.

3. An injection molding machine according to claim 1, wherein: before the next injection action is started, the control valve disconnects the accumulator from the auxiliary oil cylinder; and/or the control valve is an electromagnetic two-way stop valve.

4. An injection molding machine according to claim 1, wherein: the power threaded sleeve is in transmission connection with the power shaft through a bearing, a lubricating oil storage cavity is formed in the base, and the bearing is immersed in the lubricating oil storage cavity; and/or the bearing is a needle bearing.

5. An injection molding machine according to claim 4, wherein: and a bearing cover plate is formed at the periphery of the needle bearing, an ejection transmission seat capable of avoiding the motion of the power screw rod is arranged at the periphery of the power screw rod, and the auxiliary oil cylinders are positioned between the bearing cover plate and the ejection transmission seat.

6. An injection molding machine according to claim 1, wherein: and a thread matching hole is formed in the power thread insert, wherein the diameters of the thread matching hole and the connecting hole are equal, and the centers of the thread matching hole and the connecting hole are aligned.

7. An injection molding machine according to claim 1, wherein: and after loosening or anti-flow delay, the braking part is in braking, and the ejecting power mechanism drives the power screw rod to rotate so as to overcome the acting force of the auxiliary oil cylinder and enable the screw rod screw cap to retreat.

8. An injection molding machine according to any one of claims 1 to 7, wherein: reinforced power spare includes the cover that the axle center aligns and establishes reinforced band pulley, the output shaft of power axle periphery with penetrate the parallel reinforced motor of gluey screw rod, incite somebody to action the output shaft of reinforced motor with reinforced driving medium that band pulley looks transmission is connected, the braking piece sets up just can brake on the output shaft the rotation of reinforced band pulley, the power axle with reinforced band pulley can synchronous revolution, just the power axle can also be relative along self length direction reinforced band pulley removes.

9. An injection molding machine according to claim 8, wherein: a key groove extending along the length direction of the glue injection screw is formed on the feeding belt wheel, and a transmission key matched with the key groove is fixedly formed on the power shaft; and/or the key grooves and the transmission keys form key groove groups, and the charging power part comprises a plurality of key groove groups which are uniformly distributed at intervals in the circumferential direction around the power shaft.

10. An injection molding machine according to claim 1, wherein: the power screw rod, the power shaft and the power screw sleeve form a ball screw assembly, and the ball screw assembly can be positioned in the base in an oil-immersed lubrication mode; and/or the rear end of the power screw rod penetrates out of the rear end of the base, and the ejection power mechanism comprises an ejection belt wheel fixed at the rear end part of the power screw rod, an ejection motor positioned at the bottom of the base and an ejection transmission part used for connecting the ejection motor with the ejection belt wheel in a transmission manner.