CN210257128U

CN210257128U - Screw rod group and injection molding mechanism with same

Info

Publication number: CN210257128U
Application number: CN201920268698.3U
Authority: CN
Inventors: 刘松; 张建
Original assignee: Futaihua Industry Shenzhen Co Ltd
Current assignee: Futaihua Industry Shenzhen Co Ltd
Priority date: 2019-03-01
Filing date: 2019-03-01
Publication date: 2020-04-07
Anticipated expiration: 2029-03-01

Abstract

The utility model provides a screw rod group, including the screw rod, the screw head, thrust ring and non-return ring, thrust ring sets up in the one end of screw rod, the screw head includes the rod head portion, connecting portion and setting portion, the rod head portion passes through connecting portion with setting portion and is connected, setting portion passes the thrust ring and sets up in the tip of screw rod, non-return ring activity ground cover is located on the connecting portion, the diameter that the rod head portion is close to connecting portion department is greater than the diameter of connecting portion, the perisporium that the rod head portion is close to connecting portion department sets up the chamfer, and its diameter diminishes gradually to the same with the diameter of connecting portion along the rod head portion to the direction of connecting portion, non-return ring's internal diameter is less than the maximum diameter of rod head portion and is greater than the diameter of connecting portion, non-return ring sets up the. The utility model discloses still provide a mechanism of moulding plastics that has this screw group. The screw head and the check ring are chamfered, so that the melt flow shearing force is reduced, and the precipitation is prevented.

Description

Screw rod group and injection molding mechanism with same

Technical Field

The utility model relates to an injection molding machine accessory, especially a screw rod group and have the mechanism of moulding plastics of this screw rod group.

Background

Injection molding is a common processing method in industry, and is usually performed by an injection molding machine. When the plastic raw material containing the whitening agent (particularly titanium dioxide and the like) is processed by the currently used injection molding machine, the problem of whitening agent precipitation can occur at the forming and melting temperature due to the addition of the whitening agent in the raw material, so that black lines appear on the product, and the quality of the product is seriously influenced.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is desirable to provide a screw set and an injection molding mechanism having the same to solve the above problems.

A screw group comprises a screw, a screw head, a thrust ring and a non-return ring, wherein the thrust ring is arranged at one end of the screw, the screw head comprises a head part, a connecting part and a setting part, the head part is connected with the setting part through the connecting part, the setting part is arranged at the end part of the screw rod through the thrust ring, the non-return ring is movably sleeved on the connecting part, the diameter of the rod head part close to the connecting part is larger than that of the connecting part, a chamfer is arranged on the peripheral wall of the rod head part close to the connecting part, and the diameter of the connecting part is gradually reduced to be the same as the diameter of the connecting part along the direction from the rod head part to the connecting part, the inner diameter of the non-return ring is smaller than the maximum diameter of the rod head and larger than the diameter of the connecting part, the inner wall of the non-return ring close to the rod head is provided with a chamfer, and the chamfer degree is equal to the chamfer degree of the peripheral wall of the rod head close to the connecting part.

Further, the chamfer of the peripheral wall of the rod head part close to the connecting part and the chamfer of the check ring close to the inner wall of the rod head part are 60 degrees.

Furthermore, the setting part is close to the connecting part and is provided with a fixing ring along the circumferential direction of the connecting part, and the fixing ring is used for being matched with the thrust ring to fix the setting part on the end part of the screw rod.

Further, the diameter of thrust is greater than the diameter of solid fixed ring, the thrust ring is close to solid fixed ring's perisporium sets up the chamfer, and its diameter is followed solid fixed ring to the direction grow gradually of screw rod and with gu the diameter of solid fixed ring junction with gu the fixed ring is close to the diameter of thrust ring department is the same, the internal diameter of non-return ring is less than the maximum diameter of thrust ring and be greater than gu the maximum diameter of fixed ring, non-return ring is close to the inner wall of thrust ring sets up the chamfer, and its chamfer with the chamfer number of degrees that the thrust ring is close to solid fixed ring's perisporium is equal.

Furthermore, the chamfer angle of the peripheral wall of the thrust ring close to the fixing ring and the chamfer angle of the non-return ring close to the inner wall of the thrust ring are 60 degrees.

Further, the diameter of the fixing ring is larger than that of the connecting portion, and the diameter of the peripheral wall of the fixing ring close to the connecting portion is gradually reduced to be the same as that of the connecting portion along the direction of the fixing ring towards the connecting portion.

Further, the compression ratio of the screw was 1.9.

Further, the surfaces of the screw, the screw head, the thrust ring and the non-return ring are all subjected to surface treatment and polishing.

Furthermore, crystal titanium nitride coatings are added on the surfaces of the screw, the screw head, the thrust ring and the non-return ring.

