CN110682510A

CN110682510A - Plasticizing power and injection power cooperative high-efficiency injection molding machine

Info

Publication number: CN110682510A
Application number: CN201910950921.7A
Authority: CN
Inventors: 陈明华
Original assignee: Suzhou Jin Ke Plastic Cement Science And Technology Ltd
Current assignee: Suzhou Jin Ke Plastic Cement Science And Technology Ltd
Priority date: 2019-10-08
Filing date: 2019-10-08
Publication date: 2020-01-14
Also published as: WO2021068479A1

Abstract

The invention discloses a plasticizing power and injection power cooperative high-efficiency injection molding machine, which comprises a machine shell, a charging barrel, a screw, a pressure sensor and a power system, wherein the power system comprises a sleeve, a plasticizing driving part, a transmission part, a connecting part, a nut and an injection driving part, the transmission part is a double-threaded screw with opposite thread turning directions, one thread section of the double-threaded screw is matched with a thread pair in the sleeve, the other thread section of the double-threaded screw is matched with the thread pair in the nut, and the end part of the other thread section protrudes out of the outer end part of the nut. The double-head screw is driven to linearly or rotationally move to drive the screw to synchronously move through the cooperation of different rotating speeds and rotating directions of the sleeve and the nut, so that the rated power of a motor of the injection molding unit is greatly reduced compared with that of the conventional injection molding machine, and meanwhile, the injection molding unit has a compact structure, small inertia of moving parts and quick response, can effectively enlarge an injection molding process window, and improves the stability and the yield of products.

Description

Plasticizing power and injection power cooperative high-efficiency injection molding machine

Technical Field

The invention belongs to the field of injection molding machines, and particularly relates to a high-efficiency injection molding machine with synergistic plasticizing power and injection power.

Background

Injection molding machines, also known as injection molding machines or injection molding machines. It is a main forming equipment for making various shaped plastic products from thermoplastic plastics or thermosetting plastics by using plastic forming mould. The injection molding machine can heat the plastic, apply high pressure to the molten plastic, and inject it to fill the mold cavity.

Therefore, the plastic injection molding process mainly comprises a plasticizing process, a loosening process and an injection process, wherein in the plasticizing process, a screw rod is mainly used for retreating and rotating around the axis of the screw rod to push the molten material to the discharging end part of the charging barrel; the pressure is released mainly in the loosening process, so that the molten material is prevented from leaking from the nozzle; the injection process is mainly to push the screw forward to extrude the molten material from the nozzle. That is, the screw rod moves backwards while rotating in the process of melting; the screw rod moves linearly backwards (does not rotate) in the loosening and retreating process; the screw moves straight forward (without rotation) during injection.

However, in the injection molding machine equipment in the industry at present, the utilization rate of the motor is low in the injection process and the plasticizing process, the power for plasticizing and the power for injection work relatively independently, when plasticizing, the plasticizing motor is basically in a high-load or even full-load working state, and at the moment, the injection motor only provides small back pressure and is basically in a no-load working state; when in injection, the injection motor is in a full-load working state, and the plasticizing motor is basically in a no-load working state, so that in order to realize the plastic injection, the rated power required by the selected plasticizing motor and the selected injection motor is higher, and the cost of the injection molding machine is higher. Therefore, some manufacturers have thought that the whole injection molding process is completed together by cooperation of plasticizing power and injection power, so that the rated power of power output is reduced, and the cost is reduced.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide an improved plasticizing power and injection power cooperative high-efficiency injection molding machine.

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

a high-performance injection molding machine with synergistic plasticizing power and injection power comprises:

a housing;

the charging barrel comprises a barrel body and a nozzle, wherein the barrel body is internally provided with a cavity and is communicated with the shell from one end part, the nozzle is positioned at the other end part of the barrel body, and the barrel body is provided with a plastic raw material inlet;

a screw extending along the length of the barrel;

a pressure sensor;

a power system for driving the screw rod to rotate around the axis of the screw rod and to move linearly along the length direction of the screw rod,

