CN210590421U

CN210590421U - Injection molded structure of HDPE

Info

Publication number: CN210590421U
Application number: CN201921229657.XU
Authority: CN
Inventors: 陈昆强; 周利兵
Original assignee: Engel Machinery Shanghai Co Ltd
Current assignee: Engel Machinery Shanghai Co Ltd
Priority date: 2019-07-31
Filing date: 2019-07-31
Publication date: 2020-05-22
Anticipated expiration: 2029-07-31

Abstract

The utility model relates to an injection moulding structure of HDPE, including feed cylinder, the plastify screw rod that has the screw head and end contrary pad, end contrary pad installation in the step terminal surface between screw head pole portion rear end and laminating plastify screw rod and screw head pole portion, the cover is equipped with and ends contrary ring in the pole portion of screw head, it is 0.07 ~ 0.22mm to end contrary unilateral clearance between ring periphery and the feed cylinder inner wall. The utility model discloses to the plastify unit of standard, only need design the non-return ring of a structure can satisfy the requirement, even need change low viscosity, the plastic pellet that mobility is good is used for production, also only need simple change non-return ring, screw head and non-return pad, change the required time weak point to greatly improve the utilization ratio of machine.

Description

Injection molded structure of HDPE

Technical Field

The utility model relates to an injection moulding structure of HDPE.

Background

Extrusion-grade HDPE is a highly crystalline, non-polar thermoplastic resin with a melt flow rate of less than 0.1(190 ℃/2.16kg), high viscosity, and poor flow properties. Therefore, production on an injection molding machine is difficult to achieve. However, since the injection-molded products processed from the extrusion-grade HDPE have the advantages of light weight, high strength and low price, it is necessary to develop a corresponding plasticizing unit for injection-molding the extrusion-grade HDPE.

The non-return ring is a part for preventing melt from flowing back, the outer diameter (within the range of 55-150 mm) of the non-return ring and the annular gap of the charging barrel are generally (0.01-0.12) mm, the non-return ring is suitable for plastic melts with low viscosity and good fluidity, the non-return ring can play a role in sealing and cannot be clamped with the charging barrel, but the common gap design is only suitable for common plastics. To inject extrusion grade HDPE, the existing injection molded structure is: one is that the fork-shaped check ring is adopted, so that the screw is not blocked with the charging barrel and further wears the screw head (namely, the check ring and the screw head do not move relatively) when being plasticized, but because the annular gap is not optimized, the friction between the check ring and the charging barrel is still large, the charging barrel is easy to generate heat, the temperature is out of control, and further the product is scrapped; in the second mode, a non-return ring is not used, so that the problem of heat generation is solved, but the injection weight is unstable, and the yield of the product is reduced.

Disclosure of Invention

The to-be-solved technical problem of the utility model is: in order to overcome the deficiencies in the prior art, the utility model provides an injection moulding structure of HDPE to satisfy the requirement of realizing on the injection molding machine that the production extrudes level HDPE.

The utility model provides a technical scheme that its technical problem adopted is: the utility model provides an injection moulding structure of HDPE, includes the feed cylinder, has the plastify screw rod of screw head and ends contrary pad, ends contrary pad and installs in screw head pole portion rear end and the step terminal surface of laminating between plastify screw rod and the screw head pole portion, the cover is equipped with and ends contrary ring in the pole portion of screw head, it is 0.07 ~ 0.22mm to end unilateral clearance between ring periphery and the feed cylinder inner wall.

Preferably, a gap is formed between the inner hole of the check ring and the rod part of the screw head, the ratio of the area of the gap to the outer diameter of the check ring is 15-18, and the ratio of the length of the check ring to the outer diameter of the check ring is 0.5-0.8.

Furthermore, the non-return ring is provided with a notch or a bulge which meets the requirement of the ratio of the gap area to the outer diameter of the non-return ring.

The utility model has the advantages that: the utility model discloses to the plastify unit of standard, only need design the non-return ring of a structure can satisfy the requirement, even need change low viscosity, the plastic pellet that mobility is good is used for production, also only need simple change non-return ring, screw head and non-return pad, change the required time weak point to greatly improve the utilization ratio of machine.