An injection molding mechanism comprises a material cylinder, a screw rod head, a thrust ring, a non-return ring, a nozzle and a nozzle flange, wherein the screw rod is arranged in the material cylinder in a penetrating way, the thrust ring is arranged at one end of the screw rod, the screw rod head comprises a rod head part, a connecting part and a setting part, the rod head part is connected with the setting part through the connecting part, the setting part penetrates through the thrust ring and is arranged at the end part of the screw rod, the non-return ring is movably sleeved on the connecting part, the nozzle is arranged on the material cylinder through the nozzle flange, the diameter of the rod head part close to the connecting part is larger than that of the connecting part, the peripheral wall of the rod head part close to the connecting part is provided with a chamfer, the diameter of the rod head part is gradually reduced to be the same as that of the connecting part along the direction of the rod head part towards the connecting part, and the inner diameter of, the inner wall of the non-return ring close to the rod head is provided with a chamfer, and the chamfer degree is equal to the chamfer degree of the peripheral wall of the rod head close to the connecting part.

The screw assembly adopts a chamfer angle mode for the screw head and the check ring to increase the flow rate of plastic raw material melting, reduce the obstruction during flowing, reduce the shearing force of melting flow and prevent the precipitation of the whitening agent.

Drawings

Fig. 1 is a schematic perspective view of an injection molding mechanism according to an embodiment of the present invention.

Fig. 2 is a cross-sectional view of the injection molding mechanism shown in fig. 1.

Fig. 3 is a partially enlarged schematic view of the injection molding mechanism shown in fig. 2.

FIG. 4 is a perspective view of the screw set of the injection molding mechanism of FIG. 1.

Fig. 5 is an exploded perspective view of the screw set shown in fig. 4.

Description of the main elements

The following detailed description of the invention will be further described in conjunction with the above-identified drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It will be understood that 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. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 to 3, an injection mechanism 100 of an injection molding apparatus is provided. The injection mechanism 100 can melt plastic raw materials and inject liquid plastic into a mold cavity of an injection molding device to mold products, and particularly can melt and inject the plastic raw materials containing whitening agents (such as titanium white powder and the like) without generating spray marks. The injection molding mechanism 100 includes a barrel 10, a screw 20, a screw head 30, a thrust ring 40, a check ring 50, a nozzle 60, and a nozzle flange 70. Wherein the screw 20, the screw head 30, the thrust ring 40 and the non-return ring 50 are screw groups of the injection molding mechanism 100. The cartridge 10 is used for introducing and melting plastic raw materials. A screw 20 is inserted into the barrel 10. The screw 20 can be moved in the barrel 10 by a drive mechanism of the injection molding apparatus to convey, compact, melt, stir, and apply pressure to the plastic raw material. The screw head 30 is disposed at one end of the screw 20 and is located within the barrel 10. Thrust collar 40 is disposed at an end of screw 20 proximate screw head 30. The check ring 50 is movably sleeved on the screw head 30. Thrust ring 40 serves to stop check ring 50 from sliding out of screw head 30. The nozzle 60 is disposed on the cartridge 10 by a nozzle flange 70. The nozzle 60 is used to inject molten plastic material into the mold cavity as the screw 20 moves.

Specifically, the barrel 10 is provided with a material storage cavity 11 along the axial direction. The holding chamber 11 is used for placing and melting the plastic raw material therein. The barrel 10 is further provided with a feeding hole 12 in the direction perpendicular to the axis. The feeding hole 12 is communicated with the material storage cavity 11. The inlet opening 12 is used to let plastic material to be used in a hopper of the injection molding apparatus into the storage chamber 11. A screw 20 is inserted through the barrel 10 from one end of the storage chamber 11. The screw head 30, the thrust ring 40 and the non-return ring 50 are all located in the material storage cavity 11. A nozzle flange 70 secures the nozzle 60 from the other end of the holding chamber 11.

Referring to fig. 4, the screw 20 includes a driving section 21 and an actuating section 22 integrally formed. The driving section 21 is driven by a driving mechanism of the injection molding device to move and rotate. The actuating section 22 is provided with a screw rib 221 and a screw groove 222 around the circumference thereof. The actuating section 22 is used for moving and rotating under the driving of the driving section 21 to convey, compact, melt, stir and press the plastic raw material in the material storage cavity 11. Specifically, the action section 22 includes a solids conveying section (not shown), a melting section (not shown), and a homogenizing section (not shown) connected to each other.

The solid conveying section is also called a feeding section and is used for compacting and conveying the plastic raw material fed into the material storage cavity 11 from the feeding hole 12.

