CN218857618U - Axial excitation device and injection molding machine - Google Patents

Abstract

The utility model discloses an axial excitation device and injection molding machine, its axial excitation device include the rod cover subassembly, with rod cover subassembly sliding connection and at the axial vibration ring that forms first cavity and second cavity of injection screw rod, respectively with the gas/oil circuit regulating unit of first cavity and second cavity intercommunication, use compressed gas or hydraulic power drive, wherein first, another pressure release of a pressurization in the two cavities, the vibration ring is along with first, the internal pressure variation of cavity and along injection screw rod axial reciprocating motion. The utility model discloses a screw rod adds the scheme that shakes to combine the change of cavity internal pressure to make the injection screw rod form reciprocating vibration in the axial, and the vibration directly reaches the raw materials, change the characteristic of melting raw materials in injection, pressurize and the storage flow, reduce the energy consumption when obviously improving injection molding's physical properties and outward appearance quality and promote production efficiency, simple structure in addition, it is with low costs, great popularization and use value have.

Description

Axial excitation device and injection molding machine

Technical Field

The utility model belongs to the technical field of mould plastics, concretely relates to axial excitation device still relates to an injection molding machine with axial excitation device simultaneously.

Background

As is well known, injection molding techniques are primarily the process of injecting thermoplastic into various molds using an injection molding machine to form plastic articles. The basic flow is that the injection moulding machine heats and rotates the plastic particles to cut and melt by the screw and then stores the melted plastic in the charging barrel, and then applies high pressure to the melted plastic to inject and fill the mold cavity (called mold cavity for short).

The main actions of injection molding are as follows:

and (3) injection: or injection, pushing an injection screw to inject molten plastic into a mold cavity.

Pressure maintaining: after the screw injects the molten plastic into the mold cavity, the injection molding machine continues the process of maintaining the pressure within the mold cavity.

Storing materials: or called charging, plastic particles are drawn into the charging barrel by rotating the injection screw. After entering the charging barrel, the particles are sheared, melted and flow to the front end of the screw by the high-temperature charging barrel and the screw, and meanwhile, in order to keep the pressure of the molten plastic at the front end of the screw, the injection screw moves backwards along with the added raw materials.

However, the final purpose of injection molding is to obtain a good quality product, and the main causes of molding defects of injection molded products can be classified into two categories: one is the defect caused by the fluidity at the filling stage, and the other is the defect caused by the pressure-holding cooling process. Defects caused by fluidity comprise material shortage, surface flow marks, welding seams and the like; the defects caused by the pressure maintaining cooling include dimensional deviation, flash, warping deformation, stress residue and the like.

Dynamic injection molding, in the process of injection molding processing, an injection screw is made to generate axial vibration, an additional stress is superposed on the main shear flow direction of the plastic, and the molten plastic is made to complete the process of physical and chemical changes under the action of the combined stress. The effect of vibration on the polymer shaped article is mainly exerted by the processes of the transition of the condensed state and the crystallization kinetics of the polymer. The main functions of the medicine are as follows:

1) The filling performance of the product is improved, the shrinkage and bending of the product can be effectively prevented, and the yield strength is improved;

2) The injection pressure is reduced, the orientation of molecules is effectively promoted by periodic vibration, the fluidity is improved, the filling pressure is reduced, the multi-cavity pressure is balanced, the exhaust performance of the mold is improved, and the molding requirement is met by relatively low pressure;

3) The energy consumption of storing materials is reduced, after vibration is applied to molten plastics, the flowing state of the molten materials is changed, the viscosity is reduced, the rotating torsion of the screw is reduced, and the energy consumption is saved.

However, in dynamic injection molding, the modes of applying mechanical vibration include mold vibration molding, screw vibration molding, single-point dynamic feeding pressure maintaining molding, multi-point dynamic feeding pressure maintaining molding, push-pull injection molding, etc., the basic principle is to introduce vibration to the injection process to optimize the molding process, and the main scheme is to use the driving injection screw to realize screw vibration, or to add a plunger device at the position of the mold gate, or to use the mold with a push-pull mold cavity, etc.

And (3) mould vibration: the method comprises single-point dynamic feeding pressure-maintaining molding and multipoint dynamic feeding pressure-maintaining molding. The principle is that the mould is provided with two hydraulically driven pressure maintaining pistons communicated with the cavity, and the two pistons are driven by independent hydraulic systems and have a phase difference of 180 degrees. After filling, the two pistons move alternately, so that the molten plastic communicated with the pistons is sheared in the solidification process, and the filling machine has the advantages of good forming performance and the disadvantages that a mould needs to be specially made and needs additional hydraulic power.