Drawings

The present invention will be further described with reference to the accompanying drawings and embodiments.

Fig. 1 is a schematic structural diagram of the present invention.

In the figure: 1. the screw rod is connected with the plasticizing screw rod through a connecting rod, the charging barrel is 2, the screw rod head is 3, the plasticizing screw rod is 4, the non-return cushion is 5, and the non-return ring is 5.

Detailed Description

The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic drawings and illustrate the basic structure of the present invention only in a schematic manner, and thus show only the components related to the present invention.

As shown in fig. 1, an injection molding structure of HDPE comprises a material barrel 1, a plasticizing screw 3 with a screw head 2 and a non-return pad 4, wherein the non-return pad 4 is installed at the rear end of the rod part of the screw head 2 and is attached to the step end surface between the plasticizing screw 3 and the rod part of the screw head 2, the rod part of the screw head 2 is sleeved with a non-return ring 5, and the unilateral gap between the periphery of the non-return ring 5 and the inner wall of the material barrel 1 is 0.07-0.22 mm.

A gap is formed between the inner hole of the non-return ring 5 and the rod part of the screw head 2, the ratio of the area of the gap to the outer diameter of the non-return ring 5 is 15-18, and when the ratio is used, molten plastic can be ensured to rapidly pass through the gap between the non-return ring 5 and the screw head 2, so that the material accumulation phenomenon cannot occur; the ratio of the length of the non-return ring 5 to the outer diameter of the non-return ring 5 is 0.5-0.8, and within the value range, the non-return ring 5 can be ensured to move forwards and backwards smoothly during plasticizing and injection, so that the non-return ring 5 is not blocked, and the probability of friction between the non-return ring 5 and the material barrel 1 is reduced.

The non-return ring 5 is provided with corresponding notches or bulges so as to meet the requirement of the ratio of the gap area to the outer diameter of the non-return ring 5.

As the unilateral gap between the periphery of the non-return ring 5 and the inner wall of the charging barrel 1 is set to be 0.07-0.22 mm, the HDPE melt can push the non-return ring 5 to retreat and cling to the inclined plane of the non-return pad 4 during injection, thereby playing a better sealing role and effectively preventing the return leakage of the melt; when the plasticizing screw 3 is plasticized and retreated, the non-return ring 5 synchronously rotates along with the plasticizing screw 3, and the non-return ring 5 and the screw head 2 cannot be damaged. For the plastify unit of standard, the utility model discloses only need design the non-return ring 5 of a structure can, even need to change low viscosity, the plastic pellet that mobility is good is used for production, also only need simple change non-return ring 5, screw head 2 and non-return pad 4, change the required time weak point, the utilization ratio of the improvement machine that can be great.

In light of the foregoing, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims

1. The utility model provides an injection moulding structure of HDPE, includes feed cylinder (1), has plastify screw rod (3) of screw head (2) and ends contrary pad (4), ends contrary pad (4) and installs in the step terminal surface between screw head (2) pole portion rear end and laminating plastify screw rod (3) and screw head (2) pole portion, characterized by: the screw rod is characterized in that a rod part of the screw rod head (2) is sleeved with a non-return ring (5), and a single-side gap between the periphery of the non-return ring (5) and the inner wall of the charging barrel (1) is 0.07-0.22 mm.

2. An injection molded structure of HDPE as claimed in claim 1, characterized by: a gap is formed between the inner hole of the non-return ring (5) and the rod part of the screw head (2), the ratio of the area of the gap to the outer diameter of the non-return ring (5) is 15-18, and the ratio of the length of the non-return ring (5) to the outer diameter of the non-return ring (5) is 0.5-0.8.

3. An injection molded structure of HDPE as claimed in claim 2 characterized in that: the non-return ring (5) is provided with a notch or a bulge which meets the requirement of the ratio of the gap area to the outer diameter of the non-return ring (5).