The melting section, also called the compression section, is used to further compact and plasticize the plastic material, so that the air enclosed in the plastic material is compressed back to the feeding hole 12 and discharged.

The homogenizing section is also called a metering section and is used for further plasticizing and homogenizing the plastic raw material, and keeping the plastic raw material at a constant pressure, a constant quantity and a constant temperature.

Referring to fig. 3 to 5, the screw head 30 includes a head portion 31, a connecting portion 32 and a setting portion 33. The rod head 31 and the setting portion 33 are connected by a connecting portion 32. The shaft head 31 is substantially arrow-shaped. The peripheral wall of the rod head 31 has a plurality of diversion channels 311 formed along the axial direction of the screw head 30. A plurality of distribution channels 311 are provided for the molten plastic material to flow through. The connecting portion 32 is substantially columnar. The check ring 50 is substantially cylindrical and is fitted over the connection portion 32. A thrust collar 40 is provided at the end of the screw 20 near the homogenization section. The setting section 33 is provided at the end of the screw 20 near the homogenization section through the thrust ring 40. The setting portion 33 is provided with a fixing ring 331 along its circumferential direction near the connecting portion 32. The fixing ring 331 is used to fix the setting portion 33 to the end of the screw 20 in cooperation with the thrust ring 40.

Further, the diameter of the rod head 31 near the connecting portion 32 is larger than that of the connecting portion 32, and the peripheral wall of the rod head 31 near the connecting portion 32 is provided with a chamfer α 1, the diameter of which is gradually reduced to be the same as that of the connecting portion 32 in the direction from the rod head 31 to the connecting portion 32, the diameter of the fixing ring 331 is larger than that of the connecting portion 32, and the diameter of the peripheral wall of the fixing ring 331 near the connecting portion 32 is gradually reduced to be the same as that of the connecting portion 32 in the direction from the fixing ring 331 to the connecting portion 32.

The diameter of the thrust ring 40 is greater than that of the fixing ring 331, one end of the thrust ring 40 close to the fixing ring 331 is a circular ring, and the circular ring abuts against one side of the fixing ring 331 far away from the connecting portion 32. the peripheral wall of the thrust ring 40 close to the circular ring is provided with a chamfer α 2, the diameter of the chamfer is gradually increased along the direction from the fixing ring 331 to the screw 20, and the diameter of the joint of the chamfer and the circular ring is the same as that of the fixing ring 331 close to the thrust ring 40.

The inner diameter of check ring 50 is smaller than the maximum diameter of stem head 31 and larger than the diameter of connecting portion 32. the outer diameter of check ring 50 is equal to the inner diameter of the storage chamber.A chamfer β 1 is formed on check ring 50 near the inner wall of stem head 31. chamfer β 1 is equal to chamfer α 1 of stem head 31. in this embodiment, chamfer α 1 on the peripheral wall of stem head 31 near connecting portion 32 and chamfer β 1 on check ring 50 near the inner wall of stem head 31 are both 60 deg..

The inner diameter of non-return ring 50 is smaller than the maximum diameter of thrust ring 40 and larger than the maximum diameter of fixing ring 331. non-return ring 50 has a chamfer β 2 near the inner wall of thrust ring 40, chamfer β 2 is equal to chamfer α 2 of thrust ring 40. in this embodiment, chamfer α 2 of the circumferential wall of thrust ring 40 near fixing ring 331 and chamfer β 2 of non-return ring 50 near the inner wall of thrust ring 40 are both 60 °.

The screw head 30, the thrust ring 40 and the non-return ring 50 are chamfered to increase the flow rate of the molten plastic material, reduce the obstruction during the flow and reduce the shear force of the molten flow.

In order to reduce the problems that the fluidity of plastic materials is reduced due to the increase of the friction coefficient after the surface of the screw 20 has precipitates and the carbonization and the degradation are caused due to the overlong combustion melting time in the use process of the surface of the screw, the surfaces of the screw 20, the screw head 30, the thrust ring 40 and the non-return ring 50 are subjected to surface treatment and polishing, the surface smoothness is improved, and the generation of the precipitates is reduced. In this embodiment, the surfaces of the screw 20, the screw head 30, the thrust ring 40, and the check ring 50 are treated to increase the titanium crystal nitride coating.

The compression ratio of the screw 20 is in the range of 1.8 to 4. (the screw compression ratio refers to the ratio of the volume of one spiral groove in the feeding section of the screw to the volume of the last spiral groove in the metering section). In this embodiment, the deposit is preferably compressed and extruded by means of a screw 20 with a compression ratio of 1.9.

The nozzle 60 has an injection hole 61 formed along the axial direction thereof. The injection holes 61 are used for injecting the molten plastic material in the storage chamber 11.