in particular, the power system comprises a sleeve, a plasticizing driving piece, a transmission part, a connecting part, a nut and an injection driving piece, wherein the central line of the sleeve is coincident with the axial line of the screw rod and is arranged in the shell through a rotating connecting piece, the plasticizing driving piece drives the sleeve to rotate around the self axial line, the transmission part penetrates through the sleeve, the connecting part is used for connecting the transmission part and the screw rod far away from the extrusion end part, the nut is rotatably arranged in the shell through the rotating connecting piece, one end part of the nut protrudes out from the end part of the shell far away from the charging barrel, the, the transmission part is a double-threaded screw with opposite thread turning directions, one thread section of the double-threaded screw is matched with the thread pair in the sleeve, the other thread section of the double-threaded screw is matched with the thread pair in the nut, and the end part of the other thread section protrudes out of the outer end part of the nut, so that the double-threaded screw is driven to linearly move or/and reversely rotate towards the outer end part of the nut under the coordination of opposite rotation of the sleeve and the nut.

Preferably, the double-threaded screw comprises a first thread section matched with the sleeve and a second thread section matched with the nut, wherein the first thread section and the second thread section are fixedly connected from one end part, and the axial lines of the first thread section and the second thread section are collinear and coincide with the axial line of the screw. That is, wherein the first thread segment and the second thread segment are on the same component.

Furthermore, the thread pitch of the first thread section is larger than that of the second thread section, and the thread pitch of the first thread section is N times of that of the second thread section, wherein N is not less than 2 and is an integer. The arrangement is suitable for injection molding machines of different models, and the movement state of the double-head screw is adjusted at different rotation speeds of the nut and the sleeve under different screw pitches.

According to a specific implementation and preferred aspect of the invention, the outer periphery of the sleeve is further provided with a connecting flange connected with the plasticizing driving member, the power system further comprises an elastic member, two end portions of the elastic member are connected between the connecting flange and the connecting member and sleeved on the outer periphery of the double-end screw, and when the connecting member rotates and retreats towards the inside of the casing or linearly retreats towards the inside of the casing, the elastic member is in a compression deformation state; when the connecting part moves towards the outside of the shell, the elastic part is in a recovery deformation state.

Preferably, the resilient member is a spring and both ends are fixed to flanges connecting the cap and the sleeve, wherein the spring is in a compressible or/and twistable arrangement.

Specifically, the connecting part is a fixing flange and fixedly connects the inner end part of the double-end screw with the end part of the screw far away from the injection.

According to a further embodiment and preferred aspect of the invention, a housing liner is detachably arranged inside the housing, and the sleeve and the nut are each rotatably arranged on the housing liner by means of a rotary connection, wherein the rotary connection is a bearing.

Preferably, the pressure sensor is arranged between the end of the housing liner remote from the cartridge and the end of the housing close to the injection drive.

Specifically, the tip that the feed cylinder was kept away from to the casing forms the ladder cavity, and the casing inside lining is filled in ladder intracavity portion, and inside first inner chamber and the second inner chamber that forms the matching with it of casing inside lining, and wherein the diameter of first inner chamber is greater than the diameter of second inner chamber, and the bearing sets up respectively in first inner chamber and second inner chamber, and sleeve and nut rotate the setting relative to the casing inside lining.

Preferably, the plasticizing drive comprises a plasticizing gear arranged concentrically with the sleeve, a plasticizing drive for driving the plasticizing gear, and a plasticizing motor.

Preferably, the injection driving member comprises an injection gear sleeved at the outer end of the nut and concentrically arranged with the nut, an injection driving member for driving the injection gear, and an injection motor.

In addition, the end part of the machine shell and the periphery of the charging barrel are also provided with cooling sleeves, wherein the cooling sleeves are provided with feeding holes communicated with the plastic raw material inlet.

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

the double-head screw is driven to linearly or rotationally move to drive the screw to synchronously move through the cooperation of different rotating speeds and rotating directions of the sleeve and the nut, so that the rated power of a motor of the injection molding unit is greatly reduced compared with that of the conventional injection molding machine, and meanwhile, the injection molding unit has a compact structure, small inertia of moving parts and quick response, can effectively enlarge an injection molding process window, and improves the stability and the yield of products.