And (3) vibration of the screw: the screw is vibrated by an oil cylinder or a high dynamic servo motor, and the vibration is directly transmitted to the raw material.

Push-pull injection molding: the injection molding machine comprises a double-gate mold and an auxiliary injection unit, wherein a main injection unit of the injection molding machine injects raw materials into the mold through one gate and overfills a mold cavity, redundant raw materials flow into the auxiliary injection unit through the other gate, a screw of the auxiliary injection unit retreats to accommodate the redundant raw materials, then the auxiliary injection unit injects the raw materials into the mold cavity again, and the screw of the main injection unit retreats and reciprocates; the melted raw materials are pushed and pulled back and forth by the two sets of screw rods in the die cavity to form a shearing effect. The scheme has the advantages of good molding performance and the defect that both a mold and a machine need to be specially made.

Therefore, the molding auxiliary devices all have the problems of high price or complex device, and have great limitation on the popularization and the use of the dynamic injection molding technology.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that overcome prior art not enough, provide a brand-new axial excitation device.

Simultaneously the utility model discloses still relate to an injection molding machine with axial excitation device.

For solving the technical problem, the utility model discloses a following technical scheme: an axial excitation device is driven by compressed gas or hydraulic power, is arranged at the tail end of an injection screw far away from an ejection end, and comprises a rod sleeve assembly, a vibration ring and an air/oil path adjusting unit, wherein the rod sleeve assembly is sleeved on the injection screw in a heat insulation and relative rotation manner, the vibration ring is connected with the rod sleeve assembly in a sliding manner and forms a first cavity and a second cavity in the axial direction of the injection screw, the air/oil path adjusting unit is respectively communicated with the first cavity and the second cavity, one of the first cavity and the second cavity is pressurized, the other one of the first cavity and the second cavity is decompressed, the vibration ring reciprocates in the axial direction of the injection screw along with the change of the internal pressure of the first cavity and the second cavity, and the rod sleeve assembly and the injection screw form reciprocating vibration displacement of 0.05 to 0.15mm in the axial direction.

Preferably, the axial lines of the injection screw, the rod sleeve component and the vibrating ring are superposed. The resulting movement is more smooth.

According to the utility model discloses a concrete implementation and preferred aspect, the rod cover subassembly includes to overlap tight cover, thermal-insulated sleeve, bearing, the axle sleeve seat that rises that establishes in proper order from inside to outside, and wherein the vibration ring slides and sets up on the axle sleeve seat, and axle sleeve seat, vibration ring can not rotate along with the rotation of injection screw. The requirements of heat insulation and relative rotation are met, and when the injection screw rotates, the part fixed on the shaft sleeve seat cannot rotate along with the injection screw.

Preferably, the bearing is a thrust ball bearing; and/or the thrust ball bearing comprises a bearing inner ring, a steel ball retainer, a steel ball arranged in the steel ball retainer, a bearing cover provided with a seat ring and a bearing seat, wherein the bearing inner ring, the steel ball retainer and the bearing seat are axially assembled, and the shaft sleeve seat is arranged on the periphery of the bearing seat.

Further, the shaft sleeve seat comprises a sleeve body, an inner ring plate positioned in the sleeve body and an outer ring plate positioned on the periphery of the sleeve body, wherein the inner ring plate is arranged on the periphery of the bearing seat and is abutted against the bearing cover; the outer ring plate is a partition plate and divides the ring cavity of the vibration ring into a first cavity and a second cavity.

According to another embodiment and preferred aspect of the present invention, the gas/oil path adjusting unit includes a first gas nozzle/oil nozzle and a second gas nozzle/oil nozzle respectively connected to the first cavity and the second cavity, a first gas/oil path and a second gas/oil path respectively connected to the first gas nozzle/oil nozzle and the second gas nozzle/oil nozzle, a first solenoid valve and a second solenoid valve disposed on the first gas/oil path and the second gas/oil path, wherein under the control of the first solenoid valve and the second solenoid valve, one of the first gas/oil path and the second gas/oil path is pressurized and the other is depressurized. The reciprocating motion of the vibrating ring is driven by the change of air pressure/oil pressure to form vibration.