The utility model provides an injection moulding mechanism 100 is through adopting the mode of chamfer to screw head 30, thrust ring 40 and non-return ring 50, increases the fused flow rate of plastic materials, and the hindrance when reducing to flow reduces the fusion shearing force that flows. And the joint of the screw 20 and the screw head 30 is improved, so that the increase of the air pressure of a connecting closed space is reduced when the injected molten plastic is heated at high temperature, the phenomenon of spraying and remaining marks is overcome, the fluidity of plastic raw materials is improved, and the precipitation of a whitening agent is prevented.

In addition, other changes may be made by those skilled in the art without departing from the spirit of the invention, and it is intended that all such changes be considered within the scope of the invention.

Claims

1. The utility model provides a screw rod group, includes screw rod, screw rod head, thrust ring and non-return ring, the thrust ring set up in the one end of screw rod, the screw rod head includes rod head portion, connecting portion and setting portion, rod head portion with setting portion passes through connecting portion connect, setting portion passes the thrust ring set up in the tip of screw rod, non-return ring activity ground cover is located on the connecting portion, its characterized in that: the diameter of the rod head part close to the connecting part is larger than that of the connecting part, the peripheral wall of the rod head part close to the connecting part is provided with a chamfer, the diameter of the rod head part is gradually reduced to be the same as that of the connecting part along the direction from the rod head part to the connecting part, the inner diameter of the non-return ring is smaller than the maximum diameter of the rod head part and is larger than that of the connecting part, the inner wall of the non-return ring close to the rod head part is provided with a chamfer, and the chamfer degree is equal to that of the peripheral wall of the connecting part close to the rod head part.

2. The screw set of claim 1, wherein: the chamfer angle of the peripheral wall of the rod head part close to the connecting part and the chamfer angle of the non-return ring close to the inner wall of the rod head part are 60 degrees.

3. The screw set of claim 1, wherein: the setting part is close to the connecting part and is provided with a fixing ring along the circumferential direction of the connecting part, and the fixing ring is used for being matched with the thrust ring to fix the setting part on the end part of the screw rod.

4. A screw set according to claim 3, wherein: the diameter of thrust is greater than the diameter of solid fixed ring, the thrust collar is close to solid fixed ring's perisporium sets up the chamfer, and its diameter is followed solid fixed ring to the direction grow gradually of screw rod and with gu the diameter of solid fixed ring junction with gu the fixed ring is close to the diameter of thrust collar department is the same, the internal diameter of non-return ring is less than the maximum diameter of thrust collar and is greater than gu the maximum diameter of fixed ring, non-return ring is close to the inner wall of thrust collar sets up the chamfer, and its chamfer with the chamfer number of degrees that the thrust collar is close to gu the perisporium of fixed ring equals.

5. The screw set of claim 4, wherein: the chamfer angle of the peripheral wall of the thrust ring close to the fixing ring and the chamfer angle of the non-return ring close to the inner wall of the thrust ring are 60 degrees.

6. A screw set according to claim 3, wherein: the diameter of the fixing ring is larger than that of the connecting portion, and the diameter of the peripheral wall, close to the connecting portion, of the fixing ring is gradually reduced to be the same as that of the connecting portion along the direction of the fixing ring towards the connecting portion.

7. The screw set of claim 1, wherein: the compression ratio of the screw was 1.9.

8. The screw set of claim 1, wherein: and the surfaces of the screw, the screw head, the thrust ring and the non-return ring are subjected to surface treatment and polishing.

9. The screw set of claim 8, wherein: and crystal titanium nitride coatings are added on the surfaces of the screw, the screw head, the thrust ring and the non-return ring.

10. The utility model provides an injection molding mechanism, includes feed cylinder, screw rod head, thrust ring, non-return ring, nozzle and nozzle flange, the screw rod is worn to locate in the feed cylinder, the thrust ring set up in the one end of screw rod, the screw rod head includes rod head portion, connecting portion and setting portion, the rod head portion with the setting portion passes through connecting portion connect, the setting portion passes the thrust ring set up in the tip of screw rod, non-return ring activity ground cover is located on the connecting portion, the nozzle passes through the nozzle flange set up in on the feed cylinder, its characterized in that: the diameter of the rod head part close to the connecting part is larger than that of the connecting part, the peripheral wall of the rod head part close to the connecting part is provided with a chamfer, the diameter of the rod head part is gradually reduced to be the same as that of the connecting part along the direction from the rod head part to the connecting part, the inner diameter of the non-return ring is smaller than the maximum diameter of the rod head part and is larger than that of the connecting part, the inner wall of the non-return ring close to the rod head part is provided with a chamfer, and the chamfer degree is equal to that of the peripheral wall of the connecting part close to the rod head part.