Drawings

FIG. 1 is a schematic cross-sectional view of the structure of the injection molding machine of the present invention (during plasticizing or releasing);

FIG. 2 is a schematic cross-sectional view of the structure of the injection molding machine of the present invention (during the injection process);

wherein: 1. a housing;

2. a charging barrel; 20. a barrel; 20a, a plastic material inlet; 200. a cavity; 21. a nozzle;

3. a screw;

4. a power system; 40. a sleeve; 41. plasticizing the driving member; 410. plasticizing the gear; 42. a transmission member; 421. a first thread segment; 422. a second thread segment; 43. a connecting member; 44. a nut; 45. an injection drive; 450. injection molding a gear; 46. a connecting flange; 47. an elastic member (spring); z, rotational connections (bearings);

5. a pressure sensor;

6. a housing liner; q1, a first lumen; q2, a second lumen;

7. a cooling jacket; 7a and a feeding hole.

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 such 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 can include, for example, fixed connections, removable connections, or integral parts; 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 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 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 plasticizing power and injection power cooperating high-performance injection molding machine of the present embodiment includes a housing 1, a barrel 2, a screw 3, a power system 4 and a pressure sensor 5.

Specifically, the barrel 2 includes a barrel 20 having a cavity 200 therein and communicating with the casing 1 from one end, and a nozzle 21 located at the other end of the barrel 20, wherein a plastic material inlet 20a is provided on the barrel 20.

And the screw rod 3 extends along the length direction of the barrel 2 and is matched with the cavity 200 of the barrel 20.

And the power system 4 is used for driving the screw rod 3 to rotate around the axis of the screw rod and to linearly move along the length direction of the screw rod.

In this example, the power system 4 includes a sleeve 40 whose center line coincides with the axis of the screw 3 and which is disposed in the housing 1 through a rotary joint z, a plasticizing drive member 41 for driving the sleeve 40 to rotate around its own axis, a transmission member 42 passing through the inside of the sleeve 40, a connection member 43 for connecting the transmission member 42 and the screw 3 away from the extrusion end, a nut 44 which is rotatably disposed in the housing 1 through the rotary joint z and has one end protruding from the end of the housing 1 away from the barrel 2, and an injection drive member 45 which is disposed at the outer end of the nut 44 and drives the nut to rotate around its own axis.

The transmission component 42 is a double-threaded screw with opposite thread turning directions, and the double-threaded screw comprises a first thread section 421 matched with the internal thread pair of the sleeve 40 and a second thread section 422 matched with the internal thread pair of the nut 44, wherein the first thread section 421 and the second thread section 422 are fixedly connected from one end part, and the axial lines of the first thread section 421 and the second thread section 422 are collinear and are superposed with the axial line of the screw 3. That is, the first thread segments 421 and the second thread segments 422 are provided on the same component.

In this example, the pitch of the first thread segments 421 is 4 times the pitch of the second thread segments 422. Thus, the movement of the double-ended screw is adjusted at different thread pitches to achieve different rotational speeds of the nut 44 and sleeve 40.

The periphery of the sleeve 40 is further provided with a connecting flange 46 connected with the plasticizing driving part 41, the power system further comprises an elastic part 47, two end parts of which are connected between the connecting flange 46 and the connecting part 43 and are sleeved on the periphery of the double-end screw, wherein when the connecting part 43 rotates and retreats towards the interior of the machine shell 1 or linearly retreats towards the interior of the machine shell 1, the elastic part 47 is in a compression deformation state; when the connecting member 43 moves outward of the casing 1, the elastic member 47 is in a restored deformed state.

In this case, the spring element 47 is a spring, which is arranged in a compressible and/or rotatable manner, and is fixed at both ends to the connecting part 43 and the connecting flange 46.

Specifically, the connecting member 43 is a fixed flange, and fixedly connects the inner end portion of the double-headed screw to the end portion of the screw 3 remote from the injection end portion.

A housing liner 6 is detachably arranged inside the housing 1, and the sleeve 40 and the nut 44 are each rotatably arranged on the housing liner 6 by means of a rotary connection z, which is a bearing.

The end of the machine shell 1 far away from the charging barrel 2 forms a step cavity, the machine shell liner 6 is plugged into the step cavity, a first inner cavity q1 and a second inner cavity q2 matched with the machine shell liner 6 are formed inside the machine shell liner 6, the diameter of the first inner cavity q1 is larger than that of the second inner cavity q2, bearings are arranged in the first inner cavity q1 and the second inner cavity q2 respectively, and the sleeve 40 and the nut 44 are arranged in a rotating mode relative to the machine shell liner 6.