Preferably, the displacement of the oscillating ring reciprocating along the axis is 20 ± 5mm; and/or the frequency of the reciprocating motion of the vibration ring along the axis is 5 to 15Hz.

Furthermore, a first displacement sensor and a second displacement sensor are arranged at two axial ends of the vibration ring, wherein the first displacement sensor and the second displacement sensor synchronously move along with the vibration ring and monitor displacement in real time.

Preferably, the vibration ring comprises a first ring sheet, a counterweight ring and a second ring sheet which are sequentially distributed along the axial direction and internally form a ring cavity, wherein the ring cavity is sealed in a self-lubricating manner with the rod sleeve component and is separated into a first cavity and a second cavity.

The utility model discloses another technical scheme is: an injection molding machine comprises a charging barrel and an injection screw, wherein the front end part of the injection screw is an injection end, the tail end of the injection screw is a power connection end, and particularly, the injection molding machine further comprises an axial vibration excitation device arranged at the rear end of the injection screw, wherein the axial leads of the injection screw, a rod sleeve component, a vibration ring and the charging barrel are overlapped.

Due to the implementation of the above technical scheme, compared with the prior art, the utility model have the following advantage:

the utility model discloses a screw rod adds the scheme that shakes to combine the change of cavity internal pressure to make the injection screw rod form reciprocating vibration in the axial, and the vibration directly reaches the raw materials, change the characteristic of melting raw materials in injection, pressurize and the storage flow, reduce the energy consumption when obviously improving injection moulding's physical properties and outward appearance quality and promote production efficiency, simple structure in addition, it is with low costs, use compressed gas or hydraulic power drive, have great popularization and use value.

Drawings

FIG. 1 is a schematic front view (semi-sectional view) of the present axial excitation device;

FIG. 2 is an enlarged schematic view (viewing angle one) of the structure of the axial excitation device in FIG. 1;

fig. 3 is an enlarged schematic view (view angle two) of the structure of the axial excitation device in fig. 1;

FIG. 4 is an enlarged schematic view of a half section of FIG. 2;

wherein: 1. a charging barrel; 10. a barrel; 11. an injection nozzle; 12. a feeding channel;

2. an injection screw; 20. a power connection end; 21. an injection end;

3. an axial excitation device; 30. a rod and sleeve assembly; 300. a tensioning sleeve; 301. a heat insulating sleeve; 302. a bearing; a. a bearing inner race; b. a steel ball retainer; c. a steel ball; d. a bearing cap; e. a bearing seat; 303. a shaft sleeve seat; t1, sleeving a body; t2, an inner ring plate; t3, an outer ring plate; 31. a vibrating ring; 311. a first ring segment; 312. a counterweight ring; 313. a second ring segment; q1, a first cavity; q2, a second cavity; 32. a gas/oil path adjusting unit; 321. a first air/oil nozzle; 322. a second air/oil nozzle; 323. a first solenoid valve; 324. a second solenoid valve; 33. a first displacement sensor; 34. a second displacement sensor.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description thereof. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention may be embodied in many other forms different from those described herein and similar modifications may be made by those skilled in the art without departing from the spirit and scope of the invention and, therefore, the invention is not to be limited to the specific embodiments disclosed below.

In the description of the present invention, 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, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

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 to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present 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 the first and second features may be indirectly contacting each other 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 being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first 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, the device of the present embodiment includes a barrel 1, an injection screw 2, and an axial vibration excitation device 3.

The charging barrel 1 comprises a barrel body 10 with a cavity inside, an injection nozzle 11 arranged at the right end of the barrel body 10, and a feeding channel 12 arranged on the barrel body 10, wherein the hopper is communicated with the feeding channel 12.

The left end of the injection screw 2 is a power connection end 20, and the right end is an injection end 21, wherein the injection end 21 is located in the barrel 10.

In this example, splines are distributed on the circumferential direction of the power connection end 20, and the power device is in transmission connection with the injection screw 2 through the splines.

Specifically, the axial vibration excitation device 3 adopts a pneumatic or hydraulic power mode, and the reciprocating vibration displacement of the injection screw in the axial direction is 0.05-0.15mm.

As shown in fig. 2 to 4, the axial excitation device 3 is mounted at the tail end of the injection screw 2, and includes a rod sleeve assembly 30 that is sleeved on the injection screw 2 in a heat-insulating and relatively rotating manner, a vibration ring 31 that is slidably connected to the rod sleeve assembly 30 and forms a first cavity q1 and a second cavity q2 in the axial direction of the injection screw 2, and an air/oil path adjusting unit 32 that is respectively communicated with the first cavity q1 and the second cavity q2.

The axial leads of the injection screw 2, the rod sleeve component 30, the vibration ring 31 and the cylinder 10 are superposed.

Specifically, the rod sleeve assembly 30 includes a tension sleeve 300, a heat insulation sleeve 301, a bearing 302, and a shaft sleeve seat 303, which are sequentially sleeved from inside to outside, wherein the vibration ring 31 is slidably disposed on the shaft sleeve seat 303, and the shaft sleeve seat 303 and the vibration ring 31 cannot rotate along with the rotation of the injection screw 2. The requirements of heat insulation and relative rotation are met, and when the injection screw rotates, the part fixed on the shaft sleeve seat cannot rotate along with the injection screw.

In this example, the bearing 302 is a thrust ball bearing, and the thrust ball bearing includes a bearing inner race a with a steel ball mounting groove formed on a race, a steel ball retainer b, a steel ball c mounted in the steel ball retainer b, a bearing cap d with a race, and a bearing seat e, wherein the bearing cap d, the bearing inner race a, the steel ball retainer b, and the bearing seat e are assembled in an axial direction, and the sleeve seat 303 is mounted on an outer periphery of the bearing seat e.

The shaft sleeve seat 303 comprises a sleeve body t1, an inner ring plate t2 positioned inside the sleeve body t1 and an outer ring plate t3 positioned on the periphery of the sleeve body t1, wherein the inner ring plate t2 is arranged on the periphery of a bearing seat e and is abutted against a bearing cover d; the outer ring plate t3 is a partition plate and partitions the ring cavity of the vibration ring 31 into a first cavity q1 and a second cavity q2, wherein one of the first cavity q1 and the second cavity q2 is pressurized and the other is depressurized, and the vibration ring 31 is axially reciprocated along the injection screw 2 as the internal pressure of the first cavity q1 and the second cavity q2 is changed.

The vibration ring 31 includes a first ring plate 311, a weight ring 312, and a second ring plate 313 that are sequentially distributed along an axial direction and form a ring cavity inside, where the ring cavity and the outer ring plate t3 are self-lubricated and separated into a first cavity q1 and a second cavity q2.

The displacement of the oscillating ring 31 reciprocating along the axis is 20mm; the frequency of the reciprocating motion of the vibration ring 31 along the axis is 5 to 15hz.

A first displacement sensor 33 and a second displacement sensor 34 are respectively arranged at two axial ends of the vibration ring 31, namely the first ring piece 311 and the second ring piece 313, wherein the first displacement sensor 33 and the second displacement sensor 34 synchronously move along with the vibration ring 31 and monitor the displacement in real time.

The air/oil path adjusting unit 32 includes a first air nozzle/oil nozzle 321 and a second air nozzle/oil nozzle 322 respectively communicated with the first cavity q1 and the second cavity q2, a first air path/oil path and a second air path/oil path respectively communicated with the first air nozzle/oil nozzle 321 and the second cavity q2, and a first electromagnetic valve 323 and a second electromagnetic valve 324 disposed on the first air path/oil path and the second air path/oil path, wherein under the control of the first electromagnetic valve 323 and the second electromagnetic valve 324, one of the first air path/oil path and the second air path/oil path is pressurized, and the other air path/oil path is depressurized.

Furthermore, the utility model discloses a screw rod adds the scheme of shaking, installs the excitation device additional on using current mould and current ordinary injection molding machine, uses compressed gas or hydraulic power drive, and installs on the injection molding machine screw rod, and the vibration directly reaches the raw materials, changes the characteristic of melting raw materials in injection, pressurize and the storage flow, reduces the energy consumption when obviously improving injection moulding's physical properties and outward appearance quality and promotes production efficiency.

Specifically, the pressure of the first solenoid 323 and the pressure of the second solenoid 324 (both high-speed solenoids) are increased and decreased to change the pressure of the air/oil in the first cavity q1 and the second cavity q2 in real time, and the displacement of the first displacement sensor 33 and the second displacement sensor 34 is monitored in real time during the synchronous movement of the vibration ring 31, so that the change of the pressure of the air/oil is controlled to drive the vibration ring 31 to perform axial reciprocating motion, and at this time, the vibration ring 31 acts to transmit the reaction force to the injection screw to drive the injection screw to perform axial reciprocating vibration.