The plasticizing drive 41 includes a plasticizing gear 410 disposed concentrically with the sleeve 40, a plasticizing transmission (not shown, but not contemplated) for driving the plasticizing gear 410, and a plasticizing motor (not shown, but not contemplated).

In this example, the plasticizing gear 410 is rigidly connected (fixedly connected) to the sleeve 40 via the connecting flange 46

The injection drive member 45 includes an injection gear 450 disposed concentrically with the nut 44 at an outer end of the nut 44, an injection drive member (not shown but not contemplated) for driving the injection gear 450, and an injection motor (not shown but not contemplated).

A pressure sensor 5 is provided between the end of the housing liner 6 remote from the cartridge 2 and the end of the housing 1 near the injection drive 45. Wherein, the pressure sensor 5 can control the motion state of the plasticizing motor and the injection motor according to a set value.

In addition, a cooling jacket 7 is arranged at the end part of the machine shell 1 and the periphery of the charging barrel 2, wherein a feeding hole 7a communicated with the plastic raw material inlet 20a is arranged on the cooling jacket 7.

The implementation process of the implementation is as follows:

firstly, a plasticizing process:

referring to fig. 1, the molten material is injected into the barrel 2 from the inlet 7a and the plastic material inlet 20a, the plasticizing gear 410 is driven by the plasticizing motor to rotate, thereby driving the sleeve 40 to rotate, and simultaneously driving the injection gear 450 to rotate by the injection motor, thereby driving the nut 44 to rotate, under the conditions of opposite rotation directions and different rotation speeds of the sleeve 40 and the nut 44, the force generated by the double-end screw in the axial direction is zero, the force in the radial direction drives the outer end of the double-ended screw back out of the nut 44, i.e., the double-ended screw is now put into rotational motion by the cooperation of the sleeve 40 and the nut 44, and retreats (moves to the right) in the axial direction of the screw 3, so that the melt moves toward the front end of the barrel 2 by the reverse pushing of the screw 3, and the spring 46 is compressed to store the pressure, and the torsional deformation is restored to provide a part of the plasticizing torque.

Second, the loosening process (the state is similar to that of fig. 1, and the drawings are omitted here):

after the plasticizing step is completed, the plasticizing motor drives the plasticizing gear 410 to rotate, so as to drive the sleeve 40 to rotate; meanwhile, the injection motor drives the injection gear 450 to rotate, so as to drive the nut 44 to rotate, and under the conditions that the rotation directions of the sleeve 40 and the nut 44 are opposite and the rotation speeds are different, the acting force of the double-headed screw in the radial direction is zero, and the acting force formed in the axial direction drives the double-headed screw to move backwards along the linear direction, that is, the double-headed screw does not rotate under the synergistic action of the sleeve 40 and the nut 44 at the moment, but moves backwards (moves towards the right in the figure) along the axial direction, so as to drive the screw 3 to linearly backwards, so as to realize loosening, and meanwhile, the spring 46 is further.

Thirdly, injection process:

after the above-mentioned loosening is completed, the injection motor drives the injection gear 450 to rotate reversely, so as to drive the nut 44 to rotate reversely, and the plasticizing motor drives the plasticizing gear 410 to rotate reversely, so as to drive the sleeve 40 to rotate reversely, so that the acting force of the double-headed screw in the radial direction is zero in the states that the sleeve 40 and the nut 44 rotate reversely and rotate at different speeds, and the acting force formed in the axial direction is all leftward, and the double-headed screw does not rotate under the cooperation of the sleeve 40 and the nut 44, but moves leftward in the axial direction, so as to eject the molten material from the nozzle, at this time, the spring 46 recovers to deform to provide a part of the injection pressure, and is also distorted to store the torque.

In conclusion, the double-head screw is driven to linearly or rotationally move to drive the screw to synchronously move through the cooperation of different rotating speeds and rotating directions of the sleeve and the nut, so that the rated power of a motor of the injection molding unit is greatly reduced compared with that of the conventional injection molding machine, and meanwhile, the injection molding unit is compact in structure, small in moving part inertia and fast in response, can effectively enlarge an injection molding process window, and improves the stability and the yield of products.