The tensioning sleeve and the heat insulation sleeve are conventional accessories, wherein the arrangement of the tensioning sleeve ensures concentricity; the heat insulation sleeve prevents the heat of the injection screw from being transferred to the thrust ball bearing to influence the normal work of the bearing.

Meanwhile, in the embodiment, the reciprocating vibration displacement of the injection screw rod along the axial lead direction is 0.05-0.15mm, and theoretical research and actual tests show that the axial micro-motion brought by the vibration device has the most obvious effect in two states from the end of injection to the initial pressure maintaining stage and the material storing stage.

The reciprocating vibration frequency of the injection screw rod along the axial lead direction is 5-15Hz, the optimal frequency in the injection pressure maintaining stage is 15Hz, and the optimal frequency in the material storage stage is 5Hz.

In addition, the weight ring of the vibration ring is used as a weight, the weight of the weight is determined by the screw characteristics of the equipment and the air source power or hydraulic power characteristics, and the weight of the weight can influence the vibration frequency and amplitude.

The vibration action mainly acts on an injection pressure maintaining stage and a material storage stage, the vibration controller judges and uses different vibration parameters and starting conditions through the current machine action after obtaining a safety signal and a starting signal, and the controller sends a vibration instruction to operate according to the set vibration parameters after the starting conditions are met.

The working condition I is as follows: the injection molding machine is at present the injection action, the injection screw moves to 20mm from 100mm and switches over and gets into the pressurize state, change the pressurize switch point promptly and be 20mm, set for filling volume and reach 90% and begin the vibration, begin the vibration when the injection screw position is less than 27mm, input 27mm vibration controller, set for vibration time 0.3s simultaneously, so the controller can be when the injection action, control the electronic ruler position, when the electronic ruler position is less than 27mm, begin the vibration, last 0.3s after stop vibrating.

Working conditions are as follows: the injection molding machine is the storage action at present, and injection screw moves to 90mm from 30mm during the storage, with 30mm input control ware, sets for the vibration and finishes to the storage action, and the controller can be when the storage action then, control electronic ruler position, and when the electronic ruler position was greater than 30mm, the vibration that begins stops after the storage action is finished.

After vibration begins, the control system conducts fine adjustment on the characteristics of the electromagnetic valve based on the current working frequency by analyzing the time relation between the action of the electromagnetic valve and a feedback signal, the reciprocating motion time of the vibration cylinder is consistent, the vibration action is uniform and stable, meanwhile, the opening and closing time angle of the electromagnetic valve is finely adjusted, and the dynamic performance is improved.

In summary, the present embodiment has the following advantages:

1) The screw rod vibration adding scheme is adopted, the injection screw rod is enabled to form reciprocating vibration in the axial direction by combining with the change of the internal pressure of the cavity, the vibration is directly transmitted to the raw material, the characteristics of the molten raw material in the injection, pressure maintaining and storage processes are changed (the temperature of the molten raw material is homogenized, the viscosity of the melt is reduced, and the shearing force is more balanced), the physical performance and the appearance quality of the injection molding product are obviously improved, and meanwhile, the energy consumption is reduced, and the production efficiency is improved.

2) In the injection filling process, the vibration force field can improve the shearing force of the melt in the movement process, so that the surface temperature of the melt and the internal temperature of the melt are more uniform, and the solidification characteristic caused by heat dissipation of the molten raw material by the inner wall of the mold cavity is reduced; meanwhile, the shearing friction between the melt and the nozzle, the pouring gate of the mold and the inner wall of the mold cavity is increased under the action of vibration, a part of heat dissipation capacity is generated, and the viscosity of the melt is further reduced, so that when the mold cavity is about to be filled with the melt, a vibration power field is superposed to reduce filling pressure and improve filling performance, and on the other hand, after vibration intervention, the injection molding machine can use an injection speed which is lower than the original speed, the exhaust performance of the mold is improved, the pressure of the mold cavity is effectively reduced, the residual stress of a product is smaller due to the stress of the pouring gate, and the problems of flash, cracks, warping, scorching and the like are avoided.

3) The injection molding machine is simple to use and install, does not need a special mold, can be used only by being additionally arranged on the existing injection molding machine equipment, can be driven by compressed gas or hydraulic power, is simple and convenient to operate, intelligent and low in cost, and has great popularization and use values.

The present invention has been described in detail, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and to implement the same, and the protection scope of the present invention should not be limited thereby, and all equivalent changes or modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.

Claims (10)

1. The axial excitation device is characterized in that: the axial vibration excitation device is arranged at the tail end of the injection screw, which is far away from the ejection end, is driven by compressed gas or hydraulic power, and comprises a rod sleeve component, a vibration ring and a gas/liquid path adjusting unit, wherein the rod sleeve component is sleeved on the injection screw in a heat insulation and relative rotation manner, the vibration ring is in sliding connection with the rod sleeve component and forms a first cavity and a second cavity in the axial direction of the injection screw, the gas/liquid path adjusting unit is respectively communicated with the first cavity and the second cavity, one of the first cavity and the second cavity is pressurized, the other one of the first cavity and the second cavity is decompressed, the vibration ring moves in a reciprocating manner along the axial direction of the injection screw along with the change of the internal pressure of the first cavity and the second cavity, and the rod sleeve component and the injection screw form reciprocating vibration displacement of 0.05-0.15mm in the axial direction.

2. The axial excitation device as set forth in claim 1, wherein: the axial leads of the injection screw, the rod sleeve component and the vibrating ring are superposed.

3. The axial excitation device as set forth in claim 1, wherein: the rod sleeve assembly comprises a tensioning sleeve, a heat insulation sleeve, a bearing and a shaft sleeve seat which are sequentially sleeved from inside to outside, wherein the vibration ring is arranged on the shaft sleeve seat in a sliding mode, and the shaft sleeve seat and the vibration ring cannot rotate along with the rotation of the injection screw.

4. The axial excitation device as set forth in claim 3, wherein: the bearing is a thrust ball bearing; and/or the thrust ball bearing comprises a bearing inner ring, a steel ball retainer, a steel ball, a bearing cover and a bearing seat, wherein the bearing inner ring is provided with a groove for mounting the steel ball, the steel ball retainer is mounted in the steel ball retainer, the bearing cover is provided with a bearing seat ring, the bearing cover is mounted with the bearing inner ring, the steel ball retainer, the bearing seat is axially assembled, and the shaft sleeve seat is mounted on the periphery of the bearing seat.

5. The axial excitation device as set forth in claim 4, wherein: the shaft sleeve seat comprises a sleeve body, an inner ring plate positioned in the sleeve body and an outer ring plate positioned on the periphery of the sleeve body, wherein the inner ring plate is arranged on the periphery of the bearing seat and abutted against the bearing cover; the outer ring plate is a partition plate and divides a ring cavity of the vibration ring into the first cavity and the second cavity.

6. The axial excitation device as set forth in claim 1 or 2 or 3 or 4 or 5, wherein: the gas/liquid path adjusting unit comprises a first gas nozzle/oil nozzle and a second gas nozzle/oil nozzle which are communicated with the first cavity and the second cavity respectively, a first gas path/oil path and a second gas path/oil path which are communicated with the first gas nozzle/oil nozzle and the second gas nozzle/oil nozzle respectively, and a first electromagnetic valve and a second electromagnetic valve which are arranged on the first gas path/oil path and the second gas path/oil path, wherein under the control of the first electromagnetic valve and the second electromagnetic valve, one of the first gas path/oil path and the second gas path/oil path is pressurized, and the other one of the first gas path/oil path and the second gas path/oil path is decompressed.

7. The axial excitation device as set forth in claim 1, wherein: the displacement of the vibration ring reciprocating along the axis is 20 +/-5 mm; and/or the frequency of the reciprocating motion of the vibration ring along the axis is 5 to 15Hz.

8. The axial excitation device as set forth in claim 7, wherein: the axial both ends of vibration ring be equipped with first displacement sensor and second displacement sensor, wherein first displacement sensor and second displacement sensor along with vibration ring synchronous motion and real-time supervision displacement.

9. The axial excitation device as recited in claim 1, wherein: the vibration ring comprises a first ring sheet, a counterweight ring and a second ring sheet which are sequentially distributed along the axial direction and internally form a ring cavity, wherein the ring cavity is self-lubricated and sealed by the rod sleeve assembly and is separated into a first cavity and a second cavity.

10. The utility model provides an injection molding machine, its includes feed cylinder, injection screw, wherein the leading end of injection screw is the injection end, and the tail end is power connection end, its characterized in that: the injection molding machine further comprises an axial excitation device mounted at the rear end of the injection screw and according to any one of claims 1 to 9, wherein the axial axes of the injection screw, the rod and sleeve assembly, the vibration ring and the barrel coincide.

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