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. A high-performance injection molding machine with synergistic plasticizing power and injection power comprises:

a housing;

the charging barrel comprises a barrel body and a nozzle, wherein the barrel body is internally provided with a cavity and is communicated with the shell from one end part, the nozzle is positioned at the other end part of the barrel body, and a plastic raw material inlet is formed in the barrel body;

a screw extending along a length of the barrel;

a pressure sensor;

the power system is used for driving the screw rod to rotate around the axis of the screw rod and move linearly along the length direction of the screw rod,

the method is characterized in that: the power system comprises a sleeve, a plasticizing driving piece, a transmission part, a connecting part, a nut and an injection driving piece, wherein the central line of the sleeve is coincident with the axial line of the screw rod and is arranged in a shell through a rotating connecting piece, the plasticizing driving piece drives the sleeve to rotate around the self axial line, the transmission part penetrates through the sleeve, the connecting part is used for connecting the transmission part with the screw rod far away from an extrusion end part, the nut is arranged in the shell in a rotating way through the rotating connecting piece, one end part of the nut protrudes out of the end part of the shell far away from the charging barrel, the injection driving piece is arranged at the outer end part of the nut and drives the nut to rotate around the self axial line, the transmission part is a double-head screw rod with opposite thread turning directions, one thread section of the double-head screw rod is matched with a thread pair in the sleeve, the sleeve and the nut rotate in opposite directions to drive the double-end screw to move linearly or/and rotate backwards towards the outer end part of the nut.

2. The synergistic plasticizing and injection power high performance injection molding machine of claim 1 wherein: the double-thread screw comprises a first thread section matched with the sleeve and a second thread section matched with the nut, wherein the shaft axes of the first thread section and the second thread section are collinear and coincide with the shaft axis of the screw.

3. The synergistic plasticizing and injection power high performance injection molding machine of claim 2, wherein: the thread pitch of the first thread section is larger than that of the second thread section, the thread pitch of the first thread section is N times of that of the second thread section, wherein N is not less than 2 and is an integer.

4. The synergistic plasticizing and injection power high performance injection molding machine of claim 1 wherein: the periphery of the sleeve is also provided with a connecting flange connected with the plasticizing driving piece, the power system also comprises an elastic piece, two end parts of the elastic piece are connected between the connecting flange and the connecting part and sleeved on the periphery of the double-end screw rod, and when the connecting part rotates and retreats towards the inside of the shell or linearly retreats towards the inside of the shell, the elastic piece is in a compression deformation state; when the connecting part moves towards the outside of the shell, the elastic part is in a recovery deformation state.

5. The synergistic plasticizing and injection power high performance injection molding machine of claim 4, wherein: the connecting part is a fixed flange and fixedly connects the inner end part of the double-end screw with the end part of the screw far away from the ejection.

6. The synergistic plasticizing and injection power high performance injection molding machine of claim 1 wherein: the casing is detachably provided with a casing lining, the sleeve and the nut are rotatably arranged on the casing lining through the rotating connecting piece, wherein the rotating connecting piece is a bearing.

7. The synergistic plasticizing and injection power high performance injection molding machine of claim 6, wherein: the pressure sensor is disposed between the end of the housing liner distal from the cartridge and the end of the housing proximal to the injection driver.

8. The synergistic plasticizing and injection power high performance injection molding machine of claim 7, wherein: the casing keep away from the tip of feed cylinder forms the ladder cavity, the casing inside lining fill in ladder intracavity portion, just inside first inner chamber and the second inner chamber that forms and match with it of casing inside lining, wherein the diameter of first inner chamber be greater than the diameter of second inner chamber, the bearing sets up respectively first inner chamber with in the second inner chamber, the sleeve with the nut is relative the casing inside lining rotates the setting.

9. The synergistic plasticizing and injection power high performance injection molding machine of claim 1 wherein: the plasticizing driving part comprises a plasticizing gear concentric with the sleeve, a plasticizing driving part used for driving the plasticizing gear and a plasticizing motor.

10. The synergistic plasticizing and injection power high performance injection molding machine of claim 1 wherein: the injection driving part comprises an injection gear, an injection driving part and an injection motor, wherein the injection gear is sleeved at the outer end part of the nut and is concentrically arranged with the nut, and the injection driving part is used for driving the injection gear.